An ammonium sulfate acid tar cleaning automation system

Abstract

The utility model relates to a kind of automatic system of ammonium sulfate acid tar cleaning, belong to waste separation removal technical field, specifically including the overflow port of full flow tank and mother liquor storage tank group are connected, the outlet of mother liquor storage tank group is connected with small mother liquor pump group, the liquid outlet of small mother liquor pump group is connected with saturator, and the liquid outlet of small mother liquor pump group is also connected with stirring tank by first connecting pipe, the bottom of stirring tank is connected with reflux pump group, reflux pump group is connected with full overflow tank by second connecting pipe, third connecting pipe is also connected on second connecting pipe, third connecting pipe is connected with the outlet of ammonia water pump group, the inlet of ammonia water pump group is connected with ammonia water tank, ammonia water regulating valve is connected on third connecting pipe.It solves the process and safety problem of acid tar in the whole production system, increases ammonia water control valve cascade control to realize balanced mother liquor acidity remote automatic operation, achieves unattended, reduces worker's labor efficiency and the like.

Description

Technical Field

[0001] This utility model relates to an automated system for cleaning ammonium sulfate tar, belonging to the field of waste separation and removal technology. Background Technology

[0002] One process for ammonia recovery from coke oven gas is the production of ammonium sulfate using a saturator. Because the saturator method integrates acid washing, acid removal, and crystallization, the equipment is compact and has high ammonia removal efficiency, and it has been widely adopted in most coking plants. The saturator spray pipes spray a mother liquor containing a low concentration of sulfuric acid, which comes into counter-current contact with the coke oven gas to achieve ammonia removal. During the spraying process, the ammonium sulfate mother liquor washes off a small amount of tar. This tar cannot be completely removed by previous processes and reacts with H2SO4 to form acid tar, which also contains coal dust and coke dust.

[0003] In the production process of ammonium sulfate, the full-flow chute is an auxiliary facility. The saturator mother liquor full-flow device allows the mother liquor to flow out of the saturator and simultaneously acts as a gas-water seal. It is generally designed with an open structure to facilitate manual cleaning of the acid tar floating on the top of the ammonium sulfate mother liquor collected in the full-flow chute. When there is a large amount of acid tar on the top of the mother liquor, it must be manually removed promptly; otherwise, it will affect the quality of ammonium sulfate and, in severe cases, will form foam in the saturator, affecting the reflux ratio: 1. It will cause the saturator liquid level to rise, blocking the gas and increasing the saturator resistance; 2. After the full-flow chute overflows, the saturator liquid level will drop, making it unable to absorb ammonia from the gas, leading to an increase in the ammonia content of the gas. However, the manual removal of acid tar is labor-intensive. Although a VOC tail gas treatment system is provided, the open-cover removal still results in tail gas leakage, and the tail gas contains various toxic and harmful substances, potentially causing gas poisoning for workers during the removal process. Therefore, we propose an automated system for cleaning ammonium sulfate acid tar. Utility Model Content

[0004] To address the technical problems existing in the prior art, this utility model provides an automated system for cleaning ammonium sulfate tar. It solves the process and safety issues of acid tar in the entire production system. It adds ammonia water control valve cascade control to achieve remote automatic operation to balance the acidity of the mother liquor, effectively controlling parameters such as the full flow level and pressure, and the inlet opening of the ammonia water control valve, thus achieving the effects of unattended operation and reduced labor efficiency.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is an automated system for cleaning ammonium sulfate tar, comprising a full-flow tank, a mother liquor storage tank group, and an ammonia water tank. The overflow port of the full-flow tank is connected to the mother liquor storage tank group, the outlet of the mother liquor storage tank group is connected to a small mother liquor pump group, the outlet of the small mother liquor pump group is connected to a saturator, and the outlet of the small mother liquor pump group is also connected to a stirring tank through a first connecting pipe. A reflux pump group is connected to the bottom of the stirring tank, and the reflux pump group is connected to the full-flow tank through a second connecting pipe. A third connecting pipe is also connected to the second connecting pipe, and the third connecting pipe is connected to the outlet of the ammonia water pump group. The inlet of the ammonia water pump group is connected to the ammonia water tank, and an ammonia water regulating valve is connected to the third connecting pipe.

[0006] Preferably, the upper part of the mixing tank is provided with an overflow port, which is connected to an acid tar collection tank. The acid tar collection tank is connected to a tar-ammonia water separation tank. A flotation machine is installed inside the mixing tank, which is used to scrape the acid tar that floats out in the mixing tank into the acid tar collection tank.

[0007] Preferably, the liquid level in the mixing tank is level with the lowest point of the scraper of the flotation machine.

[0008] Preferably, the first connecting pipe is provided with a stirring tank level regulating valve, which is used to adjust the flow rate of the connecting pipe, and the maximum value of the flow rate does not exceed 1 / 7 of the desaturator flow rate.

[0009] Preferably, a differential pressure flow meter is also installed on the second connecting pipe, and the differential pressure flow meter, the ammonia water regulating valve, and the mixing tank level regulating valve are interlocked.

[0010] Compared with the prior art, this utility model has the following technical effects: This utility model automatically regulates the amount of mother liquor entering the mixing tank by adjusting the liquid level, and automatically opens the flotation scraper of the mixing tank at the high liquid level to achieve automatic separation of acid tar, thus solving the process and safety problems of acid tar in the entire production system. It also adds cascade control of ammonia water control valve to achieve remote automatic operation to balance the acidity of the mother liquor, effectively controlling parameters such as the full flow liquid level and pressure, and the inlet opening of the ammonia water control valve, achieving the effects of unattended operation and reduced labor efficiency. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of this utility model. Detailed Implementation

[0012] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0013] like Figure 1 As shown, an automated system for cleaning ammonium sulfate tar includes a full-flow tank 1, a mother liquor storage tank group 2, and an ammonia water tank 3. The overflow port of the full-flow tank 1 is connected to the mother liquor storage tank group 2. The outlet of the mother liquor storage tank group 2 is connected to a small mother liquor pump group 4. The outlet of the small mother liquor pump group 4 is connected to a saturator. The outlet of the small mother liquor pump group 4 is also connected to a stirring tank 7 through a first connecting pipe 5. A reflux pump group 8 is connected to the bottom of the stirring tank 7. The reflux pump group 8 is connected to the full-flow tank 1 through a second connecting pipe 9. A third connecting pipe 10 is also connected to the second connecting pipe 9. The third connecting pipe 10 is connected to the outlet of an ammonia water pump group 11. The inlet of the ammonia water pump group 11 is connected to the ammonia water tank 3. An ammonia water regulating valve 13 is connected to the third connecting pipe 10.

[0014] The mixing tank 7 has an overflow port 14 at its upper part, which is connected to an acid tar collection tank 15. The acid tar collection tank 15 is connected to an ammonia-tar separation tank. A flotation machine 16 is installed inside the mixing tank 7 to scrape the acid tar floating in the mixing tank into the acid tar collection tank 15. The liquid level in the mixing tank 7 is kept level with the lowest point of the scraper of the flotation machine 16. A mixing tank level regulating valve 6 is installed on the first connecting pipe 5 to adjust the flow rate of the connecting pipe, and the maximum flow rate does not exceed 1 / 7 of the desaturator flow rate. A differential pressure flow meter 12 is also installed on the second connecting pipe 9. The differential pressure flow meter 12, the ammonia-tar regulating valve 13, and the mixing tank level regulating valve 6 are interlocked. The differential pressure flow meter 12 is installed between the reflux pump group 8 and the full flow tank 1, and is installed before the ammonia-tar regulating valve 13.

[0015] In practical use, after the ammonium sulfate section's washing process, the mother liquor is transported through pipelines from the full chute 1 to the mother liquor storage tank group 2. The mother liquor in the storage tank group 2 is then pumped by the small mother liquor pump group 4 and enters the saturator for spraying and circulation. Another portion is transported to the mixing tank 7. To achieve unmanned operation, a cascade flow control valve is added at the inlet of the mixing tank 7 to regulate the flow rate of the mother liquor entering the mixing tank 7. The liquid level in the mixing tank 7 should be maintained approximately at the same level as the flotation machine to achieve the desired effect. To avoid affecting the spraying effect of the saturator, the maximum flow rate is set not to exceed 1 / 7 of the saturator's capacity. After the mother liquor enters the mixing tank 7, it contains acid tar. To achieve better solid-liquid separation, the mixing tank 7 needs continuous stirring with a stirring rod. However, the acid tar easily generates foam under frequent stirring, affecting the level gauge reading and potentially causing overflow. Therefore, the mixing tank is equipped with a pulley with a large differential ratio to achieve a reasonable rotational speed driven by the motor. After acid tar floats to the surface of the mother liquor in the stirred tank, the flotation machine 16 rotates, driving the scraper blades to separate the acid tar from the surface of the mother liquor into the acid tar collection tank 15, and then transport it to the tar-ammonia water separation tank. The remaining mother liquor in the stirred tank 7 is returned to the full flow tank by the reflux pump to complete the acid tar separation step. To balance the acidity of the mother liquor, a 20% concentration ammonia water is drawn from the ammonia water tank by the desulfurization and denitrification ammonia water pump and introduced into the reflux pipeline. An ammonia water regulating valve 13 is set to increase cascade control. The opening of the ammonia water regulating valve 13 can be adjusted according to the liquid level in the stirred tank and the differential pressure flow meter, and the redundant control can keep the acidity of the mother liquor at 3-3.5%. By precisely controlling the pipeline entering the ammonium sulfate system, the quality of the mother liquor is ensured to be controllable and reliable. The elimination of acid tar is completed with the least resources and the maximum precision control is achieved, thus improving the quality requirements of the mother liquor.

[0016] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model shall be included within the scope of the present utility model.

Claims

1. An automated system for cleaning ammonium sulfate tar, comprising a full-flow tank, a mother liquor storage tank group, and an ammonia water tank, characterized in that: The overflow port of the full-flow trough is connected to the mother liquor storage tank group. The outlet of the mother liquor storage tank group is connected to the small mother liquor pump group. The outlet of the small mother liquor pump group is connected to the saturator. The outlet of the small mother liquor pump group is also connected to the stirring tank through a first connecting pipe. The bottom of the stirring tank is connected to a reflux pump group. The reflux pump group is connected to the full-flow trough through a second connecting pipe. A third connecting pipe is also connected to the second connecting pipe. The third connecting pipe is connected to the outlet of the ammonia water pump group. The inlet of the ammonia water pump group is connected to the ammonia water tank. An ammonia water regulating valve is connected to the third connecting pipe.

2. An automated system for cleaning of ammonium sulphate tar according to claim 1, characterized in that: The upper part of the mixing tank is provided with an overflow port, which is connected to an acid tar collection tank. The acid tar collection tank is connected to a tar-ammonia water separation tank. A flotation machine is installed inside the mixing tank, which is used to scrape the acid tar that floats out of the mixing tank into the acid tar collection tank.

3. The automated system for cleaning ammonium sulfate tar according to claim 2, characterized in that: The liquid level in the mixing tank is kept level with the lowest point of the scraper in the flotation machine.

4. The automated system for cleaning of ammonium sulfate acid tar according to claim 1, characterized in that: The first connecting pipe is equipped with a stirring tank level regulating valve, which is used to adjust the flow rate of the connecting pipe, and the maximum value of the flow rate does not exceed 1 / 7 of the desaturator flow rate.

5. The automated system for cleaning ammonium sulfate tar according to claim 4, characterized in that: A differential pressure flow meter is also installed on the second connecting pipe, and the differential pressure flow meter, ammonia water regulating valve and stirring tank level regulating valve are interlocked.

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