CN204746019U - Propylene circulation recovery unit of usefulness is retrieved to tail gas in polypropylene production - Google Patents
Propylene circulation recovery unit of usefulness is retrieved to tail gas in polypropylene production Download PDFInfo
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- CN204746019U CN204746019U CN201520344262.XU CN201520344262U CN204746019U CN 204746019 U CN204746019 U CN 204746019U CN 201520344262 U CN201520344262 U CN 201520344262U CN 204746019 U CN204746019 U CN 204746019U
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Abstract
The utility model discloses a problem that absorption formula propylene recovery device efficiency commonly used is low, effluent concentration is high in retrieving to the tail gas of polypropylene production technology has provided a propylene circulation recovery unit of usefulness is retrieved to tail gas in polypropylene production. The utility model discloses with the gaseous elder generation's process refrigeration circuit cooling liquefaction of propylene, then get into the shell evaporator circulative cooling that adsorption tanks carry out low concentration propylene gas absorption, the reentrant refrigeration circuit of enrichment propenyl benzene gas that the analysis was come out. The utility model discloses when improving device operating efficiency, saved the adsorption tanks size greatly, reduce the loading of adsorbent, the propylene recovery who improves whole recovery unit is simultaneously rateed, reduces tail gas effluent concentration.
Description
Technical field
The utility model relates to a kind of gas circulation and stress device, particularly relates to the propylene circulation and stress device of tail gas recycle in the production of a kind of polypropylene.
Background technology
Polypropylene is formed by propylene addition polymerization, has a large amount of propylene not to be polymerized, thus must be reclaimed in tail gas in polypropylene production process.The propylene administration way that past is commonly used mainly contains: absorption, UF membrane, condensation etc.The enriched gas parsed will the absorption tower in face or refrigeration system be dissolved or liquefaction by past conventional absorption method usually rearward, and thus floor space is large, operating cost is high, and propylene recovery unit efficiency is low simultaneously, concentration of emission is high.
Summary of the invention
Utility model object: in order to overcome the deficiencies in the prior art, the utility model proposes the propylene circulation and stress device of tail gas recycle in the production of a kind of polypropylene, under the effect prerequisite reaching propylene liquefaction, greatly save adsorption tanks size, reduce the loading of adsorbent, improve the propylene recovery rate of whole retracting device simultaneously, reduce exhaust emissions concentration.
Technical scheme: in order to solve the problems of the technologies described above, the utility model provides the propylene circulation and stress device of tail gas recycle in the production of a kind of polypropylene, comprises refrigerating circuit, adsorption treatment path, fluid reservoir and enriched gas circulation line; Described refrigerating circuit comprises the semi-closed screw type refrigerating compressor, oil eliminator, water-cooled condenser, electric expansion valve, the shell and tube evaporator that sequentially connect, and the outlet of electric expansion valve is connected with the import of shell and tube evaporator coolant channel; The outlet of shell and tube evaporator coolant channel is connected with semi-closed screw type refrigerating compressor;
Described adsorption treatment path comprises absorbing unit more than two, often organize absorbing unit to comprise intake valve, resolve valve, adsorption tanks, air bleeding valve, the inlet communication of described exhaust gas entrance and shell and tube evaporator gas passage, the outlet of shell and tube evaporator gas passage is communicated with the air inlet bottom adsorption tanks by intake valve; The gas outlet at adsorption tanks top is communicated with clean gas floss hole by air bleeding valve; Also be connected with the import of resolving valve between air inlet bottom the outlet of described intake valve and adsorption tanks, the outlet of resolving valve is by the inlet communication of enriched gas circulation line and shell and tube evaporator gas passage; Described enriched gas circulation line is provided with vavuum pump, air accumulator and circulation pneumatic operated valve successively along gas flow;
The liquid outlet of described shell and tube evaporator gas passage is connected with fluid reservoir, is provided with propylene liguid outlet bottom fluid reservoir.
As preferably, described propylene circulation and stress device also comprises switch board, and described switch board is electrically connected with described vavuum pump and described circulation pneumatic operated valve respectively.
As preferably, described adsorption treatment path comprises two groups and is set up in parallel alternately for the absorbing unit adsorbed and resolve.
As preferably, the outer wall of described semi-closed screw type refrigerating compressor is also enclosed with cooling water cover.
As preferably, the adsorbent placed in described adsorption tanks inner chamber is column-shaped active carbon adsorbent.
As preferably, described semi-closed screw type refrigerating compressor adopts fire-proof motor and anti-explosion terminal box.
The utility model is the problem that absorption type propylene recovery unit efficiency is low, concentration of emission is high conventional in the tail gas recycle for PP Production Technology, proposes the propylene circulation and stress device of tail gas recycle in the production of a kind of polypropylene.Existing absorption type propylene recovery principle is improved, by propylene gas first through the refrigerating circuit cooling liquid of-80 DEG C of evaporating temperatures can be provided, then enter adsorption tanks and carry out the absorption of low concentration propylene gas, the enrichment propylene gas parsed enters the shell and tube evaporator circulating cooling of refrigerating circuit again.The utility model device eliminate adsorption treatment after enriched gas separately prepare cold investment, but utilize refrigerating circuit by the liquefaction of propylene gas major part, a small amount of residual air just enters absorbing unit, the enriched gas parsed returns the shell and tube evaporator circulating cooling of refrigerating circuit, so greatly save adsorption tanks size, reduce the loading of adsorbent, improve the propylene recovery rate of whole retracting device simultaneously, reduce exhaust emissions concentration.
Beneficial effect: 1, the utility model utilizes can provide the refrigerating circuit of-80 DEG C of evaporating temperatures by the liquefaction of propylene gas major part, a small amount of residual air just enters absorbing unit, the enriched gas parsed returns the shell and tube evaporator circulating cooling of the refrigerating circuit of front end, make full use of the feature that condensation method is applicable to the high operating mode of density of propylene, absorption method is applicable to the low operating mode of density of propylene, give full play to respective advantage, improve device operation efficiency; Under the effect prerequisite reaching propylene liquefaction, greatly save adsorption tanks size, reduce the loading of adsorbent, improve the propylene recovery rate of whole retracting device simultaneously, reduce exhaust emissions concentration; 2, shell and tube evaporator is adopted to guarantee that cold-producing medium cools propylene gas and makes propylene gas efficient liquefaction; 3, further, adopt 2 groups of absorbing units be set up in parallel, 2 groups of absorbing units, alternately for absorption and dissection process, improve efficiency; 4, further, switch board controlled circulation pneumatic operated valve start-stop synchronous with vavuum pump, can make the gas after adsorption treatment enter refrigerating circuit smoothly.
Accompanying drawing explanation
Fig. 1 is the propylene circulation and stress apparatus structure schematic diagram of tail gas recycle during polypropylene described in the utility model is produced.
Detailed description of the invention
Below by accompanying drawing, technical solutions of the utility model are described in detail, but protection domain of the present utility model is not limited to described embodiment.
Embodiment 1: as shown in Figure 1, the propylene circulation and stress device of tail gas recycle in polypropylene production described in the present embodiment, comprise refrigerating circuit, adsorption treatment path, fluid reservoir and enriched gas circulation line, described refrigerating circuit comprises the semi-closed screw type refrigerating compressor 1, oil eliminator 2, water-cooled condenser 3, electric expansion valve 4, the shell and tube evaporator 5 that sequentially connect, and the outlet of electric expansion valve 4 is connected with the import of shell and tube evaporator 5 coolant channel; The outlet of shell and tube evaporator 5 coolant channel is connected with semi-closed screw type refrigerating compressor 1;
Described adsorption treatment path comprises 2 groups and is set up in parallel alternately for the absorbing unit adsorbed and resolve; First group of absorbing unit comprises adsorption tanks A6, intake valve A601, resolves valve A602, air bleeding valve A603, described exhaust gas entrance is connected with the import of shell and tube evaporator 5 gas passage, the outlet of shell and tube evaporator 5 gas passage is connected with the air inlet bottom adsorption tanks A6 by intake valve A601, the gas outlet at adsorption tanks A6 top is connected with clean gas floss hole by air bleeding valve A603, is also connected with the import of resolving valve A602 between the air inlet bottom the outlet of described intake valve A601 and adsorption tanks A6; Second group of absorbing unit comprises adsorption tanks B7, intake valve B701, resolves valve B702, air bleeding valve B703, the outlet of described shell and tube evaporator 5 gas passage is connected with the air inlet bottom adsorption tanks B7 by intake valve B701, the gas outlet at adsorption tanks B7 top is connected with clean gas floss hole by air bleeding valve B703, is also connected with the import of resolving valve B702 between the air inlet bottom the outlet of described intake valve B701 and adsorption tanks B7; The outlet of resolving valve A601 is connected with the import of shell and tube evaporator 5 gas passage by vavuum pump 9, air accumulator 10, circulation pneumatic operated valve 11 with the outlet of resolving valve B701.
The quantity of the utility model absorbing unit is also not only confined to two groups, also can be 3 groups even more than 3 groups, and while wherein a part carries out adsorption treatment, another part carries out dissection process; When absorbing unit is 3 groups, can while two groups of absorbing units carry out adsorbing, one group of absorbing unit is resolved, and vice versa.
Embodiment 2: substantially identical with embodiment 1 structure, something in common is not repeated, and difference is: described propylene circulation and stress device also comprises switch board 12, and described switch board 12 is electrically connected with vavuum pump 9 and circulation pneumatic operated valve 11 respectively.
As shown in Figure 1 polypropylene produce in the propylene circulation and stress device schematic diagram of tail gas recycle, comprise refrigerating circuit (being made up of low temperature Semi-closed screw refrigerating compressor 1, oil eliminator 2, water-cooled condenser 3, electric expansion valve 4, shell and tube evaporator 5), adsorption tanks A6, adsorption tanks B7, circulation pneumatic operated valve 11, vavuum pump 9, air accumulator 10, fluid reservoir 8, switch board 12.Collect the propylene gas the come pipeline through DN250 bore at the shell and tube evaporator (evaporator inlet-outlet is DN250) of refrigerating circuit, liquid is condensed into after being cooled to uniform temperature by-80 DEG C of low-temperature refrigerants, and concentrate on bottom shell and tube evaporator, enter by the pipeline of DN50 the object that fluid reservoir reaches recovery after confluxing, enter adsorption tanks A6 again from the air mixture containing a small amount of propylene that the outlet of shell and tube evaporator gas passage is next to adsorb, adsorb saturated rear by closing intake valve A601, open intake valve B701 and change to adsorption tanks B7 continuous adsorption (adsorption tanks entrance and exhaust are DN250), adsorption tanks A6 then enters parse state, the enrichment propylene gas parsed by vavuum pump 9 leads to air accumulator 10(gateway by DN80 enriched gas circulation line and is DN80), the import department being communicated to shell and tube evaporator 5 gas passage of refrigerating circuit again by air accumulator 10 through circulation pneumatic operated valve 11 carries out circulating cooling together with device portal waste gas, switch board 12 realizes the synchronous start-stop of the vavuum pump 9 of circulation pneumatic operated valve 11 and parsing by PLC.Because vavuum pump is in unlatching or when cutting out, air-flow is unstable, and air accumulator can play the effect of buffering.
Refrigerating circuit comprises explosion-proof semi-closed screw type refrigerating compressor, oil eliminator, water-cooled condenser, electric expansion valve, the shell and tube evaporator that can provide-80 DEG C of evaporating temperatures.
By low temperature refrigeration circuit being placed in the front end of adsorption treatment path, make full use of the feature that existing condensation method is applicable to the high operating mode of density of propylene, absorption method is applicable to the low operating mode of density of propylene, give full play to the respective advantage of existing condensing recovery system and absorption type recovery system, improve device operation efficiency; Under the effect prerequisite reaching propylene liquefaction, greatly save adsorption tanks size, reduce the loading of adsorbent, improve the propylene recovery rate of whole retracting device simultaneously, reduce exhaust emissions concentration.
As mentioned above, although represented with reference to specific preferred embodiment and described the utility model, it shall not be construed as the restriction to the utility model self.Under the spirit and scope prerequisite of the present utility model not departing from claims definition, various change can be made in the form and details to it.
Claims (6)
1. polypropylene produce in the propylene circulation and stress device of tail gas recycle, it is characterized in that: comprise refrigerating circuit, adsorption treatment path, fluid reservoir and enriched gas circulation line; Described refrigerating circuit comprises the semi-closed screw type refrigerating compressor, oil eliminator, water-cooled condenser, electric expansion valve, the shell and tube evaporator that sequentially connect, and the outlet of electric expansion valve is connected with the import of shell and tube evaporator coolant channel; The outlet of shell and tube evaporator coolant channel is connected with semi-closed screw type refrigerating compressor;
Described adsorption treatment path comprises absorbing unit more than two, often organize absorbing unit to comprise intake valve, resolve valve, adsorption tanks, air bleeding valve, the inlet communication of waste propylene gas entrance and shell and tube evaporator gas passage, the outlet of shell and tube evaporator gas passage is communicated with the air inlet bottom adsorption tanks by intake valve; The gas outlet at adsorption tanks top is communicated with clean gas floss hole by air bleeding valve; Also be connected with the import of resolving valve between air inlet bottom the outlet of described intake valve and adsorption tanks, the outlet of resolving valve is by the inlet communication of enriched gas circulation line and shell and tube evaporator gas passage; Described enriched gas circulation line is provided with vavuum pump, air accumulator and circulation pneumatic operated valve successively along gas flow;
The liquid outlet of described shell and tube evaporator gas passage is connected with fluid reservoir, is provided with propylene liguid outlet bottom fluid reservoir.
2. polypropylene according to claim 1 produce in the propylene circulation and stress device of tail gas recycle, it is characterized in that: described propylene circulation and stress device also comprises switch board, described switch board is electrically connected with described vavuum pump and described circulation pneumatic operated valve respectively.
3. polypropylene according to claim 1 produce in the propylene circulation and stress device of tail gas recycle, it is characterized in that: described adsorption treatment path comprises two groups and is set up in parallel alternately for the absorbing unit adsorbed and resolve.
4. polypropylene according to claim 1 produce in the propylene circulation and stress device of tail gas recycle, it is characterized in that: the outer wall of described semi-closed screw type refrigerating compressor is also enclosed with cooling water cover.
5. polypropylene according to claim 1 produce in the propylene circulation and stress device of tail gas recycle, it is characterized in that: the adsorbent placed in described adsorption tanks inner chamber is column-shaped active carbon adsorbent.
6. polypropylene according to claim 1 produce in the propylene circulation and stress device of tail gas recycle, it is characterized in that: described semi-closed screw type refrigerating compressor adopts fire-proof motor and anti-explosion terminal box.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520344262.XU CN204746019U (en) | 2015-05-25 | 2015-05-25 | Propylene circulation recovery unit of usefulness is retrieved to tail gas in polypropylene production |
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| CN201520344262.XU CN204746019U (en) | 2015-05-25 | 2015-05-25 | Propylene circulation recovery unit of usefulness is retrieved to tail gas in polypropylene production |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108888982A (en) * | 2018-06-29 | 2018-11-27 | 合肥通用机械研究院有限公司 | A kind of polymarization method for prodcing polyacrylates gas recovery gear and recovery process |
| CN109405412A (en) * | 2017-08-16 | 2019-03-01 | 日照广信化工科技有限公司 | A kind of processing method and its deep condensation device of the fixed gas suitable for batch polypropylene plant production technology |
-
2015
- 2015-05-25 CN CN201520344262.XU patent/CN204746019U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109405412A (en) * | 2017-08-16 | 2019-03-01 | 日照广信化工科技有限公司 | A kind of processing method and its deep condensation device of the fixed gas suitable for batch polypropylene plant production technology |
| CN108888982A (en) * | 2018-06-29 | 2018-11-27 | 合肥通用机械研究院有限公司 | A kind of polymarization method for prodcing polyacrylates gas recovery gear and recovery process |
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