CN104031690A - Screw and multistage centrifugal unit compression gas delivery system - Google Patents
Screw and multistage centrifugal unit compression gas delivery system Download PDFInfo
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- CN104031690A CN104031690A CN201410234249.9A CN201410234249A CN104031690A CN 104031690 A CN104031690 A CN 104031690A CN 201410234249 A CN201410234249 A CN 201410234249A CN 104031690 A CN104031690 A CN 104031690A
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Abstract
The invention discloses a screw and multistage centrifugal unit compression coke oven gas delivery system comprising a coke oven gas compression and delivery subsystem, a cooling water subsystem and a washing subsystem arranged in parallel, wherein the coke oven gas compression subsystem comprises a screw compressor, a direct cooling tower and multistage centrifugal compression units arranged at the outlet of a coke oven gas cabinet and sequentially communicated with each other through gas pipelines, and a vertical shell-and-tube centrifugal compressor cooler is arranged at the rear end of each stage of centrifugal compression unit; the cooling water subsystem comprises a mother pipe and branch pipes which are communicated with the mother pipe and arranged in parallel, have the same number as the centrifugal compressor coolers and are used for cooling coke oven gas in the centrifugal compressor coolers. The system disclosed by the invention has the advantages that the phenomena of leakage of compression cylinder valves and blockage of inter-coolers are effectively reduced in the compression and delivery process of the coke oven gas, the overhauling frequency is greatly reduced, the operation rate and the operating efficiency are improved, and the consumption of electrical energy is reduced.
Description
Technical field
The present invention relates to the delivery system of coke-oven gas applied technical field, particularly a kind of coke-oven gas.
Background technology
In modernization Chemical Manufacture, taking coke-oven gas as raw material synthetic ammonia, methanol, hydrogen making or adopt the process for processing such as gas turbine power generation all will first carry this important link through coke-oven gas supercharging.Can say, it is the heart of coke-oven gas processing and utilization system that operation is carried in supercharging, and its continuous and steady operation is to guarantee the normal basis producing of coke-oven gas deep-processing system, is also to guarantee coal chemical enterprise coal gas sales volume, increases the key of economic benefit.
China utilizes the coal chemical enterprise of coke-oven gas synthetic ammonia and methanol, generally adopts four section of eight cylinder reciprocating compressor unit to carry coke-oven gas supercharging, still, uses this technology can have comparatively distinct issues at the compression course of conveying of coke-oven gas.First, in purified gas after normal pressure purifies, still contain the larger molecular organicses such as micro-coal dust, anthracene, acenaphthene, fluorenes, dibenzofuran, methylnaphthalene, naphthalene, indenes, coumarone and vinylbenzene, wherein multiple unsaturated compounds has thermo-sensitivity, thermopolymerization easily occurs and generate macromolecular resin.In compression process at coke-oven gas by reciprocation compressor group, because the compression ratio of each section of unit is large, coke-oven gas temperature is high, the factors such as coke-oven gas residence time in cylinder is long, can generate organic polymer, accumulate a large amount of pitch shape organism at compressor cylinder and valve place thereof, thereby cause compressor cylinder valve to be revealed.Secondly, in coke-oven gas, except containing the larger molecular organicses such as fine breeze, tar, naphthalene and temperature-sensitive organism, also contain CO simultaneously
2, H
2s, NH
3and O
2, under high-temperature pressurizing condition, H
2s and O
2claus reaction can occur and generate elemental sulfur, heat-sensitive substance can generate dope by polymerization reaction take place; And under low temperature pressurized conditions, the naphthalene of trace meeting crystallization in coal gas, CO
2and H
2s and NH
3effect also can generate solid ammonium salt.Therefore,, when compressed coke oven gas is by between horizontally-arranged shell and tube machine when water cooler, fine breeze, naphthalene, hot polymerization dope, elemental sulfur and solid ammonium salt will cause water cooler between machine to block.
In sum, because water cooler between the leakage of compressor cylinder valve and machine blocks, in carrying, coke-oven gas compression there will be following problem: 1) frequently, working rate is low in maintenance.According to relevant manufacturing enterprise statistics, coal gas utilizes the normal working rate less than 85% of reciprocating supercharging unit.Thereby due in compressor cylinder and valve blow-by and compressor chamber water cooler stop up and cause unit maintenance cleaning frequent, working rate reduces.2) operational efficiency is low, and power consumption is large.The reciprocating sliding friction power of cylinder and gas compression piston is larger, causes active power to reduce; Because of larger molecular organics coking deposition, cause compressor cylinder turnover valve blow-by, cause pressurized gas to reflux, and flog a dead horse; Gas temperature is high, volume is large, makes to compress conveying energy consumption higher.
In addition, due to the limitation of four section of eight cylinder reciprocating compressor unit cooling itself mode and compression method, in carrying, actual coke-oven gas compression also there will be compared with distinct issues with not enough.First, coke-oven gas by every grade of compression after, gas temperature all can rise to more than 150 DEG C, relies on recirculated water to be cooled to 45 DEG C just can enter below next stage compression, therefore can cause coal gas compression to carry cooling-water consumption more.Secondly, for normal pressure coke-oven gas, by the highest 2.3MPa that only can arrive of gas pressure after level Four reciprocation compressor group, after methane conversion, volume increases nearly 1.5 times, and for the synthesis of the about 15MPa of pressure of ammonia, for the production of the about 6MPa of pressure of methyl alcohol, therefore, follow-up synthetic ammonia or synthesizing methanol all need repressurize, and follow-up energy consumption improves.Moreover, four sections of reciprocation compressor groups of domestic production at present, separate unit compression transport capacity maximum is only 22000Nm
3/ h.For larger coal chemical enterprise, coke-oven gas deep processing needs many units, and floor space is large, maintenance cost is high, and particularly reciprocation compressor group, can only adopt electric drive, steam driven be can not adopt, the reasonable classification use of power steam and the raising of hot working efficiency are unfavorable for.
Summary of the invention
In view of the problem of above-mentioned prior art existence, the invention provides a kind of screw rod and multistage centrifugal chiller compression conveying coal gas system, for solve coke-oven gas compression course of conveying due in compressor cylinder and valve blow-by and compressor chamber water cooler stops up the unit maintenance cleaning that causes frequently, working rate is low, operational efficiency is low, the problem that power consumption is large.
For solving the problems of the technologies described above, the technical solution adopted in the present invention is as follows:
Coke oven gas system is carried in screw rod and the compression of multistage centrifugal chiller, comprises parallel coke-oven gas compression transport subsystem and the water coolant subsystem arranging; Described coke-oven gas compression subsystem comprises the spiral-lobe compressor that is arranged on coke-oven coal gas holder exit and is communicated with successively by gas line, direct-cooled tower and multistage centrifugal compressor group, and wherein the rear end of every grade of Systems of Centrifugal Compressor Unit all arranges a vertical row tubular type centrifugal compressor water cooler; Described water coolant subsystem comprise female pipe with mother manage be communicated be set up in parallel be applied to mutually the arm of coke-oven gas in cooling centrifugal compressor water cooler with centrifugal compressor water cooler quantity.
Improvement of the present invention is: described direct-cooled tower comprises the direct-cooled tower of the epimere being connected and the direct-cooled tower of hypomere, after the coke-oven gas of drawing from spiral-lobe compressor is sent in the direct-cooled tower of hypomere, discharges through the direct-cooled top of tower of epimere.
Improvement of the present invention is: also comprise and the parallel washing subsystem arranging of coke-oven gas compression transport subsystem, washing composition in described washing subsystem is sent into direct-cooled tower middle part through final stage centrifugal compressor water cooler successively against coke-oven gas traffic direction to first step centrifugal compressor water cooler, the washing composition entering in direct-cooled tower divides two branch roads to wash the coke-oven gas in direct-cooled tower, wherein branch road is delivered to the direct-cooled top of tower of epimere from direct-cooled tower middle part through the direct-cooled tower recycle pump of epimere and is sprayed downwards, another branch road is directly from the direct-cooled tower spray of direct-cooled tower middle part hypomere downwards, last washing composition is discharged through direct-cooled tower bottom.
Improvement of the present invention is: the washing composition Fen San road output of discharging from direct-cooled tower bottom, first is returned to the direct-cooled tower of hypomere top through the direct-cooled tower recycle pump of hypomere along separate routes, after the second shunt is filtered, sends in the gas line before spiral-lobe compressor coke-oven gas is washed, the 3rd is back to washing subsystem entrance end along separate routes.
Improvement of the present invention is: on the branch road at the direct-cooled tower recycle pump of described epimere place, be provided with the direct-cooled tower deep cooling of epimere watercooler, in first shunt at the direct-cooled tower recycle pump of hypomere place, be provided with the direct-cooled tower water recirculator of hypomere, in second shunt at strainer place, be provided with spiral-lobe compressor washing composition water cooler.
Improvement of the present invention is: described water coolant subsystem also comprises with mother manages the branch road for the direct-cooled tower water recirculator of cooling hypomere and spiral-lobe compressor washing composition water cooler being communicated with.
Improvement of the present invention is: the direct-cooled tower deep cooling of described epimere watercooler is through 16 DEG C of lithium bromide refrigerating water coolings.
Improvement of the present invention is also: described washing composition is less salt ammonia still process dephenolize waste water.
Owing to having adopted above technical scheme, the invention technological progress is as follows:
The present invention has effectively reduced the phenomenon that between the leakage of compressor cylinder valve and machine, water cooler blocks in the compression course of conveying of coke-oven gas, greatly reduces repair rate, has improved working rate and operational efficiency, has reduced power consumption.In addition, the present invention makes the gas temperature of screw compressor exit and each section of outlet of centrifugal chiller lower than 85 DEG C, has reduced the consumption of gas temperature and water coolant; The present invention can be compressed to 1.6～3.5MPa by coke-oven gas, has reduced the energy consumption that follow-up supercharging brings; Compressor unit list cover power is large, can guarantee annual continuous and steady operation 8000 hours, and can adopt steam driven, is conducive to the reasonable classification of power steam and the raising of hot working efficiency.
Brief description of the drawings
Fig. 1 is process flow sheet of the present invention.
Wherein: 1. spiral-lobe compressor, 2. direct-cooled tower, the direct-cooled tower recycle pump of 21. epimere, the direct-cooled tower recycle pump of 22. hypomere, 31 ~ 35. Systems of Centrifugal Compressor Unit, 41 ~ 45. centrifugal compressor water coolers, 5. washing composition force (forcing) pump, the direct-cooled tower deep cooling of 61. epimere watercooler, the direct-cooled tower water recirculator of 62. hypomere, 63. spiral-lobe compressor washing composition water coolers, 7. strainer.
Heavy line with arrow in figure is coke-oven gas trend, and the fine line with arrow is washing composition trend, and the dotted line with arrow is water coolant trend.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is further elaborated.
Coke oven gas system is carried in a kind of screw rod and the compression of multistage centrifugal chiller, and its technical process as shown in Figure 1.Comprise parallel coke-oven gas compression transport subsystem, water coolant subsystem and the washing subsystem arranging.
Coke-oven gas compression subsystem comprises the spiral-lobe compressor 1, direct-cooled tower 2 and the multistage centrifugal compressor group that are arranged on coke-oven coal gas holder exit and are communicated with successively by gas line, and wherein the rear end of every grade of Systems of Centrifugal Compressor Unit all arranges a vertical row tubular type centrifugal compressor water cooler; In the present embodiment, design altogether Pyatyi Systems of Centrifugal Compressor Unit 31 ~ 35 and five centrifugal compressor water coolers 41 ~ 45.In the present invention, the trend of coke-oven gas is as shown in the heavy line with arrow in Fig. 1.
Direct-cooled tower in the present invention comprises the direct-cooled tower of the epimere being connected and the direct-cooled tower of hypomere, after the coke-oven gas of drawing from spiral-lobe compressor is sent in the direct-cooled tower of hypomere, discharges through the direct-cooled top of tower of epimere.
Washing composition in washing subsystem is sent into direct-cooled tower middle part through final stage centrifugal compressor water cooler successively against coke-oven gas traffic direction to first step centrifugal compressor water cooler, the washing composition entering in direct-cooled tower divides two branch roads to wash the coke-oven gas in direct-cooled tower, wherein branch road is delivered to the direct-cooled top of tower of epimere from direct-cooled tower middle part through the direct-cooled tower recycle pump 21 of epimere and is sprayed downwards, and another branch road is directly from the direct-cooled tower spray of direct-cooled tower middle part hypomere downwards; Last washing composition is discharged through direct-cooled tower bottom.The washing composition Fen San road output of discharging from direct-cooled tower bottom, first is returned to the direct-cooled tower of hypomere top through the direct-cooled tower recycle pump 22 of hypomere along separate routes, second sends in the gas line before spiral-lobe compressor coke-oven gas is washed along separate routes after filter 7 filters, and the 3rd is back to washing subsystem entrance end along separate routes.Washing composition in the present invention adopts less salt ammonia still process dephenolize waste water.The present invention washs the trend of washing composition in subsystem as shown in the fine line with arrow in Fig. 1.
On the branch road at the direct-cooled tower recycle pump of epimere 21 places, be provided with the direct-cooled tower deep cooling of epimere watercooler 61, in first shunt at the direct-cooled tower recycle pump of hypomere 22 places, be provided with the direct-cooled tower water recirculator 62 of hypomere, in second shunt at strainer 7 places, be provided with spiral-lobe compressor washing composition water cooler 63; All for cooling washing composition.
Water coolant subsystem comprises female pipe and seven arms that are set up in parallel, wherein five arms are for coke-oven gas in cooling centrifugal compressor water cooler, article one, for 62, one of direct-cooled tower water recirculators of cooling hypomere for cooling screw compressor washing composition water cooler 63.The direct-cooled tower deep cooling of epimere watercooler 61 can be undertaken cooling by 16 DEG C of lithium bromide refrigerating water.In the present invention in cooling subsystem the trend of water coolant as shown in the dotted line with arrow in Fig. 1.
In actual motion, enter spiral-lobe compressor from the coke-oven gas of coke-oven coal gas holder, normal pressure coke-oven gas is compressed to 0.45MPa, and send into direct-cooled tower after the dust in coke-oven gas and tar are filtered out.Before coke-oven gas enters spiral-lobe compressor, can by cooling through spiral-lobe compressor washing composition water cooler and be filtered after washing composition to the coke-oven gas processing of lowering the temperature.
It is further cooling that the coke-oven gas that enters direct-cooled tower enters the laggard row of direct-cooled tower, and its temperature is down to below 21 DEG C, removes most of tar and fine breeze simultaneously, and then continue supercharging through Pyatyi Systems of Centrifugal Compressor Unit.Between each section of Systems of Centrifugal Compressor Unit, be equipped with centrifugal compressor water cooler, after each section of centrifugal compressed, temperature is not passed through centrifugal compressor water cooler from top to bottom higher than the coke-oven gas of 85 DEG C, in centrifugal compressor water cooler, spray water coolant and washing composition from top to bottom continuously simultaneously, dissolve the ammonium salt that coal gas compression process of cooling generates, the polymerization dope and the solid elemental sulfur etc. that in fine breeze, tar, naphthalene and the coal gas compression process of cooling of simultaneously avoiding coal gas to carry secretly, form.Like this, after last step centrifugal compressor water cooler, temperature is the relevant operation that coke-oven gas that 40 DEG C, air pressure are 1.6 ~ 3.5MPa can be sent to pressure swing adsorption hydrogen production or synthetic ammonia and LNG device.
In the present invention, the female Guan Zhongke of the leading portion of washing subsystem arranges washing composition force (forcing) pump 5, improves the flow capacity of washing composition.
Claims (8)
1. coke oven gas system is carried in screw rod and the compression of multistage centrifugal chiller, it is characterized in that: comprise parallel coke-oven gas compression transport subsystem and the water coolant subsystem arranging; Described coke-oven gas compression subsystem comprises the spiral-lobe compressor (1), direct-cooled tower (2) and the multistage centrifugal compressor group that are arranged on coke-oven coal gas holder exit and are communicated with successively by gas line, and wherein the rear end of every grade of Systems of Centrifugal Compressor Unit all arranges a vertical row tubular type centrifugal compressor water cooler; Described water coolant subsystem comprise female pipe with mother manage be communicated be set up in parallel be applied to mutually the arm of coke-oven gas in cooling centrifugal compressor water cooler with centrifugal compressor water cooler quantity.
2. coke oven gas system is carried in screw rod according to claim 1 and the compression of multistage centrifugal chiller, it is characterized in that: described direct-cooled tower comprises the direct-cooled tower of the epimere being connected and the direct-cooled tower of hypomere, after the coke-oven gas of drawing from spiral-lobe compressor is sent in the direct-cooled tower of hypomere, discharge through the direct-cooled top of tower of epimere.
3. coke oven gas system is carried in screw rod according to claim 1 and the compression of multistage centrifugal chiller, it is characterized in that: also comprise and the parallel washing subsystem arranging of coke-oven gas compression transport subsystem, washing composition in described washing subsystem is sent into direct-cooled tower middle part through final stage centrifugal compressor water cooler successively against coke-oven gas traffic direction to first step centrifugal compressor water cooler, the washing composition entering in direct-cooled tower divides two branch roads to wash the coke-oven gas in direct-cooled tower, wherein branch road is delivered to the direct-cooled top of tower of epimere from direct-cooled tower middle part through the direct-cooled tower recycle pump of epimere (21) and is sprayed downwards, another branch road is directly from the direct-cooled tower spray of direct-cooled tower middle part hypomere downwards, last washing composition is discharged through direct-cooled tower bottom.
4. coke oven gas system is carried in screw rod according to claim 3 and the compression of multistage centrifugal chiller, it is characterized in that: the washing composition Fen San road output of discharging from direct-cooled tower bottom, first is returned to the direct-cooled tower of hypomere top through the direct-cooled tower recycle pump of hypomere (22) along separate routes, second sends in the gas line before spiral-lobe compressor coke-oven gas is washed along separate routes after filter (7) filters, and the 3rd is back to washing subsystem entrance end along separate routes.
5. coke oven gas system is carried in screw rod according to claim 4 and the compression of multistage centrifugal chiller, it is characterized in that: on the branch road at the direct-cooled tower recycle pump of described epimere (21) place, be provided with the direct-cooled tower deep cooling of epimere watercooler (61), in first shunt at the direct-cooled tower recycle pump of hypomere (22) place, be provided with the direct-cooled tower water recirculator of hypomere (62), in second shunt at strainer (7) place, be provided with spiral-lobe compressor washing composition water cooler (63).
6. coke oven gas system is carried in screw rod according to claim 5 and the compression of multistage centrifugal chiller, it is characterized in that: described water coolant subsystem also comprises with mother manages the branch road for the direct-cooled tower water recirculator of cooling hypomere (62) and spiral-lobe compressor washing composition water cooler (63) being communicated with.
7. coke oven gas system is carried in screw rod according to claim 5 and the compression of multistage centrifugal chiller, it is characterized in that: the direct-cooled tower deep cooling of described epimere watercooler (61) is through 16 DEG C of lithium bromide refrigerating water coolings.
8. carry coke oven gas system according to the screw rod described in claim 3 to 7 any one and the compression of multistage centrifugal chiller, it is characterized in that: described washing composition is less salt ammonia still process dephenolize waste water.
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Cited By (2)
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| CN105570095A (en) * | 2015-12-21 | 2016-05-11 | 七台河宝泰隆煤化工股份有限公司 | Coal gas compressing method |
| CN109026854A (en) * | 2018-09-17 | 2018-12-18 | 陕西黑猫焦化股份有限公司 | A kind of coke-stove gas compressor assembly purified between grade |
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| CN109026854A (en) * | 2018-09-17 | 2018-12-18 | 陕西黑猫焦化股份有限公司 | A kind of coke-stove gas compressor assembly purified between grade |
| CN109026854B (en) * | 2018-09-17 | 2023-11-03 | 陕西黑猫焦化股份有限公司 | Compressor system capable of performing interstage purification for coke oven gas |
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Effective date of registration: 20170928 Address after: 050035 A block 55, Kunlun Avenue, Shijiazhuang hi tech Zone, Hebei, three Patentee after: Hebei synergy Water Treatment Technology Co., Ltd. Address before: Shijiazhuang circular chemical industry zone 6 Patentee before: HEBEI XIETONG ENVIRONMENTAL PROTECTION TECHNOLOGY CO., LTD. |