CN104826354A - Condensed type benzene recycling system of coking plant and condensed type benzene recycling method - Google Patents
Condensed type benzene recycling system of coking plant and condensed type benzene recycling method Download PDFInfo
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- CN104826354A CN104826354A CN201510257552.5A CN201510257552A CN104826354A CN 104826354 A CN104826354 A CN 104826354A CN 201510257552 A CN201510257552 A CN 201510257552A CN 104826354 A CN104826354 A CN 104826354A
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Abstract
The invention discloses a condensed type benzene recycling system of a coking plant and a condensed type benzene recycling method. The recycling system comprises a benzene gas compression device, a refrigeration device and a benzene liquid storage tank, wherein the benzene gas compression device comprises a centrifugal compressor, a control cabinet and a gas storage tank; the refrigeration device comprises a screw rod type refrigeration compressor, an oil separator, a water cooling condenser, an electronic expansion valve and a shell-pipe type evaporator; a gas suction valve of the centrifugal compressor is connected with a gas outlet of benzene gas to be recycled; a gas exhausting valve of the centrifugal compressor is connected with a gas inlet of the gas storage tank; a gas outlet of the gas storage tank is connected with the gas inlet of the shell-pipe type evaporator; and a liquid outlet of the shell-pipe type evaporator is connected with the benzene liquid storage tank. Compared with the prior art, the condensed type benzene recycling system has the advantages that the benzene gas pressure is improved to 0.4MPa and then the benzene gas is condensed so that the condensation temperature is improved to -25 DEG C from -60 DEG C; and the structure of the refrigeration device is simplified, the initial cost and the operation cost of a recycling system are reduced, and the recycling rate of the benzene gas is increased.
Description
Technical field
The present invention relates to a kind of condensing benzene recovery system and recovery method thereof of coke-oven plant, belong 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.
Summary of the invention
Goal of the invention: for the deficiencies in the prior art, the invention provides a kind of condensing benzene recovery system and recovery method thereof 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 present invention 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.
Use the condensing benzene recovery method of the coke-oven plant of above-mentioned condensing benzene recovery system, comprise the steps:
(1) benzene gas compression: the centrifugal compressor benzene gas that coke-oven plant collects being passed into benzene gas compression set, in centrifugal compressor, pressure-raising passes into air accumulator after 0.4 ~ 0.5MPa pressure;
(2) cryogenic condensation: the shell and tube evaporator benzene gas after compression in air accumulator being passed into refrigerating plant, cooling liquid under-25 DEG C of low temperature;
(3) liquid benzene is collected: by the liquid benzene input benzene fluid reservoir in shell and tube evaporator.
Beneficial effect: condensing benzene recovery system of the present invention, 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.3, by by condensation again after benzene gas compression, not only increase the ultimate evaporating temperature of refrigerating plant, also significantly improve the rate of recovery of benzene gas.
Accompanying drawing explanation
Fig. 1 is the system architecture schematic diagram of the embodiment of the present invention.
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 present invention further, these embodiments should be understood only be not used in for illustration of the present invention and limit the scope of the invention, after having read the present invention, the amendment of those skilled in the art to the various equivalent form of value of the present invention 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 embodiment of the present invention, 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.
Table 1 is the correction data of the recovery system of inventive embodiments and existing normal pressure condensation being carried out benzene recovery.It can thus be appreciated that the embodiment of the present invention is while simplifying recovery system, also improves the benzene rate of recovery of system, reach the discharge standard of gas recovery.
Benzene recovery system disclosed in the embodiment of the present invention, 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 by 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 same effect that can reach benzene liquefaction, thus simplify refrigerating plant, improve the Energy Efficiency Ratio of refrigerating plant and whole recovery system, and the rate of recovery of benzene.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 (7)
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.
7. use a condensing benzene recovery method for the coke-oven plant of condensing benzene recovery system as claimed in claim 1, it is characterized in that, comprise the steps:
(1) benzene gas compression: the centrifugal compressor benzene gas that coke-oven plant collects being passed into benzene gas compression set, in centrifugal compressor, pressure-raising passes into air accumulator after 0.4 ~ 0.5MPa pressure;
(2) cryogenic condensation: the shell and tube evaporator benzene gas after compression in air accumulator being passed into refrigerating plant, cooling liquid under-25 DEG C of low temperature;
(3) liquid benzene is collected: by the liquid benzene input benzene fluid reservoir in shell and tube evaporator.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111548244A (en) * | 2020-05-11 | 2020-08-18 | 江苏中能化学科技股份有限公司 | Method for recovering benzene and high-purity hydrogen in high yield from tail gas of biphenyl preparation process |
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| US5294246A (en) * | 1992-12-21 | 1994-03-15 | The Dow Chemical Company | Emission suppression system for stored volatile organic compounds |
| CN202010505U (en) * | 2011-03-15 | 2011-10-19 | 黄道军 | Energy-saving organic gas recovery device based on isothermal compression |
| CN102407026A (en) * | 2011-10-27 | 2012-04-11 | 南京都乐制冷设备有限公司 | Two-stage benzene organic vapor recovery device and its recovery method |
| CN202860371U (en) * | 2012-10-24 | 2013-04-10 | 中国石油化工股份有限公司 | Combined-type benzene series recycling system |
| CN104225951A (en) * | 2014-09-25 | 2014-12-24 | 南京都乐制冷设备有限公司 | Benzene organic vapor recycling device and benzene organic vapor recycling method |
| CN204656043U (en) * | 2015-05-19 | 2015-09-23 | 南京都乐制冷设备有限公司 | The condensing benzene recovery system of coke-oven plant |
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2015
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5294246A (en) * | 1992-12-21 | 1994-03-15 | The Dow Chemical Company | Emission suppression system for stored volatile organic compounds |
| CN202010505U (en) * | 2011-03-15 | 2011-10-19 | 黄道军 | Energy-saving organic gas recovery device based on isothermal compression |
| CN102407026A (en) * | 2011-10-27 | 2012-04-11 | 南京都乐制冷设备有限公司 | Two-stage benzene organic vapor recovery device and its recovery method |
| CN202860371U (en) * | 2012-10-24 | 2013-04-10 | 中国石油化工股份有限公司 | Combined-type benzene series recycling system |
| CN104225951A (en) * | 2014-09-25 | 2014-12-24 | 南京都乐制冷设备有限公司 | Benzene organic vapor recycling device and benzene organic vapor recycling method |
| CN204656043U (en) * | 2015-05-19 | 2015-09-23 | 南京都乐制冷设备有限公司 | The condensing benzene recovery system of coke-oven plant |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111548244A (en) * | 2020-05-11 | 2020-08-18 | 江苏中能化学科技股份有限公司 | Method for recovering benzene and high-purity hydrogen in high yield from tail gas of biphenyl preparation process |
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Application publication date: 20150812 |