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Method for reducing emission and recycling atmospheric pollutants in emptying and cleaning process of chemical plant installations

An air pollutant and chemical technology, applied in the field of cleaner production and environmental protection, can solve the problems of large instantaneous discharge flow, long process time, loss of material resources, etc. The effect of steaming tower time and increasing transfer rate

Active Publication Date: 2014-08-13
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, in the above scenario, the cleaning process of the device loses material resources on the one hand, and causes air pollution emissions on the other hand.
At present, there are also some newly-built devices that have condensing devices installed in the purge pipeline to condense the steam purge exhaust and recover some materials. Gas is used for purging. Since there is no macroscopic air flow inside the equipment in most cases, the mass transfer rate is also low, and the process takes a long time. In addition, the instantaneous discharge flow rate during the step-down and exhaust process is large, and a large-scale condensing device is required. In order to meet the demand for high-efficiency condensation, the condensing system equipped with the existing production equipment usually cannot meet the required load requirements, and the new large-scale condensing equipment is difficult to implement due to technical and economic issues such as being unusable and idle.

Method used

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  • Method for reducing emission and recycling atmospheric pollutants in emptying and cleaning process of chemical plant installations

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Steam Purging and Recovery of Petroleum Primary Distillation Tower

[0026] 1) For an initial distillation tower system of a certain petroleum refining (with an inner volume of about 3000m 3 ) First, use valves or blind flanges to isolate the feed and discharge pipes from the outside air.

[0027] 2) Through the temporary pipeline inlet interface 4 of the circulation loop at the top and bottom of the device and the temporary pipeline outlet interface 5 of the circulation loop and the peripheral temporary pipeline 6 and the circulation loop fan power system 7 (rated flow rate 15000m 3 / h) and so on constitute a closed circulation pipeline system.

[0028] 3) Connect the condensing system 10 and the condensing circuit power fan 11 at the inlet port 8 of the bypass condensing system pipeline and the outlet port 9 of the bypass condensing system upstream and downstream of the closed circulation pipeline system as the air flow power system (rated flow rate 6000m 3 / h).

...

Embodiment 2

[0035] Steam purge recovery of toluene storage tank

[0036] 1) For a volume of 500m 3 After the toluene storage tank system completes the material return work, the feed and discharge pipelines are first isolated from the outside air by closing the valve or installing a blind flange.

[0037] 2) Through the temporary pipeline inlet interface 4 of the circulation loop at the top and bottom of the device and the temporary pipeline outlet interface 5 of the circulation loop and the peripheral temporary pipeline 6 and the circulation loop fan power system 7 (rated flow rate 3000m 3 / h) and so on constitute a closed circulation pipeline system.

[0038] 3) Connect the condensing system 10 and the condensing circuit power fan 11 at the inlet port 8 of the bypass condensing system pipeline and the outlet port 9 of the bypass condensing system upstream and downstream of the closed circulation pipeline system as the air flow power system (flow rate 1000m 3 / h).

[0039] 4) Connect t...

Embodiment 3

[0045] A method for reducing and recovering air pollutants during the venting and cleaning process of a chemical synthesis unit. The system structure it adopts is as follows: figure 1 As shown, a pipeline is erected outside the device 1 to be cleaned to form a circulating gas circuit, and the method of steam cycle heating, gasification and integrated split condensation is used to improve the efficiency of steam purging, mass transfer and heat transfer and reduce the load required by the condensing equipment, so that the liquid It is the organic matter remaining after the material is returned from the form recovery unit.

[0046] The method specifically includes the following steps:

[0047] (1) Utilize the blind flange 2 of the import and export pipeline and the valve 3 of the import and export pipeline to isolate all the pipes and passages connected to the outside of the device to be cleaned, and then pass through the temporary pipeline inlet interface 4 of the circulation lo...

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Abstract

The invention relates to a method for reducing emission and recycling atmospheric pollutants in emptying and cleaning process of chemical plant installations. A pipeline is spanned outside an installation to be cleaned to form a circulating gas circuit; and the mass transfer and heat transfer efficiency of steam blowing are improved and loads needed by condensing equipment are reduced in such a manner of circulating steam heating gasification integrated shunting and condensation; and therefore, organic matters left by the installation after return of material is recycled in liquid form. The method provided by the invention greatly reduces the requirement of the processing capability of the condensation system, realizes emission reduction and recycling of the atmospheric pollutants in the emptying and cleaning process of the chemical plant installations at low cost, and simultaneously solves the problem of direct emission of partial installations in the blowing process due to lack of the recycling device.

Description

technical field [0001] The invention relates to the fields of clean production and environmental protection, and to clean production, resource recovery, and pollution reduction in industries such as petrochemical, chemical, chemical, pharmaceutical, organic materials, oil products, etc. A method for reducing and recovering air pollutants during the vent cleaning process. Background technique [0002] All kinds of devices that use organic matter as materials, such as chemical reaction, separation and storage and transportation devices, etc., need to carry out system maintenance and maintenance after a period of operation. The usual steps are parking, material return, cleaning, venting, internal inspection, and device inspection. maintenance etc. After the liquid material is returned, there will inevitably be some residual materials in the device due to adhesion and other reasons. For packed towers or catalytic, heat exchange and other devices, the residual amount of organic ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D5/00
Inventor 羌宁
Owner TONGJI UNIV