CN204656043U - The condensing benzene recovery system of coke-oven plant - Google Patents
The condensing benzene recovery system of coke-oven plant Download PDFInfo
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- CN204656043U CN204656043U CN201520325757.8U CN201520325757U CN204656043U CN 204656043 U CN204656043 U CN 204656043U CN 201520325757 U CN201520325757 U CN 201520325757U CN 204656043 U CN204656043 U CN 204656043U
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Abstract
The utility model discloses a kind of condensing benzene recovery system of coke-oven plant, comprise benzene gas compression set, refrigerating plant and benzene fluid reservoir; Described benzene gas compression set comprises centrifugal compressor, switch board and air accumulator, and described refrigerating plant comprises screw type refrigerating compressor, oil eliminator, water-cooled condenser, electric expansion valve and shell and tube evaporator; The inlet valve of centrifugal compressor is connected with benzene gas gas outlet to be recycled, and the air bleeding valve of centrifugal compressor is connected with the air inlet of air accumulator, and the gas outlet of air accumulator is connected with the air inlet of shell and tube evaporator, and the liquid outlet of shell and tube evaporator is connected with benzene fluid reservoir.Compared with prior art, the utility model, by by condensation again after benzene gas pressure-raising to 0.4MPa, makes condensation temperature bring up to-25 DEG C by-60 DEG C, simplifies the structure of refrigerating plant, reduce initial cost and the operating cost of recovery system.
Description
Technical field
The utility model relates to a kind of condensing benzene recovery system of coke-oven plant, belongs to benzene gas liquefaction technology field.
Background technology
There is recovery workshop coke-oven plant, and main regenerant is benzene, and early stage employing is washed benzene tower and reclaimed, and the later stage adopts condensation alternated blasting to reclaim.Basic employing normal pressure condensation at present, because in gas recovery, benzene concentration is lower, needs in the refrigeration machine of recovery system to provide the low temperature of-60 DEG C to realize the liquefaction of benzene in gas recovery, there is Energy Efficiency Ratio lower, the problem that system cloud gray model expense is high.Application number be 201410499320.6 Chinese patent application " a kind of benzene class organic vapor recovery device and recovery method thereof " provide a kind of at-30 DEG C of cryogenic condensations, again by Temp .-changing adsorption and pressure-variable adsorption mode to improve the rate of recovery of benzene, but it is higher also to there is equipment cost, the problems such as organic efficiency is not high.
Utility model content
Goal of the invention: for the deficiencies in the prior art, the utility model provides a kind of condensing benzene recovery system of novel coke-oven plant, to improve systematic energy efficiency ratio, reduces refrigeration requirement, reduces system cloud gray model expense.
Technical scheme: for achieving the above object, the utility model adopts following technical scheme:
A condensing benzene recovery system for coke-oven plant, comprises benzene gas compression set, refrigerating plant and benzene fluid reservoir; Described benzene gas compression set comprises centrifugal compressor, switch board and air accumulator, and described refrigerating plant comprises screw type refrigerating compressor, oil eliminator, water-cooled condenser, electric expansion valve and shell and tube evaporator; The inlet valve of centrifugal compressor is connected with benzene gas gas outlet to be recycled, and the air bleeding valve of centrifugal compressor is connected with the air inlet of air accumulator, and the gas outlet of air accumulator is connected with the air inlet of shell and tube evaporator, and the liquid outlet of shell and tube evaporator is connected with benzene fluid reservoir.
Further, described centrifugal compressor is provided with the temperature sensor detecting delivery temperature, described air accumulator is provided with the pressure sensor detecting gas pressure in tank, described switch board is electrically connected with described temperature sensor and pressure sensor respectively, and described switch board is also electrically connected with the inlet valve of described centrifugal compressor, air bleeding valve and by-passing valve respectively.
Further, described centrifugal compressor is explosion-proof centrifugal compressor.
Further, described centrifugal compressor is the centrifugal compressor adopting oil-free lubrication mode.
Further, described centrifugal compressor outside is provided with cooling device.Preferably, described cooling device is the cooling water cover being wrapped in described centrifugal compressor outer wall.
Beneficial effect: condensing benzene recovery system of the present utility model, existing benzene recovery system has carried out upgrading, has added benzene gas compression set before refrigerating plant, carried out cooling liquid again by after gas boosting to be recycled.Compared with prior art, tool has the following advantages: the evaporimeter entering refrigerating plant after 1, being compressed by centrifugal compressor by benzene gas is again liquefied, final condensing temperature significantly improves, reduce the requirement to refrigerating plant, greatly simplify the structure of refrigerating plant, significantly can reduce initial cost and the operating cost of recovery system.2, gather real time temperature and pressure data by set temperature sensor and pressure sensor in benzene gas compression set, can monitor in real time and regulate pressure at expulsion and the delivery temperature of benzene gas compression set; And adopt explosion-proof centrifugal compressor, and at compressor outer setting cooling device, ensure that high security and the high reliability of system cloud gray model.
Accompanying drawing explanation
Fig. 1 is the system architecture schematic diagram of the utility model embodiment.
In figure, 1: centrifugal compressor, 2: switch board, 3: air accumulator, 4: shell and tube evaporator, 5: screw type refrigerating compressor, 6: oil eliminator, 7: water-cooled condenser, 8: electric expansion valve, 9: benzene fluid reservoir, 10: pressure sensor, 11: temperature sensor.
Detailed description of the invention
Below in conjunction with specific embodiment, illustrate the utility model further, these embodiments should be understood and be only not used in restriction scope of the present utility model for illustration of the utility model, after having read the utility model, the amendment of those skilled in the art to the various equivalent form of value of the present utility model has all fallen within the application's claims limited range.
As shown in Figure 1, the disclosed condensing benzene recovery system for coke-oven plant of the utility model embodiment, comprises benzene gas compression set, refrigerating plant and benzene fluid reservoir 9; Wherein, benzene gas compression set comprises centrifugal compressor 1, switch board 2 and air accumulator 3.The inlet valve of centrifugal compressor 1 is connected with benzene gas gas outlet to be recycled by the pipeline of DN500 bore, and air bleeding valve is connected with the air inlet of air accumulator 3 by the pipeline of DN300 bore.Refrigerating plant by the screw type refrigerating compressor 5 of-25 DEG C of low-temperature receivers can be provided, cold-producing medium is taken out of the refrigeration oil of compressor carry out being separated and send back to compressor oil pocket with adapt to the oil eliminator 6 of worst cold case, the water-cooled condenser 7 that high-temperature high-pressure refrigerant is cooled, to the electric expansion valve 8 of cold-producing medium throttling with guarantee that cold-producing medium to cool benzene gas and the shell and tube evaporator 4 of benzene gas efficient liquefaction is connected successively, form an airtight system, cold-producing medium constantly circulates in systems in which, generation state changes, and carries out exchange heat with the external world.The gas outlet of air accumulator 3 is connected with the air inlet of shell and tube evaporator 4 by the pipeline of DN300 bore, and the liquid outlet of shell and tube evaporator 4 is connected with the inlet of benzene fluid reservoir 9 by the pipeline of D100 bore.Pipeline bore herein can adjust according to actual treatment tolerance, and set for the feature that coke-oven plant's recovery benzene tolerance is larger, pipeline bore is more than DN300, and the bore of air inlet pipe is greater than the bore of escape pipe.
Centrifugal compressor 1 is the explosion-proof centrifugal compressor that can adapt to benzene gas, and in order to adapt to the explosive properties of benzene gas, centrifugal compressor 1 adopts fire-proof motor, explosion-proof solenoid valve and anti-explosion terminal box; In order to prevent lubricating oil atomization after stain benzene gas, centrifugal compressor 1 adopts oil-free lubrication mode; Can not cause in order to ensure compression process and fire, centrifugal compressor 1 outside is provided with cooling device, and this cooling device can be the cooling water cover being wrapped in centrifugal compressor 1 outer wall, also can adopt other common air cooling, water cooling or oil coolers.In addition, in order to monitor the compression of benzene gas better, centrifugal compressor 1 is established temperature sensor 11 (as being located at air bleeding valve place), be used for detecting the delivery temperature in compressor, air accumulator 3 is established pressure sensor 10(as being located at air inlet place), be used for detecting the gas pressure in air accumulator 3, switch board 2 respectively with temperature sensor 11, the inlet valve of pressure sensor 10 and centrifugal compressor 1, air bleeding valve is connected with by-passing valve, collecting temperature and pressure data, control signal is exported after calculating, as by with preset temperature and pressure compare after, the open degree controlling the by-passing valve of centrifugal compressor 1 regulates pressure at expulsion and delivery temperature.Other safety precautions such as also can take warning, valve-off when switch board 2 judges abnormal according to the data gathered, cut off the electricity supply.
Use the condensing benzene recovery method of the coke-oven plant of above-mentioned condensing benzene recovery system, detailed process is as follows:
(1) benzene gas compression: benzene gas gathering-device in coke-oven plant is collected the benzene gas come and pass into centrifugal compressor through the pipeline of DN500 bore and inlet valve, pass into air accumulator through the air bleeding valve of DN300 bore and pipeline after centrifugal compressor pressure-raising to 0.4MPa pressure; When carrying out gas compression, gas pressure data in switch board Real-time Collection exhaust temperature data and air accumulator, the data feedback collected is to the PLC processor in switch board, instruction is assigned by control loop to centrifugal compressor after PLC computing, control the open degree of compressor bypass valve to regulate pressure at expulsion and delivery temperature, with control temperature and pressure within the scope of setting, if temperature is between 80-90 DEG C, pressure is between 0.4 ~ 0.5MPa.
(2) cryogenic condensation: the benzene gas after compression in air accumulator is passed into shell and tube evaporator through the pipeline of DN300 bore, and condense into liquid phenenyl after being cooled to-25 DEG C by low-temperature refrigerant, liquid phenenyl concentrates on bottom shell and tube evaporator;
(3) liquid benzene is collected: by the pipeline input benzene fluid reservoir of the liquid benzene in shell and tube evaporator through DN100, realize benzene and reclaim.
Benzene recovery system disclosed in the utility model embodiment, consider that coke-oven plant's usual benzene tolerance is larger, and benzene atmospheric boiling point be 80 DEG C without the need to improve too large pressure, select to adopt centrifugal compressor to pass through benzene gas pressure-raising, and through the system of careful refinement, make the ultimate evaporating temperature of refrigerating plant bring up to-25 DEG C by-60 DEG C, the effect of benzene liquefaction can be reached equally, thus simplify refrigerating plant, improve the Energy Efficiency Ratio of refrigerating plant and whole recovery system.And by safety precautions such as explosion-proof, real time temperature and Stress control, make whole system run safer stable, high efficient and reliable.
Claims (6)
1. a condensing benzene recovery system for coke-oven plant, is characterized in that, comprises benzene gas compression set, refrigerating plant and benzene fluid reservoir; Described benzene gas compression set comprises centrifugal compressor, switch board and air accumulator, and described refrigerating plant comprises screw type refrigerating compressor, oil eliminator, water-cooled condenser, electric expansion valve and shell and tube evaporator; The inlet valve of centrifugal compressor is connected with benzene gas gas outlet to be recycled, and the air bleeding valve of centrifugal compressor is connected with the air inlet of air accumulator, and the gas outlet of air accumulator is connected with the air inlet of shell and tube evaporator, and the liquid outlet of shell and tube evaporator is connected with benzene fluid reservoir.
2. condensing benzene recovery system according to claim 1, it is characterized in that, described centrifugal compressor is provided with the temperature sensor detecting delivery temperature, described air accumulator is provided with the pressure sensor detecting gas pressure in tank, described switch board is electrically connected with described temperature sensor and pressure sensor respectively, and described switch board is also electrically connected with the inlet valve of described centrifugal compressor, air bleeding valve and by-passing valve respectively.
3. condensing benzene recovery system according to claim 1, is characterized in that, described centrifugal compressor is explosion-proof centrifugal compressor.
4. condensing benzene recovery system according to claim 1, is characterized in that, described centrifugal compressor is the centrifugal compressor adopting oil-free lubrication mode.
5. condensing benzene recovery system according to claim 1, is characterized in that, described centrifugal compressor outside is provided with cooling device.
6. condensing benzene recovery system according to claim 5, is characterized in that, described cooling device is the cooling water cover being wrapped in described centrifugal compressor outer wall.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520325757.8U CN204656043U (en) | 2015-05-19 | 2015-05-19 | The condensing benzene recovery system of coke-oven plant |
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| CN201520325757.8U CN204656043U (en) | 2015-05-19 | 2015-05-19 | The condensing benzene recovery system of coke-oven plant |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104826354A (en) * | 2015-05-19 | 2015-08-12 | 南京都乐制冷设备有限公司 | Condensed type benzene recycling system of coking plant and condensed type benzene recycling method |
| CN110375518A (en) * | 2019-05-16 | 2019-10-25 | 南通亚泰工程技术有限公司 | VOC gas processing unit |
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2015
- 2015-05-19 CN CN201520325757.8U patent/CN204656043U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104826354A (en) * | 2015-05-19 | 2015-08-12 | 南京都乐制冷设备有限公司 | Condensed type benzene recycling system of coking plant and condensed type benzene recycling method |
| CN110375518A (en) * | 2019-05-16 | 2019-10-25 | 南通亚泰工程技术有限公司 | VOC gas processing unit |
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