CN113583714A - Supercritical and above parameter coal electric unit coupling supercritical water hydrogen production system and method - Google Patents
Supercritical and above parameter coal electric unit coupling supercritical water hydrogen production system and method Download PDFInfo
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Abstract
The invention provides a supercritical and above parameter coal-electric unit coupling supercritical water hydrogen production system and method, which comprises the following steps: the coal-electricity unit thermodynamic system with supercritical and above parameters is used for providing supercritical water, coal powder and low-pressure medium-temperature water; the supercritical and coupled hydrogen production system is used for producing hydrogen by utilizing supercritical water, coal powder and low-pressure medium-temperature water. The invention can make full use of the residual load space of the coal-electricity unit, enables the unit to be in a high-load-level running state, improves the running level and efficiency of the coal-electricity unit, and can effectively utilize the generated supercritical water without reducing the evaporation capacity of a boiler when the unit participates in load reduction and peak regulation, thereby reducing the generated energy, realizing flexible peak regulation and prolonging the service life of the unit. The thermodynamic system of the supercritical and above parameter coal-power unit can be directly transformed by the existing widely adopted supercritical and above parameter coal-powder furnace generator unit, and the related cost of hydrogen production by supercritical water is greatly reduced.
Description
Technical Field
The invention belongs to the field of clean energy conversion, and particularly relates to a supercritical and above parameter coal-electric unit coupling supercritical water hydrogen production system and method.
Background
As the most widely distributed substance in the universe, hydrogen is considered to be the cleanest and most potential energy source form in the world due to the characteristics of high heat value of unit mass, water as the final product of oxidation reaction such as combustion and the like. Numerous researches and applications are developed in the field of hydrogen energy in countries including China, such as hydrogen fuel cells, large-scale wind and electricity abandonment hydrogen production, advanced coal hydrogen production technology and the like. The large-scale application of hydrogen energy mainly focuses on three aspects of preparation, storage and utilization, in the aspect of preparation, in recent years, the supercritical water gasification hydrogen production technology draws wide attention with near-zero pollutant emission and high hydrogen production efficiency, but the corresponding equipment manufacturing cost and construction cost are high, and the supercritical water gasification hydrogen production unit constructed independently does not have good economy within a short time.
On the other hand, China is a country with more coal, less oil and less gas, and is a country with more coal and less oil and is lack of gas, in order to adapt to the energy requirement brought by the rapid development of the economy of China, China builds a large number of coal-electric units, with the continuous development of the scientific and technological strength and the continuous maturity of related industries of China, the operation parameters of the coal-electric units of China are gradually improved, the supercritical parameters are reached, and the coal-electric units with the supercritical and the above parameters are built on a large scale in China since 2005 and the loading amount is continuously improved due to the mature technical route, equipment technology and higher power generation efficiency. However, due to the aggravation of environmental problems such as global warming caused by greenhouse gas emission, the installation of renewable energy sources such as wind power, photovoltaic and other power generation technologies is rising, the power generation space of the thermal power generation unit is greatly occupied, most of the coal power generation units in China are in a state of extremely low utilization hours all the year round at the present stage, the thermal power generation unit efficiency is low in a low-load operation state, the service life of the coal power generation unit is greatly reduced due to rapid change of load, and how to effectively utilize the residual load space of the coal power generation unit by using related technologies is a research difficulty at the present stage.
Disclosure of Invention
The invention aims to provide a supercritical and above parameter coal-electric unit coupled supercritical water hydrogen production system and method, and solves the defects in the prior art.
In order to achieve the purpose, the invention adopts the technical scheme that:
the invention provides a supercritical and above parameter coal electric unit coupling supercritical water hydrogen production system, which comprises:
the coal-electricity unit thermodynamic system with supercritical and above parameters is used for providing supercritical water, coal powder and low-pressure medium-temperature water;
the supercritical and coupled hydrogen production system is used for producing hydrogen by utilizing supercritical water, coal powder and low-pressure medium-temperature water.
Preferably, the thermodynamic system of the coal-electric unit with the parameters of supercritical and above comprises a water supply system, a boiler and a powder preparation system, wherein a water outlet of the water supply system is divided into two paths, one path is connected with a water inlet of the boiler, and the other path is connected with a supercritical and coupling hydrogen production system; the discharge port of the powder preparation system is divided into two paths, one path is connected with the feed port of the boiler, and the other path is connected with the supercritical and coupled hydrogen production system;
and a supercritical water outlet of the boiler is connected with a supercritical and coupling hydrogen production system.
Preferably, a high-temperature high-pressure steam outlet of the boiler is connected with a high-pressure cylinder, a medium-temperature medium-pressure outlet of the high-pressure cylinder is connected with a medium-low pressure cylinder, and a steam extraction outlet of the medium-low pressure cylinder is connected with a supercritical and coupling hydrogen production system.
Preferably, the water supply system comprises a water supply pump, a high-pressure heater, a water supplementing system, a circulating water pump, a fine processing device 0, a low-pressure heater and a deaerator, wherein a water outlet of the water supplementing system is connected with a water inlet of the boiler through the circulating water pump, the fine processing device 0, the low-pressure heater, the deaerator, the water supply pump and the high-pressure heater in sequence; the water outlet of the deaerator is also connected with a supercritical and coupling hydrogen production system.
Preferably, the supercritical and coupled hydrogen production system comprises a high-concentration coal slurry mixer, a coal slurry supercritical water mixer, a supercritical reactor, a gas-solid separation device and a hydrogen collection device, wherein a coal powder outlet of the thermodynamic system of the supercritical and above parameters coal-electricity unit is connected with a feed inlet of the high-concentration coal slurry mixer; a low-pressure medium-temperature water outlet of the coal electric unit thermodynamic system with the supercritical and above parameters is connected with a water inlet of the high-concentration coal slurry mixer; the discharge port of the high-concentration coal slurry mixer is connected with the slurry inlet of the coal slurry supercritical water mixer;
a supercritical water inlet of the coal slurry supercritical water mixer is connected with a supercritical water outlet of a coal-electric unit thermodynamic system with supercritical and above parameters;
the slurry outlet of the coal slurry supercritical water mixer is connected with the slurry inlet of the supercritical reactor, the gas-solid mixture outlet of the supercritical reactor is connected with the gas-solid separation device, and the hydrogen outlet of the gas-solid separation device is connected with the hydrogen collection device.
Preferably, a high-pressure steam-driven coal slurry plunger pump and a coal slurry heat regenerator are sequentially arranged between the slurry outlet of the high-concentration coal slurry mixer and the slurry inlet of the coal slurry supercritical water mixer, wherein the steam inlet of the high-pressure steam-driven coal slurry plunger pump is connected with the steam extraction outlet of the thermodynamic system of the coal-electric machine set with supercritical and above parameters.
Preferably, the supercritical reactor is further connected with a high-pressure catalyst mixer, and a water inlet of the high-pressure catalyst mixer is connected with a high-pressure water outlet of a thermodynamic system of the coal-electric machine set with the parameters of supercritical and above.
A supercritical and above parameter coal-electric unit coupling supercritical water hydrogen production method is based on the system and comprises the following steps:
feeding low-pressure medium-temperature water and coal powder in a coal-electricity unit thermodynamic system with supercritical and above parameters into a supercritical and coupling hydrogen production system for mixing to obtain low-pressure high-concentration coal slurry;
supercritical water in a coal-electricity unit thermodynamic system with supercritical and above parameters is sent into a supercritical and coupling hydrogen production system and is subjected to mixed reaction with low-pressure high-concentration coal slurry to produce hydrogen.
Preferably, the supercritical and coupled hydrogen production system is shut down when any of the following conditions are met:
the minimum coal feeding quantity of the high-concentration coal slurry mixer corresponding to the minimum working power of the supercritical and coupling hydrogen production system is smaller than the difference between the maximum coal powder quantity of the coal pulverizing system and the real-time coal powder quantity of the boiler required by the boiler in the operation of the thermodynamic system of the coal-electric unit with supercritical and above parameters;
the minimum water flow of the high-concentration coal slurry mixer corresponding to the minimum working power of the supercritical and coupling hydrogen production system is smaller than the difference between the maximum pump water amount of the circulating water pump and the real-time water flow required by the boiler in the operation of the coal-electric unit thermodynamic system with the supercritical and above parameters;
the minimum supercritical water flow of the coal slurry-supercritical water mixer corresponding to the minimum working power of the supercritical and coupled hydrogen production systems is less than the difference between the maximum continuous evaporation capacity of the boiler and the required evaporation capacity corresponding to the real-time power of the high pressure cylinder in the operation of the coal-electric unit thermodynamic system with supercritical and above parameters.
Compared with the prior art, the invention has the beneficial effects that:
the supercritical and above parameter coal-electricity unit coupling supercritical water hydrogen production system provided by the invention is based on the existing supercritical and above parameter coal-electricity unit scheme, realizes poly-generation of electric power and hydrogen energy by adding the supercritical coupling hydrogen production system, does not need to destroy the corresponding equipment structure of the original coal-electricity unit, does not need to repeatedly invest redundant coal storage, transportation and coal powder production equipment systems, does not need to add excessive pumps and thermal equipment, greatly reduces the size of the corresponding slurry pump, effectively reduces the related cost of supercritical water hydrogen production, and can generate hundreds of millions of expenses by only constructing a closed coal bunker, a corresponding coal transportation route and coal grinding equipment in a million-level unit to meet the requirement of environmental protection. Meanwhile, the invention can fully utilize the residual load space of the coal-electric machine set, so that the coal-electric machine set is in a high-load-level running state, the running level and the efficiency of the coal-electric machine set are improved, and when the coal-electric machine set participates in peak shaving, the generated energy can be utilized neatly and effectively under the condition of not reducing the evaporation capacity of a boiler, the generated energy is reduced, the flexible peak shaving is realized, and the service life of the coal-electric machine set is prolonged.
Drawings
FIG. 1 is a general schematic diagram of a supercritical water hydrogen production system coupled with a coal-electric machine set with parameters above supercritical water.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1, the supercritical and above parameter coal electric unit coupled supercritical water hydrogen production system provided by the present invention comprises a supercritical and above parameter coal electric unit thermodynamic system, a supercritical coupled hydrogen production system and a valve control system, wherein:
the thermal system of the coal-electricity machine set with the supercritical and above parameters is a pulverized coal combustion boiler with the supercritical and above parameters (generally referring to steam circulation parameters, the temperature is more than 374 ℃, and the pressure is more than 22.1MPa) which are mainly adopted in the world at present, the thermodynamic system comprises main equipment including a water feed pump 1-1, a high-pressure heater 1-2, a boiler 1-3, a pulverizing system 1-4, a high-pressure cylinder 1-5, a medium-low pressure cylinder 1-6, a condensing system 1-7, a water supplementing system 1-8, a circulating water pump 1-9, fine processing equipment 1-10, a low-pressure heater 1-11 and a deaerator 1-12, wherein, the water supply system of the boiler 1-3 is composed of a water supply system 1-8, a circulating water pump 1-9, a fine processing device 1-10, a low-pressure heater 1-11 and a deaerator 1-12.
And the water outlets of the water supplementing systems 1 to 8 are sequentially connected with the water inlets of the circulating water pumps 1 to 9, the fine processing equipment 1 to 10, the low-pressure heater 1 to 11 and the deaerator 1 to 12.
The water outlet of the deaerator 1-12 is connected with the water inlet of the boiler 1-3 through the water feed pump 1-1 and the high-pressure heater 1-2.
And the discharge port of the pulverizing system 1-4 is connected with the feed port of the boiler 1-3.
The high-temperature high-pressure steam outlet of the boiler 1-3 is connected with the steam inlet of the high-pressure cylinder 1-5, and the medium-temperature medium-pressure steam outlet of the high-pressure cylinder 1-5 is connected with the medium-temperature medium-pressure steam inlet of the medium-low pressure cylinder 1-6.
The medium-temperature and medium-pressure steam outlet of the boiler 1-3 is connected with the medium-temperature and medium-pressure steam inlet of the medium-low pressure cylinder 1-6.
The high pressure cylinders 1-5 and the medium and low pressure cylinders 1-6 are connected with generators.
And the exhaust steam outlet of the medium and low pressure cylinder 1-6 is connected with a condensing system 1-7, wherein the water outlet of the condensing system 1-7 is connected with a circulating water pump 1-9.
The supercritical coupling hydrogen production system comprises a high-concentration coal slurry mixer 2-1, a high-pressure pneumatic coal slurry plunger pump 2-2, a coal slurry heat regenerator 2-3, a coal slurry-supercritical water mixer 2-4, a supercritical reactor 2-5, a high-pressure catalyst mixer 2-6, a gas-solid separation device 2-7, a hydrogen collecting device 2-8, solid-waste separator equipment 2-9, a waste treatment device 2-10 and a material return pump 2-11, wherein a discharge port of the powder preparation system 1-4 is connected with a feed port of the high-concentration coal slurry mixer 2-1; the water outlet of the deaerator 1-12 is also connected with the water inlet of a high-concentration coal slurry mixer 2-1, and the slurry outlet of the high-concentration coal slurry mixer 2-1 is connected with the slurry inlet of a coal slurry heat regenerator 2-3 through a high-pressure pneumatic coal slurry plunger pump 2-2; and the steam extraction outlet of the medium and low pressure cylinder 1-6 is connected with the steam inlet of the high-pressure steam coal slurry plunger pump 2-2.
The high-temperature slurry outlet of the coal slurry heat regenerator 2-3 is connected with the slurry inlet of the coal slurry-supercritical water mixer 2-4.
And a supercritical water inlet of the coal slurry-supercritical water mixer 2-4 is connected with a supercritical water outlet of the boiler 1-3.
The slurry outlet of the coal slurry-supercritical water mixer 2-4 is connected with the slurry inlet of the supercritical reactor 2-5; and a catalyst inlet of the supercritical reactor 2-5 is connected with a catalyst outlet of the high-pressure catalyst mixer 2-6.
The water inlet of the high-pressure catalyst mixer 2-6 is connected with the high-pressure water outlet of the high-pressure heater 1-2.
A gas-solid mixture outlet of the supercritical reactor 2-5 is connected with a gas-solid separation device 2-7, and a hydrogen outlet of the gas-solid separation device 2-7 is connected with a hydrogen collection device 2-8; and an impurity outlet of the gas-solid separation device 2-7 is connected with a solid-waste separator device 2-9 through a coal slurry heat regenerator 2-3.
The waste outlet of the solid waste separator device 2-9 is connected with a waste treatment device 2-10; and the other product outlets of the solid waste separator devices 2-9 are connected with the supercritical reactor 2-5 through a feed back pump 2-11.
And a high-temperature and high-pressure regulating valve group 3-1 is arranged on a supercritical water pipeline between the boiler 1-3 and the coal slurry-supercritical water mixer 2-4.
And a powder quantity regulating valve 3-2 is arranged on a connecting pipeline between the pulverizing system 1-4 and the high-concentration coal slurry mixer 2-1. The coal powder quantity regulating valve 3-2 is internally provided with devices for preventing coal powder at the valve group from being blocked, such as vibration beating, stirring sweeping and the like.
And a medium-temperature low-pressure regulating valve 3-3 is arranged on a connecting pipeline between the deaerator 1-12 and the high-concentration coal slurry mixer 2-1.
And a regulating valve 3-4 is arranged on a connecting pipeline between the middle and low pressure cylinders 1-6 and the high pressure pneumatic coal slurry plunger pump 2-2.
And a high-pressure medium-temperature regulating valve 3-5 is arranged on a connecting pipeline between the high-pressure heater 1-2 and the high-pressure catalyst mixer 2-6.
And catalyst quantity control valves 3-6 are arranged at the feed inlets of the high-pressure catalyst mixers 2-6.
The working principle of the invention is as follows:
the coal-electric machine set thermodynamic system with the parameters of supercritical and above has a maximum operation power P1-maxWhich has a maximum continuous evaporation capacity Q corresponding to boilers 1-313-maxWhen the coal-electricity unit thermodynamic system 1 with supercritical and above parameters runs in a grid-connected mode, a power P is sent from a power grid in real time1，P1The required boiler evaporation capacity is Q13-1The real-time evaporation capacity of the boilers 1-3 in operation is Q13The coal supply quantity of the coal pulverizing system 1-4 correspondingly required under the evaporation capacity of the boiler is M14-13The actual coal feeding amount of the coal pulverizing system 1-4 is M14The maximum coal feeding quantity of the coal pulverizing system is M14-maxThe flow rate of 1-9 of the circulating water pump required under the evaporation capacity of the boiler is Q19-13The circulating water pump has a maximum water pumping quantity Q19-maxCycle ofThe real-time flow of the water pumped by the annular water pumps 1-9 is Q19。
The working process of the coal-electric unit thermodynamic system with the supercritical and above parameters comprises the following steps: the water pumped by the circulating water pump 1-9 sequentially enters a fine treatment device 1-10, a low-pressure heater 1-11 and a deaerator 1-12 to perform fine treatment, deaerating and low-temperature heating on the water entering the boiler 1-3, one strand of the water flows into a water feed pump 1-1 after leaving the deaerator 1-12, and the flow rate of the water is Q11The other flows into a high-concentration coal slurry mixer 2-1 with the flow rate of Q21Thus Q11And Q21Should be equal to Q19，Q11And Q21The relative size of the pressure regulating valve is regulated by a medium-temperature low-pressure regulating valve 3-3. After water pumped by the circulating water pump 1-9 leaves the deaerator 1-12, one strand of water flows into the water feeding pump 1-1 to be boosted and then enters the high-pressure heater 1-2 to be further heated, and after the water flows out of the high-pressure heater 1-2, one strand of high-pressure water flows into the high-pressure catalyst mixer 2-6 with the flow rate of Q26，Q26The size of the high-pressure medium-temperature regulating valve is mainly regulated by a high-pressure water input into a cooling wall surface in a boiler 1-3 for heating, and the flow rate is Q13The coal powder preparation amount of the powder preparation system 1-4 is M14One stream of water flows into the boiler 1-3, is ignited by a burner in the boiler and heats the heated wall surface of the boiler 1-3, and the coal feeding amount of the water is equal to the coal feeding amount correspondingly required under the real-time evaporation amount of the boiler and is M14-13The other coal powder is conveyed to a high-concentration coal slurry mixer 2-1 from a coal powder conveying pipeline between a coal pulverizing system 1-4 and a boiler 1-3, and the coal feeding amount is M21Considering the adhesion and accumulation of coal dust in pipes and valves, M14-13And M21Should be less than or equal to M14，M14-13And M21Is regulated by a coal dust quantity regulating valve 3-2 in the bypass. The water flow is heated in the boilers 1-3 to a power P1After the high-temperature high-pressure steam with required parameters flows into a high-pressure cylinder 1-5 to do work, and the flow rate is P1The required boiler evaporation capacity is Q13-1The other end is conveyed to a coal slurry-supercritical water mixer 2-4 through a supercritical water pipeline between a boiler 1-3 and a high-pressure cylinder 1-5, and the flow rate is Q13-24Thus Q13-1And Q13-24Should be equal to the flow Q of the feed boilers 1-311，Q13-1And Q24The relative size of the bypass is adjusted by a high-temperature high-pressure adjusting valve group 3-1 in the bypass; after the high-temperature high-pressure steam works in the high-pressure cylinder 1-5, the medium-temperature medium-pressure steam flows into the medium-low pressure cylinder 1-6 to further work, part of extracted steam enters the boiler 1-3 to be reheated, and the flow rate is Q16-13Reflows to the middle and low pressure cylinders 1-6 to do work again, the working efficiency of the thermodynamic system is improved, the other part of extracted steam is transmitted to the high-pressure steam-operated coal slurry plunger pump 2-2 through the high-temperature high-pressure auxiliary steam pipeline, and the flow Q of the extracted steam is16-22Controlled by a regulating valve 3-4 on a high-temperature high-pressure auxiliary steam pipeline, steam enters a middle and low pressure cylinder 1-6 and a high pressure cylinder 1-5 and then works to drive a corresponding electric system to generate electricity; the residual dead steam is discharged from the medium and low pressure cylinders 1-6 and then enters a condensing system 1-7 for cooling, and the flow rate is Q17The post water replenishing system 1-8 replenishes water to the system according to the real-time running state, and the water replenishing flow is Q18The corresponding relationship in real time should satisfy the following equation:
Q19＝Q17+Q18
the corresponding water flow flows into the circulating water pumps 1-9 again for boosting and pumping, and the thermodynamic system completes corresponding circulation.
The supercritical and coupling hydrogen production system is operated in a coupling mode with a thermodynamic system of a coal-electricity unit with supercritical and above parameters, the amount of coal dust entering a high-concentration coal slurry mixer 2-1 is adjusted by a coal dust amount adjusting valve 3-2 arranged in a bypass from a coal dust conveying pipeline between 1-4 of a coal pulverizing system to 1-3 of a boiler to the high-concentration coal slurry mixer 2-1, the amount of coal dust entering a high-concentration coal slurry mixer 2-1 is adjusted by a medium-temperature low-pressure adjusting valve 3-3 arranged in a bypass from a deaerator 1-11 to a water feed pump 1-1 between low-pressure medium-temperature water pipelines to the high-concentration coal slurry mixer 2-1, the coal dust is mixed with water in the high-concentration coal slurry mixer 2-1 to form low-pressure high-concentration coal slurry, and the mass fraction omega of the coal slurry is mixed into low-pressure high-concentration coal slurry21Comprises the following steps:
ω21＝M21/(Q21+M21)
the coal slurry leaves from the high-concentration coal slurry mixer 2-1 and is input into a high-pressure steam-operated coal slurry plunger pump 2-2, and steam extracted from a medium-low pressure cylinder 1-6 passes through a high-temperature high-pressure auxiliary steam pipeThe high-pressure steam-driven coal slurry plunger pump 2-2 is driven to move by a road, high-concentration coal slurry is pumped to a coal slurry heat regenerator 2-3 by a boosting pump to be heated in a first step and flows into a coal slurry-supercritical water mixer 2-4 after being heated, the pressure of the high-concentration coal slurry is determined by the power of the high-pressure steam-driven coal slurry plunger pump 2-2, and the power of the high-pressure steam-driven coal slurry plunger pump 2-2 is mainly determined by steam extraction amount and steam extraction parameters; after entering a coal slurry-supercritical water mixer 2-4, the high-concentration coal slurry is mixed with supercritical water from a boiler 1-3 to a supercritical water pipeline between a high-pressure cylinder 1-5 to form a feed coal slurry, and the mass coefficient omega of the coal slurry is24Comprises the following steps:
ω24＝(M21+Q13-24)/(Q21+M21+Q13-24)
under the real-time condition, the supercritical reactor 2-5 should have an optimal mass coefficient omega of the coal slurry entering the furnacebestIf ω is24And omegabestAdjusting the high-temperature and high-pressure adjusting valve group 3-1 and the Q value in case of phase deviation21Coal powder quantity regulating valve 3-2, regulating M21Medium temperature low pressure regulating valve 3-3 regulating Q13-24Make it reach the optimum omegabest. Conveying the feed coal slurry to a supercritical reactor 2-5 for reaction to produce hydrogen; high-pressure water flows into a high-pressure catalyst mixer 2-6 from a high-pressure heater 1-2 to be mixed with a catalyst, the amount of the added catalyst is controlled by a catalyst amount control valve 3-6, the amount of the catalyst is determined by the real-time reaction state of a supercritical reactor 2-5, and Q26The size of the catalyst is mainly adjusted by a high-pressure medium-temperature adjusting valve 3-5, and the high-pressure catalyst solution mixed in a high-pressure catalyst mixer 2-6 is conveyed to a supercritical reactor 2-5 to react with coal slurry.
The gas-solid mixed product after the reaction in the supercritical reactor 2-5 is conveyed to a gas-solid separation device 2-7 for gas-solid separation, the hydrogen is separated out and then enters a hydrogen collecting device 2-8, other products are continuously conveyed to a solid waste separator device 2-9, the heat of the product is recovered by a coal slurry heat regenerator 2-3 in the middle, high-concentration coal slurry is preheated, the waste separated in the solid waste separator device 2-9 enters a waste treatment device 2-10 for subsequent treatment, and the rest products are boosted by a material returning pump 2-11 and then sent back to the supercritical reactor 2-5 for further reaction.
The hydrogen collecting devices 2-8 are used for short-term storage of hydrogen produced by the coupling hydrogen production system, can externally burn the hydrogen and convey the hydrogen to other hydrogen storage and transportation equipment, and the internal monitoring pressure of the hydrogen collecting devices is P28The flow rate input from the gas-solid separation device 2-7 to the hydrogen collection device 2-8 is Q28At the same time, the hydrogen collecting device has an internal pressure P corresponding to the maximum hydrogen capacity28-maxWhen is coming into contact with
P28≥P28-max
When the process is carried out, valves 3-1, 3-2, 3-3, 3-4, 3-5 and 3-6 are all closed, the feeding process of the supercritical coupling hydrogen production system is stopped, the residual materials of the equipment can still support the reaction to continue, and a hydrogen collecting device 2-8 carries out external combustion on the stored hydrogen, wherein the flow of the combustion hydrogen is QBurning ofWhen externally discharged for combustion, QBurning ofIt should satisfy:
1.05Q28≥Qburning of≥Q28
When the flow Q is input into the hydrogen collecting device 2-8 from the gas-solid separating device 2-728Reduced to a certain value (flow rate Q)28-min) And the pressure P of the hydrogen collecting device is 2-828Less than the maximum pressure, flaring combustion ceases, which satisfies the following relationship:
P28＜P28-max，Q28＜Q28-min
wherein Q is28-minThe device is set according to the scale of the corresponding hydrogen production system.
The supercritical and above parameter coal-electricity unit coupled supercritical water hydrogen production system mainly follows the load change of the supercritical and above parameter coal-electricity unit thermodynamic system, and the residual power margin is used for supercritical and coupled hydrogen production, so that the supercritical and coupled hydrogen production system has minimum working power, and the coal feeding amount of the supercritical and coupled hydrogen production system is M21-minThe high-pressure low-temperature water amount is Q21-minSupercritical water amount is Q13-24-minWhen one of the following conditions occurs, the supercritical and coupled hydrogen production system stops feeding, and valves 3-1, 3-2, 3-3, 3-4, 3-5, 3-6 all occurAnd (3) closing the system, stopping hydrogen production, and independently operating by a coal-electric unit thermodynamic system with supercritical and above parameters:
minimum coal feeding quantity M of high-concentration coal slurry mixer 2-1 corresponding to minimum working power of supercritical and coupled hydrogen production system21-minLess than the maximum coal powder amount M of the pulverizing system 1-414-maxThe real-time pulverized coal quantity M of the boilers 1-3 required by the boilers 1-3 in the operation of the coal-electric machine set thermodynamic system with the supercritical and above parameters14-13The difference between the two;
minimum water flow Q of high-concentration coal slurry mixer 2-1 corresponding to minimum working power of supercritical and coupled hydrogen production system21-minLess than the maximum pump water quantity Q of 1-9 of the circulating water pump19-maxReal-time water flow Q required by boilers 1-3 in operation of coal-electric set thermodynamic system with supercritical and above parameters19-13The difference between the two;
minimum supercritical water flow Q of coal slurry-supercritical water mixer 2-4 corresponding to minimum working power of supercritical and coupled hydrogen production system13-24-minLess than 1-3 maximum continuous evaporation capacity Q of boiler13-maxRequired evaporation capacity Q corresponding to real-time power of 1-5 high-pressure cylinders in supercritical and above parameter coal-electric machine set thermodynamic system operation13-1The difference between them.
Claims (9)
1. A supercritical and above parameter coal-electric unit coupling supercritical water hydrogen production system is characterized by comprising:
the coal-electricity unit thermodynamic system (1) with supercritical and above parameters is used for providing supercritical water, coal powder and low-pressure medium-temperature water;
the supercritical and coupling hydrogen production system (2) is used for producing hydrogen by utilizing supercritical water, coal powder and low-pressure medium-temperature water.
2. The supercritical and above parameter coal-electric unit coupling supercritical water hydrogen production system according to claim 1, characterized in that the supercritical and above parameter coal-electric unit thermodynamic system (1) comprises a water supply system, boilers (1-3) and a pulverizing system (1-4), wherein the water outlet of the water supply system is divided into two paths, one path is connected with the water inlet of the boilers (1-3), and the other path is connected with the supercritical and coupling hydrogen production system (2); the discharge port of the powder preparation system (1-4) is divided into two paths, one path is connected with the feed port of the boiler (1-4), and the other path is connected with the supercritical and coupled hydrogen production system (2);
and a supercritical water outlet of the boiler (1-3) is connected with the supercritical and coupling hydrogen production system (2).
3. The supercritical and above parameter coal-electric machine set coupling supercritical water hydrogen production system according to claim 2, characterized in that the high temperature and high pressure steam outlet of the boiler (1-3) is connected with a high pressure cylinder (1-5), the medium temperature and medium pressure outlet of the high pressure cylinder (1-5) is connected with a medium and low pressure cylinder (1-6), and the extraction steam outlet of the medium and low pressure cylinder (1-6) is connected with the supercritical and coupling hydrogen production system (2).
4. The supercritical water hydrogen production system based on coupling of supercritical and above parameters of a coal-electric unit according to claim 2 is characterized in that the water supply system comprises a water supply pump (1-1), a high-pressure heater (1-2), a water charging system (1-8), a circulating water pump (1-9), a fine processing device (1-10), a low-pressure heater (1-11) and a deaerator (1-12), wherein a water outlet of the water charging system (1-8) is connected with a water inlet of a boiler (1-3) through the circulating water pump (1-9), the fine processing device (1-10), the low-pressure heater (1-11), the deaerator (1-12), the water supply pump (1-1) and the high-pressure heater (1-2) in sequence; the water outlet of the deaerator (1-12) is also connected with a supercritical and coupling hydrogen production system (2).
5. The supercritical and above parameter coal-electric unit coupling supercritical water hydrogen production system according to claim 1, characterized in that the supercritical and coupling hydrogen production system (2) comprises a high concentration coal slurry mixer (2-1), a coal slurry-supercritical water mixer (2-4), a supercritical reactor (2-5), a gas-solid separation device (2-7) and a hydrogen collection device (2-8), wherein a pulverized coal outlet of the supercritical and above parameter coal-electric unit thermodynamic system (1) is connected with a feed inlet of the high concentration coal slurry mixer (2-1); a low-pressure medium-temperature water outlet of the coal-electric unit thermodynamic system (1) with the supercritical and above parameters is connected with a water inlet of the high-concentration coal slurry mixer (2-1); the discharge hole of the high-concentration coal slurry mixer (2-1) is connected with the slurry inlet of the coal slurry-supercritical water mixer (2-4);
a supercritical water inlet of the coal slurry-supercritical water mixer (2-4) is connected with a supercritical water outlet of a coal-electric unit thermodynamic system (1) with supercritical and above parameters;
the slurry outlet of the coal slurry-supercritical water mixer (2-4) is connected with the slurry inlet of the supercritical reactor (2-5), the gas-solid mixture outlet of the supercritical reactor (2-5) is connected with the gas-solid separation device (2-7), and the hydrogen outlet of the gas-solid separation device (2-7) is connected with the hydrogen collecting device (2-8).
6. The supercritical water hydrogen production system based on coupling of supercritical and above parameters of a coal-electric unit as claimed in claim 5, characterized in that a high-pressure steam-driven coal slurry plunger pump (2-2) and a coal slurry heat regenerator (2-3) are sequentially arranged between the slurry outlet of the high-concentration coal slurry mixer (2-1) and the slurry inlet of the coal slurry-supercritical water mixer (2-4), wherein the steam inlet of the high-pressure steam-driven coal slurry plunger pump (2-2) is connected with the steam extraction outlet of the supercritical and above parameters coal-electric unit thermodynamic system (1).
7. The supercritical and above parameter coal electric unit coupled supercritical water hydrogen production system according to claim 5, characterized in that the supercritical reactor (2-5) is further connected with a high pressure catalyst mixer (2-6), and a water inlet of the high pressure catalyst mixer (2-6) is connected with a high pressure water outlet of the supercritical and above parameter coal electric unit thermodynamic system (1).
8. A supercritical and above parameter coal-electric unit coupling supercritical water hydrogen production method is characterized in that the system based on any one of claims 1-7 comprises the following steps:
feeding low-pressure medium-temperature water and coal powder in a coal-electricity unit thermodynamic system (1) with supercritical and above parameters into a supercritical and coupling hydrogen production system (2) for mixing to obtain low-pressure high-concentration coal slurry;
supercritical water in the coal-electricity unit thermodynamic system (1) with the parameters of supercritical and above is sent into a supercritical and coupling hydrogen production system (2) to be mixed with low-pressure high-concentration coal slurry to react to produce hydrogen.
9. The supercritical water hydrogen production method by coupling the coal-electric unit with the parameters above the supercritical water as claimed in claim 8, wherein the supercritical and coupled hydrogen production system stops operating when any one of the following conditions is satisfied:
the minimum coal feeding quantity of the high-concentration coal slurry mixer (2-1) corresponding to the minimum working power of the supercritical and coupling hydrogen production system is smaller than the difference between the maximum coal powder quantity of the coal pulverizing system (1-4) and the real-time coal powder quantity of the boiler (1-3) required by the boiler (1-3) in the operation of the thermodynamic system of the supercritical and above parameters coal-electric machine set;
the minimum water flow of the high-concentration coal slurry mixer (2-1) corresponding to the minimum working power of the supercritical and coupling hydrogen production system is smaller than the difference between the maximum pump water flow of the circulating water pump (1-9) and the real-time water flow required by the boiler (1-3) in the operation of the coal-electric set thermodynamic system with the supercritical and above parameters;
the minimum supercritical water flow of the coal slurry-supercritical water mixer (2-4) corresponding to the minimum working power of the supercritical and coupled hydrogen production system is less than the difference between the maximum continuous evaporation capacity of the boiler (1-3) and the required evaporation capacity corresponding to the real-time power of the high pressure cylinder (1-5) in the supercritical and above parameters coal-electric machine set thermodynamic system.
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