Salt-containing process condensate water pretreatment device in chemical production

Abstract

The utility model belongs to the technical field of chemical production, and discloses a salt-containing process condensate water pretreatment device in chemical production, which comprises a first filter, a coke filter, a raw water tank, a resin adsorption system and a qualified water tank which are sequentially communicated through pipelines, valves and pumps, a water outlet of the first filter is communicated to a water inlet of the coke filter, a water outlet of the coke filter is communicated to a water inlet of the raw water tank, a water outlet of the raw water tank is communicated to a water inlet of the resin adsorption system, and a water outlet of the resin adsorption system is communicated to a water inlet of the qualified water tank through the second filter; and the resin adsorption system is also communicated with a resin regeneration system. The device is simple in process flow, the resin can be reused, the ammonia nitrogen in the process water can be effectively reduced, the treatment pressure of a biochemical system is reduced, and the treatment cost is saved.

Description

Technical Field

[0001] The utility model belongs to the technical field of chemical production, and in particular relates to a pretreatment device for salt-containing process condensed water in chemical production. Background Art

[0002] In the chemical production process of biochemical treatment products, process wastewater containing ammonia nitrogen and total nitrogen will be generated. Ammonia nitrogen usually exists in the wastewater in the form of NH4+ cations. After triple-effect evaporation and concentration, the content of ammonia nitrogen and total nitrogen is still very high. If these ions are not treated and directly transported to the wastewater biochemical treatment system, it will seriously impact the ecological balance of the biochemical system and make it difficult to treat. Therefore, it is necessary to treat ammonia nitrogen and total nitrogen before biochemical treatment, but there is no corresponding treatment device in the prior art. Summary of the invention

[0003] The technical problem to be solved by the utility model is to provide a device for pretreating condensed water containing salt in chemical production, which overcomes the defects of the prior art, can effectively absorb and reduce ammonia nitrogen and total nitrogen in water, and reduce the treatment pressure of the biochemical system.

[0004] In order to solve the above technical problems, the technical solution of the utility model is:

[0005] A device for pretreating salt-containing process condensate in chemical production comprises a first filter, a coke filter, a raw water tank, a resin adsorption system and a qualified water tank which are sequentially connected through pipelines, valves and pumps; the water outlet of the first filter is connected to the water inlet of the coke filter, the water outlet of the coke filter is connected to the water inlet of the raw water tank, the water outlet of the raw water tank is connected to the water inlet of the resin adsorption system, and the water outlet of the resin adsorption system is connected to the water inlet of the qualified water tank through a second filter; the resin adsorption system is also connected to a resin regeneration system, and the valve, pump and resin regeneration system are all electrically connected to an automatic control system.

[0006] Preferably, two first filters are arranged in parallel, so that when one filter is shut down, the other filter can be used to ensure the continuity of production.

[0007] Preferably, the first filter and the second filter are both bag filters.

[0008] Preferably, the resin adsorption system is provided with three resin columns, and is operated in a three-column two-series mode. When the No. 1 resin column is saturated, the No. 1 resin column is cut out for regeneration, and the No. 2 and No. 3 resin columns are connected in series for adsorption operation; after a certain period of time, when the No. 2 resin column is saturated, the No. 2 resin column is cut out for regeneration, and the No. 3 and No. 1 resin columns are connected in series for adsorption operation; and so on, to achieve continuous operation of the system.

[0009] Preferably, the resin in the resin adsorption system is ion exchange resin, which has excellent regeneration effect after adsorption saturation, not only fast regeneration efficiency, but also very high resin regeneration rate, which can reach about 98%.

[0010] Preferably, the resin regeneration system comprises an analytical liquid tank, a concentrated acid tank, a first water-washing acid tank and a second water-washing acid tank; the analytical liquid tank is sequentially connected to the first static mixer, the condenser, the resin adsorption system and the raw water tank through a water-washing pump (the analytical liquid is pushed into the raw water tank from the resin adsorption system); the concentrated acid tank and the qualified water tank are sequentially connected to the resin adsorption system and the analytical liquid tank through the first static mixer and the condenser, and the analytical liquid tank is connected with an analytical liquid discharge pipe; the first water-washing acid tank is respectively connected to the resin adsorption system and the analytical liquid tank through a water-washing pump, and the second water-washing acid tank is respectively connected to the resin adsorption system and the first water-washing acid tank through a water-washing pump; the qualified water tank is connected to the resin adsorption system through a water-washing pump.

[0011] Preferably, the qualified water tank is also connected in parallel with a concentrated alkali tank, and the qualified water tank and the concentrated alkali tank are connected to the second static mixer and the online detection pH meter through a pump, and then connected to the biochemical treatment device. The online detection pH meter and the pump are both electrically connected to the automatic control system.

[0012] Preferably, a thermometer and a remote pressure sensor are provided on the pipeline between the condenser and the resin adsorption system to detect temperature and pressure in real time; a remote pressure sensor is also provided on the pipeline between the raw water tank and the resin adsorption system to detect pressure in real time. Both the thermometer and the remote pressure sensor are electrically connected to the automatic control system.

[0013] Preferably, the automatic control system is a PLC automatic control system.

[0014] Due to the adoption of the above technical solution, the beneficial effects of the utility model are:

[0015] 1. The utility model uses a resin adsorption system to adsorb ammonia nitrogen in each process water (the total nitrogen in the process water is about 800-1200 mg / L), and the ammonia nitrogen removal rate reaches 95%-98% (the total nitrogen in the qualified water after treatment is about 50 mg / L or less, and the qualified water can be used for biochemical treatment). The treated water is then pH-adjusted with a strong alkali to neutrality, and finally enters the biochemical treatment. The qualified water after pretreatment can be completely treated by the biochemical system, reducing the treatment pressure of the biochemical system;

[0016] 2. The resin adsorption system of the utility model adopts a process of three columns and two columns in series operation to adsorb and remove ammonia nitrogen, and a single column regeneration. The whole system is divided into two working states, adsorption state and regeneration state; it can achieve 24h continuous operation and treat 400 cubic meters of water per day; the resin adsorption system adopts ion exchange resin, which has excellent regeneration effect after adsorption saturation, not only with fast regeneration efficiency, but also with very high resin regeneration rate, which can reach about 98%;

[0017] 3. The resin regeneration system of the utility model is connected with an automatic control system, which can realize manual / automatic switching, and can realize start, pause and stop in the automatic mode, thereby ensuring the regeneration efficiency and regeneration effect of the resin.

[0018] In short, the utility model has a simple process flow, the resin can be reused, and can effectively reduce ammonia nitrogen in process water, reduce the treatment pressure of the biochemical system, and save treatment costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of an embodiment of the utility model;

[0020] In the figure, 1. first filter; 2. coke filter; 3. raw water tank; 4. resin adsorption system; 5. qualified water tank; 6. second filter; 7. analytical liquid tank; 8. concentrated acid tank; 9. first water washing acid tank; 10. second water washing acid tank; 11. water washing pump; 12. first static mixer; 13. condenser; 14. concentrated alkali tank; 15. second static mixer; 16. valve array; 17. analytical liquid discharge pipe; 18. online detection pH meter; 19. liquid alkali pump. DETAILED DESCRIPTION

[0021] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0022] Embodiment 1:

[0023] like Figure 1As shown, a salt-containing process condensate pretreatment device in chemical production includes a first filter 1, a coke filter 2, a raw water tank 3, a resin adsorption system 4 and a qualified water tank 5 which are connected in sequence through pipelines, valves and pumps; the water inlet of the first filter 1 is connected to each process water output pipeline, the water outlet of the first filter 1 is connected to the water inlet of the coke filter 2, the water outlet of the coke filter 2 is connected to the water inlet of the raw water tank 3, the water outlet of the raw water tank 3 is connected to the water inlet of the resin adsorption system 4, and the water outlet of the resin adsorption system 4 is connected to the water inlet of the qualified water tank 5 through a second filter 6; the resin adsorption system 4 is also connected to a resin regeneration system (analysis regeneration and adsorption are both in the valve array, and the corresponding valves are switched in the valve to realize the analysis regeneration system and the adsorption system), and the resin adsorption and analysis regeneration are automatically switched through the valve array 16. The valve, pump and resin regeneration system are all electrically connected to the automatic control system (not marked).

[0024] The resin regeneration system includes an analytical liquid tank 7, a concentrated acid tank 8, a first water-washing acid tank 9 and a second water-washing acid tank 10. The analytical liquid tank 7 is connected to the first static mixer 12, the condenser 13, the resin adsorption system 4 and the raw water tank 3 in sequence through a water-washing pump 11; the concentrated acid tank 8 and the qualified water tank 5 are connected to the resin adsorption system 4 and the analytical liquid tank 7 in sequence through the first static mixer 12 and the condenser 13, and the analytical liquid tank 7 is connected to a analytical liquid discharge pipe 17); the first water-washing acid tank 9 is connected to the resin adsorption system 4 and the analytical liquid tank 7 respectively through the water-washing pump 11, and the second water-washing acid tank 10 is connected to the resin adsorption system 4 and the first water-washing acid tank 9 respectively through the water-washing pump 11; the qualified water tank 5 is connected to the resin adsorption system 4 through the water-washing pump 11.

[0025] The qualified water tank 5 is also connected in parallel with a concentrated alkali tank 14. The qualified water tank 5 and the concentrated alkali tank 14 are connected to the second static mixer 15 and the online detection pH meter 18 through a liquid alkali pump 19, and then enter the biochemical storage tank through a pipeline connection for treatment.

[0026] During actual production: the process water of each production section passes through the first filter 1 and the coke filter 2 through the pipeline into the raw water tank 3, and then enters the resin adsorption system 4 through the adsorption feed pump for adsorption, and then enters the qualified water tank 5 through the second filter 6, and then the liquid alkali discharged from the treated water effluent pump and the concentrated alkali tank 14 enters the second static mixer 15 and the online detection pH meter at the same time and is transported to the biochemical treatment device for treatment.

[0027] When the resin in the resin column of the resin adsorption system 4 is saturated, the analytical liquid in the analytical liquid tank 7 is first transported to the resin column through the water washing pump 11 to push the saturated water into the raw water tank 3, and then the qualified water in the qualified water tank 5 and the hydrochloric acid in the concentrated acid tank 8 are configured into 8%-10% analytical liquid, and these analytical liquids are passed through the first static mixer 12 into the condenser 13 for cooling, and then the cooled analytical liquid is transported to the resin column of the resin adsorption system 4 to parse the regenerated resin, and the analyzed analytical liquid enters the analytical liquid tank 7, Excess analytical liquid is discharged to the tank area through the analytical liquid discharge pump; the washing acid water in the first washing acid tank 9 enters the resin column through the washing pump 11 for the first washing, and the water after washing is transported to the analytical liquid tank 7, the washing acid water in the second washing acid tank 10 enters the resin column through the washing pump 11 for the second washing, and the water after washing enters the first washing acid tank 9, the qualified water in the qualified water tank 5 enters the resin column through the washing pump 11 for the third washing, and the water after washing enters the second washing acid tank 10, and the analysis and regeneration of the resin column is completed.

[0028] It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the claims attached to this application.

Claims

1. A device for pre-treating salt-containing condensate water in chemical production, characterized in that: It includes a first filter, a coke filter, a raw water tank, a resin adsorption system and a qualified water tank which are connected in sequence through pipelines, valves and pumps; the water outlet of the first filter is connected to the water inlet of the coke filter, the water outlet of the coke filter is connected to the water inlet of the raw water tank, the water outlet of the raw water tank is connected to the water inlet of the resin adsorption system, and the water outlet of the resin adsorption system is connected to the water inlet of the qualified water tank through a second filter; the resin adsorption system is also connected to a resin regeneration system, and the valve, pump and resin regeneration system are all electrically connected to an automatic control system.

2. The salt-containing process condensate pretreatment device in chemical production according to claim 1, characterized in that: Two first filters are arranged in parallel.

3. The salt-containing process condensate pretreatment device in chemical production according to claim 1, characterized in that: The first filter and the second filter are both bag filters.

4. The salt-containing process condensate pretreatment device in chemical production according to claim 1, characterized in that: The resin adsorption system is provided with three resin columns and operates in a three-column two-series mode.

5. The salt-containing process condensate pretreatment device in chemical production according to claim 1, characterized in that: The resin regeneration system comprises an analytical liquid tank, a concentrated acid tank, a first water-washing acid tank and a second water-washing acid tank. The analytical liquid tank is connected to the first static mixer, the condenser, the resin adsorption system and the raw water tank in sequence through a water-washing pump; the concentrated acid tank and the qualified water tank are connected to the resin adsorption system and the analytical liquid tank in sequence through the first static mixer and the condenser, and the analytical liquid tank is connected with an analytical liquid discharge pipe; the first water-washing acid tank is connected to the resin adsorption system and the analytical liquid tank respectively through the water-washing pump, and the second water-washing acid tank is connected to the resin adsorption system and the first water-washing acid tank respectively through the water-washing pump; the qualified water tank is connected to the resin adsorption system through the water-washing pump.

6. The salt-containing process condensate pretreatment device in chemical production according to claim 1, characterized in that: The qualified water tank is also connected in parallel with a concentrated alkali tank, and the qualified water tank and the concentrated alkali tank are connected to the second static mixer and the online detection pH meter through a pump, and then connected to the biochemical treatment device.

7. The salt-containing process condensate pretreatment device in chemical production according to claim 5, characterized in that: A thermometer and a remote pressure sensor are arranged on the pipeline between the condenser and the resin adsorption system, and a remote pressure sensor is also arranged on the pipeline between the raw water tank and the resin adsorption system.

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