CN216977554U - Incineration type flue gas purification system - Google Patents
Incineration type flue gas purification system Download PDFInfo
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- CN216977554U CN216977554U CN202121426582.1U CN202121426582U CN216977554U CN 216977554 U CN216977554 U CN 216977554U CN 202121426582 U CN202121426582 U CN 202121426582U CN 216977554 U CN216977554 U CN 216977554U
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Abstract
The utility model discloses an incineration type flue gas purification system. The incineration type flue gas purification system comprises a dust removal device, a denitration device and an emptying pipe which are sequentially communicated through a flue gas pipeline; the incinerator is communicated with the front part of the emptying pipe through the flue gas pipeline; the incineration device is used for removing pollutants in the flue gas to be treated by incinerating combustible components of the flue gas to be treated. Thus, combustible components in the flue gas to be treated can be utilized, and the energy consumption for purifying the flue gas can be greatly reduced. In the process of burning the flue gas, carbon monoxide, VOCs and dioxin can be converted into carbon dioxide or water and other non-pollutants, pollutants in the flue gas to be treated are removed, the pollutants are prevented or reduced from entering absorption slurry such as desulfurization and the like, the subsequent treatment process of the slurry is omitted, and the flue gas purification treatment cost is reduced.
Description
Technical Field
The utility model relates to a flue gas purification technology, in particular to an incineration type flue gas purification system.
Background
The flue gas discharged from combustion furnaces (sintering furnaces, shaft furnaces, rotary kilns and blast furnaces) comprises dust and NOXSOx, CO, VOCs, dioxins, etc. In order to reduce harmful pollutants in flue gases, it is often necessary to purify the flue gases.
The flue gas purification process generally comprises dust removal, desulfurization, denitration and then emptying, so that the nitrate and the sulfur can be removed before emptying, and the flue gas is purified. Among them, Volatile Organic Compounds (VOCs) and dioxins often enter the absorption slurry during the desulfurization and denitration processes to become components of the absorption slurry, and harmful substances formed by the VOCs and dioxins are left in the filter cake during the filtration treatment of the absorption slurry, which causes the filter cake to be difficult to treat, and further becomes an important obstacle for the utilization of the filter cake. In the prior art, either special treatment is carried out on the absorption slurry or special treatment is carried out on the filter cake, and the treatment causes complex process and high cost.
In addition, after dust removal is carried out according to the existing flue gas treatment process, because the flue gas temperature is lower, denitration treatment is not facilitated, a special heating or warming means is required to be arranged to increase the flue gas temperature entering the denitration device, and the energy consumption for flue gas treatment is higher.
How to further improve the flue gas purification effect, reduce the adverse effect of harmful pollutants, reduce the flue gas purification treatment cost, and reduce the flue gas purification energy consumption is a technical problem that needs to be solved by technical personnel in the field at present.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide an incineration type flue gas purification system which can better purify flue gas and avoid or reduce the defects of complex process and high treatment cost caused by the existence of VOCs and dioxin.
The incineration type flue gas purification system provided by the utility model comprises a dust removal device, a denitration device and an emptying pipe which are sequentially communicated through a flue gas pipeline; the incinerator is communicated with the front part of the emptying pipe through the flue gas pipeline; the incineration device is used for removing pollutants such as VOCs, dioxin and the like in the flue gas to be treated by incinerating combustible components of the flue gas to be treated. Combustible components in the flue gas to be treated can be utilized to purify the pollutants in the flue gas, so that the addition of external fuel can be reduced, and the energy consumption of flue gas purification can be greatly reduced. Pollutants such as VOCs, dioxin and the like in the flue gas to be treated can be removed in the flue gas burning process, the situation that the VOCs and the dioxin enter other devices and then enter slurry or other substances is avoided or reduced, the subsequent treatment process of the slurry is omitted, and the flue gas purification treatment cost is reduced.
In the preferred technical scheme, the incineration device is communicated between the dust removal device and the denitration device through the flue gas pipeline. When the denitration device carries out denitration treatment, the flue gas to be treated needs to be heated to a certain temperature, and the temperature of the flue gas discharged from the combustion furnace after dust removal treatment is lower than the temperature required by denitration. After getting rid of VOCs and dioxin through the incineration device, the flue gas temperature of treating improves, can provide good condition for denitration treatment, can reduce the energy consumption of heating the flue gas before the denitration, and then reduce cost, incineration disposal promptly can realize denitration function and effect of preheating.
In a further preferred technical scheme, the device also comprises a preheating heat exchanger; the preheating heat exchanger comprises a first passage and a second passage for heat exchange; the smoke inlet of the first passage is communicated with the smoke outlet of the dust removal device through a smoke pipeline, and the smoke outlet is communicated with the smoke inlet of the incineration device through a smoke pipeline; the smoke inlet of the second passage is communicated with the smoke outlet of the denitration device through a smoke pipeline, and the smoke outlet is communicated with the emptying pipe through a smoke pipeline. Through preheating the heat exchanger, can utilize heat to preheat the flue gas that gets into the incineration device in the denitration treatment back flue gas, make full use of system's heat reduces or reduces the incineration device and consumes, improves the whole efficiency of system.
In a further technical scheme, the incineration type flue gas purification system also comprises a desulfurization device, wherein the desulfurization device is communicated between a smoke outlet of the denitration device and the emptying pipe through a flue gas pipeline;
still include the white heat exchanger that disappears: the white elimination heat exchanger comprises a white elimination gas channel and a white elimination gas channel which are used for heat exchange; the smoke inlet of the white smoke eliminating channel is communicated with the smoke outlet of the dust removing device through a smoke pipeline, and the smoke outlet is communicated with the smoke inlet of the desulfurizing device through a smoke pipeline; the inlet of the white eliminating gas passage is communicated with the outlet of the white eliminating fan through a flue gas pipeline so as to introduce white eliminating gas, and the outlet is communicated with the emptying pipe through the flue gas pipeline. The white gas eliminating heat exchanger can preheat white gas by utilizing heat in flue gas after denitration treatment, the preheated white gas is mixed with air to be exhausted, the temperature of the exhausted flue gas can be increased, the humidity of the flue gas is reduced, the white smoke phenomenon of the exhausted flue gas is reduced or eliminated, and the corrosion of the exhausted flue gas on an exhaust pipe is reduced.
In a preferred technical scheme, the incineration device comprises a plurality of incinerators; each incinerator comprises an incineration chamber, a smoke inlet branch pipe and a smoke outlet branch pipe which are communicated with the incineration chamber; the smoke inlet branch pipes of the plurality of incinerators are communicated with the smoke inlet of the incinerating device; the smoke outlet branch pipes of the plurality of incinerators are communicated with the smoke outlet of the incinerating device. Therefore, each incinerator can work intermittently, the temperature of each incinerator is kept in a proper range, the incinerator is prevented from being overheated, and the reliability and the service life of the incineration device are improved.
In a further preferred technical scheme, an ignition device is arranged corresponding to each incineration chamber; the incineration device comprises an incineration controller which is in signal connection with a plurality of ignition devices. This allows for automatic control of multiple incinerators.
In a preferable technical scheme, in the incineration device, the upper parts of the plurality of energy storage oxidation furnaces are communicated with an incinerator, and the incinerator is provided with a fuel inlet.
In a further optional technical scheme, a heat insulation structure is arranged among the plurality of oxidation chambers.
In an optional technical scheme, an emptying dust remover is arranged in the emptying pipe and is positioned between an outlet of the white-removing gas passage and a communication position of the emptying pipe.
In an optional technical scheme, a demister is further arranged in the emptying pipe and is positioned in front of the emptying dust remover.
The incineration type flue gas purification method provided by the utility model comprises the steps of treating flue gas to be treated through a dust removal step and a denitration step, then emptying, and further comprising an incineration step before emptying; in the burning step, pollutants such as VOCs, dioxin and the like in the flue gas are removed by burning combustible components of the flue gas to be treated. Corresponding to the incineration type flue gas purification system, the incineration type flue gas purification method can convert VOCs and dioxin into carbon dioxide or water, avoids or reduces the situation that the VOCs and the dioxin enter other devices and then enter absorption slurry or other substances, saves subsequent treatment processes, and reduces the flue gas purification treatment cost.
In a preferred technical scheme, the incineration step is before the denitration step; through the incineration step, after the temperature of the flue gas to be purified is raised to the denitration temperature, the denitration preparation temperature is between 250 and 450 ℃. When getting rid of carbon monoxide, VOCs and dioxin through burning device, can improve pending gas temperature to between 250 degrees to 450 degrees, for denitration treatment provides suitable temperature condition, can save the process and the step of heating the flue gas between the denitration, and then reduce the energy consumption, simplify the processing procedure, reduce the gas cleaning cost.
In the preferred technical scheme, the flue gas to be treated in the burning step is heated by utilizing the flue gas treated in the denitration step. The flue gas entering the burning step can be preheated by utilizing the heat in the flue gas after denitration treatment, the heat of the system is fully utilized, the consumption of the burning step is reduced, and the overall efficiency of the system is improved.
In the preferred technical scheme, the method also comprises a desulfurization step after the denitration step and before the evacuation step; carrying out desulfurization treatment on the flue gas subjected to denitration treatment through the desulfurization step; further comprising: and heating preset white eliminating gas by using the flue gas treated in the denitration step and between the desulfurization steps, and mixing the heated white eliminating gas with the flue gas in the desulfurization step. Therefore, the heat in the flue gas after denitration treatment can be used for preheating the white exhaust gas, and the preheated white exhaust gas is mixed with the air to be exhausted, so that the temperature of the air to be exhausted can be increased, the white smoke phenomenon of the exhausted flue gas is reduced, and the corrosion of the exhausted flue gas on an exhaust pipe is reduced.
Drawings
FIG. 1 is a schematic structural diagram of an incineration flue gas purification system of an embodiment of the utility model;
FIG. 2 is a flow chart of an embodiment of the incineration flue gas purification method of the utility model.
Detailed Description
The following describes embodiments of an incineration flue gas purification system and an incineration flue gas purification method provided by the present invention with reference to the accompanying drawings. In this document, the meanings of the terms such as "front" and "rear" are determined by considering the implementation states and the process sequences of the incineration flue gas purification system and the incineration flue gas purification method, and should not be construed as limiting the patent in any way.
Referring to fig. 1, it is a schematic structural diagram of an incineration type flue gas purification system according to an embodiment of the present invention. The incineration type flue gas purification system comprises a dust removal device 100, an incineration device 400, a denitration device 200 and an emptying pipe 300 which are sequentially communicated through a flue gas pipeline.
Wherein, the dust removing device 100 can select the existing dust removing equipment or perform the dust removing treatment on the flue gas to be treated by utilizing the existing dust removing mode. In one embodiment, the dust removing device 100 may include a cyclone dust collector and a pulse bag dust collector. Of course, a plurality of dust collectors can be selected for combined use according to actual needs.
The denitration device 200 may be implemented by using the existing denitration equipment or denitration method to eliminate or reduce NOx in the flue gas, for example, an oxidation method may be used for denitration, and a reduction method may also be used for denitration. In this embodiment, a Selective Catalytic Reduction (SCR) method is used for denitration, that is, hot ammonia gas is added, and NOx is converted into nitrogen gas by using a catalyst in a reactor, thereby achieving the purpose of flue gas denitration.
After the purified flue gas reaches the emission standard, the flue gas can be discharged into the air through the emptying pipe 300. The evacuation pipe 300 may be selected at a suitable height and may form a chimney to vent the gas meeting the emission standards to the atmosphere at a suitable height.
The incineration apparatus 400 may include an incinerator, which may be a direct-fired incinerator or a Regenerative Thermal Oxidizer (RTO). In one embodiment, the regenerative incinerator can be selected to reduce energy consumption and ensure safety. The burning device 400 can be used for heating and burning carbon monoxide, VOCs and dioxin, and converting the carbon monoxide, the VOCs and the dioxin into harmless components such as carbon dioxide or water, and the burning effect is ensured.
In one embodiment, an incineration device 400 is arranged between said dust removal device 100 and the de-nitrification device 200 by means of a suitable flue gas duct. The CO content in the flue gas to be treated is 5601-3The content of VOCs is 100-500mg/Nm3The content of dioxin is 1-5ng TEQ/Nm3And burning CO in the flue gas to be treated by using the incinerator under the condition of keeping the temperature of 800-1100 ℃ so as to burn the flue gas to be treated. Through detection, the content of CO in the smoke after incineration treatment is 20-800mg/Nm3The content of VOCs is 5-10mg/Nm3The content of dioxin is less than 0.1ng TEQ/Nm3. I.e. CO is converted into CO after incineration treatment2VOCs and dioxin are converted into water and carbon dioxide to realize the removal of pollutants. Generally, the flue gas itself contains a large amount of H2O (about 15-18% by volume) and CO2(about 5-8% by volume) H produced by combustion of VOCs2O is relatively small (e.g., 0.05% by volume). The flue gas contains a large amount of CO2CO produced by combustion2Relatively few (e.g., 0.5% by volume).
Meanwhile, when the denitration device 200 performs denitration treatment, the flue gas to be treated needs to be heated to a certain temperature, and the temperature of the flue gas discharged from the combustion furnace after dust removal treatment is lower than the temperature required for denitration. By utilizing the embodiment of the utility model, after VOCs and dioxin are removed by the incineration device 400, the temperature of the flue gas to be treated can be increased, good conditions are provided for denitration treatment, and the process and the step of specially heating the flue gas before denitration can be omitted, namely, the function and the effect of denitration and preheating can be realized by incineration treatment; the method can also reduce the cost, avoid or reduce the VOCs and the dioxin from entering the denitration device, save the subsequent treatment process and reduce the cost of flue gas purification treatment. Generally, for a project with 10 ten thousand Nm3/h smoke volume, when the smoke to be treated is improved by adding fuel by using the prior art, the annual fuel cost is about 800 ten thousand yuan; by utilizing the technology provided by the patent, the annual fuel cost is only 180 ten thousand yuan, so that the cost of flue gas purification is greatly reduced.
It can be understood that the combustible components in the flue gas to be treated are not only CO, VOCs and dioxin, but also other combustible components. According to the above description, it can also be determined that the higher the combustible component in the flue gas to be treated, the better the combustion performance; the amount of fuel added, the fuel addition rate, the temperature in the combustion furnace, and the like can be controlled according to the flue gas to be treated, so as to balance the heat resistance and the flue gas purification efficiency of the incineration device 400.
Of course, the main purpose of the present invention is to avoid or reduce the disadvantages of complicated process and high treatment cost caused by the presence of VOCs and dioxins in the flue gas purification process, so the installation position of the incineration device 400 can be determined according to actual needs, and the installation position is not necessarily arranged between the dust collector 100 and the denitration device 200, as long as the installation position is communicated with the exhaust pipe 300 through the flue gas pipeline.
As shown in the figure, the incineration type flue gas purification system provided by this embodiment may further include a preheating heat exchanger 500; the preheating heat exchanger 500 is disposed between the dust collector apparatus 100 and the incineration apparatus 400. The preheat exchanger 500 includes a first pass and a second pass for heat exchange. The first passage provides a flue gas channel and comprises a flue gas inlet 511 and a flue gas outlet 512, the flue gas inlet 511 is communicated with the flue gas outlet 102 of the dust removing device 100 through a flue gas pipeline, and the flue gas outlet 512 is communicated with the flue gas inlet 401 of the burning device 400 through a flue gas pipeline. The second path provides a passage for the flue gas exhausted from the denitration device 200, the flue gas inlet 521 is communicated with the flue gas outlet 202 of the denitration device 200 through a flue gas pipeline, and the flue gas outlet 522 is directly or indirectly communicated with the emptying pipe 300 through a flue gas pipeline. The temperature of the flue gas discharged from the denitration device 200 is high, and the temperature of the flue gas discharged from the dedusting device 100 is low; the two can exchange heat through the preheating heat exchanger 500, so that the temperature of the flue gas entering the incineration device 400 is raised, and the temperature of the flue gas discharged from the denitrification device 200 is reduced. Through preheating heat exchanger 500, can utilize heat to preheat the flue gas that gets into and burn device 400 in the denitration treatment back flue gas, make full use of system's heat reduces or reduces and burns device 400 and consume, improves the whole efficiency of system. All the devices with the function of flue gas heat exchange can be used as the preheating heat exchanger 500 in the present invention, and the present invention is not limited in particular.
In order to promote the smooth through flow of the flue gas, a corresponding induced draft fan may be further disposed in the flue gas channel in front of the first passage of the preheating heat exchanger 500 to promote the flow of the flue gas.
As shown in fig. 1, the incineration type flue gas purification system provided by this embodiment further includes a desulfurization device 600 and a white-eliminating heat exchanger 700.
The desulfurization device 600 is communicated between the exhaust port 202 of the denitration device 200 and the evacuation pipe 300 through a flue gas pipeline. Thus, the flue gas after denitration treatment can enter the desulfurization device 600 for desulfurization treatment. The desulfurization device 600 may be an existing desulfurization device, such as a multiphase reactor or a spray tower; the wet desulfurization can be selected, and the dry desulfurization can also be selected. In order to control the flue gas entering the desulfurization device 600 and ensure smooth circulation of the flue gas, a proper induced draft fan can be arranged in the introduced flue gas pipeline of the desulfurization device 600.
The desuperheating heat exchanger 700 may be connected after the denitrating apparatus 200. In the present embodiment, the white elimination heat exchanger 700 is disposed after the preheat heat exchanger 500. The white elimination heat exchanger 700 includes a white elimination gas passage and a white elimination gas passage for heat exchange. The smoke inlet 711 of the white smoke eliminating channel is communicated with the smoke outlet 202 of the denitration device 200 through a proper smoke pipeline, and the smoke outlet 712 is communicated with the smoke inlet of the desulfuration device 600 through a smoke pipeline. The inlet 721 of the white eliminating gas passage introduces white eliminating gas, and the outlet 722 is communicated with the emptying pipe 300 through a flue gas pipeline, and the white eliminating gas can be air or other gases. In order to control the introduction of the white reducing gas, the inlet 721 of the white reducing gas passage may be provided with an appropriate induced draft fan to control the introduction of the white reducing gas (air).
In this embodiment, the principle of using the white heat exchanger 700 is as follows: the air is preheated by using the heat in the flue gas after the denitration treatment, and the preheated air is mixed with the air to be exhausted after the purification treatment, so that the temperature of the air exhaust body can be increased, the white smoke phenomenon of the air exhaust body is reduced, and the corrosion of the air exhaust body on the exhaust pipe 300 is reduced.
In order to avoid overheating of the incineration device 400 and influence the reliability and service life of the incineration device 400, in the incineration type flue gas purification system, the incineration device 400 comprises a plurality of energy storage oxidation furnaces 410 and an incineration furnace 420, each energy storage oxidation furnace 410 comprises an oxidation chamber 411, a smoke inlet branch pipe 412 and a smoke outlet branch pipe 413 which are communicated with the oxidation chamber 411, the smoke inlet branch pipes 412 of the plurality of energy storage oxidation furnaces 410 are communicated with the smoke inlet 401 of the incineration device 400, and the smoke outlet branch pipes 413 of the plurality of energy storage oxidation furnaces 410 are communicated with the smoke outlet 402 of the incineration device 400. The smoke inlet branch pipe 412 and the smoke outlet branch pipe 413 are provided with switch valves to control the on-off of the pipelines, so that the smoke can be fed and discharged, the smoke feeding, smoke cleaning and discharging processes of each energy storage oxidation furnace 410 can be controlled, and the working period of each energy storage oxidation furnace 410 can be controlled. In this embodiment, the energy storage oxidizing furnaces 410 are intermittently operated by controlling the switch valve, so that the temperature of each energy storage oxidizing furnace 410 is maintained within a suitable range, thereby preventing the energy storage oxidizing furnaces 410 from being overheated, and improving the reliability and the service life of the incineration device 400.
In this embodiment, the switch valve corresponding to each energy storage oxidation furnace 410 is an electrically controlled switch valve. The incineration device 400 comprises an incineration controller connected with a plurality of electrically controlled switch valves, namely, the control ends of the incineration controller are respectively connected with the signal input ends of the electrically controlled switch valves by signals, so as to realize the automatic control of a plurality of energy storage oxidation furnaces 410, and thus, the energy storage oxidation furnaces 410 can work intermittently.
In the incineration apparatus 400, an incinerator 420 is disposed at the upper portion of the plurality of oxidation chambers 411 and is communicated with the same, and the incinerator 420 is provided with a proper burner and a fuel inlet for facilitating fuel introduction and ignition incineration. The heat insulation structure is arranged among the oxidation chambers 411 of the energy storage oxidation furnaces 410, for example, heat insulation materials are filled in the heat insulation structure, so that the mutual influence among the oxidation chambers 411 can be prevented, and the reliability and the service life of the incineration device 400 are further improved.
It is understood that the incineration apparatus 400 may include only one energy storage oxidation furnace 410, or may include a plurality of energy storage oxidation furnaces 410.
In order to further purify the flue gas and ensure the exhaust gas to reach the standard, in this embodiment, an evacuation dust collector 310 and a demister 320 are further disposed in the evacuation pipe 300. The evacuation dust collector 310 is located between the outlet 722 of the white elimination gas passage and the communication position of the evacuation pipe 300. A demister 320 may be located before the evacuation dust separator 310 to reduce the water content in the gas and reduce the corrosive effects on the dust separator 310. Of course, an on-line monitoring device may be further disposed in the evacuation pipe 300 to monitor the pollutant content of the evacuated air body in real time.
Based on the incineration type flue gas purification system, the utility model also provides an incineration type flue gas purification method. Of course, the incineration flue gas purification method provided by the present invention can be implemented in the incineration flue gas purification system, but is not limited to the incineration flue gas purification system.
Referring to fig. 2, it is a schematic diagram of an incineration flue gas purification method according to an embodiment of the present invention. In this embodiment, the incineration type flue gas purification method includes the steps of:
s100, a dust removal step, namely performing dust removal treatment on the flue gas discharged by the combustion furnace to avoid equipment blockage in the subsequent flue gas preheating and denitration processes. After the dust removal treatment, the flue gas to be treated may contain predetermined CO or other combustible components.
S200, an incineration flue gas preheating step, namely preheating the flue gas to be treated in the incineration step by utilizing the flue gas treated in the denitration step, and transferring the heat of the flue gas treated in the denitration step into the flue gas to be treated in the incineration step so as to reduce the energy consumption in the incineration step.
S300, an incineration step, namely, removing pollutants in the smoke by incinerating combustible components of the smoke to be treated.
S400, a denitration step, namely removing NOx in the smoke to be treated.
S500, a white gas elimination heating step, namely, heat exchange is carried out between the flue gas to be treated and air (white gas elimination gas) after the flue gas is treated in the denitration step. Through the step, the temperature of the flue gas to be treated entering the desulfurization step can be reduced, and the temperature of the white gas can be increased. The evaporation capacity of the desulfurization step can be reduced by reducing the flue gas to be treated; the temperature of the white gas eliminating gas is increased, so that condensed water vapor in the smoke discharging process can be reduced, and the white smoke phenomenon of the evacuated smoke can be reduced.
S600, a desulfurization step, namely removing sulfur dioxide in the flue gas to be treated.
After the purification meets the evacuation condition, the air is discharged into the atmosphere through an evacuation pipe.
The specific content can refer to the description of the embodiment of the incineration type flue gas purification system, by using the incineration type flue gas purification method, the denitration step is to process the flue gas to be treated and then evacuate the flue gas, the denitration step is preceded by the incineration step, pollutants such as carbon monoxide, VOCs and dioxin in the flue gas are removed by the incineration step through the incineration of the flue gas to be treated, the temperature of the flue gas to be purified is raised to the denitration temperature, and the denitration preparation temperature is between 250 and 450 ℃. Corresponding to the incineration type flue gas purification system, on one hand, carbon monoxide, VOCs and dioxin can be converted into carbon dioxide or water, so that the situation that the VOCs and the dioxin enter other devices and then enter absorption slurry or other substances is avoided or reduced, a subsequent treatment process is omitted, and the flue gas purification treatment cost is reduced; on the other hand, because the step of burning is set up before passing through the denitration step, after getting rid of VOCs and dioxin through burning the device, pending flue gas temperature improves to between 250 degrees to 450 degrees, can save the process and the step of heating the flue gas between the denitration, and then reduce cost, reduce the gas cleaning energy consumption.
It is understood that the incineration step is only required before evacuation, and is not necessarily required to be arranged before the denitration step, and specific steps can be arranged and arranged correspondingly according to the type, composition and application environment of the flue gas to be treated.
In order to preheat the flue gas entering the incineration step by utilizing the heat in the flue gas after denitration treatment, fully utilize the heat of a system, reduce or reduce the consumption of the incineration step and improve the overall efficiency of the system, the flue gas after denitration treatment is utilized to preheat the flue gas to be treated in the incineration step. This can be accomplished by preheating the heat exchanger 500 as described above.
Of course, in the case where the flue gas to be treated needs to be desulfurized, a desulfurization step may be included after the denitration step and before the evacuation. And carrying out desulfurization treatment on the flue gas subjected to denitration treatment through the desulfurization step. In order to eliminate the white smoke during evacuation, the air (white smoke elimination gas) may be heated by the flue gas after the denitration step and before the desulfurization step, and the heated air may be introduced into the evacuation pipe 300 and then mixed with the gas (gas to be evacuated) during the desulfurization step. Therefore, the temperature of the exhaust air body can be increased, the white smoke phenomenon of the exhaust air body can be eliminated or reduced, and the corrosion of the exhaust air body to the exhaust pipe can be reduced.
The foregoing has outlined in detail certain embodiments of the utility model. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the core concepts of the present invention. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (10)
1. An incineration type flue gas purification system comprises a dust removal device (100), a denitration device (200) and an emptying pipe (300) which are sequentially communicated through a flue gas pipeline, and is characterized by further comprising an incineration device (400) communicated in front of the emptying pipe (300) through the flue gas pipeline;
the incineration device (400) is used for incinerating combustible components of the flue gas to be treated and removing pollutants in the flue gas to be treated.
2. The incinerating flue gas cleaning system according to claim 1, wherein the incinerating device (400) communicates between the dedusting apparatus (100) and the denitrating apparatus (200) through the flue gas duct.
3. The incinerating flue gas cleaning system according to claim 2, further comprising a preheat exchanger (500); the preheat exchanger (500) includes a first pass and a second pass for heat exchange; the smoke inlet (511) of the first passage is communicated with the smoke outlet (102) of the dust removal device (100) through a smoke pipeline, and the smoke outlet (512) is communicated with the smoke inlet (401) of the incineration device (400) through a smoke pipeline; the smoke inlet (521) of the second passage is communicated with the smoke outlet (202) of the denitration device (200) through a smoke pipeline, and the smoke outlet (522) of the second passage is communicated with the emptying pipe (300) through a smoke pipeline.
4. The incinerating flue gas cleaning system according to any one of claims 1 to 3, further comprising a desulphurisation device (600), wherein the desulphurisation device (600) is in communication between the smoke outlet (202) of the denitriding device (200) and the emptying pipe (300) via a flue gas duct;
also comprises a white-eliminating heat exchanger (700):
the white-eliminating heat exchanger (700) comprises a white-eliminating smoke channel and a white-eliminating gas channel for heat exchange; a smoke inlet (711) of the white smoke eliminating channel is communicated with a smoke outlet (102) of the dust removal device (100) through a smoke pipeline, and a smoke outlet (712) is communicated with a smoke inlet of the desulfurization device (600) through a smoke pipeline; the inlet (721) of the white eliminating gas passage introduces white eliminating gas, and the outlet (722) is communicated with the emptying pipe (300) through a flue gas pipeline.
5. An incinerating flue gas cleaning system according to any one of claims 1 to 3, wherein the incinerating apparatus (400) comprises an incinerator (420) and a plurality of energy-storing oxidizers (410) in communication with the incinerator (420); each energy storage oxidation furnace (410) comprises an oxidation chamber (411), a smoke inlet branch pipe (412) and a smoke outlet branch pipe (413) which are communicated with the oxidation chamber (411); a plurality of smoke inlet branch pipes (412) of the energy storage oxidation furnace (410) are communicated with the smoke inlet (401) of the incineration device (400); a plurality of smoke outlet branch pipes (413) of the energy storage oxidation furnace (410) are communicated with a smoke outlet (402) of the incineration device (400).
6. The incinerating flue gas cleaning system of claim 5, further comprising an incinerating controller; the smoke inlet branch pipe (412) and the smoke outlet branch pipe (413) are provided with electric control switch valves; and the control end of the burning controller is respectively connected with the signal input end of the electric control switch valve through signals.
7. The incinerating flue gas cleaning system according to claim 5, wherein the incinerating apparatus (400) has a plurality of stored energy oxidizer (410) in upper part communicating with an incinerator (420), and the incinerator (420) is provided with a fuel inlet.
8. The incinerating flue gas cleaning system according to claim 5, wherein a heat insulation structure is provided between the plurality of oxidation chambers (411).
9. The incinerating flue gas cleaning system according to claim 4, characterized in that an evacuation dust collector (310) is provided in the evacuation pipe (300), the location of the evacuation dust collector (310) being located between the outlet (722) of the white depleted gas pathway and the location of communication of the evacuation pipe (300).
10. The incinerating flue gas cleaning system according to claim 9, characterized in that a demister (320) is also provided in the evacuation pipe (300), the demister (320) being located before the evacuation dust separator (310).
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| CN202121426582.1U CN216977554U (en) | 2021-06-25 | 2021-06-25 | Incineration type flue gas purification system |
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