CN116025832A - Water supplementing device and water supplementing method for wet type gas holder - Google Patents

Abstract

The invention relates to a water replenishing device and a water replenishing method of a wet type gas holder, wherein the wet type gas holder is provided with a bell jar which is sunk into a water sealing groove, water in the water sealing groove seals the bell jar, and an overflow port and a water replenishing channel are arranged on the water sealing groove and are used for maintaining the liquid level of the water sealing groove; the water replenishing device comprises a water replenishing regulating valve, a circulating tank, a circulating pump and a control system, wherein the water replenishing regulating valve is used for controlling the opening and closing of a water replenishing channel, water overflowed from a water sealing tank is stored in the circulating tank, the circulating pump pumps water in the circulating tank, such as the water sealing tank, and the control system controls the opening and closing of the water replenishing regulating valve and the circulating pump; the control system comprises a water seal tank liquid level detection module, a circulating pump control module and a water supplementing regulating valve control module, and is used for opening the water supplementing regulating valve in a normally closed state when the liquid level of the water seal tank is reduced to be higher than a first threshold u or the liquid level of the circulating tank is reduced to be higher than a second threshold v.

Description

Water supplementing device and water supplementing method for wet type gas holder

Technical Field

The invention relates to liquid level control of a water seal tank in a wet gas holder, in particular to a water supplementing device and a water supplementing method of the wet gas holder.

Background

The low-pressure gas holder is a container with variable capacity for storing gas, is commonly used in the chemical industry, and can be divided into a wet gas holder and a dry gas holder. The wet type gas holder is used for temporarily storing the chloroethylene gas in the chlor-alkali industry, which is a key pivot step for connecting a synthesis process and a rectification process, has great effect and cannot be replaced.

The wet gas holder is provided with a bell jar with adjustable height and a water seal tank. The opening at the lower end of the bell jar is immersed in the water sealing groove, the opening of the bell jar is sealed by water in the water sealing groove, and the cavity inside the bell jar is an accommodating space for storing vinyl chloride gas. The capacity of the accommodation space depends on the height of the bell (in actual production, referred to as "bin"), the gas storage bell rises, the accommodation space increases, the gas discharge bell falls, and Zhong Zhaoshang rises or falls depending on the amount of gas stored.

Liquid level the liquid level is in the gas holder driving period, from outside to continuously supply water to the water seal tank, and the water seal tank is made to produce overflow, so that the liquid level of the water seal tank is kept at the height of the overflow port. The water replenishing method has the problems of large water demand and poor economy, a certain amount of gas (such as flammable and toxic chloroethylene) stored in the gas holder is dissolved in the water overflowed from the water sealing tank, and the overflowed water can be discharged or recycled through complex treatment, so that the treatment cost is high.

If the liquid level in the water seal tank is measured by the liquid level meter, when the liquid level of the water seal tank is lower than the overflow port due to the rising of the bell jar or the evaporation of water, water is supplemented to the water seal tank, and although the using amount of water can be reduced, the problem of the discharge of the overflow water still cannot be solved.

Disclosure of Invention

The invention aims at solving the problems that in the prior art, the water supplementing amount required for maintaining the liquid level of a water seal tank is large, the economical efficiency is poor, the overflow water can be discharged or recycled after complicated treatment, and the treatment cost is high.

In order to achieve the above object, the present invention provides a water replenishing device for a wet gas holder, the wet gas holder having a bell 10 with an opening at a lower end and a water seal tank 11, a lower opening 101 of the bell 10 being immersed in the water seal tank 11, the bell 10 being sealed by water in the water seal tank 11, a cavity inside the bell 10 being a gas containing space 102, a gas storage passage 103 and a gas supply passage 104 being a gas inlet passage and a gas outlet passage, respectively, communicating with the containing space 102 through bottoms.

The water seal tank 11 is communicated with the water supplementing channel 2, and water is supplemented into the water seal tank 11 through the water supplementing channel 2 so as to maintain the liquid level height in the water seal tank 11, and excessive water overflows from an overflow port 13 formed on the water seal tank 11.

The water replenishing device comprises a water replenishing regulating valve 21, a circulating tank 3, a circulating pump 4 and a control system 5, wherein the water replenishing regulating valve 21 is arranged in the water replenishing channel 2 and used for controlling the opening and closing of the water replenishing channel 2.

The circulation tank 3 is communicated with the overflow port 13 of the water seal tank 11 through the overflow pipe 61, and water overflowed from the overflow port 13 flows into the circulation tank 3 through the overflow pipe 61. The water replenishing passage 2 is provided with a branch pipe downstream of the water replenishing regulating valve 21, and the branch pipe is communicated with the inside of the circulation tank 3 as a circulation pipe 62, and the circulation pump 4 is provided in the circulation pipe 62 for pumping water in the circulation tank 3 into the water seal tank 11 to circulate.

The circulating tank 3 collects water overflowed from the water seal tank 11, and the circulating pump 4 pumps the water back to the water seal tank 11 to form internal circulation, so that the water is not discharged outwards, the water supplementing amount is less, the economical efficiency is good, the water draining is not required to be treated again, and the environmental pollution is not caused.

When the bell jar 10 is at the highest position, the liquid level in the circulation tank 3 is set to a liquid level a.

The control system 5 comprises a water seal tank liquid level detection module 51, a circulating tank liquid level detection module 52, a circulating pump control module 53 and a water supplementing regulating valve control module 54.

The circulation pump control module 53 controls the circulation pump 4 so that the circulation pump 4 continuously pumps the water in the circulation tank 3 into the water seal tank 11.

The water seal tank liquid level detection module 51 calculates the difference between the water seal tank liquid level B of the water seal tank 11 and the overflow port liquid level B according to the detection value of the water seal tank liquid level meter 12, the difference is used as a water seal tank liquid level descending value U, whether the water seal tank liquid level descending value U is larger than a first threshold value U is judged, and when the water seal tank liquid level descending value U is larger than the first threshold value U, a water supplementing signal is output and an alarm is sent.

The circulation tank liquid level detection module 52 calculates a difference between the circulation tank liquid level a of the circulation tank 3 and the set liquid level a of the circulation tank according to the detection value of the circulation tank liquid level meter 31, the difference is used as a circulation tank liquid level drop value V, whether the circulation tank liquid level drop value V is greater than a second threshold value V is judged, and when the circulation tank liquid level drop value V is greater than the second threshold value V, a water supplementing signal is output.

When the water replenishing regulating valve 21 is in a normally closed state and the water replenishing regulating valve control module 54 receives the water replenishing signal output by either the water seal tank liquid level detection module 51 or the circulating tank liquid level detection module 52, the water replenishing regulating valve 21 is started to replenish water to the water seal tank 11 until the water seal tank liquid level B of the water seal tank 11 is equal to the overflow port liquid level B or the circulating tank liquid level A of the circulating tank 3 is equal to the set liquid level a, and the water replenishing regulating valve 21 is closed.

Therefore, in the case that the circulation pipe 62 cannot convey water to the water seal tank (such as the damage and power failure of the circulation pump 4 and the backup pump 41, or the blockage and freezing of the pipe), when the liquid level of the water seal tank 11 drops to the first threshold u due to evaporation and other reasons, the water supply adjusting valve 21 is opened and an alarm is given, so that the water supply in the water seal tank 11 is ensured to be uninterrupted, the liquid level in the water seal tank 11 is maintained, and the staff is informed to check and repair the water device in time, thereby avoiding the risk of vinyl chloride leakage.

In addition, in the running process of the water replenishing device, the total amount of water circulating between the water sealing tank and the circulating tank is reduced due to the water evaporation and the like in the water sealing tank and the circulating tank, and the circulating pump continuously pumps water into the circulating tank, so that the water level in the water sealing tank 11 can be maintained at the overflow port liquid level b, and only the liquid level of the circulating tank 3 is reduced; when the liquid level reduction amount of the circulation tank 3 reaches the second threshold v, the water replenishing regulating valve 21 in the water replenishing channel 2 is opened to replenish water into the water sealing tank 11, and the water quantity of internal circulation is replenished, so that the water sealing liquid level deficiency caused by the insufficient water quantity in the circulation tank 3 can be avoided, the circulation pump pumping out caused by the excessively low liquid level in the circulation tank 3 is avoided, and the liquid level in the water sealing tank 11 can be ensured to be in a high liquid level state at all times.

Preferably, the circulation pump control module 53 turns off the circulation pump 4 during the period when the circulation tank level detection module 52 outputs the water replenishment signal.

Because the liquid level in the circulation tank is lower when the water replenishing is started, the circulation pump 4 is closed at the moment, the circulation pump 4 can be prevented from being pumped out, and the circulation pump 4 cannot be damaged due to the fact that the liquid level in the circulation tank is too low.

Preferably, the first threshold u is set at 90% of the overflow port level b and the second threshold v is set at 5% to 30% of the circulation tank set level a.

Therefore, the liquid level of the water seal tank can be maintained to be more than 90%, water seal failure is avoided, and water with more than 70% -95% of the set liquid level a stored in the circulating tank can be used for supplementing water to the water seal tank 11, namely uninterrupted water supplementing can be ensured.

Preferably, a standby pump 41 is provided for the circulating pump 4, the water inlet pipe and the water outlet pipe of the standby pump 41 are connected in parallel with the circulating pump 4, and when the circulating pump 4 is detected to be faulty, the circulating pump control module 53 switches the circulating pump 4 to the standby pump 41, and the standby pump 41 continuously pumps the water in the circulating tank 3 into the water seal tank 11.

Therefore, the phenomenon that the circulating tank 3 is not filled with water in time or the circulating tank is full of water overflows due to the fault of the circulating pump can be avoided.

Preferably, the circulation pump control module 53 determines that the circulation pump 4 is malfunctioning according to the liquid level change track in the circulation tank 3 and the movement track of the bell jar 10.

For example, the circulation pump control module 53 determines that the circulation pump 4 has failed by detecting a rapid rise in the liquid level in the circulation tank 3, and opens the water replenishment regulating valve in time after determining that the circulation pump 4 has failed. Therefore, the phenomenon that the circulating tank 3 is not filled with water in time or the circulating tank is full of water overflows due to the fault of the circulating pump can be avoided. And the judgment of the faults can be recorded, so that the maintenance of the staff is facilitated.

For the same inventive concept, the invention provides a water supplementing method of a wet gas cabinet, which comprises the following steps:

by the execution of the water replenishing device, the water replenishing device comprises:

the water replenishing device comprises a water replenishing regulating valve 21, a circulating tank 3, a circulating pump 4 and a control system 5, wherein the water replenishing regulating valve 21 is arranged in the water replenishing channel 2 and used for controlling the opening and closing of the water replenishing channel 2.

The circulation tank 3 is communicated with the overflow port 13 of the water seal tank 11 through the overflow pipe 61, and water overflowed from the overflow port 13 flows into the circulation tank 3 through the overflow pipe 61.

The water replenishing passage 2 is provided with a branch pipe downstream of the water replenishing regulating valve 21, and the branch pipe is communicated with the inside of the circulation tank 3 as a circulation pipe 62, and the circulation pump 4 is provided in the circulation pipe 62 for pumping water in the circulation tank 3 into the water seal tank 11 to circulate.

The circulating tank 3 collects water overflowed from the water seal tank 11, and the circulating pump 4 pumps the water back to the water seal tank 11 to form internal circulation, so that the water is not discharged outwards, the water supplementing amount is less, the economical efficiency is good, the water draining is not required to be treated again, and the environmental pollution is not caused.

The circulation tank 3 stores a certain amount of water, and when the bell jar 10 is at the highest position, the liquid level in the circulation tank 3 is set to a liquid level a.

. The control system 5 comprises a water seal tank liquid level detection module 51, a circulating tank liquid level detection module 52, a circulating pump control module 53 and a water supplementing regulating valve control module 54.

The method comprises the following steps:

in the overflow water circulation step S110, the circulation pump control module 53 controls the circulation pump 4, so that the circulation pump 4 continuously pumps the water in the circulation tank 3 into the water seal tank 11.

In the water seal tank liquid level drop judging steps S120 and S130, the water seal tank liquid level detecting module 51 calculates a difference between the liquid level B of the water seal tank 11 and the overflow port liquid level B according to the detection value of the water seal tank liquid level meter 12, and the difference is used as a water seal tank liquid level drop value U to judge whether the water seal tank liquid level drop value U is greater than a first threshold U or not, and when the water seal tank liquid level drop value U is greater than the first threshold U, a water supplementing signal is output and an alarm is sent.

Therefore, in the case that the circulation pipe 62 cannot convey water to the water seal tank (such as the damage and the power failure of the circulation pump 4 and the backup pump 41, or the blockage and the freezing of the pipe), when the liquid level of the water seal tank 11 drops to the first threshold u due to evaporation and other reasons, the water supply adjusting valve 21 is opened and an alarm is given, so that the water supply in the water seal tank 11 is ensured to be uninterrupted, the liquid level in the water seal tank 11 is maintained, and the staff is informed to check the water repairing device in time, thereby avoiding the risk of vinyl chloride leakage. And in the circulating tank liquid level drop judging steps S140 and S150, the circulating tank liquid level detecting module 52 calculates a difference between the liquid level a of the circulating tank 3 and the set liquid level a of the circulating tank according to the measured value of the circulating tank liquid level meter 31, and the difference is used as a circulating tank liquid level drop value V to judge whether the circulating tank liquid level drop value V is greater than a second threshold value V or not, and when the circulating tank liquid level drop value V is greater than the second threshold value V, a water supplementing signal is output.

Therefore, in the running process of the water replenishing device, when the liquid level reduction amount of the circulation tank 3 reaches the second threshold v due to evaporation and other reasons, the water replenishing regulating valve 21 in the water replenishing channel 2 is opened to replenish water into the water sealing tank 11 to replenish water in the internal circulation, so that the water sealing liquid level deficiency caused by the insufficient water in the circulation tank 3 can be avoided, the circulation pump pumping out caused by the excessively low liquid level in the circulation tank 3 is avoided, and the liquid level in the water sealing tank 11 can be ensured to be in a high liquid level state all the time.

And in the water replenishing step S170, the water replenishing regulating valve 21 is in a closed state at ordinary times, when the water replenishing regulating valve control module 54 receives a water replenishing signal output by either the water seal tank liquid level detection module 51 or the circulating tank liquid level detection module 52, the water replenishing regulating valve 21 is started to replenish water to the water seal tank 11 until the liquid level B of the water seal tank 11 is equal to the overflow port liquid level B or the water replenishing regulating valve 21 is closed when the liquid level A of the circulating tank 3 is equal to the set liquid level a.

Preferably, the method further comprises a circulating pump closing step S160, wherein the circulating pump control module 53 closes the circulating pump 4 during the period when the circulating tank liquid level detection module 52 outputs the water replenishing signal.

Because the liquid level in the circulation tank is lower when the water replenishing is started, the circulation pump 4 is closed at the moment, the circulation pump 4 can be prevented from being pumped out, and the circulation pump 4 cannot be damaged due to the fact that the liquid level in the circulation tank is too low.

Preferably, the first threshold u is set at 90% of the overflow port level b and the second threshold v is set at 5% to 30% of the circulation tank set level a.

Therefore, the liquid level of the water seal tank can be maintained to be more than 90%, water seal failure is avoided, and water with more than 70% -95% of the set liquid level a stored in the circulating tank can be used for supplementing water to the water seal tank 11, namely uninterrupted water supplementing can be ensured.

Preferably, a backup pump 41 is provided for the circulation pump 4, and a water inlet pipe and a water outlet pipe of the backup pump 41 are connected in parallel with the circulation pump 4.

The method further comprises a circulating pump switching step 200, wherein when the circulating pump control module 53 detects the fault of the circulating pump 4, the circulating pump 4 is switched to the standby pump 41, and the standby pump 41 continuously pumps the water in the circulating tank 3 into the water seal tank 11.

Therefore, the phenomenon that the circulating tank 3 is not filled with water in time or the circulating tank is full of water overflows due to the fault of the circulating pump can be avoided.

Preferably, in the circulation pump switching step 200, the circulation pump 4 is judged to be out of order when the liquid level change locus and the movement locus of the bell jar 10 do not coincide with each other, based on the liquid level change locus in the circulation tank 3 and the movement locus of the bell jar 10.

Therefore, the control system can open the water supplementing regulating valve more timely, and the phenomenon that water supplementing of the circulating tank 3 is not timely or the circulating tank is full of water overflows due to the fault of the circulating pump is avoided. And the judgment of the faults can be recorded, so that the maintenance of the staff is facilitated.

Drawings

FIG. 1 is an explanatory diagram of the working principle of a vinyl chloride gas holder apparatus (wet gas holder);

FIG. 2 is an explanatory diagram of the construction of the water replenishing device of the vinyl chloride gas cabinet;

FIG. 3 is an explanatory diagram of a control system in the water replenishing device;

FIG. 4 is a flow chart illustrating water replenishment;

fig. 5 is an explanatory view of liquid level changes of the water seal tank and the circulation tank during water replenishment.

Detailed Description

The preferred embodiments of the present invention will be described in detail below with reference to the attached drawings, wherein reference numerals refer to components and techniques of the present invention so that the advantages and features of the present invention can be more easily understood in the proper environment. The following description is a specific embodiment of the present invention.

Hereinafter, a water replenishing device of a wet type gas holder will be described by taking a vinyl chloride gas holder device for storing a vinyl chloride gas in a vinyl chloride production process as an example.

Fig. 1 is an explanatory diagram of the principle of a vinyl chloride gas cabinet apparatus.

The vinyl chloride gas holder device is composed of a wet single gas holder, and mainly comprises a movable tower section (bell jar) 10, a water seal tank 11, a gas storage channel 103, a gas supply channel 104, an auxiliary water supplementing channel 2 and the like, and has the functions of storage, buffering, pressure stabilization, mixing and the like, and is used for balancing the non-uniformity of the gas demand of the vinyl chloride, the non-uniformity of the gas components, the adjustment of the production load, emergency stopping, the recovery of vinyl chloride materials, the recovery of materials during the maintenance of local equipment, the emergency recovery of materials under specific conditions and the like. Taking a single gas holder as an example, fig. 1A shows a state in which the bell jar 10 is at the lowest position, and fig. 1B shows a state in which the bell jar of the wet gas holder is at the highest position.

As shown in fig. 1A and 1B, the lower end opening 101 of the bell jar 10 is immersed in a water seal tank, and the bell jar 10 is sealed by water in the water seal tank 11. The cavity inside the bell 10 serves as a gas containing space 102..

The working principle is that the gas storage channel 103 and the gas supply channel 104 pass through the bottom plate of the water seal tank or the lower part of the outer wall of the gas holder and the water in the water tank to enter the bell jar 10, so as to realize the input or discharge of gas. When the gas is pumped into the accommodating space 102, the bell jar 10 is lifted up to the position shown in fig. 1B, the liquid level of the lower end opening 101 of the bell jar is the highest liquid level q, and the liquid level of the water seal groove 11 must be kept high to seal the bell jar opening 101. At the output gas, the bell 10 descends, at the lowest to the position shown in fig. 1A, the lower end opening 101 of the bell being at the lowest level p. A drain line 14 is arranged at the bottom of the water seal tank 11 and is used for draining the water of the water seal tank when the gas holder fails so as to be convenient for overhauling.

The overflow port 13 is arranged on the water seal tank 11, the position of the overflow port 13 is higher than the highest height of the opening 101 of the bell jar 10, and the redundant water in the water seal tank 11 overflows from the overflow port 13. The water in the water seal tank is lost, for example, the liquid level in the water seal tank can fluctuate due to the pressure change of the water surface, and a part of water can flow out from the overflow port 13; or the water seal tank is arranged in the open air environment, and the water in the water seal tank can be reduced due to evaporation. The water seal tank has the advantages that the water seal failure and the leakage of chloroethylene can be caused by the too low liquid level in the water seal tank, and timely water supplementing is needed.

As shown in fig. 1A and 1B, the water seal tank 11 is provided with a water replenishing channel 2 for replenishing water into the water seal tank 11. The water is continuously replenished into the water seal tank 11 through the water replenishing channel 2, and redundant water in the water seal tank 11 flows out from the overflow port 13, so that the liquid level in the water seal tank 11 can be maintained at the position of the overflow port 13, and the phenomenon that the liquid level in the water seal tank is too low and the water seal fails can be avoided.

The water replenishing device is arranged on the basis of the water replenishing channel 2 and the overflow port 13. Fig. 2 is an explanatory view of a water replenishing device of a vinyl chloride gas cabinet, fig. 3 is an explanatory view of a control system in the water replenishing device, and the entire water replenishing device of the vinyl chloride gas cabinet will be described below with reference to fig. 1 to 3.

As shown in fig. 2, the water replenishing device includes a water seal tank level gauge 12, a water replenishing regulating valve 21, a circulation tank 3, a circulation tank level gauge 31, a circulation pump 4, a backup pump 41, and a control system 5.

The water seal tank liquid level meter 12 is arranged for the water seal tank 11 and is used for detecting the liquid level of water in the water seal tank. According to the measured value of the water seal tank liquid level meter 12, the liquid level value of the overflow port of the water seal tank 11 is set as a water seal tank liquid level b, and the function of the water seal tank liquid level b is detailed in the description part of the control system 5.

A water replenishment regulating valve 21 is provided in the water replenishment passage 2 for controlling opening and closing of the water replenishment passage 2.

The circulation tank 3 is a tank capable of storing water, and as shown in fig. 1 and 2, the circulation tank 3 is communicated with the overflow port 13 of the water seal tank 11 through the overflow pipe 61, and overflow water overflowed from the overflow port 13 flows into the circulation tank 3 through the overflow pipe 61. The volume ratio of the circulating tank 3 to the water seal tank 11 is set to be 1:250, namely, the circulating tank 3 is small in volume, so that site selection and construction in a factory are facilitated, and the practicality is high.

A circulation tank level gauge 31 is provided for the circulation tank 3 for measuring the level of water in the circulation tank 3. The detected value of the circulation tank level gauge 31 when the bell jar 10 is raised to the highest position (i.e., the position shown in fig. 1B) is referred to as a set level a, and the function of the set level a will be described in detail in the following description of the control system 5.

The circulation pipe 62 communicates with the circulation tank 3 and the water replenishing channel of the water seal tank 11, and as shown in fig. 2, the circulation pipe 62 is connected to the water replenishing pipe 2 (downstream of the water replenishing regulating valve 21) through a three-way pipe, and the circulation pump 4 is disposed on the circulation pipe 62 for pumping water in the circulation pump 3 into the water seal tank 11.

The water overflowed from the water seal tank 11 is stored through the circulating tank 31, and the water pump stored in the circulating tank 31 is returned to the water seal tank 11 through the circulating pump 4, so that continuous water replenishing in the water seal tank 11 can be ensured, the generated overflowed water is not discharged outwards, the water overflowed from the water seal tank is not required to be treated, the gas dissolved in the water is separated, and the cost of water treatment is omitted.

The backup pump 41 is connected in parallel with the circulation pump 4 on the circulation pipe 62. When the circulating pump 4 fails, the standby pump 41 replaces the circulating pump 4 to pump water in the circulating pump 3, such as the water seal tank 11, so that the phenomenon that the circulating tank 3 is not filled with water timely or the circulating tank is full of water and overflows due to the failure of the circulating pump can be avoided. A check valve is provided downstream of the circulation pump 4 and the backup pump 41 to prevent the circulation pump 4 or the backup pump 41 in the inactive state from being affected by the water flow.

The control system 5 is capable of interacting with the water seal tank level gauge 13, the water replenishment regulating valve 21, the circulation tank level gauge 31, the circulation pump 4 and the backup pump 41, and the control system 5 controls the opening and closing of the water replenishment regulating valve 21, the circulation pump 4 and the backup pump 41.

Fig. 5 is an explanatory view of liquid level changes of the water seal tank and the circulation tank during water replenishment. The control system is described in detail below in conjunction with fig. 3 and 5.

As shown in fig. 3, the control system 5 includes a water seal tank liquid level detection module 51, a circulation tank liquid level detection module 52, a circulation pump control module 53, and a water replenishment regulating valve control module 54. As shown in fig. 3 and 5, the water seal tank liquid level detection module 51 obtains the detection value of the water seal tank liquid level meter 12 as the water seal tank liquid level B, obtains the overflow port liquid level B mentioned in the foregoing description of the portion of the water seal tank liquid level meter 12, sets the first threshold U according to 90% of the overflow port liquid level B (the liquid level B' in fig. 5 is 90% of the overflow port liquid level B), calculates the difference between the water seal tank liquid level B and the overflow port liquid level B, and uses the difference as the water seal tank liquid level drop value U. Judging whether the liquid level drop value U of the water seal tank is larger than a first threshold value U, and outputting a water supplementing signal to the water supplementing regulating valve control module 54 at the moment when the liquid level drop value U of the water seal tank is larger than the first threshold value U, wherein the regulating valve control module 54 opens the water supplementing regulating valve 21 which is closed at ordinary times according to the water supplementing signal.

An alarm is arranged in the water seal tank liquid level detection module 51, and an alarm is sent out when the water seal tank liquid level drop value U is detected to be larger than a first threshold value.

The circulation tank level detection module 52 acquires the measured value from the circulation tank level gauge 31 as the circulation tank level a, acquires the set level a mentioned in the foregoing description of the part of the circulation tank level gauge 31, sets the second threshold V according to 5% to 30% of the set level a of the circulation tank (the level a' in fig. 5 is 30% of the set level a), and calculates the difference between the circulation tank level a and the set level a of the circulation tank as the circulation tank level drop value V. And judging whether the liquid level drop value V of the circulating tank is larger than a second threshold value V, and outputting a water supplementing signal to the water supplementing regulating valve control module 54 when the liquid level drop value V of the circulating tank is larger than the second threshold value V, wherein the regulating valve control module 54 opens the water supplementing regulating valve 21 which is closed at ordinary times according to the water supplementing signal. The circulation pump control module 53 controls the circulation pump 4 so that the circulation pump 4 continuously pumps the water in the circulation tank 3 into the water seal tank 11.

Therefore, the water replenishment regulating valve 21 is normally closed, and when the water replenishment regulating valve control module 54 receives the water replenishment signal output from either the water seal tank liquid level detection module 51 or the circulation tank liquid level detection module 52, the water replenishment regulating valve 21 is started to replenish water to the water seal tank 11 until the liquid level B of the water seal tank 11 is equal to the overflow port liquid level B or the water level a of the circulation tank 3 is equal to the set liquid level a, the water replenishment regulating valve 21 is closed. In fig. 5, the water seal tank liquid level drop value U is greater than the first threshold value U, the circulation tank liquid level drop value V is less than the second threshold value V, and one of the conditions for opening the water replenishment regulating valve is satisfied, so that the water replenishment regulating valve 21 is opened and the control device 5 gives an alarm.

The principle of the control system 5 is as follows:

when the liquid level in the water seal tank 11 is above a first threshold u and the liquid level in the circulating tank 3 is above a second threshold v, the circulating pump 4 is started to continuously pump water in the circulating tank 3 into the water seal tank 11, so that water is continuously replenished for the circulating tank 3, the liquid level in the water seal tank 11 is effectively maintained, and gas leakage caused by insufficient water seal liquid level is avoided. The overflow water of the water seal tank 11 continuously flows back to the circulation tank from the overflow port of the water seal tank 11, and the water is not discharged outwards in the process, so that pollution and waste are not caused.

In the operation process of the water replenishing device, because the structures of the second pipeline 62, the circulating pump 4 and the standby pump 41 are complex, the operation of the circulating pump 4 and the standby pump 41 depends on the motor, when the pipeline is blocked and power failure occurs, water in the circulating tank 3 cannot be pumped into the sealing groove 11 or the pumped water flow is too small, and the liquid level of the water sealing tank can be lowered. When the water seal tank liquid level detection module 51 judges that the water seal tank liquid level drop value U is larger than the first threshold value U, the water replenishing regulating valve 21 is opened and an alarm is given, so that water replenishing in the water seal tank 11 can be ensured to be uninterrupted, the liquid level height in the water seal tank 11 is maintained, and workers are informed of checking and repairing the water device in time, and the danger of vinyl chloride leakage is avoided.

In addition, during the operation of the water replenishing device, the amount of water circulating between the circulating tank 3 and the water seal tank 11 is continuously reduced due to evaporation and the like, while the water seal tank 11 is usually continuously replenished with water, and the liquid level of the water seal tank 11 is maintained at the overflow port liquid level b, so that the liquid level of the circulating tank 3 is only slowly reduced. When the circulation tank liquid level detection module 52 judges that the circulation tank liquid level is reduced to the second threshold v, the water replenishing regulating valve 21 in the water replenishing channel 2 is opened to replenish water into the water seal tank 11, namely replenishing the circulating water amount, namely guaranteeing that the liquid level in the water seal tank 11 is in a high liquid level state at all times, avoiding the water seal liquid level shortage caused by insufficient water amount in the circulation tank 3, and avoiding the evacuation and damage of the circulation pump caused by over-low liquid level in the circulation tank 3. In actual production, the set liquid level a is more than 15% of the volume of the circulating tank, namely, the liquid level in the circulating tank 3 can be ensured not to be lower than a certain amount, and the circulating pump 4 (the standby pump 41) is prevented from being evacuated.

In the above-described process, the circulation pump control module 53 determines whether the circulation pump 4 is malfunctioning according to the liquid level change locus in the circulation tank 3 and the movement locus of the bell jar 10, and switches off the circulation pump 4 when the determination result is that the circulation pump 4 is malfunctioning, and switches the backup pump 41 to operate in place of the circulation pump 4. For example, the circulation pump control module 53 finds that the liquid level in the circulation tank 3 is rapidly rising, and can determine that the circulation pump 4 is malfunctioning, and after determining that the circulation pump 4 is malfunctioning, the water replenishment regulating valve is timely opened, so that it is possible to avoid that water replenishment is not timely or the circulation tank is full of water due to the malfunction of the circulation pump. During the period when the circulation tank level detection module 52 outputs the water replenishment signal, the circulation pump control module 53 turns off the circulation pump 4. Therefore, the circulation pump 4 can be prevented from being evacuated, and the circulation pump 4 is not damaged due to the fact that the liquid level in the circulation tank is too low.

In short, only when the water in the internal circulation is insufficient, water is supplied to the water seal tank 11 from the outside, so that the water demand is reduced. And the overflow water overflowed from the water seal tank 11 is completely returned to the water seal tank 11 without being discharged outwards, and the cost of treating the water is also omitted. And, control system 5 is used to control the water replenishing regulating valve 21 to open under the conditions that the pump fails and the circulating pipeline 62 cannot replenish water, so that the high liquid level of the water seal tank 11 can be ensured, and the safety and reliability are ensured.

Fig. 4 is a flow chart illustrating a water replenishing method.

Taking the example of the water replenishing device of the first embodiment, the vinyl chloride wet gas holder is replenished with water by the following steps, as shown in fig. 4, including:

in the overflow water circulation step S110, the circulation pump control module 53 controls the circulation pump 4 to make the circulation pump 4 continuously pump the water in the circulation tank 3 into the water seal tank 11,

in the water seal tank liquid level drop judging steps S120 and S130, the water seal tank liquid level detecting module 51 calculates a difference between the liquid level B of the water seal tank 11 and the overflow port liquid level B according to the detection value of the water seal tank liquid level meter 12, and the difference is used as a water seal tank liquid level drop value U to judge whether the water seal tank liquid level drop value U is greater than a first threshold U or not, and when the water seal tank liquid level drop value U is greater than the first threshold U, a water supplementing signal is output.

And in the circulating tank liquid level drop judging steps S140 and S150, the circulating tank liquid level detecting module 52 calculates a difference between the liquid level a of the circulating tank 3 and the set liquid level a of the circulating tank according to the measured value of the circulating tank liquid level meter 31, and the difference is used as a circulating tank liquid level drop value V to judge whether the circulating tank liquid level drop value V is greater than a second threshold value V or not, and when the circulating tank liquid level drop value V is greater than the second threshold value V, a water supplementing signal is output.

The circulation pump is turned off step S160, and the circulation pump control module 53 turns off the circulation pump 4 during the period when the circulation tank level detection module 52 outputs the water replenishment signal.

And in the water replenishing step S170, the water replenishing regulating valve 21 is in a closed state at ordinary times, when the water replenishing regulating valve control module 54 receives a water replenishing signal output by either the water seal tank liquid level detection module 51 or the circulating tank liquid level detection module 52, the water replenishing regulating valve 21 is started to replenish water to the water seal tank 11 until the liquid level B of the water seal tank 11 is equal to the overflow port liquid level B or the water replenishing regulating valve 21 is closed when the liquid level A of the circulating tank 3 is equal to the set liquid level a.

Therefore, when the liquid level in the water seal tank 11 is above the first threshold u and the liquid level in the circulating tank 3 is above the second threshold v, the circulating pump 4 is started, water in the circulating tank 3 is continuously pumped into the water seal tank 11 and continuously flows back to the circulating tank from the overflow port of the water seal tank 11, so that the liquid level in the water seal tank 11 is effectively maintained, and gas leakage caused by insufficient water seal liquid level is avoided.

When the liquid level of the water seal tank 11 and the circulating tank 3 is reduced due to water evaporation and the like, when the liquid level of the water seal tank is reduced to a first threshold u or the liquid level of the circulating tank is reduced to a second threshold v, the water supplementing regulating valve 21 in the water supplementing channel 2 is opened to supplement water into the water seal tank 11, so that the liquid level in the water seal tank 11 is ensured to be in a high liquid level state at all times, and the defect of insufficient water seal liquid level caused by insufficient water quantity in the circulating tank 3 and the damage of the circulating pump caused by over-low liquid level are avoided.

Because only when the water in the internal circulation is insufficient, water is supplemented to the water seal tank 11 from the outside, the water demand is reduced. And the overflow water overflowed from the water seal tank 11 is completely returned to the water seal tank 11 and is not discharged outwards, so that the water overflowed from the water seal tank is not required to be treated, the gas dissolved in the water is separated, and the cost of treating the water is omitted.

Because the liquid level in the circulation tank is lower when the water replenishing is started, the circulation pump 4 is closed at the moment, the circulation pump 4 can be prevented from being pumped out, and the circulation pump 4 cannot be damaged due to the fact that the liquid level in the circulation tank is too low.

The method further comprises a circulating pump switching step 200, wherein when the circulating pump control module 53 detects the fault of the circulating pump 4, the circulating pump 4 is switched to the standby pump 41, and the standby pump 41 continuously pumps the water in the circulating tank 3 into the water seal tank 11. Therefore, the water seal failure caused by untimely water supplementing due to the damage of the circulating pump 4 can be avoided.

Further, as shown in fig. 5, a minimum preset value b 'of the water seal tank liquid level is set according to the overflow port liquid level b, and the minimum preset value b' is the difference between the overflow port liquid level b and the first threshold u in example 1. And when the detection value B of the water seal tank liquid level meter is lower than the lowest preset value B' of the water seal tank liquid level, starting the water supplementing regulating valve.

Similarly, the circulation tank minimum preset value a 'is set according to the set liquid level a, and the circulation tank minimum preset value a' is the difference between the set liquid level b and the second threshold v in embodiment 1. When the detection value A of the circulating tank liquid level meter is lower than the lowest preset value a' of the circulating tank liquid level, the circulating pump or the standby pump is closed, and the water supplementing regulating valve is opened.

In short, as long as one of the above conditions is satisfied, the water replenishing regulating valve is opened, and accordingly, the water replenishing device and the water replenishing method of the wet type gas holder can be simplified in an instrument linkage manner.

Modification examples

In the multi-section wet type gas holder, overflow ports 13a … n of water seal grooves 11a … n between movable tower sections and water supplementing channels 2a … n.

The water replenishing device is provided with a corresponding water replenishing regulating valve 21a … n, an overflow channel 61a … n and a circulation channel 62a … n, wherein the overflow channel a … n is respectively connected with an overflow port 13a … n of a water seal groove 11a … n between the movable tower sections, and water in the water seal groove 11a … n is conveyed into the circulation groove 3. The circulation channels 62a … n are respectively provided with a circulation pump 4a … n and a backup pump 41a … n which are connected in parallel, and the water pump in the circulation tank 3 is returned to the seal tank 11a … n.

The control system 5 controls the opening and closing of the water replenishment regulating valve 21a … n, the circulation pump 4a … n, and the backup pump 41a … n in the manner described in example 1.

It should be noted that the above-mentioned embodiments and modifications illustrate rather than limit the invention, and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims.

For example, the values of the first threshold and the second threshold can be adjusted according to the actual conditions in production, or the measured values of the set liquid level a and the overflow liquid level b are updated when the vehicle is started and stopped, or the height of the overflow liquid level b higher than the actual overflow 13 is set, or a drainage channel can be further arranged at the bottom of the circulation tank, etc.

In addition, in the claims, any reference signs placed between parentheses shall not be construed as limiting the claim.

Claims (10)

1. The water replenishing device of the wet gas holder is provided with a bell jar (10) with an opening at the lower end and a water seal tank (11), the opening at the lower end (101) of the bell jar (10) is sunk into the water seal tank (11), the water in the water seal tank (11) seals the bell jar (10), a cavity in the bell jar (10) is used as a gas containing space (102), a gas storage channel (103) and a gas supply channel (104) are respectively used as a gas inlet channel and a gas outlet channel and are communicated with the containing space (102) through a sealing plate at the bottom,

the water seal tank (11) is communicated with the water supplementing channel (2), water is supplemented into the water seal tank (11) by the water supplementing channel (2) so as to maintain the liquid level height in the water seal tank (11), redundant water overflows from an overflow port (13) formed on the water seal tank (11),

it is characterized in that the water supplementing device comprises a water supplementing regulating valve (21), a circulating groove (3), a circulating pump (4) and a control system (5), the water supplementing regulating valve (21) is arranged in the water supplementing channel (2) and is used for controlling the opening and closing of the water supplementing channel (2),

the circulating tank (3) is communicated with an overflow port (13) of the water seal tank (11) through an overflow pipeline (61), water overflowed from the overflow port (13) flows into the circulating tank (3) through the overflow pipeline (61),

a branch pipe is arranged in the water supplementing channel (2) and positioned at the downstream of the water supplementing regulating valve (21), the branch pipe is used as a circulating pipeline (62) to be communicated with the inside of the circulating groove (3), the circulating pump (4) is arranged in the circulating pipeline (62) and is used for pumping water in the circulating groove (3) into the water sealing groove (11) for circulation,

when the bell jar (10) is at the highest position, the liquid level in the circulating tank (3) is set to be liquid level (a),

the control system (5) comprises a water seal tank liquid level detection module (51), a circulating tank liquid level detection module (52), a circulating pump control module (53) and a water supplementing regulating valve control module (54),

the circulating pump control module (53) controls the circulating pump (4) to enable the circulating pump (4) to continuously pump the water in the circulating tank (3) into the water seal tank (11),

the water seal tank liquid level detection module (51) calculates the difference value between the water seal tank liquid level (B) of the water seal tank (11) and the overflow port liquid level (B) according to the detection value of the water seal tank liquid level meter (12), the difference value is used as a water seal tank liquid level descending value U, whether the water seal tank liquid level descending value (U) is larger than a first threshold value (U) or not is judged, when the water seal tank liquid level descending value (U) is larger than the first threshold value (U), a water supplementing signal is output,

the circulating tank liquid level detection module (52) calculates the difference value between the circulating tank liquid level (A) of the circulating tank (3) and the set liquid level (a) of the circulating tank according to the detection value of the circulating tank liquid level meter (31), the difference value is used as a circulating tank liquid level descending value (V), whether the circulating tank liquid level descending value (V) is larger than a second threshold value (V) or not is judged, and when the circulating tank liquid level descending value (V) is larger than the second threshold value (V), a water supplementing signal is output,

the water replenishing regulating valve (21) is in a closed state at ordinary times, when the water replenishing regulating valve control module (54) receives any one of the water sealing tank liquid level detection module (51) or the circulating tank liquid level detection module (52) to output a water replenishing signal, the water replenishing regulating valve (21) is started to replenish water to the water sealing tank (11) until the water sealing tank liquid level (B) of the water sealing tank (11) is equal to the overflow port liquid level (B), or the circulating tank liquid level (A) of the circulating tank (3) is equal to the set liquid level (a), the water replenishing regulating valve (21) is closed.

2. The water replenishing device of a wet gas cabinet according to claim 1, wherein the circulation pump control module (53) turns off the circulation pump (4) during the period when the circulation tank liquid level detection module (52) outputs a water replenishing signal.

3. The water replenishing device of a wet gas cabinet according to claim 1, wherein the first threshold value (u) is set according to 90% of the overflow port liquid level (b), and the second threshold value (v) is set according to 5% -30% of the set liquid level (a) of the circulation tank.

4. A water replenishing device for a wet gas cabinet according to claim 1, 2 or 3, wherein a backup pump (41) is provided for the circulation pump (4),

the water inlet pipe and the water outlet pipe of the standby pump (41) are connected with the circulating pump (4) in parallel, the circulating pump control module (53) switches the circulating pump (4) to the standby pump (41) when detecting the fault of the circulating pump (4), and the standby pump (41) continuously pumps the water in the circulating tank (3) into the water seal tank (11).

5. The water replenishing device of a wet gas cabinet according to claim 4, wherein the circulating pump control module (53) judges that the circulating pump (4) is faulty according to a liquid level change track in the circulating tank (3) and a movement track of the bell jar (10).

6. A water replenishing method of a wet gas holder is characterized in that the water replenishing method is executed by a water replenishing device,

the water supplementing device comprises a water supplementing regulating valve (21), a circulating groove (3), a circulating pump (4) and a control system (5), wherein the water supplementing regulating valve (21) is arranged in the water supplementing channel (2) and is used for controlling the opening and closing of the water supplementing channel (2),

the circulating tank (3) is communicated with an overflow port (13) of the water seal tank (11) through an overflow pipeline (61), water overflowed from the overflow port (13) flows into the circulating tank (3) through the overflow pipeline (61),

a branch pipe is arranged in the water supplementing channel (2) and positioned at the downstream of the water supplementing regulating valve (21), the branch pipe is used as a circulating pipeline (62) to be communicated with the inside of the circulating groove (3), the circulating pump (4) is arranged in the circulating pipeline (62) and is used for pumping water in the circulating groove (3) into the water sealing groove (11) for circulation,

a certain amount of water is stored in the circulating tank (3), when the bell jar (10) of the wet gas holder is at the highest position, the liquid level in the circulating tank (3) is set to be liquid level (a),

the control system (5) comprises a water seal tank liquid level detection module (51), a circulating tank liquid level detection module (52), a circulating pump control module (53) and a water supplementing regulating valve control module (54),

comprises the following steps of overflowing water circulation step (S110), closing a water supplementing regulating valve (21), controlling the circulating pump (4) by the circulating pump control module (53) to enable the circulating pump (4) to continuously pump water in the circulating tank (3) into the water seal tank (11),

a water seal tank liquid level drop judging step (S120, S130), wherein the water seal tank liquid level detecting module (51) calculates the difference value between the water seal tank liquid level (B) of the water seal tank (11) and the overflow port liquid level (B) according to the detection value of the water seal tank liquid level meter (12), the difference value is used as a water seal tank liquid level drop value (U), judges whether the water seal tank liquid level drop value (U) is larger than a first threshold value (U), and outputs a water supplementing signal when the water seal tank liquid level drop value (U) is larger than the first threshold value (U),

a circulating tank liquid level drop judging step (S140, S150), wherein the circulating tank liquid level detecting module (52) calculates the difference value between the circulating tank liquid level (A) of the circulating tank (3) and the set liquid level (a) of the circulating tank according to the detection value of the circulating tank liquid level meter (31), the difference value is used as a circulating tank liquid level drop value (V), judges whether the circulating tank liquid level drop value (V) is larger than a second threshold value (V), and outputs a water supplementing signal when the circulating tank liquid level drop value (V) is larger than the second threshold value (V),

and (S170) supplementing water, namely starting the water supplementing regulating valve (21) to supplement water for the water seal tank (11) when the water seal tank liquid level detection module (51) or any one of the circulating tank liquid level detection modules (52) receives a water supplementing signal, until the water seal tank liquid level (B) of the water seal tank (11) is equal to the overflow port liquid level (B), or closing the water supplementing regulating valve (21) when the circulating tank liquid level (A) of the circulating tank (3) is equal to the set liquid level (a).

7. The water replenishment method according to claim 6, further comprising a circulation pump shut-off step (S160), wherein the circulation pump control module (53) shuts off the circulation pump (4) during the period in which the circulation tank level detection module (52) outputs the replenishment signal.

8. The water replenishment method according to claim 6, wherein the first threshold value (u) is set at 90% of the overflow port level (b) and the second threshold value (v) is set at 5% -30% of the set level (a) of the circulation tank.

9. The method for replenishing water of a wet gas cabinet according to any one of claims 6 to 8, wherein the water replenishing device comprises a backup pump (41), a water inlet pipe and a water outlet pipe of the backup pump (41) are connected in parallel with the circulating pump (4),

the method further comprises a circulating pump switching step (200), wherein the circulating pump control module (53) switches the circulating pump (4) to the standby pump (41) when detecting the fault of the circulating pump (4), and the standby pump (41) continuously pumps the water in the circulating tank (3) into the water seal tank (11).

10. The water replenishing method according to claim 9, wherein in the circulating pump switching step (200), the circulating pump (4) is judged to be failed when the liquid level change locus and the moving locus are inconsistent according to the liquid level change locus in the circulating tank (3) and the moving locus of the bell jar (10).

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