A desulfurization system for reducing the consumption of highly active calcium desulfurizer
By designing a combination of a high-active calcium injection system and a desulfurization reactor in an industrial kiln, combined with a cyclone separator and a bag dust collector, the separation and recycling of powders is realized, and the problem of high-active calcium desulfurization agent is solved, reducing operating costs and improving purification effect.
Patent Information
- Application Number
- CN202421207639.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-30
- Publication Date
- 2025-04-01
- Estimated Expiration
- 2034-05-30
AI Technical Summary
In industrial kilns, the consumption of high-active calcium desulfurizer is large, resulting in high system operation costs and excessive calcium-sulfur ratio affects system operation.
A desulfurization system including a high-active calcium injection system and a desulfurization reactor is designed. Through the combination of a cyclone separator and a bag dust collector, the separation and recycling of powders are realized, and the use of high-active calcium desulfurization agent is reduced.
Through the recycling of powder, the use of high-active calcium desulfurization agent is reduced, the operating cost is reduced, and the flue gas purification effect is improved.
Smart Images
Figure CN222694414U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of high-activity calcium-based desulfurization systems, in particular to a desulfurization system that reduces the consumption of high-activity calcium desulfurizers. Background Art
[0002] Industrial kilns are thermal equipment that heat materials or workpieces using heat from fuel combustion or electrical energy conversion in industrial production. Industrial kilns are widely used in industries such as steel, coking, nonferrous metals, building materials, petrochemicals, chemicals, and machinery manufacturing. They play an important supporting role in industrial development, and are also the main source of air pollution in the industrial field.
[0003] More and more industrial flue gas treatments use highly active calcium hydroxide as a desulfurizer, especially in coking flue gas, industrial silicon flue gas and some heating furnace flue gas, making flue gas treatment more and more diverse. However, due to the different components and temperatures of some flue gases, the calcium-sulfur ratio in the desulfurization system is too high, affecting the operating costs of the entire system and making the operating costs relatively high. In order to reduce the calcium-sulfur ratio of the system, we propose a desulfurization system that reduces the consumption of highly active calcium desulfurizer. Utility Model Content
[0004] The utility model provides a desulfurization system for reducing the consumption of a high-activity calcium desulfurization agent, so as to solve the problems raised in the background technology.
[0005] In order to solve the above problems, the utility model provides a desulfurization system for reducing the consumption of high-activity calcium desulfurizer, including a high-activity calcium injection system and a desulfurization reactor. The high-activity calcium injection system is composed of a high-activity calcium storage bin, a jet pump, and a jet blower. The high-activity calcium storage bin stores high-activity calcium desulfurizer, and the discharge port at the lower end is connected to the jet pump through an electronic metering valve, one end of the jet pump is connected to two jet blowers, and the other end is connected to the middle end of a smoke inlet pipe through a pipeline, one end of the smoke inlet pipe is connected to the flue of an external waste heat boiler, and the other end is connected to the inlet end of the desulfurization reactor, the outlet end of the desulfurization reactor is connected to a cyclone separator through a pipeline, the outlet end of the cyclone separator is connected to a bag dust collector through a pipeline, the bottom end of the cyclone separator is provided with a rotary feeding valve, and the rotary feeding valve is connected to the desulfurization reactor through a reflux pipe, the bag dust collector is connected to an induced draft fan through a pipeline, and the induced draft fan is connected to the chimney through a pipeline.
[0006] Preferably, the flue gas flow rate in the desulfurization reactor is 5-8 m / s, and the residence time is 2-3 s.
[0007] Preferably, a denitration reactor is provided between the bag filter and the induced draft fan according to the conditions of the flue gas.
[0008] Preferably, the wind speed in the bag filter is controlled at 0.7-0.9 m / min.
[0009] Preferably, the high-activity calcium storage bin stores dry, white, ready-to-use powdered high-activity calcium desulfurizer, and the powder particle size is 20-30 μm.
[0010] The beneficial effects of adopting the above technical solution are:
[0011] 1. The powder in the flue gas can be separated from the flue gas by setting a cyclone separator, so that 60-80% of the powder is intercepted and sent back to the desulfurization reactor through a rotary feeding valve and a reflux pipe. Since the powder contains incompletely reacted high-activity calcium desulfurizer, the flue gas can be filtered and removed again in the desulfurization reactor. Through repeated recycling, the use of high-activity calcium desulfurizer is reduced, thereby reducing the operating cost.
[0012] 2. The flue gas separated by the cyclone separator enters the bag filter. The separated powder in the flue gas covers the surface of the dust bag. Since the powder contains unused high-activity calcium desulfurizer, it continues to react with the flue gas to remove pollution, thereby improving the purification effect.
[0013] 3. According to the flue gas conditions, a denitrification reactor can be added to further improve the purification effect.
[0014] 4. Reduce the calcium-sulfur ratio of the system through recycling, reduce the amount of final by-products, reduce the disposal costs of subsequent by-products, and thus reduce operating costs BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 It is a schematic diagram of the overall system structure of the utility model.
[0016] Among them: 1-active calcium injection system; 11-high active calcium storage bin; 12-injection pump; 13-injection fan; 14-electronic metering valve; 2-desulfurization reactor; 3-smoke inlet pipe; 4-cyclone separator; 41-rotary feeding valve; 42-reflux pipe; 5-bag dust collector; 6-induced draft fan; 7-chimney; 8-denitrification reactor. DETAILED DESCRIPTION
[0017] The embodiments of the present utility model are described in detail below with reference to the accompanying drawings.
[0018] In the description of the present invention, unless otherwise specified, "multiple" means two or more; the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third" and the like are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.
[0019] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, a movable 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. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0020] like Figure 1 In this embodiment, a desulfurization system for reducing the consumption of high-activity calcium desulfurizer includes a high-activity calcium injection system 1 and a desulfurization reactor 2. The high-activity calcium injection system 1 is composed of a high-activity calcium storage bin 11, an injection pump 12, and an injection fan 13. The high-activity calcium storage bin 11 stores high-activity calcium desulfurizer, and the discharge port at the lower end is connected to the injection pump 12 through an electronic metering valve 14. One end of the injection pump 12 is connected to two injection fans 13, and the other end is connected to the middle end of a smoke inlet pipe 3 through a pipeline. One end of the smoke inlet pipe 3 is connected to the flue of the external waste heat boiler, and the other end is connected to the inlet end of the desulfurization reactor 2. The outlet end of the desulfurization reactor 2 is connected to the cyclone separator 4 through a pipe, and the outlet end of the cyclone separator 4 is connected to the bag dust collector 5 through a pipe. The bottom end of the cyclone separator 4 is provided with a rotary feeding valve 41, and the rotary feeding valve 41 is connected to the desulfurization reactor 2 through a reflux pipe 42. The bag dust collector 5 is connected to an induced draft fan 6 through a pipe, and the induced draft fan 6 is connected to a chimney 7 through a pipe.
[0021] Through the above technical scheme, when in use, the smoke inlet pipe 3 is connected to the flue of the external waste heat boiler, so that the polluted flue gas enters the smoke inlet pipe 3, and the synchronous high-activity calcium injection system 1 works, and the high-activity calcium desulfurizer stored in the high-activity calcium storage bin 11 is metered through the electronic metering valve 14 and sent to the injection pump 12. The high-activity calcium desulfurizer is sent into the smoke inlet pipe 3 through the injection fan 13 and the injection pump 12. As the flue gas flows, the high-activity calcium desulfurizer is mixed with the flue gas, and then uniformly introduced into the desulfurization reactor 2 for decontamination and purification. The flue gas after decontamination and purification by the desulfurization reactor 2 will contain powdery matter. The powdery matter enters the cyclone separator 4 through the pipe along with the flue gas, and the powdery matter in the flue gas is separated by the cyclone separator 4. 60-80% of the separated powder is retained, and then the flue gas containing a small amount of powder enters the bag-type dust collector 5. The separated and retained powder is refluxed to the desulfurization reactor 2 through the rotary feeding valve 41 and the reflux pipe 42. Since the powder contains unreacted high-activity calcium desulfurizer, it further reacts with SO2 after entering the desulfurization reactor 2. The flue gas entering the bag-type dust collector 5 contains a small amount of powder. Since the powder contains unreacted high-activity calcium desulfurizer, the powder will cover the outer surface of the bag in the bag-type dust collector 5, and continue to react with SO2 in the flue gas, further reducing the emission concentration. The induced draft fan 6 provides a stable gravitational force to the bag-type dust collector 5, and then the filtered flue gas is sucked out and sent to the chimney 7 for discharge.
[0022] Further explanation: The powder is separated by the cyclone separator 4 and refluxed into the desulfurization reactor 2, so that the unreacted high-activity calcium desulfurizer in the powder continues to react with SO2, so that the high-activity calcium desulfurizer can be recycled and reused, while ensuring pollution removal, reducing the use of high-activity calcium desulfurizer, thereby reducing operating costs.
[0023] Further explanation: The powder is separated and refluxed through the cyclone separator 4, so that the powder in the bag dust collector 5 is reduced, the workload of the bag dust collector 5 is reduced, and the failure rate of the bag dust collector 5 is reduced, thereby extending the service life of the bag dust collector.
[0024] Further explanation: The powder is separated and refluxed through the cyclone separator 4, so that the high-activity calcium desulfurizer that has not completely reacted in the powder can react fully, so that the amount of dust is reduced, and the final product generated by the system is also greatly reduced, effectively reducing the subsequent processing cost of the final product.
[0025] Preferably, the flue gas flow rate in the desulfurization reactor 2 is 5 to 8 m / s, and the residence time is 2 to 3 s.
[0026] Through the above technical solution, it is ensured that the high-activity calcium desulfurizer reacts fully with SO2 in the flue gas in the desulfurization reactor 2, thereby fully reducing the pollutants in the flue gas.
[0027] Preferably, a denitration reactor 8 is provided between the bag filter 5 and the induced draft fan 6 according to the conditions of the flue gas.
[0028] Through the above technical solution, when laying out the system, it can be selected according to actual conditions whether to add a denitrification reactor 8 to reduce the emission of nitrogen oxides (NOx) in the flue gas.
[0029] Preferably, the wind speed in the bag filter 5 is controlled at 0.7-0.9 m / min.
[0030] Through the above technical solution, the wind speed of the dust bag 5 is controlled so that the incompletely reacted high-activity calcium desulfurizer contained in the powder has sufficient reaction time with the SO2 in the flue gas, thereby reducing the emission concentration of the flue gas.
[0031] Preferably, the high-activity calcium desulfurizer stored in the high-activity calcium storage bin 11 is in the form of dry, white, ready-to-use powder, and the powder particle size is 20-30 μm.
[0032] The above technical solution facilitates the high-activity calcium desulfurizer to enter the smoke inlet pipe 3 and mix with the smoke.
[0033] Finally, it should be noted that the above implementation cases are only used to illustrate the present invention, rather than to limit the technical solutions described in the present invention; therefore, although this specification has described the present invention in detail with reference to the above-mentioned embodiments, ordinary technicians in this field should understand that the present invention can still be modified or replaced by equivalents, and all technical solutions and improvements that do not depart from the spirit and scope of the present invention should be included in the scope of the claims of the present invention; technologies not described in detail in the present invention are implemented with existing technologies.
Claims
1. A desulfurization system for reducing the consumption of high-activity calcium desulfurizer, comprising a high-activity calcium injection system and a desulfurization reactor, characterized in that: The high-activity calcium injection system consists of a high-activity calcium storage bin, a jet pump, and a jet blower. The high-activity calcium storage bin stores high-activity calcium desulfurizer, and the discharge port at the lower end is connected to the jet pump through an electronic metering valve. One end of the jet pump is connected to two jet blowers, and the other end is connected to the middle end of a smoke inlet pipe through a pipeline. One end of the smoke inlet pipe is connected to the flue of an external waste heat boiler, and the other end is connected to the inlet end of the desulfurization reactor. The outlet end of the desulfurization reactor is connected to a cyclone separator through a pipeline, and the outlet end of the cyclone separator is connected to a bag dust collector through a pipeline. A rotary feeding valve is provided at the bottom end of the cyclone separator, and the rotary feeding valve is connected to the desulfurization reactor through a reflux pipe. The bag dust collector is connected to an induced draft fan through a pipeline, and the induced draft fan is connected to the chimney through a pipeline.
2. A desulfurization system for reducing the consumption of high-activity calcium desulfurizer according to claim 1, characterized in that: The flue gas flow rate in the desulfurization reactor is 5-8 m / s, and the residence time is 2-3 s.
3. A desulfurization system for reducing the consumption of high-activity calcium desulfurizer according to claim 1, characterized in that: A denitration reactor is provided between the bag filter and the induced draft fan according to the conditions of the flue gas.
4. A desulfurization system for reducing the consumption of high-activity calcium desulfurizer according to claim 1, characterized in that: The wind speed in the bag filter is controlled at 0.7-0.9 m / min.
5. A desulfurization system for reducing the consumption of high-activity calcium desulfurizer according to claim 1, characterized in that: The high-activity calcium storage bin stores dry, white, ready-to-use powdered high-activity calcium desulfurizer, and the powder particle size is 20-30 μm.