CN111156417A

CN111156417A - Device for low-temperature methanol washing and using method thereof

Info

Publication number: CN111156417A
Application number: CN202010018768.7A
Authority: CN
Inventors: 温高峰; 郎连勇; 王涛
Original assignee: Hengli Petrochemical Dalian Refining Co Ltd
Current assignee: Hengli Petrochemical Dalian Refining Co Ltd
Priority date: 2020-01-08
Filing date: 2020-01-08
Publication date: 2020-05-15

Abstract

The invention discloses a device for low-temperature methanol washing and a using method thereof, belonging to the production field of low-temperature methanol washing devices. This device is equipped with the underground tank and stores low temperature methyl alcohol, and the underground tank bottom is equipped with that one side of pipeline and valve an links to each other, and valve an's opposite side links to each other with filter one side, and the filter opposite side links to each other with one side of self priming pump, and self priming pump opposite side links to each other with valve b one side, and valve b opposite side links to each other with the outer mouth of sending. The bottom side of the self-priming pump is connected with a valve c. Wherein the position of valve c is higher than the position of underground groove, and valve a, filter, self priming pump, valve b are in same horizontal position and all are higher than the position of valve c. The self-sucking pump is arranged on the periphery of an underground groove, the self-sucking pump does not need to enter the underground groove during daily maintenance and starting, meanwhile, the valve a is arranged at the inlet pipeline of the self-sucking pump, the self-sucking pump is convenient to be isolated and cut off for use during maintenance operation, the material leakage risk during maintenance operation is reduced, meanwhile, the maintenance operation space and conditions are convenient, and the whole maintenance time is reduced.

Description

Device for low-temperature methanol washing and using method thereof

Technical Field

The invention belongs to the production field of low-temperature methanol washing devices, and particularly relates to a low-temperature methanol washing device and a use method thereof.

Background

All discharged methanol in the low-temperature methanol washing device is collected to obtain dirty methanolIn underground tanks, and then pumped to a methanol/water separation column or H with an underground tank₂And the S concentration tower is recycled, and methanol in the system is returned to a methanol tank area storage tank during the parking and maintenance of the low-temperature methanol washing device. The dirty methyl alcohol of discharging underground tank is mostly rich methyl alcohol, and along with the rising of jar internal temperature, acid gas is analyzed out from the methyl alcohol, because of underground tank is ordinary pressure equipment, so underground tank is emptied to torch trip valve and is in normally open state, avoids underground tank superpressure. The submerged pump is characterized in that a long-shaft cantilever structure is adopted, the submerged depth needs to be controlled within 2 meters as far as possible, efficiency is greatly reduced if the submerged depth exceeds the preset value, the whole shaft is a flexible shaft, in the process of conveying polluted methanol, the bearing is continuously subjected to unilateral abrasion, the bearing is shaken if the abrasion is excessive, and then a vicious circle of the bearing abrasion is aggravated. Therefore, the damage failure rate of the submerged pump is always high, most parts with high abrasion are below the conveying medium, and accidents easily occur when the bearing is subjected to dry grinding. The difficulty of process isolation is big because of underground groove and low pressure torch system communicate with each other in the maintenance process, and submerged pump direct mount is directly over underground groove simultaneously, and the position is limited, need cooperate crane or gallows in the maintenance process, therefore dismantle on line that the maintenance safety risk is big, and is very inconvenient.

Disclosure of Invention

The problems that a bearing of a submerged pump is high in abrasion and damage probability, large in process isolation difficulty, high in online disassembly and maintenance safety risk, inconvenient and the like are solved. In order to reduce the safety risk of maintenance operation, facilitate daily maintenance and overhaul, prolong the service life of a pump and reduce the use cost, the invention provides a device for low-temperature methanol washing and a use method thereof.

A device for low-temperature methanol washing is characterized in that the device is provided with an underground tank, the bottom of the underground tank is provided with a pipeline which is connected with one side of a valve a, the other side of the valve a is connected with one side of a filter, the other side of the filter is connected with one side of a self-priming pump, the other side of the self-priming pump is connected with one side of a valve b, and the other side of the valve b is connected with an external feeding port; the bottom side of the self-priming pump is connected with a valve c; wherein the position of valve c is higher than the position of underground groove, and valve a, filter, self priming pump, valve b are in same horizontal position and all are higher than the position of valve c.

Further, the valve a (3), the valve b (4) and the valve c (5) are all automatic regulating valves.

Furthermore, a pressure gauge is arranged between the self-priming pump (2) and the valve b (4).

Further, the temperature of the bearing in the self-sucking pump (2) is not more than 70 ℃, and the temperature of the bearing in the self-sucking pump (2) is not more than 40 ℃ of the ambient temperature.

The invention also provides a using method of the device for low-temperature methanol washing, which comprises the following steps:

(1) preparation work before starting: checking whether each component is normal and whether the connection is normal;

(2) closing the valve b and the valve c, opening the valve a, opening the valve b when liquid in the underground tank enters the self-priming pump, and then opening the self-priming pump to enable the device to work;

(3) and (3) overhauling: and closing the valve a and the valve b, opening the valve c to discharge liquid, and placing blind plates at the valve a and the valve b to overhaul the self-priming pump.

Further, the checking whether each component is normal in the step (1) includes: checking whether the self-priming pump can work normally, checking whether an instrument, a valve and the instrument can work normally, and checking whether the motor steering strives for; checking whether the connection is normal includes: and checking whether the connection of the bolt, the pipeline and the lead is tight or not.

Advantageous effects of the invention

The self priming pump is installed in the underground tank periphery, the daily maintenance starts needn't get into in the underground tank, set up the ball valve in the entry pipeline department of self priming pump simultaneously, keep apart when being convenient for self priming pump to overhaul the operation and cut off the use, material leakage risk when reducing the maintenance operation, overhaul the operation space simultaneously, the condition is convenient, whole maintenance time reduces, from inhaling device spare part, do not contact with the medium, do not receive the influence of medium corrosion and impurity, high efficiency, the dependable performance, the maintenance volume is few, relative self priming pump fault number is lower than submerged pump fault number, use cost reduces.

Drawings

FIG. 1 is a schematic diagram of the apparatus for low temperature methanol washing according to the present invention.

In the figure, 1, a underground tank; 2. a self-priming pump; 3. a valve a; 4. a valve b; 5. a valve c; 6. and (3) a filter.

Detailed Description

The following non-limiting examples will allow one of ordinary skill in the art to more fully understand the present invention, but are not intended to limit the invention in any way.

Example 1

The use and maintenance of the self-priming pump will be further described with reference to FIG. 1 and the specific embodiment.

The device for solving the technical problem is provided with an underground tank 1 for storing low-temperature methanol, a pipeline arranged at the bottom of the underground tank 1 is connected with one side of a valve a3, the other side of the valve a3 is connected with one side of a filter 6, the other side of the filter 6 is connected with one side of a self-sucking pump 2, the other side of the self-sucking pump 2 is connected with one side of a valve b4, and the other side of the valve b4 is connected with an external feeding port. The bottom side of the self-primer pump 2 is connected to valve c 5. The valve c5 is higher than the underground tank 1, and the valve a3, the filter 6, the self-priming pump 2 and the valve b4 are at the same horizontal position and are all higher than the valve c 5.

The self-priming pump is a Liaoning Grarett Pump industry Co., Ltd: SBTZL-GZ/GZ0/GE/GE0 series horizontal self-priming pumps.

Example 2

The use method of the device comprises the following steps:

(1) preparation work before starting: checking whether each component is normal comprises: checking whether the self-priming pump can work normally, checking whether an instrument, a valve and the instrument can work normally, and checking whether the motor steering strives for; checking whether the connection is normal includes: checking whether the connection of the bolt, the pipeline and the lead is fastened or not;

Example 3

The use and maintenance of the self-priming pump will be further described below.

1. Use of a pump

Preparation before starting:

if the ambient temperature is lower than 0 ℃, a heat tracing medium is introduced by opening a heat tracing pipeline valve (the heat tracing pipeline can be set according to needs and belongs to the conventional means in the field). The shaft coupling on the self-priming pump is rotated by hand, the feeling is easy, the weight is uniform, whether noise such as friction sound and foreign matter rolling exists in the self-priming pump or not is noticed, and finally, the protective cover of the shaft coupling is installed well. Checking whether the connection of all the bolts, the pipelines and the leads is fastened; the level of oil in the oil reservoir of the self-priming pump should not be too high or too low. And checking whether all the instruments, valves and instruments are normal. Checking whether the motor turns correctly, and strictly prohibiting reverse rotation.

Starting: valve b4 and valve c5 were closed, and valve a3 was opened.

When the power supply is turned on, the self-priming pump 2 starts to work first (the self-priming time is different according to the length, the caliber and the self-priming height of the suction pipeline). After self-priming is completed, the self-priming pump 2 stops and the main motor runs, and the pointer of the pressure gauge at the outlet of the pump points to a corresponding closing point for reading. The valve b4 is slowly opened to adjust the flow rate, so that the self-priming pump 2 can normally work under the specified parameters. When the self-sucking pump 2 is emptied or the pipeline is blocked by impurities, the control system can immediately cut off the power supply, the unit stops working, and the failure of mechanical seal dry grinding and the dry running of equipment are avoided. When in work, the maximum bearing temperature is not more than 70 ℃, and the bearing temperature is not more than 40 ℃ of the ambient temperature. The change of the oil level of the oil storage chamber of the bearing support is noticed and controlled within a specified range. In order to keep the oil clean and well lubricated, when abnormal sound or other faults are found in the running process, the machine should be immediately stopped for checking, and the running can be continued after the faults are eliminated.

2. Pump servicing

When self priming pump 2 need overhaul, close valve a3, valve b4, open valve c5 and carry out the flowing back to increase the blind plate in valve a3, valve b4 department and keep apart, accomplish the safety inspection, and self priming pump 2 installs at underground tank periphery, and operating space is abundant.

The foregoing examples are provided for illustration and description of the invention only and are not intended to limit the invention to the scope of the described examples. Furthermore, it will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that many variations and modifications may be made in accordance with the teachings of the present invention, which variations and modifications are within the scope of the present invention as claimed.

Claims

1. The device for low-temperature methanol washing is characterized by comprising an underground tank (1), wherein a pipeline is arranged at the bottom of the underground tank (1) and is connected with one side of a valve a (3), the other side of the valve a (3) is connected with one side of a filter (6), the other side of the filter (6) is connected with one side of a self-sucking pump (2), the other side of the self-sucking pump (2) is connected with one side of a valve b (4), and the other side of the valve b (4) is connected with an external feeding port; the bottom side of the self-priming pump (2) is connected with a valve c (5); wherein the position of valve c (5) is higher than the position of underground tank (1), and valve a (3), filter (6), self priming pump (2), valve b (4) are in same horizontal position and all are higher than the position of valve c (6).

2. The device according to claim 1, wherein the valves a (3), b (4) and c (5) are all self-regulating valves.

3. The device according to claim 1, characterized in that a pressure gauge is also provided between the self-priming pump (2) and the valve b (4).

4. The apparatus of claim 1, wherein the temperature of the bearings in the self-primer pump (2) is no greater than 70 ℃ and the temperature of the bearings in the self-primer pump (2) is no greater than 40 ℃ ambient temperature.

5. Use of a device for low temperature methanol washing according to any of claims 1-4, characterized by the following steps:

(2) closing a valve b (4) and a valve c (5), opening a valve a (3), opening the valve b (4) when liquid in the underground tank (1) enters the self-sucking pump (2), and then opening the self-sucking pump (2) to enable the device to work;

(3) and (3) overhauling: close valve a (3) and valve b (4), open valve c (5) and carry out the flowing back, place the blind plate in valve a (3) and valve b (4) department, can carry out the maintenance of self priming pump (2).

6. The use method according to claim 5, wherein the checking whether each component is normal in the step (1) comprises: checking whether the self-priming pump can work normally, checking whether an instrument, a valve and the instrument can work normally, and checking whether the motor steering strives for; checking whether the connection is normal includes: and checking whether the connection of the bolt, the pipeline and the lead is tight or not.