CN114797396A - Method for treating hydrocarbon combustible gas and hydrogen sulfide gas in underground closed space - Google Patents
Method for treating hydrocarbon combustible gas and hydrogen sulfide gas in underground closed space Download PDFInfo
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- CN114797396A CN114797396A CN202110085424.2A CN202110085424A CN114797396A CN 114797396 A CN114797396 A CN 114797396A CN 202110085424 A CN202110085424 A CN 202110085424A CN 114797396 A CN114797396 A CN 114797396A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/30—Controlling by gas-analysis apparatus
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/52—Hydrogen sulfide
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B15/00—Preventing escape of dirt or fumes from the area where they are produced; Collecting or removing dirt or fumes from that area
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0027—General constructional details of gas analysers, e.g. portable test equipment concerning the detector
- G01N33/0036—Specially adapted to detect a particular component
- G01N33/0044—Specially adapted to detect a particular component for H2S, sulfides
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0027—General constructional details of gas analysers, e.g. portable test equipment concerning the detector
- G01N33/0036—Specially adapted to detect a particular component
- G01N33/0047—Specially adapted to detect a particular component for organic compounds
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
- G08B21/02—Alarms for ensuring the safety of persons
- G08B21/12—Alarms for ensuring the safety of persons responsive to undesired emission of substances, e.g. pollution alarms
- G08B21/16—Combustible gas alarms
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Abstract
The invention discloses a method for treating hydrocarbon combustible gas and hydrogen sulfide gas in an underground closed space. When the hydrocarbon combustible gas detector (17) detects that the concentration of the hydrocarbon combustible gas reaches the alarm concentration, the hydrocarbon combustible gas detector alarms that the first pair of auxiliary contacts and the hydrocarbon combustible gas detector alarms that the second pair of auxiliary contacts are closed. When the hydrogen sulfide gas detector (16) detects that the concentration of the hydrogen sulfide gas reaches the alarm concentration, the hydrogen sulfide gas detector alarms that the first pair of auxiliary contacts and the hydrogen sulfide gas detector alarms that the second pair of auxiliary contacts are closed. The electromagnetic valve (3) is opened, and the vacuum air pump (12) is started. The gas in the underground closed space (13) enters the adsorption box (5) through the gas collection cover (1) and the suction gas conveying pipe (2) for physical adsorption, and then enters the treatment container (8) through the treatment gas conveying pipe (71) for treating the residual hydrogen sulfide gas. The invention is mainly used in the device area of petrochemical refineries.
Description
Technical Field
The invention relates to a method for treating hydrocarbon combustible gas and hydrogen sulfide gas in an underground closed space in the petrochemical industry.
Background
In the petrochemical refinery equipment area, there are underground enclosed spaces such as pipe ditches and underground valve wells. When a leak occurs in a process pipeline or equipment on the ground, the leaking gas is sometimes hydrocarbon combustible gas and hydrogen sulfide gas. The density of hydrocarbon combustible gas is generally higher than that of air, and the hydrocarbon combustible gas slowly permeates into underground closed space and accumulates to form gas cloud cluster, and finally dangerous concentration and volume can be achieved. Once an ignition source is met, flash explosion is caused, and life and property loss is caused. Hydrogen sulfide (H) 2 S) medium content (e.g., coal gasification, sulfur recovery, atmospheric and vacuum, sour water stripping, desulfurization and deodorization), when hydrogen sulfide leaks, it will exist in a gas phase due to its very low boiling point and will diffuse very easily. The density of the hydrogen sulfide gas is higher than that of air, and the hydrogen sulfide gas is easy to accumulate in an underground closed space to form gas cloud, and the concentration is continuously increased to a dangerous threshold value. Once the inspection and maintenance personnel enter the device by mistake, danger is caused. If water is accumulated in the underground closed space due to rain, hydrogen sulfide is easy to dissolve in water, and a hydrogen sulfide weak acid water immersion environment is formed, so that the underground closed space has certain corrosivity on metal pipelines and valves.
When the gas cloud cluster in the underground closed space is not interfered externally, the concentration volume is continuously increased and cannot be reversed. Even if the leakage source on the ground is eliminated, a dangerous area can be formed in the underground closed space for a long time, and the position of the dangerous area is fixed, so that the accident probability is increased. GB/T50493-2019 proposes the detection requirement of the occasion in section 4.4.4, and most of the existing underground closed spaces are provided with gas detectors. However, when the concentration of the hydrocarbon combustible gas and the hydrogen sulfide gas is found to be over-high, the alarm is required to be carried out manually and timely. When manual treatment is carried out, the cover plate of the underground closed space needs to be lifted, and traffic is affected. The explosion-proof powerful fan is used for blowing air into the underground closed space, and the underground closed space is small in inlet and outlet and the air cloud cluster is arranged at the deep bottom, so that the wind direction is required to be downward, the operation is not convenient enough, and the accumulated air is difficult to disperse. For hydrogen sulfide leakage, strong wind dispersion will cause olfactory contamination of larger areas in the periphery, due to the low olfactory threshold of hydrogen sulfide. If the extinguishing ball or the dry powder is used for extinguishing the hydrogen sulfide gas, the underground closed space is inconvenient to clean after the extinguishing ball or the dry powder is limited by the space.
Disclosure of Invention
The invention aims to provide a method for treating hydrocarbon combustible gas and hydrogen sulfide gas in an underground closed space, which solves the problems of inconvenient operation, olfactory pollution of peripheral areas and the like in the conventional method.
In order to solve the problems, the invention adopts the technical scheme that: a method for treating hydrocarbon combustible gas and hydrogen sulfide gas in an underground closed space is characterized by comprising the following steps: gas in the underground closed space enters a hydrocarbon combustible gas detector through a hydrocarbon combustible gas detector sampling pipe, enters a hydrogen sulfide gas detector through a hydrogen sulfide gas detector sampling pipe, when the hydrocarbon combustible gas detector detects that the concentration of the hydrocarbon combustible gas reaches an alarm concentration, the hydrocarbon combustible gas detector alarms that a first pair of auxiliary contacts and a second pair of auxiliary contacts of the hydrocarbon combustible gas detector are closed, when the hydrogen sulfide gas detector detects that the concentration of the hydrogen sulfide gas reaches the alarm concentration, the hydrogen sulfide gas detector alarms that the first pair of auxiliary contacts and the second pair of auxiliary contacts of the hydrogen sulfide gas detector are closed, after the hydrocarbon combustible gas detector alarms that the first pair of auxiliary contacts and/or the first pair of auxiliary contacts of the hydrogen sulfide gas detector are closed, the electromagnetic valve is electrified and excited to open, so that a hydrocarbon suction gas conveying pipe is unblocked, and the hydrocarbon combustible gas detector alarms that the second pair of auxiliary contacts and/or the hydrogen sulfide gas detector alarms that the second pair of auxiliary contacts and/or the second pair of the hydrogen sulfide gas detector alarms After the auxiliary contact is closed, the vacuum air pump is put into use, the relay primary coil circuit is closed, a pair of output contacts of the relay is put into use by the vacuum air pump to be closed, the electric automatic pump starting loop of the vacuum air pump is connected, the vacuum air pump is started, gas in the underground closed space enters the gas collecting cover, enters the adsorption box through the suction gas conveying pipe to be physically adsorbed, all hydrocarbon combustible gas and part of hydrogen sulfide gas are adsorbed, the adsorbed gas enters the treatment container through the treatment gas conveying pipe to treat the rest hydrogen sulfide gas, the treated gas is clean gas and enters the vacuum air pump through the treatment gas output pipe.
The invention has the following beneficial effects: 1. the invention can automatically detect hydrocarbon combustible gas and hydrogen sulfide gas in the underground closed space, automatically suck the hydrocarbon combustible gas and the hydrogen sulfide gas out of the underground closed space for treatment, timely reduce the concentration and the volume of dangerous hydrocarbon combustible gas and hydrogen sulfide gas clouds in the underground closed space, reduce the gas concentration to a safety threshold, or directly eliminate the gas clouds, prevent gas accumulation and concentration exceeding standards, and reduce the probability of accidents in a long-term dangerous environment. 2. The treatment process is carried out automatically, manual intervention is not needed after the device is put into use, the operation is easy, and the problem of inconvenience in manual treatment operation is solved. 3. The cover plate of the underground closed space does not need to be lifted during treatment, and the pipeline and the components of the device can be arranged underground or away from the cover plate of the underground closed space and the position of the ground nearby the cover plate, so that traffic on the ground is not influenced. 4. The gas pumped out from the underground closed space is physically adsorbed in the adsorption box and chemically treated in the treatment container, so that hydrocarbon combustible gas and hydrogen sulfide gas are treated and clean gas is discharged. Thus reducing the secondary pollution of hydrocarbon combustible gas and hydrogen sulfide gas, being beneficial to environmental protection, eliminating smell pollution of peripheral areas and protecting the safety of operators. 5. If the hydrocarbon combustible gas detector and the hydrogen sulfide gas detector do not trigger alarm, the concentration of the hydrocarbon combustible gas and the hydrogen sulfide gas in the underground closed space does not exceed the standard; the vacuum pump, the treatment container and the adsorption tank can be temporarily stopped to save energy consumption. 6. The invention is easy to implement in engineering, has low investment and does not need high-end complex special products. The device can simultaneously treat hydrocarbon combustible gas and hydrogen sulfide gas in a plurality of relatively concentrated underground closed spaces in the nearby area, and the core components of the vacuum air pump, the adsorption tank and the treatment container can be shared, so that the investment can be saved. 7. The device has the advantages of convenient pipeline removal and easy online removal and replacement of the adsorption tank and the treatment container. The adsorption tank and the treatment container can be designed to be movable on a vehicle, movable wheels can be arranged at the bottom of the adsorption tank and are convenient to move, and the adsorption tank and the treatment container are easy to be sent to a specialized centralized treatment place for maintenance and repair.
The invention is mainly used in the device area of petrochemical refineries.
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments. The drawings and detailed description do not limit the scope of the invention as claimed.
Drawings
FIG. 1 is a schematic view of an apparatus for treating hydrocarbon combustible gas and hydrogen sulfide gas in an underground enclosed space according to the present invention.
Fig. 2 is a detailed wiring schematic of a portion of the circuit of the present invention.
Fig. 3 is an enlarged view of the gas collection enclosure of fig. 1.
In fig. 1, 2 and 3, like reference numerals denote like features. The reference numerals denote: 1-a gas collection hood; 2-a suction gas delivery pipe; 3, an electromagnetic valve; 4-hand valve; 5, an adsorption tank; 6-adsorbing material sleeve; 71-a treatment gas delivery pipe; 72-treated gas outlet pipe; 8-a treatment vessel; 9-foam breaking net; 10-treating the solution; 11-gas discharge pipe; 12-a vacuum air pump; 13-underground closed space; 131-a cover plate; 14-a cable; 15-ground; 16-hydrogen sulfide gas detector; 161-hydrogen sulfide gas detector alarm first pair of auxiliary contacts; 162-hydrogen sulfide gas detector alarm second pair of auxiliary contacts; 17-hydrocarbon combustible gas detector; 171-hydrocarbon combustible gas detector alarm first pair of auxiliary contacts; 172-hydrocarbon combustible gas detector alarm second pair of auxiliary contacts; 181-sampling tube of hydrocarbon combustible gas detector; 182-a hydrogen sulfide gas detector sampling tube; 19-field explosion-proof junction box. 201-knob to allow automatic switch; 202-a pair of contacts that allow automatic commissioning of the switch; 21-external power supply; 211-a connection terminal of an external power supply; 212-another connection terminal of an external power supply; 22-vacuum air pump application relay. 221-putting a relay primary coil into a vacuum air pump; 222-a pair of output contacts of a relay for use in a vacuum air pump; 231-a connection terminal of a relay for use in a vacuum air pump; 232-another connection terminal of the vacuum pump application relay.
Detailed Description
Referring to fig. 1 and 2, the device for treating hydrocarbon combustible gas and hydrogen sulfide gas in an underground closed space (referred to as the device of the invention for short) of the invention comprises a hydrocarbon combustible gas detector 17, a hydrogen sulfide gas detector 16, a hydrocarbon combustible gas detector sampling tube 181, a hydrogen sulfide gas detector sampling tube 182, a gas collection cover 1, a suction gas delivery tube 2, an adsorption box 5, a treatment gas delivery tube 71, a treatment container 8, a treatment gas output tube 72, a vacuum air pump 12 and a circuit system. The top of the underground closed space 13 is provided with a cover plate 131, and the upper surface of the cover plate 131 is flush with the ground 15. The underground enclosed space 13 is communicated with the atmosphere through gaps, openings and the like.
The inlet of the sampling pipe 181 of the hydrocarbon combustible gas detector is located at the lower part of the underground closed space 13, and the inlet is the detection position of the hydrocarbon combustible gas detector 17. The sampling pipe 181 of the hydrocarbon combustible gas detector passes through the side wall of the underground closed space 13 and the underground outside the underground closed space 13, and the outlet extends out of the ground 15 beside the cover plate 131 and is connected with the hydrocarbon combustible gas detector 17. The inlet of the hydrogen sulfide gas detector sampling pipe 182, which is the detection position of the hydrogen sulfide gas detector 16, is located at the lower part of the underground enclosed space 13. The sampling tube 182 of the hydrogen sulfide gas detector passes through the side wall of the underground closed space 13 and the underground outside the underground closed space 13, and the outlet extends out of the ground 15 beside the cover plate 131 and is connected with the hydrogen sulfide gas detector 16. The hydrocarbon gas detector 17 and the hydrogen sulfide gas detector 16 are both located above the ground 15 beside the cover plate 131.
The gas collection cover 1 is located at the lower part of the underground closed space 13 and is close to the inlet of the hydrocarbon combustible gas detector sampling pipe 181 and the inlet of the hydrogen sulfide gas detector sampling pipe 182. The gas collecting hood 1 shown in fig. 1 and 3 has a conical shape in order to increase the suction area and increase the suction effect. The top taper angle A of the gas collecting cover 1 is generally 100-140 degrees; the diameter d of the bottom opening is generally 300-350 mm, and the bottom opening is installed downwards to avoid water vapor suction. The gas collecting cover 1 may be made of thin stainless steel plate, plastic plate, etc., and has high plasticity and hydrogen sulfide corrosion resistance. In order to prevent frequent start-stop of the vacuum suction pump 12, the bottom opening of the gas collection hood 1 is preferably located near or below the level of the inlet of the hydrocarbon gas detector sampling tube 181 and the inlet of the hydrogen sulfide gas detector sampling tube 182; the opening is preferably not directly opposite the inlet.
The inlet of the suction gas delivery tube 2 is connected to the top of the gas collection hood 1. The suction gas delivery pipe 2 passes through the side wall of the underground enclosed space 13 and the underground outside the underground enclosed space 13, and the outlet extends from the ground 15 beside the cover plate 131 and is connected with the adsorption tank 5, and the adsorption tank 5 is positioned beside the cover plate 131. The adsorption box 5 is made of stainless steel (for example, 316SS), adopts a sealing design, and is internally provided with an adsorption material sleeve 6. The size of the adsorption tank 5 is preferably such that the adsorption tank 5 can move in a vehicle; the bottom of the adsorption box 5 can be provided with movable wheels which are convenient to move. The suction box 5 is preferably designed in a cylindrical shape with maintenance openings left at both ends for replacement of the suction sleeve 6 and with strength to withstand the vacuum generated by the vacuum suction pump 12. The outlet of the suction gas delivery pipe 2 is inserted into the adsorbing material sleeve 6, and the adsorbing material sleeve 6 may be provided in one (as shown in fig. 1) or more, depending on the number of the suction gas delivery pipes 2. The adsorbing material is arranged in the interlayer of the cylinder wall of the adsorbing material sleeve 6 and is used for adsorbing all hydrocarbon combustible gas and part of hydrogen sulfide gas so as to meet the requirement of environmental protection and emission. The pressure drop across the adsorbent material layer should be as small as possible. The adsorbent material may be activated carbon, molecular sieves (e.g., zeolites), etc.; the invention recommends the use of activated carbon, and the cost performance is higher.
The hand valve 4 and the electromagnetic valve 3 are arranged on the pipe section of the suction gas conveying pipe 2 between the ground 15 and the adsorption tank 5. The hand valve 4 is generally a stainless steel ball valve, and plays a role in disassembly and isolation. The electromagnetic valve 3 is used for controlling whether the suction gas conveying pipe 2 is put into use, and an explosion-proof single-electric control two-position two-way electromagnetic valve can be used; the valve core of the valve body is made of stainless steel, can resist hydrogen sulfide corrosion, and is designed to be explosion-proof according to explosion-proof area division. To accommodate the complexity of installation and resistance to hydrogen sulfide corrosion in the underground enclosure 13, the suction gas duct 2 is typically a stainless steel bayonet (e.g., 316SS) that is easily bent and has a large enough inner diameter to provide suction.
The pumping gas delivery pipe 2, the hydrocarbon combustible gas detector sampling pipe 181 and the hydrogen sulfide gas detector sampling pipe 182 can be buried underground with appropriate lengths, and extend out of the ground 15 at a reasonable position beside the cover plate 131, so that the traffic of the section where the cover plate 131 is located is not influenced.
The processing container 8 is designed to be sealed, is made of high-strength plastic which is resistant to hydrogen sulfide and corrosion of the processing solution 10, glass fiber reinforced plastics or metal with a reinforcing frame inside, and has strength capable of resisting the vacuum degree generated by the vacuum air pump 12 and preventing deformation. The processing container 8 is preferably sized so that the processing container 8 can be moved in a vehicle. The bottom of the processing container 8 can be provided with movable wheels which are convenient to move. The treatment vessel 8 and the adsorption tank 5 are typically placed on a support or trolley, not shown, on the ground 15. The treatment container 8 is filled with a treatment solution 10, a foam breaking net 9 is arranged in a space above the treatment solution 10, and the foam breaking net 9 is made of a corrosion-resistant material.
The treatment solution 10 is used to treat hydrogen sulfide and may be selected according to local market conditions. Sodium hydroxide solution is recommended to react with hydrogen sulfide as follows: h 2 S+2NaOH＝Na 2 S+2H 2 O, the product does not cause secondary pollution. Other alkaline solutions (e.g., sodium bicarbonate solution), or solutions with oxidizing properties (e.g., potassium permanganate solution), may also be used, if market conditions do not permit. The solution is aqueous solution, and the concentration of the solution is as high as possible, so that the service life of the solution is prolonged.
One end of the treatment gas transport pipe 71 is connected to the gas outlet of the adsorption tank 5, and the other end thereof is inserted below the liquid surface of the treatment solution 10 in the treatment container 8. One end of the treatment gas output pipe 72 is connected with the gas phase space above the defoaming net 9 in the treatment container 8, and the other end is connected with the inlet of the vacuum suction pump 12. The process gas supply line 71 and process gas take-off line 72 are typically made of stainless steel (e.g., 316SS) that is resistant to hydrogen sulfide corrosion. When the suction gas delivery pipe 2 is one, the pipe diameters of the treatment gas delivery pipe 71 and the treatment gas output pipe 72 are the same as the pipe diameter of the suction gas delivery pipe 2; when the suction gas delivery pipe 2 is plural, the pipe diameters of the process gas delivery pipe 71 and the process gas output pipe 72 can be increased as appropriate. The vacuum pump 12 has a gas discharge pipe 11, and the hand valve 4 is provided on both the process gas feed pipe 71 and the process gas discharge pipe 72. The vacuum air pump 12 is generally made of an explosion-proof type and hydrogen sulfide corrosion resistant material; the power of the pump can be selected according to the size of the underground enclosure 13 and the pump motor can be of a type that allows automatic starting.
When the processing container 8 is evacuated by the vacuum pump 12, the pressure of the processing solution 10 transferred in all directions is constant. When the solenoid valve 3 on the suction gas delivery pipe 2 is opened and the pipeline is open, the gas containing hydrogen sulfide is sucked into the treatment container 8 below the liquid level of the treatment solution 10, and the hydrogen sulfide and the treatment solution 10 are subjected to chemical reaction. The hydrogen sulfide is readily soluble in water and also physically dissolved, and the reduction rate can be increased by entering below the liquid level of the treating solution 10. After the gas containing hydrogen sulfide is treated by the treatment solution 10, the remaining harmless clean gas (mainly air) forms bubbles to emerge from the liquid surface of the treatment solution 10, and the bubbles are broken at the foam breaking net 9. The foam breaker 9 prevents large bubbles or moisture entrained with the clean gas from entering the downstream vacuum pump 12. The remaining harmless clean gas flowing upwards through the demister 9 is pumped off by a vacuum pump 12.
Referring to fig. 1 and 2, the hydrocarbon gas sensor 17 has a first pair of auxiliary hydrocarbon gas sensor alarm contacts 171 and a second pair of auxiliary hydrocarbon gas sensor alarm contacts 172. The hydrogen sulfide gas detector 16 has a first pair of auxiliary contacts 161 for hydrogen sulfide gas detector alarm and a second pair of auxiliary contacts 162 for hydrogen sulfide gas detector alarm. The hydrocarbon combustible gas detector alarm first pair of auxiliary contacts 171, the hydrocarbon combustible gas detector alarm second pair of auxiliary contacts 172, one end of the hydrogen sulfide gas detector alarm first pair of auxiliary contacts 161 and one end of the hydrogen sulfide gas detector alarm second pair of auxiliary contacts 162 are connected with a connecting terminal 211 of an external power supply through a pair of contacts 202 allowing an automatic switch to be turned on, the hydrocarbon combustible gas detector alarm first pair of auxiliary contacts 171 and the other end of the hydrogen sulfide gas detector alarm first pair of auxiliary contacts 161 are connected with one connecting terminal of a solenoid valve 3 electrified exciting circuit, the other connecting terminal of the solenoid valve 3 electrified exciting circuit is connected with the other connecting terminal 212 of the external power supply, and one connecting terminal 211 of the external power supply and the other connecting terminal 212 of the external power supply are connected with the external power supply 21. The external power supply 21 is generally a 220 v ac power supply or a 24 v dc power supply, and is used for supplying power to the solenoid valve 3 and driving the vacuum pump application relay 22. The circuit in fig. 1 is only schematically illustrated, and one cable 14 is actually a wire with two or more cores. In fig. 1 and 2, the cable 14 is shown in dashed lines.
The hydrocarbon combustible gas detector alarms the second pair of auxiliary contacts 172 and the hydrogen sulfide gas detector alarms the other end of the second pair of auxiliary contacts 162 is connected with one end of a vacuum pump operation relay primary coil 221 of the vacuum pump operation relay 22, and the other end of the vacuum pump operation relay primary coil 221 is connected with the other connecting terminal 212 of the external power supply. The vacuum pump application relay 22 is provided with a pair of output contacts 222 of the vacuum pump application relay, one end of the pair of output contacts 222 is connected to one connection terminal 231 of the vacuum pump application relay, and the other end is connected to the other connection terminal 232 of the vacuum pump application relay. One connection terminal 231 of the vacuum pump operation relay is connected with one connection terminal of the electric automatic pump starting circuit of the vacuum pump 12, and the other connection terminal 232 of the vacuum pump operation relay is connected with the other connection terminal of the electric automatic pump starting circuit of the vacuum pump 12. The connections between the electrical components are all connected by cables 14.
The vacuum pump operation relay 22, the pair of contacts 202 allowing the automatic operation switch, one connection terminal 211 of the external power supply, the other connection terminal 212 of the external power supply, one connection terminal 231 of the vacuum pump operation relay, and the other connection terminal 232 of the vacuum pump operation relay are generally provided in the field explosion-proof connection box 19, and the knob 201 allowing the automatic operation switch is provided on the housing of the field explosion-proof connection box 19. The field explosion-proof junction box 19 is typically disposed above the ground 15 adjacent the underground enclosure 13 in a suitable location for easy access by personnel, and is secured to a support on the ground 15, not shown.
The method for treating hydrocarbon combustible gas and hydrogen sulfide gas in the underground closed space by adopting the device comprises the following steps:
the gas (the mixed gas of the hydrocarbon combustible gas, the hydrogen sulfide gas and the air) in the underground closed space 13 enters the hydrocarbon combustible gas detector sampling pipe 181 from the inlet of the hydrocarbon combustible gas detector sampling pipe 181 and enters the hydrocarbon combustible gas detector 17, and the gas in the underground closed space 13 also enters the hydrogen sulfide gas detector sampling pipe 182 from the inlet of the hydrogen sulfide gas detector sampling pipe 182 and enters the hydrogen sulfide gas detector 16. When the hydrocarbon combustible gas detector 17 detects that the concentration of the hydrocarbon combustible gas reaches the alarm concentration, the hydrocarbon combustible gas detector 17 alarms, and the hydrocarbon combustible gas cloud cluster with the concentration exceeding the standard appears at the detection position. At this time, the hydrocarbon gas detector alarms that the first pair of auxiliary contacts 171 and the hydrocarbon gas detector alarms that the second pair of auxiliary contacts 172 are closed at the same time. The electromagnetic valve 3 is designed to be normally uncharged, after the hydrocarbon combustible gas detector alarms that the first pair of auxiliary contacts 171 are closed, the electromagnetic valve 3 is electrified and excited to open the electromagnetic valve 3 (if the electromagnetic valve 3 is opened because the concentration of the hydrogen sulfide gas exceeds the standard, the electromagnetic valve is kept in an open state), and the suction gas conveying pipe 2 is unblocked. After the hydrocarbon combustible gas detector alarms that the second pair of auxiliary contacts 172 are closed, the circuit of the vacuum air pump commissioning relay primary coil 221 is closed, the pair of output contacts 222 of the vacuum air pump commissioning relay is attracted and closed (the pair of output contacts 222 are normally open), the electric automatic pump starting loop of the vacuum air pump 12 is connected, the vacuum air pump 12 is automatically started (the vacuum air pump 12 is kept in a starting state if the concentration of hydrogen sulfide gas exceeds the standard), and vacuumizing is started. The gas in the underground closed space 13 enters the gas collecting hood 1, enters the adsorption box 5 through the suction gas conveying pipe 2 for physical adsorption, and adsorbs all hydrocarbon combustible gas and part of hydrogen sulfide gas. The adsorbed gas is introduced into the treatment vessel 8 through the treatment gas transport pipe 71, and the remaining hydrogen sulfide gas is treated. The treated gas is clean gas, enters the vacuum air pump 12 through the treated gas output pipe 72, and is sent to a safe position from the gas discharge pipe 11 to be discharged.
When the hydrogen sulfide gas detector 16 detects that the concentration of the hydrogen sulfide gas reaches the alarm concentration, the hydrogen sulfide gas detector 16 gives an alarm, which indicates that the hydrogen sulfide gas cloud cluster with the concentration exceeding the standard appears at the detection position. At this time, the hydrogen sulfide gas detector alarms that the first pair of auxiliary contacts 161 and the hydrogen sulfide gas detector alarms that the second pair of auxiliary contacts 162 are closed at the same time. After the hydrogen sulfide gas detector alarms that the first pair of auxiliary contacts 161 is closed, the electromagnetic valve 3 is electrified and excited to open the electromagnetic valve 3 (if the electromagnetic valve 3 is opened because the concentration of hydrocarbon combustible gas exceeds the standard, the electromagnetic valve is kept in an open state), so that the suction gas conveying pipe 2 is unblocked. After the hydrogen sulfide gas detector alarms that the second pair of auxiliary contacts 162 are closed, the circuit of the vacuum air pump commissioning relay primary coil 221 is closed, the pair of output contacts 222 of the vacuum air pump commissioning relay is attracted and closed, the electric automatic pump starting loop of the vacuum air pump 12 is connected, the vacuum air pump 12 is automatically started (the vacuum air pump 12 is kept in a starting state if the hydrocarbon combustible gas concentration exceeds the standard), and vacuumizing is started. The gas in the underground closed space 13 enters the gas collecting cover 1, enters the adsorption box 5 through the suction gas conveying pipe 2 for physical adsorption, and adsorbs all hydrocarbon combustible gas and part of hydrogen sulfide gas. The adsorbed gas is introduced into the treatment vessel 8 through the treatment gas transport pipe 71, and the remaining hydrogen sulfide gas is treated. The treated gas is clean gas, enters the vacuum air pump 12 through the treated gas output pipe 72, and is sent to a safe position from the gas discharge pipe 11 to be discharged.
The alarm concentration of hydrocarbon combustible gas and hydrogen sulfide gas can be determined according to national standards (such as GB/T50493-2019), and a first-level alarm limit value is recommended to be selected.
When the concentration of the hydrocarbon combustible gas in the underground closed space 13 is lower than the alarm concentration, the hydrocarbon combustible gas detector alarms that the first pair of auxiliary contacts 171 and the second pair of auxiliary contacts 172 are all simultaneously opened because they are not maintained. When the concentration of the hydrogen sulfide gas in the underground closed space 13 is lower than the alarm concentration, the hydrogen sulfide gas detector alarms that the first pair of auxiliary contacts 161 and the second pair of auxiliary contacts 162 are all disconnected at the same time because they are not maintained. When the above-mentioned first pair of auxiliary contacts 171 and second pair of auxiliary contacts 172 are opened and the first pair of auxiliary contacts 161 and second pair of auxiliary contacts 162 are also opened, the solenoid valve 3 is closed; the vacuum pump application relay primary coil 221 is electrically disconnected, the pair of output contacts 222 of the vacuum pump application relay is disconnected, the electric automatic pump start circuit of the vacuum pump 12 is disconnected, and the operation of the vacuum pump 12 is automatically stopped.
In a word, when the hydrocarbon combustible gas and the hydrogen sulfide gas in the underground closed space 13 both reach the alarm concentration, the hydrocarbon combustible gas detector alarms that the first pair of auxiliary contacts 171, the hydrocarbon combustible gas detector alarms that the second pair of auxiliary contacts 172, the hydrogen sulfide gas detector alarms that the first pair of auxiliary contacts 161 and the hydrogen sulfide gas detector alarms that the second pair of auxiliary contacts 162 are closed. When the hydrocarbon combustible gas reaches the alarm concentration and the hydrogen sulfide gas is lower than the alarm concentration, the first pair of auxiliary contacts 171 and the second pair of auxiliary contacts 172 are closed, and the first pair of auxiliary contacts 161 and the second pair of auxiliary contacts 162 are opened. When the hydrocarbon combustible gas is lower than the alarm concentration and the hydrogen sulfide gas reaches the alarm concentration, the first pair of auxiliary contacts 171 and the second pair of auxiliary contacts 172 are opened, and the first pair of auxiliary contacts 161 and the second pair of auxiliary contacts 162 are closed.
When the knob 201 allowing the automatic commissioning switch is manually rotated to the commissioning position, the pair of contacts 202 of the automatic commissioning switch are allowed to be closed, the automatic commissioning function is enabled, and the device can normally operate. When the weather condition that the device of the invention is not suitable for automatic commissioning is met, or the device of the invention is in a maintenance state, and the adsorbing material of the adsorption box 5 or the treatment solution 10 of the treatment container 8 is replaced, the knob 201 of the automatic commissioning switch is manually rotated to the maintenance position, the pair of contacts 202 of the automatic commissioning switch is allowed to be disconnected, and the device of the invention is stopped to be used.
The scheme of the invention can be used for treating hydrocarbon combustible gas and hydrogen sulfide gas in one underground closed space (as described above), and can also be used for treating a plurality of (generally 2-5) relatively concentrated hydrocarbon combustible gas and hydrogen sulfide gas in the underground closed space. When the device is used for treating hydrocarbon combustible gas and hydrogen sulfide gas in a plurality of underground closed spaces, the adsorption box 5, a treatment gas delivery pipe 71, a treatment container 8, a treatment gas output pipe 72, a vacuum air pump 12, a vacuum air pump application relay 22, an on-site explosion-proof junction box 19, an automatic application permission switch (comprising a knob 201 of the automatic application permission switch and a pair of contacts 202 of the automatic application permission switch), an external power supply 21, one connecting terminal 211 of the external power supply and the other connecting terminal 212 of the external power supply are respectively arranged one by one and used as a public component and a pipeline. The rest of the pipelines, components, valves, electrical elements and the like (such as the hydrocarbon combustible gas detector 17, the hydrogen sulfide gas detector 16, the hydrocarbon combustible gas detector sampling pipe 181, the hydrogen sulfide gas detector sampling pipe 182, the gas collecting cover 1, the suction gas conveying pipe 2, the electromagnetic valve 3 and the like) arranged in the single underground closed space are respectively provided with one set of each underground closed space, the connection relationship is basically the same, and the underground closed spaces are respectively and independently operated. For example, for a hydrocarbon combustible gas detector of the hydrocarbon combustible gas detector arranged in each underground closed space, a first pair of auxiliary contacts for alarming, and a second pair of auxiliary contacts for alarming are arranged, a hydrogen sulfide gas detector of the hydrogen sulfide gas detector alarms the first pair of auxiliary contacts, and a second pair of auxiliary contacts for alarming, wherein one end of each of the first pair of auxiliary contacts and the second pair of auxiliary contacts is connected with a connecting terminal 211 of a public external power supply through a pair of contacts 202 of a public allowed automatic on-off switch. The hydrocarbon combustible gas detector alarm first pair of auxiliary contacts and the hydrogen sulfide gas detector alarm first pair of auxiliary contacts arranged in each underground closed space are respectively connected with one terminal of an electromagnetic valve electrified exciting circuit arranged in each underground closed space, and the other terminals of all the electromagnetic valve electrified exciting circuits are connected with the other terminal 212 of a public external power supply. And the other ends of the second pair of auxiliary contacts for alarming the hydrocarbon combustible gas detector and the second pair of auxiliary contacts for alarming the hydrogen sulfide gas detector arranged in each underground closed space are connected with one end of a vacuum air pump operation relay primary coil 221 of a common vacuum air pump operation relay 22, and the other end of the vacuum air pump operation relay primary coil 221 is connected with the other connecting terminal 212 of a common external power supply. The electromagnetic valve arranged in each underground closed space is controlled to be opened and closed by the first pair of auxiliary contacts for the hydrocarbon combustible gas detector alarm and the first pair of auxiliary contacts for the hydrogen sulfide gas detector alarm of the hydrocarbon combustible gas detector and the hydrogen sulfide gas detector arranged in the underground closed space respectively. The outlet of the suction gas delivery pipe 2 provided for each underground enclosed space is connected to a common adsorption tank 5; inside the adsorption tank 5, a plurality of adsorbing material sleeves 6 are provided, and the outlet of each suction gas delivery pipe 2 is inserted into one adsorbing material sleeve 6.
The device can work normally as long as hydrocarbon combustible gas and/or hydrogen sulfide gas in an underground closed space reaches the alarm concentration. When the hydrocarbon combustible gas and the hydrogen sulfide gas in all the underground closed spaces are lower than the alarm concentration, the electromagnetic valves arranged in each underground closed space are all closed, and the common vacuum air pump 12 stops working.
Claims (10)
1. A method for treating hydrocarbon combustible gas and hydrogen sulfide gas in an underground closed space is characterized by comprising the following steps: gas in the underground closed space (13) enters a hydrocarbon combustible gas detector (17) through a hydrocarbon combustible gas detector sampling pipe (181), enters a hydrogen sulfide gas detector (16) through a hydrogen sulfide gas detector sampling pipe (182), when the hydrocarbon combustible gas detector (17) detects that the concentration of the hydrocarbon combustible gas reaches the alarm concentration, the hydrocarbon combustible gas detector alarms that a first pair of auxiliary contacts (171) and a second pair of auxiliary contacts (172) of the hydrocarbon combustible gas detector are closed, when the hydrogen sulfide gas detector (16) detects that the concentration of the hydrogen sulfide gas reaches the alarm concentration, the hydrogen sulfide gas detector alarms that a first pair of auxiliary contacts (161) and a second pair of auxiliary contacts (162) are closed, and after the hydrocarbon combustible gas detector alarms that the first pair of auxiliary contacts (171) and/or the hydrogen sulfide gas detector alarms that the first pair of auxiliary contacts (161) are closed, the electromagnetic valve (3) is electrified and excited to open the electromagnetic valve (3) to ensure that the pumping gas conveying pipe (2) is unblocked, the hydrocarbon combustible gas detector alarms that a second pair of auxiliary contacts (172) and/or the hydrogen sulfide gas detector alarms that a second pair of auxiliary contacts (162) are closed, the circuit of a vacuum air pump application relay primary coil (221) is closed, a pair of output contacts (222) of the vacuum air pump application relay is attracted and closed, the electric automatic pump starting loop of the vacuum air pump (12) is connected, the vacuum air pump (12) is started, gas in the underground closed space (13) enters the gas collecting cover (1), enters the adsorption box (5) through the pumping gas conveying pipe (2) to carry out physical adsorption, all hydrocarbon combustible gas and part of hydrogen sulfide gas are adsorbed, and the adsorbed gas enters the treatment container (8) through the treatment gas conveying pipe (71), and (3) treating the residual hydrogen sulfide gas, wherein the treated gas is clean gas and enters the vacuum air pump (12) through a treated gas output pipe (72).
2. The method of claim 1, wherein: the gas in the underground closed space (13) is a mixed gas of hydrocarbon combustible gas, hydrogen sulfide gas and air.
3. The method of claim 2, wherein: the first-level alarm limit value is selected as the alarm concentration of hydrocarbon combustible gas and hydrogen sulfide gas.
4. A method according to claim 1 or 2 or 3, characterized in that: when the concentration of hydrocarbon combustible gas in the underground closed space (13) is lower than the alarm concentration, the hydrocarbon combustible gas detector alarms that the first pair of auxiliary contacts (171) and the second pair of auxiliary contacts (172) are disconnected, when the concentration of hydrogen sulfide gas in the underground closed space (13) is lower than the alarm concentration, the hydrogen sulfide gas detector alarms that the first pair of auxiliary contacts (161) and the second pair of auxiliary contacts (162) are disconnected, after all the contacts are disconnected, the electromagnetic valve (3) is closed, and the vacuum air pump (12) stops running.
5. The method of claim 1, wherein: one end of the first pair of auxiliary contacts (171) for alarming of the hydrocarbon combustible gas detector, the second pair of auxiliary contacts (172) for alarming of the hydrocarbon combustible gas detector, the first pair of auxiliary contacts (161) for alarming of the hydrogen sulfide gas detector and one end of the second pair of auxiliary contacts (162) for alarming of the hydrogen sulfide gas detector are connected with one wiring terminal (211) of an external power supply through a pair of contacts (202) allowing the automatic commissioning switch, and the pair of contacts (202) allowing the automatic commissioning switch to be closed and opened are controlled by a knob (201) allowing the automatic commissioning switch.
6. The method according to claim 1 or 2, characterized in that: the adsorption box (5) is internally provided with an adsorption material which is active carbon or molecular sieve, etc., the treatment container (8) is internally provided with a treatment solution (10), a foam breaking net (9) is arranged in a space above the treatment solution (10), and the treatment solution (10) is sodium hydroxide solution, sodium bicarbonate solution, potassium permanganate solution or copper sulfate solution, etc.
7. The method of claim 1, wherein: the adsorption tank (5) and the treatment container (8) can move on a vehicle, and movable wheels are arranged at the bottoms of the adsorption tank (5) and the treatment container (8).
8. The method according to claim 1 or 7, characterized in that: the inlet of the hydrocarbon combustible gas detector sampling pipe (181) and the inlet of the hydrogen sulfide gas detector sampling pipe (182) are both positioned at the lower part of the underground closed space (13), the hydrocarbon combustible gas detector sampling pipe (181), the hydrogen sulfide gas detector sampling pipe (182) and the suction gas conveying pipe (2) penetrate through the side wall of the underground closed space (13) and the underground outside the underground closed space (13), and the outlet extends out of the ground (15) beside the cover plate (131).
9. The method of claim 8, wherein: the gas collecting cover (1) is located at the lower part of the underground closed space (13), the shape of the gas collecting cover (1) is a conical surface, the top taper angle A is 100-140 degrees, and the diameter d of the bottom opening is (300-350) millimeters. The bottom opening of the gas collecting cover (1) is installed downwards and is positioned near or below the level of the inlet of the hydrocarbon combustible gas detector sampling pipe (181) and the inlet of the hydrogen sulfide gas detector sampling pipe (182).
10. The method according to any one of claims 1 to (9), characterized in that: the method is used for treating hydrocarbon combustible gas and hydrogen sulfide gas in one or more (generally 2-5) underground closed spaces, and when the method is used for treating the hydrocarbon combustible gas and the hydrogen sulfide gas in the plurality of underground closed spaces, the adsorption box (5), the treatment gas conveying pipe (71), the treatment container (8), the treatment gas output pipe (72), the vacuum air pump (12), the vacuum air pump application relay (22) and the field explosion-proof junction box (19) are respectively provided with one, and the adsorption box, the treatment gas conveying pipe, the treatment container, the treatment gas output pipe and the field explosion-proof junction box are used as public components and pipelines.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN207082208U (en) * | 2017-04-06 | 2018-03-09 | 颜昌凤 | A kind of gas leakage automatic exhaust device |
| CN208138066U (en) * | 2018-03-16 | 2018-11-23 | 武汉理工大学 | A kind of liquid light hydrocarbon/diesel machine double fuel volatilization gas processor |
| CN211785465U (en) * | 2020-09-11 | 2020-10-27 | 万基泰科工集团(四川)有限公司 | Underground pipe network risk evaluation device |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN207082208U (en) * | 2017-04-06 | 2018-03-09 | 颜昌凤 | A kind of gas leakage automatic exhaust device |
| CN208138066U (en) * | 2018-03-16 | 2018-11-23 | 武汉理工大学 | A kind of liquid light hydrocarbon/diesel machine double fuel volatilization gas processor |
| CN211785465U (en) * | 2020-09-11 | 2020-10-27 | 万基泰科工集团(四川)有限公司 | Underground pipe network risk evaluation device |
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