CN111140863A - Flue gas passage system capable of meeting low-load denitration of adjacent furnaces and enabling flues to be mutually standby - Google Patents
Flue gas passage system capable of meeting low-load denitration of adjacent furnaces and enabling flues to be mutually standby Download PDFInfo
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- CN111140863A CN111140863A CN202010166518.8A CN202010166518A CN111140863A CN 111140863 A CN111140863 A CN 111140863A CN 202010166518 A CN202010166518 A CN 202010166518A CN 111140863 A CN111140863 A CN 111140863A
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- flue gas
- denitration
- boiler
- gas passage
- gas channel
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J11/00—Devices for conducting smoke or fumes, e.g. flues
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
- B01D53/8631—Processes characterised by a specific device
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L11/00—Arrangements of valves or dampers after the fire
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J2215/00—Preventing emissions
- F23J2215/10—Nitrogen; Compounds thereof
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Biomedical Technology (AREA)
- Health & Medical Sciences (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Chimneys And Flues (AREA)
Abstract
The invention discloses a flue gas passage system for meeting the requirements of low-load denitration of adjacent furnaces and mutual standby of flues, and relates to the technical field of low-load denitration of single-auxiliary-machine boilers and improvement of unit safety, in particular to a flue gas passage system for meeting the requirements of low-load denitration of adjacent furnaces and mutual standby of flues, which comprises two adjacent single-auxiliary-machine boilers, namely a first single-auxiliary-machine boiler and a second single-auxiliary-machine boiler; according to the invention, the first flue gas channel and the second flue gas channel are connected through the flue gas channel, so that when the load of one single auxiliary engine boiler is low and can not meet the denitration requirement, high-temperature flue gas is introduced from the other single auxiliary engine boiler through the flue gas channel to improve the denitration temperature of the single auxiliary engine boiler; simultaneously, the smoke passage plays a role of mutual standby equipment for the first smoke passage and the second smoke passage follow-up equipment, the defect that the single auxiliary boiler is lack of standby equipment is overcome, and the safety of the unit is greatly improved.
Description
Technical Field
The invention relates to the technical field of low-load denitration of a single auxiliary boiler and improvement of unit safety, in particular to a flue gas passage system which meets the requirements of low-load denitration of adjacent boilers and mutual standby of flues.
Background
According to the relevant national requirements, the peak regulation capacity of each thermal power unit is reduced from 50% to 30%, otherwise, a grid-connected protocol is newly signed, and the new energy installation is continuously and greatly increased at present, so that the thermal power unit needs to be subjected to flexible peak regulation transformation from policies and market adaptation capacity. The problem that the denitration temperature of the thermal power generating unit is adjusted from 50% to 30% is not up to the temperature required by the catalyst, so that the temperature of the denitration inlet must be increased through related modification, but the modification cost is relatively high.
Disclosure of Invention
In order to solve the problems, the invention provides the flue gas passage system which has a simple structure and low cost, meets the requirements on low-load denitration temperature, and improves the safety of a unit, meets the requirements on low-load denitration of adjacent furnaces and has mutually spare flues.
The invention relates to a flue gas passage system for meeting low-load denitration of adjacent furnaces and enabling flues to be mutually standby, which comprises two adjacent single-auxiliary-machine boilers, namely a first single-auxiliary-machine boiler and a second single-auxiliary-machine boiler, wherein the first single-auxiliary-machine boiler is connected with a first flue gas channel, the second single-auxiliary-machine boiler is connected with a second flue gas channel, the first flue gas channel is communicated with the second flue gas channel through a flue gas passage, and a flue gas flow regulating device is arranged on the flue gas passage.
Preferably, one end of the flue gas passage is connected with the tail part of the first flue gas channel, and the other end of the flue gas passage is connected with the tail part of the second flue gas channel.
Or preferably, the flue gas flow regulating device comprises a flue gas electric door which opens or closes between the first flue gas channel and the second flue gas channel;
the flue gas adjusting valve is used for adjusting the flow of flue gas in the flue gas passage;
the flue gas electrically operated gate and flue gas governing door all set up on the flue gas passageway.
Preferably, the flue gas flow in the flue gas passage is 50% of the rated flue gas flow of the flue gas passage.
Preferably, a pressure transmitter and a thermocouple are arranged at the joint of the smoke passage and the first smoke channel.
Preferably, a pressure transmitter and a thermocouple are arranged at the joint of the smoke passage and the second smoke channel.
Preferably, the smoke electrically operated door is D-LD 2000-45306.
Preferably, the smoke damper is FA-1400 x 1200.
The single-auxiliary-machine boiler denitration system is simple in structure and low in cost, and the first flue gas channel and the second flue gas channel are connected through the flue gas channel, so that when the load of one single-auxiliary-machine boiler is low and the denitration requirement cannot be met, high-temperature flue gas is introduced from the other single-auxiliary-machine boiler through the flue gas channel to improve the denitration temperature of the single-auxiliary-machine boiler; simultaneously, the smoke passage plays a role of mutual standby equipment for the first smoke passage and the second smoke passage follow-up equipment, the defect that the single auxiliary boiler is lack of standby equipment is overcome, and the safety of the unit is greatly improved.
Drawings
FIG. 1 is a schematic view of the structure of the present invention.
Reference numerals: 1-a first single auxiliary boiler, 2-a second single auxiliary boiler, 3-a first flue gas channel, 4-a second flue gas channel, 5-a flue gas channel, 6-a flue gas electric door, 7-a flue gas adjusting door, 8-a denitration device, 9-an air preheater inlet baffle, 10-an air preheater, 11-a dust remover and 12-an induced draft fan.
Detailed Description
The invention relates to a flue gas passage system which meets the requirements of low-load denitration of adjacent furnaces and has mutually spare flues, which comprises two adjacent single-auxiliary-machine boilers, namely a first single-auxiliary-machine boiler 1 and a second single-auxiliary-machine boiler 2, wherein the first single-auxiliary-machine boiler 1 is connected with a first flue gas channel 3, the second single-auxiliary-machine boiler 2 is connected with a second flue gas channel 4, the first flue gas channel 3 is communicated with the second flue gas channel 4 through a flue gas passage 5, and a flue gas flow regulating device is arranged on the flue gas passage 5.
One end of the flue gas channel 5 is connected with the tail part of the first flue gas channel 3, and the other end of the flue gas channel 5 is connected with the tail part of the second flue gas channel 4.
The flue gas flow regulating device comprises a flue gas electric door 6 which opens or closes the space between the first flue gas channel 3 and the second flue gas channel 4;
the flue gas adjusting valve 7 is used for adjusting the flow of the flue gas in the flue gas passage 5;
the flue gas electrically operated gate 6 and the flue gas adjusting gate 7 are both arranged on the flue gas passage 5.
The flue gas flow in the flue gas passage 5 is 50% of the rated flue gas flow of the flue gas passage 5.
A pressure transmitter and a thermocouple are arranged at the joint of the smoke passage 5 and the first smoke channel 3.
A pressure transmitter and a thermocouple are arranged at the joint of the flue gas passage 5 and the second flue gas channel 4.
Specifically, the load cell can be a pressure transmitter of model SZ1151GP, the temperature measuring cell can be a thermocouple of model K, and a pressure transmitter of 3 models SZ1151GP and 5 thermocouples of model K are arranged at the joint of the smoke passage 5 and the first smoke passage 3 and the joint of the smoke passage 5 and the second smoke passage 4.
The smoke electric door 6 is D-LD 2000-45306. The smoke adjusting gate 7 is FA-1400X 1200.
The tail end of a first flue gas channel 3 on the first single auxiliary boiler 1 and the tail end of a second flue gas channel 4 of the second single auxiliary boiler 2 are sequentially connected with a denitration device 8, an air preheater 10, a dust remover 11 and an induced draft fan 12.
During the normal operation of the boiler, the first single auxiliary boiler 1 needs to be operated under reduced load, at the moment, the denitration device 8 on the first single auxiliary boiler 1 can not be operated due to the fact that the temperature cannot reach the temperature of a catalyst, at the moment, the negative pressure of the first single auxiliary boiler 1 is adjusted to enable the pressure at the joint of the first flue gas channel 3 and the flue gas channel 5 to be lower than the pressure at the joint of the second flue gas channel 4 and the flue gas channel 5 on the second single auxiliary boiler 2, then the flue gas electric door 6 on the flue gas channel 5 is opened, the flue gas flow entering the first flue gas channel 3 from the second flue gas channel 4 is adjusted through the flue gas adjusting door 7, and the temperature of the denitration device 8 of the first single auxiliary boiler 1 is enabled to be above 300 ℃; on the contrary, when the second single auxiliary boiler 2 is operated with reduced load, the negative pressure of the second single auxiliary boiler 2 is adjusted to make the pressure at the joint of the second flue gas channel 4 and the flue gas channel 5 lower than the pressure at the joint of the first flue gas channel 3 and the flue gas channel 5 on the first single auxiliary boiler 1, then the flue gas electric door 6 on the flue gas channel 5 is opened, the flue gas flow entering the second flue gas channel 4 from the first flue gas channel 3 is adjusted through the flue gas adjusting door 7, and the temperature of the denitration device 8 of the second single auxiliary boiler 2 is above 300 ℃.
In the normal operation process, the tail end of a first flue gas channel 3 on a first single auxiliary boiler 1 is connected with a denitration device 8, an air preheater 10, a dust remover 11 and an induced draft fan 12, and at the moment, the first single auxiliary boiler 1 and a second single auxiliary boiler 2 are adjusted to ensure that the loads of the first single auxiliary boiler 1 and the second single auxiliary boiler 2 are all near or below 50 percent, a flue gas electric door 6 and a flue gas adjusting door 7 on a flue gas channel 5 are opened, an inlet baffle 9 of the air preheater 10 connected with the first flue gas channel 3 is closed, at the moment, flue gas in the first flue gas channel 3 enters a second flue gas channel 4 through the flue gas channel 5, namely the second flue gas channel 4 is a spare flue of the first flue gas channel 3; on the contrary, in the normal operation process, the tail end of the second flue gas channel 4 on the second single auxiliary boiler 2 is connected with the denitration device 8, the air preheater 10, the dust remover 11 and the induced draft fan 12 are failed, at the moment, the second single auxiliary boiler 2 and the first single auxiliary boiler 1 are adjusted, the loads of the first single auxiliary boiler 1 and the second single auxiliary boiler 2 are both near or below 50%, the flue gas electric door 6 and the flue gas adjusting door 7 on the flue gas channel 5 are opened, the inlet baffle 9 of the air preheater 10 connected with the second flue gas channel 4 is closed, at the moment, the flue gas in the second flue gas channel 4 enters the first flue gas channel 3 through the flue gas channel 5, namely, the first flue gas channel 3 is a spare flue of the second flue gas channel 4.
Claims (8)
1. The utility model provides a satisfy adjacent stove low-load denitration and flue each other for reserve flue gas access system, includes two adjacent single auxiliary machinery boilers, is first single auxiliary machinery boiler (1) and second single auxiliary machinery boiler (2) respectively, be connected with first flue gas passageway (3) on first single auxiliary machinery boiler (1), be connected with second flue gas passageway (4) on second single auxiliary machinery boiler (2), its characterized in that, first flue gas passageway (3) are linked together through flue gas access (5) and second flue gas passageway (4), be provided with flue gas flow adjusting device on flue gas access (5).
2. The flue gas passage system for denitration under low load of adjacent furnaces and mutual backup of flues according to claim 1, characterized in that one end of the flue gas passage (5) is connected with the tail of the first flue gas channel (3), and the other end of the flue gas passage (5) is connected with the tail of the second flue gas channel (4).
3. The flue gas passage system for denitration of low load of adjacent furnaces and mutual backup of flues according to claim 1 or 2, characterized in that the flue gas flow regulating device comprises a flue gas electric door (6) for opening or closing between the first flue gas channel (3) and the second flue gas channel (4);
the flue gas adjusting valve (7) is used for adjusting the flow of flue gas in the flue gas passage (5);
the smoke electric door (6) and the smoke adjusting door (7) are both arranged on the smoke passage (5).
4. The flue gas passage system for denitration under low load of adjacent furnaces and mutual backup of flues according to claim 3, characterized in that the flue gas flow in the flue gas passage (5) is 50% of the rated flue gas flow of the flue gas passage (5).
5. The flue gas passage system applicable to the adjacent single auxiliary boiler flues which are mutually spare in claim 4 is characterized in that a pressure transmitter and a thermocouple are arranged at the joint of the flue gas passage (5) and the first flue gas channel (3).
6. The flue gas passage system for denitration under low load of adjacent furnaces and mutual backup of flues according to claim 5, characterized in that a pressure transmitter and a thermocouple are arranged at the joint of the flue gas passage (5) and the second flue gas channel (4).
7. The flue gas passage system for denitration of low load of adjacent furnaces and mutual backup of flues according to claim 6, characterized in that the flue gas electrically operated gate (6) is D-LD2000-45306 type.
8. The flue gas passage system for denitration of low load of adjacent furnaces and mutual backup of flues according to claim 7, characterized in that the flue gas adjusting door (7) is of the type FA-1400 x 1200.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010166518.8A CN111140863A (en) | 2020-03-11 | 2020-03-11 | Flue gas passage system capable of meeting low-load denitration of adjacent furnaces and enabling flues to be mutually standby |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010166518.8A CN111140863A (en) | 2020-03-11 | 2020-03-11 | Flue gas passage system capable of meeting low-load denitration of adjacent furnaces and enabling flues to be mutually standby |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111140863A true CN111140863A (en) | 2020-05-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010166518.8A Pending CN111140863A (en) | 2020-03-11 | 2020-03-11 | Flue gas passage system capable of meeting low-load denitration of adjacent furnaces and enabling flues to be mutually standby |
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| CN (1) | CN111140863A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112983576A (en) * | 2021-04-07 | 2021-06-18 | 西安热工研究院有限公司 | Modularized oxygen-enriched combustion power generation system with flexibly adjusted load and operation method thereof |
-
2020
- 2020-03-11 CN CN202010166518.8A patent/CN111140863A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112983576A (en) * | 2021-04-07 | 2021-06-18 | 西安热工研究院有限公司 | Modularized oxygen-enriched combustion power generation system with flexibly adjusted load and operation method thereof |
| CN112983576B (en) * | 2021-04-07 | 2022-08-30 | 西安热工研究院有限公司 | Modularized oxygen-enriched combustion power generation system with flexibly adjusted load and operation method thereof |
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