CN219492406U - Electrolytic water hydrogen production energy storage peak regulation system coupled with gas power station - Google Patents

Abstract

The utility model provides an electrolytic water hydrogen production energy storage peak-shaving system coupled with a gas-fired power station, comprising: a combustion chamber, which is provided with a natural gas inlet, an air inlet, and a gas outlet; a gas turbine, whose inlet is connected to the gas outlet of the combustion chamber; machine, the input end is connected to the power output end of the gas turbine; the power generation end of the first generator is connected to the external transmission line; the water electrolysis cell has an electrolysis pole, a hydrogen outlet and an oxygen outlet; the electrolysis pole is selectively connected to the power generation end of the first generator Connection; hydrogen storage tank, with inlet and outlet; hydrogen storage tank inlet connected with hydrogen outlet of water electrolysis cell; fuel cell, with hydrogen inlet, flue gas outlet and power transmission end; fuel cell hydrogen inlet connected with hydrogen storage tank outlet; fuel The power transmission end of the battery is connected with the external transmission line; the flue gas outlet of the fuel cell is connected with the inlet of the gas turbine. It overcomes the shortcomings of the prior art energy storage peak-shaving system relying on gravity energy storage, which is limited by terrain and inconveniently coupled with gas-fired power stations.

Description

A peak-shaving system for hydrogen production by electrolysis coupled with a gas-fired power station

technical field

The utility model relates to the field of gas combined cycle, in particular to an electrolyzed water hydrogen production energy storage peak regulation system coupled with a gas power station.

Background technique

The current power generation system will face the alternating phenomenon of peak power consumption during the day and low power consumption at night, so there is a peak shaving problem. Therefore, an energy storage peak shaving system that can store energy during the trough period and release energy during the peak period has been developed. Generally, the energy storage methods of the energy storage peak shaving system include pumped water storage and heavy object energy storage. The principle is to use electricity to transfer the low-lying objects to the high-lying during the low-lying period, and release the gravitational potential energy during the peak period. Come generate electricity. This method is greatly restricted by terrain factors, and requires the energy storage system to be built in a reservoir or a high mountain, which is not conducive to the large-scale promotion and use of the energy storage peak-shaving system. Especially for gas-fired power stations, which mainly rely on burning natural gas to generate electricity, and the storage of natural gas has the characteristics of a large area and many safety-related prevention and control measures, its own address selection has many conditions, which is not conducive to cooperation with Gravity energy storage system is coupled.

Utility model content

Therefore, the technical problem to be solved by the utility model is to overcome the drawbacks of the prior art energy storage peak shaving system relying on gravity energy storage which is limited by terrain and inconvenient to be coupled with a gas-fired power station.

In order to solve the above technical problems, this application provides an electrolysis water hydrogen production energy storage peak-shaving system coupled with a gas-fired power station, including:

The combustion chamber is provided with a natural gas inlet, an air inlet and a gas outlet;

Gas turbine, the inlet is connected to the gas outlet of the combustor;

The first generator, the input end is connected to the power output end of the gas turbine; the power generation end of the first generator is connected to the external transmission line;

The water electrolysis cell has an electrolysis pole, a hydrogen outlet and an oxygen outlet; the electrolysis pole is selectively connected to the power generation end of the first generator;

The hydrogen storage tank has an inlet and an outlet; the inlet of the hydrogen storage tank is connected with the hydrogen gas outlet of the water electrolysis cell;

The fuel cell has a hydrogen inlet, a flue gas outlet and a power transmission end; the hydrogen gas inlet of the fuel cell is connected to the hydrogen storage tank outlet; the power transmission end of the fuel cell is connected to an external transmission line; the flue gas outlet of the fuel cell is connected to the gas turbine inlet.

Optionally, a post-combustion chamber is provided between the fuel cell flue gas outlet and the gas turbine inlet.

Optionally, also include:

The waste heat boiler has a flue gas channel and a steam outlet, and is used to exchange heat for the flue gas in the flue gas channel to generate steam;

Steam turbine, the inlet is connected to the steam outlet of the waste heat boiler;

The input end of the second generator is connected to the power output end of the steam turbine; the power generation end of the second generator is connected to the external transmission line.

Optionally, the power generation end of the second generator is selectively connected to the electrolysis pole of the water electrolysis cell.

Optionally, a condenser is also included, the inlet of the condenser is connected with the outlet of the steam turbine; the waste heat boiler has a water return port, and the outlet of the condenser is connected with the return water port of the waste heat boiler.

Optionally, it also includes a regenerator, the regenerator has a gas channel and a liquid channel, and is suitable for heat exchange between the gas channel and the liquid channel; the inlet of the liquid channel of the regenerator is connected with the outlet of the condenser; the regenerator The outlet of the liquid channel of the heater is connected with the water return port of the waste heat boiler; the inlet of the gas channel of the regenerator is connected with the outlet of the steam turbine; the outlet of the gas channel of the regenerator is connected with the inlet of the condenser.

Optionally, a deaerator is also included; the deaerator has a hot gas inlet, a water inlet and a water outlet; the hot gas inlet of the deaerator is connected to the outlet of the steam turbine; the water inlet of the deaerator is connected to the liquid passage outlet of the regenerator; the deaerator The water outlet of the device is connected to the return water port of the waste heat boiler.

Optionally, a condensate pump is arranged between the outlet of the gas channel of the regenerator and the inlet of the condenser.

Optionally, a circulating water pump is provided between the water outlet of the deaerator and the return water port of the waste heat boiler.

Optionally, an air compressor is provided at the air inlet of the combustion chamber.

By adopting the above technical scheme, the utility model has the following technical effects:

The electrolytic water hydrogen production energy storage peak-shaving system coupled with the gas-fired power station provided by the utility model adopts the chemical energy storage method of electrolytic water hydrogen production, so it gets rid of the restriction that the gravity energy storage needs to rely on the terrain, so that the gas The location of the power station is flexible; and although hydrogen as a flammable gas has certain safety risks in use, gas-fired power stations, as a large user of natural gas, have a sound and complete risk management and control system and capability for flammable gases, so it is necessary to increase the use of hydrogen The hardware cost and management cost brought about will not be too high, and it has comprehensive advantages compared with other types of power stations. And as long as the fuel cell has continuous input of fuel and oxidant (pure oxygen or air), it can continuously generate electric energy. Therefore, the fuel cell has the characteristics of both a battery and a heat engine, and has high energy conversion efficiency, no environmental pollutant emissions, and low temperature. Features such as fast start-up, low vibration and noise levels. When the fuel cell uses pure hydrogen as fuel, its chemical reaction product is only water, which fundamentally eliminates the emission of CO, NOx, SOx, dust and other air pollutants, and can achieve zero emission. At the same time, it is clean, reliable, mobile, Long life and other advantages. In addition, because the fuel cell has the characteristics of a heat engine, it can generate high-temperature flue gas of nearly 1,000 degrees after the reaction, and introducing this part of the flue gas into the gas turbine can increase the output of the gas turbine and reduce the consumption of natural gas, thus making full use of the chemical energy during energy release. It improves the energy storage and release conversion rate of the system as a whole, making the whole system more flexible to ensure the balance of power supply and demand, and has important energy-saving potential and development significance.

Description of drawings

In order to more clearly illustrate the specific implementation of the utility model or the technical solutions in the prior art, the accompanying drawings that need to be used in the description of the specific implementation or the prior art will be briefly introduced below. Obviously, the following descriptions The accompanying drawings are some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without any creative effort.

Fig. 1 is a schematic structural view of an embodiment of the utility model.

Explanation of reference signs:

1-water electrolysis cell; 2-hydrogen storage tank; 3-fuel cell; 4-combustion chamber; 5-compressor; 6-combustion chamber; 7-gas turbine; 8-first generator; - steam turbine; 11 - second generator; 12 - condenser; 13 - condensate pump; 14 - regenerator; 15 - deaerator; 16 - circulating water pump.

Detailed ways

The technical solutions of the utility model will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are part of the embodiments of the utility model, not all of them. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

What needs to be explained in the description of the present utility model is that the coordinate system used in this manual to describe the orientation is determined by the attitude of the loading and unloading bar in the state of elevated use, and the viewing angle of the corresponding view is also named based on this , so the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner" and "outer" in this specification is Based on the orientation or positional relationship shown in the drawings, it is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot It should be understood as a limitation of the present utility model.

In the description of the present utility model, it should be noted that, unless otherwise clearly stipulated and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a flexible connection. Detachable connection, or integral connection; it can be mechanical connection or electrical connection; it can be direct connection or indirect connection through an intermediary, and it can be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present utility model in specific situations.

In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not constitute conflicts with each other.

This embodiment provides an electrolyzed water hydrogen production energy storage peak-shaving system coupled with a gas-fired power station.

In one embodiment, as shown in FIG. 1 , it includes: a combustion chamber 6 , a gas turbine 7 , a first generator 8 , a water electrolysis cell 1 , a hydrogen storage tank 2 and a fuel cell 3 . The combustion chamber 6 is a device for burning natural gas to generate gas, which is provided with a natural gas inlet, an air inlet and a gas outlet. The gas turbine 7 is a device that converts gas pressure into power, and its inlet is connected with the gas outlet of the combustion chamber 6 . The input end of the first generator 8 is connected with the power output end of the gas turbine 7 . The power generation end of the first generator 8 is connected to the external transmission line for external transmission of electric power. The water electrolysis cell 1 can electrolyze water by electric power, and has an electrolysis electrode, a hydrogen outlet and an oxygen outlet. The oxygen outlet can be connected with oxygen dispensing equipment, so as to facilitate external sale of oxygen for industrial or medical purposes. The electrolytic electrode is selectively connected to the power generation end of the first generator 8 according to the peak and valley conditions. It is turned on for energy storage when the power consumption is low, and it is disconnected during the peak power consumption to increase the power generation capacity of the first generator 8. All external output. The hydrogen storage tank 2 is a device for generating hydrogen after storing electrolyzed water, and has an inlet and an outlet. The inlet of the hydrogen storage tank 2 is connected with the hydrogen outlet of the water electrolysis cell 1 . The fuel cell 3 is a power generation device that directly converts the chemical energy in the fuel into electrical energy through an electrochemical reaction, and has a hydrogen inlet, a flue gas outlet and a power transmission terminal. The hydrogen inlet of the fuel cell 3 is connected to the outlet of the hydrogen storage tank 2; the power transmission end of the fuel cell 3 is connected to the external transmission line; the flue gas outlet of the fuel cell 3 is connected to the inlet of the gas turbine 7.

When the energy storage peak shaving system is in use, the water electrolysis cell 1 and the first generator 8 are connected when the power consumption is low, so that part of the power generated by the first generator 8 is used to electrolyze water to generate hydrogen and oxygen. The hydrogen generated by the electrolysis of water is stored in the hydrogen storage tank 2, thereby storing electrical energy in the form of chemical energy. When electricity consumption peaks, the connection between the water electrolysis cell 1 and the first generator 8 is disconnected, and hydrogen is input from the hydrogen storage tank 2 into the fuel cell 3 to generate electricity for making up for the first generator 8. Power generation, so that the power supply of the whole system can be increased to meet the demand of peak power consumption.

Because the energy storage peak shaving system adopts the chemical energy storage method of electrolyzing water to produce hydrogen, it gets rid of the limitation that gravity energy storage needs to rely on terrain, so that the site selection of gas-fired power stations is flexible; and although hydrogen is a flammable gas There are certain safety risks in use, but as a large user of natural gas, gas-fired power stations have a sound and complete risk management and control system and capabilities for combustible gases, so the hardware costs and management costs caused by the increased use of hydrogen will not be too high. It has comprehensive advantages over other types of power stations. And as long as the fuel cell has continuous input of fuel and oxidant (pure oxygen or air), it can continuously generate electric energy. Therefore, the fuel cell has the characteristics of both a battery and a heat engine, and has high energy conversion efficiency, no environmental pollutant emissions, and low temperature. Features such as fast start-up, low vibration and noise levels. When the fuel cell uses pure hydrogen as fuel, its chemical reaction product is only water, which fundamentally eliminates the emission of CO, NOx, SOx, dust and other air pollutants, and can achieve zero emissions. At the same time, it is clean, reliable, mobile, Long life and other advantages. In addition, because the fuel cell 3 has the characteristics of a heat engine, it can generate high-temperature flue gas of nearly 1,000 degrees after the reaction, and introducing this part of flue gas into the gas turbine 7 can increase the output of the gas turbine 7 and reduce the consumption of natural gas, thereby making full use of the released energy. The chemical energy at the time improves the energy storage and release energy conversion rate of the system as a whole, making the whole system more flexible to ensure the balance of power supply and demand, which has important energy-saving potential and development significance.

Based on the above embodiments, in a preferred embodiment, as shown in FIG. 1 , a post-combustion chamber 4 is provided between the outlet of the fuel cell 3 and the inlet of the gas turbine 7 . The supplementary combustion chamber 4 can carry out supplementary combustion of the residual hydrogen in the flue gas after the reaction of the fuel cell 3, increasing the heat energy of the flue gas after the reaction, so as to increase the output of the subsequent gas turbine 7, thereby improving the energy utilization rate of the system.

Based on the above embodiments, in a preferred embodiment, as shown in FIG. 1 , a compressor 5 is provided at the air inlet of the combustion chamber 6 . The compressor 5 may be coaxial with the gas turbine 7 . Adding the compressor 5 can increase the oxygen content in the unit volume of the combustion chamber 6, thereby increasing the output power of the whole machine.

Based on the above embodiments, in a preferred embodiment, as shown in FIG. 1 , it further includes: a waste heat boiler 9 , a steam turbine 10 and a second generator 11 . The waste heat boiler 9 is a heat exchange device, which has a flue gas channel and a steam outlet, and can be used to exchange heat for the flue gas in the flue gas channel, and then heat the water in it to generate steam. The steam turbine 10 is a device for converting steam pressure into power, and its inlet is connected with the steam outlet of the waste heat boiler 9 . The input end of the second generator 11 is connected to the power output end of the steam turbine 10; the power generation end of the second generator 11 is connected to the external transmission line.

After the above settings, the exhaust gas discharged from the gas turbine 7 can be reused, the heat contained in the exhaust gas can be recovered through the waste heat boiler 9, and then the steam power generation equipment can be used to generate electricity, thereby improving the energy utilization efficiency of the entire system.

Based on the above embodiments, in a preferred embodiment, as shown in FIG. 1 , the power generation end of the second generator 11 is selectively connected to the electrolytic pole of the water electrolysis cell 1 . This setting is similar to the first generator 8 that relies on gas to generate electricity, so that the power of the second generator 11 can be stored by electrolyzing water to produce hydrogen, which improves the power storage capacity of the entire system.

Based on the above embodiment, in a preferred embodiment, as shown in Figure 1, it also includes a condenser 12, the inlet of the condenser 12 is connected to the outlet of the steam turbine 10; the waste heat boiler 9 has a water return port, and the condenser 12 The outlet is connected to the water return port 9 of the waste heat boiler. After this setting, the water cycle of steam power generation equipment is formed, which greatly reduces the water consumption of steam power generation equipment, so that steam power generation equipment, which is a large water user, obtains a high water resource utilization rate and reduces the demand for related water supply equipment. Protect the balance of the local hydrological environment.

Based on the above embodiment, in a preferred embodiment, as shown in Figure 1, it also includes a regenerator 14, the regenerator 14 has a gas channel and a liquid channel, and is suitable for the gas channel and the liquid channel Heat exchange between the liquid channels; the inlet of the liquid channel of the regenerator 14 is connected to the outlet of the condenser 12; the outlet of the liquid channel of the regenerator 14 is connected to the water return port of the waste heat boiler 9; the inlet of the gas channel of the regenerator 14 is connected to the outlet of the steam turbine 10 ; The regenerator 14 gas channel outlet is connected to the condenser 12 inlet.

Adding the regenerator 14 can recover the heat energy carried by the exhaust gas discharged from the steam turbine 10, so that the exhaust gas of the steam turbine 10 can preheat the return water that is about to enter the waste heat boiler 9 through the regenerator 14, thereby reducing the heat generated by the waste heat boiler 9. The heat required by the steam improves the energy efficiency of the entire system.

Based on the foregoing embodiment, in a preferred embodiment, as shown in Figure 1, it also includes a deaerator 15; the deaerator 15 has a hot gas inlet, a water inlet and a water outlet; the deaerator 15 hot gas inlet It is connected with the outlet of the steam turbine 10; the water inlet of the deaerator 15 is connected with the outlet of the liquid channel of the regenerator 14; the water outlet of the deaerator 15 is connected with the water return port of the waste heat boiler 9. The addition of a deaerator can remove oxygen and other corrosive substances in the boiler water. It uses the heat of exhaust gas discharged from the steam turbine 10 to evaporate the water, so that only water vapor exists on the water surface in it, and the partial pressure of other gases is reduced. , which in turn promotes the discharge of oxygen and other gases contained in the water, removes harmful substances in the boiler water, and ultimately prolongs the service life of equipment and pipelines.

Based on the above embodiments, in a preferred embodiment, as shown in FIG. 1 , a condensate pump 13 is provided between the outlet of the gas channel of the regenerator 14 and the inlet of the condenser 12 . In this way, the flow of condensed water can be promoted, and there is no need to consider the level difference between the condenser 12 and the regenerator 14 to form the water flow.

Based on the above embodiment, in a preferred embodiment, as shown in Figure 1, a circulating water pump 16 is provided between the water outlet of the deaerator 15 and the water return port of the waste heat boiler 9, so as to promote the flow of circulating water, Make the waste heat boiler 9 replenish water in time.

Apparently, the above-mentioned embodiments are only examples for clear description, rather than limiting the implementation. For those of ordinary skill in the art, other changes or changes in different forms can be made on the basis of the above description. It is not necessary and impossible to exhaustively list all the implementation manners here. And the obvious changes or variations derived therefrom are still within the scope of protection of the utility model.

Claims (10)

1. An electrolytic water hydrogen production energy storage peak shaving system coupled with a gas power station, which is characterized by comprising:

a combustion chamber (6) provided with a natural gas inlet, an air inlet and a gas outlet;

a gas turbine (7), the inlet of which is connected with the gas outlet of the combustion chamber (6);

the input end of the first generator (8) is connected with the power output end of the gas turbine (7); the power generation end of the first power generator (8) is connected with an output line;

a water electrolysis cell (1) having an electrolysis electrode, a hydrogen outlet and an oxygen outlet; the electrolytic pole is selectively connected with the power generation end of the first power generator (8);

a hydrogen storage tank (2) having an inlet and an outlet; an inlet of the hydrogen storage tank (2) is connected with a hydrogen outlet of the water electrolytic cell (1);

a fuel cell (3) having a hydrogen inlet, a flue gas outlet and a power transmission end; the hydrogen inlet of the fuel cell (3) is connected with the outlet of the hydrogen storage tank (2); the power transmission end of the fuel cell (3) is connected with an external transmission line;

the flue gas outlet of the fuel cell (3) is connected with the inlet of the gas turbine (7).

2. The electrolytic water hydrogen production energy storage peak shaver system coupled with a gas power station according to claim 1, wherein an afterburner (4) is arranged between the flue gas outlet of the fuel cell (3) and the inlet of the gas turbine (7).

3. The water electrolysis hydrogen production energy storage peak shaver system coupled to a gas power station according to claim 1, further comprising:

the waste heat boiler (9) is provided with a flue gas channel and a steam outlet and is used for carrying out heat exchange on flue gas in the flue gas channel to generate steam;

a steam turbine (10), the inlet of which is connected with the steam outlet of the waste heat boiler (9);

the input end of the second generator (11) is connected with the power output end of the steam turbine (10); the power generating end of the second generator (11) is connected with the output line.

4. A water electrolysis hydrogen production energy storage peak shaver system coupled with a gas power station according to claim 3, wherein the generating end of the second generator (11) is selectively connected with the electrolyte of the water electrolysis cell (1).

5. The electrolytic water to hydrogen production energy storage peak shaver system coupled with a gas power station according to claim 3, further comprising a condenser (12), wherein an inlet of the condenser (12) is connected with an outlet of the steam turbine (10); the waste heat boiler (9) is provided with a water return port, and the outlet of the condenser (12) is connected with the water return port of the waste heat boiler (9).

6. The electrolyzed water hydrogen production energy storage peak shaver system coupled to a gas power station according to claim 5, further comprising a regenerator (14), the regenerator (14) having a gas channel and a liquid channel and being adapted to exchange heat between the gas channel and the liquid channel; the inlet of the liquid channel of the heat regenerator (14) is connected with the outlet of the condenser (12); the outlet of the liquid channel of the heat regenerator (14) is connected with a water return port of the waste heat boiler (9); the inlet of the gas channel of the heat regenerator (14) is connected with the outlet of the steam turbine (10); the outlet of the gas channel of the heat regenerator (14) is connected with the inlet of the condenser (12).

7. The electrolytic water to hydrogen production, energy storage and peak shaving system coupled to a gas power station of claim 6, further comprising a deaerator (15); the deaerator (15) has a hot gas inlet, a water inlet and a water outlet; the hot gas inlet of the deaerator (15) is connected with the outlet of the steam turbine (10); the water inlet of the deaerator (15) is connected with the outlet of the liquid channel of the heat regenerator (14); the water outlet of the deaerator (15) is connected with the water return port of the waste heat boiler (9).

8. The electrolytic water hydrogen production energy storage peak shaver system coupled with a gas power station according to claim 6, wherein a condensate pump (13) is arranged between the outlet of the gas channel of the regenerator (14) and the inlet of the condenser (12).

9. The electrolytic water hydrogen production energy storage peak shaving system coupled with the gas power station as claimed in claim 7, wherein a circulating water pump (16) is arranged between the water outlet of the deaerator (15) and the water return port of the waste heat boiler (9).

10. The electrolytic water hydrogen production energy storage peak shaver system coupled with a gas power station according to claim 1, wherein a compressor (5) is arranged at an air inlet of the combustion chamber (6).