CN210825995U - Device for comprehensive utilization of methanol low-pressure flash expansion tank gas - Google Patents
Device for comprehensive utilization of methanol low-pressure flash expansion tank gas Download PDFInfo
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- CN210825995U CN210825995U CN201921900932.6U CN201921900932U CN210825995U CN 210825995 U CN210825995 U CN 210825995U CN 201921900932 U CN201921900932 U CN 201921900932U CN 210825995 U CN210825995 U CN 210825995U
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Abstract
The utility model discloses a device for comprehensive utilization of methanol low-pressure flash evaporation expansion tank gas, synthetic methanol is condensed at high pressure and then enters a low-pressure expansion tank for decompression and flash evaporation, the flash evaporation gas comprises saturated methanol steam, and in addition, dissolved hydrogen, carbon monoxide, carbon dioxide and the like are all raw material gases for methanol synthesis; the device also comprises a methanol washing tower, a compressor and an intersegment cooling separator, wherein methanol is recovered through the washing tower, the pressure of the gas is increased through the compressor, the gas returns to the high-pressure synthesis system for continuous recycling, and intersegment condensate of the compressor is discharged into a low-pressure expansion tank; and the liquid in the low-pressure expansion tank and the liquid after the water washing tower are sent to a downstream rectifying device together.
Description
Technical Field
The utility model belongs to the technical field of the methyl alcohol is synthetic, a gaseous device of utilizing comprehensively of methyl alcohol low pressure flash evaporation expansion tank is related to.
Background
In methanol synthesis, high pressure is generally required during gas reaction synthesis, and low pressure is required in the product refining process; flash evaporation exists during the transportation or conversion of high and low pressure materials, and dissolved gases are more or less flashed out in the liquid product according to the solubility. The flashed off gas comprises the saturated gaseous products as well as the feed gas required for the synthesis plant.
The methanol synthesis reaction is that hydrogen, carbon monoxide and carbon dioxide generate methanol under the action of a catalyst at 5.0MPa, 200 ℃ and a fresh gas hydrogen-carbon ratio of about 2.05. The reaction equation is as follows:
CO+2H2----CH3OH CO2+3H2---CH3OH+H2O；
the proper proportion of carbon dioxide is about 3.5 percent, and CO2Can reduce the content of ethanol, protect the heat load of the catalyst, and inhibit the generation of other by-products by the water generated in the reaction.
Energy conservation and consumption reduction are key points for enhancing the benefit of each enterprise, and the comprehensive utilization of gas is important. The gases of the process can be used to produce products more economically than they can be used as fuels. The gas in the methanol low-pressure flash tank contains 48 percent of CO2，H2CO 50%, and the rest 2% of inert gas, which has a common heat value and is not beneficial to combustion; but CO2The method is also very important for synthesis reaction, especially for coal gasification enterprises mainly producing gas, the residual gas is subjected to a process or a device for producing methanol by adjusting the proportion, and CO2The content is difficult to control to be about 3.5 percent.
Therefore, how to reasonably optimize the prior device and comprehensively utilize the gas in the methanol low-pressure expansion tank can improve the CO content of the system2Content, and increase product yield and quality.
Disclosure of Invention
An object of the utility model is to provide a gaseous comprehensive utilization's of methyl alcohol low pressure flash distillation expansion tank device solves the gaseous recycle's of methyl alcohol low pressure flash distillation expansion tank technical problem, through the reasonable optimization to current device, effectively utilizes low pressure flash distillation gas, and the methyl alcohol in the abundant recovery material reduces CO2To increase the CO content of the raw gas in the methanol process2Content, product yield increase and economic benefit increase.
The utility model adopts the following technical scheme:
the utility model provides a gaseous device of utilizing multipurposely of methyl alcohol low pressure flash distillation expansion tank, includes methyl alcohol separator and methyl alcohol expansion tank, and the thick methyl alcohol of methyl alcohol separator bottom gets into the methyl alcohol expansion tank, and the thick methyl alcohol pipeline of methyl alcohol expansion tank bottom is connected to rectifier unit, a serial communication port, the device still includes methyl alcohol scrubbing tower, compressor and intersegment cooling separator, and gaseous earlier through the methyl alcohol scrubbing tower after the low pressure flash distillation of methyl alcohol expansion tank top, the top of the tower gas gets into the compressor again and steps up, and the in-process intersegment condensate that steps up gets into the methyl alcohol expansion tank through intersegment cooling separator, and the gaseous methyl alcohol separator that incorporates into of stepping up, and washing tower kettle liquid pipeline is connected.
The methanol washing tower is filled with regular packing, desalted water at the top enters through a liquid distributor, low-pressure flash gas enters from a gas distributor at the bottom of the tower, the gas and the liquid are in countercurrent contact in the tower, thermometers are respectively arranged at the top of the tower and the bottom of the tower, and the washing tower further comprises a desalted water inlet flow meter and a tower bottom automatic control liquid level meter.
The compressor be piston compressor, preferred tertiary or level four compression, the compressor entry sets up atmospheric valve and return valve, prevents to use under the compressor trouble condition, gaseous entering intersegmental cooling separator behind the compressor, the liquid discharge in the separator methanol expansion tank. The inlet and outlet of the compressor are provided with temperature monitoring, and the intersegment cooling separator is provided with liquid level monitoring.
Preferably, a buffer tank is arranged between the methanol water washing tower and the compressor.
Has the advantages that: the utility model discloses a device that gaseous comprehensive utilization of methyl alcohol low pressure flash distillation expansion tank washed, compresses the condensation back to methyl alcohol low pressure flash distillation gas and recycle, can retrieve the methyl alcohol that wherein contains in daily operation, and the reduction discharges methyl alcohol content in the flash distillation gas of torch, can also supply carbon dioxide with raw material atmospheric pressure withdrawal system wherein, and the effective gas of recovery can also produce methyl alcohol more.
Drawings
FIG. 1 is a schematic structural view of a device for comprehensive utilization of methanol low-pressure flash expansion tank gas;
wherein: 1. the device comprises a methanol separator, 2, a methanol expansion tank, 3, a methanol water washing tower, 4, a regulating valve, 5, a buffer tank, 6, a compressor, 7 and an intersegmental cooling separator.
Detailed Description
The following detailed description of the embodiments of the present invention is provided, but it should be noted that the scope of the present invention is not limited by the embodiments, but is defined by the appended claims.
The annual methanol production device of 30 ten thousand tons has the methanol expansion low-pressure flash gas of about 1000m3And in the reaction system, the methanol vapor is carried by 0.13 ton per hour, the main components of the gas, such as hydrogen, carbon monoxide, carbon dioxide and the like, are all raw material gases for generating the methanol through the high-pressure reaction of the synthesis system, and the raw material gases are pressurized by a compressor and then recycled, so that more methanol can be produced. At present, the carbon dioxide content in the methanol synthesis process is controlled to be 2.5 percent for a long time in a production mode mainly supplying gas products, and is difficult to improve.
The utility model discloses a gaseous device of utilizing multipurposely of methyl alcohol low pressure flash distillation expansion tank is that after high pressure methyl alcohol separator 1 got into low pressure methyl alcohol expansion tank 2, one set of facility of the gaseous follow-up processing that the flash distillation came out, including methyl alcohol washing tower 3, compressor 6 and intersegment cooling separator 7. Through the utility model discloses a device, earlier washing retrieves saturated methyl alcohol in the gas phase, recompresses gaseous high-pressure system that returns after shrinking, and the recovery of loss and effective gas hydrogen and carbon monoxide of carbon dioxide among the replenishment system recycles, reaches the improvement of product output.
The utility model provides a gaseous device of utilizing multipurposely of methyl alcohol low pressure flash evaporation expansion tank, as shown in figure 1, including high pressure methyl alcohol separator 1, low pressure methyl alcohol expansion tank 2, methyl alcohol washing tower 3, compressor 6 and intersegment cooling separator 7, the thick methyl alcohol of methyl alcohol separator 1 bottom gets into methyl alcohol expansion tank 2, thick methyl alcohol pipe connection is to rectifier unit at the bottom of methyl alcohol expansion tank 2, gaseous earlier through methyl alcohol washing tower 3 after the 2 top low pressure flash distillations of methyl alcohol expansion tank, the top of the tower gas gets into compressor 6 again and steps up, the intersegment condensate gets into low pressure methyl alcohol expansion tank 2 through intersegment cooling separator 7 among the in-process that steps up, the gas that steps up merges into methyl alcohol separator 1, 3 tower bottom liquid pipeline of methyl alcohol washing tower are connected.
The methanol washing tower 3 is characterized in that the internal parts are regular packing, the diameter of the tower is small, the middle section is in flange connection, the packing is arranged inside, desalted water at the top enters through a liquid distributor, low-pressure flash evaporation gas enters from a tower bottom gas distributor, the gas and the liquid are in countercurrent contact in the tower, the tower bottom at the top of the tower is provided with a thermometer respectively, and the methanol washing tower also comprises a desalted water inlet flow meter and a tower bottom automatic control liquid level meter.
The compressor 6 is a piston compressor, preferably three-stage or four-stage compression, an inlet of the compressor 6 is provided with an air release valve and a return valve to prevent the compressor from being used under the condition of failure, compressed gas enters the intersegmental cooling separator 7, and liquid in the separator is discharged into the methanol expansion tank 2. The inlet and outlet of the compressor 6 are provided with temperature monitoring, and the intersegment cooling separator 7 is provided with liquid level monitoring.
A buffer tank 5 is arranged between the methanol water washing tower 3 and the compressor 6.
The device is adopted to comprehensively utilize the low-pressure flash evaporation gas, after subsequent washing and compression systems are subjected to purging, air tightness and replacement, and qualified debugging, desalted water is put into the top of the washing tower, and the low-pressure methanol expansion tank gas is introduced into the washing tower and discharged to the emptying valve at the inlet of the compressor; starting a compressor, slowly introducing flash evaporation gas into the compressor, boosting the pressure to the system pressure, and opening an outlet valve of the compressor to enter a pipeline behind the high-pressure methanol separator; after the liquid level of the washing tower is normal, the liquid level automatically enters a rectifying device, and the liquid level in the compressor intersegmental separator is discharged discontinuously and enters a methanol expansion tank.
Aiming at two sets of 30 ten thousand tons of methanol devices, 1000-square CO can be reduced by comprehensively utilizing the gas2Can increase system CO20.5 percent; the methanol can be directly washed by water to recover about 3 tons of methanol for one day; the compressed effective gas of 1000 square can produce 0.45 ton methanol per hour. After the device of the utility model is added, 4800 tons of methanol (calculated according to 350 days) can be directly added in annual output.
Claims (7)
1. The utility model provides a gaseous device of utilizing multipurposely of methyl alcohol low pressure flash distillation expansion tank, includes methyl alcohol separator and methyl alcohol expansion tank, and the thick methyl alcohol of methyl alcohol separator bottom gets into the methyl alcohol expansion tank, and the thick methyl alcohol pipeline in methyl alcohol expansion tank bottom is connected to rectifier unit, a serial communication port, the device still includes methyl alcohol scrubbing tower, compressor and intersegment cooling separator, and gaseous earlier through the methyl alcohol scrubbing tower after the flash distillation of methyl alcohol expansion tank top, top of the tower gas gets into the compressor again and steps up, and the in-process intersegment condensate that steps up gets into the methyl alcohol expansion tank through intersegment cooling separator, and the gaseous methyl alcohol separator that incorporates into of stepping up, and the scrubbing tower kettle liquid pipeline is connected to.
2. The apparatus for comprehensive utilization of methanol low-pressure flash expansion tank gas as claimed in claim 1, wherein the water scrubber is a structured packing tower, desalted water enters the liquid distributor from the top, and low-pressure flash gas enters the tower bottom gas distributor.
3. The device for comprehensively utilizing the gas in the low-pressure methanol flash expansion tank as claimed in claim 2, wherein a flow meter is arranged on the desalted water at the top of the water scrubber, and an automatic control liquid level meter is arranged at the bottom of the water scrubber.
4. The apparatus for comprehensive utilization of methanol low-pressure flash expansion tank gas as claimed in claim 1, wherein the compressor is a piston compressor, three-stage or four-stage compression.
5. The device for comprehensively utilizing the gas in the low-pressure flash expansion tank of the methanol as claimed in claim 1, wherein an inlet and an outlet of the compressor are provided with a blow-down valve and a return valve; and displaying the pressure and temperature at the inlet and the outlet of the compressor and displaying the flow at the outlet.
6. The apparatus for comprehensive utilization of methanol low-pressure flash expansion tank gas as claimed in claim 1, wherein the interstage cooling separator is provided with liquid level monitoring.
7. The device for comprehensively utilizing the gas in the low-pressure flash expansion tank of the methanol as claimed in claim 1, wherein a buffer tank is arranged between the methanol water washing tower and the compressor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921900932.6U CN210825995U (en) | 2019-11-06 | 2019-11-06 | Device for comprehensive utilization of methanol low-pressure flash expansion tank gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921900932.6U CN210825995U (en) | 2019-11-06 | 2019-11-06 | Device for comprehensive utilization of methanol low-pressure flash expansion tank gas |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210825995U true CN210825995U (en) | 2020-06-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921900932.6U Active CN210825995U (en) | 2019-11-06 | 2019-11-06 | Device for comprehensive utilization of methanol low-pressure flash expansion tank gas |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210825995U (en) |
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2019
- 2019-11-06 CN CN201921900932.6U patent/CN210825995U/en active Active
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