Environment-friendly treatment system for waste residue water quenching flue gas of flash furnace

Abstract

The utility model discloses an environment-friendly treatment system for waste residue water quenching flue gas of a flash furnace, which belongs to the field of flue gas treatment and comprises an efficient scrubber, the efficient scrubber is of a vertical tubular structure with a closed top end, and a flue gas inlet is formed in one side of the top of the efficient scrubber. A high-energy nozzle and a baffling device are sequentially arranged in the efficient washer from top to bottom, a nozzle opening of the high-energy nozzle is vertically upward, and the baffling device is composed of a plurality of baffle plates arranged on the inner wall of the efficient washer in a staggered mode. The bottom end of the efficient scrubber is connected with a gas inlet in the bottom of the separation tower through an inclined pipe, a circulating liquid storage tank is formed in the bottom in the separation tower, and the middle of the circulating liquid storage tank is connected with the high-energy nozzle through a circulating pump A. A demister and a first-stage electric demister are sequentially arranged in the separation tower from bottom to top. A flue gas outlet in the top end of the first-stage electric demister is sequentially connected with a second-stage electric demister, an exhaust fan and a chimney. The device has the advantages of good treatment effect, low cost, no generation of three wastes in the treatment process, and no secondary pollution.

Description

Technical Field

[0001] The utility model belongs to the field of flue gas treatment, and particularly relates to an environmental protection treatment system for the water quenching flue gas of flash furnace slag. Background Technique

[0002] In recent years, the degree of heavy metal pollution in the soil of our country has gradually expanded from the suburbs to the countryside, bringing great challenges to the environmental governance and protection work of non-ferrous smelting enterprises. The comprehensive utilization of smelting solid waste has become an important topic in the smelting industry. The harmless treatment and re-resource utilization of these wastes have opened up an important way for the smelting industry to improve energy utilization efficiency and thus reduce energy consumption.

[0003] In the flash smelting + flash converting ("double flash") process for smelting copper concentrate to produce blister copper, high-temperature molten slag will be generated. At present, the water quenching treatment method is generally adopted for high-temperature molten slag. The water quenching process of matte and converting slag is to introduce the molten fluid of matte and converting slag into the water quenching tower through a chute, and the molten fluid is broken and granulated by the pressurized water flow in the water quenching tower. The granulated matte and slag enter the water quenching pool for further cooling. The water quenching process will generate flue gas containing harmful substances such as sulfur and fine particulate dust. In order to avoid affecting the environment, the flue gas needs to be treated before being discharged. Due to the characteristics of the short-term large flow rate of the water quenching flue gas, the conventional flue gas washing method has problems such as poor treatment efficiency and equipment damage caused by excessive short-term load. In addition, the flue gas contains a large amount of water after washing, and the conventional demisting means cannot remove the fine droplets entrained in the flue gas, which is easy to cause secondary pollution. Therefore, improvement is urgently needed. Content of the Utility Model

[0004] The purpose of the utility model is to overcome the above-mentioned deficiencies in the technology, and provide an environmental protection treatment system for the water quenching flue gas of flash furnace slag, which has good treatment effect, low cost, and does not generate three wastes and secondary pollution during the treatment process.

[0005] In order to achieve the above-mentioned utility model purpose, the technical solution adopted by the utility model is as follows:

[0006] An environmental protection treatment system for water-quenched flue gas from waste slag of a flash furnace comprises a high-efficiency scrubber, characterized in that the high-efficiency scrubber is a vertical tubular structure with a closed top, and a flue gas inlet is arranged on one side of the top of the high-efficiency scrubber, and a high-energy nozzle and a deflection device are arranged in sequence from top to bottom in the high-efficiency scrubber, the nozzle of the high-energy nozzle is vertically upward, and the deflection device is composed of a plurality of deflectors staggered on the inner wall of the high-efficiency scrubber; the bottom end of the high-efficiency scrubber is connected to the bottom air inlet of a separation tower through an inclined tube, a circulating liquid storage tank is formed at the bottom of the separation tower, and the middle part of the circulating liquid storage tank is connected to the high-energy nozzle through a circulating pump A, and a demister and a first-level electrostatic precipitator are arranged in sequence from bottom to top in the separation tower, and the flue gas outlet at the top of the first-level electrostatic precipitator is sequentially connected to a second-level electrostatic precipitator, an exhaust fan and a chimney.

[0007] A further improvement of the utility model is that a plurality of through holes are arranged on the baffle plate, and the flue gas flows in an S-shape in the baffle device. At the same time, the circulating liquid sprayed and falling through the high-energy nozzle drips downward from the through holes of the baffle plate, and splashes on the next layer of baffle plate. In the process of the flue gas flowing between the baffle plates, the contact time with the circulating liquid is prolonged. At the same time, the dripping and splashing of the circulating liquid causes it to collide violently with the flue gas, thereby achieving a better desulfurization absorption effect.

[0008] A further improvement of the utility model is that the bottom end of the high-efficiency scrubber is higher than the bottom air inlet of the separation tower.

[0009] A further improvement of the utility model is that the bottom of the circulating liquid storage tank is connected to the matte water quenching pool through a circulating pump B, and the circulating liquid storage tank is connected to an external new liquid replenishing system. During operation, a certain amount of circulating liquid at the bottom of the circulating liquid storage tank is sent to the matte water quenching pool. On the one hand, the cooling water that is continuously evaporated and lost in the matte water quenching pool is replenished, and on the other hand, the circulating liquid that has absorbed fine particles of dust is discharged. At the same time, the circulating liquid in the circulating liquid storage tank is replenished through the new liquid replenishing system, thereby ensuring that the circulating liquid's ability to purify flue gas meets the requirements and reducing the adverse effects of solid matter in the circulating liquid on the device, thereby improving processing efficiency, reducing costs and waste liquid disposal.

[0010] A further improvement of the utility model is that the demister is a wire mesh demister and is provided with two layers, so as to achieve efficient foam capture and prevent the foam from affecting the subsequent electric demisting process.

[0011] A further improvement of the utility model is that a spray device is arranged above the demister, the first-stage electric demister and the second-stage electric demister, and the spray device is connected to the grey water system through a pipeline. After the flue gas treatment process is completed, the demister, the first-stage electric demister and the second-stage electric demister are regularly flushed to maintain the best purification performance.

[0012] A further improvement of the utility model is that the first-stage electric demister and the second-stage electric demister are arranged in parallel, the first-stage electric demister is a flue gas inlet-outlet structure at the bottom, and the second-stage electric demister is a flue gas inlet-outlet structure at the top. By arranging two stages of electric demisters, thorough purification of wet flue gas and a small amount of impurities entrained in the flue gas can be achieved, thereby ensuring ultra-clean flue gas emissions.

[0013] The beneficial effects of the utility model are:

[0014] The utility model adopts reverse washing and baffle collision technology to the flue gas granulated by blowing slag, so as to realize efficient interception, absorption and purification of sulfur dioxide and large particles of smoke in the flue gas. At the same time, the utility model cooperates with the defoaming and secondary electrostatic demister technology to effectively intercept and purify the ultrafine dust and fog particles in the purified flue gas. The treatment process does not generate the three wastes and there is no secondary pollution. In addition, the circulating liquid in the utility model can be reused in the matte water quenching cooling link after desulfurization and dust removal, so as to realize resource utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the utility model.

[0016] In the figure: high-efficiency scrubber 1, flue gas inlet 2, high-energy nozzle 3, baffle device 4, baffle 5, separation tower 6, circulating liquid storage tank 7, circulating pump A8, demister 9, primary electric demister 10, secondary electric demister 11, exhaust fan 12, chimney 13, through hole 14, circulating pump B15, spray device 16. DETAILED DESCRIPTION

[0017] The technical solution of the utility model is further described in detail below through specific embodiments and in conjunction with the accompanying drawings:

[0018] like Figure 1 As shown, an environmental protection treatment system for water-quenched flue gas from waste slag of a flash furnace comprises a high-efficiency scrubber 1, which is a vertical tubular structure with a closed top, and a flue gas inlet 2 is arranged on one side of the top of the high-efficiency scrubber 1, and a high-energy nozzle 3 and a deflection device 4 are arranged in sequence from top to bottom in the high-efficiency scrubber 1, the nozzle of the high-energy nozzle 3 is vertically upward, and the deflection device 4 is composed of a plurality of deflectors 5 staggered on the inner wall of the high-efficiency scrubber 1; the bottom end of the high-efficiency scrubber 1 is connected to the bottom air inlet of a separation tower 6 through an inclined tube, and the bottom end of the high-efficiency scrubber 1 is higher than the bottom air inlet of the separation tower 6, and a circulating liquid storage tank 7 is formed at the bottom of the separation tower 6, and the middle part of the circulating liquid storage tank 7 is connected to the high-energy nozzle 3 through a circulating pump A8, and a demister 9 and a first-level electric precipitator 10 are arranged in sequence from bottom to top in the separation tower 6, and the flue gas outlet at the top of the first-level electric precipitator 10 is sequentially connected to a second-level electric precipitator 11, an exhaust fan 12 and a chimney 13.

[0019] In this embodiment, a number of through holes 14 are arranged on the baffle plate 5. The flue gas flows in an S shape within the baffle device 4. Meanwhile, the circulating liquid sprayed out and falling from the high-energy nozzle 3 drips downward through the through holes 14 of the baffle plate 5 and splashes on the next layer of the baffle plate 5. During the process of the flue gas flowing between the baffle plates 5, the contact time with the circulating liquid is prolonged. At the same time, the dripping and splashing of the circulating liquid cause intense collision with the flue gas, thereby achieving a better desulfurization absorption effect.

[0020] In this embodiment, the bottom of the circulating liquid storage tank 7 is connected to the matte water quenching tank through the circulating pump B15, and the circulating liquid storage tank 7 is connected to an external fresh liquid replenishment system. During operation, a certain amount of the circulating liquid at the bottom of the circulating liquid storage tank 7 is sent to the matte water quenching tank. On the one hand, it replenishes the continuously evaporating and losing cooling water in the matte water quenching tank. On the other hand, it discharges the circulating liquid that has absorbed fine particulate dust. At the same time, the circulating liquid in the circulating liquid storage tank 7 is replenished through the fresh liquid replenishment system, ensuring that the purification ability of the circulating liquid for the flue gas meets the requirements, and also reducing the adverse effects of the solids in the circulating liquid on the device, playing a role in improving the treatment efficiency, reducing costs, and disposing of waste liquid.

[0021] In this embodiment, the demister 9 is a wire mesh demister, and two layers of demisters 9 are provided to achieve efficient foam capture and prevent foam from affecting the subsequent electric demisting process.

[0022] In this embodiment, spray devices 16 are arranged above the demister 9, the primary electric demister 10, and the secondary electric demister 11. The spray devices 16 are connected to the reclaimed water system through pipelines. After the flue gas treatment process is completed, the demister 9, the primary electric demister 10, and the secondary electric demister 11 are regularly flushed to maintain the best purification performance.

[0023] In this embodiment, the primary electric demister 10 and the secondary electric demister 11 are arranged in parallel. The primary electric demister 10 has a structure where the flue gas enters from the bottom and exits from the top, and the secondary electric demister 11 has a structure where the flue gas enters from the top and exits from the bottom. By setting two-stage electric demisters, the thorough purification of the wet flue gas and a small amount of impurities entrained in the flue gas is achieved, ensuring the ultra-clean emission of the flue gas.

[0024] The above-mentioned environmental protection treatment process for the flash furnace slag water quenching flue gas includes the following specific steps:

[0025] (1) The granulated flue gas from the blowing slag vertically enters the high-efficiency scrubber 1. At the same time, the high-energy nozzle 3 sprays upward a circulating liquid in a solid and uniformly dispersed state. The circulating liquid is specifically lime slurry. The vertically downward flue gas and the upward circulating liquid collide reversely to achieve an efficient heat and mass transfer process, and the heat, SO2 and dust in the flue gas are absorbed for the first time. Subsequently, the flue gas and the falling circulating liquid further contact and collide in the baffle device 4, and the heat, SO2 and dust in the flue gas are absorbed for the second time, realizing complete desulfurization and the removal of most dust impurities. Among them, after the circulating liquid is sprayed by the high-energy nozzle 3 and contacts and absorbs the flue gas, it flows along the inclined pipe to the bottom of the separation tower 6. The part with a higher impurity content at the bottom of the separation tower 6 is pumped to the matte quenching pool for secondary utilization, and at the same time, an appropriate amount of new liquid is replenished to the bottom of the separation tower 6 for spraying by the high-energy nozzle 3;

[0026] (2) The flue gas processed in step (1) enters the separation tower 6 along the inclined pipe. After the foam and larger liquid droplets are intercepted by the demister 9, it enters the primary electrostatic demister 10. Under the action of the electric field, the dust-containing mist particles in the flue gas are removed;

[0027] (3) The flue gas processed in step (2) enters the secondary electrostatic demister. The entry method is vertically from top to bottom, and the gas flow direction is consistent with the hanging direction of the cathode wire, which is beneficial to driving the dust in the gas to the anode. The secondary electrostatic demister completely intercepts and purifies the ultrafine dust and mist particles, and the purified flue gas is discharged through the chimney 13.

[0028] (4) After the flue gas treatment is completed, the demister 9, the primary electrostatic demister 10 and the secondary electrostatic demister 11 are sprayed and rinsed through the spraying device 16 to maintain their best performance.

[0029] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention without departing from the principle and purpose of the present invention. Any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. An environmental protection treatment system for flash furnace waste slag water quenching flue gas, including a high-efficiency scrubber, characterized in that: The high-efficiency scrubber is a vertical tubular structure with a closed top, and a flue gas inlet is arranged on one side of the top of the high-efficiency scrubber. A high-energy nozzle and a deflection device are arranged in sequence from top to bottom in the high-efficiency scrubber. The nozzle of the high-energy nozzle is vertically upward, and the deflection device is composed of a number of deflectors staggered on the inner wall of the high-efficiency scrubber; the bottom end of the high-efficiency scrubber is connected to the bottom air inlet of the separation tower through an inclined tube, and a circulating liquid storage tank is formed at the bottom of the separation tower, and the middle part of the circulating liquid storage tank is connected to the high-energy nozzle through a circulating pump A. A demister and a first-level electrostatic precipitator are arranged in sequence from bottom to top in the separation tower, and the flue gas outlet at the top of the first-level electrostatic precipitator is sequentially connected to a second-level electrostatic precipitator, an exhaust fan and a chimney.

2. The environmental protection treatment system for flash furnace waste slag water quenching flue gas according to claim 1 is characterized in that: The baffle is provided with a plurality of through holes.

3. The environmental protection treatment system for flash furnace waste slag water quenching flue gas according to claim 1 is characterized in that: The bottom end of the high-efficiency scrubber is higher than the bottom air inlet of the separation tower.

4. The environmental protection treatment system for flash furnace waste slag water quenching flue gas according to claim 1 is characterized in that: The bottom of the circulating liquid storage tank is connected to the matte water quenching tank through a circulating pump B, and the circulating liquid storage tank is connected to an external new liquid replenishing system.

5. The environmental protection treatment system for flash furnace waste slag water quenching flue gas according to claim 1 is characterized in that: The demister is a wire mesh demister, and the demister is provided with two layers.

6. The environmental protection treatment system for flash furnace waste slag water quenching flue gas according to claim 1 is characterized in that: A spray device is arranged above the demister, the first-stage electrostatic demister and the second-stage electrostatic demister, and the spray device is connected to the reclaimed water system through a pipeline.

7. The environmental protection treatment system for flash furnace waste slag water quenching flue gas according to claim 1 is characterized in that: The first-stage electric demister and the second-stage electric demister are arranged in parallel. The first-stage electric demister has a flue gas bottom-in and top-out structure, while the second-stage electric demister has a flue gas top-in and bottom-out structure.

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