阅读说明：本技术 一种过热蒸汽高效利用系统 (Superheated steam efficient utilization system ) 是由 王会 钟迪 黄永琪 彭烁 周贤 安航 白烨 于 2021-09-30 设计创作，主要内容包括：本发明公开了一种过热蒸汽高效利用系统,包括：热化学制氢设备,多余的过热蒸汽能够为所述热化学制氢设备提供热量；储氢罐,所述储氢罐的氢气进口与所述热化热制氢设备的氢气出口连通；燃料电池,所述燃料电池的氢气入口与所述储氢罐的第一氢气出口连通,所述燃料电池能够向电负荷设备供电。本发明中的储氢罐和燃料电池能够将多余的过热蒸汽中的热量以氢气的形式进行储存,且储氢罐能够实现较长时间的储存。在需要供电时,可以立即启动燃料电池来进行供电。因此,本发明中的过热蒸汽高效利用系统,不仅能够储存多余的过热蒸汽中的热量,避免造成过热蒸汽的浪费,而且储存的热量使用灵活。(The invention discloses a superheated steam high-efficiency utilization system, which comprises: a thermochemical hydrogen plant to which the excess superheated steam is capable of providing heat; a hydrogen inlet of the hydrogen storage tank is communicated with a hydrogen outlet of the thermalization thermal hydrogen production equipment; a fuel cell having a hydrogen inlet in communication with the first hydrogen outlet of the hydrogen storage tank, the fuel cell being capable of supplying power to an electrical load device. The hydrogen storage tank and the fuel cell can store the heat in the redundant superheated steam in the form of hydrogen, and the hydrogen storage tank can store the heat for a long time. When power supply is needed, the fuel cell can be started immediately to supply power. Therefore, the superheated steam efficient utilization system can store the heat in the redundant superheated steam, avoid waste of the superheated steam and enable the stored heat to be flexibly used.)

1. A superheated steam efficient utilization system, comprising:

a thermochemical hydrogen plant to which the excess superheated steam is capable of providing heat;

a hydrogen inlet of the hydrogen storage tank is communicated with a hydrogen outlet of the thermalization thermal hydrogen production equipment;

a fuel cell having a hydrogen inlet in communication with the first hydrogen outlet of the hydrogen storage tank, the fuel cell being capable of supplying power to an electrical load device.

2. The superheated steam high-efficiency utilization system of claim 1, further comprising a heat storage device and a heat load device, wherein the excess superheated steam in turn provides heat to the thermochemical hydrogen production device and the heat storage device, and the heat storage device is used to provide heat to the heat load device.

3. The superheated steam efficient-utilization system of claim 2, wherein the excess superheated steam provides heat to the thermochemical hydrogen plant via a first heat exchange device;

the superheated steam main pipe is communicated with a steam turbine, a first superheated steam branch pipe is connected to the superheated steam main pipe, and the first superheated steam branch pipe is communicated with a superheated steam inlet of the first heat exchange equipment.

4. The superheated steam high-efficiency utilization system of claim 3, wherein a superheated steam outlet of the first heat exchange device is communicated with a second superheated steam branch pipe, the second superheated steam branch pipe is communicated with a superheated steam inlet of a second heat exchange device, and the second heat exchange device is used for providing heat for the heat storage device.

5. The superheated steam efficient utilization system of claim 2, wherein the fuel cell is capable of providing heat to the heat storage device.

6. The superheated steam efficient utilization system of claim 5, wherein the fuel cell provides heat to the heat storage device through a third heat exchange device.

7. The superheated steam high-efficiency utilization system according to claim 1, further comprising a hydrogen charging station, wherein the second hydrogen outlet of the hydrogen storage tank is communicated with a hydrogen inlet of the hydrogen charging station.

8. The superheated steam efficient utilization system of claim 1, further comprising an activation control device for activating the fuel cell operation upon detection of a power usage of the electrical load device as a peak power usage.

9. The superheated steam efficient utilization system of claim 2, wherein the heat load device comprises a preheating device, a water heater.

10. The superheated steam high-efficiency utilization system according to claim 2, wherein the heat storage device is a sensible heat storage device or a latent heat storage device.

Technical Field

The invention relates to the field of coal-fired power stations, in particular to a system for efficiently utilizing superheated steam.

Background

Coal-fired power plants consume large quantities of coal to produce high temperature superheated steam to drive steam turbines to generate electricity. When the power supply demand of the coal-fired power plant is lowered, the high-temperature superheated steam generated during this time cannot be effectively utilized due to hysteresis on the coal-fired boiler side. In addition, in order to reduce the start-stop cost of the power station, the unit also needs to maintain low-load operation when the coal power does not need to be supplied, and superheated steam generated in the period is directly discharged, so that a large amount of heat resources are wasted.

Therefore, how to efficiently utilize the superheated steam, thereby realizing energy conservation and emission reduction and improving the economic benefit of the coal-fired power plant is a key problem to be solved urgently by technical personnel in the field.

Disclosure of Invention

The invention aims to realize the efficient utilization of the superheated steam, thereby realizing the energy conservation and emission reduction and improving the economic benefit of the coal-fired power station. In order to achieve the purpose, the invention provides the following technical scheme:

a superheated steam efficient utilization system comprising:

a thermochemical hydrogen plant to which the excess superheated steam is capable of providing heat;

a hydrogen inlet of the hydrogen storage tank is communicated with a hydrogen outlet of the thermalization thermal hydrogen production equipment;

a fuel cell having a hydrogen inlet in communication with the first hydrogen outlet of the hydrogen storage tank, the fuel cell being capable of supplying power to an electrical load device.

Preferably, the system further comprises a heat storage device and a heat load device, the redundant superheated steam sequentially provides heat for the thermochemical hydrogen production device and the heat storage device, and the heat storage device is used for providing heat for the heat load device.

Preferably, said excess superheated steam provides heat to said thermochemical hydrogen plant via first heat exchange means;

the superheated steam main pipe is communicated with a steam turbine, a first superheated steam branch pipe is connected to the superheated steam main pipe, and the first superheated steam branch pipe is communicated with a superheated steam inlet of the first heat exchange equipment.

Preferably, a superheated steam outlet of the first heat exchange device is communicated with a second superheated steam branch pipe, the second superheated steam branch pipe is communicated with a superheated steam inlet of a second heat exchange device, and the second heat exchange device is used for providing heat for the heat storage device.

Preferably, the fuel cell is capable of providing heat to the heat storage device.

Preferably, the fuel cell provides heat to the heat storage device through a third heat exchange device.

Preferably, the hydrogen storage tank further comprises a hydrogen adding station, and the second hydrogen outlet of the hydrogen storage tank is communicated with the hydrogen inlet of the hydrogen adding station.

Preferably, the fuel cell system further comprises a start-up control device for starting the fuel cell operation when it is detected that the power consumption of the electrical load device is a peak power consumption.

Preferably, the heat load device comprises a preheating device and a water heater.

Preferably, the heat storage device is a sensible heat storage device or a latent heat storage device.

It can be seen from the above technical solution that: the superheated steam efficient utilization system has the following beneficial effects:

firstly, the method comprises the following steps: the heat in the redundant superheated steam is fully absorbed by the thermochemical hydrogen production equipment and the heat storage equipment, so that the superheated steam is efficiently utilized.

Secondly, the method comprises the following steps: the heat in the superheated steam is stored in the hydrogen storage tank in the form of hydrogen, so that the superheated steam can be stored for a long time and can be used at any time, and the use is flexible.

Thirdly, the method comprises the following steps: when the electricity utilization is in a peak, the fuel cell is started to supply power to the electrical load equipment, so that the peak shaving effect is achieved.

Fourthly: the superheated steam utilization system does not influence the normal operation of the coal-electric machine set, and all the devices are flexibly arranged.

Drawings

In order to more clearly illustrate the solution of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the description below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without inventive efforts.

Fig. 1 is a schematic diagram of a system for efficiently utilizing superheated steam according to an embodiment of the present invention.

Wherein, 1 is a steam turbine, 2 is thermochemical hydrogen production equipment, 3 is a hydrogen storage tank, 4 is a fuel cell, 5 is heat storage equipment, 6 is electrical load equipment, and 7 is thermal load equipment.

Detailed Description

The invention discloses an efficient superheated steam utilization system, which can realize efficient utilization of superheated steam, thereby realizing energy conservation and emission reduction and improving the economic benefit of a coal-fired power plant.

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.

The invention discloses a superheated steam high-efficiency utilization system, which comprises: a thermochemical hydrogen production apparatus 2, a hydrogen storage tank 3, and a fuel cell 4. When the power supply requirement of the coal-fired power plant is reduced, the excess superheated steam can transfer heat to the thermochemical hydrogen production apparatus 2, so that the thermochemical hydrogen production apparatus 2 produces hydrogen. The thermochemical hydrogen production apparatus 2 feeds the produced hydrogen gas to the hydrogen storage tank 3 to be stored. The hydrogen storage tank 3 is capable of supplying hydrogen gas to the fuel cell 4.

When power supply from the fuel cell 4 is required, for example, when a power consumption peak occurs, the fuel cell 4 is started, and the fuel cell 4 takes hydrogen gas from the hydrogen storage tank 3 and burns to generate power, thereby supplying power to the electrical load device 6. Thus, the peak regulation effect can be achieved.

The hydrogen storage tank 3 and the fuel cell 4 in the present invention can store the heat in the excess superheated steam in the form of hydrogen gas, and the hydrogen storage tank 3 can realize storage for a long time. When power supply is required, the fuel cell 4 can be immediately started to supply power. Therefore, the superheated steam efficient utilization system can store the heat in the redundant superheated steam, avoid waste of the superheated steam and enable the stored heat to be flexibly used.

The hydrogen storage tank 3 can supply hydrogen to the hydrogen station in addition to the fuel cell 4, thereby widening the applicable range of the system.

After the redundant superheated steam provides heat for the thermochemical hydrogen production equipment 2, the redundant superheated steam also has certain heat, and if the redundant superheated steam is directly discharged, the waste of the heat can still be caused. For this purpose, the invention also provides a heat storage device 5 and a heat load device 7. The redundant superheated steam provides heat for the thermochemical hydrogen production device 2 and the heat storage device 5 in sequence. The heat storage device 5 can supply the stored heat to the heat consumer 7.

The heat exchange principle of the redundant superheated steam is as follows: the excess superheated steam first provides heat to the thermochemical hydrogen plant 2 via a first heat exchange device. The superheated steam enters the steam turbine 1 through a superheated steam main. The invention is characterized in that a first superheated steam branch pipe is connected to a superheated steam main pipe. One end of the first superheated steam branch pipe is communicated with the superheated steam main pipe, and the other end of the first superheated steam branch pipe is communicated with a superheated steam inlet of the first heat exchange equipment. The excess superheated steam provides heat to the thermochemical hydrogen plant 2 in a heat exchange manner as it passes through the first heat exchange means.

The first heat exchange equipment is also provided with a superheated steam outlet which is communicated with a second superheated steam branch pipe. The outlet of the second superheated steam branch pipe is communicated with the superheated steam inlet of the second heat exchange equipment. The superheated steam with much heat enters the second heat exchange device through the second superheated steam branch pipe, and in the second heat exchange device, the redundant superheated steam provides heat for the heat storage device 5 in a heat exchange mode. The heat storage device 5 absorbs the heat and stores the heat.

As is apparent from the above description, the fuel cell 4 is capable of supplying power to the electrical load device 6, and heat is generated during operation of the fuel cell 4. This heat, if released into the atmosphere, is also wasted. Therefore, the invention is designed as follows: the fuel cell 4 is defined to provide heat to the heat storage device 5. Specifically, the fuel cell 4 supplies heat to the heat storage device 5 through the third heat exchange device. The heat generated in the fuel cell 4 is carried by the heat transfer medium into the third heat exchange device, where it provides heat to the heat storage device 5 in a heat exchange manner. The heat storage device 5 absorbs the heat and stores the heat.

As can be seen from the above description, the fuel cell 4 can be activated during peak power periods to allow the fuel cell 4 to supply power to the electrical load device 6, so that peak shaving is achieved. In order to realize intelligent peak regulation, the invention is designed as follows: a start-up control device is provided which is capable of detecting the amount of electricity used by the electrical load devices 6. If the start-up control apparatus detects that the power consumption of the electrical load apparatus 6 is in a peak, the start-up control apparatus starts the operation of the fuel cell 4.

The thermal load device 7 in the present invention comprises a preheating device, such as for example pulverized coal or air in a preheating electric field. The thermal load device 7 also comprises a water heater for providing hot water to users outside the power plant.

The heat storage device 5 in the invention is sensible heat storage device or latent heat storage device. The sensible heat storage equipment and the latent heat storage equipment have the advantages of high safety, simple system structure, stable operation and the like.

The thermochemical hydrogen production equipment 2 is ammonia decomposition hydrogen production equipment or metal hydride decomposition hydrogen production equipment.

In summary, the superheated steam efficient utilization system of the invention has the following beneficial effects:

firstly, the method comprises the following steps: the heat in the redundant superheated steam is fully absorbed by the thermochemical hydrogen production equipment 2 and the heat storage equipment 5, so that the superheated steam is efficiently utilized.

Secondly, the method comprises the following steps: the heat in the superheated steam is stored in the hydrogen storage tank 3 in the form of hydrogen, so that the superheated steam can be stored for a long time, can be used at any time and is flexible to use.

Thirdly, the method comprises the following steps: when the electricity utilization is in a peak, the fuel cell 4 is started to supply power to the electrical load equipment 6, so that the peak regulation effect is achieved.

Fourthly: the superheated steam utilization system does not influence the normal operation of the coal-electric machine set, and all the devices are flexibly arranged.

Finally, it should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.