CN201014189Y - Automatic liquid discharge device of natural gas station separator - Google Patents

Abstract

An automatic liquid draining device for a natural gas station separator applied to the automatic liquid draining system of a gas field separator, comprising a separator (1), an electric ball valve (3), a metering water meter (4), a natural gas water delivery valve (5), a natural gas delivery valve The water valve (5) is in communication with the electric ball valve (3), the metering water meter (4) is in communication with the natural gas trap (5), and a separator (1) is installed on the upper part of the device. The maintenance and replacement are simple and convenient without debugging. The on-site maintenance workload of professional and technical personnel for automatic control instruments is reduced; the failure rate is low, the service life is long, and the workload of gas gathering station operators is reduced; the gas barrier is tight, preventing high-pressure gas from entering the sewage tank, reducing safety risks; The service life of the electric ball valve is extended, the workload of the gas gathering station operators is reduced, and the on-site maintenance workload of the professional technicians of the automatic control instrument is reduced; the high-pressure gas is prevented from entering the sewage tank, and the safety risk is reduced.

Description

Natural gas station separator automatic liquid draining device

technical field

The utility model is applied to the automatic liquid discharge system of the separator in the gas field, and can realize the long-term safe automatic liquid discharge of the separator, in particular, it is an automatic liquid discharge device for the separator of the natural gas station.

Background technique

The blowdown of the separator in Yulin gas field natural gas station adopts the electric ball valve automatic liquid discharge system, which consists of three parts: differential pressure liquid level transmitter, PLC control cabinet, electric ball valve and liquid discharge pipe valve. When the high and low liquid level signal sensed by the separator liquid level transmitter LT is sent to the PLC control part, then the 220V AC signal is output to the electric ball valve to control the switch of the electric ball valve, so as to realize the automatic control of the sewage discharge of the separator.

According to the automatic control principle of the separator blowdown, calculate the liquid volume of the liquid level transmitter according to the container specification for the change of the high and low liquid level, and regularly calibrate the liquid volume once, through the configuration of the PLC controller program, and use the electric ball valve The number of opening times multiplied by the liquid volume of the blowdown times is the total amount of blowdown liquid.

Production practice has proved that the failure rate of the automatic liquid discharge system of the electric ball valve of the separator is high, the liquid phase measurement error is large, and the normal operation rate is basically about 65%. When the electric ball valve fails, it is forced to manually drain the liquid, which not only increases the workload of on-site maintenance by the professional technicians of the automatic control instrument, but also easily causes high-pressure gas to enter the sewage tank if the control is not appropriate, which brings safety risks to production.

Contents of the invention

The purpose of this utility model is to provide an automatic draining device for a natural gas station separator, which is simple and convenient to maintain and replace, does not require debugging, and reduces the workload of on-site maintenance by professional technicians of automatic control instruments; the failure rate is low, the service life is long, and the The workload of gas-gathering station operators; tight gas barriers prevent high-pressure gas from entering sewage tanks, reduce safety risks, reduce engineering construction investment and gas field maintenance and transformation costs, and reduce production costs.

The utility model is achieved in that:

Including separator 1, electric ball valve 3, metering water meter 4, natural gas water delivery valve 5, natural gas water delivery valve 5 communicates with electric ball valve 3, metering water meter 4 communicates with natural gas trap 5, and separator 1 is installed on the upper part of the device .

The utility model also adopts the following technical solutions:

Use buffer tank 8 instead of natural gas trap 5 .

The bottom of the buffer tank 8 is provided with a plug 7 .

The buffer tank 8, the electric ball valve 3, the buffer tank 8, the metering water meter 4, and the flow-limiting orifice 6 are connected in sequence.

The utility model has the advantages of: implementing the natural gas trap automatic drainage system estimates an investment of 23,200 yuan, saving 20,990 yuan compared with the electric ball valve automatic drainage system, and installing 3 separators (one production separator for each gas gathering station) , two metering separators) calculation, only the electric ball valve automatic drainage system can save 62,970 yuan. The estimated one-time investment of the electric ball valve plus flow-limiting orifice automatic drainage system is 47,390 yuan. When the gas-gathering station separator electric ball valve automatic drainage system is transformed, only about 3,200 yuan will be invested.

Maintenance and replacement are simple and convenient, without debugging, which reduces the workload of on-site maintenance by professional technicians of automatic control instruments; low failure rate and long service life, reducing the workload of gas gathering station operators; tight gas barrier prevents high-pressure gas Entering the sewage tank, reducing safety risks; prolonging the service life of electric ball valves, reducing the workload of manual draining of gas gathering station operators, and reducing the workload of on-site maintenance by professional technicians of automatic control instruments; preventing high-pressure gas from entering sewage Tank 2, which reduces the security risk.

Description of drawings

Accompanying drawing 1 is the schematic diagram of the structure of the utility model natural gas trap automatic liquid discharge device;

Accompanying drawing 2 is the structural schematic diagram of the electric ball valve of the present invention plus flow-limiting orifice device.

Detailed ways

As shown in Figure 1, it is a natural gas trap liquid discharge device. When the sewage and condensate oil at the bottom of the separator 1 reach a certain liquid level, the natural gas trap 5 is automatically opened to start liquid drainage, and the sewage is driven by the pressure of the natural gas itself. Under this condition, all-weather, automatic continuous operation can be realized, so that the deposited water in the separator 1 can be drained when there is water, and automatically closed when there is no water. Finally, the accurate measurement of the liquid volume is realized through the metering water meter at the back. During the automatic liquid discharge process of the natural gas trap 5, the liquid at the bottom of the natural gas trap 5 cannot be completely drained, and an appropriate liquid level will be left to ensure zero leakage of natural gas from the drain valve. The liquid scale and scum deposited at the bottom can be removed regularly through the sewage outlet.

As shown in Figure 2, the electric ball valve is equipped with a flow-limiting orifice drain device. The liquid separated from the separator 1 first flows through the first buffer tank 8 to filter the larger dirt and impurities in the liquid and reduce the residue. 1. The stolen goods will wear the spool of the electric ball valve 3. After the electric ball valve 3 is automatically opened to discharge the sewage, the liquid flows through the second buffer tank 8 to filter the smaller solid particles and impurities to prevent the orifice of the flow-limiting orifice 6 from being blocked and the liquid to pass through. After metering by the metering water meter 4, the sewage is discharged to the sewage tank 2 through the flow-limiting orifice 6. The function of the flow-limiting orifice 6 is to increase the downstream back pressure of the electric ball valve 3 and reduce the pressure difference between the front and rear of the electric ball valve 3.

According to the technological process of the automatic draining system of the three separators, and according to the difference of the main equipment required by the draining system, the economic comparison and analysis of the three automatic draining processes are as follows:

Table 1 Economic comparison evaluation table of separator automatic drainage system

serial number Steam trap automatic drain system Electric ball valve plus restrictor orifice automatic drainage system Electric ball valve automatic drain system project Estimated price project estimated price project estimated price 1 Automatic drain valve One steam trap 23,000 yuan Electric ball valve 1 25,000 yuan Electric ball valve 1 25,000 yuan Electric ball valve control cable 50 meters 0.045 million yuan Electric ball valve control cable 50 meters 0.045 million yuan Electric ball valve signal cable 50 meters 0.0255 million yuan Electric ball valve signal cable 50 meters 0.0255 million yuan 2 Level Transmitter 1 liquid level transmitter 80,000 yuan 1 liquid level transmitter 80,000 yuan Signal cable 50 meters 0.0425 million yuan Signal cable 50 meters 0.0425 million yuan 3 PLC card Instrument card 0.218 million yuan Instrument card 0.218 million yuan Control card 0.788 million yuan Control card 0.788 million yuan 4 Shut-off valve 4 same 4 same 4 same 5 Auxiliary equipment 1 piece of restrictor hole wrench 10,000 yuan Homemade buffer tank 2 0.2 million 6 Liquid metering 1 water meter 0.02 million yuan Measuring water meter 1 0.02 million yuan Depending on the number of drains 7 insulation Electric heating cable insulation same Electric heating cable insulation same Electric heating belt insulation same Total 23,200 yuan 47.39 million yuan 44.19 million yuan

Claims (4)

1. The automatic draining device of the separator of the natural gas station, including the separator (1), electric ball valve (3), metering water meter (4), natural gas water delivery valve (5), is characterized in that: the natural gas water delivery valve (5) and The electric ball valve (3) is connected, the metering water meter (4) is connected with the natural gas trap (5), and a separator (1) is installed on the top of the device. 2. The automatic liquid draining device of the natural gas station separator according to claim 1, characterized in that: a buffer tank (8) is used instead of the natural gas trap (5). 3. The automatic liquid draining device of the natural gas station separator according to claim 1, characterized in that: the bottom of the buffer tank (8) is provided with a plug (7). 4. The automatic draining device of the natural gas station separator according to claim 1, characterized in that: buffer tank (8), electric ball valve (3), buffer tank (8), metering water meter (4), flow limiting orifice (6) Unicom in turn.

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