CN206375867U

CN206375867U - A kind of hydrogasification purified gas overbottom pressure utilizes system

Info

Publication number: CN206375867U
Application number: CN201621488862.4U
Authority: CN
Inventors: 季贵田; 张建民
Original assignee: Xinneng Energy Co Ltd
Current assignee: Xinneng Energy Co Ltd
Priority date: 2016-12-30
Filing date: 2016-12-30
Publication date: 2017-08-04
Anticipated expiration: 2026-12-30

Abstract

System is utilized the utility model discloses a kind of hydrogasification purified gas overbottom pressure, it includes feed gas chiller, scrubbing tower, pressure-reducing valve, atmospheric valve, Mathanol regenerating system, poor methanol tank and poor methanol pump, it also includes stop valve and expanding machine, the inlet port of the stop valve is connected with the inlet port of the pressure-reducing valve, the outlet port of the stop valve is connected with the air inlet of the expanding machine, and the gas outlet of the expanding machine is connected with the outlet port of the pressure-reducing valve with the inlet end of downstream line.Purified gas of the present utility model is in H₂S、CO₂Deng impurity washing it is qualified after or rear system possess connect gas when, high pressure purge gas enters expanding machine, expansion decompression, expansion impeller rotation, dragging reduction box and electrical power generators are promoted, electricity is sent and is incorporated to 10KV Intranets on the spot, for the system lean pump electricity consumption, realize energy conversion and recycle.

Description

A kind of hydrogasification purified gas overbottom pressure utilizes system

Technical field：

The utility model is related to high pressure purge gas energy utilization field, and in particular to a kind of hydrogasification purified gas overbottom pressure profit Use system.

Background technology：

As shown in figure 1, the raw gas temperature from hydrogasification is in current low-temp methanol washing process flow at home 36.2 DEG C, pressure be that 6.75MPa, flow are 58396Nm³/ h, temperature is reduced to -31 DEG C, pressure after feed gas chiller 1 6.71MPa, subsequently into scrubbing tower 2, the H in raw gas is removed by washing₂S、CO₂Turn into purified gas, this purified gas Deng impurity Temperature is -51 DEG C, and pressure is 6.665MPa, enters back into after feed gas chiller 1 and to be exchanged heat with high temperature rough gas, temperature is changed into 30 DEG C, pressure 6.635MPa, this burst of purified gas after heat exchange is in H₂S、CO₂Before not having washing qualified Deng impurity, or rear system does not possess Connect before gas and to be put by atmospheric valve 4 to torch burning, this burst of purified gas is in H₂S、CO₂Deng impurity washing it is qualified after, or rear system possesses When connecing gas, down-stream system is delivered to by sending out pressure-reducing valve 3.Now, the purified gas temperature of feeding down-stream system is -13.5 DEG C, pressure Power is 3.05M Pa, the loss that purification atmospheric pressure causes big energy is discharged using pressure-reducing valve 3, with 2668.7kmol/hr flows Exemplified by, purified gas is depressurized to 3056kPa from 6635kPa, causes the nearly 1000KW of energy loss using the decompression of pressure-reducing valve 3, very may be used Cherish.

Utility model content：

The purpose of this utility model is that providing a kind of hydrogasification purified gas overbottom pressure utilizes system, solves current methanol and washes In technological process, the problem of a large amount of energy losses are caused using pressure-reducing valve decompression.

In order to solve the above-mentioned technical problem, the utility model utilizes system there is provided a kind of hydrogasification purified gas overbottom pressure, It includes feed gas chiller, scrubbing tower, pressure-reducing valve, atmospheric valve, Mathanol regenerating system, poor methanol tank and poor methanol pump, described The two ends of pressure-reducing valve are parallel with expanding machine and stop valve；One end of the stop valve and the entrance of the expanding machine are connected by pipeline Connect, the other end of the stop valve is connected by pipeline with the pressure-reducing valve two ends respectively with the outlet of the expanding machine.

Advantage of the present utility model：Purified gas of the present utility model is in H₂S、CO₂Deng impurity washing it is qualified after, or rear system Possess when connecing gas, high pressure purge gas enters expanding machine, expansion decompression promotes expansion impeller rotation, dragging reduction box and generator Generate electricity, send electricity and be incorporated to 10KV Intranets on the spot, for the system lean pump electricity consumption, realize energy conversion and recycle；Separately Outside, the bypass by-pass with pressure-reducing valve is arranged in parallel with expansion power generation unit, it is quick to open bypass pair in expansion power generator failure Pressure-reducing valve on line, simultaneously closes off the entrance stop valve into expanding machine, realizes switching, and medium continues to depressurize, and follow-up work is not influenceed The operation and operation of process system, and expansion power generator can then carry out parking maintenance.

Brief description of the drawings：

Fig. 1 is the structural representation of existing hydrogasification purification gas processing system in background technology；

Fig. 2 utilizes the structural representation of system for hydrogasification purified gas overbottom pressure in the utility model.

Brief description of the drawings is as follows：1st, feed gas chiller；2nd, scrubbing tower；3rd, pressure-reducing valve；4th, atmospheric valve；5th, Mathanol regenerating system System；6th, poor methanol tank；7th, poor methanol pump；8th, expanding machine；9th, stop valve.

Embodiment：

To make the technical problems to be solved in the utility model, technical scheme and advantage clearer, below in conjunction with accompanying drawing And specific embodiment is described in detail.

As shown in Fig. 2 utilizing system there is provided a kind of hydrogasification purified gas overbottom pressure in embodiment of the present utility model System, it includes feed gas chiller 1, scrubbing tower 2, pressure-reducing valve 3, atmospheric valve 4, Mathanol regenerating system 5, poor methanol tank 6, poor methanol Pump 7, stop valve 9 and expanding machine 8, the inlet port of stop valve 9 are connected with the inlet port of pressure-reducing valve 3, the gas outlet of stop valve 9 End is connected with the inlet port of expanding machine 8, gas outlet and air inlet of the outlet port of pressure-reducing valve 3 with downstream line of expanding machine 8 End connection.

Handling process:36.2 DEG C of raw gas temperature, pressure 6.75MPa, flow from hydrogasification are 58396Nm3/h, Temperature is reduced to -31 DEG C, pressure 6.71MPa after feed gas chiller 1, into scrubbing tower 2, is removed by washing in raw gas H₂S、CO₂Turn into purified gas Deng impurity, this purified gas temperature is reduced to -51 DEG C, and pressure is 6.665MPa, after washing again Into feed gas chiller 1, this burst of purified gas after cooling through cooler 1 is in H₂S、CO₂Before not having washing qualified Deng impurity, or after System, which does not possess, to be connect before gas, is put by atmospheric valve 4 to torch burning, and this strand of high pressure purge gas is in H₂S、CO₂Wash qualified Deng impurity Afterwards, or rear system possesses when connecing gas, high pressure purge gas enters expanding machine 8 and expands decompression, promotes expansion impeller rotation, and then drive Reduction box and electrical power generators, send electricity and are incorporated to 10KV Intranets on the spot, for the electricity consumption of poor methanol pump 7 in the system, realize Energy is converted and recycled.Purified gas temperature after expanding machine 8 is depressured cooling is changed into -13.5 DEG C, pressure 3.05M Pa, Subsequent technique system is gone successively to from the outlet of expanding machine 8.In addition, being arranged in parallel the bypass with pressure-reducing valve 3 with expansion power generation unit By-pass, in expansion power generator failure, the quick pressure-reducing valve 3 opened on bypass by-pass, the entrance simultaneously closed off into expanding machine 8 is cut Disconnected valve 9, realizes switching, and medium continues to depressurize, and does not influence the operation and operation of subsequent technique system, and expansion power generator then can be with Carry out parking maintenance.After the scrubbed tower 2 of hydrogasification raw gas is washed, the rich methanol come out from the bottom of scrubbing tower 2 by decompression, The Mathanol regenerating systems 5 such as flash distillation, stripping and hot recycling tower remove the H dissolved in methanol₂S、CO₂Turn into poor methanol after gas, enter Poor methanol tank 6, then by the pressurization feeding scrubbing tower 2 of poor methanol pump 7, realizes that low-temp methanol washes circulation.

By expansion power generation, purification atmospheric pressure is reduced to 3050kPa by 6665kPa, can generate electricity about 800 degree of electricity/hours, all For the electricity consumption of the system poor methanol pump 7.By 0.5 yuan/degree electricity, whole year by 330 days production run time calculate, can power cost saving about 316.8 ten thousand yuan, energy-saving purpose is reached.If the increased generating system equipment of expanding machine 8 presses initial value 4,500,000, using by 15 Year, 5% salvage value rate, yearly depreciation charge about 28.5 ten thousand.Unit lubricating system carries spindle nose pump, and fuel tank electric heater is also seldom to make With mainly cooling-water consumption and about 30NM3/H sealing nitrogen is consumed.Cooling water presses 10T/H, and 3 yuan/T is calculated, 1 year about 24 Ten thousand.Seal nitrogen year consumption about 60,000.Consider that electrical equipment degree of protection is high, partially expensive etc. factor of price, average annual maintenance expense is about 30000 or so.Annual return 316.8-28.5-24-6-3=255.3 ten thousand, i.e., 1 year half or so can recoup capital outlay.

It should be noted that in specific embodiment of the utility model, expanding machine can be reached using any market now To the existing device of same effect, its specifically used model and manufacturer are not specifically limited herein.

Above is preferred embodiment of the present utility model, for those skilled in the art, not On the premise of departing from the utility model principle, some improvements and modifications can also be made, these improvements and modifications also should be regarded as this The protection domain of utility model.

Claims

1. a kind of hydrogasification purified gas overbottom pressure utilizes system, it include feed gas chiller, scrubbing tower, pressure-reducing valve, atmospheric valve, Mathanol regenerating system, poor methanol tank and poor methanol pump, it is characterised in that it also includes stop valve and expanding machine, the cut-out The inlet port of valve is connected with the inlet port of the pressure-reducing valve, the air inlet of the outlet port of the stop valve and the expanding machine Mouth connection, the gas outlet of the expanding machine is connected with the outlet port of the pressure-reducing valve with the inlet end of downstream line.