阅读说明：本技术 一种基于电解水制氢的火电厂调峰系统 (Thermal power plant peak regulation system based on hydrogen production by water electrolysis ) 是由 王晓鑫 刘泽涛 刘赟 王旭 于 2019-10-12 设计创作，主要内容包括：本发明公开了一种基于电解水制氢的火电厂调峰系统,包括燃煤锅炉、置于所述燃煤锅炉工艺上游的制氢机组、置于所述燃煤锅炉工艺下游的烟气回收机组；所述制氢机组包括多台氢气储罐；多台所述氢气储罐相互并联,且多台所述氢气储罐均通过管路与所述电解水制氢设备连通以接收并储存氢气；所述制氢机组通过管路连通有缓冲罐,所述缓冲罐位于所述氢气储罐的工艺下游；该制氢机组安装有阀组,所述氢气储罐通过阀组切换连通状态。本发明的系统配设了多台氢气储罐以及与多台氢气储罐串联连通的缓冲罐,多台氢气储罐能够实现多开多备的效果,方便后期检修,而缓冲罐能够进一步对开启的氢气储罐输出的氢气进行稳压输送,提高安全性。(The invention discloses a thermal power plant peak regulation system based on hydrogen production by water electrolysis, which comprises a coal-fired boiler, a hydrogen production unit arranged at the upstream of the coal-fired boiler process, and a flue gas recovery unit arranged at the downstream of the coal-fired boiler process; the hydrogen production unit comprises a plurality of hydrogen storage tanks; the hydrogen storage tanks are connected in parallel, and are communicated with the water electrolysis hydrogen production equipment through pipelines to receive and store hydrogen; the hydrogen production unit is communicated with a buffer tank through a pipeline, and the buffer tank is positioned at the process downstream of the hydrogen storage tank; the hydrogen production unit is provided with a valve bank, and the hydrogen storage tank is switched to be communicated through the valve bank. The system is provided with a plurality of hydrogen storage tanks and the buffer tank which is communicated with the hydrogen storage tanks in series, the hydrogen storage tanks can be opened for multiple purposes, the later-stage maintenance is convenient, the buffer tank can further carry out pressure-stabilizing conveying on the hydrogen output by the opened hydrogen storage tank, and the safety is improved.)

1. A thermal power plant peak regulation system based on hydrogen production by water electrolysis is characterized by comprising:

a coal-fired boiler (1);

a hydrogen production unit (2) disposed upstream of the coal-fired boiler (1) process;

a flue gas recovery unit (3) arranged at the process downstream of the coal-fired boiler (1);

a high-voltage transformer (4) is arranged at the process upstream of the hydrogen production unit (2), and the input end of the high-voltage transformer (4) is connected with a booster station high-voltage bus;

the coal-fired boiler (1) is provided with a tail gas discharge flue (101);

the flue gas recovery unit (3) is communicated with the tail gas discharge flue (101) so as to guide part of tail gas in the tail gas discharge flue (101) to the coal-fired boiler (1) for secondary combustion;

the hydrogen production unit (2) is provided with water electrolysis hydrogen production equipment (201), the water electrolysis hydrogen production equipment (201) decomposes water into hydrogen, and the hydrogen production unit (2) conveys the decomposed hydrogen to the coal-fired boiler (1) and burns the hydrogen;

the hydrogen production unit (2) comprises a plurality of hydrogen storage tanks (202);

the hydrogen storage tanks (202) are connected in parallel, and the hydrogen storage tanks (202) are communicated with the water electrolysis hydrogen production equipment (201) through pipelines to receive and store hydrogen;

the hydrogen production unit (2) is communicated with a buffer tank (203) through a pipeline, and the buffer tank (203) is positioned at the process downstream of the hydrogen storage tank (202);

the hydrogen storage tanks (202) are communicated with the buffer tank (203) through pipelines;

the hydrogen production unit (2) is provided with a valve bank, and the hydrogen storage tank (202) is switched to be communicated through the valve bank.

2. The thermal power plant peak regulation system for producing hydrogen by electrolyzing water as claimed in claim 1, wherein the input end of the coal-fired boiler (1) is provided with a hydrogen combustion-supporting burner (102);

the flue gas recovery unit (3) comprises a cold air pipeline (304) communicated with external cold air equipment, and the output end of the cold air pipeline (304) is connected with a flue gas air mixer (307) through a first fan (302);

the flue gas recovery unit (3) further comprises a flue gas recovery pipeline (301) with one end communicated with the tail gas discharge flue (101) and the other end communicated with the flue gas air mixer (307), a second fan (305) is installed on the flue gas recovery pipeline (301), and the second fan (305) conveys part of flue gas in the tail gas discharge flue (101) into the flue gas air mixer (307) along the flue gas recovery pipeline (301) and mixes the part of flue gas with air conveyed by the cold air pipeline (304);

the output end of the flue gas-air mixer (307) is communicated with the hydrogen combustion-supporting burner (102) and conveys mixed gas into the hydrogen combustion-supporting burner (102).

3. The thermal power plant peak shaving system based on hydrogen production through water electrolysis according to claim 2, characterized in that a first air door (303) is installed between the flue gas-air mixer (307) and the hydrogen combustion-supporting burner (102), and a second air door (306) is installed on the flue gas recovery pipeline (301);

the first damper (303) is placed in the process downstream of the first fan (302);

the second damper (306) is placed in the process downstream of the second fan (305).

4. The peak shaving system of the thermal power plant based on hydrogen production by water electrolysis as claimed in claim 2, characterized in that the hydrogen production by water electrolysis equipment (201) is connected with the high voltage transformer (4);

the output end of the water electrolysis hydrogen production equipment (201) is communicated with a first pipeline (204);

the hydrogen storage tanks (202) are connected in parallel through second pipelines (205), and the water electrolysis hydrogen production equipment (201) is communicated with the hydrogen storage tanks (202) through the first pipelines (204);

the process downstream of the plurality of hydrogen storage tanks (202) is communicated with the buffer tank (203) through a third pipeline (206);

the output end of the buffer tank (203) is communicated with the hydrogen combustion-supporting burner (102).

5. The thermal power plant peak shaving system for producing hydrogen by electrolyzing water as claimed in claim 4, wherein each of said second pipelines (205) is connected with a branch (207).

6. The thermal power plant peak shaving system for producing hydrogen based on electrolyzed water as defined in claim 5, wherein the valve set comprises a first valve (208) installed on the first pipeline (204), a second valve (209) installed on the second pipeline (205), and a third valve (210) installed on a third pipeline (206);

the valve block further comprises a fourth valve (211) mounted on the branch (207).

Technical Field

The invention relates to the technical field of thermal power generation peak regulation systems, in particular to a peak regulation system of a thermal power plant based on hydrogen production by water electrolysis.

Background

In thermal power generation, the electrical load is not uniform. During peak power consumption, the power grid is often overloaded. At this time, the generator set needs to be put into operation outside the normal operation to meet the demand. These generator sets are called peak shaving sets. Because he is used for adjusting the peak of power utilization, the peak shaving unit is called. The peak regulating unit is required to be convenient and quick to start and stop, and the synchronization adjustment during grid connection is easy. The general peak regulating unit comprises a gas turbine unit, a pumped storage unit and the like.

Traditional peak regulation mode need be equipped with more peak regulation unit, uses to adjust relatively inconvenient to there is certain consumption to the energy, results in the peak regulation profit lower, and the supply mode competitiveness and the economic benefits of the single energy carrier of traditional power station are lower, and the boiler need throw oil when burning and surely burn, and pollutant discharge is serious, the not fine operation needs that satisfy.

Disclosure of Invention

The invention aims to provide a thermal power plant peak regulation system based on hydrogen production by water electrolysis, which reduces the power supply load of the thermal power plant by the water electrolysis hydrogen production system, effectively reduces the operation load of a boiler by putting hydrogen into the boiler for combustion supporting, improves the operation flexibility of the boiler, and realizes that the thermal power plant participates in deep peak regulation of a power grid all the year round.

In order to achieve the above purpose, the invention provides the following technical scheme:

the invention relates to a thermal power plant peak regulation system based on hydrogen production by water electrolysis, which comprises:

a coal-fired boiler;

a hydrogen generation unit disposed upstream of the coal fired boiler process;

a flue gas recovery unit disposed downstream of the coal fired boiler process;

a high-voltage transformer is arranged at the process upstream of the hydrogen production unit, and the input end of the high-voltage transformer is connected with a high-voltage bus of the booster station;

the coal-fired boiler is provided with a tail gas discharge flue;

the flue gas recovery unit is communicated with the tail gas discharge flue so as to guide part of tail gas in the tail gas discharge flue to the coal-fired boiler for secondary combustion;

the hydrogen production unit is provided with water electrolysis hydrogen production equipment which decomposes water into hydrogen and conveys the decomposed hydrogen to a coal-fired boiler for combustion;

the hydrogen production unit comprises a plurality of hydrogen storage tanks;

the hydrogen storage tanks are connected in parallel, and are communicated with the water electrolysis hydrogen production equipment through pipelines to receive and store hydrogen;

the hydrogen production unit is communicated with a buffer tank through a pipeline, and the buffer tank is positioned at the process downstream of the hydrogen storage tank;

the hydrogen storage tanks are communicated with the buffer tank through pipelines;

the hydrogen production unit is provided with a valve bank, and the hydrogen storage tank is switched to be communicated through the valve bank.

Further, the input end of the coal-fired boiler is provided with a hydrogen combustion-supporting burner;

the flue gas recovery unit comprises a cold air pipeline communicated with external cold air equipment, and the output end of the cold air pipeline is connected with a flue gas-air mixer through a primary air fan;

the flue gas recovery unit also comprises a flue gas recovery pipeline, one end of the flue gas recovery pipeline is communicated with the tail gas discharge flue, and the other end of the flue gas recovery pipeline is communicated with the flue gas air mixer;

and the output end of the flue gas air mixer is communicated with the hydrogen combustion-supporting burner and conveys mixed gas into the hydrogen combustion-supporting burner.

Further, a first air door is arranged between the flue gas and air mixer and the hydrogen combustion-supporting burner, and a second air door is arranged on the flue gas recovery pipeline;

the first air door is arranged at the process downstream of the first fan;

the second damper is disposed downstream of the second fan.

Further, the water electrolysis hydrogen production equipment is connected with the high-voltage transformer;

the output end of the water electrolysis hydrogen production equipment is communicated with a first pipeline;

the hydrogen storage tanks are connected in parallel through second pipelines, and the water electrolysis hydrogen production equipment is communicated with the hydrogen storage tanks through the first pipelines;

the process downstream of the hydrogen storage tanks is communicated with the buffer tank through third pipelines;

and the output end of the buffer tank is communicated with the hydrogen combustion-supporting burner.

Furthermore, each second pipeline is communicated with a branch.

Further, the valve group comprises a first valve arranged on the first pipeline, a second valve arranged on the second pipeline and a third valve arranged on a third pipeline;

the valve block further includes a fourth valve mounted on the branch.

In the technical scheme, the thermal power plant peak regulation system based on hydrogen production by water electrolysis has the following beneficial effects:

the device is provided with the water electrolysis hydrogen production equipment and the hydrogen storage tank, so that hydrogen generated by the water electrolysis hydrogen production equipment is conveyed to the hydrogen storage tank through the hydrogen pipeline, is conveyed to the hydrogen combustion-supporting burner after being stabilized by the hydrogen storage tank and enters the coal-fired boiler for combustion, the water electrolysis hydrogen production equipment consumes the power on the grid of the thermal power plant, the consumption of new energy electric quantity is facilitated, meanwhile, the load of the coal-fired boiler is reduced by the hydrogen combustion-supporting, the operation flexibility of the thermal power unit is improved, and the efficient clean comprehensive utilization and the product value increase of coal resources in the peak regulation stage of the power plant are realized;

meanwhile, the system is provided with a plurality of hydrogen storage tanks and buffer tanks communicated with the plurality of hydrogen storage tanks in series, the plurality of hydrogen storage tanks can realize the effect of multiple switches and multiple devices, the later-stage maintenance is convenient, and the buffer tanks can further carry out pressure-stabilizing conveying on the hydrogen output by the switched-on hydrogen storage tanks, so that the safety is improved.

In addition, all install corresponding valve on each pipeline of hydrogen generator group, through the intercommunication state of valves control pipeline, the operation is more nimble, makes things convenient for later stage equipment maintenance.

Drawings

In order to more clearly illustrate the embodiments of the present application or technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present invention, and other drawings can be obtained by those skilled in the art according to the drawings.

Fig. 1 is a schematic process flow diagram of a thermal power plant peak shaving system for producing hydrogen by electrolyzing water according to an embodiment of the present invention.

Description of reference numerals:

1. a coal-fired boiler; 2. a hydrogen production unit; 3. a flue gas recovery unit; 4. a high voltage transformer;

101. a tail gas discharge flue; 102. a hydrogen-fired burner;

201. water electrolysis hydrogen production equipment; 202. a hydrogen storage tank; 203. a buffer tank; 204. a first pipeline; 205. a second pipeline; 206. a third pipeline; 207. a branch circuit; 208. a first valve; 209. a second valve; 210. a third valve; 211. a fourth valve;

301. a flue gas recovery duct; 302. a first fan; 303. a first damper; 304. a cold air pipeline; 305. a second fan; 306. a second damper; 307. a flue gas and air mixer.

Detailed Description

In order to make the technical solutions of the present invention better understood, those skilled in the art will now describe the present invention in further detail with reference to the accompanying drawings.

As shown in fig. 1;

the invention relates to a thermal power plant peak regulation system based on hydrogen production by water electrolysis, which comprises:

a coal-fired boiler 1;

a hydrogen production unit 2 arranged at the process upstream of the coal-fired boiler 1;

a flue gas recovery unit 3 arranged at the process downstream of the coal-fired boiler 1;

the process upstream of the hydrogen production unit 2 is provided with a high-voltage transformer 4, and the input end of the high-voltage transformer 4 is connected with a high-voltage bus of the booster station;

the coal-fired boiler 1 has a tail gas discharge flue 101;

the flue gas recovery unit 3 is communicated with the tail gas discharge flue 101 so as to guide part of tail gas in the tail gas discharge flue 101 to the coal-fired boiler 1 for secondary combustion;

the hydrogen production unit 2 is provided with a water electrolysis hydrogen production device 201, the water electrolysis hydrogen production device 201 decomposes water into hydrogen, and the hydrogen production unit 2 conveys the decomposed hydrogen to the coal-fired boiler 1 and burns the hydrogen;

the hydrogen production unit 2 comprises a plurality of hydrogen storage tanks 202;

the hydrogen storage tanks 202 are connected in parallel, and the hydrogen storage tanks 202 are all communicated with the water electrolysis hydrogen production equipment 201 through pipelines to receive and store hydrogen;

the hydrogen production unit 2 is communicated with a buffer tank 203 through a pipeline, and the buffer tank 203 is positioned at the process downstream of the hydrogen storage tank 202;

the hydrogen storage tanks 202 are all communicated with the buffer tank 203 through pipelines;

the hydrogen production unit 2 is provided with a valve bank, and the hydrogen storage tank 202 is switched and communicated through the valve bank.

Specifically, this embodiment discloses a thermal power plant's power generation peak shaving system when can adjusting power consumption peak, it uses coal fired boiler 1 as main electric energy production equipment, hydrogen manufacturing unit 2 has been connected at coal fired boiler 1's technology upper reaches, the electrolysis water through hydrogen manufacturing unit 2 is principle to produce hydrogen, and concentrate and carry to burning in coal fired boiler 1, make the fuel environmental protection more, the energy is saved, in addition, consider the abundant burning of tail gas, flue gas recovery unit 3 that can retrieve partial tail gas has been integrated at coal fired boiler 1's technology low reaches, further burn in drainage to coal fired boiler 1 with partial tail gas, the energy has been saved, the combustion rate has been improved.

Preferably, the input end of the coal-fired boiler 1 in the embodiment is provided with a hydrogen combustion-supporting burner 102;

the flue gas recovery unit 3 comprises a cold air pipeline 304 communicated with external cold air equipment, and the output end of the cold air pipeline 304 is connected with a flue gas-air mixer 307 through a first fan 302;

the flue gas recovery unit 3 further comprises a flue gas recovery pipeline 301, one end of the flue gas recovery pipeline is communicated with the tail gas discharge flue 101, the other end of the flue gas recovery pipeline is communicated with a flue gas air mixer 307, a second fan 305 is installed on the flue gas recovery pipeline 301, and the second fan 305 conveys part of flue gas in the tail gas discharge flue 101 into the flue gas air mixer 307 along the flue gas recovery pipeline 301 and mixes the part of flue gas with air conveyed by the cold air pipeline 304;

the output end of the flue gas-air mixer 307 is communicated with the hydrogen-gas combustion-supporting burner 102 and delivers the mixed gas into the hydrogen-gas combustion-supporting burner 102.

A first air door 303 is installed between the flue gas-air mixer 307 and the hydrogen combustion-supporting burner 102, and a second air door 306 is installed on the flue gas recovery pipeline 301;

a first damper 303 is placed in the process downstream of the first blower 302;

a second damper 306 is placed in the process downstream of the second fan 305.

The water electrolysis hydrogen production equipment 201 is connected with the high-voltage transformer 4;

the output end of the water electrolysis hydrogen production equipment 201 is communicated with a first pipeline 204;

the hydrogen storage tanks 202 are connected in parallel through second pipelines 205, and the water electrolysis hydrogen production equipment 201 is communicated with the hydrogen storage tanks 202 through first pipelines 204;

the process downstream of the plurality of hydrogen storage tanks 202 is communicated with the buffer tank 203 through a third pipeline 206;

the output end of the buffer tank 203 is communicated with the hydrogen combustion-supporting burner 102.

The structure and the operating principle of the flue gas recovery unit 3 and the hydrogen production unit 2 are specifically introduced in the embodiment, wherein the flue gas recovery unit 3 uses the second fan 305 to return the tail gas part to the flue gas-air mixer 307, the first fan 302 communicated with the external cold air device is used for guiding the cold air to the flue gas-air mixer 307 for mixing, the mixed gas is conveyed to the medium-hydrogen combustion-supporting burner 307, the mixed gas is conveyed to the coal-fired boiler 1 for combustion together with the mixed gas after the hydrogen is conveyed from the upstream hydrogen production unit 2, so that most of energy is saved, the combustion rate is improved, and the workload of the original equipment is reduced.

In addition, the hydrogen storage tank 202 of this embodiment is designed as many parallelly connected structures, can open many hydrogen storage tanks 202 simultaneously according to the technological requirement and send hydrogen, can be convenient for later stage technology to overhaul moreover. Meanwhile, in order to facilitate switching of the communication state of the hydrogen storage tank 202, a valve bank of a control switch is installed in the hydrogen generator set 2.

The method specifically comprises the following steps:

each of the second pipes 205 is connected to a branch 207.

Wherein the valve block comprises a first valve 208 mounted on the first line 204, a second valve 209 mounted on the second line 205, a third valve 210 on the third line 206;

the valve block further comprises a fourth valve 211 mounted on the branch 207.

The valves are directly conventional electromagnetic valves controlled by an external control cabinet, and can rapidly switch the valve body to rapidly switch the communication state of the pipeline.

In the technical scheme, the thermal power plant peak regulation system based on hydrogen production by water electrolysis has the following beneficial effects:

according to the invention, the water electrolysis hydrogen production equipment 201 and the hydrogen storage tank 202 are arranged, so that hydrogen generated by the water electrolysis hydrogen production equipment is conveyed to the hydrogen storage tank 202 through a hydrogen pipeline, is subjected to pressure stabilization through the hydrogen storage tank 202 and then is sent to the hydrogen combustion-supporting burner 102 to enter the coal-fired boiler 1 for combustion, the water electrolysis hydrogen production equipment consumes the on-grid electricity of a thermal power plant, the consumption of new energy electric quantity is facilitated, meanwhile, the load reduction of the coal-fired boiler 1 is facilitated through hydrogen combustion supporting, the operation flexibility of the thermal power unit is improved, and the efficient clean comprehensive utilization and product value increase of coal resources in the peak regulation stage of the power plant;

meanwhile, the system is provided with a plurality of hydrogen storage tanks 202 and the buffer tank 203 which is communicated with the plurality of hydrogen storage tanks 202 in series, the plurality of hydrogen storage tanks 202 can be opened for a plurality of times, the later-period maintenance is convenient, the buffer tank 203 can further carry out pressure-stabilizing conveying on the hydrogen output by the opened hydrogen storage tanks 202, and the safety is improved.

In addition, all install corresponding valve on each pipeline of hydrogen generator set 2, through the intercommunication state of valves control pipeline, the operation is more nimble, makes things convenient for later stage equipment maintenance.

While certain exemplary embodiments of the present invention have been described above by way of illustration only, it will be apparent to those of ordinary skill in the art that the described embodiments may be modified in various different ways without departing from the spirit and scope of the invention. Accordingly, the drawings and description are illustrative in nature and should not be construed as limiting the scope of the invention.