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Pre-coating material efficiency increasing and consumption reducing method and pre-coating material efficiency increasing and consumption reducing apparatus in MTO quenching water pre-coating pressure filtration separation system

A separation system and quench water technology, which are applied in separation methods, filtration separation, chemical instruments and methods, etc., can solve the problems of high maintenance costs, failure to meet industrial requirements, and high construction costs, reduce industrial water consumption, and increase utilization times. , the effect of reducing the solid content

Inactive Publication Date: 2018-07-27
SHANGHAI HUACHANG ENVIRONMENT PROTECTION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that the sintered metal has small pores, the catalyst particles in the quenching water are easy to block the pores, and the use of chemical cleaning produces a large amount of chemical waste liquid. The post-treatment cost is high, and it will corrode the filter element, which needs to be replaced regularly, high cost, and high maintenance cost.
CN 203990086 discloses a method of pre-separating larger particles in quenching water by filtration, and the separated liquid continues to enter the first-stage and second-stage cyclones for separation. The disadvantage is that it is limited by the separation accuracy of the cyclone. The separation effect of the catalyst particles is not good, and it cannot meet the industrial requirements
[0006] Aiming at the problem of high catalyst solid content in the quenching water that needs to be solved urgently, a two-stage cyclone separation process of one-stage clarification and two-stage concentration is designed in the prior art. However, if the concentrated suspension discharged from the underflow of the two-stage cyclone is directly If it is lost, it will cause a lot of waste of catalysts, water resources and damage the environment

Method used

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  • Pre-coating material efficiency increasing and consumption reducing method and pre-coating material efficiency increasing and consumption reducing apparatus in MTO quenching water pre-coating pressure filtration separation system
  • Pre-coating material efficiency increasing and consumption reducing method and pre-coating material efficiency increasing and consumption reducing apparatus in MTO quenching water pre-coating pressure filtration separation system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Process flow:

[0058] Such as figure 2 shown. In the initial stage of filtration, 39 μm diatomite was selected as the filter aid and added to the filter aid mixing tank. When the mass concentration of the precoat suspension was controlled at 1%, it was pressurized to 0.3 MPa by the filter aid pump and injected into the filter press. In the pre-coating unit chamber, a layer of pre-coating with a thickness of 7mm is formed on the filter cloth of the filter press before filtration, the amount of pre-coating agent is 13kg / h, and the pore size of the selected filter cloth is 400 mesh. The solid content of the catalyst suspension concentrated by the secondary cyclone is 30000mg / L, and the particle size of the catalyst is 3μm. After entering the filter press, the flow rate of the concentrated suspension is kept at 4m 3 / h, filter on the pre-coating; in the early stage of filtration, the filter cake is first returned to the filter aid mixing tank, mixed with the filter aid ...

Embodiment 2

[0062] Process flow:

[0063] Such as figure 2 shown. In the initial stage of filtration, 50 μm diatomite was selected as the filter aid and added to the filter aid mixing tank. When the mass concentration of the precoat suspension was controlled at 1%, it was pressurized to 0.3 MPa by the filter aid pump and injected into the filter press. Pre-coating unit chamber, before filtering, a layer of pre-coating layer is formed on the filter cloth of the filter press with a thickness of 5mm, the amount of pre-coating agent is 11kg / h, and the pore size of the selected filter cloth is 400 mesh; after being concentrated by the secondary cyclone The solid content of the catalyst suspension is 30125mg / L, and the particle size of the catalyst is 3μm. After entering the filter press, the flow rate of the concentrated suspension is kept at 4m 3 / h, filter on the pre-coating; in the early stage of filtration, the filter cake is first returned to the filter aid mixing tank, mixed with the ...

Embodiment 3

[0067] Process flow:

[0068] Such as figure 2shown. In the initial stage of filtration, 39 μm diatomite was selected as the filter aid and added to the filter aid stirring tank. When the mass concentration of the precoat suspension was controlled to be 3%, the filter aid pump was pressurized to 0.3 MPa and injected into the precoating tank of the filter press. Coating unit chamber, before filtering, a layer of pre-coating layer is formed on the filter cloth of the filter press with a thickness of 3mm, the amount of pre-coating agent is 7kg / h, and the pore size of the selected filter cloth is 400 mesh; after being concentrated by the secondary cyclone The solid content of the catalyst suspension is 29132 mg / L, and the particle size of the catalyst is 3 μm. After entering the filter press, the flow rate of the concentrated suspension is kept at 4 m 3 / h, filter on the pre-coating; in the early stage of filtration, the filter cake is first returned to the filter aid stirring ...

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Abstract

The present invention relates to a pre-coating material efficiency increasing and consumption reducing method and a pre-coating material efficiency increasing and consumption reducing apparatus in anMTO quenching water pre-coating pressure filtration separation system, and provides a pre-coating material efficiency increasing and consumption reducing method in an MTO quenching water pre-coating pressure filtration separation system, wherein the pre-coating material efficiency increasing and consumption reducing method comprises that (i) an auxiliary filtration agent is added to an auxiliary filtration agent stirring tank (16), the obtained material is fed into to the pre-coating unit chamber of a filter press (10), and a pre-coating is formed on a filtration cloth; (ii) a catalyst suspension concentrated by a two-stage cyclone (9) enters the filter press (10), and filtering is performed on the pre-coating; (iii) at the early stage of filtration, the filter cake returns to the auxiliary filtration agent stirring tank (16), and is mixed with the auxiliary filtration agent so as to be used as the new auxiliary filtration agent, and the new auxiliary filtration agent enters the next cycle of the auxiliary filtration process; (iiii) the filtration specific resistance of the pre-coating is increased after the cycle is performed for a certain time, and when the pressure of a filtrateinlet is increased to achieve a set value, a material discharge port is switched to a filter cake collection tank (12) so as to discharge the filter cake. The invention further provides a pre-coatingmaterial efficiency increasing and consumption reducing apparatus in an MTO quenching water pre-coating pressure filtration separation system.

Description

technical field [0001] The disclosure belongs to the field of process water treatment and reuse in the process of coal chemical industry, and relates to a method for improving efficiency and reducing consumption of pre-coating in an MTO (methanol-to-olefin) quenching water pre-coating filter separation system, which can realize pre-coating and pre-coating water addition Reuse, reduce the amount of discharged solid waste, significantly reduce the solid content of the effluent filtrate, and reduce costs. It also relates to a device for the method. Background technique [0002] In the MTO industrial production, the reaction gas produced from the reactor carries catalyst particles. After being separated by the three-stage cyclone separator, a part of the catalyst will be entrained in the reaction gas and enter the quenching tower and the water washing tower, and then pass through the quenching tower and the water washing tower. After cooling and washing, the catalyst particles ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D37/02C07C1/20C07C11/02
CPCB01D37/025C07C1/20C07C11/02
Inventor 吕文杰郭丹王飞陈建琦王劲松桑伟迟汪华林
Owner SHANGHAI HUACHANG ENVIRONMENT PROTECTION
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