阅读说明：本技术 一种合成气压缩机干气密封系统 (Dry gas sealing system of synthesis gas compressor ) 是由 刘海涛 李宗学 李海东 王海云 白卫卫 李晓慧 于 2021-09-30 设计创作，主要内容包括：本申请公开了一种甲醇合成气压缩机干气密封系统,包括：甲醇合成气压缩机,甲醇合成气压缩机一侧壁设置有进气口,另一设置有出气口,合成气压缩机侧壁连接有干气储存罐,干气储存罐连接有干气流动管道,干气流动管道连接有干气密封箱,干气密封箱下方连接有导凝管,干气密封箱上方设置有高点放空,干气密封箱设置有轴承,另外,一种甲醇合成气压缩机干气密封方法,有益效果同上,避免了一级密封气进入循环段造成催化剂中毒的问题,本专利直接采用就地气源,无需增加其他附加气源处理设备,极大的减少了成本,延长了催化剂的使用寿命。(The application discloses methyl alcohol synthetic gas compressor dry gas sealing system includes: methanol synthesis gas compressor, methanol synthesis gas compressor lateral wall is provided with the air inlet, another is provided with the gas outlet, synthesis gas compressor lateral wall is connected with the dry gas holding vessel, the dry gas holding vessel is connected with dry gas flow pipeline, dry gas flow pipeline is connected with the dry gas seal box, dry gas seal box below is connected with leads and congeals the pipe, dry gas seal box top is provided with the high point and emptys, the dry gas seal box is provided with the bearing, in addition, a methanol synthesis gas compressor dry gas sealing method, beneficial effect is the same as above, the problem that one-level seal gas entering circulation section caused the catalyst poisoning has been avoided, this patent directly adopts the on-the-spot air supply, need not to increase other additional air supply treatment facility, very big reduction the cost, the life of catalyst has been prolonged.)

1. A dry gas sealing system and a dry gas sealing method for a methanol synthesis gas compressor are characterized in that the whole system comprises a steam turbine (1), a synthesis section and a circulation section; the synthesis section comprises: a fresh gas inlet (2) and a synthesis section outlet (4), the circulation section comprising: a circulating gas inlet (3) and a circulating section outlet (5).

2. The utility model provides a methanol synthesis gas compressor dry gas sealing system which characterized in that includes: compressor (6), a compressor (6) lateral wall is provided with air inlet (11), and another lateral wall is provided with gas outlet (12), compressor (6) lateral wall is connected with dry gas holding vessel (7), dry gas holding vessel (7) are connected with dry gas flow pipe way (8), dry gas flow pipe way (8) are connected with dry gas seal box (9), dry gas seal box (9) below is connected with leads congealing pipe (15), dry gas seal box (9) top is provided with high point and puts empty (14), dry gas seal box (9) are provided with bearing (10).

3. The dry gas sealing system of a methanol synthesis gas compressor as claimed in claim 1, wherein the system of claim 1 is symmetrically arranged with the synthesis gas compressor as a central axis.

4. The methanol synthesis gas compressor dry gas sealing system according to the potential claim 1, wherein a primary sealing gas source (13) is connected below the dry gas seal box (9).

5. The dry gas sealing system of the methanol synthesis gas compressor as claimed in claim 1, wherein a sealing gas outlet (16) is connected above the dry gas sealing box (9).

6. A methanol synthesis gas compressor dry gas sealing system based on any one of claims 1 to 4, characterized in that the synthesis gas compressor dry gas sealing system comprises:

introducing dry gas conveyed by a synthesis section of a dry gas sealing system into a compressor (9) and boosting the pressure to 6.7 MPa;

introducing the boosted dry gas into a fine desulfurization device of a synthesis section to remove sulfur-containing substances in the dry gas to obtain synthesis gas;

introducing the circulating gas and part of the synthetic gas conveyed by the circulating section of the compressor into the compressor and boosting the pressure to 7.1MPa,

the shaft end of the synthesis gas compressor adopts a dry gas sealing device to realize the sealing of the process gas.

7. The dry gas sealing system of the methanol synthesis gas compressor as claimed in claim 5, wherein the primary seal gas is sealed by using the recycle section outlet gas as the dry gas.

8. The dry gas sealing system of the methanol synthesis gas compressor as claimed in claim 6, wherein the primary seal gas source (13) directly utilizes the compressor outlet gas.

Technical Field

The application relates to the field of gas sealing, in particular to a dry gas seal of a synthesis gas compressor.

Background

The primary sealing gas and the secondary sealing gas of the existing dry gas sealing system are both originated from fresh gas from the previous working section, and the sulfur content in the fresh period is about 10 ppm. The gas pressure at the high-pressure end of the compressor shaft is 5.8MPa, the gas pressure at the low-pressure end of the compressor shaft is 2.7MPa, the pressure of the dry gas sealed primary sealing gas is 5.8MPa, in the running process of the compressor, part of the primary sealing gas enters the circulating section of the compressor through the shaft end seal of the compressor, and the fresh gas entering the compressor enters the methanol synthesis tower together with the circulating gas to carry out methanol synthesis reaction. The catalyst used in the methanol synthesis reaction is a copper-based catalyst, and sulfur in fresh gas reacts with the copper-based catalyst, so that the catalyst is poisoned. The sulfur in the fresh gas will react with it, causing catalyst poisoning.

The pressure of the dry gas seal primary seal gas is higher than the seal pressure of the shaft end of the compressor, the gas at the outlet of the circulation section is used as the primary seal gas, the sulfur content in the gas is controlled to be minimum while the pressure of the gas meets the use requirement, and the problem that the catalyst is poisoned when the primary seal gas enters the circulation section is avoided; the catalyst directly adopts an in-situ gas source, does not need to add other additional gas source treatment equipment, greatly reduces the cost and prolongs the service life of the catalyst.

Disclosure of Invention

The application provides a dry gas sealing system and a dry gas sealing method for a methanol synthesis gas compressor, wherein the pressure of a dry gas sealing primary sealing gas is higher than the sealing pressure of the shaft end of the compressor; the catalyst directly adopts an in-situ gas source, does not need to add other additional gas source treatment equipment, greatly reduces the cost and prolongs the service life of the catalyst.

The application provides a dry gas sealing system and a dry gas sealing method for a methanol synthesis gas compressor, wherein the whole system comprises a steam turbine, a synthesis section and a circulation section; the synthesis section comprises: a fresh gas inlet and a synthesis section outlet, the recycle section comprising: a recycle gas inlet and a recycle section outlet.

A dry gas sealing system and a sealing method for a methanol synthesis gas compressor comprise the following steps: methyl alcohol synthetic gas compressor, methyl alcohol synthetic gas compressor lateral wall are provided with the air inlet, and another is provided with the gas outlet, and the synthetic gas compressor lateral wall is connected with the dry gas holding vessel, and the dry gas holding vessel is connected with dry gas flow pipeline, and dry gas flow pipeline is connected with dry gas seal box, and dry gas seal box below is connected with leads and congeals the pipe, and dry gas seal box top is provided with the high point and emptys, and dry gas seal box is provided with the bearing.

Further, a dry gas sealing system of a synthesis gas compressor takes the synthesis gas compressor as a central axis, and the system of claim 1 is symmetrically arranged.

Furthermore, a primary sealing gas source inlet is connected below the dry gas sealing box.

Furthermore, a sealing gas outlet is connected above the dry gas sealing box.

A dry gas sealing system and a sealing method for a methanol synthesis gas compressor comprise the following steps:

a dry gas sealing method for a methanol synthesis gas compressor, based on the synthesis gas compressor sealing system of any one of claims 1 to 4, the dry gas sealing system for the synthesis gas compressor comprising:

introducing dry gas conveyed by a synthesis section of a dry gas sealing system into a compressor and boosting the pressure to 6.7 MPa;

introducing the boosted dry gas into a fine desulfurization device of a synthesis section to remove sulfur-containing substances in the dry gas to obtain synthesis gas;

introducing the circulating gas and part of the synthetic gas conveyed by the circulating section of the compressor into the compressor and boosting the pressure to 7.1MPa,

the shaft end of the synthesis gas compressor adopts a dry gas sealing device to realize the sealing of the process gas.

Further, the gas at the outlet of the circulation section is used as dry gas to seal the primary sealing gas.

Furthermore, the primary seal gas source directly utilizes the gas at the outlet of the compressor.

According to the technical scheme, the application provides a dry gas sealing system and a dry gas sealing method for a methanol synthesis gas compressor, and the whole system comprises a steam turbine, a synthesis section and a circulation section; the synthesis section comprises: a fresh gas inlet and a synthesis section outlet; the circulation section includes: a recycle gas inlet and a recycle section outlet.

A synthesis gas compressor dry gas seal system, comprising: methanol synthesis gas compressor, methanol synthesis gas compressor lateral wall are provided with the air inlet, and another is provided with the gas outlet, synthesis gas compressor lateral wall is connected with the dry gas holding vessel, the dry gas holding vessel is connected with the dry gas pipeline that flows, the dry gas pipeline that flows is connected with the dry gas seal box, dry gas seal box below is connected with leads and congeals the pipe, dry gas seal box top is provided with the high point and emptys, the dry gas seal box is provided with the bearing. A dry gas sealing system of a synthesis gas compressor, which takes the synthesis gas compressor as a central axis and is symmetrically provided with the system of claim 1. The lower part of the dry gas seal box is connected with a primary seal gas source inlet. A primary sealing gas source outlet is connected above the dry gas sealing box.

A dry gas sealing method for a methanol synthesis gas compressor comprises the following steps:

the methanol synthesis gas compressor is divided into a synthesis section and a circulation section, wherein in the synthesis section, fresh gas conveyed from the previous section is boosted to 6.7MPa by the synthesis gas compressor, and the boosted fresh gas enters a fine desulfurization section of the synthesis device to remove sulfur-containing substances in the gas; and the circulating gas and a part of the synthetic gas conveyed from the synthesis section of the circulating section enter a circulating gas compressor, and the gas is further pressurized to 7.1MPa by the circulating gas compressor and is conveyed to a synthesis device. The shaft end of the synthesis gas compressor adopts a dry gas sealing device to realize the sealing of the process gas. And the circulation section changes the original primary sealing gas source from fresh section outlet gas into circulation section outlet gas according to the medium pressure of the high-pressure side and the low-pressure side of the compressor cylinder body. The pressure of the primary seal gas of the dry seal gas of the circulating gas is higher than the seal pressure of the shaft end of the compressor, the gas at the outlet of the circulating section is used as the primary seal gas, the sulfur content in the gas is controlled to be minimum while the pressure of the gas meets the use requirement, and the problem of catalyst poisoning caused by the fact that the primary seal gas enters the circulating section is avoided; the on-site gas source is directly adopted, and other additional gas source processing equipment is not required to be added. After the method is practically applied, according to the analysis of the production running condition, when a dry gas sealing primary sealing gas source of a synthesis gas compressor adopts a fresh section gas, the service life of a methanol synthesis catalyst is about 2 years; after the primary sealed gas source is replaced by the gas at the outlet of the circulating section, the service life of the catalyst is prolonged by nearly 0.5 year, and the yield of the product methanol is stable.

Drawings

In order to more clearly illustrate the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without any creative effort.

FIG. 1 is a process medium gas circuit diagram of a methanol synthesis compressor.

Fig. 2 is a gas path diagram of the dry gas sealing system.

Fig. 3 is an auxiliary view of the gas circuit according to the present application.

Fig. 4 is an auxiliary view of the gas circuit according to the present application.

FIG. 5 is a secondary assistant understanding diagram.

Illustration of the drawings:

the system comprises a steam turbine 1, a fresh gas inlet 2, a circulating gas inlet 3, a synthesis section outlet 4, a circulation section outlet 5, a synthesis gas compressor 6, a dry gas storage tank 7, a dry gas flow pipeline 8, a dry gas seal box 9, a bearing 10, an air inlet 11, an air outlet 12, a primary seal gas source 13, a high-point air release 14, a condensation guide pipe 15 and a seal gas outlet 16.

Detailed Description

In order to make those skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings.

Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope of the disclosure being indicated by the following claims.

It will be understood that the present application is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The above-described embodiments of the present application do not limit the scope of the present application.

The technical proposal can be known as the proposal shown in figure 1, figure 2, figure 3, figure 4 and figure 5

Example 1:

a dry gas sealing system and a dry gas sealing method for a methanol synthesis gas compressor are disclosed, wherein the whole system comprises a steam turbine 1, a synthesis section and a circulation section; the synthesis section comprises: a fresh gas inlet 2 and a synthesis section outlet 4; the circulation section includes: a recycle gas inlet 3 and a recycle section outlet 5. The specific sealing system and sealing method are as follows:

a methanol synthesis gas compressor dry gas seal system, comprising: methyl alcohol synthetic gas compressor, 6 lateral walls of methyl alcohol synthetic gas compressor are provided with the air inlet, and another is provided with the gas outlet, and 6 lateral walls of synthetic gas compressor are connected with dry gas holding vessel 7, dry gas holding vessel 7 is connected with dry gas flow pipeline 8, and dry gas flow pipeline 8 is connected with dry gas seal box 9, and dry gas seal box 9 below is connected with leads and congeals pipe 15, and dry gas seal box top is provided with high point unloading 14, and dry gas seal box 9 is provided with bearing 10.

Preferably, the methanol synthesis gas compressor dry gas sealing system takes the synthesis gas compressor 1 as a central axis, the system of claim 1 is symmetrically arranged, and the whole methanol synthesis gas compressor dry gas sealing system is arranged in a bilateral symmetry manner.

Preferably, a primary sealing gas source inlet is connected below the dry gas sealing box 9.

Preferably, a primary sealing gas source outlet is connected above the dry gas sealing box.

A dry gas sealing method for a methanol synthesis gas compressor is characterized by comprising the following steps:

the methanol synthesis gas compressor is divided into a synthesis section and a circulation section (see fig. 1), wherein the synthesis section: fresh gas (temperature: 35 ℃, pressure: 3.17MPa) conveyed from the previous section is increased to 6.7MPa through a synthesis gas compressor (152C001), and enters a fine desulfurization section of a synthesis device to remove sulfur-containing substances in the gas; a circulation section: the recycle gas and a part of the synthesis gas (temperature: 49 ℃, pressure: 6.05MPa) delivered from the synthesis section enter a recycle gas compressor, and the part of the gas is further pressurized to 7.1MPa by the recycle gas compressor (152C002) and sent to a synthesis device.

And the shaft end of the synthesis gas compressor 6 adopts a dry gas sealing device to realize the sealing of the process gas.

Preferably, the circulation section changes the original primary sealing gas source from the fresh section outlet gas to the circulation section outlet gas according to the medium pressure of the high-pressure side and the low-pressure side of the compressor cylinder body.

Preferably, the pressure of the primary seal gas of the dry seal of the circulating gas is higher than the seal pressure of the shaft end of the compressor, the gas at the outlet of the circulating section is used as the primary seal gas, the sulfur content in the gas is controlled to be minimum while the pressure of the gas meets the use requirement, and the problem of catalyst poisoning caused by the fact that the primary seal gas enters the circulating section is avoided; the on-site gas source is directly adopted, and other additional gas source processing equipment is not required to be added.