The Experts below are selected from a list of 75 Experts worldwide ranked by ideXlab platform

Yan Yizhou - One of the best experts on this subject based on the ideXlab platform.

  • Transient analyses of AC600 passive residual heat removal system using RELAP5
    Journal of Tsinghua University, 2002
    Co-Authors: Yan Yizhou
    Abstract:

    The transient behavior of the AC600 passive residual heat removal system (PRHR) was analyzed using RELAP5. A wall air heat transter correlation was added to the RELAP5 code. The modified code was then used to simulate the AC600 nuclear power plant with passive residual heat removal in emergency Feed Water Tank (EFWT) start up mode during blackout accident. The results show that increasing the chimney height or the height difference between the steam generator and the air cooler increases the PRHR system heat removal capacity. The results are consistent with theoretical analysis.

Jan Taler - One of the best experts on this subject based on the ideXlab platform.

  • The use of pressure hot Water storage Tanks to improve the energy flexibility of the steam power unit
    Energy, 2019
    Co-Authors: Marcin Trojan, Piotr Dzierwa, Dawid Taler, Jan Taler, Karol Kaczmarski, Jan Wrona
    Abstract:

    Abstract Existing thermal power plants must be adapted to cooperate with wind farms and other renewable energy sources by improving their flexibility. The paper analyzes the improvement of the 200MWe block's flexibility by installing hot Water storage Tanks. The maximum increase in the block output resulting from the shut-off of low-pressure steam bleeds is calculated. During this period, the hot Water from Water storage Tanks is supplied to the boiler. Hot Water is accumulated in pressure Water Tanks during the low-load period of the unit. Water with design temperature in the Feed Water Tank flows into the Water pressure Tanks to reduce the electric power of the unit in the off-peak night hours. The hot Water accumulated during the night in storage Tanks is used to Feed the boiler during the period of peak demand for electricity. The reduction in the block electric power was calculated for various volumes and charging periods of the Water storage Tanks. A cost analysis was carried out to demonstrate the economic profitability of installation of pressure Water accumulators. It is worth mentioning that hot Water Tanks may also be applied to fill the boiler evaporator with hot Water before the start-up of the power unit from the cold state.

  • Improving flexibility characteristics of 200 MW unit
    Archives of Thermodynamics, 2017
    Co-Authors: Jan Taler, Piotr Dzierwa, Dawid Taler, Marcin Trojan, Karol Kaczmarski
    Abstract:

    Abstract Calculations were performed of the thermal system of a power plant with installed Water pressure Tanks. The maximum rise in the block electric power resulting from the shut-off of low-pressure regenerative heaters is determined. At that time, the boiler is fed with hot Water from Water pressure Tanks acting as heat accumulators. Accumulation of hot Water in Water Tanks is also proposed in the periods of the power unit small load. In order to lower the plant electric power in the off-peak night hours, Water heated in low-pressure regenerative heaters and Feed Water Tank to the nominal temperature is directed to Water pressure Tanks. The Water accumulated during the night is used to Feed the boiler during the period of peak demand for electricity. Drops in the power block electric power were determined for different capacities of the Tanks and periods when they are charged. A financial and economic profitability analysis (of costs and benefits) is made of the use of Tanks for a 200 MW power unit. Operating in the automatic system of frequency and power control, the Tanks may also be used to ensure a sudden increase in the electric power of the unit. The results of the performed calculations and analyses indicate that installation of Water pressure Tanks is well justified. The investment is profitable. Water pressure Tanks may not only be used to reduce the power unit power during the off-peak night hours and raise it in the periods of peak demand, but also to increase the power capacity fast at any time. They may also be used to fill the boiler evaporator with hot Water during the power unit start-up from the cold state.

  • Shortening start-up and an extension of the power unit load range
    E3S Web of Conferences, 2017
    Co-Authors: Jan Taler, Piotr Dzierwa, Dawid Taler, Marcin Trojan, Karol Kaczmarski
    Abstract:

    A power plant with additional Water pressure Tanks was proposed. The maximum rise in the block electric power resulting from the shut-off of low-pressure regenerative heaters was determined. At that time, the boiler is fed with hot Water from Water pressure Tanks acting as heat accumulators. Accumulation of hot Water in Water Tanks is also proposed in the periods of the power unit small load. In order to lower the plant electric power in the off-peak night hours, Water heated to the nominal temperature in low-pressure regenerative heaters is directed from the Feed Water Tank to pressure Tanks. The Water accumulated during the night is used to Feed the boiler during the period of peak demand for electricity. Pressure accumulators are proposed to be used for the rapid start-up of the boiler from a cold state. The evaporator of the boiler is filled at the beginning of start-up with hot Water from the accumulators. Drops in the power block electric power were determined for different capacities of the Tanks and periods when they are charged. The Tanks may also be used to ensure a sudden increase in the electric power of the unit that is operating in the automatic system of frequency and power control (in Polish: ARCM).

  • Evaporator Heating with Optimum Fluid Temperature Changes
    Procedia Engineering, 2016
    Co-Authors: Piotr Dzierwa, Dawid Taler, Marcin Trojan, Jan Taler
    Abstract:

    Abstract In order to speed up the boiler start-up, especially from the cold state, the boiler evaporator may be flooded with hot Water at the beginning of the process. The temperature of Water supplied to the boiler evaporator through lower chambers of the boiler furnace chamber Waterwalls will be found from the condition of equality between allowable stresses and circumferential thermal stresses on the edge of the opening for the downcomer. Two mathematical models of the evaporator hot-Water heating are presented in this paper – one with lumped and the other with distributed parameters. In both cases, the Water level is identical. The hot Water needed to fill the boiler evaporator may be supplied from the Feed Water Tank of another operating boiler or from a hot Water vessel.

Karol Kaczmarski - One of the best experts on this subject based on the ideXlab platform.

  • The use of pressure hot Water storage Tanks to improve the energy flexibility of the steam power unit
    Energy, 2019
    Co-Authors: Marcin Trojan, Piotr Dzierwa, Dawid Taler, Jan Taler, Karol Kaczmarski, Jan Wrona
    Abstract:

    Abstract Existing thermal power plants must be adapted to cooperate with wind farms and other renewable energy sources by improving their flexibility. The paper analyzes the improvement of the 200MWe block's flexibility by installing hot Water storage Tanks. The maximum increase in the block output resulting from the shut-off of low-pressure steam bleeds is calculated. During this period, the hot Water from Water storage Tanks is supplied to the boiler. Hot Water is accumulated in pressure Water Tanks during the low-load period of the unit. Water with design temperature in the Feed Water Tank flows into the Water pressure Tanks to reduce the electric power of the unit in the off-peak night hours. The hot Water accumulated during the night in storage Tanks is used to Feed the boiler during the period of peak demand for electricity. The reduction in the block electric power was calculated for various volumes and charging periods of the Water storage Tanks. A cost analysis was carried out to demonstrate the economic profitability of installation of pressure Water accumulators. It is worth mentioning that hot Water Tanks may also be applied to fill the boiler evaporator with hot Water before the start-up of the power unit from the cold state.

  • Improving flexibility characteristics of 200 MW unit
    Archives of Thermodynamics, 2017
    Co-Authors: Jan Taler, Piotr Dzierwa, Dawid Taler, Marcin Trojan, Karol Kaczmarski
    Abstract:

    Abstract Calculations were performed of the thermal system of a power plant with installed Water pressure Tanks. The maximum rise in the block electric power resulting from the shut-off of low-pressure regenerative heaters is determined. At that time, the boiler is fed with hot Water from Water pressure Tanks acting as heat accumulators. Accumulation of hot Water in Water Tanks is also proposed in the periods of the power unit small load. In order to lower the plant electric power in the off-peak night hours, Water heated in low-pressure regenerative heaters and Feed Water Tank to the nominal temperature is directed to Water pressure Tanks. The Water accumulated during the night is used to Feed the boiler during the period of peak demand for electricity. Drops in the power block electric power were determined for different capacities of the Tanks and periods when they are charged. A financial and economic profitability analysis (of costs and benefits) is made of the use of Tanks for a 200 MW power unit. Operating in the automatic system of frequency and power control, the Tanks may also be used to ensure a sudden increase in the electric power of the unit. The results of the performed calculations and analyses indicate that installation of Water pressure Tanks is well justified. The investment is profitable. Water pressure Tanks may not only be used to reduce the power unit power during the off-peak night hours and raise it in the periods of peak demand, but also to increase the power capacity fast at any time. They may also be used to fill the boiler evaporator with hot Water during the power unit start-up from the cold state.

  • Shortening start-up and an extension of the power unit load range
    E3S Web of Conferences, 2017
    Co-Authors: Jan Taler, Piotr Dzierwa, Dawid Taler, Marcin Trojan, Karol Kaczmarski
    Abstract:

    A power plant with additional Water pressure Tanks was proposed. The maximum rise in the block electric power resulting from the shut-off of low-pressure regenerative heaters was determined. At that time, the boiler is fed with hot Water from Water pressure Tanks acting as heat accumulators. Accumulation of hot Water in Water Tanks is also proposed in the periods of the power unit small load. In order to lower the plant electric power in the off-peak night hours, Water heated to the nominal temperature in low-pressure regenerative heaters is directed from the Feed Water Tank to pressure Tanks. The Water accumulated during the night is used to Feed the boiler during the period of peak demand for electricity. Pressure accumulators are proposed to be used for the rapid start-up of the boiler from a cold state. The evaporator of the boiler is filled at the beginning of start-up with hot Water from the accumulators. Drops in the power block electric power were determined for different capacities of the Tanks and periods when they are charged. The Tanks may also be used to ensure a sudden increase in the electric power of the unit that is operating in the automatic system of frequency and power control (in Polish: ARCM).

Dan Fa - One of the best experts on this subject based on the ideXlab platform.

  • Design of a natural draft air-cooled condenser and its heat transfer characteristics in the passive residual heat removal system for 10 MW molten salt reactor experiment
    Applied Thermal Engineering, 2015
    Co-Authors: Hangbin Zhao, Kaibin Zhao, Dan Fa
    Abstract:

    Abstract As one of the Generation IV reactors, Molten Salt Reactor (MSR) has its superiorities in satisfying the requirements on safety. In order to improve its inherent safety, a concept of passive residual heat removal system (PRHRS) for the 10 MW Molten Salt Reactor Experiment (MSRE) was put forward, which mainly consisted of a fuel drain Tank, a Feed Water Tank and a natural draft air-cooled condenser (NDACC). Besides, several valves and pipes are also included in the PRHRS. A NDACC for the PRHRS was preliminarily designed in this paper, which contained a finned tube bundle and a chimney. The tube bundle was installed at the bottom of the chimney for increasing the velocity of the air across the bundle. The heat transfer characteristics of the NDACC were investigated by developing a model of the PRHRS using C++ code. The effects of the environmental temperature, finned tube number and chimney height on heat removal capacity of the NDACC were analyzed. The results show that it has sufficient heat removal capacity to meet the requirements of the residual heat removal for MSRE. The effects of these three factors are obvious. With the decay heat reducing, the heat dissipation power declines after a short-time rise in the beginning. The operation of the NDACC is completely automatic without the need of any external power, resulting in a high safety and reliability of the reactor, especially once the accident of power lost occurs to the power plant.

Marcin Trojan - One of the best experts on this subject based on the ideXlab platform.

  • The use of pressure hot Water storage Tanks to improve the energy flexibility of the steam power unit
    Energy, 2019
    Co-Authors: Marcin Trojan, Piotr Dzierwa, Dawid Taler, Jan Taler, Karol Kaczmarski, Jan Wrona
    Abstract:

    Abstract Existing thermal power plants must be adapted to cooperate with wind farms and other renewable energy sources by improving their flexibility. The paper analyzes the improvement of the 200MWe block's flexibility by installing hot Water storage Tanks. The maximum increase in the block output resulting from the shut-off of low-pressure steam bleeds is calculated. During this period, the hot Water from Water storage Tanks is supplied to the boiler. Hot Water is accumulated in pressure Water Tanks during the low-load period of the unit. Water with design temperature in the Feed Water Tank flows into the Water pressure Tanks to reduce the electric power of the unit in the off-peak night hours. The hot Water accumulated during the night in storage Tanks is used to Feed the boiler during the period of peak demand for electricity. The reduction in the block electric power was calculated for various volumes and charging periods of the Water storage Tanks. A cost analysis was carried out to demonstrate the economic profitability of installation of pressure Water accumulators. It is worth mentioning that hot Water Tanks may also be applied to fill the boiler evaporator with hot Water before the start-up of the power unit from the cold state.

  • Improving flexibility characteristics of 200 MW unit
    Archives of Thermodynamics, 2017
    Co-Authors: Jan Taler, Piotr Dzierwa, Dawid Taler, Marcin Trojan, Karol Kaczmarski
    Abstract:

    Abstract Calculations were performed of the thermal system of a power plant with installed Water pressure Tanks. The maximum rise in the block electric power resulting from the shut-off of low-pressure regenerative heaters is determined. At that time, the boiler is fed with hot Water from Water pressure Tanks acting as heat accumulators. Accumulation of hot Water in Water Tanks is also proposed in the periods of the power unit small load. In order to lower the plant electric power in the off-peak night hours, Water heated in low-pressure regenerative heaters and Feed Water Tank to the nominal temperature is directed to Water pressure Tanks. The Water accumulated during the night is used to Feed the boiler during the period of peak demand for electricity. Drops in the power block electric power were determined for different capacities of the Tanks and periods when they are charged. A financial and economic profitability analysis (of costs and benefits) is made of the use of Tanks for a 200 MW power unit. Operating in the automatic system of frequency and power control, the Tanks may also be used to ensure a sudden increase in the electric power of the unit. The results of the performed calculations and analyses indicate that installation of Water pressure Tanks is well justified. The investment is profitable. Water pressure Tanks may not only be used to reduce the power unit power during the off-peak night hours and raise it in the periods of peak demand, but also to increase the power capacity fast at any time. They may also be used to fill the boiler evaporator with hot Water during the power unit start-up from the cold state.

  • Shortening start-up and an extension of the power unit load range
    E3S Web of Conferences, 2017
    Co-Authors: Jan Taler, Piotr Dzierwa, Dawid Taler, Marcin Trojan, Karol Kaczmarski
    Abstract:

    A power plant with additional Water pressure Tanks was proposed. The maximum rise in the block electric power resulting from the shut-off of low-pressure regenerative heaters was determined. At that time, the boiler is fed with hot Water from Water pressure Tanks acting as heat accumulators. Accumulation of hot Water in Water Tanks is also proposed in the periods of the power unit small load. In order to lower the plant electric power in the off-peak night hours, Water heated to the nominal temperature in low-pressure regenerative heaters is directed from the Feed Water Tank to pressure Tanks. The Water accumulated during the night is used to Feed the boiler during the period of peak demand for electricity. Pressure accumulators are proposed to be used for the rapid start-up of the boiler from a cold state. The evaporator of the boiler is filled at the beginning of start-up with hot Water from the accumulators. Drops in the power block electric power were determined for different capacities of the Tanks and periods when they are charged. The Tanks may also be used to ensure a sudden increase in the electric power of the unit that is operating in the automatic system of frequency and power control (in Polish: ARCM).

  • Evaporator Heating with Optimum Fluid Temperature Changes
    Procedia Engineering, 2016
    Co-Authors: Piotr Dzierwa, Dawid Taler, Marcin Trojan, Jan Taler
    Abstract:

    Abstract In order to speed up the boiler start-up, especially from the cold state, the boiler evaporator may be flooded with hot Water at the beginning of the process. The temperature of Water supplied to the boiler evaporator through lower chambers of the boiler furnace chamber Waterwalls will be found from the condition of equality between allowable stresses and circumferential thermal stresses on the edge of the opening for the downcomer. Two mathematical models of the evaporator hot-Water heating are presented in this paper – one with lumped and the other with distributed parameters. In both cases, the Water level is identical. The hot Water needed to fill the boiler evaporator may be supplied from the Feed Water Tank of another operating boiler or from a hot Water vessel.