Kiln flue gas treatment system and treatment method

Abstract

The invention discloses a kiln flue gas treatment system and method. The technical problems that in the prior art, kiln waste gas treatment is large in risk and high in cost are solved. The kiln flue gas treatment system comprises a flue gas discharge pipe, a medicament injection device, a reaction device and a gas output device, and the flue gas discharge pipe is provided with an open hole used for being communicated with a flue gas outlet of a kiln; the medicament injection device is communicated with the open hole and injects a medicament into the flue gas discharge pipe; the reaction device comprises a reaction tank, more than one layer of supporting pieces arranged on the reaction tank and a plurality of catalysts arranged on the supporting pieces, the catalysts are used for catalyzing the reaction of the flue gas and the medicament to generate ionization sparks and form tail gas, the reaction tank is provided with an inlet and an outlet, and the inlet of the reaction tank is communicated with the flue gas discharge pipe; the gas output device is communicated with the outlet of the reaction tank to discharge the tail gas. According to the reaction disclosed by the invention, gas does not need to be additionally heated, harmful substances in the tail gas are few, and additional waste disposal cost is not needed.

Description

Technical Field

[0001] The present application belongs to the technical field of flue gas treatment, and specifically relates to a kiln flue gas treatment system and method. Background Art

[0002] High-temperature reversing open gas kilns will produce NOx and other waste gases during combustion. Due to the factors of open kilns, the oxygen content of the waste gas produced is often higher than that of other equipment. Because the waste gas temperature is between 130℃ and 200℃, the treatment effect of traditional waste gas treatment equipment is weak. In addition, the reversing combustion rhythm of the kiln burner is relatively fast, and the ratio of forced draft changes rapidly. It is difficult and risky to treat such waste gas with traditional equipment, and the one-time investment and operation and maintenance costs of the equipment are relatively high. Summary of the invention

[0003] In order to solve the current technical problem of high risk and high cost of kiln exhaust gas treatment, the present application provides a kiln flue gas treatment system and treatment method.

[0004] In a first aspect of the present application, a kiln fume treatment system is provided, comprising:

[0005] a flue gas discharge pipe, provided with an opening for communicating with the flue gas outlet of the kiln;

[0006] A medicine injection device, connected to the opening and injecting the medicine into the smoke exhaust pipe;

[0007] A reaction device, comprising a reaction tank, one or more layers of support members arranged on the reaction tank, and a plurality of catalysts arranged on the support members, wherein the catalyst is used to catalyze the reaction between the flue gas and the reagent to generate ionized sparks and form tail gas, and the reaction tank is provided with an inlet and an outlet, and the inlet of the reaction tank is connected to the flue gas exhaust pipe;

[0008] A gas output device is connected to the outlet of the reaction tank to discharge the tail gas.

[0009] In some embodiments, the support member is a metal mesh, and the pore size of the metal mesh is 3 cm to 10 cm;

[0010] The catalyst is in a honeycomb, strip or block shape, and the pore size of the catalyst is 0.2 cm to 1.5 cm.

[0011] In some embodiments, the size of each of the catalysts is larger than the pore size of the support.

[0012] In some embodiments, one or more layers of support members have a horizontal projection component in the reaction tank.

[0013] In some embodiments, the catalyst contains at least one of titanium, palladium, rhodium, or palladium.

[0014] In some embodiments, the catalyst is composed of the following components in mass fractions: titanium: 1.0% to 9.0%, mortar: 1.0% to 9.0%, rhodium: 1.0% to 9.0%, palladium: 1.0% to 9.0%, aluminum oxide: 10% to 15%, and the rest is iron and unavoidable impurities.

[0015] In some embodiments, the drug injection device includes a drug storage box for storing drugs, a drug injection pipe connected to the drug storage box and the smoke exhaust pipe, and a drug injection pump provided on the drug injection pipe;

[0016] The agent is urea or ammonia water.

[0017] In some embodiments, the kiln fume treatment system further includes a controller and a temperature sensor provided on the fume exhaust pipe, and the controller is connected to the temperature sensor and the drug injection pump;

[0018] The controller is configured as follows:

[0019] When the temperature sensor detects that the temperature of the flue gas exhaust pipe is lower than 100° C., the opening degree of the injection pump is 0;

[0020] When the temperature sensor detects that the temperature of the flue gas exhaust pipe is 100° C. to 150° C., the opening degree of the injection pump is 100%;

[0021] When the temperature sensor detects that the temperature of the flue gas exhaust pipe is 150°C to 170°C, the opening degree of the injection pump is 60% to 80%;

[0022] When the temperature sensor monitors that the temperature of the flue gas exhaust pipe is 170° C. to 210° C., the opening degree of the injection pump is 50% to 60%.

[0023] In some embodiments, the kiln flue gas treatment system further includes a waste heat utilization device, and the waste heat utilization device performs heat exchange with the exhaust gas.

[0024] In a second aspect of the present application, a treatment method based on the above-mentioned kiln fume treatment system is provided, comprising the following steps:

[0025] Connecting the smoke exhaust pipe to the smoke outlet of the kiln;

[0026] Injecting the agent into the flue gas discharge pipe through the opening by means of an agent injection device;

[0027] The reagent and the flue gas undergo an oxidation-reduction reaction in the reaction tank via the catalyst to generate ionization sparks and form tail gas;

[0028] The tail gas is discharged through the gas output device.

[0029] According to one or more embodiments of the present application, a kiln flue gas treatment system and a treatment method are provided. The kiln flue gas treatment system includes a flue gas exhaust pipe, a reagent injection device, a reaction device and a gas output device. The flue gas exhaust pipe is provided with an opening for connecting with the flue gas outlet of the kiln; the reagent injection device is connected with the opening and injects the reagent into the flue gas exhaust pipe; the reaction device includes a reaction tank and one or more layers of support members provided on the reaction tank and a plurality of catalysts provided on the support members, the catalyst is used to catalyze the reaction of the flue gas and the reagent to generate ionized sparks and form exhaust gas, the reaction tank is provided with an inlet and an outlet, and the inlet of the reaction tank is connected with the flue gas exhaust pipe; the gas output device is connected with the outlet of the reaction tank to discharge the exhaust gas. The present invention injects a reagent into the flue gas discharge pipe, so that the reagent decomposes at the temperature of the flue gas to react with the nitrogen oxides in the flue gas, and then generates ionization sparks through the catalyst of the reaction tank, and burns the flue gas and the mixed gas to produce tail gas. The reaction of the present invention does not require additional gas heating, but only requires the heat of the flue gas to decompose, and then the nitrogen oxides in the flue gas generate ionization sparks and burn to produce nitrogen and water under the action of the catalyst. The content of harmful substances in the tail gas is low, and no additional waste disposal costs are required. The exhaust gas treatment capacity is stronger, and the operation is simple and efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A schematic structural diagram of a kiln fume treatment system in one or more embodiments of the present application is shown.

[0031] Figure 2 Shows Figure 1 Schematic diagram of the internal structure of the reaction device.

[0032] Figure 3 Shows Figure 1 Schematic diagram of the catalyst placement structure.

[0033] Explanation of the reference numerals: 100 - kiln flue gas treatment system, 110 - flue gas exhaust pipe, 111 - opening, 120 - drug injection device, 121 - drug storage box, 122 - drug injection pipe, 123 - drug injection pump, 130 - reaction device, 131 - reaction tank, 132 - support member, 133 - catalyst, 140 - gas output device, 150 - temperature sensor. DETAILED DESCRIPTION

[0034] In order to make the technical personnel in the technical field to which the present application belongs to understand the present application more clearly, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0035] See also Figure 1 , Figure 2 and Figure 3 As shown, in the first aspect of the embodiment of the present application, a kiln flue gas treatment system 100 is provided, including a flue gas exhaust pipe 110, a reagent injection device 120, a reaction device 130 and a gas output device 140, the flue gas exhaust pipe 110 is provided with an opening 111 for connecting with the flue gas outlet of the kiln; the reagent injection device 120 is connected with the opening 111 and injects the reagent into the flue gas exhaust pipe 110; the reaction device 130 includes a reaction tank 131 and more than one layer of support members 132 provided on the reaction tank 131 and a plurality of catalysts 133 provided on the support members 132, the catalyst 133 is used to catalyze the reaction between the flue gas and the reagent to generate ionized sparks and form exhaust gas, the reaction tank 131 is provided with an inlet and an outlet, the inlet of the reaction tank 131 is connected with the flue gas exhaust pipe 110; the gas output device 140 is connected with the outlet of the reaction tank 131 to discharge the exhaust gas.

[0036] The flue gas exhaust pipe 110 leads out the exhaust gas generated by the kiln, and the exhaust gas is mainly nitrogen oxides. The present application can directly open an opening 111 on the flue gas exhaust pipe 110 for injecting reagents. Since the temperature of the exhaust gas discharged from the kiln through the flue gas exhaust pipe 110 is about 130°C to 200°C, the reagent is injected into the flue gas exhaust pipe 110, which can react with the flue gas for reduction, and then the flue gas is catalytically reduced under the action of the catalyst 133, and finally ionization sparks are generated to burn the flue gas.

[0037] like Figure 1 As shown, in some embodiments, in order to increase the contact area between smoke and the agent, the opening 111 in the smoke exhaust pipe 110 is located close to the smoke outlet of the device.

[0038] like Figure 2 As shown, in some implementations, the support member 132 of the reaction tank 131 and the plurality of catalysts 133 arranged on the support member 132 may be provided with one layer, or may be provided with two layers, three layers or four layers. The flue gas carrying the agent undergoes a catalytic reaction through the multi-layer catalyst 133, and then undergoes ionization combustion. The agent may be urea, which decomposes to produce ammonia during operation, and then produces nitrogen and water through combustion. That is, the agent can be decomposed into nitrogen and water, which is safe and pollution-free, and does not require additional treatment of the agent, thereby saving costs, and being safe and environmentally friendly.

[0039] In some embodiments, the flue gas and the reagent react in the reaction tank 131 to generate ionized sparks, and the temperature generated by the combustion of the mixed gas is 300°C to 400°C. This temperature is the temperature of the mixed gas after the oxidation-reduction reaction generates ionized sparks and burns. No additional heating is required. At this temperature, the ammonia generated in the reagent and other mixed gases can be oxidized and burned for discharge without the need for additional treatment of the reagent.

[0040] like Figure 2 and Figure 3 As shown, in some embodiments, the support member 132 is a metal mesh, and the aperture of the metal mesh is 3cm to 10cm; the support member 132 may include a plate body, and the plate body is formed by a plurality of staggered metal strips, and the mesh aperture of the metal mesh formed by the plurality of staggered metal strips is 3cm to 10cm, which may be 3cm, 4cm, 5cm, 6cm, 8cm or 10cm. In some embodiments, the end of the support member 132 is connected to the inner wall of the reaction tank 131, and the connection may be made by welding. The catalyst 133 is placed on the support member 132. On the one hand, the support member 132 serves the purpose of supporting the catalyst 133, and on the other hand, impurities such as iron sheets generated during the catalytic reduction reaction of flue gas can be blocked by the support member 132 to avoid clogging the reaction tank 131.

[0041] like Figure 2 and Figure 3 As shown, in some embodiments, the catalyst 133 is in a honeycomb, strip or block shape, and the pore size of the catalyst 133 is 0.2 cm to 1.5 cm. The pore size of the catalyst 133 is 0.2 cm, 0.5 cm, 0.7 cm, 0.9 cm, 1.2 cm or 1.5 cm, ensuring that the flue gas and the reagent can fully contact the catalyst 133, ensuring a certain contact area, and improving the catalytic reaction efficiency.

[0042] like Figure 2 and Figure 3 As shown, in some embodiments, the size of each catalyst 133 is larger than the aperture of the support member 132, that is, the support member 132 is able to support the catalyst 133. In some embodiments, the cross section of the catalyst 133 is rectangular, the catalyst 133 is honeycomb-shaped, the catalyst 133 can be spread horizontally piece by piece, and a plurality of catalysts 133 can be laid to form an entire horizontal plane, ensuring that the flue gas and the reagent can fully contact the catalyst 133.

[0043] like Figure 2 and Figure 3 As shown, in some embodiments, the mesh of the metal mesh of the support member 132 may be rectangular, circular, arc-shaped or diamond-shaped. Here, the shape of the mesh of the support member 132 is not particularly limited.

[0044] like Figure 2 and Figure 3 As shown, in some embodiments, the support member 132 has a horizontal projection component in the reaction tank 131, that is, it can ensure that the flue gas enters from the upper inlet of the reaction tank 131, and then is catalyzed by the catalyst 133 of the reaction tank 131, and then discharged from the lower outlet of the reaction tank 131.

[0045] In some embodiments, the catalyst 133 contains at least one of titanium, potash, rhodium or palladium. Titanium, potash, rhodium or palladium can be coated on the surface and holes of honeycomb bricks. The metal ions of titanium, potash, rhodium or palladium alloy coatings are used, and multiple metal ions form positive and negative electrodes. The high-temperature mixed gas in the reaction tank passes through the ionization layer, and ionization is generated under the influence of temperature. The higher the temperature, the stronger the ionization. Aluminum oxide generates hydrogen from hydrogen ions, and hydrogen and mixed gases such as ammonia are mixed together and burned. The catalyst 133 of the present application contains at least one of titanium, potash, rhodium or palladium, which can catalyze the flue gas with the agent and then ionize and burn. Urea decomposes during operation to produce ammonia, and then produces nitrogen and water through combustion, that is, the agent can be decomposed into nitrogen and water, which is safe and pollution-free, and does not require additional treatment of the agent, saving costs, and is safe and environmentally friendly.

[0046] In some embodiments, the catalyst 133 is composed of the following components in mass fraction: titanium: 1.0% to 9.0%, potash: 1.0% to 9.0%, rhodium: 1.0% to 9.0%, palladium: 1.0% to 9.0%, aluminum oxide: 10% to 15%, and the rest is iron and unavoidable impurities. Titanium, potash, rhodium or palladium is added to the catalyst 133, and these components are coated on the surface and holes of the honeycomb bricks. The metal ions of the titanium, potash, rhodium or palladium alloy coating are used, and multiple metal ions form positive and negative electrodes. The high-temperature mixed gas in the reaction tank passes through the ionization layer, and ionization is generated under the influence of temperature. The higher the temperature, the stronger the ionization. Aluminum oxide converts hydrogen ions into hydrogen, and hydrogen is mixed with mixed gases such as ammonia and burns together.

[0047] like Figure 1As shown, in some embodiments, the medicine injection device 120 includes a medicine storage box 121 for storing medicine, a medicine injection pipe 122 connected to both the medicine storage box 121 and the smoke exhaust pipe 110, and a medicine injection pump 123 provided on the medicine injection pipe 122; that is, the medicine in the medicine storage box 121 can be injected into the smoke exhaust pipe 110 for smoke treatment by opening the medicine injection pump 123. In some embodiments, the medicine injection pipe 122 is connected to the opening 111 of the smoke exhaust pipe 110, that is, the medicine in the medicine storage box 121 can be injected into the smoke exhaust pipe 110 through the opening 111 of the smoke exhaust pipe 110 by opening the medicine injection pump 123 for smoke treatment. Since the pressure of the medicine injection pump 123 is relatively large when the medicine needs to be injected into the smoke exhaust pipe 110, the medicine can be injected into the smoke exhaust pipe 110, and the smoke in the smoke exhaust pipe 110 will not flow back to the medicine injection pipe 122.

[0048] In some embodiments, the reagents are urea and ammonia water. After entering the flue gas, urea and ammonia water can decompose to produce ammonia, and then produce nitrogen and water through combustion. That is, the reagents can be decomposed into nitrogen and water, which is safe and pollution-free. There is no need for additional treatment of the reagents, which saves costs and is safe and environmentally friendly.

[0049] like Figure 1 As shown, in some embodiments, the kiln flue gas treatment system 100 also includes a controller and a temperature sensor 150 arranged on the flue gas exhaust pipe 110, and the controller is connected to the temperature sensor 150 and the injection pump 123; that is, the temperature of the flue gas in the flue gas exhaust pipe 110 can be obtained through the temperature sensor 150, and then the opening of the injection pump 123 can be controlled by the controller to ensure that sufficient flue gas is introduced into the flue gas exhaust pipe 110.

[0050] In some embodiments, the controller is configured as follows: when the temperature sensor 150 monitors that the temperature of the flue gas exhaust pipe 110 is lower than 100°C, the opening degree of the injection pump 123 is 0; when the temperature sensor 150 monitors that the temperature of the flue gas exhaust pipe 110 is lower than 100°C, for example: 0°C, 30°C, 50°C, 72°C, 80°C, 90°C or 92°C, it can be judged that the furnace is in a closed state, and there is no need to continue to introduce the agent into the flue gas exhaust pipe 110.

[0051] In other embodiments, when the temperature sensor 150 monitors that the temperature of the flue gas exhaust pipe 110 is 100°C ~ 150°C, the opening of the injection pump 123 is 100%; when the temperature sensor 150 monitors that the temperature of the flue gas exhaust pipe 110 is 100°C ~ 150°C, for example: 100°C, 110°C, 115°C, 120°C, 138°C, 140°C or 150°C, it can be judged that the furnace is in an open state, but the temperature of the flue gas exhaust pipe 110 is low, and the reaction of ammonia and nitrogen oxides is not active at this time, so it is necessary to increase the amount of reagent introduced, and at this time it is necessary to open the injection pump 123 to the maximum to ensure sufficient contact between the reagent and the flue gas.

[0052] In other embodiments, when the temperature sensor 150 monitors that the temperature of the flue gas exhaust pipe 110 is 150°C to 170°C, the opening of the injection pump 123 is 60% to 80%; for example: it is 100°C, 110°C, 115°C, 120°C, 138°C, 140°C or 150°C, then it can be judged that the furnace is in an open state. At this time, the reaction between ammonia and nitrogen oxides is relatively active, so it is necessary to ensure a certain amount of reagent introduction. At this time, the opening of the injection pump 123 needs to be opened to 60% to 80%, which can be 60%, 65%, 70%, 72% or 80% to ensure sufficient contact between the reagent and the flue gas.

[0053] In other embodiments, when the temperature sensor 150 monitors that the temperature of the flue gas exhaust pipe 110 is 170°C to 210°C, the opening of the injection pump 123 is 50% to 60%. For example, if the temperature is 100°C, 110°C, 115°C, 120°C, 138°C, 140°C or 150°C, it can be determined that the furnace is in an open state, at which time the reaction between ammonia and nitrogen oxides is relatively active, so a certain amount of reagent introduction needs to be ensured, and at this time the opening of the injection pump 123 needs to be opened to 50% to 60%, which can be 50%, 52%, 55%, 58% or 60%, to ensure sufficient contact between the reagent and the flue gas.

[0054] In some embodiments, the kiln fume treatment system 100 further includes a waste heat utilization device, which performs heat exchange with the tail gas. The tail gas temperature coming out of the reaction tank 131 is 150°C to 210°C, that is, the tail gas can be heat exchanged with the waste heat utilization device, and the waste heat utilization device can be applied to the air conditioner or boiler of the factory building, and can be heat exchanged with the air conditioner of the factory building in winter, or can be used to heat the boiler.

[0055] The working principle of the kiln flue gas treatment system 100 of the present application is as follows: the flue gas enters the flue gas discharge pipe 110 through the gas outlet of the kiln, and the temperature sensor 150 of the flue gas discharge pipe 110 monitors the temperature of the flue gas discharge pipe 110. If the temperature is 100°C to 150°C, the opening of the injection pump 123 is controlled to be 100%; if the temperature is 150°C to 170°C, the opening of the injection pump 123 is controlled to be 60% to 80%; if the temperature is 150°C to 170°C, the opening of the injection pump 123 is controlled to be 60% to 80%; if the temperature is 150°C to 170°C, the temperature of the flue gas discharge pipe 110 is monitored by the temperature sensor 150 of the flue gas discharge pipe 110. Under the condition, the opening of the injection pump 123 is controlled to be 60% to 80%; urea contacts with flue gas and decomposes into ammonia at high temperature, so the flue gas is mixed with ammonia with reducing agent and enters the reaction tank 131. The flue gas with reducing agent is catalyzed by the catalyst 133 of the reaction tank 131, and then ionized and burned to reduce the nitrogen oxides in the flue gas to nitrogen and water. At the same time, the combustion of ammonia produces ammonia and water, which is safe and pollution-free. There is no need to additionally treat the agent, which saves costs and is safe and environmentally friendly. The tail gas after the reaction is extracted through the gas output device 140. The temperature of the tail gas coming out of the reaction tank 131 is 150℃ to 210℃, that is, the tail gas can be heat exchanged with the waste heat utilization device. The waste heat utilization device can be used for air conditioners or boilers in the factory. In winter, it can be heat exchanged with the air conditioners in the factory, and can also be used to heat the boiler.

[0056] In some embodiments, the gas output device 140 may be a blower, which can transport the tail gas from the flue gas exhaust pipe 110 to the reaction tank 131, and then discharge it through the outlet of the reaction tank 131. In some embodiments, the gas output device 140 also includes a delivery pipe, which is connected to the outlet of the reaction tank 131, and the blower is arranged on the delivery pipe. When the kiln flue gas treatment system 100 needs to be treated, the blower can be turned on to facilitate the timely delivery of gas from the flue gas exhaust pipe 110 to the reaction tank 131.

[0057] The second embodiment of the present application provides a treatment method based on the above-mentioned kiln fume treatment system 100, comprising the following steps:

[0058] Connect the smoke exhaust pipe 110 to the smoke outlet of the kiln;

[0059] In other words, the kiln can be an annular open kiln, and the combustion medium is air and natural gas. The bottom of the heating furnace body is equipped with a rotating device for feeding and discharging materials and rotating. The smoke outlet of the kiln is connected to the smoke exhaust pipe 110.

[0060] The agent is injected into the smoke exhaust pipe 110 through the opening 111 by the agent injection device 120;

[0061] In other words, if the temperature is 100℃~150℃, the opening of the injection pump 123 is controlled to be 100%; if the temperature is 150℃~170℃, the opening of the injection pump 123 is controlled to be 60%~80%; if the temperature is 150℃~170℃, the opening of the injection pump 123 is controlled to be 60%~80%; when urea contacts with flue gas, urea can be decomposed into ammonia by high temperature, so the flue gas is mixed with reducing agent.

[0062] The reagent and the flue gas undergo oxidation-reduction reaction in the reaction tank 131 via the catalyst 133 to generate ionization sparks and burn the flue gas to generate tail gas;

[0063] In other words, the reaction of the reagent and the flue gas on the catalyst 133 generates ionization sparks without the need for additional heating. At this temperature, the ammonia produced by the decomposition of urea can be oxidized and burned to produce nitrogen and water without the need for additional treatment of the reagent.

[0064] The tail gas is discharged through the gas output device 140 .

[0065] The tail gas after the reaction is extracted through the gas output device 140.

[0066] In order to reuse the heat of the exhaust gas, the exhaust gas is discharged to the waste heat utilization device through the gas output device 140, so that the waste heat utilization device can exchange heat with the exhaust gas. The temperature of the exhaust gas coming out of the reaction tank 131 is 150°C~210°C, that is, the exhaust gas can be heat exchanged with the waste heat utilization device. The waste heat utilization device can be used in the air conditioner or boiler of the factory building. In winter, it can exchange heat with the air conditioner of the factory building, and can also be used to heat the boiler.

[0067] Through the above embodiments, the present application has the following beneficial effects or advantages:

[0068] 1) The present application uses reagents and catalysts 133 to catalytically reduce the flue gas, and finally reprocesses it with weak sparks. The flue gas treatment efficiency is higher, the space occupied is smaller, the one-time investment is small, and the operation and maintenance costs are lower.

[0069] 2) Compared with traditional removal methods such as water spraying and denitrification agents, this application has higher treatment efficiency, is less likely to clog equipment during operation, produces less waste, and is more economical. The agent is urea, which decomposes into ammonia during operation, produces nitrogen and water after combustion, produces less toxic and harmful substances, and does not require additional waste disposal, reducing costs.

[0070] 3) The waste gas treatment capability of this application is strong, and the operation is simple and efficient. It goes through three stages: reduction, catalysis, and ionization combustion.

[0071] 4) The application scenarios of the present application are flexible and varied, and the entire kiln flue gas treatment system 100 occupies a smaller space and can be installed indoors.

[0072] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0073] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise" and "counterclockwise" indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0074] In this application, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0075] In addition, the descriptions of "first", "second", etc. in this application are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0076] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A kiln fume treatment system, characterized in that: include: a flue gas discharge pipe, provided with an opening for communicating with the flue gas outlet of the kiln; A medicine injection device, connected to the opening and injecting the medicine into the smoke exhaust pipe; A reaction device, comprising a reaction tank, one or more layers of support members arranged on the reaction tank, and a plurality of catalysts arranged on the support members, wherein the catalyst is used to catalyze the reaction between the flue gas and the reagent to generate ionized sparks and form tail gas, and the reaction tank is provided with an inlet and an outlet, and the inlet of the reaction tank is connected to the flue gas exhaust pipe; A gas output device is connected to the outlet of the reaction tank to discharge the tail gas.

2. The kiln fume treatment system according to claim 1, characterized in that: The support member is a metal mesh, and the pore size of the metal mesh is 3 cm to 10 cm; The catalyst is in a honeycomb, strip or block shape, and the pore size of the catalyst is 0.2 cm to 1.5 cm.

3. The kiln fume treatment system according to claim 2, characterized in that: The size of each of the catalysts is larger than the pore size of the support.

4. The kiln fume treatment system according to any one of claims 1 to 3, characterized in that: More than one layer of support members has a horizontal projection component in the reaction tank.

5. The kiln fume treatment system according to any one of claims 1 to 3, characterized in that: The catalyst contains at least one of titanium, palladium, rhodium or palladium.

6. The kiln fume treatment system according to any one of claims 1 to 3, characterized in that: The catalyst is composed of the following components in mass fractions: titanium: 1.0% to 9.0%, mortar: 1.0% to 9.0%, rhodium: 1.0% to 9.0%, palladium: 1.0% to 9.0%, aluminum oxide: 10% to 15%, and the rest is iron and inevitable impurities.

7. The kiln fume treatment system according to any one of claims 1 to 3, characterized in that: The medicine injection device comprises a medicine storage box for storing medicine, a medicine injection pipe connected to the medicine storage box and the smoke exhaust pipe, and a medicine injection pump provided on the medicine injection pipe; The agent is urea or ammonia water.

8. The kiln fume treatment system according to claim 7, characterized in that: The kiln fume treatment system further includes a controller and a temperature sensor provided on the fume exhaust pipe, wherein the controller is connected to the temperature sensor and the drug injection pump; The controller is configured as follows: When the temperature sensor detects that the temperature of the flue gas exhaust pipe is lower than 100° C., the opening degree of the injection pump is 0; When the temperature sensor detects that the temperature of the flue gas exhaust pipe is 100° C. to 150° C., the opening degree of the injection pump is 100%; When the temperature sensor detects that the temperature of the flue gas exhaust pipe is 150°C to 170°C, the opening degree of the injection pump is 60% to 80%; When the temperature sensor monitors that the temperature of the flue gas exhaust pipe is 170° C. to 210° C., the opening degree of the injection pump is 50% to 60%.

9. The kiln fume treatment system according to any one of claims 1 to 3, characterized in that: The kiln flue gas treatment system also includes a waste heat utilization device, which performs heat exchange with the exhaust gas.

10. A treatment method based on the kiln fume treatment system according to any one of claims 1 to 9, characterized in that: The steps include: Connecting the smoke exhaust pipe to the smoke outlet of the kiln; Injecting the agent into the flue gas discharge pipe through the opening by means of an agent injection device; The reagent and the flue gas undergo an oxidation-reduction reaction in the reaction tank via the catalyst to generate ionization sparks and form tail gas; The tail gas is discharged through the gas output device.

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