CN108487954B - Coal gas synergistic power generation system based on industrial dragging - Google Patents
Coal gas synergistic power generation system based on industrial dragging Download PDFInfo
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- CN108487954B CN108487954B CN201810097111.7A CN201810097111A CN108487954B CN 108487954 B CN108487954 B CN 108487954B CN 201810097111 A CN201810097111 A CN 201810097111A CN 108487954 B CN108487954 B CN 108487954B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K11/00—Plants characterised by the engines being structurally combined with boilers or condensers
- F01K11/02—Plants characterised by the engines being structurally combined with boilers or condensers the engines being turbines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/10—Adaptations for driving, or combinations with, electric generators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K23/00—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids
- F01K23/02—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled
- F01K23/06—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle
- F01K23/10—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle with exhaust fluid of one cycle heating the fluid in another cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
- F22D1/02—Feed-water heaters, i.e. economisers or like preheaters with water tubes arranged in the boiler furnace, fire tubes, or flue ways
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
- F22D1/50—Feed-water heaters, i.e. economisers or like preheaters incorporating thermal de-aeration of feed-water
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D11/00—Feed-water supply not provided for in other main groups
- F22D11/02—Arrangements of feed-water pumps
- F22D11/06—Arrangements of feed-water pumps for returning condensate to boiler
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22G—SUPERHEATING OF STEAM
- F22G7/00—Steam superheaters characterised by location, arrangement, or disposition
- F22G7/12—Steam superheaters characterised by location, arrangement, or disposition in flues
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K5/00—Feeding or distributing other fuel to combustion apparatus
- F23K5/002—Gaseous fuel
- F23K5/005—Gaseous fuel from a central source to a plurality of burners
Abstract
A coal gas efficiency-increasing power generation system based on industrial dragging comprises a coal gas pipe network, a first coal gas efficiency-increasing power generation system and a second coal gas efficiency-increasing power generation system, wherein the first coal gas efficiency-increasing power generation system comprises a low-parameter coal gas boiler and a low-parameter steam turbine, the second coal gas efficiency-increasing power generation system comprises a plurality of second coal gas efficiency-increasing power generation subsystems, each second coal gas efficiency-increasing power generation subsystem comprises a high-parameter coal gas boiler, a high-parameter first steam turbine, a high-parameter second steam turbine, a high-parameter first power generator, a high-parameter second power generator and a deaerator, and in the first coal gas efficiency-increasing power generation system, steam generated by the low-parameter coal gas boiler drives the low-parameter steam turbine to do work; in each second gas synergistic power generation subsystem, steam generated by the high-parameter gas boiler sequentially enters the high-parameter first steam turbine and the high-parameter second steam turbine to respectively drive the corresponding power generators to generate power.
Description
Technical Field
The invention relates to the technical field of efficient energy utilization, in particular to a coal gas synergistic power generation system based on industrial dragging.
Background
In the production processes in the fields of steel, coking and the like, a large number of high-power and high-energy-consumption rotary machines including fans, compressors, water pumps and the like exist as auxiliary facilities of process devices, and the rotary machines are main factors causing the power consumption of enterprises to be high. On the other hand, by-product gas such as blast furnace gas, converter gas, coke oven gas and the like can be generated in the production process of steel and iron and coking. In recent years, with the improvement of energy conservation and emission reduction consciousness and the improvement of technical capacity of various factories, a large number of factories adopt turbine dragging to replace the traditional motor dragging mode for driving the high-power rotating machines, the byproduct gas is sent into a boiler for combustion, the generated steam is used for driving the turbine and driving the rotating machines to do work, and the method has obvious economic benefit compared with the traditional motor driving mode.
In recent years, with the gradual expansion of plant capacity, under the trend of changing electric power into steam power, a plurality of plants have installation modes that the whole plant is built in stages and finally a plurality of low-parameter (such as medium-temperature and medium-pressure) boilers and low-parameter (such as medium-temperature and medium-pressure) industrial turbines are formed. However, both low-parameter boilers and low-parameter turbines have the disadvantages of low efficiency, high heat consumption and the like, so that the byproduct gas resources of a factory are not fully utilized. For example, ten medium-temperature and medium-pressure turbines are built in succession in a steel plant, steam is supplied by a plurality of medium-temperature and medium-pressure gas boilers, the actual operating efficiency of the medium-temperature and medium-pressure small-capacity boilers is only 82%, which is far lower than the thermal efficiency of the high-parameter large-capacity boilers, and in addition, the efficiency of the medium-temperature and medium-pressure turbines is also far lower than that of the high-parameter turbines, which leads to lower thermal efficiency of the whole plant and serious shortage of the utilization rate of heat energy of the byproduct gas. Therefore, related technicians always seek an effective modification way for improving the overall heat efficiency of the unit, but the industrial dragging steam turbine supplies energy to the most core process device at the upstream, so that the safe and stable operation of the turbine must be ensured, which is different from the conventional unit modification, so that how to construct a set of coal gas synergistic power generation scheme on the basis of unchanged original system and improve the utilization efficiency of coal gas resources is a problem generally concerned by various current factories, and the method has important practical significance.
Disclosure of Invention
The invention provides a coal gas synergistic power generation system based on industrial dragging.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a coal gas efficiency-increasing power generation system based on industrial dragging comprises a coal gas pipe network, a first coal gas efficiency-increasing power generation system and a second coal gas efficiency-increasing power generation system, wherein the first coal gas efficiency-increasing power generation system comprises a low-parameter coal gas boiler and a low-parameter steam turbine, the second coal gas efficiency-increasing power generation system comprises a plurality of second coal gas efficiency-increasing power generation subsystems, each second coal gas efficiency-increasing power generation subsystem comprises a high-parameter coal gas boiler, a high-parameter first steam turbine, a high-parameter second steam turbine, a high-parameter first power generator, a high-parameter second power generator and a deaerator, and the coal gas pipe network is respectively communicated with coal gas inlets of all the low-parameter coal gas boilers and all the high-parameter coal gas boilers and supplies fuel for the low-parameter coal gas boilers and/or the high-parameter coal gas boilers; in the first coal gas synergistic power generation system, a main steam outlet of a low-parameter coal gas boiler is communicated with a steam inlet of a corresponding low-parameter steam turbine; in each second coal gas synergistic power generation subsystem, a main steam outlet of the high-parameter coal gas boiler is communicated with a steam inlet of a high-parameter first steam turbine, a steam outlet of the high-parameter first steam turbine is communicated with a steam inlet of a high-parameter second steam turbine, and a steam outlet of the high-parameter second steam turbine is communicated with a steam inlet of a deaerator; the high-parameter first turbine is connected with the high-parameter first generator and drives the high-parameter first generator to generate electricity; and the high-parameter second turbine is connected with the high-parameter second generator and drives the high-parameter second generator to generate power, wherein the high-parameter first turbine and the high-parameter second turbine are both back pressure turbines.
Preferably, each second gas synergistic power generation subsystem further comprises a reheater, the reheater is arranged in a high-temperature flue of the high-parameter gas boiler, a steam outlet of the high-parameter first turbine is communicated with a steam inlet of the reheater, and a steam outlet of the reheater is communicated with a steam inlet of each low-parameter turbine and a steam inlet of the high-parameter second turbine.
Preferably, the first gas synergistic power generation system further comprises a low-parameter condenser and a low-parameter condensate pump, each second gas synergistic power generation subsystem further comprises a low-pressure economizer and a water feed pump, and the gas synergistic utilization system further comprises a condensate water tank and a condensate water booster pump, wherein a steam exhaust port of a low-parameter steam turbine in the first gas synergistic utilization system is sequentially communicated with the corresponding low-parameter condenser and the corresponding low-parameter condensate pump along the steam-water flow direction, is collected into a water inlet of the condensate water tank, and is respectively sequentially communicated with water inlets of the low-pressure economizer and the deaerator in the second gas synergistic power generation subsystems through a water outlet of the condensate water tank and the condensate water booster pumps; in each second coal gas efficiency-increasing power generation subsystem, a water outlet of the deaerator is communicated with a water inlet of the high-parameter coal gas boiler through the water feeding pump to supply water to the high-parameter coal gas boiler; the low-pressure economizer is arranged in a tail flue of the high-parameter gas boiler, and the waste heat of the flue gas of the tail flue is used as a heat source to heat condensed water in the low-pressure economizer.
Preferably, the coal gas synergistic power generation system further comprises a condensate water preheater, wherein the condensate water preheater is arranged between the condensate water booster pump and the low-pressure economizer on a steam-water flow path and is used for preheating condensate water from a condensate water tank; the steam inlet of the condensate water preheater is communicated with a low-pressure steam pipeline in a plant, and the condensate water preheater takes steam from the low-pressure steam pipeline in the plant as a heat source.
Preferably, the steam-gas separator further comprises a reheat steam collecting main pipe, wherein the steam outlet of each reheater is firstly communicated with the reheat steam collecting main pipe and then communicated with the steam inlet of each low-parameter steam turbine through the reheat steam collecting main pipe.
Preferably, the condensate water collection device further comprises a condensate water collection main pipe, wherein a water outlet of each low-parameter condensate water pump is communicated with the condensate water collection main pipe firstly, and then communicated with a water inlet of the condensate water tank through the condensate water collection main pipe.
Preferably, a main steam system between each high-parameter gas boiler and the corresponding high-parameter first steam turbine adopts a unit system, and a main steam outlet of each high-parameter gas boiler is communicated with a steam inlet of the corresponding high-parameter first steam turbine through a single steam pipeline; and a reheating steam system between each high-parameter gas boiler and the high-parameter first steam turbine is also in a unit system, and a steam inlet of a reheater of each high-parameter gas boiler is communicated with a steam outlet of the corresponding high-parameter first steam turbine through a single steam pipeline.
Preferably, the first coal gas efficiency-increasing utilization system is an original system of a factory, the second coal gas efficiency-increasing utilization system is a newly-built system of the factory, when the system is in normal operation, a low-parameter coal gas boiler in the original system is stopped, coal gas is replaced and supplied to the newly-built high-parameter coal gas boiler, steam generated by the high-parameter coal gas boiler is utilized by a high-parameter steam turbine and is sent to the low-parameter steam turbine in the original system after passing through a reheater, and the low-parameter steam turbine in the original system basically keeps in original operation; when a high-parameter steam turbine in a newly-built system breaks down, steam generated by a high-parameter gas boiler is subjected to temperature and pressure reduction treatment by a steam turbine bypass system and then is sent to a low-parameter steam turbine in an original system, and the low-parameter steam turbine in the original system basically keeps the original state to operate; when the high-parameter gas boiler in the newly-built system breaks down, the newly-built high-parameter gas boiler is shut down, the low-parameter gas boiler in the original system is put into operation, steam generated by the low-parameter gas boiler in the original system is supplied to the low-parameter steam turbine in the original system, and the whole set of first gas synergistic utilization system is recovered to operate as the original system.
Preferably, the low parameter turbine comprises one or both of an industrial drive unit for driving the working equipment and a generator unit for driving the generator, wherein the industrial drive unit is used for ensuring the normal operation of the upstream process facility, and the generator unit is used for balancing the surplus steam amount; the model selection capacity of the high-parameter gas boiler is larger than the capacity of the low-parameter industrial dragging unit; when the gas supply amount of the gas boiler is larger, the steam amount in the reheating main pipe is larger than the consumption amount of the low-parameter industrial dragging unit, and the redundant steam is sent to the generating unit for generating.
Preferably, the steam parameters of the low-parameter gas boiler and the high-parameter gas boiler have a corresponding relationship, and if the low-parameter gas boiler is a sub-high-temperature sub-high-pressure boiler, a medium-temperature medium-pressure boiler or a boiler with lower parameters, the high-parameter gas boiler is a high-temperature high-pressure boiler, a high-temperature ultrahigh-pressure boiler, an ultrahigh-temperature ultrahigh-pressure boiler or a boiler with higher parameters.
The coal gas synergistic power generation system based on industrial dragging has the following beneficial effects:
1) the coal gas synergistic power generation system based on industrial dragging is constructed, under the condition that no energy consumption is increased, the overall heat efficiency of the unit is greatly improved by increasing boiler parameters and additionally arranging a back-pressure steam turbine generator unit, the original low-parameter industrial dragging steam turbine of a factory is guaranteed to maintain the original operation, and the generated energy of a newly-built high-parameter back-pressure steam turbine generator unit is the main new gain of the system.
2) Aiming at the optimized design of a deoxidizing system, the invention adopts the exhaust steam of the first high-parameter turbine to supply the deoxidizing steam, and simultaneously considers that the pressure of the exhaust steam of the newly-built first high-parameter turbine is far higher than the working pressure of a deaerator, so that the steam pressure is reduced by the second high-parameter turbine to absorb the energy of high-grade steam, and then the low-pressure steam discharged by the newly-built second high-parameter turbine is used as the deoxidizing steam of the deaerator, compared with the conventional mode of supplying the deoxidizing steam by adopting the temperature and pressure reduction of the exhaust steam of the first high-parameter turbine, the invention has very obvious economic benefit.
3) The newly-built high-parameter first turbine and the newly-built high-parameter second turbine both adopt back pressure turbines and do not have a condensing system, and the whole set of steam-water thermodynamic system is greatly simplified compared with a conventional condensing unit, so that condensing equipment and pipelines are reduced, and the construction cost is greatly reduced; in addition, this patent steam turbine owner factory building arranges to compare with condensing steam type steam turbine owner factory building, arranges very simplification, and operation layer elevation and main factory building elevation all can suitably reduce to reduce the factory building construction cost.
4) The system provided by the invention also fully considers the change of the actual operation working condition so as to reduce energy waste and ensure the normal operation of the industrial dragging steam turbine, when the inlet gas volume of the newly-built high-parameter boiler is too high, the steam volume of the industrial dragging steam turbine is larger than the actual requirement, and the redundant steam is digested by a generator set in the original low-parameter steam turbine; when the inlet gas quantity of the newly-built high-parameter boiler is too low, the steam quantity of the industrial dragging steam turbine is smaller than the actual requirement, and at the moment, the air input of the newly-built high-parameter gas boiler of the system is ensured by shutting down the external gas users of the system or reducing the gas consumption of the external gas users, so that the normal operation of the industrial dragging steam turbine is ensured.
5) Compared with a conventional gas power generation system, the low-pressure economizer and the condensate water preheater are additionally arranged in the high-efficiency coal gas power generation system, wherein the low-pressure economizer reasonably utilizes the waste heat of the flue gas at the tail part of the boiler, so that the condensate water is preheated, the heat consumption of the deoxygenation system is reduced, the fuel consumption of the boiler is reduced, and the purpose of saving coal is achieved; the condensate water preheater utilizes low-pressure steam in a low-pressure steam pipeline in a plant to heat low-temperature condensate water at the outlet of the condenser, and improves the temperature of the condensate water at the inlet of the low-pressure economizer, so that the wall surface of the low-pressure economizer cannot be subjected to low-temperature acid corrosion, and the safe operation of the low-pressure economizer is ensured.
Drawings
The above features and technical advantages of the present invention will become more apparent and readily appreciated from the following description of the embodiments thereof taken in conjunction with the accompanying drawings.
Fig. 1 is a process flow diagram of an industrial drag-based coal gas synergistic power generation system according to an embodiment of the invention.
Detailed Description
Embodiments of the industrial haulage-based gas cogeneration system according to the present invention will be described with reference to the accompanying drawings. Those of ordinary skill in the art will recognize that the described embodiments can be modified in various different ways, or combinations thereof, without departing from the spirit and scope of the present invention. Accordingly, the drawings and description are illustrative in nature and not intended to limit the scope of the claims. Furthermore, in the present description, the drawings are not to scale and like reference numerals refer to like parts.
In the industrial-dragging-based gas synergistic power generation system, the low parameter and the high parameter mean that the first gas synergistic power generation system and the second gas synergistic power generation system are relatively speaking. Wherein the parameters refer to performance parameters such as pressure, temperature and the like. The low parameter gas boiler is a relatively high parameter gas boiler, and correspondingly, the low parameter gas boiler corresponds to a low parameter steam turbine and a low parameter generator. Corresponding to the high-parameter boiler are a high-parameter turbine and a high-parameter generator. The steam parameters of the low-parameter gas boiler and the high-parameter gas boiler may have a certain corresponding relationship, for example, if the low-parameter gas boiler is a sub-high temperature sub-high pressure boiler or a medium temperature medium pressure boiler or even a boiler with lower parameters, the high-parameter gas boiler may be a high temperature high pressure boiler, a high temperature ultra-high pressure boiler or an ultra-high temperature ultra-high pressure boiler or even a boiler with higher parameters.
The gas synergistic power generation system based on industrial dragging is described below with reference to fig. 1, which includes a gas pipe network 5, a first gas synergistic power generation system and a second gas synergistic power generation system, wherein,
the first gas efficiency-increasing power generation system comprises a plurality of first gas efficiency-increasing power generation subsystems, and each first gas efficiency-increasing power generation subsystem comprises a low-parameter gas boiler and a low-parameter steam turbine. As shown in fig. 1, the first gas efficiency-increasing power generation system includes N first gas efficiency-increasing power generation subsystems of a low-parameter gas boiler 1.1, a low-parameter steam turbine 2.1 to the low-parameter gas boiler 1.N, and the low-parameter steam turbine 2. N. In each first coal gas synergistic power generation subsystem, a main steam outlet of the low-parameter coal gas boiler is communicated with a steam inlet of a corresponding low-parameter steam turbine. As shown in fig. 1, the main steam outlet of the low parameter gas boiler 1.1 is in communication with the steam inlet of the low parameter steam turbine 2.1. The above is only an exemplary illustration, and in fact, the first gas efficiency-increasing utilization subsystem may be different, for example, some first gas efficiency-increasing utilization subsystems only have the low-parameter gas boiler, some first gas efficiency-increasing utilization subsystems only have the low-parameter turbine, and some first gas efficiency-increasing utilization subsystems have both the low-parameter gas boiler and the low-parameter turbine. That is, the low parameter gas boiler and the low parameter turbine are not in one-to-one correspondence. The first gas synergistic utilization system can adopt a main pipe system, namely outlet steam of a plurality of gas boilers is firstly collected together and then is respectively communicated with the steam inlets of the steam turbines. Or a unit system, namely the low-parameter gas boiler is correspondingly connected with the low-parameter steam turbine one by one.
The second gas-enhanced power generation system includes a plurality of second gas-enhanced power generation subsystems, and fig. 1 illustrates two second gas-enhanced power generation subsystems as an example, but the invention is not limited thereto. Each second coal gas synergistic power generation subsystem comprises a high-parameter coal gas boiler, a high-parameter first steam turbine, a high-parameter second steam turbine, a high-parameter first power generator, a high-parameter second power generator and a deaerator. As shown in fig. 1, the second gas efficiency-increasing power generation system comprises two second gas efficiency-increasing power generation subsystems, and one second gas efficiency-increasing power generation subsystem comprises a high-parameter gas boiler 6.1, a high-parameter first turbine 7.1, a high-parameter first power generator 8.1 connected with the high-parameter first turbine, a high-parameter second turbine 10.1, a high-parameter second power generator 11.1 connected with the high-parameter second turbine, and a deaerator 19.1. The other second gas efficiency-increasing power generation subsystem comprises a high-parameter gas boiler 6.2, a high-parameter first turbine 7.2, a high-parameter first power generator 8.2 connected with the high-parameter first turbine, a high-parameter second turbine 10.2, a high-parameter second power generator 11.2 connected with the high-parameter second turbine and a deaerator 19.2. And the high-parameter first turbine and the high-parameter second turbine are both back pressure turbines.
In each second coal gas synergistic power generation subsystem, a main steam outlet of the high-parameter coal gas boiler is communicated with a steam inlet of a high-parameter first steam turbine, a steam outlet of the high-parameter first steam turbine is communicated with a steam inlet of a high-parameter second steam turbine, and a steam outlet of the high-parameter second steam turbine is communicated with a steam inlet of a deaerator. As shown in fig. 1, a main steam outlet of the high-parameter gas boiler 6.1 is communicated with a steam inlet of a high-parameter first steam turbine 7.1, a steam outlet of the high-parameter first steam turbine 7.1 is communicated with a steam inlet of a high-parameter second steam turbine 10.1, and a steam outlet of the high-parameter second steam turbine 10.1 is communicated with a steam inlet of the deaerator 19.1.
The gas pipe network is respectively communicated with the gas inlets of all the low-parameter gas boilers and all the high-parameter gas boilers and supplies fuel for the low-parameter gas boilers and/or the high-parameter gas boilers.
According to the embodiment, under the condition that no energy consumption is increased, the coal gas synergistic power generation system based on industrial dragging is constructed by improving the boiler parameters and additionally arranging the back-pressure steam turbine generator unit, and the coal gas synergistic power generation system can be applied to system transformation of the current low-parameter coal gas boiler. The steam pressure is reduced through the second steam turbine, the high-grade steam energy is absorbed, then the low-pressure steam discharged by the second steam turbine is used as the steam for deoxidization of the deaerator, and compared with the conventional mode of supplying the deaerated steam by adopting the first steam turbine to reduce the temperature and the pressure, the economic benefit is very obvious.
The second gas efficiency-increasing utilization system is applied to the modification of a first gas efficiency-increasing utilization system (namely a system adopting a low-parameter gas boiler), the first gas efficiency-increasing utilization system is an original system of a factory, the second gas efficiency-increasing utilization system is a newly-built system of the factory, when the system is in normal operation, the low-parameter gas boiler in the original system is stopped, gas is replaced and supplied to the newly-built high-parameter gas boiler, steam generated by the high-parameter gas boiler is utilized by the high-parameter steam turbine and is reheated and then sent to the low-parameter steam turbine in the original system, and the low-parameter steam turbine in the original system basically keeps the original operation; when a high-parameter steam turbine in the newly-built system breaks down, steam generated by the high-parameter gas boiler is subjected to temperature and pressure reduction treatment by a steam turbine bypass system and then is sent to a low-parameter steam turbine in the original system, and the low-parameter steam turbine in the original system basically keeps the original state to operate; when the high-parameter gas boiler in the newly-built system breaks down, the newly-built high-parameter gas boiler is shut down, the low-parameter gas boiler in the original system is put into operation, steam generated by the low-parameter gas boiler in the original system is supplied to the low-parameter steam turbine in the original system, and the whole set of first gas synergistic utilization system is recovered to operate as the original system.
In an optional embodiment, in each second gas efficiency-increasing power generation subsystem, a reheater is further arranged in the high-temperature flue of the high-parameter gas boiler, the steam outlet of the high-parameter first steam turbine is firstly communicated with the steam inlet of the reheater, and the steam outlet of the reheater is then communicated with the steam inlet of the high-parameter second steam turbine. As shown in fig. 1, a reheater 9.1 is disposed in the high temperature flue of the high parameter gas boiler 6.1, the exhaust port of the high parameter first steam turbine 7.1 is first communicated with the steam inlet of the reheater 9.1, and the steam outlet of the reheater 9.1 is then communicated with the steam inlet of the high parameter second steam turbine 10.1. Similarly, a reheater 9.2 is arranged in the high-temperature flue of the high-parameter gas boiler 6.2, the steam outlet of the high-parameter first steam turbine 7.2 is firstly communicated with the steam inlet of the reheater 9.2, and the steam outlet of the reheater 9.2 is then communicated with the steam inlet of the high-parameter second steam turbine 10.2.
In an alternative embodiment, the outlet of each reheater is also in communication with the inlet of each low parameter turbine.
In an optional embodiment, the first coal gas synergistic power generation system further comprises a low-parameter condenser and a low-parameter condensate pump, as shown in fig. 1, the low-parameter condenser is 3.1 to 3.N, and the low-parameter condensate pump is 4.1 to 4. N. Each second coal gas synergistic power generation subsystem further comprises a low-pressure economizer and a water feeding pump, as shown in fig. 1, the low-pressure economizer 18.1 is arranged in a tail flue of the high-parameter coal gas boiler 6.1, and the waste heat of flue gas in the tail flue is used as a heat source to heat condensed water in the low-pressure economizer 18.1. Similarly, the low-pressure economizer 18.2 is arranged in a tail flue of the high-parameter gas boiler 6.2, and the waste heat of the flue gas in the tail flue is used as a heat source to preheat the condensed water in the low-pressure economizer 18.2. As shown in fig. 1, the deaerator 19.1 supplies water to the high parameter boiler 6.1 by means of a feed pump 20.1, and the deaerator 19.2 supplies water to the high parameter boiler 6.2 by means of a feed pump 20.2.
The coal gas synergistic power generation system is also provided with a condensed water tank 14 and a condensed water booster pump 15, wherein the steam outlet of each low-parameter steam turbine is sequentially communicated with the corresponding low-parameter condenser, the corresponding low-parameter condensed water pump and the water inlet of the condensed water tank along the steam-water flow direction, the water outlet of the condensed water tank is divided into a plurality of branches through the condensed water booster pump, and each branch is sequentially communicated with the water inlet of the corresponding low-pressure economizer and the water inlet of the deaerator. The water outlet of each deaerator is communicated with the water inlet of the corresponding high-parameter gas boiler through a respective water feeding pump to supply water to the high-parameter gas boiler.
In an optional embodiment, the coal gas synergistic power generation system further comprises a condensate water preheater 16, and the condensate water preheater 16 is arranged between the condensate water booster pump 15 and the low-pressure economizer in the steam-water flow path and is used for preheating condensate water from a condensate water tank. The steam inlet of the condensate water preheater is communicated with the low-pressure steam pipeline in the plant, and steam from the low-pressure steam pipeline in the plant is used as a heat source. As shown in fig. 1, the condensate preheater 16 heats the condensate using steam from a low pressure steam line 17 in the plant.
In an alternative embodiment, as shown in fig. 1, a condensate collection header 13 is also included. The water outlet of each low-parameter condensate pump is firstly communicated with the condensate collecting main pipe 13 and then communicated with the water inlet of the condensate tank 14 through the condensate collecting main pipe 13.
In an alternative embodiment, as shown in FIG. 1, a reheat steam collection header 12 is also included. The steam outlet of each reheater is firstly communicated with the reheat steam collecting main pipe 12 and then communicated with the steam inlet of each low-parameter steam turbine through the reheat steam collecting main pipe.
In an optional embodiment, a main steam system between the high-parameter gas boiler and the corresponding high-parameter first steam turbine adopts a unit system, and a main steam outlet of each high-parameter gas boiler is communicated with a steam inlet of the corresponding high-parameter first steam turbine through a single steam pipeline.
A reheating steam system between the high-parameter gas boiler and the high-parameter first steam turbine is also in a unit system, and a steam inlet of a reheater of each high-parameter gas boiler is communicated with a steam outlet of the corresponding high-parameter first steam turbine through an independent steam pipeline.
In an alternative embodiment, the low parameter turbine includes both types of industrial drive units for driving the work equipment and generator units for driving the generator. The low parameter turbine includes one or both of an industrial tractor unit for driving the work equipment and a generator unit for driving the generator. The industrial dragging unit is used for ensuring the normal operation of upstream process facilities, and the generator unit is used for balancing the surplus steam quantity; the model selection capacity of the high-parameter gas boiler is larger than the capacity of the low-parameter industrial dragging unit; when the gas supply amount of the gas boiler is larger, the steam amount in the reheating main pipe is larger than the consumption amount of the low-parameter industrial dragging unit, and the redundant steam is sent to the generating unit for generating.
The coal gas synergistic power generation system based on industrial dragging has the following beneficial effects:
1) the coal gas synergistic power generation system based on industrial dragging is constructed, under the condition that no energy consumption is increased, the overall heat efficiency of the unit is greatly improved by increasing boiler parameters and additionally arranging a back-pressure steam turbine generator unit, the original low-parameter industrial dragging steam turbine of a factory is guaranteed to maintain the original operation, and the generated energy of a newly-built high-parameter back-pressure steam turbine generator unit is the main new gain of the system.
2) Aiming at the optimized design of a deoxidizing system, the invention adopts the exhaust steam of the first high-parameter turbine to supply the deoxidizing steam, and simultaneously considers that the pressure of the exhaust steam of the newly-built first high-parameter turbine is far higher than the working pressure of a deaerator, so that the steam pressure is reduced by the second high-parameter turbine to absorb the energy of high-grade steam, and then the low-pressure steam discharged by the newly-built second high-parameter turbine is used as the deoxidizing steam of the deaerator, compared with the conventional mode of supplying the deoxidizing steam by adopting the temperature and pressure reduction of the exhaust steam of the first high-parameter turbine, the invention has very obvious economic benefit.
3) The newly-built high-parameter first turbine and the newly-built high-parameter second turbine both adopt back pressure turbines and do not have a condensing system, and the whole set of steam-water thermodynamic system is greatly simplified compared with a conventional condensing unit, so that condensing equipment and pipelines are reduced, and the construction cost is greatly reduced; in addition, this patent steam turbine owner factory building arranges to compare with condensing steam type steam turbine owner factory building, arranges very simplification, and operation layer elevation and main factory building elevation all can suitably reduce to reduce the factory building construction cost.
4) The system provided by the invention also fully considers the change of the actual operation working condition so as to reduce energy waste and ensure the normal operation of the industrial dragging steam turbine, when the inlet gas volume of the newly-built high-parameter boiler is too high, the steam volume of the industrial dragging steam turbine is larger than the actual requirement, and the redundant steam is digested by a generator set in the original low-parameter steam turbine; when the inlet gas quantity of the newly-built high-parameter boiler is too low, the steam quantity of the industrial dragging steam turbine is smaller than the actual requirement, and at the moment, the air input of the newly-built high-parameter gas boiler of the system is ensured by shutting down the external gas users of the system or reducing the gas consumption of the external gas users, so that the normal operation of the industrial dragging steam turbine is ensured.
5) Compared with a conventional gas power generation system, the low-pressure economizer and the condensate water preheater are additionally arranged in the high-efficiency coal gas power generation system, wherein the low-pressure economizer reasonably utilizes the waste heat of the flue gas at the tail part of the boiler, so that the condensate water is preheated, the heat consumption of the deoxygenation system is reduced, the fuel consumption of the boiler is reduced, and the purpose of saving coal is achieved; the condensate water preheater utilizes low-pressure steam in a low-pressure steam pipeline in a plant to heat low-temperature condensate water at the outlet of the condenser, and improves the temperature of the condensate water at the inlet of the low-pressure economizer, so that the wall surface of the low-pressure economizer cannot be subjected to low-temperature acid corrosion, and the safe operation of the low-pressure economizer is ensured.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A gas synergistic power generation system based on industrial dragging is characterized by comprising a gas pipe network, a first gas synergistic power generation system and a second gas synergistic power generation system, wherein,
the first gas synergistic power generation system comprises a low-parameter gas boiler and a low-parameter steam turbine,
the second gas efficiency-increasing power generation system comprises a plurality of second gas efficiency-increasing power generation subsystems, each second gas efficiency-increasing power generation subsystem comprises a high-parameter gas boiler, a high-parameter first steam turbine, a high-parameter second steam turbine, a high-parameter first generator, a high-parameter second generator and a deaerator,
the gas pipe network is respectively communicated with the gas inlets of all the low-parameter gas boilers and all the high-parameter gas boilers and supplies fuel for the low-parameter gas boilers and/or the high-parameter gas boilers;
in the first coal gas synergistic power generation system, a main steam outlet of a low-parameter coal gas boiler is communicated with a steam inlet of a corresponding low-parameter steam turbine;
in each second coal gas synergistic power generation subsystem, a main steam outlet of the high-parameter coal gas boiler is communicated with a steam inlet of a high-parameter first steam turbine, a steam outlet of the high-parameter first steam turbine is communicated with a steam inlet of a high-parameter second steam turbine, and a steam outlet of the high-parameter second steam turbine is communicated with a steam inlet of a deaerator;
the high-parameter first turbine is connected with the high-parameter first generator and drives the high-parameter first generator to generate electricity;
the high-parameter second turbine is connected with the high-parameter second generator and drives the high-parameter second generator to generate power,
wherein the high parameter first turbine and the high parameter second turbine are both back pressure turbines,
wherein the first coal gas synergistic utilization system is an original system of a factory, the second coal gas synergistic utilization system is a newly built system of the factory,
when the system normally operates, the low-parameter gas boiler in the original system is shut down, gas is replaced and supplied to a newly-built high-parameter gas boiler, steam generated by the high-parameter gas boiler is utilized by a high-parameter turbine and is sent to a low-parameter turbine in the original system after passing through a reheater, and the low-parameter turbine in the original system basically keeps the original operation;
when a high-parameter steam turbine in a newly-built system breaks down, steam generated by a high-parameter gas boiler is subjected to temperature and pressure reduction treatment by a steam turbine bypass system and then is sent to a low-parameter steam turbine in an original system, and the low-parameter steam turbine in the original system basically keeps the original state to operate;
when the high-parameter gas boiler in the newly-built system breaks down, the newly-built high-parameter gas boiler is shut down, the low-parameter gas boiler in the original system is put into operation, steam generated by the low-parameter gas boiler in the original system is supplied to the low-parameter steam turbine in the original system, and the whole set of first gas synergistic utilization system is recovered to operate as the original system.
2. The industrial drag based gas fired power generation system of claim 1,
each second coal gas synergistic power generation subsystem also comprises a reheater,
the reheater is arranged in a high-temperature flue of the high-parameter gas boiler, a steam outlet of the high-parameter first steam turbine is communicated with a steam inlet of the reheater, and a steam outlet of the reheater is communicated with a steam inlet of each low-parameter steam turbine and a steam inlet of the high-parameter second steam turbine.
3. The industrial drag based gas fired power generation system of claim 2,
the first coal gas synergistic power generation system also comprises a low-parameter condenser and a low-parameter condensate pump,
each second coal gas synergistic power generation subsystem also comprises a low-pressure economizer and a water feeding pump,
the coal gas synergistic utilization system also comprises a condensed water tank and a condensed water booster pump,
the steam outlet of the low-parameter steam turbine in the first coal gas synergistic utilization system is sequentially communicated with the corresponding low-parameter condenser and the corresponding low-parameter condensate pump along the steam-water flow direction, and the steam outlet of the low-parameter steam turbine is collected into the water inlet of the condensate water tank and is respectively sequentially communicated with the water inlets of the low-pressure economizer and the deaerator in the second coal gas synergistic power generation subsystem through the water outlet of the condensate water tank and the condensate water booster pump;
in each second coal gas efficiency-increasing power generation subsystem, a water outlet of the deaerator is communicated with a water inlet of the high-parameter coal gas boiler through the water feeding pump to supply water to the high-parameter coal gas boiler;
the low-pressure economizer is arranged in a tail flue of the high-parameter gas boiler, and the waste heat of the flue gas of the tail flue is used as a heat source to heat condensed water in the low-pressure economizer.
4. The industrial haulage-based gas fired cogeneration system of claim 3, further comprising a condensate preheater,
the condensate water preheater is arranged between the condensate water booster pump and the low-pressure economizer on a steam-water flow and is used for preheating low-temperature condensate water from the condensate water tank;
the steam inlet of the condensate water preheater is communicated with a low-pressure steam pipeline in a plant, and the condensate water preheater takes steam from the low-pressure steam pipeline in the plant as a heat source.
5. The industrial drag based gas synergistic power generation system of claim 4,
also comprises a reheat steam collecting main pipe, wherein,
and the steam outlet of each reheater is firstly communicated with the reheat steam collecting main pipe and then communicated with the steam inlet of each low-parameter steam turbine through the reheat steam collecting main pipe.
6. The industrial drag based gas synergistic power generation system of claim 5,
also comprises a condensed water collecting main pipe, wherein,
the water outlet of each low-parameter condensate pump is communicated with the condensate collecting main pipe firstly and then communicated with the water inlet of the condensate tank through the condensate collecting main pipe.
7. The industrial drag based gas fired power generation system of claim 1,
a main steam system between each high-parameter gas boiler and the corresponding high-parameter first steam turbine is in a unit system, and a main steam outlet of each high-parameter gas boiler is communicated with a steam inlet of the corresponding high-parameter first steam turbine through a single steam pipeline;
and a reheating steam system between each high-parameter gas boiler and the high-parameter first steam turbine is also in a unit system, and a steam inlet of a reheater of each high-parameter gas boiler is communicated with a steam outlet of the corresponding high-parameter first steam turbine through a single steam pipeline.
8. The industrial drag based gas fired cogeneration system of claim 1, wherein the low parameter steam turbine comprises one or both of an industrial drag unit for driving the working equipment and a generator unit for driving the generator,
the industrial dragging unit is used for ensuring the normal operation of upstream process facilities, and the generator unit is used for balancing the surplus steam quantity;
the model selection capacity of the high-parameter gas boiler is larger than the capacity of the low-parameter industrial dragging unit;
when the gas supply amount of the gas boiler is larger, the steam amount in the reheating main pipe is larger than the consumption amount of the low-parameter industrial dragging unit, and the redundant steam is sent to the generating unit for generating.
9. The industrial drag-based gas synergistic power generation system according to claim 1, wherein the steam parameters of the low-parameter gas boiler and the high-parameter gas boiler have a corresponding relationship, and if the low-parameter gas boiler is a sub-high temperature and sub-high pressure boiler, a medium temperature and medium pressure boiler or a boiler with lower parameters, the high-parameter gas boiler is a high temperature and high pressure boiler, a high temperature and ultra-high pressure boiler, or a boiler with higher parameters.
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| CN102080582A (en) * | 2010-12-06 | 2011-06-01 | 南京凯盛开能环保能源有限公司 | Coal-fired power generation and waste heat power generation coupling system for private station of cement kiln |
| KR20120037224A (en) * | 2010-10-11 | 2012-04-19 | 현대중공업 주식회사 | Hybrid of Solar Thermal Power Plant and Fossil Fuel Boiler |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR20120037224A (en) * | 2010-10-11 | 2012-04-19 | 현대중공업 주식회사 | Hybrid of Solar Thermal Power Plant and Fossil Fuel Boiler |
| CN102080582A (en) * | 2010-12-06 | 2011-06-01 | 南京凯盛开能环保能源有限公司 | Coal-fired power generation and waste heat power generation coupling system for private station of cement kiln |
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