CN205208624U - A pressure control device for coal fired boiler furnace hopper - Google Patents
A pressure control device for coal fired boiler furnace hopper Download PDFInfo
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- CN205208624U CN205208624U CN201520839492.3U CN201520839492U CN205208624U CN 205208624 U CN205208624 U CN 205208624U CN 201520839492 U CN201520839492 U CN 201520839492U CN 205208624 U CN205208624 U CN 205208624U
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- furnace hopper
- furnace
- pressure
- hopper
- coal
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- 239000003245 coal Substances 0.000 title abstract description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 22
- 239000003546 flue gas Substances 0.000 claims abstract description 22
- 238000005070 sampling Methods 0.000 claims abstract description 21
- 239000007789 gas Substances 0.000 claims description 41
- 239000000523 sample Substances 0.000 claims description 17
- 238000003556 assay Methods 0.000 abstract 1
- 238000004880 explosion Methods 0.000 description 7
- 238000002485 combustion reaction Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000001105 regulatory effect Effects 0.000 description 4
- 229910001220 stainless steel Inorganic materials 0.000 description 4
- 239000010935 stainless steel Substances 0.000 description 4
- 230000009466 transformation Effects 0.000 description 4
- 239000000571 coke Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000004939 coking Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000010977 unit operation Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 206010021143 Hypoxia Diseases 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000009530 blood pressure measurement Methods 0.000 description 1
- 238000005474 detonation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 208000018875 hypoxemia Diseases 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
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- Regulation And Control Of Combustion (AREA)
Abstract
The utility model discloses a pressure control device for coal fired boiler furnace hopper, including setting up in the pressure sampling tube of furnace hopper the first half, the pressure sampling tube links to each other with pressure transmitter, and pressure transmitter links to each other with main control unit, pressure transmitter is used for detecting the pressure value of furnace hopper to convey to main control unit, set up in the flue gas sampling tube of furnace hopper the first half, the flue gas sampling tube links to each other with flue gas on line analyzer, and flue gas on line analyzer also links to each other with main control unit, flue gas on line analyzer is used for the interior gaseous content value of assay furnace hopper to convey to main control unit, set up in the stove bottom wind governing valve of furnace hopper the latter half, stove bottom wind governing valve links to each other with main control unit, main control unit is used for adjusting in real time the aperture of stove bottom wind governing valve according to content value gaseous in the pressure value of received furnace hopper and the furnace hopper.
Description
Technical field
The utility model relates to a kind of pressure control device, is specifically related to a kind of pressure control device for coal-burning boiler furnace hopper.
Background technology
In recent years, along with deeply carrying out of energy-saving and emission-reduction work, country is increasingly strict to the environment protection emission index request of coal-burning power plant.Clear stipulaties in up-to-date " fossil-fuel power plant atmospheric pollutant emission standard " (GB13223-2011): on January 1st, 2015, key area NOx discharge requires to be less than 100mg/m
3.
Coal-burning power plant of China in order to reach emission request, the strategy that major part takes two steps to walk: (1) carry out low NO transformation, NOx discharge is reduced to 400mg/m
3left and right; (2) between economizer exit and air preheater entrance, install SCR flue gas denitrification system additional, the NOx discharge degree of depth is reduced to 100mg/m
3below, after carrying out above-mentioned transformation, emission of NOx of boiler amount all can meet environmental protection standard, reaches Expected Results.When low NO adopts fractional combustion, hypoxemia to run, if control bad, very easily cause main combustion zone seriously oxygen debt, it not only can produce a large amount of reducibility gas CO in stove, and ash fusion point can be caused to reduce the coking of aggravation burner hearth.Furnace hopper district due to boiler is stagnation region, lacks circulation power, and the CO gas content in this region can constantly increase, and when exceeding explosion limit, after running into hot coke button or combustion disturbance, detonation just can occur and cause furnace hopper pressure jump and put out a fire; In addition, when burner hearth coking constantly increases the weight of, very easily form large coke button, when large coke button drops in slag bath, just can generate a large amount of steam and cause furnace hopper pressure increase sharply and put out a fire.In the recent period, part power plant there occurs because boiler falls the fire-putting-out emergency that burnt and furnace hopper district CO gas explosion causes boiler pressure to be uprushed causing in succession, certain power plant #7 unit Lean Coal-fired Boiler, once in one month, recurred three fire-putting-out emergencies after low NO transformation, and three accidents cause boiler pressure to be uprushed causing by furnace hopper district CO gas explosion; In addition, certain power plant #1 unit Lean Coal-fired Boiler, had once recurred twice fire-putting-out emergency after low NO transformation in one month, and incident reason is burner hearth and falls Jiao and cause furnace hopper pressure jump, causes furnace pressure to exceed protection value.Visible, boiler falls burnt and furnace hopper district CO gas explosion causes pressure jump to cause putting out a fire the major issue having become and affected boiler economics and security.
Utility model content
In order to solve the shortcoming of prior art, the utility model provides a kind of pressure control device for coal-burning boiler furnace hopper.This device is not only by air quantity at the bottom of the automatic regulating stove of the online concentration value of furnace hopper district CO gas, CO gas concentration value is controlled in safe range, preventing CO gas explosion causes furnace hopper district pressure jump to cause boiler extinguishment, but also throttle opening at the bottom of automatic regulating stove can be worth online according to furnace hopper district pressure, timely balance furnace hopper district pressure, prevent burner hearth to fall Jiao and cause furnace hopper district pressure jump to cause boiler extinguishment, greatly improve economy and the security of unit operation.
For achieving the above object, the utility model is by the following technical solutions:
For a pressure control device for coal-burning boiler furnace hopper, comprising:
Be arranged at the pressure samples pipe of furnace hopper the first half, described pressure samples pipe is connected with pressure transmitter, and pressure transmitter is connected with master controller, and described pressure transmitter for detecting the force value of furnace hopper, and is sent to master controller;
Be arranged at the gas sampling probe of furnace hopper the first half, described gas sampling probe is connected with flue gas on-line analysis instrument, flue gas on-line analysis instrument is also connected with master controller, and described flue gas on-line analysis instrument for analyzing the content value of gas in furnace hopper, and is sent to master controller;
Be arranged at the furnace bottom wind control valve of furnace hopper the latter half, described furnace bottom wind control valve is connected with master controller, and described master controller is used for adjusting the aperture of furnace bottom wind control valve in real time according to the content value of gas in the force value of furnace hopper received and furnace hopper.
Described pressure samples pipe and gas sampling probe are arranged from top to bottom successively along furnace hopper short transverse.
Described pressure samples pipe is arranged in the furnace wall width centre position of coal-burning boiler, and every face furnace wall installs a pressure samples pipe, and its one end passes in stove, and the other end is connected to pressure transmitter.
Described gas sampling probe each uniform three at left and right two face wall of coal-burning boiler, front and back two face wall respectively arranges one in width centre position, and one end of gas sampling probe passes in stove, and the other end is connected to flue gas on-line analysis instrument.
Described furnace bottom wind control valve is electric control valve, and its one end passes in stove, and the other end is direct and air is through.
Described furnace bottom wind control valve is arranged on each face wall of coal-burning boiler.
Described master controller is also connected with display module, for showing the content value of gas in the force value of the furnace hopper of acquisition and furnace hopper.
The beneficial effects of the utility model are:
(1) the utility model can realize the real-time online regulation and control of furnace hopper district CO gas concentration value, avoids CO gas explosion and causes furnace hopper district pressure jump to cause boiler extinguishment;
(2) the utility model can realize the real-time online regulation and control of furnace hopper district force value, avoids burner hearth and falls Jiao and cause furnace hopper district pressure jump to cause boiler extinguishment;
(3) the utility model can realize the automatic adjustment of furnace hopper district furnace bottom air quantity, greatly reduces the impact of furnace bottom wind on boiler economics.
Accompanying drawing explanation
Fig. 1 is the pressure control device schematic diagram for coal-burning boiler furnace hopper of the present utility model;
Fig. 2 is that furnace hopper district of the present utility model furnace bottom wind arranges schematic diagram;
Fig. 3 is that furnace hopper device for pressure measurement of the present utility model arranges schematic diagram;
Fig. 4 is that CO apparatus for measuring concentration in furnace hopper district of the present utility model arranges schematic diagram.
Wherein, 1, boiler furnace; 2, furnace hopper; 3, water sealed tank; 4, pressure samples pipe; 5, pressure transmitter; 6, gas sampling probe; 7, flue gas on-line analysis instrument; 8, furnace bottom wind control valve.
Detailed description of the invention
Below in conjunction with accompanying drawing and embodiment, the utility model is described further:
As shown in Figure 1, coal-burning boiler comprises boiler furnace 1 and furnace hopper 2, and wherein, the bottom of furnace hopper 2 is in water sealed tank 3.
Pressure control device for coal-burning boiler furnace hopper of the present utility model comprises:
Be arranged at the pressure samples pipe 4 of furnace hopper 2 the first half, pressure samples pipe 4 is connected with pressure transmitter 5, and pressure transmitter 5 is connected with master controller, and described pressure transmitter 5 for detecting the force value of furnace hopper, and is sent to master controller;
Be arranged at the gas sampling probe 6 of furnace hopper 2 the first half, gas sampling probe 6 is connected with flue gas on-line analysis instrument 7, flue gas on-line analysis instrument 7 is also connected with master controller, and flue gas on-line analysis instrument 7 for analyzing the content value of gas in furnace hopper, and is sent to master controller;
Be arranged at the furnace bottom wind control valve 8 of furnace hopper 2 the latter half, furnace bottom wind control valve 8 is connected with master controller, and described master controller is used for adjusting the aperture of furnace bottom wind control valve 8 in real time according to the content value of gas in the force value of furnace hopper received and furnace hopper.
Wherein, master controller can adopt the controller of PLC, ARM controller or 51 series.
Further, pressure samples pipe 4 and gas sampling probe 6 are arranged from top to bottom successively along furnace hopper 2 short transverse.Pressure samples pipe 4 and gas sampling probe 6 widen according to field condition with the spacing of furnace bottom wind control valve 8 as far as possible, avoid furnace bottom wind control valve 8 adjustment process to have an impact to pressure samples pipe 4 and gas sampling probe 6.
Wherein, as shown in Figure 3, pressure samples pipe 4 is the stainless steel tube of φ 10mm, and be arranged in furnace hopper 2 furnace wall width centre position, every face wall installs one, and its one end passes in stove, concordant with fin, and the other end is connected to pressure transmitter 5.
Pressure transmitter 5 is Rosemount 3051 transmitter, and accuracy class is industry 1 grade, and pressure signal is converted to 4 ~ 20mA current signal by it.The force value detecting furnace hopper is sent to master controller by pressure transmitter 5, and furnace hopper 2 observed pressure value and alarm pressure value compare by master controller in dcs, and feed back to furnace bottom wind control valve 8 to control its aperture.
As shown in Figure 4, gas sampling probe 6 is the stainless steel tube of φ 10mm, each uniform three of left and right two face wall, and front and back two face wall respectively arranges one in width centre position, and stainless steel tube one end passes in stove, and the other end is connected to flue gas on-line analysis instrument 7; Flue gas on-line analysis instrument 7 Real-Time Monitoring CO gas content, and be converted into 4 ~ 20mA signal of telecommunication; The current signal of the CO gas content that online flue gas analyzer 7 is changed is sent to master controller, and furnace hopper 2 is surveyed CO value with master controller and CO alarm pressure value compares in dcs, and feeds back to furnace bottom wind control valve 8 to control its aperture.
Furnace bottom wind control valve 8 is electric control valve, and its one end passes in stove, and the other end is direct and air is through.
Furnace bottom wind control valve 8 is arranged on each face wall of coal-burning boiler.
Master controller is also connected with display module, for showing the content value of gas in the force value of the furnace hopper 2 of acquisition and furnace hopper 2.
As shown in Figure 2, furnace bottom wind control valve 8 is the electric control valve of DN300, and its one end is connected with stainless steel short tube, and passes in stove by short tube, concordant with fin in stove, and the other end is direct and air is through; Furnace bottom wind control valve 8 arranges one for every face wall, forms circle of contact air supply mode in furnace hopper 2 district, identical with main burner circle of contact rotation direction; Furnace bottom wind control valve 8 close stance is 5% aperture, ensures that furnace bottom exists and necessarily leaks out, be beneficial to the CO concentration value and force value that control furnace hopper district.
When furnace hopper 2 district observed pressure value is less than alarm pressure value, furnace bottom wind control valve 8 maintains close stance; When observed pressure value is greater than alarm pressure value, furnace bottom wind control valve 8 is opened automatically; When furnace hopper 2 district actual measurement CO value is less than alarm pressure value, furnace bottom wind control valve 8 maintains close stance; When surveying CO value and being greater than alarm pressure value, furnace bottom wind control valve 8 is opened automatically.
The utility model is not only by air quantity at the bottom of the automatic regulating stove of the online concentration value of furnace hopper 2 district CO gas, CO gas concentration value is controlled in safe range, preventing CO gas explosion causes furnace hopper 2 district pressure jump to cause boiler extinguishment, but also wind control valve 8 aperture at the bottom of automatic regulating stove can be worth online according to furnace hopper 2 district pressure, timely balance furnace hopper 2 district pressure, prevent burner hearth 1 to fall Jiao and cause furnace hopper 2 district pressure jump to cause boiler extinguishment, greatly improve economy and the security of unit operation.Its concrete steps are:
(1) furnace hopper 2 region CO concentration alarming value and pressure alarm value is set respectively in the host controller according to the type of furnace, as-fired coal matter, operation conditions and steady combustion ability;
(2) pressure transmitter 5 measures furnace hopper 2 district force value in real time, and is sent in master controller, obtain the difference with pressure alarm value, and FEEDBACK CONTROL is to the aperture of furnace bottom wind control valve 8.When furnace hopper 2 district observed pressure value is less than alarm pressure value, furnace bottom wind control valve 8 maintains close stance; When observed pressure value is greater than alarm pressure value, furnace bottom wind control valve 8 is opened automatically.
(3) furnace hopper 2 district CO concentration value measured in real time by online flue gas analyzer 7, and is sent in master controller, obtain the difference with CO concentration alarming value, and FEEDBACK CONTROL is to the aperture of furnace bottom wind control valve 8.When furnace hopper 2 district actual measurement CO value is less than alarm pressure value, furnace bottom wind control valve 8 maintains close stance; When surveying CO value and being greater than alarm pressure value, furnace bottom wind control valve 8 is opened automatically.
By reference to the accompanying drawings detailed description of the invention of the present utility model is described although above-mentioned; but the restriction not to the utility model protection domain; one of ordinary skill in the art should be understood that; on the basis of the technical solution of the utility model, those skilled in the art do not need to pay various amendment or distortion that creative work can make still within protection domain of the present utility model.
Claims (7)
1. for a pressure control device for coal-burning boiler furnace hopper, it is characterized in that, comprising:
Be arranged at the pressure samples pipe of furnace hopper the first half, described pressure samples pipe is connected with pressure transmitter, and pressure transmitter is connected with master controller, and described pressure transmitter for detecting the force value of furnace hopper, and is sent to master controller;
Be arranged at the gas sampling probe of furnace hopper the first half, described gas sampling probe is connected with flue gas on-line analysis instrument, flue gas on-line analysis instrument is also connected with master controller, and described flue gas on-line analysis instrument for analyzing the content value of gas in furnace hopper, and is sent to master controller;
Be arranged at the furnace bottom wind control valve of furnace hopper the latter half, described furnace bottom wind control valve is connected with master controller, and described master controller is used for adjusting the aperture of furnace bottom wind control valve in real time according to the content value of gas in the force value of furnace hopper received and furnace hopper.
2. a kind of pressure control device for coal-burning boiler furnace hopper as claimed in claim 1, it is characterized in that, described pressure samples pipe and gas sampling probe are arranged from top to bottom successively along furnace hopper short transverse.
3. a kind of pressure control device for coal-burning boiler furnace hopper as claimed in claim 1, it is characterized in that, described pressure samples pipe is arranged in the furnace wall width centre position of coal-burning boiler, every face furnace wall installs a pressure samples pipe, its one end passes in stove, and the other end is connected to pressure transmitter.
4. a kind of pressure control device for coal-burning boiler furnace hopper as claimed in claim 1, it is characterized in that, described gas sampling probe each uniform three at left and right two face wall of coal-burning boiler, front and back two face walls respectively arrange one in width centre position, one end of gas sampling probe passes in stove, and the other end is connected to flue gas on-line analysis instrument.
5. a kind of pressure control device for coal-burning boiler furnace hopper as claimed in claim 1, it is characterized in that, described furnace bottom wind control valve is electric control valve, and its one end passes in stove, the other end directly and air through.
6. a kind of pressure control device for coal-burning boiler furnace hopper as claimed in claim 5, it is characterized in that, described furnace bottom wind control valve is arranged on each face wall of coal-burning boiler.
7. a kind of pressure control device for coal-burning boiler furnace hopper as claimed in claim 1, it is characterized in that, described master controller is also connected with display module, for showing the content value of gas in the force value of the furnace hopper of acquisition and furnace hopper.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520839492.3U CN205208624U (en) | 2015-10-27 | 2015-10-27 | A pressure control device for coal fired boiler furnace hopper |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520839492.3U CN205208624U (en) | 2015-10-27 | 2015-10-27 | A pressure control device for coal fired boiler furnace hopper |
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| Publication Number | Publication Date |
|---|---|
| CN205208624U true CN205208624U (en) | 2016-05-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520839492.3U Expired - Fee Related CN205208624U (en) | 2015-10-27 | 2015-10-27 | A pressure control device for coal fired boiler furnace hopper |
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| Country | Link |
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| CN (1) | CN205208624U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111637488A (en) * | 2020-05-07 | 2020-09-08 | 华电电力科学研究院有限公司 | Hydraulic deslagging type four-corner cut circular boiler coke falling monitoring and automatic stable combustion system |
-
2015
- 2015-10-27 CN CN201520839492.3U patent/CN205208624U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111637488A (en) * | 2020-05-07 | 2020-09-08 | 华电电力科学研究院有限公司 | Hydraulic deslagging type four-corner cut circular boiler coke falling monitoring and automatic stable combustion system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160504 Termination date: 20181027 |
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| CF01 | Termination of patent right due to non-payment of annual fee |