CN210021695U - High-efficient SNCR deNOx systems of circulating fluidized bed boiler - Google Patents
High-efficient SNCR deNOx systems of circulating fluidized bed boiler Download PDFInfo
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- CN210021695U CN210021695U CN201822222169.8U CN201822222169U CN210021695U CN 210021695 U CN210021695 U CN 210021695U CN 201822222169 U CN201822222169 U CN 201822222169U CN 210021695 U CN210021695 U CN 210021695U
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Abstract
The utility model provides a high-efficient SNCR deNOx systems of circulating fluidized bed boiler, including separator, overgrate air system, flue gas recirculation system, temperature measurement subassembly and logic control subassembly, the temperature measurement subassembly is used for acquireing the temperature value of separator and the temperature rise speed of separator, and logic control subassembly's signal input part, logic control subassembly control overgrate air system and flue gas recirculation system are connected to the signal output part of temperature measurement subassembly. The utility model discloses can improve reaction efficiency, reduce circulating fluidized bed boiler denitration running cost.
Description
Technical Field
The utility model belongs to the technical field of circulating fluidized bed boiler, concretely relates to high-efficient SNCR deNOx systems of circulating fluidized bed boiler.
Background
The Circulating Fluidized Bed (CFB) boiler technology is a high-efficiency low-pollution clean coal power generation technology which is rapidly developed in recent ten years, NOx in flue gas is removed by the CFB boiler generally in an SNCR mode, and the reaction temperature window is 850-1050 ℃. In recent years, the power demand is increased and slowed, more and more units need peak shaving operation, and under the condition of low load of a large number of CFB boilers, according to the conventional control logic, the inlet temperature of a separator is lower than 850 ℃, so that the SNCR reaction efficiency is low or even cannot be carried out, and a large amount of reducing agent needs to be consumed.
In the existing boiler NOx control system, the final NOx emission is controlled by correcting the consumption of a reducing agent according to boiler load and actual NOx emission, which is a passive correction method, the NOx emission can be controlled, and the denitration reaction efficiency is not improved from the root, so that the denitration cost is increased.
In conclusion, the SNCR denitration reaction efficiency in the prior art is low, so that the denitration cost is high.
SUMMERY OF THE UTILITY MODEL
To the problem among the prior art, the utility model provides a high-efficient SNCR deNOx systems of circulating fluidized bed boiler, its aim at improves SNCR denitration reaction efficiency, reduces circulating fluidized bed boiler denitration running cost.
In order to solve the technical problem, the utility model discloses a following scheme realizes:
the utility model provides a high-efficient SNCR deNOx systems of circulating fluidized bed boiler, includes furnace, separator, overgrate air system, flue gas recirculation system and temperature measurement subassembly, furnace and separator intercommunication, flue gas recirculation system and furnace intercommunication, overgrate air system and furnace intercommunication, temperature measurement subassembly sets up the inner wall at the separator, and temperature measurement subassembly is used for acquireing the temperature value of separator and the temperature rise speed of separator, and the display screen is connected to the temperature measurement subassembly output, through the temperature of display screen display separator.
And the signal output end of the temperature measuring assembly is connected with the signal input end of the logic control assembly, and the logic control assembly controls the secondary air system and the flue gas recirculation system.
Further, the logic control assembly is used for sending an output increasing instruction to the secondary air system and sending an output reducing instruction to the flue gas recirculation system when detecting that the temperature value of the separator is greater than the preset temperature window upper limit or the temperature rise rate of the separator is greater than the preset temperature rise rate; when the temperature value of the separator is detected to be smaller than the preset temperature window lower limit or the temperature drop rate of the separator is detected to be larger than the preset temperature drop rate, sending a reducing instruction to a secondary air system and sending an output increasing instruction to a flue gas recirculation system; and when the detected temperature value of the separator is within a preset temperature window range or the temperature rise rate of the separator is within a preset temperature rise rate range, sending a normal instruction to the secondary air system, and sending a normal output instruction to the flue gas recirculation system.
Further, the device also comprises a primary air system and a chimney, wherein the primary air system is communicated with the hearth, and the separator is communicated with the chimney.
Further, an induced draft fan is arranged between the separator and the chimney, and the induced draft fan discharges the generated flue gas into the chimney after passing through the separator.
Furthermore, an SNCR spray gun is arranged on the separator, and the SNCR spray gun sprays the reducing agent into the separator to perform reaction denitration.
Furthermore, the logic control assembly is system hardware and software for controlling the operation of the boiler body and the auxiliary machine.
Compared with the prior art, the utility model discloses following beneficial effect has at least: the utility model discloses utilize the temperature value that the temperature measurement subassembly detected the separator, calculate the temperature rise rate of separator, then show separator temperature value and temperature rise rate through the display screen, thus, operating personnel can audio-visually read out the temperature value of separator and the temperature rise rate of separator through the digital display of display screen, then, operating personnel can be real-time with the display screen gained value and the default judges and select corresponding operation, when the separator temperature value that the display screen shows is greater than the default height, or when the temperature rise rate of separator is greater than the default temperature rise rate, operating personnel is through the operation to overgrate air system and flue gas recirculation system, make the temperature of separator reduce to the default within range; when the temperature value of the separator displayed by the display screen is smaller than the preset value lower limit or the temperature rise rate of the separator is larger than the preset temperature drop rate, an operator reduces the temperature of the separator to be within the preset value range through operating the secondary air system and the flue gas recirculation system; when the temperature value of the separator displayed by the display screen is within the preset value range or the temperature rise rate of the separator is within the preset temperature rise rate range, an operator does not process the temperature value, and the temperature of the separator is maintained within the preset value range. Through such design, operating personnel can be real-time initiative control NOx final emission, improves denitration reaction efficiency, reduces the denitration cost.
Further, the utility model discloses the signal input part of logic control subassembly, logic control subassembly control overgrate air system and flue gas recirculation system are connected to temperature measurement subassembly's signal output part. Detecting the temperature value of the separator by using a temperature measuring assembly, and calculating the temperature rise rate of the separator; then comparing the detected temperature value of the separator with a preset temperature window value, and comparing the temperature rise rate of the separator with a preset temperature rise rate; when the detected temperature value of the separator is larger than the preset temperature window high limit value or the temperature rise rate of the separator is larger than the preset temperature rise rate, the logic control assembly generates a separator temperature high signal or a separator temperature rise rate high signal, sends an output increasing instruction to the secondary air system and sends an output reducing instruction to the flue gas recirculation system, and the temperature of the separator is reduced to be within the preset temperature window value range; when the detected temperature value of the separator is smaller than the preset temperature window low limit value or the temperature rise rate of the separator is larger than the preset temperature drop rate, the logic control assembly generates a separator temperature low signal or a separator temperature drop rate high signal, sends a reduction instruction to the secondary air system and sends an output increase instruction to the flue gas recirculation system, and the temperature of the separator is increased to be within the preset temperature window value range; when the detected temperature value of the separator is within the range of the preset temperature window value or the temperature rise rate of the separator is within the range of the preset temperature rise rate, the logic control assembly generates a normal temperature signal of the separator or a normal temperature drop rate signal of the separator, sends a normal instruction to the secondary air system and sends a normal output instruction to the flue gas recirculation system, and the temperature of the separator is maintained within the range of the preset temperature window value. Namely, the utility model provides an active high-efficient SNCR denitration method through acquireing separator temperature value and separator temperature change rate, carries out the comparison and then automatic trigger control logic carries out the denitration optimization with the default. Therefore, when the temperature of the reactor deviates from a temperature window to cause the consumption of the reducing agent to increase or the reaction to stop, the reaction efficiency is improved, and the denitration operation cost of the circulating fluidized bed boiler is reduced.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are 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 view of a circulating fluidized bed boiler according to an embodiment of the present invention;
FIG. 2 is a schematic control flow chart of the present invention;
FIG. 3 is a schematic diagram of the logic control of the S3 logic control assembly of FIG. 2;
FIG. 4 is a schematic diagram of the logic control of the S4 logic control assembly of FIG. 2;
FIG. 5 is a schematic diagram of the logic control of the S5 logic control assembly of FIG. 2;
fig. 6 is a schematic view of the control system of the present invention.
Icon: 10-a hearth; 110-a separator; 120-secondary air system; 130-flue gas recirculation system; 140-a draught fan; 150-primary air system; 160-SNCR spray gun; 170-chimney.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
As shown in fig. 1, the circulating fluidized bed boiler includes a furnace 10, a separator 110, a secondary air system 120, a flue gas recirculation system 130, an induced draft fan 140, a primary air system 150, an SNCR spray gun 160, a chimney 170, a temperature control assembly and a logic control assembly, wherein the primary air system 150 and the secondary air system 120 are both communicated with the furnace 10, the furnace 10 is communicated with the separator 110, the separator 110 is communicated with the chimney 170, the induced draft fan 140 is arranged between the separator 110 and the chimney 170, the SNCR spray gun 160 is arranged on the separator 110, the temperature measurement assembly is arranged on the inner wall of the separator 110, an output end of the temperature measurement assembly is connected with a display screen, and the temperature of the separator 110 is displayed through the display screen. Through the display screen, operating personnel can audio-visually read out the temperature value of separator and the temperature rise rate of separator through the digital display of display screen. The primary air system 150 and the secondary air system 120 send air into the hearth 10 to support combustion, the generated flue gas passes through the separator 110 and is discharged into the chimney 170 through the induced draft fan 140, the SNCR spray gun sprays the reducing agent into the separator 110 to perform reaction denitration, and the flue gas recirculation 130 sends part of the flue gas back to the hearth 10.
As a preferred embodiment of the present invention, as shown in fig. 6, the temperature measuring assembly is used for obtaining the temperature value of the separator 110 and the temperature rise rate of the separator 110, the signal output end of the temperature measuring assembly is connected to the signal input end of the logic control assembly, and the logic control assembly controls the secondary air system 120 and the flue gas recirculation system 130.
As shown in fig. 2, as a preferred embodiment of the present invention, the logic control module, i.e. the system hardware and software for controlling the operation of the boiler body and the auxiliary machine, sends an increased output instruction to the secondary air system 120 and a decreased output instruction to the flue gas recirculation system 130 when detecting that the temperature value of the separator 110 is greater than the preset temperature window height or the temperature rise rate of the separator 110 is greater than the preset temperature rise rate; when the temperature value of the separator 110 is detected to be smaller than the preset temperature window lower limit or the temperature drop rate of the separator 110 is detected to be larger than the preset temperature drop rate, a reducing instruction is sent to the secondary air system 120, and an output increasing instruction is sent to the flue gas recirculation system 130; when the detected temperature value of the separator 110 is within the preset temperature window range or the temperature rise rate of the separator 110 is within the preset temperature rise rate range, a normal instruction is sent to the secondary air system 120, and a normal output instruction is sent to the flue gas recirculation system 130.
Through a large amount of research and practice of the utility model, when the circulating fluidized bed boiler works, the output of the secondary air system 120 and the output of the flue gas recirculation system 130 can be adjusted to control the temperature of the separator 110 connected with the hearth 10, so that the reaction efficiency of the reducing agent sprayed by the SNCR spray gun 160 and NOx in the flue gas is improved. For example, as the temperature of the separator 110 decreases, the SNCR reaction efficiency decreases, increasing the temperature of the separator 110 by decreasing the output of the secondary air system 120, or increasing the output of the flue gas recirculation system 130.
Therefore, in the present embodiment, the temperature and the rising and falling rates of the separator 110 are detected as a judgment basis to perform the denitration control with high efficiency. The embodiment provides a high-efficiency SNCR denitration system for detecting the temperature of the separator 110, and controlling the working states of the secondary air system 120 and the flue gas recirculation system 130 according to the detection result, so as to achieve the effect of improving the denitration efficiency.
As shown in FIG. 2, the utility model discloses a method for using high-efficient SNCR deNOx systems of circulating fluidized bed boiler, including following step:
s1, the temperature measuring component detects the temperature value of the separator 110, calculates the temperature rise rate of the separator 110, as a preferred embodiment of the utility model, the temperature measuring component comprises a separator temperature high detecting unit for detecting the temperature value, a separator temperature low detecting unit for detecting the temperature value, and a separator temperature normal detecting unit for detecting the separator temperature value; the temperature measuring assembly detects any one temperature value of the horizontal flue at the inlet of the separator 110, the horizontal flue at the outlet of the separator 110 and the body of the separator 110, wherein the temperature detecting units at the inlet, the outlet and the body of the separator 110 simultaneously comprise a plurality of sampling points;
s2, comparing the detected temperature value of the separator 110 with a preset temperature window, wherein the preset temperature window refers to the optimum temperature interval of the SNCR reaction determined by a combustion adjustment test, and comparing the temperature rise rate of the separator 110 with the preset temperature rise rate;
when the detected temperature value of the separator 110 is greater than the preset temperature window upper limit, or the temperature rise rate of the separator 110 is greater than the preset temperature rise rate, performing S3;
when the detected temperature value of the separator 110 is smaller than the preset temperature window lower limit, or the temperature rise rate of the separator 110 is larger than the preset temperature drop rate, executing S4;
when the detected temperature value of the separator 110 is within the preset temperature window range or the temperature rise rate of the separator 110 is within the preset temperature rise rate range, performing S5;
s3, the logic control component generates a high temperature signal of the separator 110 or a high temperature rise rate signal of the separator 110, sends an output increasing instruction to the secondary air system 110, increases the power of the secondary air system 120, sends an output decreasing instruction to the flue gas recirculation system 110, and closes the throttle of the flue gas recirculation system 130;
s4, the logic control assembly generates a low temperature signal of the separator 110 or a high temperature drop rate signal of the separator 110, sends a reduction instruction to the secondary air system 120, turns off the power of the secondary air system 120, sends an output increase instruction to the flue gas recirculation system 130, and opens a throttle of the flue gas recirculation system 130;
and S5, the logic control component generates a normal temperature signal of the separator 110 or a normal temperature drop rate signal of the separator 110, sends a normal instruction to the secondary air system 120 and sends a normal output instruction to the flue gas recirculation system 130.
In this embodiment, the logic control module performs judgment control for efficient denitration based on the data obtained by the temperature detection module.
As shown in fig. 3, 4 and 5, the logic control component obtains the temperature value of the separator 110, and when it is detected that the temperature of the separator 110 is greater than the upper limit of the preset separator temperature window, or the temperature rise rate of the separator 110 is greater than the preset separator temperature rise rate, delays for 3s, sends an instruction to start the secondary air system, and sends an instruction to close the flue gas recirculation system. Wherein, as a certain preferred embodiment of the utility model, predetermine the separation temperature window upper limit and can set up to 900 ℃, predetermine the separator temperature rise rate and can set up to 1 ℃/s.
To sum up, the utility model provides a high-efficient denitration method and system through the temperature value that acquires separator 110 and separator 110's temperature change rate, compares and then automatic trigger control logic carries out the denitration optimization with the default. Therefore, when the temperature of the reactor deviates from a temperature window to cause the consumption of the reducing agent to increase or the reaction to stop, the reaction efficiency is improved, and the denitration operation cost of the circulating fluidized bed boiler is reduced.
Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present invention, and are not intended to limit the technical solution of the present invention, and the protection scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: those skilled in the art can still modify or easily conceive of changes in the technical solutions described in the foregoing embodiments or make equivalent substitutions for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (4)
1. The utility model provides a high-efficient SNCR deNOx systems of circulating fluidized bed boiler which characterized in that: the system comprises a hearth (10), a separator (110), a secondary air system (120), a flue gas recirculation system (130) and a temperature measurement component, wherein the hearth (10) is communicated with the separator (110), the flue gas recirculation system (130) is communicated with the hearth (10), the secondary air system (120) is communicated with the hearth (10), the temperature measurement component is arranged on the inner wall of the separator (110), the temperature measurement component is used for acquiring the temperature value of the separator (110) and the temperature rise rate of the separator (110), the output end of the temperature measurement component is connected with a display screen, and the temperature of the separator (110) is displayed through the display screen;
the SNCR denitration system further comprises a primary air system (150) and a chimney (170), wherein the primary air system (150) is communicated with the hearth (10), and the separator (110) is communicated with the chimney (170);
an induced draft fan (140) is arranged between the separator (110) and the chimney (170), and the induced draft fan (140) discharges the generated flue gas into the chimney (170) after passing through the separator (110).
2. The efficient SNCR denitration system of the circulating fluidized bed boiler according to claim 1, characterized in that: the secondary air temperature measurement device further comprises a logic control assembly, wherein the signal output end of the temperature measurement assembly is connected with the signal input end of the logic control assembly, and the logic control assembly controls the secondary air system (120) and the flue gas recirculation system (130).
3. The efficient SNCR denitration system of the circulating fluidized bed boiler according to claim 1, characterized in that: an SNCR spray gun (160) is arranged on the separator (110), and the SNCR spray gun (160) sprays a reducing agent into the separator (110) to perform reaction denitration.
4. The SNCR denitration system of claim 2, wherein: and the logic control assembly is system hardware and software for controlling the operation of the boiler body and the auxiliary machine.
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| CN111389214A (en) * | 2020-03-30 | 2020-07-10 | 神华神东电力有限责任公司 | Feeding control method and device for in-furnace desulfurization and material feeding system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111389214A (en) * | 2020-03-30 | 2020-07-10 | 神华神东电力有限责任公司 | Feeding control method and device for in-furnace desulfurization and material feeding system |
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