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Method and device for recovering acetylene from displacement exhaust gas of acetylene generator

A technology for acetylene generators and gas storage devices, which is applied to acetylene generators, parts of acetylene gas generators, chemical instruments and methods, etc., and can solve the problem of poor adsorption effect of adsorbents, failure to meet emission standards, and low pressure of replacement exhaust gas and other problems, to achieve the effect of large operating flexibility, improving the social benefits of the factory, and less corrosiveness of the device

Inactive Publication Date: 2019-12-10
四川开元科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] (2) The displacement exhaust gas pressure is low, usually only a few KPa when it is high, and may even be less than 1KPa when it is low, and there are fluctuations
C 2 h 2 The partial pressure is low, the adsorption effect of conventional adsorbents is very poor, and the new national emission standards cannot be met after treatment.

Method used

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  • Method and device for recovering acetylene from displacement exhaust gas of acetylene generator
  • Method and device for recovering acetylene from displacement exhaust gas of acetylene generator
  • Method and device for recovering acetylene from displacement exhaust gas of acetylene generator

Examples

Experimental program
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Effect test

Embodiment 1

[0047] A method for recovering acetylene from acetylene generator replacement exhaust gas, using the device in the specific embodiment, specifically comprising the following steps:

[0048] The adsorption working pressure of the device is about 0.18Mpa, and the gas volume is 500Nm 3 / h or so, the composition of the exhaust gas replaced by the acetylene generator is shown in Table 1 below:

[0049] Table 1 acetylene generator replacement waste gas composition list

[0050] components C 2 h 2

O 2

N 2

Σ Volume content (%) 15 ～0.5 ～84.5 100

[0051] After the device is in operation, the raw gas enters the gas storage device under normal pressure, and a distance sensor is installed on the top of the gas storage device to monitor the amount of gas storage in real time. The raw gas comes out of the gas storage device and enters the dust removal device to remove dust.

[0052] The raw material gas after dedusting enters the compressor to be ...

Embodiment 2

[0058] A method for recovering acetylene from acetylene generator replacement waste gas, using the device in the specific embodiment, specifically comprising the following steps:

[0059] In this example, the adsorption working pressure of the device is 0.25Mpa, and the gas volume is 1500Nm 3 There are 8 purification towers per hour, and each purification tower is connected in parallel, and each purification tower is connected by a pipeline and a program-controlled valve; each purification tower needs to undergo adsorption and pressure reduction when purifying and recycling the material gas There are six steps: evacuation, evacuation and flushing, pressure boost and final boost. The composition of the waste gas replaced by the acetylene generator is shown in Table 2 below:

[0060] Table 2 acetylene generator replacement waste gas composition list

[0061]

[0062]

[0063] After the device is in operation, the raw gas enters the gas cabinet at about 3Kpa, enters the c...

Embodiment 3

[0067] A method for recovering acetylene from the replacement waste gas of the acetylene generator, adopting the operation steps as described in Example 2, wherein 3 purification towers are configured. The raw material gas composition is as shown in the table of embodiment 2, the working pressure of the purification tower is 0.15Mpa, and the raw material gas volume is about 150Nm3 / h. The gas storage device is an air storage bag with a volume of 100m 3 , The raw material gas enters the air storage bag for buffering under normal pressure, and the dust in the exhaust gas is removed by washing with water, and then pressurized to 0.15Mpa. After being buffered by the buffer tank, it enters the purification tower to recover the effective component acetylene. After being treated by the device of this example, the recovery rate of acetylene in the raw gas reaches 99.9%, and the total non-methane hydrocarbon content in the purified gas is less than 20mg / m 3 .

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Abstract

The invention belongs to the technical field of chemical gas treatment, and specifically relates to a method and device for recovering acetylene from displacement exhaust gas of an acetylene generator. The method comprises the following steps: introducing the displacement exhaust gas of the acetylene generator into a gas storage device for buffering and dust falling, then removing dust through a dust remover, performing pressurization through a compressor, buffering the pressurized exhaust gas in a raw gas buffering tank, introducing the pre-treated exhaust gas into a purification tower for recover acetylene gas in the pre-treated exhaust gas, and performing pumping desorption on the acetylene gas from the bottom of the purification tower through a vacuum pump for recycling after treatmentthrough the purification tower. The recovery rate of the effective component acetylene in the displacement exhaust gas of the acetylene generator in a PVC plant can reach 99.9%, and the content of non-methane total hydrocarbons in the exhaust gas is 20 mg / m<3> or below; and the device and process are safe and reliable, the operation cost is low, and the device and process can be widely applied tothe PVC industry, so that the purposes of low-cost recovery of acetylene and reduction of environmental pollution are achieved.

Description

technical field [0001] The invention belongs to the technical field of chemical gas treatment, relates to the acetylene recovery technology, in particular to a method and a device for recovering acetylene from waste gas replaced by an acetylene generator. Background technique [0002] Acetylene is an important chemical raw material and the basic raw material for vinyl chloride and polyvinyl chloride (PVC). The industrial production methods of acetylene mainly include natural gas cracking method, hydrocarbon cracking method, calcium carbide method and so on. Most domestic PVC production enterprises use calcium carbide method to produce acetylene, and the production process of calcium carbide method is divided into two categories: dry method and wet method. At present, most PVC enterprises adopt the wet process. During the generation of acetylene in the wet process, the feeding of the storage hopper of the generator is completed intermittently. During the feeding process, the...

Claims

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Application Information

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IPC IPC(8): B01D53/047B01D47/00B01D46/02B01D45/12C10H21/00
CPCB01D45/12B01D46/02B01D47/00B01D53/047C10H21/00Y02C20/20Y02P70/10Y02A50/2351
Inventor 唐莉魏玺群王正东赖易伟孟树彬殷小强
Owner 四川开元科技有限责任公司
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