CN213357402U - Methyl nitrite tail gas treatment pressurization system - Google Patents
Methyl nitrite tail gas treatment pressurization system Download PDFInfo
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- CN213357402U CN213357402U CN202022147671.4U CN202022147671U CN213357402U CN 213357402 U CN213357402 U CN 213357402U CN 202022147671 U CN202022147671 U CN 202022147671U CN 213357402 U CN213357402 U CN 213357402U
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Abstract
The utility model discloses a methyl nitrite tail gas treatment pressurization system, which comprises a liquid ring compressor; an exhaust port of the liquid ring compressor is communicated with an air inlet of a gas-liquid separator, and an exhaust port at the top end of the gas-liquid separator is communicated with a methyl nitrite recovery tower; and a liquid outlet at the bottom of the gas-liquid separator is communicated with the cylinder of the liquid ring compressor through a liquid outlet pipe. The advantages are that: the liquid ring compressor is used for pressurizing tail gas introduced by a tail gas pipeline, the pressurized tail gas is sent into a gas-liquid separator, gas and liquid in the tail gas are effectively separated through the gas-liquid separator, the separated gas is discharged into a methyl nitrite recovery tower through an exhaust pipe and is further treated, and the separated methanol liquid is conveyed into a cylinder of the liquid ring compressor through a liquid discharge pipe under the action of the gas pressure in the gas-liquid separator to be used as an operation medium of the liquid ring compressor; the method has the advantages of simple pressurizing flow, less used equipment, small occupied space and low cost, and is favorable for improving the pressurizing treatment efficiency of the tail gas.
Description
The technical field is as follows:
the utility model relates to a chemical industry tail gas treatment technical field, in particular to methyl nitrite tail gas treatment pressurization system.
Background art:
in order to recycle methyl nitrite and nitrogen elements in the tail gas, it is necessary to pressurize the tail gas and send the pressurized tail gas into a methyl nitrite recovery tower, recover methyl nitrite in the tail gas in the methyl nitrite recovery tower, and react the recovered nitric oxide with introduced oxygen and methanol to produce methyl nitrite.
At present, a pressurizing system adopted for pressurizing tail gas comprises a reciprocating compressor, two coolers and two gas-liquid separators, the reciprocating compressor sequentially pressurizes the tail gas in a first stage and a second stage, the first stage pressurizes the tail gas from 0.021MPa to 0.107MPa, and the second stage pressurizes the tail gas from 0.107MPa to 0.26 MPa; after each stage of pressurization, cooling and liquefying water vapor and methanol in the gas through a cooler, separating the liquid through a gas-liquid separator, and discharging the gas to a methyl nitrite recovery tower; however, the pressurizing system has the disadvantages of more used equipment, high cost, complicated pressurizing process and low pressurizing efficiency; in addition, the tail gas contains acid gas, which is easy to corrode a cylinder, a piston ring and an air valve of the reciprocating compressor, thereby improving the maintenance cost of equipment and influencing the production efficiency.
The utility model has the following contents:
an object of the utility model is to provide a methyl nitrite tail gas treatment pressurization system that is favorable to simplifying the pressurization flow, reduce cost and improve pressurization efficiency.
The utility model discloses by following technical scheme implement: a methyl nitrite tail gas treatment pressurization system comprises a liquid ring compressor and a gas-liquid separator; the gas inlet of the liquid ring compressor is communicated with a tail gas pipeline, the gas outlet of the liquid ring compressor is communicated with the gas inlet of the gas-liquid separator, and the gas outlet at the top end of the gas-liquid separator is communicated with the methyl nitrite recovery tower through a gas exhaust pipe; and a liquid outlet at the bottom of the gas-liquid separator is communicated with the cylinder of the liquid ring compressor through a liquid discharge pipe.
Further, a safety pressure relief valve is communicated and arranged at the top of the gas-liquid separator.
Furthermore, a heat exchanger is arranged on the liquid discharge pipe, and a cooling water inlet pipe and a cooling water outlet pipe are communicated with the heat exchanger.
Furthermore, a flow meter and a thermometer are arranged on the liquid discharge pipe at the outlet of the heat exchanger.
Furthermore, a main filter is arranged on the liquid discharge pipe at the liquid inlet of the heat exchanger, and a main on-off valve is respectively arranged at the inlet and the outlet of the main filter.
Furthermore, an auxiliary filter connected in parallel with the main filter is arranged on the liquid discharge pipe, and an inlet and an outlet of the auxiliary filter are respectively provided with an auxiliary on-off valve.
Furthermore, a check valve is arranged on the exhaust pipe.
Further, the tail gas pipeline is communicated with the exhaust pipe at the inlet of the check valve through an air supplementing pipe, and an electric valve is arranged on the air supplementing pipe; the tail gas pipeline is provided with a pressure transmitter, the pressure transmitter is electrically connected with the input end of a first controller, and the output end of the first controller is electrically connected with the electric valve.
Furthermore, a liquid supplementing pipe is communicated with the upper part of the gas-liquid separator, and an automatic regulating valve is arranged on the liquid supplementing pipe; the bottom of the gas-liquid separator is communicated with a liquid discharge pipe, and an electric liquid discharge valve is arranged on the liquid discharge pipe; the gas-liquid separator is provided with a liquid level transmitter, the liquid level transmitter is electrically connected with the input end of a second controller, and the output end of the second controller is electrically connected with the electric drain valve.
Furthermore, the drain outlet of the liquid ring compressor and the drain outlet of the gas-liquid separator are communicated with the liquid discharge pipe, and drain valves are arranged on the drain outlet of the liquid ring compressor and the drain outlet pipeline of the gas-liquid separator.
The utility model has the advantages that: the utility model discloses a liquid ring compressor carries out pressurization treatment to the tail gas that is introduced by the tail gas pipeline, and in tail gas after the pressurization was sent into vapour and liquid separator, the gas-liquid in the tail gas of rethread vapour and liquid separator effectively separates, and the gas of separating is discharged to methyl nitrite recovery tower in the blast pipe, further handles, and the methanol liquid through separating under the effect of vapour and liquid separator internal gas pressure, in liquid ring compressor's cylinder is carried through the fluid-discharge tube, as liquid ring compressor's running medium; the utility model discloses a pressurization flow is simple, and the equipment that uses is few, and occupation of land space is little, and is with low costs, is favorable to improving the pressurization treatment effeciency to tail gas moreover, and in addition, liquid ring compressor is applicable to the compression and has the gas of strong corrosivity, is favorable to guaranteeing production efficiency.
Description of the drawings:
fig. 1 is a schematic structural diagram of the present invention.
The parts in the drawings are numbered as follows: the device comprises a liquid ring compressor 1, a gas-liquid separator 2, a tail gas pipeline 3, an exhaust pipe 4, a methyl nitrite recovery tower 5, a liquid discharge pipe 6, a heat exchanger 7, a cooling water inlet pipe 8, a cooling water outlet pipe 9, a main filter 10, a main on-off valve 11, an auxiliary filter 12, an auxiliary on-off valve 13, a check valve 14, a gas supplementing pipe 15, an electric valve 16, a pressure transmitter 17, a first controller 18, a liquid discharge pipe 19, an electric liquid discharge valve 20, a liquid level transmitter 21, a blow-off valve 22, a liquid supplementing pipe 23, an automatic regulating valve 24, a safety pressure relief valve 25, a thermometer 26, a flowmeter 27 and a second controller 28.
The specific implementation mode is as follows:
as shown in fig. 1, a methyl nitrite tail gas treatment pressurization system comprises a liquid ring compressor 1 and a gas-liquid separator 2; the gas inlet of the liquid ring compressor 1 is communicated with the tail gas pipeline 3, the tail gas of the dimethyl oxalate synthesis system introduced from the tail gas pipeline 3 is pressurized by the liquid ring compressor 1, and the liquid ring compressor 1 is suitable for compressing gas with strong corrosivity and is beneficial to ensuring the production efficiency; an exhaust port of the liquid ring compressor 1 is communicated with an air inlet of the gas-liquid separator 2, an exhaust port at the top end of the gas-liquid separator 2 is communicated with a methyl nitrite recovery tower 5 through an exhaust pipe 4, a gas-liquid mixed material discharged from the liquid ring compressor 1 is effectively separated through the gas-liquid separator 2, the separated gas is discharged into the methyl nitrite recovery tower 5 through the exhaust pipe 4 for further treatment, and the separated liquid is remained in the gas-liquid separator 2; a liquid outlet at the bottom of the gas-liquid separator 2 is communicated with the cylinder of the liquid ring compressor 1 through a liquid outlet pipe 6, and the separated methanol is conveyed into the cylinder of the liquid ring compressor 1 through the liquid outlet pipe 6 under the action of the air pressure in the gas-liquid separator 2 and is used as an operation medium of the liquid ring compressor 1; therefore, the utility model discloses a pressurization flow is simple, and the equipment that uses is few, and is with low costs, can improve the pressurization treatment effeciency to tail gas moreover.
The top of the gas-liquid separator 2 is communicated with a safety relief valve 25, and when the pressure in the gas-liquid separator 2 exceeds a set value of the safety valve, the safety valve automatically jumps to relieve the pressure, so that the safety of the whole system is ensured; a heat exchanger 7 is arranged on the liquid discharge pipe 6, and a cooling water inlet pipe 8 and a cooling water outlet pipe 9 are communicated with the heat exchanger 7; the heat exchanger 7 can take away heat absorbed by methanol in the working process through cooling water, so that the temperature of the methanol flowing into the liquid ring compressor 1 can meet the normal operation requirement, and meanwhile, the methanol can be effectively prevented from being gasified; the liquid discharge pipe 6 at the outlet of the heat exchanger 7 is provided with a thermometer 26, the temperature of the methanol flowing into the liquid ring compressor 1 from the liquid discharge pipe 6 can be monitored in real time through the thermometer 26, and when the detected temperature is higher than a required value, the heat exchanger 7 is in failure and needs to be processed in time, or the liquid in the gas-liquid separator 2 needs to be replaced.
A main filter 10 is arranged on the liquid discharge pipe 6 at the liquid inlet of the heat exchanger 7, and a main on-off valve 11 is respectively arranged at the inlet and the outlet of the main filter 10; the impurities in the methanol are filtered through the main filter 10, so that the working efficiency of the heat exchanger 7 is ensured; the liquid discharge pipe 6 at the outlet of the heat exchanger 7 is provided with the flow meter 27, the flow meter 27 is used for detecting the flow of the methanol flowing through the liquid discharge pipe 6 in real time, the flow of the methanol flowing into the liquid ring compressor 1 from the liquid discharge pipe 6 can be determined to meet the operation requirement of the liquid ring compressor 1, and when the detected flow is lower than the required value, the main filter 10 is blocked and needs to be cleaned in time; an auxiliary filter 12 connected with the main filter 10 in parallel is arranged on the liquid discharge pipe 6, and an inlet and an outlet of the auxiliary filter 12 are respectively provided with an auxiliary on-off valve 13; when the main on-off valve 11 is blocked, the main on-off valve 11 is closed, the auxiliary on-off valve 13 is opened, and the methanol can be continuously filtered through the auxiliary filter 12, so that the normal operation of the system is ensured; the check valve 14 is arranged on the exhaust pipe 4, and the check valve 14 can prevent gas in the methyl nitrite recovery tower 5 of a subsequent high-pressure system from flowing back to the methyl nitrite tail gas treatment and pressurization system, so that the methyl nitrite tail gas treatment and pressurization system is prevented from being damaged, and potential safety hazards are avoided.
The tail gas pipeline 3 is communicated with the exhaust pipe 4 at the inlet of the check valve 14 through an air supplement pipe 15, and an electric valve 16 is arranged on the air supplement pipe 15; a pressure transmitter 17 is arranged on the tail gas pipeline 3, the pressure transmitter 17 is electrically connected with the input end of a first controller 18, and the output end of the first controller 18 is electrically connected with an electric valve 16; the inlet pressure of the liquid ring compressor 1 during normal operation must meet requirements, the pressure in the tail gas pipeline 3 can be detected in real time through the pressure transmitter 17 and fed back to the first controller 18, when the detected pressure is lower than a set lower limit value, the pressure transmitter 17 feeds back a signal to the first controller 18, the first controller 18 controls the opening of the electric valve 16, high-pressure gas is introduced from the exhaust port of the gas-liquid separator 2 and is sent to the inlet of the liquid ring compressor 1 through the air supplementing pipe 15 so as to meet the normal operation of the liquid ring compressor 1; a liquid supplementing pipe 23 is communicated with the upper part of the gas-liquid separator 2, an automatic regulating valve 24 is arranged on the liquid supplementing pipe 23, part of methanol is evaporated in the system operation process, so that the amount of methanol is reduced, and when the amount of methanol in the gas-liquid separator 2 is not enough to meet the requirement of normal operation of the liquid ring compressor 1, the methanol needs to be supplemented through the liquid supplementing pipe 23; a liquid discharge pipe 19 is communicated with the bottom of the gas-liquid separator 2, and an electric liquid discharge valve 20 is arranged on the liquid discharge pipe 19; the gas-liquid separator 2 is provided with a liquid level transmitter 21, the liquid level transmitter 21 is electrically connected with the input end of a second controller 28, and the output end of the second controller 28 is electrically connected with the electric drain valve 20; the liquid level of the liquid in the gas-liquid separator 2 can be detected in real time through the liquid level transmitter 21, when the liquid level in the gas-liquid separator 2 is lower than a set lower limit value, the liquid level transmitter 21 feeds back a signal to the second controller 28, the second controller 28 controls the automatic regulating valve 24 to be opened, methanol is supplied to the gas-liquid separator 2, when the liquid level is higher than the set upper limit value, the liquid level transmitter 21 feeds back the signal to the second controller 28, and the second controller 28 controls the automatic regulating valve 24 to be closed; when the liquid level is higher than the set upper limit value in the operation process of the methyl nitrite tail gas treatment pressurization system, the liquid level transmitter 21 feeds back a signal to the second controller 28, the second controller 28 controls the electric liquid discharge valve 20 to be opened and discharged from the liquid discharge pipe 19, and after the liquid level is lower than the set upper limit value, the liquid level transmitter 21 feeds back a signal to the second controller 28 and controls the electric liquid discharge valve 20 to be closed through the second controller 28; the sewage discharge outlet of the liquid ring compressor 1 and the sewage discharge outlet of the gas-liquid separator 2 are both communicated with the liquid discharge pipe 19, and the sewage discharge outlet of the liquid ring compressor 1 and the sewage discharge outlet pipeline of the gas-liquid separator 2 are both provided with a sewage discharge valve 22; when the methyl nitrite tail gas treatment pressurization system stops running, the blow-down valve 22 is opened, so that residual liquid in the liquid ring compressor 1 and the gas-liquid separator 2 is discharged from a blow-down outlet.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A methyl nitrite tail gas treatment pressurization system is characterized by comprising a liquid ring compressor and a gas-liquid separator; the gas inlet of the liquid ring compressor is communicated with a tail gas pipeline, the gas outlet of the liquid ring compressor is communicated with the gas inlet of the gas-liquid separator, and the gas outlet at the top end of the gas-liquid separator is communicated with the methyl nitrite recovery tower through a gas exhaust pipe; and a liquid outlet at the bottom of the gas-liquid separator is communicated with the cylinder of the liquid ring compressor through a liquid discharge pipe.
2. The methyl nitrite tail gas treatment pressurization system as set forth in claim 1, wherein a safety relief valve is provided in communication with the top of the gas-liquid separator.
3. The methyl nitrite tail gas treatment and pressurization system as set forth in claim 1, wherein a heat exchanger is installed on the liquid discharge pipe, and a cooling water inlet pipe and a cooling water outlet pipe are communicated with the heat exchanger.
4. The methyl nitrite tail gas treatment pressurization system as set forth in claim 3, wherein a flow meter and a thermometer are installed on the liquid discharge pipe at the outlet of the heat exchanger.
5. The methyl nitrite tail gas treatment and pressurization system as set forth in claim 3, wherein a main filter is installed on the liquid discharge pipe at the liquid inlet of the heat exchanger, and a main on-off valve is installed at each of an inlet and an outlet of the main filter.
6. The methyl nitrite tail gas treatment and pressurization system according to claim 5, wherein a secondary filter connected in parallel with the primary filter is installed on the liquid discharge pipe, and secondary on-off valves are installed at an inlet and an outlet of the secondary filter, respectively.
7. The methyl nitrite tail gas treatment and pressurization system as set forth in any one of claims 1 to 6, wherein a check valve is provided on the exhaust pipe.
8. The methyl nitrite tail gas treatment and pressurization system as set forth in claim 7, wherein the tail gas pipeline is communicated with the exhaust pipe at the inlet of the check valve through an air supply pipe, and an electric valve is installed on the air supply pipe; the tail gas pipeline is provided with a pressure transmitter, the pressure transmitter is electrically connected with the input end of a first controller, and the output end of the first controller is electrically connected with the electric valve.
9. The methyl nitrite tail gas treatment pressurization system as set forth in claim 8, wherein a liquid supplementing pipe is communicated with the upper part of the gas-liquid separator, and an automatic regulating valve is installed on the liquid supplementing pipe; the bottom of the gas-liquid separator is communicated with a liquid discharge pipe, and an electric liquid discharge valve is arranged on the liquid discharge pipe; the gas-liquid separator is provided with a liquid level transmitter, the liquid level transmitter is electrically connected with the input end of a second controller, and the output end of the second controller is electrically connected with the electric drain valve and the automatic regulating valve.
10. The methyl nitrite tail gas treatment pressurization system as set forth in claim 9, wherein a drain outlet of the liquid ring compressor and a drain outlet of the gas-liquid separator are both communicated with the liquid discharge pipe, and drain valves are respectively provided on the drain outlet of the liquid ring compressor and the drain outlet pipeline of the gas-liquid separator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022147671.4U CN213357402U (en) | 2020-09-25 | 2020-09-25 | Methyl nitrite tail gas treatment pressurization system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022147671.4U CN213357402U (en) | 2020-09-25 | 2020-09-25 | Methyl nitrite tail gas treatment pressurization system |
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| Publication Number | Publication Date |
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| CN213357402U true CN213357402U (en) | 2021-06-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202022147671.4U Active CN213357402U (en) | 2020-09-25 | 2020-09-25 | Methyl nitrite tail gas treatment pressurization system |
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| CN (1) | CN213357402U (en) |
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