CN202048353U - Buffer tank of pressure swing adsorption (PSA) device utilizing coke oven gas to produce liquefied natural gas (LNG) - Google Patents

Abstract

The utility model discloses a buffer tank of a pressure swing adsorption (PSA) device utilizing coke oven gas to produce liquefied natural gas (LNG), particularly, 100-200 small holes are arranged on an inlet pipeline of a reverse deflation buffer tank, and are uniformly distributed on a pipeline of 4-6m, and the effects that the reverse deflation is uniform and dispersedly enters the reverse deflation buffer tank are obtained. The utility model has the technical scheme that: the buffer tank is opened with reasonable positions and quantity, so the problems of high differential pressure flow velocity and large pipeline noise which are cause by the differential pressure existing in the pressure swing adsorption inverse step and the short inverse step time are solved.

Description

The knock out drum of PSA device among the coke-stove gas system LNG

Technical field

The utility model relates to coke-stove gas system LNG (liquefied natural gas, LNG Liquefied natural gas) project pressure-swing absorption apparatus, especially a kind of improved contrary venting knock out drum.

Background technique

Transformation absorption (Pressure Swing Adsorption) gas separation and purification technique become a kind of production technology of large-size chemical industry and unit process independently, develop rapidly in the sixties in this century.This is owing to the shortage along with world energy sources on the one hand, various countries and every profession and trade are more and more paid attention to the development and utilization of low-grade resource, and the improvement of various countries' environmental pollution requirement is also more and more higher, makes adsorption separation technology come into one's own day by day in Iron And Steel Industry, gas industry, electronics industry, oil and chemical engineering industry; On the other hand, since the sixties, sorbent has also had significant development, as succeeding in developing of the adsorbent of molecular sieve of function admirable, updating of active carbon, activated alumina and silica gel absorber performance, and the invention of extraordinary sorbent of ZSM and NACF, all be that the large-scale adsorptive separation technology of continuous running has been established technical foundation.

Because transformation absorption (PSA) gas separation is to rely on the variation of pressure to realize adsorbing with regeneration, thereby reproduction speed is fast, energy consumption is low, belongs to energy-saving gas separation.And this manufacturing process is simple, stable operation, impurity once can be removed for the mixed gas that contains plurality of impurities and to obtain high purity product.Thereby develop very fastly in the last thirty years, be widely used in the purification of hydrogen in the hydrogen-containing gas, apyrexia drying of the producing of carbon monoxide, carbon dioxide, oxygen, nitrogen, argon gas and hydro carbons, all gases etc. in the mixed gas.And wherein the transformation absorption development of producing pure hydrogen technology especially attracts people's attention.

The transformation absorption principle is to utilize gas with various component discrepant characteristic of the absorbing capacity of same gas composition on sorbent under difference of the adsorptive power on the sorbent and different pressures under the uniform pressure, realizes the separation of a certain component in the mixed gas is purified.Hydrogen is the most weak component of adsorptive power in the conversion gas, and other the strong adsorbent component in the adsorptive pressure down conversion gas is attracted in the solid phase sorbent, obtains weak adsorbent component product hydrogen at the adsorption tower outlet end.By step-down, contrary putting with backwashing manner strong adsorbent component desorption from the sorbent is come out, sorbent obtains regeneration, is used for next adsorption separation process.

The master operation of industry adsorbing separation flow process has: absorption process---virgin gas enters adsorbent bed under normal temperature, high pressure, and sorbent obtains product hydrogen with impurity absorption; The decompression operation---by the drop pressure process of one or many, bed dead space hydrogen is reclaimed; Along the preface of knocking off---obtain the flushing source of the gas of adsorbent reactivation by decompression process forward, promptly be used for other towers are purged; The contrary preface of knocking off---make sorbent obtain partial regeneration against the decompression of absorption direction; Flushing (vacuumizing) operation---reduce impurities partial pressure with product hydrogen flushing (or vacuumizing), make sorbent finish final regeneration; Boosting, operation---boost pressure and product gas lift pressure process by one or many make adsorption column pressure rise to adsorptive pressure, for absorption is next time got ready.

Because there is pressure reduction about 2kg, and the time of converse operation is short in above-mentioned converse operation, so pressure reduction causes gas flow rate height, pipeline noise big.Generally be to be equipped with a knock out drum again, as Chinese patent application (application number: 200520132461.0) disclose a kind of pressure swing adsorption gas separation device, this pressure swing adsorption gas separation device includes adsorption tower, technology knock out drum and valve, make the pressure reduction of gas relax by the technology knock out drum, reduce to impact.

But the knock out drum that how designing a kind of device space that reduces pressure-swing absorber does not increase extra cost again and reach the comfort cushioning effect becomes the problem of those skilled in the art's research.

Summary of the invention

The purpose of this utility model provides the knock out drum of PSA device among a kind of improved coke-stove gas system LNG, realizes that gas evenly distributes, reduces the pressure reduction flow velocity, reduces the pipeline noise.The utility model thes contents are as follows:

The knock out drum of PSA device among a kind of coke-stove gas system LNG, described knock out drum are contrary venting knock out drums, have equally distributed 100～200 apertures on the inlet pipe of described contrary venting knock out drum.

Described inlet pipe is 4～6 meters.

As above give an account of the industrial adsorbing separation flow process that continues, pressure-swing absorber is reduced to the tower internal pressure about 0.05MPa against the absorption direction finishing along after letting slip journey, and the impurity that be adsorbed this moment begins to desorb from sorbent.The contrary stripping gas of putting is put into the contrary knock out drum of putting through program-controlled valve and modulating valve, contrary putting the later stage, and pressure enters the stripping gas mixing tank again less than a small amount of contrary venting of 0.05MPa after pressure regulator valve is adjusted to.

Advantage of the present utility model is as follows: by improving the structure of contrary venting knock out drum, the gas differential pressure flow velocity reduces in above-mentioned contrary venting operation, the pipeline noise reduces, and the people who has improved operating environment feels agreeable degree, has also relaxed the wearing and tearing of device.

Description of drawings

Fig. 1 is the structural representation of embodiment's contrary venting knock out drum.

Symbol description

1, gas access; 2, gas outlet; 3, manhole; 4, sewage draining exit; 5, emptying; 6, inlet pipe.

Embodiment

Below, further specify the utility model with embodiment, but protection domain of the present utility model is not limited in embodiment.The variation and the modification of other that those skilled in the art is made under the situation that does not deviate from spirit of the present utility model and protection domain still are included within the utility model protection domain.

Embodiment 1

Please refer to Fig. 1, omit the overall picture of pressure-swing absorber, extract contrary venting knock out drum wherein, on the inlet pipe 6 of contrary venting knock out drum, be evenly equipped with aperture.

The adsorbing separation operation obtains product after finishing, and waste material is discharged from sewage draining exit 4.Gas product enters gas access 1 through gas outlet 1, makes sorbent obtain partial regeneration against the decompression of absorption direction, enters inlet pipe 6 then.Owing in coke-stove gas system LNG, be evenly equipped with 180 in the hole (100～200 aperture all can) of diameter 25mm on the inlet pipe 6 of the knock out drum of PSA device, therefore the gas differential pressure flow velocity reduces after gas comes out from the inlet pipe 6 in uniform hole, the pipeline noise of converse step preface can descend 8～10 decibels, the people who has improved operating environment feels agreeable degree, has also relaxed the tear strength of device.

Generally speaking, the length of inlet pipe 6 can be 5000mm, and promptly to put in the length of knock out drum be 5000mm in the gas access.

Claims (2)

1. the knock out drum of PSA device among the coke-stove gas system LNG is characterized in that, described knock out drum is contrary venting knock out drum, has equally distributed 100～200 apertures on the inlet pipe of described contrary venting knock out drum.

2. knock out drum according to claim 1 is characterized in that, described inlet pipe is 4～6 meters.

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