CN216977555U - Self-combustion type flue gas purification system - Google Patents
Self-combustion type flue gas purification system Download PDFInfo
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- CN216977555U CN216977555U CN202121428479.0U CN202121428479U CN216977555U CN 216977555 U CN216977555 U CN 216977555U CN 202121428479 U CN202121428479 U CN 202121428479U CN 216977555 U CN216977555 U CN 216977555U
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Abstract
The utility model discloses a self-combustion type flue gas purification system. The disclosed spontaneous combustion 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, and further comprises a spontaneous combustion device communicated with the front part of the emptying pipe through the flue gas pipeline; the spontaneous combustion device is used for burning CO in the flue gas to be treated, so that the flue gas to be treated is spontaneously combusted, and pollutants in the flue gas to be treated are removed. Therefore, CO in the flue gas to be treated can be fully utilized as fuel, the flue gas to be treated can be spontaneously combusted, and the energy consumption for purifying the flue gas can be greatly reduced without adding external fuel. In the flue gas spontaneous combustion process, 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 desulfurization and other absorption serosity, and the subsequent treatment process of the absorption serosity is omitted.
Description
Technical Field
The utility model relates to a flue gas purification technology, in particular to a self-combustion flue gas purification system.
Background
The flue gas discharged from combustion furnaces (sintering furnaces, shaft furnaces, rotary kilns and blast furnaces) comprises dust and NOX、SOx、CO(6-10kmg/NM3)、VOCs(1000mg/NM3) And dioxins, etc. To reduce the harmful pollutants in the flue gas, it is often necessary to purify the flue gas.
The flue gas purification flow generally comprises dust removal, desulfurization, denitration and then evacuation, so that the nitrate and the sulfur can be removed before evacuation, and the flue gas purification is realized. Among them, Volatile Organic Compounds (VOCs) and dioxins often enter the absorption slurry during desulfurization and denitration processes, and become components of the absorption slurry. During the filtering treatment process of the absorption slurry, harmful substances formed by VOCs and dioxin are left in the filter cake, which can cause the filter cake to be difficult to treat and further become 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 a self-combustion type flue gas purification system which can utilize combustible components in flue gas to be treated as an energy source, realize flue gas self-combustion, remove pollutants in the flue gas and reduce the energy consumption of flue gas purification.
The utility model provides a self-combustion type flue gas purification system, which comprises a dust removal device, a denitration device and an emptying pipe which are sequentially communicated through a flue gas pipeline, and further comprises a self-combustion device communicated with the front part of the emptying pipe through the flue gas pipeline; the spontaneous combustion device is used for burning CO in the flue gas to be treated, so that the flue gas to be treated is spontaneously combusted to remove pollutants in the flue gas to be treated. Therefore, CO in the flue gas to be treated can be fully utilized as fuel, the flue gas to be treated can be spontaneously combusted, external fuel is not required to be added, or the addition of external fuel can be greatly reduced, and further the energy consumption for purifying the flue gas can be greatly reduced. Pollutants in the flue gas to be treated can be removed in the flue gas spontaneous combustion process, VOCs and dioxin are prevented or reduced from entering absorption serosity for desulfurization and the like, and the subsequent treatment process of the absorption serosity is omitted. The self-combustion type flue gas purification system reduces the treatment cost of VOCs, dioxin, denitration and desulfurization of flue gas.
In the preferred technical scheme, the spontaneous combustion 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 which is discharged from the combustion furnace and subjected to dust removal treatment is lower than the temperature required by denitration. After the flue gas to be treated is spontaneously combusted by the spontaneous combustion device, after pollutants such as VOCs (volatile organic compounds), dioxin and the like are removed, the temperature of the flue gas to be treated can be increased, good conditions can be provided for denitration treatment, the energy consumption for heating the flue gas before denitration can be reduced, the cost is further reduced, and the function and the effect of preheating the denitration flue gas can be realized by spontaneous combustion treatment.
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 spontaneous combustion 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 in the flue gas after the denitration treatment to preheat the flue gas that gets into spontaneous combustion device, make full use of system's heat reduces or reduces spontaneous combustion device and consumes, improves system's overall efficiency.
In a further technical scheme, the spontaneous combustion type flue gas purification system also comprises a desulfurization device, wherein the desulfurization device is communicated between a smoke outlet of the denitrification device and the emptying pipe through a flue gas pipeline;
still include the white heat exchanger that disappears: the white-removing heat exchanger comprises a white-removing smoke channel and a white-removing gas channel 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 outlet of the white smoke eliminating channel 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 spontaneous combustion device comprises an ignition device so as to combust CO of the flue gas to be treated. Different from the incineration device, the ignition device in the spontaneous combustion device only ignites at the starting stage with lower temperature or under a specific working condition and the like to treat the flue gas.
In a preferred technical scheme, the spontaneous combustion device comprises a spontaneous combustion furnace and an energy storage oxidation furnace communicated with the spontaneous combustion furnace; the energy storage oxidation furnace comprises an oxidation chamber, a smoke inlet branch pipe and a smoke outlet branch pipe which are communicated with the oxidation chamber; the smoke inlet branch pipe of the energy storage oxidation furnace is communicated with the smoke inlet of the spontaneous combustion device; and a smoke outlet branch pipe of the energy storage oxidation furnace is communicated with a smoke outlet of the spontaneous combustion device. Therefore, convenience is provided for the spontaneous combustion of the flue gas, and the spontaneous combustion efficiency is improved.
In a further technical scheme, the spontaneous combustion device comprises a spontaneous combustion controller and a plurality of energy storage oxidation furnaces; the smoke inlet branch pipe and the smoke outlet branch pipe are provided with electric control switch valves; and the control end of the spontaneous combustion controller is respectively connected with the signal input end of the electric control switch valve through signals so as to control the oxidation of the energy storage oxidation furnace. Therefore, each energy storage oxidation furnace can work intermittently, the temperature of each energy storage oxidation furnace is kept in a proper range, the energy storage oxidation furnace is prevented from being overheated, and the reliability and the service life of the spontaneous combustion device are improved.
In a further optional technical scheme, a heat insulation structure is arranged among the 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 collector.
The self-combustion 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 evacuating, wherein the flue gas to be treated has appropriate content of CO, and the self-combustion step is also included before evacuation; the step of autoigniting comprises: and CO in the flue gas to be treated is combusted, so that the flue gas to be treated is self-combusted, and pollutants such as carbon monoxide, VOCs, dioxin and the like in the flue gas are removed. Corresponding to the self-combustion type flue gas purification system, the self-combustion type flue gas purification method can fully utilize CO in the flue gas to be treated as fuel to enable the flue gas to be treated to be self-combusted, remove pollutants in the flue gas to be treated in the self-combustion process, and can greatly reduce the addition of external fuel without adding the external fuel, thereby greatly reducing the energy consumption of flue gas purification. In the spontaneous combustion process, VOCs and dioxin can be simultaneously converted into carbon dioxide or water, so that the VOCs and the dioxin are prevented or reduced from entering desulfurization absorption slurry or other slurries, the subsequent treatment process of the slurries is omitted, and the cost of spontaneous combustion type flue gas purification treatment is reduced.
In a preferred technical scheme, the spontaneous combustion step is performed before the denitration step; through the spontaneous combustion 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 VOCs and dioxin are removed through spontaneous combustion of the spontaneous combustion device, the temperature of the flue gas to be treated can be increased to 250-450 ℃, a suitable temperature condition is provided for denitration treatment, the process and the step of heating the flue gas before denitration can be omitted, the energy consumption is reduced, the treatment process is simplified, and the flue gas purification cost is reduced.
In a preferred technical scheme, the flue gas to be treated in the spontaneous combustion step is heated by utilizing the flue gas treated in the denitration step. The flue gas entering the spontaneous combustion step can be preheated by utilizing the heat in the flue gas after the denitration treatment, the heat of the system is fully utilized, the spontaneous combustion step is convenient, the dependence on ignition is reduced, and the overall efficiency of the system is improved.
In the preferred technical scheme, a desulfurization step is also included after the denitration step and before the evacuation; 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 white exhaust gas can be preheated by utilizing the heat in the flue gas after denitration treatment, 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 or eliminated, and the corrosion of the exhausted flue gas on an exhaust pipe is reduced.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of the self-ignition flue gas purification system of the present invention;
fig. 2 is a flow chart of an embodiment of the self-ignition flue gas purification method of the present invention.
Detailed Description
Embodiments of the self-ignition type flue gas purification system and the self-ignition type flue gas purification method provided by the utility model are described below with reference to the accompanying drawings. In this document, the meaning of the terms such as "front" and "back" should be determined by considering the implementation state and the process sequence of the self-ignition type flue gas purification system and the self-ignition type flue gas purification method, and should not be construed as any limitation to the patent. In addition, in this document, "self-ignition" refers to combustion without the addition of external fuel by virtue of the nature of the constituents in the flue gas to be treated, and "self-ignition" can be carried out by ignition with external fuel or devices, or can be carried out by addition of air or oxygen for combustion of CO.
Referring to fig. 1, it is a schematic structural diagram of an embodiment of the self-ignition flue gas purification system of the present invention. The self-ignition type flue gas purification system comprises a dust removal device 100, a denitration device 200, an emptying pipe 300 and a self-ignition device 400 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 selected for denitration, that is, hot ammonia gas is added, and NOx is converted into nitrogen gas by using a catalyst in a reactor, so as to achieve 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 an appropriate height and may form a chimney to discharge the gas meeting the emission standards to the atmosphere at an appropriate height.
The auto-ignition device 400 may include an auto-ignition furnace, which may be a direct combustion furnace or a Regenerative Thermal Oxidizer (RTO). In one embodiment, regenerative burners may be selected to reduce energy consumption and ensure safety. It is understood that the spontaneous combustion device 400 may include an ignition device to ignite CO in the flue gas to be treated, so as to realize spontaneous combustion of the flue gas to be treated. In the process of spontaneous combustion of the flue gas to be treated, carbon monoxide, VOCs and dioxin can be heated and converted into carbon dioxide or water and other harmless components, so that the effect of purifying the flue gas is realized.
In one embodiment, a spontaneous combustion device 400 is provided between the 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 7000-3The content of VOCs is 300-500mg/Nm3、CO212.0% (Vol), 13.0% (Vol) of water, and 6-9ng TEQ/Nm of dioxin3. By utilizing the heat accumulating type self-combustion furnace, CO in the flue gas to be treated is combusted under the condition of keeping the temperature of 820-1100 ℃, so that the flue gas to be treated is self-combusted. Through detection, the content of CO in the flue gas after spontaneous combustion treatment is about 100-800mg/Nm3The content of VOCs is 5-8mg/Nm3、CO212.4% (Vol), 13.2% (Vol) water content, and < 0.1ng TEQ/Nm dioxin content3. I.e. CO is converted to CO after spontaneous combustion treatment2VOCs and dioxins are converted to carbon dioxide or water.
In another embodiment, a spontaneous combustion device 400 is provided between the dust removal device 100 and the de-nitrification device 200 by means of a suitable flue gas duct. The CO content in the smoke to be treated is 1200-2500mg/Nm3The content of VOCs is 1000-1500mg/Nm3、CO2The content of SO was 8.5% (Vol), the water content was 12% (Vol)2Content 500-600mg/Nm3Organic sulfur 300 + 500mg/Nm3The content of dioxin is 1-5ng TEQ/Nm3. And under the condition of keeping the temperature of 800-1100 ℃, CO and VOCs in the flue gas to be treated are combusted, so that the flue gas to be treated is self-combusted. Through detection, the content of CO in the flue gas after spontaneous combustion treatment is 200-600mg/Nm3The content of VOCs is 10-15mg/Nm3、CO2The content of TEQ/Nm is less than 0.1ng, the content of water is 8.8% (Vol), the content of water is 12.3% (Vol), and the content of dioxin is3、SO2The content is 900-1200mg/Nm3. I.e. CO is converted to CO after spontaneous combustion treatment2VOCs and dioxins are converted into carbon dioxide or water, and organic sulfur is converted into SO2。
Thus, it can be fully beneficialThe CO in the flue gas to be treated is used as fuel, so that the flue gas to be treated is self-ignited, the addition of external fuel is not needed, or the addition of external fuel can be greatly reduced, and further, the energy consumption for purifying the flue gas can be greatly reduced. VOCs, dioxin and/or sulfur dioxide can be converted into carbon dioxide, water and sulfur trioxide in the flue gas spontaneous combustion process, and the sulfur trioxide can be easily treated in the subsequent treatment process (such as a dust removal process or a fog process), SO that the VOCs, the dioxin and the SO can be treated2And by removing the pollutants, the VOCs and the dioxin are prevented or reduced from entering the desulfurization absorption slurry, and the subsequent treatment process of the desulfurization absorption slurry is omitted.
It can be understood that the CO content of the flue gas to be treated is kept in a proper range, and the self-ignition of the flue gas to be treated can be realized by the existing ignition mode, or the flue gas to be treated can be kept self-ignited by keeping a proper temperature. In a preferred embodiment, the CO content of the flue gas to be treated is more than 6000mg/Nm3In time, the spontaneous combustion of the flue gas to be treated can be realized; of course, the skilled person can burn the flue gas to be treated by means of ignition at the beginning stage and then maintain the spontaneous combustion according to the spontaneous combustion environment, the components and the proportion of the components in the flue gas to be treated. According to the description above, it can also be determined that the higher the combustible component in the flue gas to be treated, the better the spontaneous combustion performance; the temperature in the combustion furnace can be controlled according to the difference of the spontaneous combustion performance of the flue gas to be treated, so as to balance the heat resistance and the flue gas purification efficiency of the spontaneous combustion device 400.
In addition, it is particularly important that the flue gas to be treated is heated to a certain temperature when the denitration device 200 performs the denitration treatment, and the temperature of the flue gas discharged from the combustion furnace after the dust removal treatment is lower than the temperature required for the denitration treatment. By utilizing the embodiment of the utility model, after pollutants such as VOCs, dioxin and the like are removed by the spontaneous combustion device 400, the temperature of the flue gas to be treated can be increased to 250-450 ℃, good conditions can be provided for denitration treatment, the process and the step of specially heating the flue gas before denitration can be omitted, namely, the spontaneous combustion treatment can realize the function and the effect of denitration and preheating, and the cost of flue gas purification treatment is reduced. Generally, for 10 ten thousand Nm3Item of/h Smoke gas amount, using the prior art, byWhen fuel is added to improve the smoke to be treated, the annual fuel cost is about 800 ten thousand yuan; by utilizing the technology provided by the patent, the annual fuel cost (only used for igniting the flue gas to be treated) is only 100 ten thousand yuan, so that the cost of flue gas purification is greatly reduced.
The main purpose of the utility model is to fully utilize CO in the flue gas to be treated, to burn the CO and the flue gas to be treated, to remove pollutants in the flue gas to be treated in the burning process, and to greatly reduce the energy consumption for purifying the flue gas without adding external fuel or greatly reduce the addition of external fuel. Meanwhile, the defects of complex process and high treatment cost caused by the existence of VOCs and dioxin in the self-ignition type flue gas purification process can be avoided or reduced, so that the arrangement position of the self-ignition device 400 can be determined according to actual needs, and the self-ignition device is not necessarily arranged between the dust removal device 100 and the denitration device 200 as long as the self-ignition device is communicated with the exhaust pipe 300 through the flue gas pipeline.
It will be appreciated that, in order to ensure the self-ignition effect, the self-ignition device 400 may comprise an ignition device to burn the CO of the flue gas to be treated. Therefore, the reliability of CO combustion can be ensured, the combustion effect is ensured, and the flue gas purification effect is ensured.
As shown in the figure, the self-ignition flue gas purification system provided by this embodiment may further include a preheating heat exchanger 500; the preheat exchanger 500 is disposed between the precipitator device 100 and the auto-ignition device 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, wherein the flue gas inlet 511 is communicated with the flue gas outlet 102 of the dust removal device 100 through a flue gas pipeline, and the flue gas outlet 512 is communicated with the flue gas inlet 401 of the spontaneous combustion 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 spontaneous combustion device 400 is increased, and the temperature of the flue gas discharged from the denitration device 200 is reduced. Through preheating heat exchanger 500, can utilize heat in the flue gas after the denitration treatment to preheat the flue gas that gets into spontaneous combustion device 400, make full use of system's heat reduces or reduces spontaneous combustion device 400 and consumes, improves the whole efficiency of system. The devices with the flue gas heat exchange function can be used as the preheating heat exchanger 500 in the present invention, and the present invention is not limited thereto.
In order to promote 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 flow of the flue gas.
As shown in fig. 1, the self-ignition type flue gas purification system provided by the present embodiment further includes a desulfurization device 600 and a white 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; wet or dry desulfurizing can be used. 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 whitening heat exchanger 700 includes a whitening gas channel and a whitening gas channel 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 operation principle of the white heat exchanger 700 is as follows: the air is preheated by using the heat in the flue gas after denitration treatment, and the preheated air is mixed with the air to be exhausted after 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 air exhaust pipe 300 is reduced.
In order to avoid overheating the auto-ignition device 400 and affecting the reliability and service life of the auto-ignition device 400, the auto-ignition device 400 in the auto-ignition flue gas cleaning system comprises an auto-ignition controller (not shown), an auto-ignition furnace 420 and a plurality of energy storage oxidation furnaces 410 communicated with the auto-ignition furnace 420. The auto-ignition furnace 420 provides space for auto-ignition of flue gas to be treated. In this embodiment, the multiple energy-storage oxidation furnaces 410 are located above the auto-combustion 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 spontaneous combustion device 400; the smoke outlet branch pipes 413 of the plurality of energy storage oxidation furnaces 410 are communicated with the smoke outlet 402 of the spontaneous combustion device 400. The oxidation chamber 411 provides combustion or combustion preparation for the flue gas or combustible components.
In this embodiment, the smoke inlet branch pipe 412 and the smoke outlet branch pipe 413 are provided with electrically controlled switch valves; the on-off of the pipeline is controlled, the flue gas is discharged and enters, the flue gas entering, 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 is controlled.
And the control end of the spontaneous combustion controller is respectively connected with the signal input end of the electric control switch valve through signals. Thus, each spontaneous combustion furnace can work intermittently, the temperature of each energy storage oxidation furnace 410 and each oxidation chamber 411 can be kept in a proper range, overheating of the energy storage oxidation furnace 410 and each oxidation chamber 411 is avoided, and reliability and service life of the spontaneous combustion device 400 are improved.
The self-ignition furnace 420 may be provided with an ignition device to ignite the flue gas at the start-up stage or at a lower temperature and provide a precondition for self-ignition of the flue gas. 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 spontaneous combustion device 400 are further improved.
It is understood that the auto-ignition device 400 may include only one auto-ignition furnace 410, or may include a plurality of auto-ignition furnaces 410 connected in parallel or in series.
In order to further purify the flue gas and ensure that the exhaust gas reaches 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 self-combustion type flue gas purification system, the utility model also provides a self-combustion type flue gas purification method. Of course, the self-ignition flue gas purification method provided by the utility model can be implemented by the self-ignition flue gas purification system, but is not limited to the self-ignition flue gas purification system.
Please refer to fig. 2, which is a schematic diagram of an embodiment of the self-ignition flue gas purification method of the present invention. In this embodiment, the self-ignition flue gas purification method comprises the following steps:
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 spontaneous combustion flue gas preheating and denitration processes. After the dust removal treatment, the flue gas to be treated has a predetermined content of CO, such as more than 6000mg/NM3So as to facilitate the ignition of CO and further promote the spontaneous combustion of the flue gas to be treated.
S200, a self-ignition flue gas preheating step, namely, the flue gas treated in the denitration step is used for preheating the flue gas to be treated in the self-ignition step, and the heat of the flue gas treated in the denitration step is transferred to the flue gas to be treated in the self-ignition step, so that the self-ignition in the flue gas to be treated is facilitated.
S300, a spontaneous combustion step, namely burning CO in the flue gas to be treated to enable the flue gas to be treated to be spontaneous combustion and remove pollutants in the flue gas. Corresponding to the self-combustion type flue gas purification system, the self-combustion type flue gas purification system can keep a preset temperature in a self-combustion device so as to keep the flue gas to be treated self-combustion; the flue gas to be treated can also be ignited by the ignition device, so that the flue gas to be treated can be spontaneously combusted.
S400, a denitration step, namely removing NOx in the flue gas 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 elimination gas is increased, so that condensed water vapor during the emission of the flue gas can be reduced, and the white smoke phenomenon of the evacuated flue gas 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.
Corresponding to the self-combustion type flue gas purification system, on one hand, pollutants such as VOCs, dioxin and the like can be converted into carbon dioxide or water or easily treated components, so that the VOCs and the dioxin are prevented or reduced from entering desulfurization absorption slurry, a subsequent treatment process is omitted, and the flue gas purification treatment cost is reduced; on the other hand, the spontaneous combustion step is arranged before the denitration step, and after the carbon monoxide, the VOCs and the dioxin are removed by the spontaneous combustion device, the temperature of the flue gas to be treated is increased to 250-450 ℃, so that the process and the step of heating the flue gas in the denitration process can be omitted, the cost is reduced, and the energy consumption of flue gas purification is reduced.
It will be understood that the spontaneous combustion step is only required before evacuation and need not be provided before the denitration step, and the specific steps can be arranged according to the type, composition and application environment of the flue gas to be treated.
In order to preheat the flue gas entering the spontaneous combustion 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 spontaneous combustion 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 spontaneous combustion 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 evacuation. And carrying out desulfurization treatment on the flue gas subjected to denitration treatment through the desulfurization step. In order to eliminate white smoke during evacuation, the flue gas treated in the denitration step and between the desulfurization steps can be used to heat air (white smoke elimination gas), and the heated air is introduced into the evacuation pipe 300, so that the temperature of the evacuation gas is increased, the white smoke phenomenon of the evacuation gas is eliminated or reduced, and the corrosion of the evacuation gas on the evacuation pipe is reduced.
The foregoing has outlined rather broadly the embodiments of the present invention. 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, without departing from the principle of the present invention, it is possible to make various improvements and modifications to the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (10)
1. A self-ignition 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 also comprising a self-ignition device (400) communicated with the front of the emptying pipe (300) through the flue gas pipeline;
the spontaneous combustion device (400) is used for enabling the flue gas to be treated to be spontaneous combustion by burning CO in the flue gas to be treated so as to remove pollutants in the flue gas to be treated.
2. The self-ignition type flue gas purification system according to claim 1, wherein the self-ignition device (400) is communicated between the dust removal device (100) and the denitration device (200) through the flue gas duct.
3. The self-igniting 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 spontaneous combustion 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 self-ignition type flue gas purification system according to any one of claims 1 to 3, further comprising a desulfurization device (600), wherein 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;
still include white heat exchanger (700) that disappears:
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. A self-igniting flue gas cleaning system according to any one of claims 1 to 3, wherein the self-igniting means (400) comprises an ignition means to burn the CO of the flue gas to be treated.
6. The self-ignition type flue gas purification system according to claim 5, wherein the self-ignition device (400) comprises a self-ignition furnace (420) and an energy storage oxidation furnace (410) communicated with the self-ignition furnace (420); the 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 smoke inlet branch pipe (412) of the energy storage oxidation furnace (410) is communicated with a smoke inlet (401) of the spontaneous combustion device (400); and a smoke outlet branch pipe (413) of the energy storage oxidation furnace (410) is communicated with a smoke outlet (402) of the spontaneous combustion device (400).
7. The self-ignition flue gas purification system according to claim 6, wherein the self-ignition device (400) comprises a plurality of the energy storage oxidizers (410) and a self-ignition 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 spontaneous combustion controller is respectively connected with the signal input end of the electric control switch valve through signals.
8. The self-igniting flue gas cleaning system according to claim 7, wherein a heat insulation structure is provided between a plurality of said oxidation chambers (411).
9. The self-igniting flue gas cleaning system according to claim 4, wherein an evacuation dust collector (310) is provided in the evacuation pipe (300), and the location of the evacuation dust collector (310) is located between the outlet (722) of the white elimination gas passage and the communication location of the evacuation pipe (300).
10. The self-igniting flue gas cleaning system according to claim 9, wherein a demister (320) is further provided in the evacuation pipe (300), the demister (320) being located before the evacuation dust separator (310).
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| CN202121428479.0U CN216977555U (en) | 2021-06-25 | 2021-06-25 | Self-combustion type flue gas purification system |
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| CN202121428479.0U CN216977555U (en) | 2021-06-25 | 2021-06-25 | Self-combustion type flue gas purification system |
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