CN2310062Y

CN2310062Y - Vaporation for carbon dioxide purifying recovery device

Info

Publication number: CN2310062Y
Application number: CN96241916U
Authority: CN
Inventors: 景瑞芬; 胡清成; 贾焕云; 李立欣
Original assignee: CHINA UNIVERSAL PETROCHEMICAL MECHANICAL ENGINEERING CORP
Current assignee: CHINA UNIVERSAL PETROCHEMICAL MECHANICAL ENGINEERING CORP
Priority date: 1996-11-04
Filing date: 1996-11-04
Publication date: 1999-03-10
Anticipated expiration: 2006-11-04

Abstract

The utility model relates to a vaporizing device for CO2 purifying recovery devices. The utility model solves the problems of vaporizing pressure and stable temperature. The utility model is composed of a vaporizer, a pipeline pump and a pipeline. The utility model is characterized in that the vaporizer adopts a water bathroom structure; the barrel body of the vaporizer is provided with a partition plate and is fully poured with water; the barrel body is divided into a front part and a back part by the partition plate; the back part is provided with a steam heating pipe, and the front part is provided with a CO2 U-shaped pipe; the steam heating pipe and the CO2 U-shaped pipe are immersed in water. The utility model is used for CO2 purifying recovery devices.

Description

Vapourizing unit in the purifying carbon dioxide retrieving arrangement

The utility model relates to gas concentration unit, refers in particular to the vapourizing unit in a kind of purifying carbon dioxide retrieving arrangement.

Existing CO ₂Refining plant floor plan such as Fig. 1 in the purification recovery device, it is made up of 27,28, two drying towers of 26, two adsorption towers of 24,25, one electric heaters of two air pumps 29,30.Wherein 27,28 and two drying towers 29,30 of two adsorption towers all are installed in parallel, a job, and a regeneration guarantees non-stop

run.Adsorption tower

27,28, drying tower 29,30 all adopts and adds regenerated with hot air.During regeneration, two

air pumps

24,25 deliver air to electric heater 26 and are heated to about 300 ℃, entering into needs in the regenerated adsorption tower (or drying tower), sorbent material (or siccative) in the heating adsorption tower (or drying tower), peculiar smell of separating out or moisture are taken out of outside the tower with air-flow, reach the regeneration purpose.

There are some shortcomings in this refining plant: 1. equipment is many, has seven, and correspondingly cost improves, and floor space is big; 2. because use air regenesis,, finally influence finished product CO so the air admission device brings difficulty to purification ₂Quality; 3. because air heats in electric heater earlier, and valve enters adsorption tower (or drying tower) by the road again, so need select high temperature valve (also need be incubated) for use, so not only cost height, and thermosteresis is big, power consumption is many, the working cost height.Remove

adsorption tower

27,28, outside the drying tower 29,30, wherein, vapourizing unit also is one of key equipment, and its main shortcoming is liquefaction CO ₂Earlier air and electrically heated are used in decompression again, make it vaporization, cause decompression after, pressure, temperature instability, poor reliability.

The purpose of this utility model is to existing CO ₂Purification recovery device improves, thereby all vapourizing units more stably of a kind of pressure for vaporization, temperature are provided.

The purpose of this utility model is achieved in that the vapourizing unit in the purifying carbon dioxide retrieving arrangement, and it is made up of vaporizer, in-line pump and pipeline, it is characterized in that: vaporizer adopts the water-bath cell structure; Be provided with dividing plate in the cylindrical shell of vaporizer and fill water, two portions before and after with dividing plate cylindrical shell being divided into are provided with steam heating tube in the rear portion, and another part is provided with CO ₂U type pipe, and all be immersed in the water.

Above-mentioned design constitutes circulation with the water in the front and rear and establishes by pipeline connection with in-line pump.Thereby reach all effects more stably of pressure for vaporization, temperature.

Below by drawings and Examples the utility model is described further again.

Fig. 1 is the refining plant floor plan synoptic diagram in the existing purifying carbon dioxide retrieving arrangement;

Fig. 2 is the purifying carbon dioxide device floor plan synoptic diagram in the utility model;

Fig. 3 is the carbonic acid gas sump assemblies synoptic diagram in the utility model;

Fig. 4 is the vapourizing unit synoptic diagram in the utility model;

Fig. 5 is the carbon dioxide condensing device synoptic diagram in the utility model:

Fig. 6 is the washing tower synoptic diagram in the utility model;

Fig. 7 is a process flow diagram of the present utility model;

As shown in Figure 2, the purifying carbon dioxide device in the utility model only is made up of 7,8 and two drying towers 9,10 of two adsorption towers and all is connected in parallel; Wherein adsorption tower 7,8 is respectively equipped with steam gangway A, B and C, D for adopting steam regeneration.During regeneration, as long as steam is introduced in adsorption tower 7 or 8, the sorbent material in the steam heating adsorption tower, the peculiar smell of separating out is discharged outside the tower with air-flow; Drying tower adopts internal heating regeneration, is provided with heating unit E, F in drying tower inside, during regeneration, and a part of CO that an electric heating element heating shunts out from finished product gas ₂, this part CO of heating ₂Gas reheat siccative, the moisture content of separating out is taken out of outside the tower with air-flow.

As shown in Figure 3, CO of the present utility model ₂Sump assemblies is by little unit cooler 14, pressure compensator 15 and CO ₂Receiver 16 is formed, wherein, and CO ₂Be provided with cooling coil 31 in the receiver 16, pressure compensator 15 is made of electrical heating element 34, U type pipe 33.With general CO ₂The sump assemblies difference is at CO ₂Increase cooling coil 31 in the receiver 16, be equipped with little unit cooler 14, worked as CO ₂(as in summer, ambient temperature height, external heat import into and cause CO the receiver superpressure ₂Temperature raises in the receiver, and pressure also rises simultaneously) general CO ₂Receiver can only emptying, and the utility model can start little unit cooler 14 in this case, and cryogenic freonll-11 flows to cooling coil 31, and cold is passed to CO ₂CO in the receiver ₂Gas makes CO ₂Gas cooling becomes liquid, reduces pressure, CO ₂The receiver pressure-stabilisation is in allowed band.On the contrary, CO sometimes ₂Receiver 16 internal pressures can very low (as northern winter) in severe cold this be unallowable because this moment CO ₂The receiver temperature is very low, can produce brittle rupture.The utility model is provided with pressure compensator 15 for this reason, and it is actually an electric heater, is inserted in the U type pipe 33 the liquid CO in the annular crack that forms between U type inside pipe wall and electrical heating element by electrical heating element 34 ₂, at electrical heating element energising post-heating, temperature rises, and becomes gas and turns back to CO again ₂In the receiver 16, temperature rises, and pressure improves, and reaches pressure compensated purpose.

As shown in Figure 4, the vapourizing unit in the utility model is made up of vaporizer 18, in-line pump 17 and pipeline 38, and wherein vaporizer 18 adopts the water-bath cell structure; Be provided with dividing plate 39 in the cylindrical shell 35 of vaporizer 18 and fill water, two

portions

37,40 before and after with dividing plate 39 cylindrical shell 35 being divided into are provided with steam heating tube 41 and CO in rear portion 40 ₂ U type pipe 36 and all be immersed in the water; With in-line pump 17 with in anterior 37 and water 38 circulations by the road in the rear portion 40; During vaporization, steam feeds in the steam heating tube 41, the water in the heating rear portion 40, and hot water is transported in anterior 37 by in-line pump 17, CO ₂Liquid CO in the U type pipe 36 ₂Absorb the heat in the water, temperature raises and becomes gas output use.Sent back to rear portion 40 heating, so circulation by in-line pump 17 again after the water cooling.Water was xeothermic body during this vaporization was put, and its thermal capacity is big, and temperature variation is steady, guarantees CO ₂Supply gas pressure and feed air temperature are steady, make device safe and reliable to operation.

As shown in Figure 5, the carbon dioxide condensing device 13 in the utility model is a cylindrical shell 44, and its top is provided with collection chamber 42, and the inwall of collection chamber 42 forms air collecting chamber 43, CO ₂Some incoagulability gas such as N in the gas ₂, O ₂Little Deng proportion, to rising, converge in the air collecting chamber 42 CO ₂Because of sinking than great; Therefore, the non-condensable gases concentration in the air collecting chamber 43 progressively improves, and regularly discharges the non-condensable gases in the air collecting chamber 43, CO ₂Further purify.At CO ₂The below of condenser 13 cylindrical shells 44 is provided with liquid collecting room 46, and the inwall of liquid collecting room 46 forms liquid collecting cavity 45, condensed liquid CO ₂Accumulate in the liquid collecting cavity 45 and guarantee CO ₂Liquid flows into CO smoothly ₂In the receiver 16.

As shown in Figure 6, the utility model washing tower 3 tops are provided with mist eliminator 47, are used for removing CO ₂Vaporific drop in the gas makes the CO that enters compressor unit 6 ₂Gas is the CO under the state of saturation ₂Gas does not contain liquid moisture, avoids compressor generation liquid hammer accident, and assurance compressor unit safety is normally moved.

As shown in Figure 7, technical process of the present utility model, also promptly use state to be summarized as follows:

CO 2 raw material gas at first enters scum dredger 1 and removes mechanical impurity, foam etc. and enter washing tower 3 washing and (make water wash Ji Dita 3 internal recycle by water circulating pump 4, washing water need regularly replace) washing after carbon dioxide divide two-way, one the tunnel enters compressor unit 6 pressurize reaches about 2.0MPa, another road enters reservoir 5, reservoir plays shock absorption, the pressure of constant compression unit 6, the CO after boosting ₂Enter the refining plant of forming by 7,8 and two drying towers 9,10 of two adsorption towers, carry out purifying treatment such as taste removal, drying.Sorbent material in the adsorption tower 7,8 is regenerated with steam, and the siccative in the drying tower 9,10 is regenerated with internal heating.CO after the purification ₂Gas enters CO after water cooler 11 coolings ₂Condenser 13, CO ₂The eighteenth of the twenty 22 refrigeration agents carry out heat exchange cooling liquefaction in the fluorine that this and unit cooler 12 provide.Liquid CO ₂From CO ₂Condenser 13 flows into CO ₂Receiver 16 is stored.During use, liquid CO ₂Can be by CO ₂Transferpump 19 pours into tank car, or by CO ₂Filling pump 21 is through CO ₂Pack into steel and 24 of Filling Unit 23, export trade is used.Also can enter vaporizer 18 heating, become gas, each uses with gas point to be piped to the user.

General effect of the present utility model is summarized as follows:

1. improved CO ₂Quality

Adsorption tower 7,8 adopts steam regeneration, and drying tower 9,10 adopts internal heating regeneration, and the air admission device of stopping in service adds CO ₂The improvement of condenser structure (collection chamber and liquid collecting room are set) helps removing the non-condensable gases of sneaking in the unstripped gas, makes CO ₂Quality obviously improve.

2. because CO ₂Sump assemblies (comprises CO ₂Receiver 16, little unit cooler 14 pressure compensators 15), guarantee CO ₂The pressure of receiver 16, temperature-stable have avoided answering CO ₂Liquid CO in the receiver mouth 16 ₂Because of over-pressure over-temperature emptying, improved CO ₂Recovery rate, also improved the device reliability of operation.

3. simplified system, minimizing equipment is convenient to operating maintenance

Because refining plant (comprises adsorption tower 7,8, the improvement of regeneration drying tower 9,10), reduced equipment, from Fig. 1,2 as can be seen, equipment reduces to 4 from 7, and floor space also reduces to 3.2 meters * 1 meter from 3.2 meters * 3 meters, from figure also as can be seen, accessibility to individual device is good, is convenient to operation and ordinary maintenance like this.

4. the utility model entity purified liquid CO ₂Pressure is 1.6-2.0MPa, and this is to realize tank car transportation prerequisite.Realize that the tank car transportation can reduce transportation cost greatly, expedite product is promoted the use of.

5. vaporizer 18 has adopted the water-bath type structure, and the gasification of carbonic acid gas is more steady, makes supply gas pressure and feed air temperature stable.

Claims

1, the vapourizing unit in the purifying carbon dioxide retrieving arrangement, it is made up of vaporizer, in-line pump and pipeline, it is characterized in that: vaporizer adopts the water-bath cell structure: be provided with dividing plate in the cylindrical shell of vaporizer and fill water, with dividing plate cylindrical shell is divided into front and back two portions, be provided with steam heating tube in the rear portion, another part is provided with CO ₂U type pipe, and all be immersed in the water.

2, the vapourizing unit in the purifying carbon dioxide retrieving arrangement as claimed in claim 1 is characterized in that: the water in the front and rear is constituted circulation and establish by pipeline connection with in-line pump.