Waste incineration flue gas purification system
By combining a temperature interaction device with a cyclone separator and spray guns, the problem of poor dust removal effect caused by temperature mismatch in boiler flue gas was solved, achieving efficient and energy-saving flue gas purification and meeting environmental protection requirements.
Patent Information
- Application Number
- CN202423173797.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-23
- Publication Date
- 2025-12-19
- Estimated Expiration
- 2034-12-23
AI Technical Summary
In existing technologies, boiler flue gas needs to be cooled when it enters the semi-dry deacidification reaction tower, resulting in a lower temperature of the boiler flue gas after deacidification. This increases dust adhesion, leading to problems such as filter bag clogging and poor dust removal efficiency in baghouse dust collectors.
A temperature interaction device is adopted, which is set up in a cross-connection with the flue gas inlet pipe through a heat interaction pipe to achieve self-cooling of boiler flue gas and self-heating of flue gas after acid removal. Combined with a cyclone separator and a three-fluid spray gun, the flue gas is pre-cooled and reheated. The cyclone separator separates particulate matter and unreacted acid removal agent, and the three-fluid spray gun performs efficient cooling and acid removal treatment. A wet acid removal tower and an SCR reactor are added at the outlet of the bag filter for deep acid removal and denitrification.
It improves the deacidification and dust removal effects, reduces energy consumption, extends the service life of filter bags, and achieves high efficiency, energy saving and environmental protection of the system, meeting increasingly stringent environmental protection requirements.
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Figure CN223691077U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of flue gas treatment, in particular to a waste incineration flue gas purification system. BACKGROUND
[0002] Waste incineration, as an efficient waste disposal method, has significant advantages in reducing waste volume and recycling heat energy. However, the flue gas generated during waste incineration contains various harmful substances, such as acid gases, heavy metals and dioxins, which need to be strictly purified before being discharged.
[0003] In related technical means, semi-dry deacidification technology and bag dust removal technology are used to control the emission of acid gases and particulate matters in industrial flue gas. The semi-dry deacidification reaction tower uses limestone or other alkaline substances to react with the acid components in the flue gas, effectively removing SO2 and other acid gases. Subsequently, the bag dust collector captures fine particulate matters through filter bags, further cleaning the flue gas. This processing method not only improves the cleanliness of the flue gas, but also reduces environmental pollution.
[0004] For the above technical solution, although semi-dry deacidification and bag dust removal can achieve efficient flue gas purification, when the boiler flue gas enters the semi-dry deacidification reaction tower, the boiler flue gas is relatively high in temperature, and cooling liquid is needed to cool the boiler flue gas to improve the reaction efficiency. After deacidification in the semi-dry deacidification reaction tower, the deacidified boiler flue gas is relatively low in temperature when entering the bag dust collector, which increases the adhesion of dust in the deacidified boiler flue gas, and the dust is more likely to adhere to the surface of the filter bag, causing blockage and reduced permeability of the filter bag of the bag dust collector, resulting in poor dust removal effect of the bag dust collector on the deacidified boiler flue gas. CONTENT OF THE UTILITY MODEL
[0005] In order to improve the problem that when the boiler flue gas enters the semi-dry deacidification reaction tower, cooling liquid is needed to cool the boiler flue gas, and the deacidified boiler flue gas is relatively low in temperature when entering the bag dust collector, resulting in poor dust removal effect of the bag dust collector on the deacidified boiler flue gas, the present application provides a waste incineration flue gas purification system.
[0006] The waste incineration flue gas purification system provided by the present application comprises a semi-dry deacidification reaction tower body, a temperature interaction device and a bag dust collector body. The temperature interaction device comprises an inlet flue gas pipeline for the inflow of boiler flue gas, which is in communication with the gas inlet of the semi-dry deacidification reaction tower body. The temperature interaction device further comprises a heat exchange pipeline connected between the gas outlet of the semi-dry deacidification reaction tower body and the bag dust collector body. The heat exchange pipeline and the inlet flue gas pipeline are cross-connected and not in communication.
[0007] As a preferred solution, a cyclone separator is arranged between the gas outlet of the semi-dry deacidification reaction tower body and the heat exchange pipeline, and is used to separate particulate matters and unreacted deacidification agent in the flue gas.
[0008] As a preferred solution, a circulating tank is arranged between the cyclone separator and the semi-dry deacidification reaction tower body.
[0009] As a preferred solution, the cyclone separator comprises a cyclone connecting port, a first outlet and a second outlet; the cyclone connecting port of the cyclone separator is in communication with the gas outlet of the semi-dry deacidification reaction tower body, the first outlet is in communication with the heat exchange pipeline, the second outlet is in communication with the inlet of the circulating tank, and the outlet of the circulating tank is in communication with the semi-dry deacidification reaction tower body.
[0010] As a preferred solution, a three-fluid spray gun is arranged on the semi-dry deacidification reaction tower body; the three-fluid spray gun is used to spray mixed fluid of water, deacidification agent and air into the semi-dry deacidification reaction tower body.
[0011] As a preferred solution, the three-fluid spray gun comprises a first connecting port, a second connecting port, a third connecting port and a spray port; the first connecting port is connected with a water tank; the second connecting port is connected with a deacidification agent storage tank; the third connecting port is connected with a compressed air storage tank; and the spray port is arranged on the semi-dry deacidification reaction tower body and is used to cool and deacidify the boiler flue gas entering the semi-dry deacidification reaction tower body.
[0012] As a preferred solution, a first water pump is arranged between the first connecting port and the water tank, the inlet end of the first water pump is connected with the water tank, and the outlet end of the first water pump is connected with the first connecting port; a second water pump is arranged between the second connecting port and the deacidification agent storage tank, the inlet end of the second water pump is connected with the deacidification agent storage tank, and the outlet end of the second water pump is connected with the second connecting port.
[0013] As a preferred solution, a wet deacidification tower is connected to the outlet of the bag-type dust collector body, and the wet deacidification tower is used to perform secondary deacidification on the boiler flue gas.
[0014] As a preferred solution, an SCR reactor is connected to the outlet of the bag-type dust collector body, and the SCR reactor is used to perform denitration on the boiler flue gas.
[0015] As a preferred solution, the temperature exchange device is a flue gas heat exchanger.
[0016] Compared with the prior art, the application has the following beneficial effects: temperature recycling and good dust removal effect. The heat exchange pipeline of the temperature interaction device is not connected and crosses the flue gas pipeline, realizing self-cooling of the boiler flue gas and self-heating of the flue gas after acid removal, without additional cooling liquid or heating equipment, thereby saving energy and improving the overall efficiency of the system; the cooled boiler flue gas is more conducive to the acid removal effect of the semi-dry acid removal reaction tower body, the heated acid-removed flue gas reduces the adhesion of dust on the filter bag of the bag-type dust collector body, improves the dust removal effect, prolongs the service life of the filter bag, and improves the problem that when the boiler flue gas enters the semi-dry acid removal reaction tower, the boiler flue gas needs to be cooled by a cooling liquid, and the acid-removed boiler flue gas has a low temperature when entering the bag-type dust collector, resulting in poor dust removal effect of the bag-type dust collector on the acid-removed boiler flue gas. BRIEF DESCRIPTION OF DRAWINGS
[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, a brief introduction will be given to the drawings needed in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative labor on the basis of these drawings.
[0018] The structures, proportions, sizes, etc. shown in the drawings of the present specification are only used to cooperate with the content disclosed in the specification, to enable those skilled in the art to understand and read, and are not used to limit the implementation conditions of the present application, so they do not have technical significance. Any modification of structure, change of proportion relationship or adjustment of size, without affecting the effects and purposes that can be achieved by the present application, should still fall within the scope of the technical content disclosed by the present application.
[0019] Figure 1 Fig. 1 is a schematic diagram of the overall structure of a garbage incineration flue gas purification system according to an embodiment of the present application.
[0020] Explanation of reference signs:
[0021] 10, semi-dry acid removal reaction tower body; 20, temperature interaction device; 21, flue gas pipeline; 22, heat exchange pipeline; 30, bag-type dust collector body; 40, cyclone separator; 41, cyclone connection port; 42, first outlet; 43, second outlet; 50, circulating tank; 60, three-fluid spray gun; 61, first connection port; 62, second connection port; 63, third connection port; 64, spray port; 65, first water pump; 66, second water pump; 70, water tank; 80, acid-removing agent storage tank; 90, compressed air storage tank; 100, wet-process acid removal tower; 110, SCR reactor. DETAILED DESCRIPTION
[0022] In order to make the utility model of the utility model purpose, characteristics, advantages can be more obvious and easy to understand, below will combine the drawings in the embodiments of the utility model, the technical scheme in the embodiments of the utility model is clearly and completely described, obviously, the following described embodiments are only a part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the ordinary skill in the art without creative labor belong to the scope of the utility model protection.
[0023] In the description of the utility model, it is understood that the terms "upper", "lower", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the utility model. It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to the other component or there can be a component disposed therebetween.
[0024] The technical scheme of the utility model will be further illustrated below by specific embodiments in conjunction with the drawings.
[0025] In some embodiments, as shown in Figure 1 The present application provides a kind of garbage incineration flue gas purification system, including semi-dry deacidification reaction tower body 10, temperature interaction device 20 and bag filter body 30;Temperature interaction device 20 includes the smoke gas pipeline 21 for inflow boiler flue gas, and the smoke gas pipeline 21 is communicated with the gas inlet of semi-dry deacidification reaction tower body 10;Temperature interaction device 20 further includes the heat exchange pipeline 22 that is communicated between the gas outlet of semi-dry deacidification reaction tower body 10 and bag filter body 30;Wherein, heat exchange pipeline 22 and smoke gas pipeline 21 cross arrangement and do not communicate.
[0026] When boiler flue gas pipeline has boiler flue gas inflow temperature interaction device 20's smoke gas pipeline 21, boiler flue gas heats heat exchange pipeline 22, at this time, boiler flue gas is endothermic and is cooled, and the boiler flue gas after cooling enters semi-dry deacidification reaction tower body 10, and semi-dry deacidification reaction tower body 10 is deacidified to the boiler flue gas after cooling, and the boiler flue gas after deacidification flows through heat exchange pipeline 22 to realize heating, and inflow bag filter body 30.
[0027] By utilizing high-temperature boiler flue gas to heat heat exchange pipeline 22, the cooling of boiler flue gas and the heating of flue gas after deacidification are realized, the heat exchange and utilization inside the system are realized, the energy utilization efficiency is improved, and the deacidification and dust removal effect are improved.
[0028] In some embodiments, by setting the flue gas inlet pipe 21 and the heat exchange pipe 22 of the temperature interaction device 20, the pre-cooling of the boiler flue gas and the reheating of the flue gas after acid removal are achieved. On the one hand, the high-temperature boiler flue gas is pre-cooled before entering the semi-dry acid removal reaction tower, which improves the acid removal reaction efficiency and reduces the amount of cooling liquid used; on the other hand, the low-temperature flue gas after acid removal is reheated before entering the bag-type dust collector, which reduces the adhesion of dust and improves the dust removal effect and service life of the bag-type dust collector. In addition, the system avoids additional heating equipment through internal heat exchange, saving energy consumption. The entire system realizes reasonable regulation and control of flue gas temperature, improves the acid removal and dust removal efficiency, and achieves the purpose of energy saving and environmental protection. Not only solves the problems existing in the traditional technology, but also improves the performance and economy of the entire waste incineration flue gas purification system. When the boiler flue gas enters the semi-dry acid removal reaction tower, the cooling liquid is needed to cool the boiler flue gas, and the boiler flue gas after acid removal has a low temperature when entering the bag-type dust collector, which leads to poor dust removal effect of the bag-type dust collector on the boiler flue gas after acid removal.
[0029] In some embodiments, as shown in Figure 1 A cyclone separator 40 and a circulation tank 50 are arranged between the gas outlet of the semi-dry acid removal reaction tower body 10 and the heat exchange pipe 22, the cyclone separator 40 includes a cyclone connection port 41, a first outlet 42, and a second outlet 43; the cyclone connection port 41 of the cyclone separator 40 is communicated with the gas outlet of the semi-dry acid removal reaction tower body 10, the first outlet 42 is communicated with the heat exchange pipe 22, and the second outlet 43 is communicated with the inlet of the circulation tank 50; the outlet of the circulation tank 50 is communicated with the semi-dry acid removal reaction tower body 10; wherein the temperature interaction device 20 is preferably a flue gas heat exchanger.
[0030] By setting the cyclone separator 40 and the circulation tank 50, efficient separation and recycling of the semi-dry acid removal reaction tower outlet flue gas are achieved. The cyclone separator 40 utilizes the principle of centrifugal force to separate particulate matter and incomplete acid removal agent in the flue gas, and the gas enters the heat exchange pipe 22 from the first outlet 42, while the separated particulate matter and acid removal agent enter the circulation tank 50 from the second outlet 43 and return to the semi-dry acid removal reaction tower body 10, improving the utilization rate of the acid removal agent and the acid removal efficiency.
[0031] As shown in Figure 1As shown, a three-fluid spray gun 60, a water tank 70, a deacidifying agent storage tank 80, and a compressed air storage tank 90 are arranged between the semi-dry deacidification reaction tower body 10 and the temperature interaction device 20, the three-fluid spray gun 60 comprising a first connecting port 61, a second connecting port 62, a third connecting port 63, and a spraying port 64; the first connecting port 61 is connected with the water tank 70, and a first water pump 65 is arranged between the first connecting port 61 and the water tank 70, with the inlet end of the first water pump 65 connected with the water tank 70 and the outlet end of the first water pump 65 connected with the first connecting port 61.
[0032] By arranging the three-fluid spray gun 60 and the matching equipment, efficient cooling and deacidification of the flue gas entering the semi-dry deacidification reaction tower are realized. The first water pump 65 delivers water in the water tank 70 to the first connecting port 61 of the three-fluid spray gun 60 to provide the water source required for atomization, ensuring that the spray gun can generate fine enough liquid droplets, increasing the contact area with the flue gas, and improving the cooling and deacidification effect.
[0033] The second connecting port 62 is connected with the deacidifying agent storage tank 80, and a second water pump 66 is arranged between the second connecting port 62 and the deacidifying agent storage tank 80, with the inlet end of the second water pump 66 connected with the deacidifying agent storage tank 80 and the outlet end of the second water pump 66 connected with the second connecting port 62.
[0034] By arranging the second water pump 66 and the deacidifying agent storage tank 80, the quantitative delivery and accurate control of the deacidifying agent are realized. The second water pump 66 delivers the deacidifying agent in the deacidifying agent storage tank 80 to the second connecting port 62 of the three-fluid spray gun 60, ensuring that the spray gun can continuously and stably spray the deacidifying agent, ensuring the smooth progress of the deacidification reaction and improving the deacidification efficiency.
[0035] The third connecting port 63 is connected with the compressed air storage tank 90, and the spraying port 64 is arranged between the semi-dry deacidification reaction tower body 10 and the temperature interaction device 20, and is used for cooling and deacidifying the boiler flue gas entering the semi-dry deacidification reaction tower body 10.
[0036] By connecting the compressed air storage tank 90 with the third connecting port 63 of the three-fluid spray gun 60, efficient atomization and uniform distribution of water and deacidifying agent are realized. The compressed air provides sufficient power to enable the spray gun to fully atomize water and deacidifying agent, forming fine liquid droplets, increasing the contact area with the flue gas, and improving the cooling and deacidification effect. The reasonable arrangement of the spraying port 64 ensures that the atomized liquid droplets can fully contact the boiler flue gas entering the semi-dry deacidification reaction tower body 10, realizing efficient cooling and deacidification.
[0037] As shown in Figure 1 A wet deacidification tower 100 is connected to the outlet of the bag-type dust collector body 30, and the wet deacidification tower 100 is used for secondary deacidification of the boiler flue gas.
[0038] By adding a wet deacidification tower 100 at the outlet of the bag filter, deep deacidification treatment of the flue gas is realized. The wet deacidification tower 100 utilizes liquid absorbent to fully contact and react with acidic substances in the flue gas, further removes the residual acidic substances after semi-dry deacidification, improves the overall deacidification efficiency, and ensures that the discharged flue gas meets more stringent environmental protection standards.
[0039] The SCR reactor 110 is connected to the outlet of the bag filter body 30, and is used for denitrification of the boiler flue gas.
[0040] By adding the SCR reactor 110 at the outlet of the bag filter, efficient removal of nitrogen oxides in the flue gas is realized. The SCR reactor 110 utilizes selective catalytic reduction technology to react reducing agent (such as ammonia or urea) with nitrogen oxides in the flue gas under the action of a catalyst to generate harmless nitrogen and water, effectively reducing the content of nitrogen oxides in the flue gas, and further improving the environmental protection effect of flue gas treatment.
[0041] In some embodiments, by setting the cyclone separator 40 and the circulating tank 50, efficient recovery and utilization of deacidification agent is realized; by using the three-fluid spray gun 60 system, combined with the water tank 70, the deacidification agent storage tank 80 and the compressed air storage tank 90, accurate and efficient cooling and deacidification treatment of the flue gas entering the semi-dry deacidification reaction tower is realized; by adding the wet deacidification tower 100 and the SCR reactor 110 at the outlet of the bag filter, deep deacidification and denitrification treatment of the flue gas is realized. This multi-stage combined flue gas treatment system not only improves the deacidification efficiency and deacidification agent utilization rate, but also realizes the collaborative management of various pollutants in the flue gas. The system has the advantages of high treatment efficiency, stable operation and strong adaptability, and can meet the increasingly stringent environmental protection requirements, providing an efficient and reliable solution for clean discharge of industrial boiler flue gas.
[0042] The above-described embodiments are merely used to illustrate the technical solutions of the present application, rather than limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacements for some technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.
Claims
1. A waste incineration flue gas purification system comprising a semi-dry deacidification reaction tower body (10) and a bag-type dust collector body (30), characterized by: Further comprising a temperature interaction device (20); The temperature interaction device (20) comprises a flue gas inlet pipe (21) for the flue gas flowing into the boiler, and the flue gas inlet pipe (21) is communicated with the gas inlet of the semi-dry deacidification reaction tower body (10); The temperature interaction device (20) further comprises a heat exchange pipe (22) communicated between the gas outlet of the semi-dry deacidification reaction tower body (10) and the bag-type dust collector body (30); Wherein, the heat exchange pipe (22) is crosswise arranged with the flue gas inlet pipe (21) and is not communicated.
2. The waste incineration flue gas cleaning system according to claim 1, characterized in that, A cyclone separator (40) is arranged between the gas outlet of the semi-dry deacidification reaction tower body (10) and the heat exchange pipe (22), and the cyclone separator (40) is used for separating the particulate matters and the incompletely reacted deacidification agent in the flue gas.
3. The waste incineration flue gas cleaning system according to claim 2, characterized in that, A circulating tank (50) is arranged between the cyclone separator (40) and the semi-dry deacidification reaction tower body (10).
4. The waste incineration flue gas cleaning system according to claim 3, characterized in that, The cyclone separator (40) comprises a cyclone connecting port (41), a first outlet (42) and a second outlet (43); The cyclone connecting port (41) of the cyclone separator (40) is communicated with the gas outlet of the semi-dry deacidification reaction tower body (10), the first outlet (42) is communicated with the heat exchange pipe (22), the second outlet (43) is communicated with the inlet of the circulating tank (50), and the outlet of the circulating tank (50) is communicated with the semi-dry deacidification reaction tower body (10).
5. The waste incineration flue gas cleaning system according to claim 1, characterized in that, A three-fluid spray gun (60) is arranged on the semi-dry deacidification reaction tower body (10); the three-fluid spray gun (60) is used for spraying the mixed fluid of water, deacidification agent and air into the semi-dry deacidification reaction tower body (10).
6. The waste incineration flue gas cleaning system according to claim 5, characterized in that, The three-fluid spray gun (60) comprises a first connecting port (61), a second connecting port (62), a third connecting port (63) and a spray port (64); The first connecting port (61) is connected with a water tank (70); The second connecting port (62) is connected with a deacidification agent storage tank (80); The third connecting port (63) is connected with a compressed air storage tank (90); The spray port (64) is arranged on the semi-dry deacidification reaction tower body (10), and is used for cooling and deacidifying the boiler flue gas entering the semi-dry deacidification reaction tower body (10).
7. The waste incineration flue gas cleaning system according to claim 6, characterized in that, A first water pump (65) is arranged between the first connecting port (61) and the water tank (70), the inlet end of the first water pump (65) is connected with the water tank (70), and the outlet end of the first water pump (65) is connected with the first connecting port (61); a second water pump (66) is arranged between the second connecting port (62) and the deacidification agent storage tank (80), the inlet end of the second water pump (66) is connected with the deacidification agent storage tank (80), and the outlet end of the second water pump (66) is connected with the second connecting port (62).
8. The waste incineration flue gas cleaning system according to claim 1, characterized in that, An wet deacidification tower (100) is connected with the outlet of the bag-type dust collector body (30), and the wet deacidification tower (100) is used for secondary deacidification of the boiler flue gas.
9. The waste incineration flue gas cleaning system according to claim 1, characterized in that, The bag-type dust collector body (30) is connected with an SCR reactor (110) for denitration of the boiler flue gas.
10. The waste incineration flue gas cleaning system according to claim 1, characterized in that, The temperature interaction device (20) is a flue gas heat exchanger.