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A zero-emission system and process for vehicle exhaust gas desulfurization catalyst wastewater

A desulfurization catalyst and catalyst technology, applied in the direction of chemical instruments and methods, inorganic chemistry, ammonium sulfate, etc., can solve the problems of no re-discharge of waste water, high treatment costs, etc., and achieve the reduction of sewage discharge costs, obvious advantages of energy saving, and reduced consumption Effect

Active Publication Date: 2021-11-23
山东瑞琦能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1. A large amount of liquid alkali needs to be added to the wastewater for pH adjustment, and the treatment cost is high;
[0005] 2. The wastewater after removing ammonia nitrogen from the stripper is high-salt wastewater. With the improvement of the national wastewater discharge standards, especially the requirements for the salt content in the discharged wastewater, the wastewater will no longer be discharged to the sewage treatment plant

Method used

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  • A zero-emission system and process for vehicle exhaust gas desulfurization catalyst wastewater

Examples

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example 1

[0035] Example 1: A zero-discharge treatment system for exhaust gas desulfurization catalyst wastewater for vehicles

[0036] The treatment system includes: regulating tank system, evaporative concentration system, evaporative crystallization system, cooling crystallization system and mother liquor drying system, among which:

[0037] The regulating tank system is provided with an inlet and an outlet of catalyst wastewater, and the outlet is sequentially connected to a preheating system, an evaporation concentration system, an evaporation crystallization system, a cooling crystallization system and a mother liquor drying system;

[0038] The condensed water produced by the evaporation concentration system, evaporation crystallization system, cooling crystallization system and mother liquor drying system returns to the preheating system, and then enters the catalyst production system;

[0039] The evaporation crystallization system and the cooling crystallization system are res...

Embodiment 2

[0043] Example 2: A zero-discharge treatment system for vehicle exhaust gas desulfurization catalyst wastewater

[0044] The equipment in the evaporation concentration system adopts falling film evaporator and forced circulation evaporator to use simultaneously;

[0045] The equipment in the evaporation crystallization system adopts a forced circulation evaporator;

[0046] The equipment in the cooling crystallization system adopts DTB type crystallizer;

[0047] The drying system of the mother liquor adopts a self-spray dryer;

[0048] The evaporative concentration system and evaporative crystallization system adopt mechanical vapor recompression technology;

[0049] The cooling crystallization system adopts an external cooling heat exchanger for cooling.

Embodiment 3

[0050] Embodiment 3: Utilize the treatment system of the present invention to carry out the treatment process of zero discharge of waste water of vehicle tail gas desulfurization catalyst

[0051] The treatment process includes the following steps:

[0052] (1) The production wastewater of the exhaust gas desulfurization catalyst for vehicles is discharged into the regulating tank after the solid suspended matter is removed by the plate-and-frame filter, and the wastewater quality is adjusted. This step makes the wastewater water quality relatively stable;

[0053](2) The waste water regulated by the regulating tank passes through the preheating system to recover the heat of the condensed water in the system, enters the evaporative concentration system for concentration, and the concentrated waste water enters the evaporative crystallization system for treatment;

[0054] (3) The wastewater enters the evaporation and crystallization system and continues to evaporate. The sodiu...

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Abstract

The invention relates to a treatment system and process for zero-discharge wastewater from exhaust gas desulfurization catalysts for vehicles. In the treatment system, the regulating tank system is sequentially connected to a preheating system, an evaporation concentration system, an evaporation crystallization system, a cooling crystallization system, and a mother liquor drying system; the system produces The condensed water returns to the preheating system, and then enters the catalyst production system; the evaporative crystallization system and the cooling crystallization system are equipped with a solid-liquid separation system; The crystallization system flows to the cooling crystallization system, and the nitric acid-rich mother liquor flows back from the cooling crystallization system to the evaporation crystallization system; the cooling crystallization system is equipped with a mother liquor discharge pipe connected to the mother liquor drying system, and the condensed water in the mother liquor drying system returns to the catalyst production system Utilize; and use the treatment system of the present invention to carry out the treatment process of zero discharge of vehicle exhaust gas desulfurization catalyst wastewater. The invention can realize zero discharge and resource utilization of waste water produced by the desulfurization catalyst.

Description

technical field [0001] The invention belongs to the field of waste water treatment, and in particular relates to a waste water zero discharge system and process of a vehicle tail gas desulfurization catalyst. Background technique [0002] With the improvement of my country's automobile exhaust emission standards, vehicle exhaust desulfurization catalysts continue to develop in the automotive industry, and the market demand is increasing. Catalysts will discharge a large amount of salty wastewater during the production process, causing huge pollution to the environment. A lot of resources are wasted. Therefore, it is necessary to properly dispose of the wastewater generated in the production process of the vehicle exhaust desulfurization catalyst, so as to realize zero discharge and resource utilization of the catalyst production wastewater. [0003] Wastewater from the production of exhaust gas desulfurization catalysts for vehicles contains a large amount of sodium sulfate,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/10C01D5/00C01C1/24C02F103/34
CPCC01C1/24C01D5/00C02F1/001C02F1/04C02F1/38C02F9/00C02F2103/34C02F2301/08
Inventor 张自督吕萌刘涛李林李祥宇
Owner 山东瑞琦能源科技有限公司