CN218409878U - Subcritical gas power generation system - Google Patents
Subcritical gas power generation system Download PDFInfo
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- CN218409878U CN218409878U CN202222541132.8U CN202222541132U CN218409878U CN 218409878 U CN218409878 U CN 218409878U CN 202222541132 U CN202222541132 U CN 202222541132U CN 218409878 U CN218409878 U CN 218409878U
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Abstract
The utility model relates to a subcritical gas power generation system, this subcritical gas power generation system includes: a boiler which burns gas and generates high-temperature steam, the boiler including at least a superheater and a reheater; the steam turbine set receives high-temperature steam of the boiler and converts steam heat energy into mechanical energy, and the steam turbine set at least comprises a first pressure cylinder and a second pressure cylinder; the generator is connected with the steam turbine set and converts the mechanical energy of the steam turbine set into electric energy; the steam outlet of the first pressure cylinder is connected with the steam inlet of the reheater, the steam outlet of the reheater is connected with the steam inlet of the second pressure cylinder, and the steam outlet of the second pressure cylinder is connected with the condensed water inlet of the boiler. The utility model provides an adopt when subcritical waste heat power generation, the not good technical problem of generating set thermal efficiency.
Description
Technical Field
The utility model relates to a blast furnace gas power generation field, it is further, relate to a subcritical gas power generation system, especially relate to a miniature high-efficient subcritical gas power generation system.
Background
Currently, in an iron and steel complex, carbon emission in an iron making process accounts for more than 70%, and a byproduct of the iron making process is blast furnace gas (mainly comprising CO). Among them, in addition to 60% of blast furnace gas as a production raw material which can be directly utilized, the remaining 30% has been used for power generation, but 10% of blast furnace gas is directly discharged without being utilized. In addition, in the field of steam turbines, the whole plant power generation efficiency of a large-scale thermal steam turbine generator unit can reach more than 40%, but because the blast furnace gas generation amount of a single iron and steel enterprise can not reach the demand of the large-scale steam turbine generator unit and the grid connection flexibility is also a problem, the installed power of the large-scale thermal power generation can not be selected. In the metallurgical industry, the thermal efficiency of a small steam turbine generator unit adopted for gas power generation is only 25%, in recent years, although a subcritical power generation technology with higher efficiency is developed, installed power is concentrated between 80MW and 150MW, and the installed power cannot be achieved for some small and medium-sized steel enterprises, so that a thermal efficient and miniaturized power generation system is urgently needed.
Although some power generation systems utilizing subcritical residual heat recovery exist in the prior art, the characteristics of coal gas fluctuation and the specificity of a micro subcritical power generation technology are generally not considered: when the blast furnace gas is small in surplus and the gas quantity cannot reach the requirement of a conventional subcritical generator set, how to deal with the situation.
Aiming at the problem that the heat efficiency of a generator set is poor when subcritical residual heat waste heat is adopted for power generation in the related art, an effective solution is not provided at present.
Therefore, the inventor provides a subcritical gas power generation system by virtue of experience and practice of related industries for many years, so as to overcome the defects in the prior art.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a subcritical coal gas power generation system effectively improves generating set's thermal efficiency, has good economic benefits and environmental protection effect simultaneously concurrently.
The purpose of the utility model can be realized by adopting the following scheme:
the utility model provides a subcritical gas power generation system, include:
a boiler which burns gas and generates high-temperature steam, the boiler including at least a superheater and a reheater;
the steam turbine set receives high-temperature steam of the boiler and converts steam heat energy into mechanical energy, and the steam turbine set at least comprises a first pressure cylinder and a second pressure cylinder;
a generator connected to the turbine unit and converting mechanical energy of the turbine unit into electric energy;
the steam inlet of the superheater is connected with the steam outlet of the boiler, the steam outlet of the superheater is connected with the steam inlet of the first pressure cylinder, the steam outlet of the first pressure cylinder is connected with the steam inlet of the reheater, the steam outlet of the reheater is connected with the steam inlet of the second pressure cylinder, and the steam outlet of the second pressure cylinder is connected with the condensed water inlet of the boiler.
The utility model discloses an in a preferred embodiment, the over heater includes low temperature over heater, high temperature over heater and the finishing superheater that establish ties in proper order along the flow direction of high temperature steam, low temperature over heater with between the high temperature over heater and high temperature over heater with be provided with first heat sink between the finishing superheater respectively.
In a preferred embodiment of the present invention, the reheater includes a low-temperature reheater and a high-temperature reheater connected in series in sequence along the flow direction of the high-temperature steam, the low-temperature reheater and the first cooling device are disposed between the high-temperature reheaters.
The present invention provides a preferable embodiment, wherein the first pressure cylinder is a high pressure cylinder, the second pressure cylinder includes an intermediate pressure cylinder and a low pressure cylinder, the steam inlet of the intermediate pressure cylinder is connected to the steam outlet of the high temperature reheater, the steam outlet of the intermediate pressure cylinder is connected to the steam inlet of the low pressure cylinder, and the steam outlet of the low pressure cylinder is the steam outlet of the second pressure cylinder.
In a preferred embodiment of the present invention, the steam outlet of the second pressure cylinder is connected to the inlet of a condenser, the outlet of the condenser is connected to the inlet of a first heater, the outlet of the first heater is connected to the inlet of a deaerator, and the outlet of the deaerator is connected to the condensed water inlet of the boiler;
and a condensate pump and a steam seal heater are arranged between the outlet of the condenser and the inlet of the first heater.
In a preferred embodiment of the present invention, a feed pump, a second heater and an economizer are provided between the outlet of the deaerator and the condensed water inlet of the boiler.
The utility model discloses an in a preferred embodiment, be provided with the water-cooling wall in the boiler, the steam outlet of boiler with the condensate inlet of boiler all is located on the water-cooling wall, the steam outlet of boiler with be provided with the steam pocket between the condensate inlet of boiler, the steam pocket with the steam inlet of over heater is connected.
In a preferred embodiment of the present invention, the front wall and the rear wall of the boiler are respectively provided with a plurality of burners, and the burners are located on the front wall and the rear wall, respectively and relatively distributed.
In a preferred embodiment of the present invention, each of the burners is connected to the blower and the external gas pipe through a hot air pipe and a gas pipe, respectively.
The utility model discloses an among the preferred embodiment, hot-blast pipeline includes at least one hot-blast trunk line and many hot-blast lateral conduits, the access connection of forced draught blower and pre-heater, the export of pre-heater with the one end of hot-blast trunk line is connected, the other end of hot-blast trunk line and each the one end of hot-blast lateral conduit is connected, each the other end of hot-blast lateral conduit respectively with correspond the combustor is connected.
The utility model discloses an in a preferred embodiment, the gas conduit includes an at least gas trunk line and many gas branch pipelines, the one end of gas trunk line with outside gas conduit connects, the other end of gas trunk line and each the one end of gas branch pipeline is connected, each the other end of gas branch pipeline respectively with correspond the combustor is connected.
The utility model discloses an in a preferred embodiment, the exhanst gas outlet and the chimney of boiler are connected, the exhanst gas outlet of boiler with economizer, second heat sink, desulphurization unit and draught fan have set gradually between the chimney.
The utility model discloses an in a preferred embodiment, the exhanst gas outlet of boiler or be close to the exhanst gas outlet of boiler is provided with the waste heat recovery device who carries out the recovery to the heat in the flue gas.
The utility model discloses an in a preferred embodiment, waste heat recovery device includes heat exchange tube, circulating pump and governing valve, the heat exchange tube is located in the flue of the exhanst gas outlet of boiler, the both ends of heat exchange tube advance the one end of pipe and the one end of condensate exit tube with the condensate respectively and are connected, the condensate advance the other end of pipe with the other end of condensate exit tube respectively with the water-cooled wall connection of boiler, the condensate advance the pipe with be connected with circulating pipe between the condensate exit tube, the circulating pump with the governing valve all set up in on the circulating pipe.
The utility model discloses an in a preferred embodiment, the exhanst gas outlet of boiler or be close to the position of exhanst gas outlet is provided with denitration reactor, the exhanst gas outlet of boiler with desulphurization unit and dust collector are connected.
From the above, the utility model discloses a subcritical gas power generation system's characteristics and advantage are: because the steam outlet of the boiler is connected with the steam inlet of the superheater, saturated steam generated in the boiler enters the superheater to generate high-efficiency subcritical superheated steam, the steam outlet of the superheater is connected with the steam inlet of a first pressure cylinder of the steam turbine unit, the steam outlet of the first pressure cylinder is connected with the steam inlet of the reheater, the superheated steam can enter the first pressure cylinder of the steam turbine unit to do work, the steam with reduced pressure after the work is done returns to the reheater in the boiler to be continuously heated, because the steam outlet of the reheater is connected with the steam inlet of a second pressure cylinder of the steam turbine unit, the steam after the reheating is further heated enters the second pressure cylinder of the steam turbine unit to be continuously done with work, the steam after the work is cooled into condensed water and is heated step by step and then returns to the boiler to be circularly used, the steam generated by the boiler can circularly do work for many times, and the corresponding pressure cylinder in the steam turbine unit is matched, so that enthalpy drop is effectively reduced through a graded work doing work mode, and the thermal efficiency of the generator is effectively improved.
Drawings
The drawings are only intended to illustrate and explain the present invention and do not limit the scope of the invention. Wherein:
FIG. 1: the structure of the subcritical gas power generation system is shown schematically.
FIG. 2: is a connection structure block diagram of a boiler and a steam turbine set in the subcritical gas power generation system.
FIG. 3: the schematic diagram of the arrangement position of the burner on the boiler in the subcritical gas power generation system is shown.
FIG. 4 is a schematic view of: is a schematic view of the connection structure of the boiler in the subcritical gas power generation system.
FIG. 5: do the utility model discloses waste heat recovery device's among subcritical coal gas power generation system schematic structure.
FIG. 6: does the structure schematic diagram of the dust removing device in the subcritical gas power generation system.
The utility model provides a reference numeral does:
1. a boiler; 101. A front wall;
102. a rear wall; 103. A burner;
2. a steam turbine unit; 201. A first pressure cylinder;
202. a second pressure cylinder; 3. A generator;
4. an induced draft fan; 5. A chimney;
6. a blower; 7. A first cooling device;
8. a coal economizer; 9. A preheater;
10. a main hot air pipeline; 11. A hot air branch pipeline;
12. a main gas pipeline; 13. A gas branch conduit;
15. a second cooling device; 16. A desulfurization unit;
17. an external gas conduit; 18. A denitration reactor;
19. a dust removal device; 20. A heat exchange pipe;
21. a circulation pump; 22. Adjusting a valve;
23. a condensed water inlet pipe; 24. A condensed water outlet pipe;
25. a circulating water pipe; 26. A condenser;
27. a condensate pump; 28. A steam seal heater;
29. a first heater; 30. A deaerator;
31. a feed pump; 32. A second heater;
33. a steam drum; 34. A low temperature superheater;
35. a high temperature superheater; 36. A finishing superheater;
37. a low temperature reheater; 38. A high temperature reheater.
Detailed Description
In order to clearly understand the technical features, objects and effects of the present invention, the embodiments of the present invention will be described with reference to the accompanying drawings.
As shown in fig. 1 and 2, the utility model provides a subcritical gas power generation system, this subcritical gas power generation system include boiler 1, turboset 2 and generator 3, and boiler 1 is used for burning coal gas and produces high-temperature steam, and turboset 2 is used for receiving the high-temperature steam of boiler and turns into mechanical energy with steam heat energy, and generator 3 is connected with turboset 2, and generator 3 is used for turning into the electric energy with the mechanical energy of turboset 2. Wherein the boiler 1 comprises at least a superheater and a reheater; the turboset 2 comprises at least a first pressure cylinder 201 and a second pressure cylinder 202; the steam inlet of the superheater is connected with the steam outlet of the boiler 1, the steam outlet of the superheater is connected with the steam inlet of the first pressure cylinder 201, the steam outlet of the first pressure cylinder 201 is connected with the steam inlet of the reheater, the steam outlet of the reheater is connected with the steam inlet of the second pressure cylinder 202, and the steam outlet of the second pressure cylinder 202 is connected with the condensed water inlet of the boiler 1.
The utility model discloses in, because the steam outlet of boiler 1 and the steam access connection of over heater, produce saturated steam in the boiler 1 and get into to the over heater in and produce high-efficient subcritical superheated steam, the steam outlet of over heater and the steam access connection of the first pressure cylinder 201 of turboset 2, the steam outlet of first pressure cylinder 201 and the steam access connection of reheater, superheated steam can get into the first pressure cylinder 201 of turboset 2 and do work, the steam that reduces after doing work returns and continues to heat in the reheater in the boiler 1, because the steam outlet of reheater and the steam access connection of the second pressure cylinder 202 of turboset 2, steam after the reheating gets into and continues to do work in the second pressure cylinder 202 of turboset 2, steam cooling after the doing work becomes the condensate water and returns to boiler 1 inner loop after heating step by step and uses, make the steam that boiler 1 produced can circulate and do work many times, and match the pressure cylinder that corresponds in the turboset 2, effectively reduce the enthalpy through hierarchical mode, effectively improve generator 3's thermal efficiency.
In an optional embodiment of the present invention, as shown in fig. 2, the superheater includes a low temperature superheater 34, a high temperature superheater 35 and a finishing superheater 36 connected in series in sequence along the flow direction of the high temperature steam, and first temperature reduction devices 7 are respectively disposed between the low temperature superheater 34 and the high temperature superheater 35 and between the high temperature superheater 35 and the finishing superheater 36. The steam is heated from saturation temperature to superheat temperature through the cooperation of the low-temperature superheater 34, the high-temperature superheater 35 and the final superheater 36, so that high-efficiency subcritical superheated steam is generated.
In an optional embodiment of the present invention, as shown in fig. 2, the reheater includes a low-temperature reheater 37 and a high-temperature reheater 38 connected in series in sequence along the flow direction of the high-temperature steam, and a first temperature reduction device 7 is disposed between the low-temperature reheater 37 and the high-temperature reheater 38. The low-temperature reheater 37 and the high-temperature reheater 38 are matched to heat the working steam again and make the steam reach a certain temperature, the thermal efficiency of the power generation system can be further improved through the low-temperature reheater 37 and the high-temperature reheater 38, and the temperature of the steam can be controlled within an allowable range.
Specifically, as shown in fig. 2, the first pressure cylinder 201 is a high pressure cylinder, the second pressure cylinder 202 includes an intermediate pressure cylinder and a low pressure cylinder, a steam inlet of the intermediate pressure cylinder is connected to a steam outlet of the high temperature reheater, a steam outlet of the intermediate pressure cylinder is connected to a steam inlet of the low pressure cylinder, and a steam outlet of the low pressure cylinder is a steam outlet of the second pressure cylinder. The superheated steam firstly enters a high-pressure cylinder of the steam turbine set 2 to do work, the middle-pressure steam after doing work returns to the boiler 1 to be continuously heated by the low-temperature reheater 37 and the high-temperature reheater 38 in sequence, then the heated steam enters a middle-pressure cylinder and a low-pressure cylinder of the steam turbine set 2 in sequence to continuously do work, the steam after doing work is cooled into condensed water, the condensed water is heated step by step and then returns to the boiler 1 to be recycled, the enthalpy drop can be effectively reduced, and the stage efficiency of the through-flow design of the steam turbine set 2 can be improved by about 2%.
In an optional embodiment of the present invention, as shown in fig. 2, the steam outlet of the second pressure cylinder 202 is connected to the inlet of the condenser 26, the outlet of the condenser 26 is connected to the inlet of the first heater 29, the outlet of the first heater 29 is connected to the inlet of the deaerator 30, and the outlet of the deaerator 30 is connected to the condensed water inlet of the boiler 1; a condensate pump 27 and a gland seal heater 28 are sequentially arranged between the outlet of the condenser 26 and the inlet of the first heater 29. The condenser 26, the condensate pump 27, the steam seal heater 28, the first heater 29 and the deaerator 30 constitute a condensate system of the turbine unit 2. The condensed water is led out by the condenser 26, and then is divided into two paths to two full-capacity condensed water pumps 27 (the number of the condensed water pumps 27 is two, one of the two is for standby), the condensed water pumps 27 adopt frequency conversion regulation, the condensed water passes through the steam seal heater 28 and the first heater 29 to the deaerator 30, and subsequent step-by-step heating treatment can be carried out after dissolved oxygen in the condensed water is removed.
Wherein, the oxygen-eliminating device 30 adopts the sliding pressure operation mode, and the oxygen-eliminating device 30 has two way steam sources: one path is a normal operation steam source; and the other path is connected with a steam source pipeline of the steam turbine set 2 to supply steam to the deaerator 30, when the pressure rises to a preset specified pressure, the steam source is automatically switched to a normal operation air source, and the operation pressure of the deaerator 30 changes along with the load change of the steam turbine set 2.
Further, condenser 26 includes the evacuation system, and the evacuation system includes vacuum pump and cooperation pipeline, and the vacuum pump is used for carrying out the evacuation to condenser 26. Wherein, the quantity of vacuum pump is two, and one is for standby.
Further, the first heater 29 may be, but is not limited to, a low pressure heater.
Further, as shown in fig. 2, a feed water pump 31, a second heater 32 and an economizer 8 are sequentially disposed between the outlet of the deaerator 30 and the condensed water inlet of the boiler 1. The condensed water is heated by the second heater 32 and the economizer 8 step by step, and is pumped back to the boiler 1 by the feed water pump 31 for recycling.
In an optional embodiment of the present invention, as shown in fig. 2, a water wall is disposed in the boiler 1, the steam outlet of the boiler 1 and the condensed water inlet of the boiler 1 are both located on the water wall, a steam drum 33 is disposed between the steam outlet of the boiler 1 and the condensed water inlet of the boiler 1, and the steam drum 33 is connected to the steam inlet of the low temperature superheater 34. The steam drum 33 can perform steam-water separation and steam purification, and simultaneously receive condensed water, perform steam-water separation and supply water to the circulation loop, and deliver saturated steam to the superheater. The steam drum has a certain amount of water, so that the change speed of the steam pressure can be slowed down when the working condition changes, and a certain buffering effect is achieved when the water supply is not coordinated with the load for a short time.
In an optional embodiment of the present invention, as shown in fig. 3 and 4, the fuel used by the boiler 1 is coal gas (such as blast furnace gas and/or converter gas), the coal gas has the characteristics of low heat value and high ignition temperature, the front wall 101 and the rear wall 102 of the boiler 1 are respectively provided with a plurality of burners 103, and each burner 103 located on the front wall and each burner 103 located on the rear wall 102 are distributed relatively, so as to form opposed firing, thereby ensuring the temperature field and the combustion condition required by the combustion of the blast furnace gas. The burner 103 is provided with an ignition device, a flame monitoring device, an automatic ignition device and a fire extinguishing protection device, and the burner 103 and each functional device arranged on the burner are all existing products, so that the detailed description is omitted.
Further, as shown in fig. 4, each burner 103 is connected to the blower 6 through a hot air duct, and each burner 103 is also connected to an external gas duct 17 through a gas duct, thereby supplying air and gas required for combustion of the boiler 1 to ensure normal combustion of the boiler 1. Wherein the ignition fuel may be, but is not limited to, liquefied petroleum gas.
Specifically, as shown in fig. 4, the hot air pipeline includes at least one main hot air pipeline 10 and a plurality of branch hot air pipelines 11, the blower 6 is connected to an inlet of the preheater 9, an outlet of the preheater 9 is connected to one end of the main hot air pipeline 10, the other end of the main hot air pipeline 10 is connected to one end of each branch hot air pipeline 11, and the other end of each branch hot air pipeline 11 is connected to the corresponding burner 103. Air required for combustion of the boiler 1 is supplied by a blower 6, and the air conveyed by the blower 6 enters the hearth after being preheated by a preheater 9. The blowers 6 may be, but not limited to, high-efficiency centrifugal blowers, the number of the blowers 6 is two, and the air volume adjusting mode of the two blowers 6 is variable frequency adjustment.
Specifically, as shown in fig. 4, the gas pipeline includes at least one main gas pipeline 12 and a plurality of branch gas pipelines 13, one end of the main gas pipeline 12 is connected to an external gas pipeline 17, the other end of the main gas pipeline 12 is connected to one end of each branch gas pipeline 13, the other end of each branch gas pipeline 13 is connected to a corresponding burner 103, gas required for combustion of the boiler 1 is provided by the external gas pipeline 17, and the external gas pipeline 17 is connected to the blast furnace. Wherein the coal gas is a by-product of a blast furnace, namely blast furnace gas, or a by-product of a converter, namely converter gas.
Further, as shown in fig. 4, a flue gas outlet of the boiler 1 is connected with the chimney 5, and an economizer 8, a second cooling device 15, a desulfurization device 16 and an induced draft fan 4 are sequentially arranged between the flue gas outlet of the boiler 1 and the chimney 5. The second temperature reducing device 15 can be, but is not limited to, a water medium type heat pipe heater, and the temperature of the flue gas discharged by the boiler can be reduced through the second temperature reducing device 15, so that the economy is improved. Wherein, the desulphurization device 16 can adopt a mode of combining various desulphurization methods and dust removers to meet the emission requirement. The induced draft fans 4 can be but not limited to high-efficient centrifugal induced draft fans, and the quantity of induced draft fans 4 is two, and the load control mode of two induced draft fans 4 is frequency conversion control, and the flue gas after the desulfurization dust removal is discharged by chimney 5 after the induced draft fan 4 steps up.
Further, as shown in fig. 4 and 6, a denitration reactor 18 is disposed at a flue gas outlet of the boiler 1 or a position close to the flue gas outlet, the denitration reactor 18 can save space and land, and the flue gas outlet of the boiler 1 is connected with a desulfurization device 16 and a dust removal device 19. Wherein, the preferred flue gas pollutant control system technology combination is: the low-nitrogen combustion and sodium denitration reactor 18 and the basic dry desulfurization are combined with a bag-type dust remover, or the low-nitrogen combustion and sodium denitration reactor 18 and the limestone semi-dry desulfurization are combined with the bag-type dust remover, or the low-nitrogen combustion and sodium denitration reactor 18 and the wet desulfurization are combined with a wet electric dust remover. After the desulfurization device 16 and the dust removal device 19 remove dust and sulfur from the flue gas, SO can be satisfied 2 The concentration is less than or equal to 35mg/Nm 3 Dust concentration is less than or equal to 5mg/Nm 3 Ultra-clean emission requirements.
In an optional embodiment of the present invention, as shown in fig. 5, a waste heat recovery device for recovering heat in flue gas is disposed at the flue gas outlet of the boiler 1 or at the flue gas outlet close to the boiler 1. The waste heat recovery device comprises a heat exchange tube 20, a circulating pump 21 and an adjusting valve 22, the quantity of the heat exchange tube 20 can be a plurality of heat exchange tubes arranged side by side, each heat exchange tube 20 is positioned in a flue of a flue gas outlet of the boiler 1, one end of the heat exchange tube 20 is connected with one end of a condensed water inlet tube 23, the other end of the heat exchange tube 20 is connected with one end of a condensed water outlet tube 24, the other end of the condensed water inlet tube 23 and the other end of the condensed water outlet tube 24 are respectively connected with a water-cooled wall of the boiler 1, a circulating water pipe 25 is connected between the condensed water inlet tube 23 and the condensed water outlet tube 24, and the circulating pump 21 and the adjusting valve 22 are both arranged on the circulating water pipe 25. The flue gas is subjected to heat exchange through the heat exchange tube 20, the flue gas waste heat of the boiler 1 can be further utilized to reduce the exhaust gas temperature, and in the actual operation process, the flow of condensed water passing through the heat exchange tube 20 can be controlled by controlling the opening degree of the regulating valve 22, so that the aim of controlling the exhaust gas temperature of the boiler 1 is fulfilled, the exhaust gas temperature of the boiler 1 is kept constant above an acid dew point, and the aim of corrosion prevention is fulfilled. Of course, the number of the heat exchange pipes 20 can be adjusted, and the purpose of controlling the exhaust gas temperature of the boiler 1 can be achieved by adjusting the heat exchange area.
The utility model discloses an optional embodiment, can set up continuous blowdown flash tank (not shown) and periodic blowdown flash tank (not shown), continuous blowdown flash tank and periodic blowdown flash tank are connected with the drain of boiler 1 respectively, can set up drainage cooling pond (not shown) in the power plant, and continuous blowdown flash tank and periodic blowdown flash tank can be with sewage drainage cooling pond.
The utility model discloses an overall work flow does: the method comprises the steps that blast furnace byproducts (blast furnace gas) are conveyed to a boiler 1 through a pipeline, the gas and air fed into the boiler 1 through a blower 6 are mixed and combusted, flue gas at the discharge part of the boiler 1 exchanges heat with the gas, the flue gas and the gas sequentially pass through a denitration reactor 18, a desulfurization device 16 and a dust removal device 19 under the action of a draught fan 4, sulfur dioxide and particles in the flue gas are desulfurized and dedusted and then are discharged into the atmosphere through a chimney 5, heat generated by combustion heats feed water of the boiler 1, the feed water absorbs the heat of the flue gas and is vaporized into ultrahigh-pressure steam, the steam enters a steam turbine unit 2 to do work to convert the heat energy into mechanical energy, a generator 3 is driven to generate electricity, the generator 3 outputs electric energy, and the output electric energy can be connected to a main substation bus through a booster.
In the whole control process, full-automatic control (such as intelligent artificial control strategy, predictive control, fuzzy control, automatic optimization, feedback correction and other technologies) under various working conditions of the boiler 1 can be realized, the highest energy utilization efficiency is realized, meanwhile, the labor cost is greatly reduced, remote online monitoring and fault early warning can be carried out on operation data and equipment, and the intelligent operation of the generator is realized.
The utility model discloses in, boiler 1 adopts miniaturized design, reduces boiler 1's furnace size, reduces boiler 1's water-cooling wall heat transfer area, guarantees the exhaust gas temperature of furnace export. The convection heating surface is considered to adopt a countercurrent arrangement, so that the convection heat exchange quantity is increased. The burners 103 are oppositely arranged to form opposed combustion, so that the temperature field and the combustion working condition required by gas combustion are ensured. The smoke outlet of the boiler 1 or the smoke outlet close to the boiler 1 is provided with a waste heat recovery device, the waste heat of the boiler smoke can be used for heating condensed water, the purpose of controlling the smoke exhaust temperature of the boiler 1 is achieved by adjusting the flow or the heat exchange area of the condensed water, and the smoke exhaust temperature can be reduced to about 115 ℃ from 140 ℃.
In the utility model, the evaporation capacity of the boiler 1 is preferably 150t/h-300t/h, the steam turbine set 2 is preferably 40MW-80MW, the pressure of the high-efficiency subcritical superheated steam (namely: main steam) directly generated by the boiler 1 is preferably 167MPa-17.5MPa, and the temperature is preferably 566 ℃ -571 ℃; the temperature of the steam that is continuously heated in the reheater (i.e., reheated steam) is preferably 566 deg.C-569 deg.C, and the capacity of the generator 3 is preferably 50MW-90MW.
The utility model discloses a subcritical coal gas power generation system's characteristics and advantage are:
1. the subcritical coal gas power generation system can effectively improve the heat efficiency of the generator 3, so that the heat efficiency of the generator 3 reaches about 40%, the coal gas is efficiently utilized, and the subcritical coal gas power generation system has good economic benefit.
2. In the subcritical gas power generation system, the waste heat recovery device for recovering the heat of the low-temperature flue gas of the boiler 1 is arranged, so that the waste heat of the flue gas can be recycled, and the power generation efficiency is further improved.
3. In the subcritical gas power generation system, the flue gas is subjected to denitration, desulfurization, dust removal and other treatment, so that the flue gas is ensured to reach the standard of discharge.
4. In the subcritical gas power generation system, the boiler 1 adopts a miniaturized design, is particularly suitable for medium and small steel mills, and is flexible in grid connection and peak regulation.
The above description is only exemplary of the present invention, and is not intended to limit the scope of the present invention. Any person skilled in the art should also realize that such equivalent changes and modifications can be made without departing from the spirit and principles of the present invention.
Claims (15)
1. A subcritical gas power generation system, comprising:
a boiler which burns gas and generates high-temperature steam, the boiler including at least a superheater and a reheater;
the steam turbine set receives high-temperature steam of the boiler and converts steam heat energy into mechanical energy, and the steam turbine set at least comprises a first pressure cylinder and a second pressure cylinder;
a generator connected to the turbine unit and converting mechanical energy of the turbine unit into electric energy;
the steam inlet of the superheater is connected with the steam outlet of the boiler, the steam outlet of the superheater is connected with the steam inlet of the first pressure cylinder, the steam outlet of the first pressure cylinder is connected with the steam inlet of the reheater, the steam outlet of the reheater is connected with the steam inlet of the second pressure cylinder, and the steam outlet of the second pressure cylinder is connected with the condensed water inlet of the boiler.
2. The subcritical gas power generation system according to claim 1, wherein the superheater comprises a low-temperature superheater, a high-temperature superheater and a finishing superheater which are connected in series in the flow direction of high-temperature steam, and first temperature reduction devices are respectively arranged between the low-temperature superheater and the high-temperature superheater and between the high-temperature superheater and the finishing superheater.
3. The subcritical gas power generation system according to claim 1, wherein the reheater comprises a low temperature reheater and a high temperature reheater connected in series in a flow direction of high temperature steam, and a first temperature reduction device is disposed between the low temperature reheater and the high temperature reheater.
4. The subcritical gas power generation system according to claim 3, wherein the first pressure cylinder is a high pressure cylinder, the second pressure cylinder includes an intermediate pressure cylinder and a low pressure cylinder, a steam inlet of the intermediate pressure cylinder is connected to a steam outlet of the high temperature reheater, a steam outlet of the intermediate pressure cylinder is connected to a steam inlet of the low pressure cylinder, and a steam outlet of the low pressure cylinder is a steam outlet of the second pressure cylinder.
5. The subcritical gas power generation system according to claim 1 or 4, wherein a steam outlet of the second pressure cylinder is connected with an inlet of a condenser, an outlet of the condenser is connected with an inlet of a first heater, an outlet of the first heater is connected with an inlet of a deaerator, and an outlet of the deaerator is connected with a condensed water inlet of the boiler;
and a condensate pump and a steam seal heater are arranged between the outlet of the condenser and the inlet of the first heater.
6. The subcritical gas power generation system according to claim 5, wherein a feed water pump, a second heater and an economizer are provided between an outlet of the deaerator and a condensed water inlet of the boiler.
7. The subcritical gas power generation system according to claim 6, wherein a water wall is provided in the boiler, a steam outlet of the boiler and a condensed water inlet of the boiler are both located on the water wall, a steam drum is provided between the steam outlet of the boiler and the condensed water inlet of the boiler, and the steam drum is connected with the steam inlet of the superheater.
8. The subcritical gas power generation system according to claim 1, wherein a plurality of burners are provided on a front wall and a rear wall of said boiler, respectively, and the burners located on said front wall and said rear wall are disposed to be opposed to each other, respectively.
9. The subcritical gas power generation system of claim 8 wherein each of the burners is connected to the blower and the external gas pipe through a hot air pipe and a gas pipe, respectively.
10. The subcritical gas power generation system according to claim 9, wherein the hot air pipeline comprises at least one main hot air pipeline and a plurality of branch hot air pipelines, the blower is connected to an inlet of the preheater, an outlet of the preheater is connected to one end of the main hot air pipeline, the other end of the main hot air pipeline is connected to one end of each branch hot air pipeline, and the other end of each branch hot air pipeline is connected to the corresponding burner.
11. The subcritical gas power generation system according to claim 9, wherein the gas pipeline comprises at least one main gas pipeline and a plurality of branch gas pipelines, one end of the main gas pipeline is connected to the external gas pipeline, the other end of the main gas pipeline is connected to one end of each of the branch gas pipelines, and the other end of each of the branch gas pipelines is connected to the corresponding burner.
12. The subcritical gas power generation system according to claim 1 or 8, wherein a flue gas outlet of the boiler is connected with a chimney, and an economizer, a second temperature reduction device, a desulfurization device and an induced draft fan are sequentially arranged between the flue gas outlet of the boiler and the chimney.
13. The subcritical gas power generation system according to claim 12, wherein a waste heat recovery device for recovering heat in flue gas is provided at or near the flue gas outlet of the boiler.
14. The subcritical gas power generation system according to claim 13, wherein the waste heat recovery device comprises a heat exchange tube, a circulation pump and an adjustment valve, the heat exchange tube is located in a flue of a flue gas outlet of the boiler, two ends of the heat exchange tube are respectively connected with one end of a condensed water inlet tube and one end of a condensed water outlet tube, the other end of the condensed water inlet tube and the other end of the condensed water outlet tube are respectively connected with a water-cooled wall of the boiler, a circulation water tube is connected between the condensed water inlet tube and the condensed water outlet tube, and the circulation pump and the adjustment valve are both arranged on the circulation water tube.
15. The subcritical gas power generation system according to claim 12, wherein a denitration reactor is provided at a position at or near the flue gas outlet of the boiler, and the flue gas outlet of the boiler is connected to the desulfurization device and the dust removal device.
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| CN202222541132.8U CN218409878U (en) | 2022-09-26 | 2022-09-26 | Subcritical gas power generation system |
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