CN213746684U - Furnace water recirculation system for preventing over-temperature of water cooled wall of furnace under low load - Google Patents
Furnace water recirculation system for preventing over-temperature of water cooled wall of furnace under low load Download PDFInfo
- Publication number
- CN213746684U CN213746684U CN202022715934.7U CN202022715934U CN213746684U CN 213746684 U CN213746684 U CN 213746684U CN 202022715934 U CN202022715934 U CN 202022715934U CN 213746684 U CN213746684 U CN 213746684U
- Authority
- CN
- China
- Prior art keywords
- water
- wall
- furnace
- bypass
- economizer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
Abstract
The utility model discloses a prevent furnace water recirculation system of furnace water-cooling wall overtemperature under low-load, the system mixes header, water-cooling wall lower header and economizer in the middle of boiler water circulating pump, catch water, main water storage tank, the water-cooling wall. The economizer, the water wall lower header, the water wall middle mixing header and the steam-water separator are sequentially connected through pipelines, an economizer inlet pipeline of the economizer is connected with a water supply pipe, and a gas outlet of the steam-water separator is connected to the superheater; the liquid outlet of the steam-water separator, the main water storage tank and the boiler water circulating pump are sequentially connected and connected to an inlet pipeline of the economizer; the mixing header in the middle of the water-cooled wall is connected with a bypass water storage tank through a bypass water delivery branch pipe, and a water outlet of the bypass water storage tank is connected with an inlet of a furnace water circulating pump. The system can avoid overtemperature and large-amplitude fluctuation of wall temperature of the water cooled wall caused by low flow of low-load working medium, and can relieve the problems of transverse cracks and the like.
Description
Technical Field
The utility model belongs to the technical field of coal-fired thermal power factory equipment safety, concretely relates to prevent furnace water recirculation system of furnace water-cooling wall overtemperature under low-load.
Background
With the continuous improvement of the proportion of new energy, the coal-fired unit participates in deep peak regulation and frequent load lifting, the fluctuation frequency and amplitude of working medium parameters in the water-cooled wall are large, the wall temperature deviation of the same-screen water-cooled wall is large, large thermal stress is generated, transverse cracks on the fire side of the water-cooled wall are caused by fatigue stress in the running process of a plurality of supercritical (super) direct current boilers, even leakage and furnace shutdown are caused, and the safety and stability of the unit are seriously threatened.
Under the low-load working condition of the boiler, the flame fullness of the hearth is poor, the flow of working media is low, the hydrodynamic characteristics are poor, the conditions of over-temperature of a water cooling wall and large wall temperature fluctuation are easy to occur, and particularly, the phenomena of over-temperature of the water cooling wall and large wall temperature fluctuation are more prominent when the wet-state of the once-through boiler is converted into the dry-state.
The prior art mainly reduces the superheat degree and modifies the water wall inlet throttling hole ring, is influenced by the combustion characteristic and the load characteristic in a furnace, is easy to transfer a high-temperature area to an unmodified area, and cannot effectively solve the problems of wall temperature overtemperature and large fluctuation.
SUMMERY OF THE UTILITY MODEL
To the problem that prior art's wall temperature overtemperature and fluctuation are big, the utility model aims to provide a prevent furnace water recirculation system of furnace water-cooling wall overtemperature under the low-load, this system can avoid surging by a wide margin because of the low water-cooling wall overtemperature and the wall temperature that causes of low-load working medium flow, alleviates water-cooling wall lateral crack scheduling problem.
In order to achieve the above object, the utility model discloses the technical scheme that the device adopted does:
a furnace water recirculation system for preventing furnace water wall overtemperature under low load, comprising: the system comprises a boiler water circulating pump, an economizer, a water-cooled wall lower header, a water-cooled wall middle mixing header, a steam-water separator, a bypass water delivery branch pipe, a bypass water storage tank, an economizer inlet pipeline and a main water storage tank;
the economizer, the water wall lower header, the water wall middle mixing header and the steam-water separator are sequentially connected through pipelines, an economizer inlet pipeline of the furnace water circulating pump is connected with a water supply pipe, and a gas outlet of the steam-water separator is connected to the superheater;
the liquid outlet of the steam-water separator is sequentially connected with the main water storage tank and the furnace water circulating pump; the water outlet of the boiler water circulating pump is connected with an inlet pipeline of the coal economizer;
the mixed header is connected with bypass water delivery branch pipe in the middle of the water-cooled wall, the bypass water delivery branch pipe is connected with a bypass water storage tank, and the outlet of the bypass water storage tank is connected with the inlet of the furnace water circulating pump.
As a further improvement of the utility model, mix the collection case in the middle of the water-cooling wall including the middle collection case that mixes of front wall water-cooling wall, mix the collection case in the middle of the left side wall water-cooling wall, mix the collection case in the middle of the back wall water-cooling wall, mix the collection case in the middle of the right side wall water-cooling wall, four ways bypass water delivery branch pipe entry mixes the collection case in the middle of the front wall water-cooling wall, mix the collection case in the middle of the left side wall water-cooling wall, mix the collection case in the middle of the back wall water-cooling wall, mix the collection case in the middle of the right side wall water-cooling wall and link to each other respectively, four ways bypass water delivery branch pipe export links to each other with the bypass water storage tank.
As a further improvement, the four-way bypass water delivery branch pipe is provided with a flowmeter and a flow regulating valve.
As a further improvement of the utility model, the flowmeter and a flow control valve are connected with the remote controller.
As a further improvement of the utility model, the bypass water storage tank is connected with the inlet of the furnace water circulating pump through a bypass water pipeline.
As a further improvement, the bypass water pipe is provided with a bypass stop valve.
As a further improvement, the original pipeline between the steam-water separator and the boiler water circulating pump is provided with a stop valve.
As a further improvement of the utility model, a first stop valve is arranged on an outlet pipe of the furnace water circulating pump.
A control method of a furnace water recirculation system for preventing over-temperature of a hearth water-cooled wall under low load comprises the following steps:
feed water sequentially enters the economizer, the lower header of the water-cooled wall, the middle mixing header of the water-cooled wall and the steam-water separator through an economizer inlet pipeline; the steam enters a superheated steam heating system through a steam-water separator;
the water-cooled wall middle mixing header also collects wet water through a bypass water delivery branch pipe to enter a bypass water storage tank;
and pumping the wet water of the bypass water storage tank into an inlet pipeline of the economizer through a boiler water circulating pump, mixing the wet water with feed water, raising the temperature of the mixed water, feeding the heated mixed water into the economizer, heating the mixed water by the economizer, and feeding the heated mixed water into a water-cooled wall of a lower hearth.
Compared with the prior art, the utility model has the advantages of it is following:
the utility model relates to a boiler water recirculation system for preventing the overtemperature of a water wall of a furnace under low load, which is formed by connecting an economizer, a lower header of the water wall, a middle mixing header of the water wall and a steam-water separator in sequence by pipelines, wherein an economizer inlet pipeline of the economizer is connected with a water supply pipe, and a gas outlet of the steam-water separator is connected with an overheater; the liquid outlet of the steam-water separator, the main water storage tank and the boiler water circulating pump are sequentially connected and connected to an inlet pipeline of the economizer; the mixing header in the middle of the water-cooled wall is connected with a bypass water storage tank through a bypass water delivery branch pipe, and a water outlet of the bypass water storage tank is connected with an inlet of a furnace water circulating pump. A water conveying pipeline is additionally arranged between a mixing header in the middle of the water-cooled wall and a boiler water circulating pump, part of wet water in the middle header is conveyed to an inlet pipeline of an economizer, mixed with feed water and then enters the economizer, the mixture is heated by the economizer and then enters the water-cooled wall of the lower hearth, the working medium flow of the water-cooled wall of the lower hearth is increased, the problems of over-temperature and great fluctuation of wall temperature of the water-cooled wall caused by low-load working medium flow are avoided, and transverse cracks and the like are relieved. The system can avoid overtemperature and large-amplitude fluctuation of wall temperature of the water cooled wall caused by low flow of low-load working medium, and can relieve the problems of transverse cracks and the like. The system has simple structure, can effectively increase the working medium flow of the water cooled wall of the lower hearth, reduces the fluctuation range of the wall temperature of the low-load water cooled wall of the supercritical (super) direct-current boiler, and improves the safety and stability of the unit.
Further, the utility model discloses can improve economize coal entry temperature, reduce high pressure feed water heater steam extraction volume, improve unit economic nature.
Further, the utility model discloses can improve economizer export gas temperature, alleviate the low-load because the flue gas temperature crosses the low denitration catalyst activity that causes and reduces, denitration inefficiency and the high problem of ammonia escape excessively.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural view of a furnace water recirculation system capable of preventing the water cooling wall of a low-load furnace from being over-heated.
In the figure: 1-boiler water circulating pump, 2-front wall water-cooled wall middle mixing header, 3-left wall water-cooled wall middle mixing header, 4-rear wall water-cooled wall middle mixing header, 5-right wall water-cooled wall middle mixing header, 6-bypass water conveying branch pipe, 7-flowmeter, 8-flow regulating valve, 9-bypass water storage tank, 10-bypass water conveying pipeline, 11-bypass stop valve, 12-economizer 18 inlet pipeline, 13-first stop valve, 14-second stop valve, 15-main water storage tank, 16-steam-water separator, 17-water-cooled wall lower header and 18-economizer.
Detailed Description
In order to make the purpose and technical scheme of the utility model clearer and more convenient to understand. The present invention will be described in further detail with reference to the following drawings and examples, wherein the specific examples are provided for the purpose of illustration only and are not intended to be limiting.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified. In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The invention will be described in further detail with reference to the following figures and specific embodiments:
as shown in fig. 1, the utility model provides a prevent furnace water recirculation system of over-temperature of under-load furnace water-cooling wall, including furnace water circulating pump 1, mix collection case 2 in the middle of the front wall water-cooling wall, mix collection case 3 in the middle of the left wall water-cooling wall, mix collection case 4 in the middle of the back wall water-cooling wall, mix collection case 5 in the middle of the right wall water-cooling wall, bypass water delivery branch pipe 6, flowmeter 7, flow control valve 8, bypass water storage tank 9, bypass water pipeline 10, bypass stop valve 11, economizer inlet pipeline 12, first stop valve 13, second stop valve 14, main water storage tank 15.
The inlet of the furnace water circulating pump 1 is connected with the middle mixing header 2/3/4/5 of the water wall, and the outlet of the furnace water circulating pump is connected with the inlet pipeline 12 of the coal economizer;
the communicating pipeline between the furnace water circulating pump 1 and the water-cooled wall middle mixing header is divided into four-way bypass water conveying branch pipes 6 and 1-way bypass water conveying pipeline, the inlets of the 4-way bypass water conveying branch pipes are respectively connected with the front wall water-cooled wall middle mixing header 2, the left wall water-cooled wall middle mixing header 3, the rear wall water-cooled wall middle mixing header 4 and the right wall water-cooled wall middle mixing header 5, and the outlets of the branch pipes are connected with the bypass water storage tank 9; the inlet of the bypass water pipe 10 is connected with the water storage tank 9, and the outlet of the bypass water pipe 10 is connected with the inlet of the furnace water circulating pump 1.
The utility model discloses an add conduit between mixed collection case and the stove water circulating pump in the middle of the water-cooling wall, will middle collection case part wet water carry to 18 inlet pipe of economizer, mix with the feedwater and get into economizer 18 after, get into down the furnace water-cooling wall after 18 heats of economizer once more, increase the working medium flow of furnace water-cooling wall down.
As a preferred embodiment, a flow meter 7 and a flow control valve 8 are respectively arranged on the four water conveying branch pipes 6 and used for adjusting the water flow from a mixing header in the middle of a four-sided wall water-cooled wall to a water storage tank, and a bypass stop valve 11 is arranged on a main pipe between the water storage tank and a furnace water circulating pump.
The utility model discloses can also realize remote automation control, can be connected with remote control ware like flowmeter 7 and a flow control valve 8, realize remote monitoring and control.
A stop valve 14 is additionally arranged on an original pipeline between the steam-water separator 16 and the boiler water circulating pump, so that working media in the separator are prevented from entering the boiler water circulating pump when the low-load system is put into operation.
The outlet of the boiler water circulating pump 1 is connected with the economizer inlet pipeline 12 through a water conveying pipeline, and wet water in the water-cooled wall middle header is introduced into the economizer inlet pipeline 12. The water temperature at the coal-saving inlet can be improved, the steam extraction amount of the high-pressure heater is reduced, and the economical efficiency of the unit is improved. Furthermore, the temperature of the smoke at the outlet of the economizer can be increased, and the problems of low denitration catalyst activity, low denitration efficiency and high ammonia escape caused by too low smoke temperature in low load are solved.
The principle of the utility model is that: a water conveying pipeline is additionally arranged between a middle mixing header of the water-cooled wall and a boiler water circulating pump, part of wet water in the middle header is conveyed to an inlet pipeline of an economizer 18, mixed with feed water and then enters the economizer 18, the mixture is heated by the economizer 18 and then enters the water-cooled wall of the lower hearth, the working medium flow of the water-cooled wall of the lower hearth is increased, the overtemperature and the great fluctuation of the wall temperature of the water-cooled wall caused by low-load working medium flow are avoided, and the problems of transverse cracks and the like are relieved.
The utility model also provides a control method of furnace water recirculation system who prevents furnace water-cooling wall overtemperature under the low-load, including following step:
feed water sequentially enters an economizer 18, a water-cooled wall lower header 17, a water-cooled wall middle mixing header and a steam-water separator 16 through an economizer inlet pipeline 12; the steam enters a superheated steam heating system after passing through a steam-water separator 16;
the water-cooled wall middle mixing header also collects wet water through a bypass water delivery branch pipe 6 and enters a bypass water storage tank 9;
the wet water of the bypass water storage tank 9 is pumped into an economizer inlet pipeline 12 through a boiler water circulating pump 1, the temperature of the water is increased after the water is mixed with feed water, the mixed water after temperature rise enters an economizer 18, and the mixed water enters a water-cooled wall of a lower hearth after being heated by the economizer 18.
The above contents are only for explaining the technical idea of the present invention, and the protection scope of the present invention cannot be limited thereby, and any modification made on the basis of the technical solution according to the technical idea of the present invention all fall within the protection scope of the claims of the present invention.
Claims (8)
1. A furnace water recirculation system for preventing over-temperature of a furnace water wall under low load is characterized by comprising: the system comprises a boiler water circulating pump, an economizer, a water-cooled wall lower header, a water-cooled wall middle mixing header, a steam-water separator, a bypass water delivery branch pipe, a bypass water storage tank, an economizer inlet pipeline and a main water storage tank;
the economizer, the water wall lower header, the water wall middle mixing header and the steam-water separator are sequentially connected through pipelines, an economizer inlet pipeline of the furnace water circulating pump is connected with a water supply pipe, and a gas outlet of the steam-water separator is connected to the superheater;
the liquid outlet of the steam-water separator is sequentially connected with the main water storage tank and the furnace water circulating pump; the water outlet of the boiler water circulating pump is connected with an inlet pipeline of the coal economizer;
the mixed header is connected with bypass water delivery branch pipe in the middle of the water-cooled wall, the bypass water delivery branch pipe is connected with a bypass water storage tank, and the outlet of the bypass water storage tank is connected with the inlet of the furnace water circulating pump.
2. The furnace water recycling system for preventing over-temperature of furnace water-cooled walls under low load as claimed in claim 1, wherein said water-cooled wall intermediate mixing header comprises a front wall water-cooled wall intermediate mixing header, a left wall water-cooled wall intermediate mixing header, a rear wall water-cooled wall intermediate mixing header, a right wall water-cooled wall intermediate mixing header, four-way bypass water-feeding branch inlets are connected with the front wall water-cooled wall intermediate mixing header, the left wall water-cooled wall intermediate mixing header, the rear wall water-cooled wall intermediate mixing header and the right wall water-cooled wall intermediate mixing header respectively, and four-way bypass water-feeding branch outlets are connected with the bypass water storage tank.
3. The furnace water recirculation system for preventing the over-temperature of the water wall of the hearth under the low load as claimed in claim 2, wherein the four bypass water delivery branch pipes are provided with flow meters and flow regulating valves.
4. The furnace water recirculation system for preventing over-temperature of furnace water wall under low load of claim 3, wherein said flow meter and a flow control valve are connected to a remote controller.
5. The furnace water recirculation system for preventing the overtemperature of the water wall of the hearth under the low load as recited in claim 1, wherein the bypass water storage tank is connected with an inlet of a furnace water circulation pump through a bypass water conveying pipeline.
6. The furnace water recirculation system for preventing the overtemperature of the water cooled wall of the hearth under the low load as recited in claim 5, characterized in that a bypass stop valve is arranged on the bypass water pipeline.
7. The furnace water recirculation system for preventing the overtemperature of the water cooled wall of the hearth under the low load as recited in claim 1, characterized in that a stop valve is arranged on an original pipeline between the steam-water separator and the furnace water circulating pump.
8. The furnace water recirculation system for preventing the overtemperature of the water wall of the furnace under the low load as recited in claim 1, wherein a first stop valve is arranged on an outlet pipe of the furnace water circulation pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022715934.7U CN213746684U (en) | 2020-11-21 | 2020-11-21 | Furnace water recirculation system for preventing over-temperature of water cooled wall of furnace under low load |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022715934.7U CN213746684U (en) | 2020-11-21 | 2020-11-21 | Furnace water recirculation system for preventing over-temperature of water cooled wall of furnace under low load |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213746684U true CN213746684U (en) | 2021-07-20 |
Family
ID=76827467
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022715934.7U Active CN213746684U (en) | 2020-11-21 | 2020-11-21 | Furnace water recirculation system for preventing over-temperature of water cooled wall of furnace under low load |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213746684U (en) |
-
2020
- 2020-11-21 CN CN202022715934.7U patent/CN213746684U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112283690A (en) | Furnace water recirculation system and method for preventing over-temperature of water cooled wall of hearth under low load | |
| US10968784B2 (en) | Flexible coal-fired power generation system and operation method thereof | |
| CN102434868B (en) | 660MW grade supercritical boiler | |
| CN109405288B (en) | Heating furnace flue gas waste heat recovery device for oil field | |
| CN213746684U (en) | Furnace water recirculation system for preventing over-temperature of water cooled wall of furnace under low load | |
| CN106765039A (en) | A kind of SCR inlet flue gas water side temperature raising system and method | |
| CN116336450A (en) | Flexible high-efficiency novel coal-fired generator set | |
| CN113405086B (en) | Steam mixing system for realizing denitration and temperature raising and adjusting method thereof | |
| CN212319770U (en) | Air heater operation potential safety hazard elimination system | |
| CN106705019A (en) | Wide-load efficient water supply regenerative system | |
| CN209213887U (en) | A kind of boiler shock wave soot-blowing system | |
| CN106382620A (en) | Low-pressure water supply system for steam extraction and backheating of power station unit | |
| CN111780097A (en) | Ultra-supercritical circulating fluidized bed boiler screen type heating surface with intermediate mixing header and boiler | |
| CN205955783U (en) | Draw gas low -pressure system of heating boiler feedwater of power station steam turbine | |
| CN104807338A (en) | Coal gas, converter steam and sintering waste heat combined power generation device and waste heat utilization method | |
| CN219841556U (en) | External gas-gas heat exchanger | |
| CN215570549U (en) | Coal-fired power generation system with flue gas duct connecting device | |
| CN217131265U (en) | Circulating fluidized bed external heat exchanger capable of reducing thermal deviation | |
| CN219333736U (en) | Denitration inlet flue connecting device for thermal power plant flexibility peak shaving | |
| CN209588367U (en) | A kind of horizontal three return smokes fire pipe water heating boiler | |
| CN210511637U (en) | Superheated steam boiler | |
| CN215336289U (en) | Low-temperature economizer and circulating fluidized bed boiler | |
| CN216868459U (en) | Straight-flow coil type steam generator | |
| CN103353104A (en) | Design method of low mass flow velocity water circulation system for opposed firing boiler | |
| CN103438420B (en) | Control the method for overtemperature of W-type flame supercritical once-through boiler water wall tube |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |