Environment-friendly coking flue gas treatment system with ultra-low up-to-standard emission

Abstract

The utility model relates to the technical field of flue gas treatment, and discloses an environment-friendly coking flue gas treatment system with ultralow up-to-standard discharge, which comprises a desulfurizing agent bin, a desulfurizing agent conveying system is arranged below the desulfurizing agent bin, a desulfurizing tower is connected below the desulfurizing agent conveying system, an ammonia spraying grid is mounted on the right side of the desulfurizing tower, and a flue gas outlet is formed in the right side of the desulfurizing tower. The right side of the ammonia spraying grid is connected with a dust-nitrate-sulfur NMHC integrated reactor, the upper end of the ammonia spraying grid is connected with an ammonia water metering gasification system, and a dilution fan is mounted below the ammonia water metering gasification system. According to the environment-friendly coking flue gas treatment system with ultra-low up-to-standard emission, disclosed by the utility model, the up-to-standard and ultra-low emission of particulate matters, SO2 and NOx in flue gas is ensured, and meanwhile, non-methane total hydrocarbons NMHC, NH3 and other acidic pollutants and dioxin can be efficiently removed; the method has the advantages of short process flow, low equipment investment, low operation cost, high treatment efficiency and environment-friendly ultralow standard emission.

Description

Technical Field

[0001] The utility model relates to the technical field of flue gas treatment, in particular to a coking flue gas treatment system with environmental protection and ultra-low emission standards. Background Art

[0002] Characteristics of coking flue gas and current status of flue gas treatment:

[0003] 1. The flue gas temperature varies widely, and the flue gas often contains coke particles with sparks. Therefore, the bags are easily burned or destroyed during treatment, and the catalyst is burned and collapsed, which poses safety and environmental risks and may cause safety accidents.

[0004] 2. High dust content in flue gas: high particle content, large particles, and coarse dust with a particle size greater than 20um; therefore, in the treatment, the catalyst is arranged in 2+1 or 3+1, and one layer of catalyst needs to be replaced every year. In the case of pre-denitration, the catalyst is easily blocked; in the case of post-denitration, the flue gas temperature is low and needs to be heated; in the case of pre-denitration, SO2 is easily converted into ammonium sulfate by reaction with ammonia, and the particles in the flue gas block the waste heat boiler tubes, affecting the heat exchange effect;

[0005] 3. The flue gas contains tar, heavy metal particles and acidic substances; therefore, during treatment, the catalyst is easily poisoned and the catalyst micropores are blocked; carbon deposition on the catalyst leads to fire;

[0006] 4. The NMHC content in flue gas is 120-140 mg / m3; therefore, it is impossible to eliminate the NMHC in flue gas during treatment, and it is difficult for coke ovens with long operation time to meet the flue gas emission standards;

[0007] 5. Use wet desulfurization or SDS dry desulfurization process; therefore, in the treatment process, wet desulfurization produces wastewater, and it is difficult to meet the discharge standards; SDS dry desulfurization technology produces SO2, and the desulfurization ash is water-soluble and difficult to absorb and dispose of;

[0008] Therefore, there is an urgent need for an environmentally friendly coking flue gas treatment system with ultra-low emission standards to solve the above technical problems. Utility Model Content

[0009] The purpose of the utility model is to provide an environmentally friendly and ultra-low emission standard coking flue gas treatment system. To achieve the above purpose, the utility model provides the following technical solutions:

[0010] A coking flue gas treatment system with environmental protection and ultra-low emission compliance comprises a desulfurizer bin, a desulfurizer conveying system is arranged below the desulfurizer bin, and a desulfurization tower is connected below the desulfurizer conveying system, an ammonia spraying grid is installed on the right side of the desulfurization tower, and a dust, nitrate and sulfur (NMHC) integrated reactor is connected to the right side of the ammonia spraying grid, an ammonia water metering gasification system is connected to the upper end of the ammonia spraying grid, and a dilution fan is installed below the ammonia water metering gasification system, a hot blast furnace is arranged on the upper right side of the dust, nitrate and sulfur (NMHC) integrated reactor, and a variable frequency fan is arranged below the hot blast furnace, a waste heat boiler is arranged on the right side of the dust, nitrate and sulfur (NMHC) integrated reactor, a steam drum is arranged above the waste heat boiler, and an induced draft fan is arranged on the right side of the waste heat boiler, and the right side of the ammonia water metering gasification system is connected to an ammonia water tank through an ammonia water metering pump.

[0011] Preferably, an ash outlet is provided at the bottom end of the desulfurization tower to facilitate connection with the ash outlet system; and an air outlet is provided on the top side to facilitate connection with the ammonia injection grid.

[0012] Preferably, an air inlet is provided on the air inlet side of the ammonia injection grid so as to be connected to the oxidation blower, so that clean air can be mixed with the flue gas flowing toward the ammonia injection grid and enter the ammonia injection grid together.

[0013] Preferably, the ammonia spray grid is provided with a pipeline connected to an ammonia water metering gasification system, the ammonia water metering gasification system is connected to a dilution fan and an ammonia water metering pump, the ammonia water metering pump is connected to an ammonia water tank containing ammonia water, the industrial ammonia water in the ammonia water tank is transported to the ammonia water metering gasification system via the ammonia water metering pump, the inflowing industrial ammonia water is diluted and gasified by the dilution fan and the ammonia water metering gasification system, and the diluted gasified ammonia water flows into the ammonia spray grid, and then the ammonia spray grid sprays out diluted ammonia water to treat the flue gas flowing through.

[0014] Preferably, the bottom end of the NMHC integrated reactor is provided with an ash outlet, which is connected to the ash outlet system, and the side end is provided with a pipeline connected to the waste heat boiler.

[0015] Preferably, the waste heat boiler is provided with a steam drum and a deaerator, and the steam drum circulates and exchanges heat with the flue gas containing waste heat.

[0016] Compared with the prior art, the utility model has the following beneficial effects: the system can efficiently remove non-methane total hydrocarbons NMHC, NH3 and other acidic pollutants and dioxins while ensuring ultra-low emission of particulate matter, SO2 and NOx in flue gas; it has the advantages of short process flow, low equipment investment, low operating cost, high treatment efficiency and environmentally friendly ultra-low emission. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0018] Figure 1 This is a schematic diagram of the overall structure of the coking flue gas treatment system with environmental protection and ultra-low emission standards of the utility model;

[0019] In the figure: 1. Desulfurizing agent bin; 2. Desulfurizing agent conveying system; 3. Desulfurizing tower; 4. Dust, nitrate and sulfur (NMHC) integrated reactor; 5. Ammonia spraying grid; 6. Ammonia water metering gasification system; 7. Dilution fan; 8. Hot air furnace; 9. Variable frequency fan; 10. Ammonia water metering pump; 11. Ammonia water tank; 12. Steam drum; 13. Waste heat boiler; 14. Induced draft fan. DETAILED DESCRIPTION

[0020] The present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are only used to explain the relevant utility model, rather than to limit the utility model. It should also be noted that, for ease of description, only the parts related to the utility model are shown in the accompanying drawings. The different types of section lines in the drawings in the embodiments of the utility model are not marked according to the national standard, nor are there any requirements for the materials of the components, but are used to distinguish the cross-sectional views of the components in the drawings.

[0021] See also Figure 1 A coking flue gas treatment system with environmental protection and ultra-low emission standards, comprising a desulfurizer bin 1, a desulfurizer conveying system 2 is arranged below the desulfurizer bin 1, and a desulfurization tower 3 is connected below the desulfurization tower 3, an ammonia spraying grid 5 is installed on the right side of the desulfurization tower 3, and a dust, nitrate and sulfur NMHC integrated reactor 4 is connected to the right side of the ammonia spraying grid 5, an ammonia water metering gasification system 6 is connected to the upper end of the ammonia spraying grid 5, and a dilution fan 7 is installed below the ammonia water metering gasification system 6, a hot blast furnace 8 is arranged on the upper right side of the dust, nitrate and sulfur NMHC integrated reactor 4, and a variable frequency fan 9 is arranged below the hot blast furnace 8, a waste heat boiler 13 is arranged on the right side of the dust, nitrate and sulfur NMHC integrated reactor 4, a steam drum 12 is arranged above the waste heat boiler 13, and an induced draft fan 14 is arranged on the right side of the waste heat boiler 13, and the right side of the ammonia water metering gasification system 6 is connected to an ammonia water tank 11 through an ammonia water metering pump 10.

[0022] Among them, an ash outlet is provided at the bottom end of the desulfurization tower 3 to facilitate the connection with the ash outlet system; and an air outlet is provided at the top side to facilitate the connection with the ammonia injection grid 5.

[0023] An air inlet is provided on the air inlet side of the ammonia injection grid 5 so as to be connected to the oxidation blower, so that clean air can be mixed with the flue gas flowing toward the ammonia injection grid and enter the ammonia injection grid 5 together.

[0024] Among them, a pipeline connected to the ammonia metering gasification system 6 is provided on the ammonia spray grid 5, the ammonia metering gasification system 6 is connected with the dilution fan and the ammonia metering pump 10, the ammonia metering pump 10 is connected with the ammonia tank 11 containing ammonia water, the industrial ammonia water in the ammonia tank 11 is transported to the ammonia metering gasification system 6 through the ammonia metering pump, the dilution fan and the ammonia metering gasification system 6 dilute and gasify the inflowing industrial ammonia water, and the diluted vaporized ammonia water flows into the ammonia spray grid 5, and then the ammonia spray grid 5 sprays out the diluted ammonia water to treat the flue gas flowing through.

[0025] Among them, the bottom end of the dust, nitrate and sulfur NMHC integrated reactor 4 is provided with an ash outlet, which is connected to the ash outlet system, and the side end is provided with a pipeline connected to the waste heat boiler 13.

[0026] The waste heat boiler 13 is provided with a steam drum and a deaerator, and the steam drum circulates and exchanges heat with the flue gas containing waste heat.

[0027] It should be noted that in this environmentally friendly and ultra-low emission coking flue gas treatment system, while the coke oven flue gas enters the desulfurization tower through the booster fan, the high-activity desulfurizer in the desulfurizer bin 1 is input into the desulfurization tower 3 as needed through a conveying pipeline and a dispersion device for desulfurization treatment; an ash outlet is provided at the bottom end of the desulfurization tower 3 to facilitate the connection with the ash outlet system; an air outlet is provided on the top side to communicate with the ammonia injection grid 5.

[0028] Then, the flue gas after desulfurization treatment flows into the ammonia spray grid 5 through the connecting pipe, and the inflowing flue gas is treated by the diluted ammonia water sprayed from the ammonia spray grid 5. An air inlet is provided on the air inlet side of the ammonia spray grid 5 so as to be connected with the oxidation fan, so that clean air can be mixed with the flue gas flowing to the ammonia spray grid 5 and enter the ammonia spray grid 5 together; the ammonia spray grid 5 is provided with a pipeline connected to the ammonia water metering gasification system 6, and the ammonia water metering gasification system 6 is connected with the dilution fan and the ammonia water metering pump 10, and the ammonia water metering pump 10 is connected with the ammonia water tank 11 containing ammonia water, and the industrial ammonia water in the ammonia water tank 11 is transported to the ammonia water metering gasification system through the ammonia water metering pump, and the inflowing industrial ammonia water is diluted and gasified by the dilution fan and the ammonia water metering gasification system 6, and the diluted gasified ammonia water flows into the ammonia spray grid 5, and then the ammonia spray grid 5 sprays the diluted ammonia water to treat the flue gas flowing through;

[0029] Then, the treated flue gas continues to flow into the dust, nitrate and sulfur NMHC integrated reactor 4 through the connecting pipe, and the pollutants of the coking flue gas are removed by reaction in the integrated reactor by the highly active catalyst functional ions immersed in the inner wall of the ceramic fiber catalytic composite filter tube in the dust, nitrate and sulfur NMHC integrated reactor 4. The bottom end of the reactor is provided with an ash outlet, which is connected to the ash outlet system; the side end is provided with a pipeline connected to the waste heat boiler 13;

[0030] Then, the flue gas after the reaction continues to flow into the waste heat boiler 13, and the waste heat boiler 13 recovers heat and deoxidizes the flue gas to obtain clean flue gas; the waste heat boiler 13 is provided with a steam drum 12 and a deaerator, and the steam drum 12 circulates heat exchange with the flue gas containing waste heat to improve the heat energy recovery value, and the deaerator removes oxidation in the flue gas to reduce the corrosion of the flue gas to the pipeline and chimney;

[0031] Finally, the induced draft fan 14 conveys the clean smoke that meets the standards to the chimney through the pipeline, and the chimney is discharged into the atmosphere. At the same time, the ash generated during the desulfurization process and the NMHC integrated reaction process is collected and processed. The by-product is an insoluble salt, which is widely present in nature and can be easily and conveniently processed and widely used in the building materials industry.

[0032] The contents not described in detail in this specification belong to the prior art known to professionals in this field.

[0033] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the utility model involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the concept of the utility model. For example, the above features are replaced with the technical features with similar functions disclosed in the present application (but not limited to) by each other to form a technical solution.

Claims

1. A coking flue gas treatment system with environmental protection and ultra-low emission standards, comprising a desulfurization agent bin (1), characterized in that: A desulfurizing agent conveying system (2) is arranged below the desulfurizing agent bin (1), and a desulfurizing tower (3) is connected below the desulfurizing agent conveying system (2). An ammonia spraying grid (5) is installed on the right side of the desulfurizing tower (3), and a dust, nitrate, and sulfur (NMHC) integrated reactor (4) is connected to the right side of the ammonia spraying grid (5). An ammonia water metering gasification system (6) is connected to the upper end of the ammonia spraying grid (5), and a dilution fan (7) is installed below the ammonia water metering gasification system (6). A hot blast furnace (8) is arranged on the upper right side of the HC integrated reactor (4), and a variable frequency fan (9) is arranged below the hot blast furnace (8). A waste heat boiler (13) is arranged on the right side of the NMHC integrated reactor (4), and a steam drum (12) is arranged above the waste heat boiler (13), and an induced draft fan (14) is arranged on the right side of the waste heat boiler (13). The right side of the ammonia water metering gasification system (6) is connected to the ammonia water tank (11) through an ammonia water metering pump (10).

2. The environmentally friendly ultra-low emission standard coking flue gas treatment system according to claim 1 is characterized by: The desulfurization tower (3) is provided with an ash outlet at the bottom end so as to be connected to the ash outlet system; and a gas outlet is provided at the top side so as to be connected to the ammonia injection grid (5).

3. The environmentally friendly and ultra-low emission standard coking flue gas treatment system according to claim 1 is characterized by: The air inlet of the ammonia spray grid (5) is provided on the air inlet side so as to be connected to the oxidation blower, so that clean air can be mixed with the flue gas flowing toward the ammonia spray grid and enter the ammonia spray grid (5).

4. The environmentally friendly ultra-low emission standard coking flue gas treatment system according to claim 1 is characterized by: The ammonia spraying grid (5) is provided with a pipeline connected to the ammonia water metering gasification system (6). The ammonia water metering gasification system (6) is connected to the dilution fan and the ammonia water metering pump (10). The ammonia water metering pump (10) is connected to the ammonia water tank (11) containing ammonia water. The industrial ammonia water in the ammonia water tank (11) is transported to the ammonia water metering gasification system (6) through the ammonia water metering pump. The inflowing industrial ammonia water is diluted and gasified by the dilution fan and the ammonia water metering gasification system (6), and the diluted gasified ammonia water is flowed into the ammonia spraying grid (5). Then, the ammonia spraying grid (5) sprays the diluted ammonia water to treat the flue gas flowing through.

5. The environmentally friendly and ultra-low emission standard coking flue gas treatment system according to claim 1 is characterized by: The NMHC integrated reactor (4) is provided with an ash outlet at the bottom end thereof, which is connected to the ash outlet system, and a pipeline connected to the waste heat boiler (13) is provided at the side end thereof.

6. The environmentally friendly and ultra-low emission standard coking flue gas treatment system according to claim 1 is characterized by: The waste heat boiler (13) is provided with a steam drum and a deaerator, and the steam drum performs circulated heat exchange on the flue gas containing waste heat.

Images