CN112856380B - A generalized heat recovery system for boiler and heat recovery method - Google Patents
A generalized heat recovery system for boiler and heat recovery method Download PDFInfo
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- CN112856380B CN112856380B CN202110249308.XA CN202110249308A CN112856380B CN 112856380 B CN112856380 B CN 112856380B CN 202110249308 A CN202110249308 A CN 202110249308A CN 112856380 B CN112856380 B CN 112856380B
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- 238000011084 recovery Methods 0.000 title claims abstract description 17
- 238000000034 method Methods 0.000 title abstract description 7
- 238000010438 heat treatment Methods 0.000 claims abstract description 45
- 239000003546 flue gas Substances 0.000 claims abstract description 42
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 41
- 239000003245 coal Substances 0.000 claims abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 66
- 238000000605 extraction Methods 0.000 claims description 26
- 230000001105 regulatory effect Effects 0.000 claims description 17
- 239000000779 smoke Substances 0.000 claims description 9
- 238000009833 condensation Methods 0.000 claims description 5
- 230000005494 condensation Effects 0.000 claims description 5
- 230000008929 regeneration Effects 0.000 claims description 4
- 238000011069 regeneration method Methods 0.000 claims description 4
- 239000007789 gas Substances 0.000 abstract 1
- 238000005457 optimization Methods 0.000 abstract 1
- 238000001816 cooling Methods 0.000 description 27
- 239000000843 powder Substances 0.000 description 20
- 230000001172 regenerating effect Effects 0.000 description 5
- 238000011144 upstream manufacturing Methods 0.000 description 3
- 239000000446 fuel Substances 0.000 description 2
- 238000005399 mechanical ventilation Methods 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 239000002918 waste heat Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000008236 heating water Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
Classifications
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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
- F22D1/36—Water and air preheating systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K1/00—Preparation of lump or pulverulent fuel in readiness for delivery to combustion apparatus
- F23K1/04—Heating fuel prior to delivery to combustion apparatus
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K2900/00—Special features of, or arrangements for fuel supplies
- F23K2900/01041—Heating by using exhaust gas heat
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Air Supply (AREA)
Abstract
本发明公开一种机炉广义回热系统及热回收方法，系统包括预省煤器模块、空气预热器旁路模块、冷风加热模块以及空气调温模块、煤粉加热模块，沿着烟气流向在锅炉原省煤器的下游设置预省煤器模块和空气预热器旁路模块，空气预热器旁路模块的入口设置在预省煤器模块与空气预热器之间，并连通烟道，空气预热器旁路模块的出口连通空气预热器后方的烟道，空气调温模块设置在空气预热器的空气侧热一次风出口处；冷风加热模块设置在冷一次风进入空气预热器前的路径上，采用本发明所述系统尽可能提高机炉回热量及回热效率，在汽机侧体现为尽可能不增加汽机排汽量，在锅炉侧体现为锅炉空气预热器排烟为回热热源，并通过系统优化，尽可能提高回热利用品质。
The present invention discloses a generalized heat recovery system for a machine and a boiler and a heat recovery method. The system comprises a pre-economizer module, an air preheater bypass module, a cold air heating module, an air temperature control module and a pulverized coal heating module. The pre-economizer module and the air preheater bypass module are arranged downstream of an original economizer of the boiler along the flow of flue gas. The inlet of the air preheater bypass module is arranged between the pre-economizer module and the air preheater and is connected to the flue. The outlet of the air preheater bypass module is connected to the flue behind the air preheater. The air temperature control module is arranged at the hot primary air outlet on the air side of the air preheater; the cold air heating module is arranged on the path before the cold primary air enters the air preheater. The system of the present invention is adopted to improve the heat recovery amount and the heat recovery efficiency of the machine and the boiler as much as possible, which is reflected in not increasing the exhaust volume of the steam turbine as much as possible on the steam turbine side, and in the boiler side, the exhaust gas of the boiler air preheater is used as the heat source for heat recovery, and the heat recovery utilization quality is improved as much as possible through system optimization.
Description
Technical Field
The invention belongs to the field of machine furnace heat recovery, and particularly relates to a machine furnace generalized backheating system and a heat recovery method.
Background
The conventional regenerative system mainly carries out regenerative operation on the side of the steam turbine, the regenerative object is that regenerative operation of water supply is high-pressure water supply, steam turbine exhaust loss is reduced through regenerative operation of the water supply, and the heat consumption level of the steam turbine is reduced. However, for power plants, the lowest steam turbine heat consumption value does not mean that the unit efficiency is highest, for example, an increase in the feed water temperature affects the boiler outlet temperature to some extent, and thus the boiler efficiency. In essence, the highest efficiency of the power plant should be the lowest practical coal consumption. In order to further reduce the actual coal consumption of the power plant, the generalized backheating scheme is specially provided.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides the generalized heat recovery system of the machine furnace and the heat recovery method, which fully recover the system heat from the side of the steam engine and the side of the boiler, realize the integral improvement of the efficiency of the machine furnace and reduce the coal consumption.
In order to achieve the aim, the generalized heat recovery system of the machine furnace adopts the technical scheme that the generalized heat recovery system comprises a pre-economizer module, an air preheater bypass module, a cold air heating module and an air temperature regulating module, wherein the pre-economizer module and the air preheater bypass module are arranged at the downstream of an original boiler economizer along the flow direction of smoke, the air preheater bypass module is arranged in parallel with an air preheater, the air preheater bypass module is arranged at the downstream of the pre-economizer module, an outlet of the air preheater bypass module is communicated with a flue behind the air preheater, the air temperature regulating module is arranged at a hot primary air outlet at the air side of the air preheater, and the cold air heating module is arranged on a path before cold primary air enters the air preheater and is used for obtaining heat of smoke, steam extraction or condensation water to heat the cold air.
The water inlet of the pre-economizer module is communicated with a high-pressure water supply pipeline, the water outlet of the pre-economizer module is communicated with the water inlet of the economizer, and circulating water is adopted in the air preheater bypass module for heat exchange.
The cold air heating module comprises at least one of a steam high-temperature warm air device, a drainage cooling warm air device, a heat medium water air preheater and a cold end heat exchanger, wherein the cold end heat exchanger is arranged at an air inlet of cold air and is communicated with a circulating water pipeline of a cooling tower;
When the steam high-temperature air heater and the drainage cooling air heater are arranged at the same time, the drainage cooling air heater is communicated with the steam high-temperature air heater;
when arranging steam high temperature warm-air ware, drainage cooling warm-air ware and heat medium water air preheater simultaneously, heat medium water air preheater is including the air side heat exchanger and the flue gas side heat exchanger of mutual intercommunication, and steam high temperature warm-air ware and drainage cooling warm-air ware set up in the air side, along the air flow direction, and the air side heat exchanger is arranged at the downgoing direction of drainage cooling warm-air ware, and steam high temperature warm-air ware sets up the downgoing direction at the air side heat exchanger.
The bypass module of the air preheater comprises a bypass flue, a bypass high-temperature heat exchanger and a bypass low-temperature heat exchanger, wherein a bypass adjusting baffle is arranged in the bypass flue, a flue gas adjusting baffle is arranged on the flue gas side of the air preheater, circulating water and flue gas heat exchange is adopted in the bypass high-temperature heat exchanger and the bypass low-temperature heat exchanger, the bypass high-temperature heat exchanger is communicated with high-pressure water supply of a boiler system, and the bypass low-temperature heat exchanger heats condensation water of a turbine unit.
And a powder feeding heating module is arranged on a pipeline from the coal mill to the boiler fuel inlet.
The powder feeding heating module is communicated with the air preheater bypass module or the steam extraction pipeline of the steam turbine through a pipeline, or the powder feeding heating module is communicated with the air preheater bypass module and the steam extraction pipeline of the steam turbine.
The air temperature regulating module adopts steam turbine steam extraction as a heat source, and is communicated with a steam turbine steam extraction pipeline and a high-pressure heater, or a high-temperature hot air preheater is arranged in parallel on the heating surface of the low-temperature superheater, the low-temperature reheater or the economizer to serve as the heat source, and an air side outlet of the air preheater is communicated with the high-temperature hot air preheater.
The pre-economizer module is provided with a water bypass, the water bypass comprises a regulating valve, a shut-off valve and a connecting pipeline, and the water bypass is communicated with the pre-economizer module and the economizer.
A generalized backheating method for a machine furnace comprises the steps of heating high-pressure water supply to an upper limit temperature by utilizing smoke heat through a pre-economizer module and an air preheater bypass module, heating cold air to an upper limit temperature of a cold air inlet allowed by an air preheater by utilizing smoke, steam turbine extraction and/or condensate heat through a cold air heating module and an air temperature adjusting module, realizing partial or whole backheating to a boiler for recycling through the pre-economizer module and the air preheater bypass module, and recycling heat which is not recycled to the boiler through the pre-economizer module and the air preheater bypass module to a steam turbine.
The coal powder is heated to the upper limit temperature of the coal powder entering the hearth by the steam extraction of the steam turbine or the heat of the flue gas, or the coal powder is heated to the upper limit temperature of the coal powder entering the hearth by the steam extraction of the steam turbine and the heat of the flue gas.
Compared with the prior art, the invention has at least the following beneficial effects:
The method comprises the steps that a pre-economizer module and an air preheater bypass module are arranged at the downstream of an original boiler economizer along the flow direction of flue gas, the air preheater bypass module and the air preheater are arranged at the downstream of the pre-economizer module in parallel and communicated with a flue, the outlet of the air preheater bypass module is communicated with the flue at the rear of the air preheater, part of heat of flue gas at the outlet of the economizer is firstly recovered by the air preheater bypass module, and an air temperature regulating module is arranged at the air side hot primary air outlet of the air preheater and utilizes part of heat of the flue gas again; the system comprises a cold air heating module, an economizer and an air preheater, wherein the cold air heating module is arranged on a path before cold primary air enters an air preheater, the cold air heating module is used for obtaining heat of flue gas, steam turbine extraction or condensation water to heat the cold air, the requirement of the cold air for the heat of the flue gas of the air preheater is reduced after the cold air is heated, more heat can be released by upstream flue gas to heat the water supply or condensation water, the economizer and flue gas at the outlet of the air preheater are utilized in a grading mode, and the heat of the recovered flue gas heats different objects.
Furthermore, the pulverized coal heating module is arranged, and the pulverized coal is heated by adopting the air preheater bypass module and steam turbine steam extraction, so that the pulverized coal can be heated to the theoretical highest temperature of entering a hearth, and the heat recovery efficiency of the boiler and the steam turbine is improved.
Furthermore, the cooling circulating water of various cooling towers such as an indirect cooling tower, a mechanical ventilation cooling tower and the like is used as a heat source to heat cold air, so that the temperature of the cold air entering the air preheater is increased, the exhaust steam of the steam turbine is reduced, and the heat of the absorbed flue gas is reduced.
Drawings
Fig. 1 is a schematic view of a regenerator system according to embodiment 1 of the present invention.
Fig. 2 is a schematic view of a regenerator system according to embodiment 2 of the present invention.
Fig. 3 is a schematic view of a regenerator system according to embodiment 3 of the present invention.
Fig. 4 is a schematic view of a regenerator system according to embodiment 4 of the present invention.
Fig. 5 is a schematic view of a regenerator system according to embodiment 5 of the present invention.
In the drawings, a 1-pre-economizer module, a 2-air preheater bypass module, a 3-cold air heating module, a 4-air temperature regulating module, a 5-powder feeding heating module, a 6-air preheater, a 7-cooling circulating water system, a No. 8-3 high-pressure heater, a 9-deaerator, a 10-economizer, a 21-bypass flue, a 22-bypass high-temperature heat exchanger, a 23-bypass low-temperature heat exchanger, a 31-steam high-temperature air heater, a 32-hydrophobic cooling air heater, a 33-hot medium water air preheater, a 331-air side heat exchanger, a 332-flue gas side heat exchanger, a 34-cold end heat exchanger, a 41-air temperature regulating heat exchanger and a 42-high-temperature hot air preheater.
Detailed Description
The invention will now be described in detail with reference to the accompanying drawings and examples.
The generalized heat returning system for the engine and the furnace takes the engine and the furnace as boundary conditions, heat with the temperature higher than the ambient temperature in a power plant can be used for heat returning, and the difference from the utilization of conventional flue gas waste heat is that a heat returning object comprises waste heat such as smoke exhaust and valuable heat such as steam extraction of a certain steam turbine, so that generalized heat returning is realized, the limit control conditions of the engine and the furnace are 3, namely, the smoke exhaust temperature of a rotary air preheater is limited, the inlet air temperature of the rotary air preheater can only be heated to the smoke exhaust temperature minus about 20 ℃, the water supply temperature of the second steam turbine is limited, the outlet flue gas temperature of a pre-economizer module 1 is the water supply temperature plus about 20 ℃, and the highest temperature of a pulverized coal pipeline is the highest allowable temperature for hot air powder feeding of the medium-storage pulverizing system.
In the case of example 1,
Referring to fig. 1, the embodiment provides a generalized heat regeneration system of an engine furnace, which comprises a pre-economizer module 1, an air preheater bypass module 2, a cold air heating module 3 and an air temperature regulating module 4, wherein the pre-economizer module 1, the air preheater bypass module 2 and the cold air heating module 3 are arranged along the flow direction of flue gas, the inlet of the air preheater bypass module 2 is arranged between the pre-economizer module 1 and an air preheater 6 and is communicated with a flue, the outlet of the air preheater bypass module 2 is communicated with the flue behind the air preheater, and the air temperature regulating module 4 is arranged at the outlet of hot primary air;
the air preheater bypass module 2 comprises a bypass flue 21, a bypass high-temperature heat exchanger 22 and a bypass low-temperature heat exchanger 23, wherein a bypass adjusting baffle 23 is arranged in the bypass flue 21, a flue gas adjusting baffle 51 is arranged on the flue gas side of the air preheater 6, circulating water and flue gas heat exchange are adopted in the bypass high-temperature heat exchanger 22 and the bypass low-temperature heat exchanger 23, the bypass high-temperature heat exchanger 22 is communicated with high-pressure water supply of a boiler system, and the bypass low-temperature heat exchanger 23 heats condensed water of a turbine unit.
The cold air heating module 3 comprises a steam high-temperature air heater 31, a drainage cooling air heater 32 and a heat medium water air preheater 33, wherein the steam high-temperature air heater 31 and the drainage cooling air heater 32 are arranged on the air side, the heat medium water air preheater 33 comprises an air side heat exchanger 331 and a flue gas side heat exchanger 332 which are communicated with each other, the flue gas side heat exchanger 332 is used for absorbing the heat of flue gas at the outlet of the air preheater and transferring the heat to the air side heat exchanger 331 so as to heat air at the air side;
The air temperature adjusting module 4 is used for heating hot primary air, and the air temperature adjusting module 4 is arranged at an air side outlet of the air preheater.
As an alternative embodiment, the air temperature adjusting module 4 may adopt three or four extraction steam of the turbine set to heat cold primary air, the air temperature adjusting heat exchanger 41 is arranged at the outlet of the hot primary air, the working medium inlet of the air temperature adjusting heat exchanger 41 is communicated with the three or four extraction pipeline of the turbine set, and the working medium outlet of the air temperature adjusting heat exchanger 41 is communicated with the No. 3 high-pressure heater.
When the air temperature adjusting module 4 adopts three or four drawers of the turbine unit as a heat source, the three or four drawers of steam of the turbine still become superheated steam after heating the hot primary air, the downstream of the superheated steam is sent to the No. 3 high-pressure heater, and the three or four drawers of steam are adopted to heat the hot primary air and cancel the external steam cooler on the side 3 of the turbine.
The heat source of the air temperature adjusting module 4 may also come from a high-temperature hot air preheater 42, and the high-temperature hot air preheater 42 and the heating surfaces of the low-temperature superheater, the low-temperature reheater or the economizer 10 are arranged in the same flue without a bypass.
Example 2
Referring to fig. 2, in order to make more full use of heat, according to embodiment 1, a cold end heat exchanger 34 is disposed at the air side inlet, the cold end heat exchanger 34 is connected to a circulating water pipeline of a cooling tower, the cold end heat exchanger 34 exchanges heat with circulating water of the cooling tower and air at the air side inlet to perform preliminary heating on the air, an inlet of the cold end heat exchanger 34 is connected to a circulating water supply main pipe of the cooling tower, an outlet of the cold end heat exchanger is connected to a circulating water return main pipe of the cooling tower, and circulating water of various cooling towers such as an indirect cooling tower and a mechanical ventilation cooling tower are adopted as heat sources.
Example 3
Referring to fig. 1 and 3, according to embodiment 1, the present embodiment provides a powder feed heating module 5 on the coal mill to boiler fuel inlet line.
Of course, as an alternative embodiment, the heat source of the powder feeding heating module 5 can come from the air preheater bypass module 2 or the steam turbine for steam extraction, and can also come from the air preheater bypass module 2 and the steam turbine for steam extraction at the same time. The powder feeding heating module 5 adopts a sleeve type pressure-bearing powder feeding pipeline, the interior of the sleeve is provided with a wind powder mixture, and steam or hot water is arranged between the pipes.
When the heat source of the powder feeding heating module 5 comes from the steam turbine for steam extraction, the drainage of the steam turbine for steam extraction returns to the deaerator, and the steam turbine for steam extraction adopts four pumps.
When the heat source of the powder feeding heating module 5 comes from the air preheater bypass module 2, the heating medium inlet and outlet are communicated with the circulating water inlet and outlet of the air preheater bypass module 2, and in particular, the powder feeding heating module 5 heating medium inlet and outlet are communicated with the circulating water inlet and outlet of the bypass low-temperature heat exchanger 23.
Example 4
Referring to fig. 1 and 4, based on embodiment 1, the pre-economizer module 1 is arranged upstream of an original boiler economizer in steam-water flow, an inlet of the pre-economizer module 1 is a steam turbine for high-pressure water supply, and an outlet of the pre-economizer module is connected to the original boiler economizer, in this embodiment, the pre-economizer module 1 is provided with a water bypass, and the water bypass comprises a regulating valve, a shutoff valve and a connecting pipeline, and the water bypass is communicated with the pre-economizer module 1 and the original boiler economizer.
The heat source of the air temperature adjusting module 4 comes from a high-temperature hot air preheater 42, and the high-temperature hot air preheater 42 and the heating surfaces of the low-temperature superheater, the low-temperature reheater or the economizer 10 and the like are arranged in the same flue without a bypass.
Example 5
Based on embodiments 1,2 and 3, the bypass heat exchanger heat of the air preheater bypass module 2 has three conditions that ① is that the heat is only sent to the powder feeding heating module 5, ② is that the heat is sent to the powder feeding heating module 5 and the high-pressure water on the turbine side, ③ is that the heat is sent to the high-pressure water and the condensate on the turbine side, the air preheater bypass module 2 comprises a bypass flue 21, a bypass high-temperature heat exchanger 22 and a bypass low-temperature heat exchanger 23, a bypass regulating baffle 23 is arranged in the bypass flue 21, a flue gas regulating baffle 51 is arranged on the flue gas side of the air preheater 6, circulating water and flue gas heat exchange is adopted in the bypass high-temperature heat exchanger 22 and the bypass low-temperature heat exchanger 23, wherein the bypass high-temperature heat exchanger 22 is communicated with the high-pressure water of the boiler system, and the bypass low-temperature heat exchanger 23 heats the condensate of the turbine set.
The cold air heating module 3 comprises any one, two or more of a hot medium water air preheater, a steam high-temperature hot air heater, a drainage cooling hot air heater and a cold end heat exchanger, wherein the hot medium water air preheater comprises an air side heat exchanger and a flue gas side heat exchanger, the flue gas side heat exchanger is arranged in a downstream flue of the air preheater, the flue gas side heat exchanger enters the air side heat exchanger after heating water, hot water in the air side heat exchanger exchanges heat with air and then enters the flue gas side heat exchanger, the steam high-temperature hot air heater is arranged at the downstream of the air side, a heat medium of the steam high-temperature hot air heater is from five pumps or six pumps, and a heat source of the flue gas side heat exchanger is flue gas at an outlet of the air preheater, and reference is made to fig. 5.
The steam high-temperature air heater is communicated with the drainage cooling air heater through a drainage pipeline, the heat source of the steam high-temperature air heater is steam extraction of a steam turbine unit, the heat source of the drainage cooling air heater is drainage of a steam high Wen Nuanfeng unit, the steam high-temperature air heater is arranged at the downstream of the heat medium water air preheater, and the drainage cooling air heater is arranged at the upstream of the heat medium water air preheater.
According to the invention, by arranging the pre-economizer module 1, the powder feeding heating module 5 and the air preheater bypass module 2, part or all of heat is regenerated to the boiler, and the rest part is recovered to the steam turbine.
The maximization of the heat exchange heat of the air is realized through the cold end heat exchanger 34 of the cold air heating module 3, the hot water air preheater 33, the steam high Wen Nuanfeng heater 31 and the drain cooling air heater 32, and referring to fig. 5.
The air temperature adjusting module 4 realizes that the temperature of hot air meets the drying output requirement of the coal mill.
Although the invention has been described above with reference to the accompanying drawings, the invention is not limited to the above-described embodiments, which are given by way of illustration only and not by way of limitation, and many variations can be made by a person skilled in the art without departing from the spirit of the invention and the scope of the claims, which are all within the scope of the invention as defined in the appended claims.
Claims (4)
1. A generalized heat regeneration system of a boiler is characterized by comprising a pre-economizer module (1), an air pre-heater bypass module (2), a cold air heating module (3) and an air temperature regulating module (4), wherein the pre-economizer module (1) and the air pre-heater bypass module (2) are arranged at the downstream of an original boiler economizer along the flue gas flow direction, the inlet of the air pre-heater bypass module (2) is arranged between the pre-economizer module (1) and the air pre-heater (6) and is communicated with a flue, the outlet of the air pre-heater bypass module (2) is communicated with the flue behind the air pre-heater, the air temperature regulating module (4) is arranged at a hot primary air outlet at the air side of the air pre-heater (6), the cold air heating module (3) is arranged on a path before the cold primary air enters the air pre-heater (6), the cold air heating module (3) is used for acquiring heat of flue gas, steam turbine extraction or condensation water, the inlet of the pre-economizer module (1) is communicated with a high-pressure coal pipeline, the outlet of the pre-economizer module (1) is communicated with the flue, the outlet of the air pre-heater module (2) is communicated with the inlet of the air pre-heater module (2) by the water heater module (5) through the water inlet of the air heater bypass module (5), the boiler is characterized in that the boiler comprises a boiler body, a preheating economizer module (1) and an air preheater bypass module (2), a cold air heating module (3) and an air temperature adjusting module (4), wherein the preheating economizer module (1) and the air preheater bypass module (2) are connected with an air preheater bypass module (2) and a steam turbine steam extraction pipeline, high-pressure water supply is heated to an upper limit temperature by utilizing smoke heat, steam turbine steam extraction and/or condensate heat, cold air is heated to a cold air inlet upper limit temperature allowed by the air preheater by utilizing smoke heat and an air temperature adjusting module (4), part or all of heat is recovered to the boiler body by the preheating economizer module (1) and the air preheater bypass module (2), heat which is not recovered to the boiler body is recovered to a steam turbine by the preheating economizer module (1) and the air preheater bypass module (2), and pulverized coal is heated to the upper limit temperature of the hearth body by the steam turbine steam extraction or the flue gas bypass heat, and the pulverized coal is heated to the upper limit temperature of the hearth body by the steam turbine steam extraction and the flue gas bypass heat.
2. The generalized heat recovery system of an engine furnace according to claim 1, wherein the bypass module (2) of the air preheater comprises a bypass flue (21), a bypass high-temperature heat exchanger (22) and a bypass low-temperature heat exchanger, a bypass adjusting baffle is arranged in the bypass flue (21), a flue gas adjusting baffle (51) is arranged on the flue gas side of the air preheater (6), circulating water and flue gas heat exchange are adopted in the bypass high-temperature heat exchanger (22) and the bypass low-temperature heat exchanger, the bypass high-temperature heat exchanger (22) is communicated with high-pressure water supply of a boiler system, and the bypass low-temperature heat exchanger heats condensed water of a turbine unit.
3. The generalized heat regeneration system of a machine furnace according to claim 1, wherein the air temperature regulating module (4) adopts steam turbine extraction as a heat source, the air temperature regulating module (4) is communicated with a steam turbine extraction pipeline and a No.3 high-pressure heater, or a high-temperature hot air preheater (42) is arranged in parallel with a heating surface of the low-temperature superheater, the low-temperature reheater or the economizer (10) as a heat source, and an air side outlet of the air preheater (6) is communicated with the high-temperature hot air preheater (42).
4. The generalized heat regeneration system of an engine furnace according to claim 1, wherein the pre-economizer module (1) is provided with a water bypass comprising a regulating valve, a shut-off valve and a connecting pipe, said water bypass communicating the pre-economizer module (1) with the economizer (10).
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN207936048U (en) * | 2017-12-26 | 2018-10-02 | 福建龙净环保股份有限公司 | A kind of tail flue gas heat energy utilization system of coal-burning power plant |
| CN111140870A (en) * | 2020-01-17 | 2020-05-12 | 中国电力工程顾问集团西北电力设计院有限公司 | Low-quality heat utilization system of machine furnace |
| CN214745668U (en) * | 2021-03-08 | 2021-11-16 | 中国电力工程顾问集团西北电力设计院有限公司 | Heat regeneration system of machine furnace |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN207936048U (en) * | 2017-12-26 | 2018-10-02 | 福建龙净环保股份有限公司 | A kind of tail flue gas heat energy utilization system of coal-burning power plant |
| CN111140870A (en) * | 2020-01-17 | 2020-05-12 | 中国电力工程顾问集团西北电力设计院有限公司 | Low-quality heat utilization system of machine furnace |
| CN214745668U (en) * | 2021-03-08 | 2021-11-16 | 中国电力工程顾问集团西北电力设计院有限公司 | Heat regeneration system of machine furnace |
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