CN206890567U

CN206890567U - A kind of coal-fired boiler combustion monitoring system based on CO detections

Info

Publication number: CN206890567U
Application number: CN201720034253.XU
Authority: CN
Inventors: 向先好; 艾俊清; 朱志涛
Original assignee: Wuhan Hengtai Sichuang Electric Power Technology Co Ltd
Current assignee: Wuhan Hengtai Sichuang Electric Power Technology Co Ltd
Priority date: 2017-01-12
Filing date: 2017-01-12
Publication date: 2018-01-16
Anticipated expiration: 2027-01-12

Abstract

The utility model discloses a kind of coal-fired boiler combustion monitoring system based on CO detections, the monitoring system includes multiple burners, multiple thief holes, multiple CO detection means, the probe tube of the first CO detection means is located in described burner hearth by the first described monitoring thief hole, the back-end ductwork includes economizer, multiple second monitoring thief holes, multiple 2nd CO sensors, air preheater, and the 2nd CO sensors are located between the economizer and the air preheater.Coal-fired boiler combustion monitoring system described in the utility model is provided with CO detection means, the distribution situation of CO in stove can be monitored, realize the dynamic monitoring of furnace air temperature field, pass through the adjustment of the air distribution to boiler-burner, the related operational factor of boiler is adjusted, the flue gas atmosphere in stove and its reasonability of distribution is controlled, controls the generation of combustion process pollutant, the efficiency of combustion of boiler is improved, so as to ensure the economy of boiler combustion process and reliability.

Description

A kind of coal-fired boiler combustion monitoring system based on CO detections

Technical field

A kind of boiler combustion monitoring system is the utility model is related to, more particularly to a kind of coal-burning boiler based on CO detections Combustion Supervisory Control System.

Background technology

The combustion position of coal-fired power station boiler is largely fixed and affected boiler plant and whole generating set Economy and security.

Fuel combustion is abundant, fire box temperature field and heat load distribution are uniform, is to improve boiler combustion efficiency, ensure boiler peace Entirely, stably, low stain, the premise of economical operation, but in boiler actual moving process, due to the change of load and ature of coal, Once boiler combustion adjustment is bad, deflection, coking and slagging and high temperature corrosion, the combustion process life at furnace flame center just occurs Into NOx concentration it is big, furnace outlet gas temperature deviation is big influences unit fortune with high temperature superheater and high temperature reheater overtemperature of tube wall etc. The problem of row.In general boiler combustion adjustment controls combustion atmospheres and the temperature field in stove by air distribution and oxygen amount adjustment, Guarantee efficiency of combustion, the aflame major pollutants NOx concentration of control, but this oxygen amount based in furnace outlet and flue The major defect of method of adjustment is to measure oxygen amount can not directly reflect the quality of furnace air and coal dust troubled water, is only capable of providing Excess air coefficient, simultaneously because boiler tail heavy in section flue gas is layered, i.e., flue gas often mixes very uneven, with the time It is big with load fluctuation, plus leaking out for flue, oxygen content measurement it is representative bad.

Past attempts use the CO in flue gas₂As firing optimization foundation, but CO₂The composition of content and fuel has very big pass System.

Disclosed patent proposes a kind of power boiler burning method of adjustment based on infra red radiation energy signal, passes through The radiant energy intensity information in stove is obtained with infrared energy sensor, optimizes to obtain radiation energy deviation using artificial neural network Value, finally by access boiler DCS fuel control modules, to change the method to coal control logic to realize.Due in stove Combustion process is a unsteady state, and obtaining infrared energy information in stove by sensor fluctuates very big, radiation energy deviation Value is uncertain, also just can not carry out firing optimization, thus this burning tune by DCS come adjust automatically fuel in time, accurately Adjusting method just could not popularization and application in practice.

Utility model content

The purpose of this utility model is to overcome the shortcomings of above-mentioned background technology, there is provided a kind of fire coal based on CO detections Boiler combustion monitoring system, it is repeatedly adjusted the operational factor of boiler, improve the efficiency of combustion of boiler, it is ensured that boiler combustion Security and low stain.

A kind of boiler new combustion monitoring system based on CO detections provided by the utility model, it includes burner hearth, level Flue and back-end ductwork；The burner hearth, the horizontal flue and the back-end ductwork are sequentially connected in " Π " font, the burner hearth Including ash outlet, multiple burners, multiple first monitoring thief holes, multiple first CO detection means, above the burner Nearby it is provided with multiple the first described monitoring thief holes；The back-end ductwork includes economizer, multiple second monitoring thief holes, more Individual 2nd CO sensors, air preheater, front and rear wall or two side of the second monitoring thief hole located at the back-end ductwork, The 2nd CO sensors are located in described back-end ductwork by the second described monitoring thief hole, and the 2nd CO Sensor is located between the economizer and the air preheater.

Beneficial effect：Coal-fired boiler combustion monitoring system described in the utility model based on CO detections is provided with CO detection dresses Put, the distribution situation of CO in stove can be monitored, realize the dynamic monitoring in furnace air temperature field, by matching somebody with somebody to boiler-burner The adjustment of wind, the operational factor of boiler is repeatedly adjusted, control reducing atmosphere and its uniformity in stove, can effectively reduce water cooling The high temperature corrosion and slagging of wall, the generation of pollutant in combustion process is controlled, the efficiency of combustion of boiler is improved, so as to ensure boiler The economy and reliability of combustion process.

Brief description of the drawings

Below in conjunction with drawings and Examples, the utility model is described in further detail, in accompanying drawing：

Fig. 1 is a kind of arrangement signal of coal-fired boiler combustion monitoring system based on CO detections provided by the utility model Figure；

Fig. 2 is that a kind of coal-fired boiler combustion monitoring system based on CO detections provided by the utility model is arranged in schematic diagram AA1 sectional view；

Fig. 3 is that a kind of coal-fired boiler combustion monitoring system based on CO detections provided by the utility model is arranged in schematic diagram BB1 sectional view.

Embodiment

Below in conjunction with the accompanying drawings and embodiment is described in further detail to the utility model, but the embodiment should not be understood For to limitation of the present utility model.

As shown in figure 1, a kind of coal-fired boiler combustion monitoring system based on CO detections provided by the utility model, it includes Burner hearth 1, horizontal flue 2 and back-end ductwork 3；The burner hearth 1, the horizontal flue 2 and the back-end ductwork 3 are in " Π " font It is sequentially connected.

Taken as shown in figure 1, described burner hearth 1 includes ash outlet 11, multiple burners 12, multiple first monitoring thief holes Sample 13, the ash outlet 11 be located at the bottom of the burner hearth 1, the burner hearth 1 is provided with multiple described burners 12, described Burner 12 is above nearby provided with multiple the first described monitoring thief holes 13, and specifically, the first monitoring thief hole 13 is Carbofrax material, as shown in Fig. 2 specifically, the same plane of the burner hearth 1 is uniformly provided with the first CO detection dresses described in 8 sets 14 are put, top and the hearth wall distance of the first CO detection means 14 are 30mm, can be detected near the burner 12 CO concentration, the smoke folded angle 15 can make the cigarette in burner hearth located at the junction of the burner hearth 1 and the horizontal flue 2 Gas heat use is more abundant.

As shown in figure 1, the left end of described horizontal flue 2 connects with the plan vertical of the burner hearth 1, described horizontal cigarette The left end in road 2 is provided with heating surface 21, and the right-hand member of the horizontal flue 2 is connected with the top of back-end ductwork 3.

Passed as shown in figure 1, the back-end ductwork 3 includes economizer 31, multiple second monitoring thief holes 32, multiple 2nd CO Sensor 33, air preheater 34, as shown in figure 3, the second monitoring thief hole 32 is located at the front and rear wall of the back-end ductwork 3 Or two side, specifically, the 3 conplane front and rear wall of back-end ductwork or two side are respectively equipped with the 2nd CO described in 2 Sensor 33, it is preferable that the second monitoring thief hole 33 is carbofrax material, and the 2nd CO sensors 33 are by described Second monitoring thief hole 32 is located in described back-end ductwork 3, and the 2nd CO sensors 33 are located at the economizer Between 31 and the air preheater 34.

As described in Figure 1, the hot-air that coal dust and the air preheater come is by described burner 12 described Burnt in burner hearth 1, ashes are dropped from described ash outlet 11, and the first described CO is provided near the burner 12 and is detected CO concentration in device monitoring flue gas, the concentration of CO in flue gas is kept in the range of setting；Flue gas up enters described water Flat pipeline 2, the described smoke folded angle 15 on described the right of burner hearth 1 imports partial fume described heating surface 21, afterwards by institute The economizer 31 stated cools, and CO concentration, keeps the concentration of CO in flue gas setting in the 2nd CO sensors 33 monitoring flue gas In the range of fixed value, flue gas is by described air preheater, to the air preheat in described air preheater, then from institute The outlet for the back-end ductwork 3 stated enters next workspace.

Coal-fired boiler combustion monitoring system described in the utility model based on CO detections is provided with CO detection means, can monitor CO distribution situation in stove, realizes the dynamic monitoring in furnace air temperature field, more by the adjustment of the air distribution to boiler-burner The operational factor of secondary adjustment boiler, controls the atmosphere and its uniformity in stove, can effectively reduce high temperature corrosion and the knot of water-cooling wall Slag, the generation of pollutant in combustion process is controlled, the efficiency of combustion of boiler is improved, so as to ensure the economy of boiler combustion process And reliability.

Obviously, those skilled in the art can carry out various changes and modification without departing from this practicality to the utility model New spirit and scope.So, if these modifications and variations of the present utility model belong to the utility model claims and Within the scope of its equivalent technologies, then the utility model is also intended to comprising including these changes and modification.

Claims

A kind of 1. coal-fired boiler combustion monitoring system based on CO detections, it is characterised in that：It includes burner hearth, horizontal flue and tail Portion's flue；The burner hearth, the horizontal flue and the back-end ductwork are sequentially connected in " Π " font, and the burner hearth includes ashes Outlet, multiple burners, multiple first monitor thief hole, multiple first CO detection means, are nearby provided with above the burner Multiple the first described monitoring thief holes；The back-end ductwork includes economizer, multiple second monitoring thief holes, multiple 2nd CO Sensor, air preheater, front and rear wall or two side of the second monitoring thief hole located at the back-end ductwork, described second CO sensors are located in described back-end ductwork by the second described monitoring thief hole, and the 2nd CO sensors are set Between the economizer and the air preheater.
A kind of 2. coal-fired boiler combustion monitoring system based on CO detections as claimed in claim 1, it is characterised in that：Described One monitoring thief hole and the second monitoring thief hole are carbofrax material.
A kind of 3. coal-fired boiler combustion monitoring system based on CO detections as claimed in claim 1, it is characterised in that：The combustion Burner is nearby provided with multiple CO monitoring thief holes.
A kind of 4. coal-fired boiler combustion monitoring system based on CO detections as claimed in claim 1, it is characterised in that：The stove The same plane of thorax is uniformly provided with 4-8 described CO detection means, the top of the first CO monitorings thief hole and hearth wall Distance is 30mm-50mm.