Glyphosate mother liquor resource utilization system

Abstract

The invention discloses a glyphosate mother liquor resource utilization system, and relates to the environmental protection technical field of treating the three wastes of waste liquid, waste gas and solid waste. The system mainly comprises a mother liquor concentration system, a thermal oxidation reaction system, a residual heat recovery system, a flue gas environment-friendly treatment system, and a solid product recovery system. The mother liquor concentration system is respectively communicated with the thermal oxidation reaction system and the residual heat recovery system. The thermal oxidation reaction system is communicated with the residual heat recovery system and the solid product recovery system. The residual heat recovery system is communicated with the flue gas environment-friendly treatment system and the solid product recovery system. The flue gas environment-friendly treatment system is communicated with the solid product recovery system. With the system provided by the invention, chemical engineering waste liquid can be treated with an environment-friendly manner. The chemical engineering waste can be subjected to a thermal oxidation reaction, such that valuable chemical engineering products can be produced, and a purpose of resource utilization is achieved. Also, waste heat is fully utilized, such that energy can be saved.

Description

technical field [0001] The invention relates to a technology for reducing, harmless, resourceful and environmentally friendly treatment of mother liquor containing high concentrations of organic phosphorus, nitrogen and salt in the pesticide industry, and in particular to a resource utilization system for glyphosate mother liquor, which belongs to The field of environmental protection technology for the treatment of the "three wastes" of waste liquid, waste gas and waste solid. Background technique [0002] During the glyphosate production process, a large amount of production wastewater containing triethylamine, glyphosate, glycine, phosphorous acid, glyphosate, methanol, formaldehyde and high-concentration salt is produced. Domestic glyphosate manufacturers mainly concentrate and remove part of the mother liquor Salt, and then add glyphosate raw powder to prepare 10% glyphosate water solution for sale. Due to the long-term application of 10% water agent containing a large...

AI Technical Summary

Problems solved by technology

However, the two-stage incineration device and incineration system described in this patent has the following disadvantages: (1) The outlet of the vertical furnace is directly connected to the secondary combustion settling chamber, and a large amount of salt-containing solid particles carried in the flue gas are heated again, making it When it becomes molten, the settled molten salt-containing solid particles will block the slag discharge hole of the secondary combustion settling chamber, and the molten salt-containing solid particles brought into the heat exchange unit will stick to the heat exchange tube, resulting in The thermal efficiency is reduced, and even the flue gas channel is blocked; (2) The front of the scale circulating grate is equipped with a hopper, which cannot return the unburned solid particles containing salt to the horizontal furnace for further incineration. The impurities of chemical raw materials produced during the incineration process (3) The waste liquid atomizing spray gun is a two-fluid structure atomizing gun, and the outer layer is a compressed air pipeline. According to experience, the glyphosate mother liquor has a high viscosity at room temperature, and it needs to be heated to reduce its viscosity coefficient, while compressed air is mostly At room temperature, using compressed air as the atomization medium will cool the glyphosate mother liquor, the viscosity coefficient will increase, the nozzle will be blocked, and the atomization effect will be affected, and the atomization effect is an important factor affecting the combustion efficiency; (4) vertical furnace , The horizontal furnace and the secondary combustion settling chamber do not limit the incineration temperature. From the collection of solid materials, it can be seen that although it is two-stage combustion, it is basically low-temperature combustion, and the organic matter in the waste liquid cannot be completely incinerated. It also cannot meet the national "Pollution Control Standards for Hazardous Waste Incineration"; (5) The glyphosate mother liquor sprayed into the vertical furnace through the waste liquid atomization spray gun has not been concentrated, and the glyphosate mother liquor contains a large amount of water, which makes this A large amount of auxiliary fuel is consumed for part of the water to reach the combustion temperature of the furnace, resulting in a waste of energy

However, the method and device for producing sodium pyrophosphate by constant-temperature calcination of glyphosate mother liquor described in this patent has the following disadvantages: (1) The three inlets of the incinerator are respectively glyphosate mother liquor pipeline and combustion air from bottom to top Pipelines and natural gas pipelines are all supplied in a centralized manner, and the combustion area is relatively concentrated, resulting in excessive local temperature, which will generate more thermal NOx, and there is no denitrification device at the rear, and the environmental protection is not up to standard; (2) The three parts of the incinerator The two inlets from bottom to top are glyphosate mother liquor pipeline, combustion air pipeline and natural gas pipeline, all of which are supplied in a centralized manner, and the combustion area is relatively concentrated, resulting in excessive local temperature and uneven temperature field, so that the glyphosate mother liquor cannot Complete combustion, there are organic residues on the surface of sodium pyrophosphate solid particles, and the purity of sodium pyrophosphate is low; (3) The glyphosate mother liquor is directly sprayed into the furnace through a booster pump, and the droplet diameter is relatively large, so the evaporation of the glyphosate mother liquor, The decomposition and oxidation time will increase correspondingly, which is not conducive to the complete incineration of glyphosate mother liquor; (4) The salt produced during the combustion process in the incinerator will settle under the action of gravity and then sent to the slag remover, because the salt produced during the combustion process If it is in a molten state, it will stick to the internal transmission device of the slag remover when it enters the slag remover, which will eventually cause the blockage of the slag remover; (5) There are two combustion chambers in the incinerator, and the reaction temperature in the second combustion chamber is controlled at 900 ~ At 1000°C, the molten salt enters the cyclone dust collector along with the flue gas, and the molten salt will bond along the circumferential direction of the cyclone dust collector, eventually blocking the cyclone dust collector; Ideally, unseparated molten salt is likely to block the rear heating surface and flue; (7) The glyphosate mother liquor sprayed into the vertical furnace through the waste liquid atomization spray gun has not been concentrated, and the glyphosate mother liquor contains A large amount of water, so that this part of water reaches the combustion temperature of the furnace needs to consume a large amount of auxiliary fuel, resulting in a waste of energy; (8) There are 3 cooling chambers in the waste heat boiler, and the cooling chambers are generally cavities surrounded by membrane water walls Type heating surface, mainly based on radiation heat transfer, the heat transfer effect is good when the flue gas temperature is high, and the heat transfer effect is not good when the flue gas temperature is low, it is necessary to increase the heating surface to reduce the flue gas temperature, which increases the initial investment cost of the equipment; (9) The induced draft fan is arranged after the water washing spray tower, which increases the load of the induced draft fan and increases the power consumption

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