CN108487955B - Coal gas efficiency-increasing utilization system based on steam parameter promotion - Google Patents
Coal gas efficiency-increasing utilization system based on steam parameter promotion Download PDFInfo
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- CN108487955B CN108487955B CN201810097169.1A CN201810097169A CN108487955B CN 108487955 B CN108487955 B CN 108487955B CN 201810097169 A CN201810097169 A CN 201810097169A CN 108487955 B CN108487955 B CN 108487955B
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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
- F01D15/08—Adaptations for driving, or combinations with, pumps
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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
- F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
- F01K7/16—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being only of turbine type
- F01K7/22—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being only of turbine type the turbines having inter-stage steam heating
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B33/00—Steam-generation plants, e.g. comprising steam boilers of different types in mutual association
- F22B33/18—Combinations of steam boilers with other apparatus
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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
- F22D1/32—Feed-water heaters, i.e. economisers or like preheaters arranged to be heated by steam, e.g. bled from turbines
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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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Abstract
The invention provides a gas synergistic utilization system based on steam parameter promotion, which comprises an original power system and a newly-built power generation system, wherein the original power system comprises an original gas boiler and an original steam turbine, the newly-built power generation system comprises a newly-built first steam turbine, a newly-built first generator and at least one gas power generation unit, the gas power generation unit comprises a newly-built gas boiler, a newly-built second steam turbine, a newly-built third steam turbine, a newly-built second generator, a reheater and a deaerator, a steam outlet of the newly-built gas boiler is communicated with a steam inlet of the newly-built second steam turbine, and a steam outlet of the newly-built second steam turbine is communicated with a steam inlet of the reheater; the reheater is arranged in the flue of the newly-built gas boiler, and the steam outlet of the reheater is respectively communicated with the steam inlet of the original steam turbine, the steam inlet of the newly-built first steam turbine and the steam inlet of the newly-built third steam turbine; the steam outlet of the newly-built third steam turbine is communicated with the steam inlet of the deaerator, and the water outlet of the deaerator is communicated with the water inlet of the newly-built gas boiler.
Description
Technical Field
The invention relates to the technical field of efficient energy utilization, in particular to a coal gas synergistic utilization system based on steam parameter promotion.
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. For this reason, the related art is always seeking an effective modification way for improving the overall thermal efficiency of the unit, but since the industrial dragging steam turbine supplies energy to the most core process device at the upstream, the safe and stable operation of the steam turbine must be ensured, which is different from the conventional unit modification.
Disclosure of Invention
The invention is made to solve the technical problems in the prior art, and an object of the invention is to provide a coal gas synergistic utilization system and method based on steam parameter improvement, which improve the utilization efficiency of coal gas resources on the basis of no change of the original system.
According to one aspect of the invention, a gas synergistic utilization system based on steam parameter improvement is provided, which comprises an original power system and a newly-built power generation system, wherein the original power system and the newly-built power generation system are communicated with each other, the original power system comprises at least one original gas boiler and at least one original steam turbine, a steam outlet of the original gas boiler is communicated with a steam inlet of the original steam turbine, the newly-built power generation system comprises a newly-built first steam turbine, a newly-built first power generator and at least one gas power generation unit, and the gas power generation unit comprises: newly-built gas boiler, newly-built second steam turbine, newly-built third steam turbine, newly-built second generator, re-heater, oxygen-eliminating device and feed pump, wherein: the newly-built gas power generation unit is connected with the original power system through a gas pipe network, and the gas pipe network is respectively communicated with a gas inlet of the original gas boiler and a gas inlet of the newly-built gas boiler to supply fuel for the original gas boiler and the newly-built gas boiler; the steam outlet of the newly-built gas boiler is communicated with the steam inlet of the newly-built second steam turbine, and the steam outlet of the newly-built second steam turbine is communicated with the steam inlet of the reheater; the reheater is arranged in a flue of the newly-built gas boiler, a steam outlet of the reheater is respectively communicated with a steam inlet of the original steam turbine, a steam inlet of the newly-built first steam turbine and a steam inlet of the newly-built third steam turbine, and steam is supplied to the original steam turbine, the newly-built first steam turbine and the newly-built third steam turbine; the steam outlet of the newly-built third steam turbine is communicated with the steam inlet of the deaerator to provide deaerated steam for the deaerator, and the water outlet of the deaerator is communicated with the water inlet of the newly-built gas boiler through the water feed pump to supply water to the newly-built gas boiler; the newly-built second turbine and the newly-built third turbine are back pressure turbines; the newly-built second turbine is coaxially connected with the newly-built third turbine and drives the newly-built second generator to generate power together; and the newly-built first turbine drives the newly-built first generator to generate power.
The coal gas synergistic utilization system is characterized in that the coal gas power generation unit of the newly-built power generation system further comprises a low-pressure economizer, the original power system further comprises an original condenser connected with the original turbine, and the original turbine and the original condenser of the original coal gas power system are sequentially communicated with the water inlets of the low-pressure economizer and the deaerator of the coal gas power generation unit; the low-pressure economizer is arranged in a tail flue of the newly-built gas boiler, and the waste heat of the flue gas of the tail flue is used as a heat source to heat the condensed water of the low-pressure economizer.
The coal gas synergistic utilization system comprises a newly-built power generation system and is characterized by further comprising a condensate water preheater, wherein a water inlet and a water outlet of the condensate water preheater are respectively communicated with a water outlet of the original condenser and a water inlet of the low-pressure economizer, and the condensate water at an outlet of the original condenser is preheated by the condensate water preheater so as to improve the temperature of the condensate water at an inlet of the low-pressure economizer and prevent the wall surface of the low-pressure economizer from low-temperature corrosion.
The coal gas synergistic utilization system is characterized in that a steam inlet of the condensed water preheater is communicated with a plant low-pressure steam pipeline, and the condensed water preheater preheats condensed water in the condensed water preheater by taking steam from the plant low-pressure steam pipeline as a heat source. The coal gas increases efficiency and utilizes the system, wherein, newly-built power generation system still includes newly-built condenser, newly-built condensate pump and condensate tank and the condensate booster pump of being connected with newly-built first turbine, original driving system still includes the original condensate pump of being connected with original condenser, the steam outlet and the water inlet of newly-built condenser, newly-built condensate pump, condensate tank of newly-built first turbine of coal gas increases efficiency and utilizes the system communicate along the soda flow direction in order, the water inlet of original condenser, original condensate pump, the condensate tank of original driving system also communicates along the soda flow direction in order, the water outlet of condensate tank communicates in proper order with the low pressure economizer of a plurality of coal gas power generation unit, the water inlet of oxygen-eliminating device through the condensate booster pump.
The coal gas synergistic utilization system is characterized in that the newly-built power generation system further comprises a condensed water collecting main pipe, a steam exhaust port of the original steam turbine is sequentially communicated with a water inlet of the original condenser, the original condensed water pump, the condensed water collecting main pipe and a water inlet of the condensed water tank along the steam-water flow direction, and a water outlet of the original condensed water pump is communicated with the condensed water collecting main pipe and then communicated with the water inlet of the condensed water tank through the condensed water collecting main pipe.
The coal gas synergistic utilization system is characterized in that the newly-built power generation system further comprises a steam collecting main pipe, and after a steam outlet of a reheater of each coal gas power generation unit is communicated with the steam collecting main pipe, the steam outlet of the reheater of each coal gas power generation unit is respectively communicated with a steam inlet of the original steam turbine and a steam inlet of the newly-built first steam turbine through the steam collecting main pipe.
In the coal gas synergistic utilization system, in a plurality of coal gas power generation units, a main steam system between the newly-built coal gas boiler and the newly-built second steam turbine and a main steam system between the newly-built third steam turbine are in a unit system, and a main steam outlet of each newly-built coal gas boiler is communicated with a steam inlet of the corresponding newly-built second steam turbine through an independent steam pipeline; and a reheat steam system between the newly-built gas boiler and the newly-built second steam turbine is also made of units, and a reheat steam inlet of each newly-built gas boiler is communicated with a steam outlet of the corresponding newly-built second steam turbine through an independent steam pipeline.
The coal gas synergistic utilization system is characterized in that steam parameters of a newly-built coal gas boiler of the coal gas power generation unit are higher than steam parameters of an original coal gas boiler of an original power system.
According to another aspect of the invention, a coal gas synergistic power generation method based on steam parameter improvement is provided, and comprises the following steps: during normal operation, the original gas boiler in the original power system is shut down, the replaced gas is supplied to the newly-built gas boiler, steam generated by the newly-built gas boiler is utilized by the newly-built second steam turbine and is reheated by the reheater and then is respectively sent to the original steam turbine, the newly-built first steam turbine and the newly-built third steam turbine in the original power system, and the original steam turbine in the original power system is kept in the original operation; a first steam turbine is newly built to drive a newly built first generator to generate power, a second steam turbine and a third steam turbine are newly built to drive a newly built second generator to generate power together, and the generated energy of the newly built first generator and the newly built second generator is the newly increased income of the coal gas synergistic power generation system promoted based on steam parameters under the condition of the same coal gas consumption; when the amount of coal gas at the inlet of the newly-built gas boiler fluctuates, the amount of steam supplied by the newly-built gas boiler also changes, and at the moment, the newly-built first steam turbine can absorb the steam fluctuation to balance the steam amount; when a newly-built second steam turbine in a newly-built power generation system breaks down, steam generated by a newly-built gas boiler is subjected to temperature and pressure reduction treatment by a steam turbine bypass system and then is sent to an original steam turbine in an original power system, and the original steam turbine in the original power system is kept in the original operation; when the newly-built gas boiler in the newly-built power generation system breaks down, the newly-built gas boiler is shut down, the original gas boiler in the original power system is put into operation, steam generated by the original gas boiler in the original power system is supplied to the original steam turbine in the original power system, and the whole original power system is recovered to be operated.
The invention has the beneficial effects that:
1) the coal gas efficiency-increasing utilization system based on steam parameter lifting is constructed, under the condition that no energy consumption is increased, the boiler parameters are lifted, the turbo generator unit is additionally arranged, the overall heat efficiency of the unit is greatly improved, the original industry of a factory is guaranteed to drag a steam turbine to operate in an original state, and the generated energy of the turbo generator unit of the coal gas power generation unit is the main new gain of the system.
2) The change of the actual operation condition is fully considered, the flexibility of the unit adjustment is increased by arranging the first steam turbine generator, so that the unit has the gas balance and adjustment capability, the fluctuation of the steam quantity caused by the change of the fuel quantity of the gas boiler is adapted, namely, when the gas quantity at the inlet of the gas boiler is changed, the finally supplied steam quantity is also changed, and if a newly-built first steam turbine is not arranged, the steam supply quantity and the steam consumption quantity of the system can not be balanced, so that the flexibility of the system adjustment is poor. The invention is particularly suitable for the situation that other gas users replace the gas or the newly increased gas amount caused by the expansion of the factory capacity is supplied to the system of the invention besides the gas consumed by the gas boiler corresponding to the industrial dragging steam turbine.
3) Aiming at the optimized design of a deoxidizing system, the invention adopts the newly-built second turbine to exhaust steam to supply deoxidizing steam, and simultaneously considers that the pressure of the newly-built second turbine exhaust steam is far higher than the working pressure of a deaerator, so that the steam pressure is reduced through the newly-built third turbine, the high-grade steam energy is absorbed, and then the low-pressure steam discharged by the newly-built third turbine is used as the deoxidizing steam of the deaerator, compared with the conventional mode of adopting the newly-built second turbine to exhaust steam for temperature reduction and pressure reduction to supply deoxidizing steam, the economic benefit is very obvious.
4) Compared with a conventional gas power generation system, the low-pressure economizer is additionally arranged, wherein the low-pressure economizer reasonably utilizes the waste heat of the flue gas at the tail of the boiler, realizes the preheating of condensed water, reduces the heat consumption of an oxygen removal system, reduces the fuel consumption of the boiler and achieves the purpose of saving coal; the condensate water preheater utilizes low-pressure steam in a low-pressure steam pipeline of a plant area 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
Other objects and results of the present invention will be more apparent and readily appreciated by reference to the following detailed description taken in conjunction with the accompanying drawings. In the drawings:
FIG. 1 is a schematic diagram of the coal gas synergistic utilization system based on steam parameter lifting.
Detailed Description
In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of one or more embodiments. It may be evident, however, that such embodiment(s) may be practiced without these specific details.
Various embodiments according to the present invention will be described in detail below with reference to the accompanying drawings.
FIG. 1 is a schematic diagram of the coal gas efficiency-increasing utilization system based on steam parameter promotion, as shown in FIG. 1, the coal gas power generation efficiency-increasing system based on steam parameter promotion comprises a newly-built power generation system and an original power system,
the original power system comprises at least one original gas boiler 1 and at least one original steam turbine 2,
the newly-built power generation system comprises a newly-built first steam turbine 12, a newly-built first power generator 13 and at least one coal gas power generation unit, wherein the coal gas power generation unit comprises: newly building a gas boiler 6, a second steam turbine 7, a third steam turbine 9, a second generator 10, a reheater 8, a deaerator 21 and a feed pump 22, wherein:
the steam outlet of the newly-built gas boiler 6 is communicated with the steam inlet of the newly-built second steam turbine 7, and the steam outlet of the newly-built second steam turbine 7 is communicated with the steam inlet of the reheater 8;
the reheater 8 is arranged in a flue of the newly-built gas boiler 6, a steam outlet of the reheater 8 is respectively communicated with a steam inlet of the original steam turbine 2, a steam inlet of the newly-built first steam turbine 12 and a steam inlet of the newly-built third steam turbine 9, and steam is respectively supplied to the original steam turbine 2, the newly-built first steam turbine 12 and the newly-built third steam turbine 9;
the steam outlet of the newly-built third turbine 9 is communicated with the steam inlet of the deaerator 21 to provide deaerated steam for the deaerator 21, and the water outlet of the deaerator 21 is communicated with the water inlet of the newly-built gas boiler 6 through the water feed pump 22 to supply water to the newly-built gas boiler 6;
the newly-built second steam turbine 7 and the newly-built third steam turbine 9 are back pressure steam turbines and condensing steam turbines;
the newly-built second turbine 7 is coaxially connected with a newly-built third turbine 9 and drives a newly-built second generator to generate power 10;
the newly-built first turbine 12 drives the newly-built first generator 13 to generate electricity;
the newly-built power generation system is connected with the original power system through a gas pipe network 5, wherein the gas pipe network 5 is not only communicated with a gas inlet of an original gas boiler 1 in the original power system to supply fuel for the original gas boiler 1, but also communicated with a gas inlet of a newly-built gas boiler 6 in the newly-built power generation system to supply fuel for the newly-built gas boiler;
the newly-built power generation system is connected with the original power system through a steam pipeline, wherein a steam outlet of a reheater 8 in the newly-built gas power generation unit is respectively communicated with steam inlets of the original steam turbine 2 and the newly-built first steam turbine 12, and a driving steam source is provided for the original steam turbine 2 and the newly-built first steam turbine 12.
The original power system also comprises an original condenser 2 connected with the original steam turbine 1, in order to reasonably utilize the waste heat of the flue gas at the tail part of the boiler and reduce the heat consumption of a deoxygenation system, thereby reducing the fuel consumption of the boiler and achieving the purpose of saving coal, the coal gas power generation unit also comprises a low-pressure economizer 20, and the original steam turbine 2 and the original condenser 3 of the original coal gas power system are sequentially communicated with the water inlets of the low-pressure economizer 20 and the deoxygenator 21 of the coal gas power generation unit; the low-pressure economizer 20 is arranged in a tail flue of the newly-built gas boiler 6, and the waste heat of the flue gas of the tail flue is used as a heat source to heat the condensed water at the water inlet side of the low-pressure economizer 20.
Further preferably, newly-built power generation system still includes condensate preheater 19, the water inlet, the delivery port of condensate preheater 19 respectively with the delivery port of original condenser 3, the water inlet intercommunication of low pressure economizer, condensate preheater 19 preheats the condensate water of original condenser export to improve the condensate water temperature of low pressure economizer 20 entry, make low pressure economizer 20's wall not receive the low temperature corrosion, condensate preheater 19's steam inlet and factory low pressure steam pipeline intercommunication, condensate preheater 19 preheats the condensate water with the steam that factory low pressure steam pipeline came as the heat source. The coal gas synergistic utilization system also comprises a newly-built condenser 14, a newly-built condensate water pump 15, a condensate water tank 17 and a condensate water booster pump 18, the original power system also comprises an original condenser 3 and an original condensate water pump 4 which are matched with the original steam turbine 2, a steam exhaust port of the newly-built first steam turbine 12 of the coal gas synergistic utilization system is sequentially communicated with water inlets of the newly-built condenser 14, the newly-built condensate water pump 15 and the condensate water tank 17 along the steam-water flow direction, the original condenser 3, the original condensate water pump 4 and the condensate water tank 17 of the original power system are also sequentially communicated along the steam-water flow direction, and a water outlet of the condensate water tank 17 is sequentially communicated with water inlets of low-pressure coal economizers 20 and deaerators 21 of a plurality of coal gas power generation units through the condensate water booster pump 18.
Further preferably, the coal gas synergistic utilization system further comprises a condensed water collecting main pipe 16, the steam outlet of the original steam turbine 2 is sequentially communicated with the water inlets of the original condenser 3, the original condensed water pump 4, the condensed water collecting main pipe 16 and the condensed water tank 17 along the steam-water flow direction, and the water outlet of the original condensed water pump 4 is communicated with the condensed water collecting main pipe 16 and then communicated with the water inlet of the condensed water tank 17 through the condensed water collecting main pipe 16.
Preferably, the system further comprises a steam collecting main pipe 11, and after a steam outlet of the reheater 8 of each gas power generation unit is communicated with the steam collecting main pipe 11, the steam outlet is respectively communicated with a steam inlet of the original steam turbine 2 and a steam inlet of the newly-built first steam turbine 12 through the steam collecting main pipe 11.
In a specific embodiment of the present invention, as shown in fig. 1, the number of the original gas boilers is multiple (1.1-1. N), the gas power generation system based on steam parameter promotion includes two gas power generation units, and the number of the newly-built gas boilers is two (6.1-6.2);
the number of the original turbines is multiple (2.1-2. N), one new-built first turbine is provided, and two new-built second turbines and two new-built third turbines are provided (7.1-7.2 and 9.1-9.2);
the steam system between the newly-built gas boiler and the newly-built second steam turbine is in a unit system, and a main steam outlet of each newly-built gas boiler (6.1-6.2) is communicated with a steam inlet of the corresponding newly-built second steam turbine (7.1-7.2) through an independent steam pipeline;
a reheat steam system between the newly-built gas boilers (6.1-6.2) and the newly-built second steam turbines (7.1-7.2) is also made of units, and reheat steam inlets of the newly-built gas boilers (6.1-6.2) are communicated with steam outlets of the corresponding newly-built second steam turbines (7.1-7.2) through independent steam pipelines;
a steam system between the newly-built gas boilers (6.1-6.2) and the original turbines (2.1-2. N) adopts a main pipe system, and steam outlets of the newly-built gas boilers (6.1-6.2) are firstly communicated with the steam collecting main pipe 11 and then are respectively communicated with steam inlets of the original turbines (2.1-2. N) through the steam collecting main pipe 11.
In the above embodiments, the steam parameters of the newly-built gas boiler 6 of the gas power generation unit have a certain corresponding relationship with the steam parameters of the original gas boiler 1 of the original power system, and the steam parameters of the newly-built gas boiler 6 of the gas power generation unit are higher than the steam parameters of the original gas boiler 1 of the original power system, for example, if the original gas boiler 1 is a sub-high temperature and sub-high pressure boiler or a medium temperature and medium pressure boiler, or even a boiler with lower parameters, the newly-built gas boiler 6 of the gas power generation unit can be a high temperature and high pressure boiler, a high temperature and ultra high pressure boiler or an ultra high temperature and ultra high pressure boiler; the parameters of the newly-built second turbine 7 are higher than the parameters of the original turbine 2, and if the original turbine 2 is a second-high-temperature second-high-pressure turbine, a medium-temperature medium-pressure turbine or a turbine with lower parameters, the newly-built second turbine 7 is a high-temperature high-pressure turbine, a high-temperature ultrahigh-pressure turbine, an ultrahigh-temperature ultrahigh-pressure turbine or a turbine with higher parameters.
The coal gas synergistic power generation method of the coal gas synergistic utilization system based on steam parameter improvement comprises the following steps:
during normal operation, the original gas boiler 1 with low parameters in the original power system is shut down, gas is replaced and supplied to the newly-built gas boiler 6 with high parameters, steam generated by the newly-built gas boiler 6 is utilized by the newly-built second turbine 7 with high parameters and is reheated by the reheater 8, and then is respectively sent to the original turbine 2 with low parameters, the newly-built first turbine 12 and the newly-built third turbine 9 in the original power system, and the original turbine 2 with low parameters in the original power system basically keeps the original operation; a newly-built first steam turbine 12 drives a newly-built first generator 13 to generate electricity, a newly-built second steam turbine 7 and a newly-built third steam turbine 9 drive a newly-built generator 10 together to generate electricity, and the generated energy of the first generator 13 and the newly-built second generator 10 is the newly-added benefit of the coal gas synergistic power generation system based on steam parameter promotion under the condition of the same coal gas consumption;
when the amount of the coal gas at the inlet of the newly-built gas boiler 6 fluctuates, the amount of the steam supplied by the newly-built gas boiler 6 also fluctuates, and at the moment, the steam fluctuation is absorbed by the newly-built first steam turbine 12 so as to balance the amount of the steam;
when a newly built second turbine 7 with high parameters in a newly built power generation system has a fault, steam generated by a newly built gas boiler 6 is subjected to temperature and pressure reduction treatment by a turbine bypass system and then is sent to an original turbine 2 with low parameters in an original power system, and the original turbine 2 with low parameters in the original power system basically keeps the original operation;
when a newly-built gas boiler 6 with high parameters in a newly-built power generation system breaks down, the newly-built gas boiler 6 is shut down, the original gas boiler 1 with low parameters in the original power system is put into operation, steam generated by the original gas boiler 1 with low parameters in the original power system is supplied to the original steam turbine 2 with low parameters in the original power system, and the whole original power system is recovered to be operated.
The newly-built first steam turbine 12 plays a role in balancing steam requirements so as to adapt to the condition that the quantity of fuel of the newly-built gas boiler 6 is changed to cause fluctuation of the steam quantity, in addition, because the newly-built third steam turbine 7 adopts a back pressure steam turbine, the steam inlet quantity of the back pressure steam turbine depends on the operation requirement of a deaerator, the back pressure steam turbine does not have the capacity of automatically adjusting the steam inlet quantity, the original steam turbine 2 serves for an upstream process, the steam inlet quantity of the original steam turbine depends on the process output requirement, the capacity of automatically adjusting the steam inlet quantity is not provided, and the newly-built first steam turbine 12 is arranged to be used for balancing the steam, so that the new-.
While the foregoing disclosure shows illustrative embodiments of the invention, it should be noted that various changes and modifications could be made herein without departing from the scope of the invention as defined by the appended claims. Furthermore, although elements of the invention may be described or claimed in the singular, the plural is contemplated unless limitation to a single element is explicitly stated.
Claims (8)
1. The utility model provides a gas increases efficiency and utilizes system based on steam parameter promotes, its characterized in that, including the original driving system and the new power generation system that communicate each other, original driving system includes at least one original gas boiler, at least one original steam turbine, the steam outlet of original gas boiler with the steam inlet intercommunication of original steam turbine, new power generation system is including newly-built first steam turbine, newly-built first generator and at least one gas power generation unit, gas power generation unit includes: newly-built gas boiler, newly-built second steam turbine, newly-built third steam turbine, newly-built second generator, re-heater, deaerator and feed-water pump, the steam parameter of the newly-built gas boiler of gas power generation unit is higher than the steam parameter of the original gas boiler of original power system, wherein:
the newly-built gas power generation unit is connected with the original power system through a gas pipe network, and the gas pipe network is respectively communicated with a gas inlet of the original gas boiler and a gas inlet of the newly-built gas boiler to supply fuel for the original gas boiler and the newly-built gas boiler;
the steam outlet of the newly-built gas boiler is communicated with the steam inlet of the newly-built second steam turbine, and the steam outlet of the newly-built second steam turbine is communicated with the steam inlet of the reheater;
the reheater is arranged in a flue of the newly-built gas boiler, a steam outlet of the reheater is respectively communicated with a steam inlet of the original steam turbine, a steam inlet of the newly-built first steam turbine and a steam inlet of the newly-built third steam turbine, and steam is supplied to the original steam turbine, the newly-built first steam turbine and the newly-built third steam turbine;
the steam outlet of the newly-built third steam turbine is communicated with the steam inlet of the deaerator to provide deaerated steam for the deaerator, and the water outlet of the deaerator is communicated with the water inlet of the newly-built gas boiler through the water feed pump to supply water to the newly-built gas boiler;
the newly-built second turbine and the newly-built third turbine are back pressure turbines;
the newly-built second turbine is coaxially connected with the newly-built third turbine and drives the newly-built second generator to generate power together;
the newly-built first turbine drives the newly-built first generator to generate power,
wherein: during normal operation, the original gas boiler in the original power system is shut down, the replaced gas is supplied to the newly-built gas boiler, steam generated by the newly-built gas boiler is utilized by the newly-built second steam turbine and is reheated by the reheater and then is respectively sent to the original steam turbine, the newly-built first steam turbine and the newly-built third steam turbine in the original power system, and the original steam turbine in the original power system is kept in the original operation; a first steam turbine is newly built to drive a newly built first generator to generate power, a second steam turbine and a third steam turbine are newly built to drive a newly built second generator to generate power together, and the generated energy of the newly built first generator and the newly built second generator is the newly increased income of the coal gas synergistic power generation system promoted based on steam parameters under the condition of the same coal gas consumption;
when the amount of coal gas at the inlet of the newly-built gas boiler fluctuates, the amount of steam supplied by the newly-built gas boiler also changes, and at the moment, the newly-built first steam turbine absorbs the steam fluctuation to balance the steam consumption;
when a newly-built second steam turbine in a newly-built power generation system breaks down, steam generated by a newly-built gas boiler is subjected to temperature and pressure reduction treatment by a steam turbine bypass system and then is sent to an original steam turbine in an original power system, and the original steam turbine in the original power system is kept in the original operation;
when the newly-built gas boiler in the newly-built power generation system breaks down, the newly-built gas boiler is shut down, the original gas boiler in the original power system is put into operation, steam generated by the original gas boiler in the original power system is supplied to the original steam turbine in the original power system, and the whole original power system is recovered to be operated.
2. The gas synergistic utilization system of claim 1, wherein the gas power generation units of the newly built power generation system further comprise a low pressure economizer, the original power system further comprises an original condenser connected to the original turbine, wherein,
the original turbine and the original condenser of the original coal gas power system are sequentially communicated with the water inlets of the low-pressure economizer and the deaerator of the coal gas power generation unit;
the low-pressure economizer is arranged in a tail flue of the newly-built 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.
3. The coal gas synergistic utilization system of claim 2, wherein the newly-built power generation system further comprises a condensate preheater, a water inlet and a water outlet of the condensate preheater are respectively communicated with a water outlet of the original condenser and a water inlet of the low-pressure economizer, and the condensate preheater preheats condensate at an outlet of the original condenser.
4. The coal gas synergistic utilization system of claim 3, wherein a steam inlet of the condensed water preheater is communicated with a plant low-pressure steam pipeline, and the condensed water preheater uses steam from the plant low-pressure steam pipeline as a heat source to preheat condensed water in the condensed water preheater.
5. The gas synergistic utilization system of claim 2, wherein the newly-built power generation system further comprises a newly-built condenser, a newly-built condensate pump, a condensate tank and a condensate booster pump which are connected with the newly-built first turbine, the original power system further comprises an original condensate pump which is connected with the original condenser, the steam exhaust port of the newly-built first turbine of the gas synergistic utilization system is sequentially communicated with the water inlets of the newly-built condenser, the newly-built condensate pump and the condensate tank along the steam flow direction, the water inlets of the original condenser, the original condensate pump and the condensate tank of the original power system are also sequentially communicated along the steam flow direction, and the water outlet of the condensate tank is sequentially communicated with the water inlets of the low-pressure economizers and the deaerators of the plurality of gas power generation units through the condensate booster pump.
6. The coal gas synergistic utilization system of claim 5, wherein the newly-built power generation system further comprises a condensed water collecting main pipe, the steam outlet of the original steam turbine is sequentially communicated with the original steam condenser, the original condensed water pump, the condensed water collecting main pipe and the water inlet of the condensed water tank along the steam flow direction, and the water outlet of the original condensed water pump is communicated with the water inlet of the condensed water tank through the condensed water collecting main pipe after being communicated with the condensed water collecting main pipe.
7. The gas energy efficient utilization system of claim 1, wherein the newly built power generation system further comprises a steam collecting main pipe, and after the steam outlet of the reheater of each gas power generation unit is communicated with the steam collecting main pipe, the steam outlet of the reheater of each gas power generation unit is respectively communicated with the steam inlet of the original steam turbine and the steam inlet of the newly built first steam turbine through the steam collecting main pipe.
8. The gas synergistic utilization system of claim 1, wherein in a plurality of gas power generation units, a main steam system between the newly-built gas boiler and the newly-built second steam turbine and the newly-built third steam turbine adopts a unit system, and a main steam outlet of each newly-built gas boiler is communicated with a steam inlet of the corresponding newly-built second steam turbine through a separate steam pipeline;
and a reheat steam system between the newly-built gas boiler and the newly-built second steam turbine is also made of units, and a reheat steam inlet of each newly-built gas boiler is communicated with a steam outlet of the corresponding newly-built second steam turbine through an independent steam pipeline.
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| CN102080582B (en) * | 2010-12-06 | 2013-07-17 | 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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