CN114323720B - Clay effect sealing barrier effect and gas purification treatment test device and method - Google Patents
Clay effect sealing barrier effect and gas purification treatment test device and method Download PDFInfo
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Abstract
The invention discloses a testing device and a testing method for a mud-effect-restraining sealing barrier effect and gas purification treatment. The device comprises a gas generation module, a sealing test module, a gas detection module, an automatic timing module and a purification treatment module; the sealing test module comprises a sealed hollow cylinder, wherein a test chamber is arranged in the sealed hollow cylinder; the upper end of the test chamber is communicated with the gas generation module; the gas detection module is a U-shaped pipe containing a conductivity detection liquid, the top end of the gas detection module is sealed, one end of the pipe body is connected to the bottom end of the test chamber, and the other end of the pipe body is connected to the purification treatment module; the automatic timing module is arranged on one side of the outlet of the U-shaped pipe. The testing device and the method can be used for researching the damage phenomenon and the damage mechanism of the mud effect layer under different testing conditions, quantitatively determining the optimal mixing proportion and the critical thickness threshold of the mud effect for construction so as to guide field shield construction, treating residual tail gas and greatly reducing the harm to testing personnel and the surrounding environment.
Description
Technical Field
The invention relates to the technical field of biogenic gas sealing and blocking in the shield tunnel construction process, in particular to a mud effect sealing and blocking effect and biogenic gas purification treatment test device and a test method.
Background
With the vigorous development of urban underground traffic networks, the shield method is widely applied to tunnel engineering construction. The establishment of a plurality of long-distance large-diameter cross-river and cross-sea tunnels marks that the shield tunneling technology of China has made remarkable progress, but the shield tunnel construction under complex geological conditions still has a plurality of key technical problems. Only taking the gas stratum rich in biogenic gas as an example, gas is easy to permeate into the shield and the tunnel through the excavation cabin, the mud pipe, the shield tail brush and the segment internodes in the shield tunneling process to induce personnelEngineering safety accidents such as suffocation, methane combustion, gas explosion and the like seriously threaten the safety of tunnel construction. High viscosity (500 dPa-s) and low permeability (K =3.0 × 10) to avoid osmotic diffusion of biogenic gases into the shield and tunnel interiors-9cm/s) is used to fill the excavation gap between the middle shield and the wall of the hole. Engineering experience shows that the thickness of the clayey effect layer has a remarkable influence on the sealing and blocking effect of the biogenic gas. When the effective layer thickness of the mud is too small, the biological cause gas is difficult to be completely sealed and blocked; when the effective layer thickness of the clay is too large, unnecessary material waste is caused. The influence of factors such as the gram-clay effect mix proportion, the gram-clay effect layer thickness and the gas occurrence pressure on the gram-clay effect sealing and blocking effect is tested by developing an indoor test, a mechanism of permeation and diffusion of biogenic gas in the gram-clay effect under different working conditions is disclosed, the optimal mix proportion and the thickness critical value of the gram-clay effect are quantitatively evaluated, and the method has important reference value and reference significance for safe and efficient construction of the shield rich in biogenic gas.
The preliminary research results of the literature show that the research results aiming at the gram-clay effect material are relatively few at present, and most of the research results are concentrated on the aspects of the mix proportion design of the gram-clay effect material, the deformation control of the tunnel ground surface, the soil improvement effect analysis and the like. For example: chinese invention patents CN106593451A, CN 104291775A and CN 105948572A respectively propose a mud effect material for controlling shield tunneling soil body settlement, a mud effect and construction method for shield tunneling machine, a mud effect material and a use method, but mainly research on raw materials, mixing ratio and use method of the mud effect, and do not analyze engineering characteristics and effect of the mud effect; the following steps are repeated: chinese patent Nos. CN 112983442A, CN 111706341A, CN 112160758A and CN 108590678A respectively provide a construction method for downward penetrating a pressurized gas pipeline by using a shield machine in an ultra-short distance, a construction method for downward penetrating a large-diameter sewage main pipe by using an earth pressure balance shield, a construction method for downward penetrating a slurry shield through a dike and a construction method for downward penetrating a multi-track railway based on the earth pressure balance shield in a shallow soft soil layer, but mainly fill excavation gaps between the tunnel diameter excavated by using a shield cutter head and a shield body by using a mud-effective material to avoid excessive settlement of the ground surface of a tunnel. And the following steps: the Chinese patent application CN 113153321A provides a muck improvement system for shield construction and a construction method thereof, which improves the plasticity of soil around the tunnel wall and optimizes and improves the soil of a water-rich stratum by adsorbing water in the soil by mud effect-restraining slurry.
In summary, the current research results for the gram mud effect mainly focus on material mix proportion design, tunnel ground surface deformation control and sealing water stopping effect analysis, and the research results on the gas sealing barrier effect of the gram mud effect on the biological cause are still relatively few. The influence of factors such as the gram-clay effect mix proportion, the gram-clay effect layer thickness, the gas occurrence pressure and the like on the gram-clay effect sealing and blocking effect is tested by developing a test device and a method for the gram-clay effect sealing and blocking effect and the biogenesis gas purification treatment, a permeation and diffusion mechanism of the biogenesis gas in the gram-clay effect is disclosed, and the obtaining of the thickness critical value of the gram-clay effect is particularly necessary.
Disclosure of Invention
Aiming at the technical problems, the invention aims to provide a test device and a test method for the sealing and blocking effect of the mud effect and the purification treatment of the biogenic gas, aiming at the problem that in the shield tunneling process of a gas stratum rich in biogenic gas, gas is easy to permeate into a shield and a tunnel through an excavation cabin, a mud pipe, a shield tail brush and a segment internode to induce engineering safety accidents. The device can be used for testing the influence of factors such as the gram-mud effect mix proportion, the gram-mud effect layer thickness and the gas occurrence pressure on the gram-mud effect sealing and blocking effect, revealing a mechanism of permeation and diffusion of biogenic gas in the gram-mud effect under different working conditions, and providing an effective test device and a test method for determining the optimum mix proportion and the thickness critical value of the gram-mud effect in the shield tunneling process of the stratum rich in biogenic gas.
The invention adopts the specific technical scheme that:
the invention provides a mud effect sealing and blocking effect and gas purification treatment test device, which comprises a gas generation module, a sealing test module, a gas detection module, an automatic timing module and a purification treatment module, wherein the gas generation module is used for generating a gas;
the sealing test module comprises a sealed hollow cylinder, wherein a test chamber is arranged in the sealed hollow cylinder; the upper end of the test chamber is communicated with the gas generation module;
the gas detection module is a U-shaped pipe containing a conductivity detection liquid, the top end of the gas detection module is sealed, one end of the pipe body is connected to the bottom end of the test chamber, and the other end of the pipe body is connected to the purification treatment module;
the automatic timing module is arranged on one side of the outlet of the U-shaped pipe, and the normal/rising of the liquid level of the detection liquid caused by the air pressure change enables a short circuit in the automatic timing module to be switched off/on so as to realize normal/stop timing;
the purification treatment module comprises a solution storage box and a gas purification box, a conduit at the rear end of the gas purification box is connected with a tail gas collection ball, and a gas detector is arranged between the tail gas collection ball and the gas purification box.
Further, the gas generation module is formed by connecting a common air bottle and a biological cause gas bottle through a tee joint. The common air bottle is used for air tightness inspection and biological cause gas purification treatment, the biological cause gas bottle is used for testing the time of the sealing and obstructing effect of the mud effect, and the gas component in the bottle comprises CH4、SO2、H2S, NO, CO, etc.
Further, the sealing test module comprises a hollow cylinder, wherein a test chamber is arranged in the hollow cylinder, and the upper end of the hollow cylinder is sealed by a top plate; the upper end of the test chamber is connected to a gas pipe of the gas generation module, and the bottom of the test chamber is sequentially provided with a permeable stone, a mud restraining effect, an undisturbed soil sample and a filter screen from bottom to top. The filter screen is arranged on the surface of the undisturbed soil sample, so that the undesirable phenomena of dust raising and the like under the action of air flow can be avoided.
Furthermore, the top plate is connected with the test chamber in a sealing mode through the hexagon bolts, and the rubber sealing ring is arranged between the top plate and the test chamber to enhance the sealing effect.
Furthermore, the outer walls of the hollow cylinder and the test chamber are made of transparent materials, so that the mud efficiency failure and damage process can be observed conveniently.
Further, the outer wall of the test chamber is in a smooth broken line shape.
Furthermore, the wall surface of the test chamber is a rough frosted surface, which is beneficial to enhancing the bonding strength between the mud-restraining effect and the inner wall surface and avoiding the permeation and diffusion of biogenic gas along the inner wall surface; the scale marks are arranged on the surface of the outer wall, so that favorable conditions can be provided for testing the effective layer thickness of the clayey mud.
Further, the liquid containing the conductivity detector is a magenta solution containing an electrolyte. Preferably fuchsin-sodium chloride mixed solution, wherein the fuchsin solution can be mixed with SO in the biogenic gas2The reaction produces discoloration and sodium chloride can enhance the conductivity of the solution.
Further, the solution storage box is connected with the gas purification box and is separated from the gas purification box through a partition plate and a filter screen; the solution storage box is connected to the gas detection module through an exhaust pipe; the air inlet end of the solution storage box is communicated with the air outlet end of the gas purification box through a return pipe. The gas outlet end of the gas purification box is provided with an electronic three-way valve, and the electronic three-way valve 33 is communicated with a return pipe 16 and a conduit connected with an exhaust gas collecting ball 17 respectively.
Furthermore, the gas purification box comprises three chambers, and the three chambers are filled with slaked lime, activated carbon fiber and an R-J20 molecular sieve adsorbent in sequence along the gas flow direction.
Furthermore, the automatic timing module is formed by connecting a timer, an air switch, a power supply and a protective resistor in series to form a loop, and then the timer is electrically connected with detection liquid in the U-shaped pipe to form parallel connection. When the mud effect prevention air tightness is good, a branch connected with the U-shaped pipe is disconnected, the automatic timer is in a working state, and the mud effect prevention sealing and biological cause gas blocking time is recorded in real time; when the mud-restraining effect is failed and damaged, the liquid level of the conductivity detection liquid on one side of the automatic timing module in the U-shaped pipe rises, so that the branch circuits connected with the U-shaped pipe are communicated, the protection resistor in the passage is a low-resistance resistor, the current is large after the circuit is communicated, the switch trips and is automatically disconnected after the threshold value of the air switch is reached, the automatic timer is in a broken circuit state, the recording is suspended, and the reading of the tripping moment is the time for restraining the mud-restraining effect sealing and blocking the biogenesis gas.
The second aspect of the present invention provides a method for testing the Clay seal Barrier Effect and gas treatment test apparatus according to the first aspect, comprising the steps of:
the method comprises the following steps: opening a valve of a common air bottle, closing a valve of a biological cause air bottle, introducing air into the test chamber, and checking the air tightness of the test chamber by observing the liquid level change in the U-shaped pipe of the gas detection module; if the liquid levels on the two sides of the U-shaped pipe are kept unchanged, the air tightness of the test chamber is good; if the liquid level at the left side of the U-shaped pipe is lower than that at the right side, the test chamber is not sealed, and the mud inhibition effect is filled again until the air tightness of the test chamber meets the requirement;
step two: closing the valve of the common air bottle, opening the valve of the biological cause gas bottle at the right side, and carrying out a mud-effect-restraining sealing and biological cause gas blocking test; meanwhile, an automatic timing module is switched on, and mud effect-restraining sealing and blocking time recording and tail gas component detection of the device are started;
step three: observing the breakdown condition of the Clay effectiveness in the test chamber of the test module, detecting the color change and the liquid level height difference of the fuchsin-sodium chloride mixed solution in the module, and detecting the gas component detection result of the gas detector; when the fuchsin solution begins to fade and the liquid level of the U-shaped pipe has height difference, the mud-restraining effect in the test chamber is broken down by the biogenic gas, the circuit of the automatic timing module in the U-shaped pipe is switched on, the air switch is switched off, the automatic timer stops working, and the test duration is the time for sealing and blocking the biogenic gas by the mud-restraining effect;
step four: closing the valve of the biological cause gas bottle, and opening the valve of the common air bottle again; the biogenic gas in the sealed test module and the fuchsin-sodium chloride mixed solution in the gas detection module respectively flow into a solution containing box and a gas purification box in the gas purification treatment module by adjusting the air pressure, and the gas purification box is used for purifying and treating SO2、H2S/NO and CO;
step five: when SO displayed by the gas detector2、H2Collecting tail gas when the concentration of S, NO and CO is lower than the emission standard; when the collecting ball is full of the tail gas, the tail gas is collected again after the collecting ball is replaced;
step six: CH displayed when gas detector indicates4When the concentration is lower than the safe concentration of the indoor gas, the valves of the common air bottle and the biological cause gas bottle are closed at the same time, the hexagon bolt at the top of the sealed test chamber is unscrewed, and the test chamber is opened to finish the test; changing the effective mixing proportion of the mud and the mudRepeating the steps from one to five according to the thickness of the effective layer and the gas occurrence pressure, and testing the blocking effect of the mud effect on the biogenesis gas sealing under the conditions of different parameters;
step seven: and after the experiment of the mud inhibition effect on the biogenic gas sealing and blocking effect is finished, the external power supply of the automatic timing module and the gas detector is cut off, the valves of the common air bottle and the biogenic gas bottle, the U-shaped tube of the cleaning gas detection module, the solution storage box of the gas purification treatment module and the gas purification box are closed.
The invention has the beneficial effects that:
1. the invention provides a mud effect sealing barrier effect and biological cause gas purification treatment test device and method, wherein a gas collection body generation module, a sealing test module, a gas detection module, an automatic timing module and a purification treatment module are integrated, and a good opportunity is provided for quantitatively evaluating the influence of factors such as mud effect mix proportion, mud effect layer thickness and gas occurrence pressure on the sealing barrier effect and leakage damage mechanism of the gas collection body, and obtaining the mud effect optimal mix proportion and the thickness critical threshold value.
2. The gas generation module provided by the invention is installed by connecting a common air bottle and a biological cause gas bottle in parallel. The common air bottle is helpful for realizing the air tightness inspection of the test device and the purification treatment of residual biogenic gas, the biogenic gas bottle is used for testing the mud effect sealing and blocking effect time, and the gas components in the bottle comprise CH4、SO2、H2S, NO, CO and the like, and the components and the occurrence pressure of the biogenic gas in the shield construction process are simulated to the maximum extent;
3. the sealing test module provided by the invention is internally provided with the transparent test cabin, so that the mud-restraining effect failure and damage process in the test process can be observed conveniently; the inner wall of the cabin body is arc-shaped, and the wall surface is a rough frosted surface, so that the bonding strength between the mud-restraining effect and the inner wall surface is enhanced, and the permeation and diffusion of biogenic gas along the inner wall surface are avoided; the outer wall of the cabin body is provided with scale marks, so that favorable conditions are provided for testing the effective layer thickness of the clayey mud. The permeable stone, the mud inhibition effect, the undisturbed soil sample and the filter screen are sequentially added into the test chamber, and the whole process that biogenic gas gradually permeates, permeates and diffuses from the stratum around the shield to the mud inhibition effect layer is simulated to the maximum extent.
4. The fuchsin-sodium chloride mixed solution is contained in the U-shaped tube of the gas detection module. When the mud effect sealing effect is good, the liquid levels on the left side and the right side of the U-shaped pipe are level, and the magenta solution is bright red; when the mud-restraining effect sealing fails, liquid level difference occurs on the liquid level at the left side and the right side of the U-shaped pipe, and the fuchsin solution can be mixed with SO in the biogenic gas2The reaction produces a discoloration phenomenon. The gas detection module comprehensively adopts various means of physical liquid level and chemical reaction to comprehensively represent the critical state of the sealing failure of the mud-restraining effect, the phenomenon is very obvious in the test process, and operators can conveniently observe and record in time. In addition, the sodium chloride solution in the U-shaped pipe can obviously enhance the conductivity of the solution, and creates favorable conditions for the short circuit of the automatic timer and the termination of the test time in time;
5. the automatic timing module provided by the invention adopts an automatic timer and is connected with a circuit port in parallel, the lower end of the circuit is arranged below the liquid level of fuchsin-sodium chloride, and the upper end of the circuit is arranged slightly above the liquid level of the fuchsin-sodium chloride. When the mud-restraining effect is broken down, liquid level difference appears on two sides of the U-shaped pipe under the action of air pressure, two ends of a circuit port are soaked by fuchsin-sodium chloride solution, the circuit port is communicated, an automatic timer stops timing due to short circuit, and automatic and accurate recording of the gas time of the mud-restraining effect sealing and blocking biological cause is achieved.
6. The purification treatment module provided by the invention can collect fuchsin-sodium chloride mixed solution from the gas detection module by using the solution storage box, and the gas purification box respectively adopts slaked lime, activated carbon fiber and R-J20 molecular sieve adsorbent to purify SO2、H2S/NO and CO. When the gas concentration is higher than the emission standard, the tail gas valve is in a closed state, and the gas returns to the input end of the solution storage box through the return pipe and is purified again. When the gas concentration is lower than the emission standard, a safety valve connected with the collecting ball is opened, and tail gas directly enters the collecting ball. When the collecting ball is full of the tail gas, the safety valve is closed, and the collecting ball is replaced in time; the purification treatment module reasonably controls the gas concentration by designing a gas detector, a tail gas collecting ball and a return pipeAnd the safe and orderly test process is ensured within the range of emission standards.
Drawings
FIG. 1 is a schematic diagram of a basic structure of a mud effect sealing and blocking effect and gas purification treatment test device;
FIG. 2 is a schematic diagram of a gas generation module for a Clay seal barrier effect and gas cleaning process test;
FIG. 3 is a schematic diagram of a sealing test module for a Clay Effect sealing and blocking effect and gas purification treatment test;
FIG. 4 is a schematic diagram of a gas detection module for a Clay Effect seal blocking effect and gas purification treatment test;
FIG. 5 is a schematic diagram of an automatic timing module for a Clay sealing barrier effect and gas cleaning process test;
FIG. 6 is a schematic diagram of a cleaning treatment module for a Clay sealing barrier effect and gas cleaning treatment test;
in the figure: the device comprises a gas generation module 1, a sealing test module 2, a gas detection module 3, an automatic timing module 4, a purification treatment module 5, a common air bottle 6, a biogenesis gas bottle 7, a test chamber 8, permeable stones 9, a mud effect 10, an undisturbed soil sample 11, a filter screen 12, a fuchsin-sodium chloride mixed solution 13, a solution storage box 14, a gas purification box 15, a return pipe 16, a tail gas collection ball 17, a pneumatic valve 18, a gas pipe 19, a gas meter 20, a cover plate 21, a gas pipe 22, a hexagon bolt 23, a rubber sealing ring 24, a hollow cylinder 25, a top plate 26, a gas guide hole 27, a U-shaped pipe 28, an exhaust pipe 29, an automatic timer 30, a protective resistor R, a circuit port 31, an air switch S1, a one-way valve 32, an electronic three-way valve 33, a gas detector 34, a safety valve 35, a partition plate 36, a filter screen 37, slaked lime 38, activated carbon fiber 39 and an R-J20 molecular sieve adsorbent 40.
Detailed Description
For a better understanding of the present invention, reference is made to the following detailed description taken in conjunction with the accompanying drawings. The content of the invention is not limited to this at all.
Examples
As shown in fig. 1, a mud-effect-inhibiting sealing effect and biogenic gas purification treatment test device specifically includes a gas generation module 1, a sealing test module 2, a gas detection module 3, an automatic timing module 4 and a purification treatment module 5.
1. Gas generating module 1
The gas generation module 1 is formed by connecting a common air bottle 6 and a biological cause gas bottle 7 through a tee joint, and the outlets of the two gas bottles are provided with a gas pressure valve 18. The outlet of the tee is connected to the upper end of the test chamber 8 through an input pipe 19, and a barometer 20 is arranged on the pipeline. The gas component in the biogenic gas bottle comprises CH4、SO2、H2S, NO, CO, etc.
2. Seal test module 2
The sealing test module 2 comprises a hollow cylinder 25 in which the test chamber 8 is arranged, the upper end of which is sealed by a top plate 26; the upper end of the test chamber 8 is connected to an air pipe 19 of the gas generation module 1, and the bottom of the test chamber is sequentially provided with a permeable stone 9, a mud inhibition effect 10, an undisturbed soil sample 11 and a filter screen 12 from bottom to top. The filter screen 12 is arranged on the surface of the undisturbed soil sample 11, so that the undesirable phenomena of dust raising and the like under the action of air flow can be avoided.
The cover plate 21 and the top plate 26 are hermetically connected with the test cabin through the hexagon bolts 23; a rubber sealing ring 24 is arranged between the top plate 26 and the cover plate 21 to enhance the sealing effect.
The outer walls of the hollow cylinder 25 and the test chamber 8 are made of transparent materials, and the materials are preferably acrylic materials, so that the failure and damage process of the clay effect can be conveniently observed.
The outer wall of the test chamber 8 is in a smooth broken line shape, and the wall surface is a rough frosted surface, so that the bonding strength between the mud inhibition effect and the inner wall surface is enhanced, and the biogenic gas is prevented from permeating and diffusing along the inner wall surface; the outer wall surface is provided with the scale mark, can provide the advantage for the test gram mud effect layer thickness.
The bottom of the test chamber 8 is provided with an air guide hole 27.
3. Gas detection module 3
The gas detection module 3 is a U-shaped pipe 28 containing a conductance detection liquid, the top end of the pipe is sealed, one end of the pipe body is connected to a gas guide hole 27 at the bottom end of the test chamber through a gas guide pipe 22, and the other end of the pipe body is connected to the purification treatment module 5.
The electric conduction detection liquid is fuchsin-sodium chloride mixed solution, wherein the fuchsin solution can be mixed with SO in the biogenic gas2The reaction produces discoloration and sodium chloride can enhance the conductivity of the solution.
4. Automatic timing module 4
The automatic timing module 4 is formed by connecting a timer 30, an air switch, a power supply and a protective resistor in series to form a loop, and then the timer 30 is electrically connected with detection liquid in the U-shaped pipe 28 to form parallel connection. When the mud effect prevention air tightness is good, a branch connected with the U-shaped pipe 28 is disconnected, the automatic timer is in a working state, and the mud effect prevention sealing and biological cause gas blocking time is recorded in real time; when the mud inhibition effect is failed and damaged, the liquid level of the conductivity detection liquid on one side of the automatic timing module in the U-shaped pipe rises, so that a branch circuit connected with the U-shaped pipe is communicated, the protection resistor in the passage is a low-resistance resistor, the current is larger after the circuit is communicated, the switch trips and is automatically disconnected after the circuit reaches the air switch threshold value, the automatic timer is in a circuit breaking state, the recording is suspended, and the reading of the tripping time is the time of the mud inhibition effect sealing and biological cause gas blocking.
5. Purification treatment module 5
The purification treatment module 5 comprises a solution storage box 14 and a gas purification box 15, wherein a rear end conduit of the gas purification box 15 is connected with a tail gas collection ball 17, and a gas detector 34 and a safety valve 35 are arranged between the tail gas collection ball and the tail gas collection ball. The solution receiver 14 is connected to the gas purification cartridge 15 and is separated by a partition 36 and a screen 37. The solution storage tank 14 is connected to the gas detection module 3 through an exhaust pipe 29; the air inlet end of the solution containing box 14 is communicated with the air outlet end of the air purifying box 15 through a return pipe 16. The gas purification box 15 comprises three chambers, wherein the three chambers are sequentially filled with hydrated lime 38, activated carbon fiber 39 and R-J20 molecular sieve adsorbent 40 along the gas flow direction, SO that SO can be sufficiently absorbed2、H2S/NO, CO, and the like.
The inlet end of the solution holding cassette 14 is provided with a one-way valve 32. An electronic three-way valve 33 is arranged at the outlet end of the gas purification box 15, and the electronic three-way valve 33 is respectively communicated with the return pipe 16 and a conduit connected with the tail gas collecting ball 17. When the gas concentration detected by the gas detector 34 is higher than the discharge standard, the electronic three-way valve 33 closes the input end on the side of the exhaust gas collecting ball 17, opens the output end on the side of the return pipe 16, and the gas returns to the input end of the solution storage box 14 through the return pipe 16 to be purified again. When the gas concentration detected by the gas detector 34 is lower than the emission standard, the safety valve 35 connected to the exhaust gas collecting ball 17 is opened, and the exhaust gas directly enters the collecting ball 17. When the collecting ball 17 is full of the tail gas, the safety valve 35 is closed, and the collecting ball 17 is replaced in time; the gas detector 34 is electrically connected with the electronic three-way valve 33 through a control unit, and is combined with the tail gas collecting ball 17 and the return pipe 16 to reasonably control the gas concentration within the range of the emission standard, so that the safe and orderly operation of the test process is ensured.
The invention also discloses a test method for the sealing and blocking effect of the mud inhibition effect and the gas purification treatment, which specifically comprises the following steps:
step S1: the gas generating module 1, the sealing test module 2, the gas detection module 3, the automatic timing module 4 and the purification treatment module 5 are connected in sequence. A permeable stone 9, a mud effect 10, an undisturbed soil sample 11 and a filter screen 12 are respectively added into a test chamber 8 from bottom to top in sequence, a proper amount of fuchsin-sodium chloride mixed solution 12 is added into a U-shaped pipe 28, and slaked lime 38, activated carbon fiber 39 and an R-J20 molecular sieve adsorbent 40 are added into a gas purification box 15 from left to right in sequence.
Step S2: and opening the left common air bottle valve, closing the right biological cause air bottle valve, introducing common air into the test chamber 8, and checking the air tightness of the test chamber by observing the liquid level change in the U-shaped tube 28 of the gas detection module. If the liquid levels on the two sides of the U-shaped pipe 28 are kept unchanged, the air tightness of the test chamber is good; if the liquid level on the left side of the U-shaped tube 28 is lower than on the right side, the test chamber 8 is not sealed yet. At this point, the gram-positive 10 should be refilled until the air tightness of the test chamber 8 meets the requirement.
And step S3: and closing the left common air bottle valve, opening the right biological cause air bottle valve, and performing a mud-restraining effect sealing and biological cause gas blocking test. Meanwhile, the external power supply of the automatic timing module 3 of the testing device and the gas detector 34 is turned on, and mud effect sealing and blocking time recording and tail gas component detection of the device are started.
And step S4: and observing the breakdown condition of the Clay effect in the test chamber of the test module, detecting the color change and the liquid level difference of the fuchsin-sodium chloride mixed solution 13 in the test module, and detecting the gas component detection result of the gas detector 34. When the fuchsin solution begins to fade and the liquid level of the U-shaped pipe has a height difference, the mud-restraining effect 10 in the test chamber is broken down by the biogenic gas, the circuit port 31 on the right side of the U-shaped pipe is communicated, the automatic timer 30 stops working, and the test duration is the time for sealing and blocking the biogenic gas by the mud-restraining effect.
Step S5: the valve of the biological cause gas cylinder is closed, and the valve of the common air cylinder is opened again. The biogenic gas in the sealed test module and the fuchsin-sodium chloride mixed solution 13 in the gas detection module respectively flow into a solution containing box 13 and a gas purification box 14 in the gas purification treatment module by adjusting a gas pressure valve, and SO is purified by adopting slaked lime 38, activated carbon fiber 39 and R-J20 molecular sieve adsorbent 40 respectively2、H2S/NO and CO.
Step S6: when the gas detector 34 indicates SO2、H2When the concentration of S, NO and CO gases is below the emission standard, the gas valve associated with the collection ball will be opened and the exhaust will pass directly into the collection ball 16. When the collecting ball is full of the tail gas, the safety valve is closed, and the collecting ball 16 is replaced in time.
Step S7: CH displayed when gas detector indicates4When the concentration is lower than the indoor gas safety concentration, the valves of the common air bottle and the biogenesis gas bottle are closed simultaneously, the hexagonal bolt 23 at the top of the sealed test chamber is unscrewed to open the test chamber 8, the mud-restraining effect layers with different thicknesses and mixing ratios are adopted to repeat the steps, and the mud-restraining effect on the biogenesis gas sealing separation effect under different parameter conditions is tested.
Step S8: after the test of the mud effect on the biogenic gas sealing and blocking effect is finished, the external power supply of the automatic timing module 4 and the gas detector 34 is cut off, the valves of the common air bottle and the biogenic gas bottle are closed, and the U-shaped tube 28 of the cleaning gas detection module, the solution storage box 13 of the gas purification treatment module and the gas purification box 14 are cleaned.
The invention provides a mud effect sealing and blocking effect and gas purification treatment test device and method, wherein a gas generating module, a sealing test module, a gas detection module, an automatic timing module and a purification treatment module are integrated, and the problem that the mud effect sealing and blocking effect and gas purification treatment test device and method are lacked in the prior art is solved. Meanwhile, the test device and the method can realize the purification treatment of the test gas, utilize the gas adsorbent and the tail gas collecting ball to treat the test gas, ensure that the concentration of the test gas is in the range of emission standard by installing a gas detector, and greatly reduce the harm to the tester and the surrounding environment.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any modification, equivalent replacement, and improvement made by those skilled in the art within the technical scope of the present invention should be included in the scope of the present invention.
Claims (9)
1. A testing device for sealing and blocking effect and gas treatment and purification treatment of mud effect is characterized by comprising a gas generation module, a sealing test module, a gas detection module, an automatic timing module and a purification treatment module;
the sealing test module comprises a hollow cylinder, wherein a test chamber is arranged in the hollow cylinder, and the upper end of the hollow cylinder is sealed by a top plate; the upper end of the test chamber is connected to a gas pipe of the gas generation module, and the bottom of the test chamber is sequentially provided with a permeable stone, a mud inhibition effect, an undisturbed soil sample and a filter screen from bottom to top;
the gas detection module is a U-shaped pipe containing a conductivity detection liquid, the top end of the gas detection module is sealed, one end of the pipe body is connected to the bottom end of the test chamber, and the other end of the pipe body is connected to the purification treatment module;
the automatic timing module is arranged on one side of the outlet of the U-shaped pipe, and the normal/rising of the liquid level of the detection liquid caused by the air pressure change enables a short circuit in the automatic timing module to be switched off/on so as to realize normal/stop timing;
the purification treatment module comprises a solution storage box and a gas purification box, a conduit at the rear end of the gas purification box is connected with a tail gas collection ball, and a gas detector is arranged between the tail gas collection ball and the gas purification box.
2. The testing device according to claim 1, wherein the gas generation module is formed by connecting a common air bottle and a biogenic gas bottle through a tee joint.
3. The testing device of claim 1, wherein the hollow cylinder and the outer wall of the test chamber are made of transparent material.
4. A test rig as claimed in claim 1, wherein the outer wall of the test chamber is in the form of a smooth dogleg.
5. The testing device according to claim 1, wherein the liquid containing the electrical conductivity detector is a magenta solution containing an electrolyte.
6. The testing apparatus of claim 1, wherein the solution storage cassette is connected to the gas purification cassette and separated by a partition and a screen; the solution storage box is connected to the gas detection module through an exhaust pipe; the air inlet end of the solution storage box is communicated to the air outlet end of the gas purification box through a return pipe; the gas outlet end of the gas purification box is provided with an electronic three-way valve, and the electronic three-way valve 33 is communicated with a return pipe 16 and a conduit connected with an exhaust gas collecting ball 17 respectively.
7. The test device of claim 6, wherein: the gas purification box comprises three chambers, wherein the three chambers are sequentially filled with hydrated lime, activated carbon fiber and an R-J20 molecular sieve adsorbent along the gas flowing direction.
8. The test device according to claim 1, wherein the automatic timing module is formed by connecting a timer, an air switch, a power supply and a low-resistance resistor in series to form a loop, and then electrically connecting the timer and the detection liquid in the U-shaped tube to form parallel connection.
9. The method for testing a Clay seal Barrier Effect and gas treatment clean-up process plant according to any one of claims 1 to 8, comprising the steps of:
the method comprises the following steps: opening a valve of a common air bottle, closing a valve of a biological cause air bottle, introducing air into the test chamber, and checking the air tightness of the test chamber by observing the liquid level change in the U-shaped pipe of the gas detection module; if the liquid levels on the two sides of the U-shaped pipe are kept unchanged, the air tightness of the test chamber is good; if the liquid level at the left side of the U-shaped pipe is lower than that at the right side, the test chamber is not sealed, and the mud inhibition effect is filled again until the air tightness of the test chamber meets the requirement;
step two: closing the valve of the common air bottle, opening the valve of the biological cause gas bottle at the right side, and carrying out a mud-effect-restraining sealing and biological cause gas blocking test; meanwhile, an automatic timing module is switched on, and mud effect sealing blocking time recording and tail gas component detection of the device are started;
step three: observing the breakdown condition of the Clay effectiveness in the test chamber of the test module, detecting the color change and the liquid level height difference of the fuchsin-sodium chloride mixed solution in the module, and detecting the gas component detection result of the gas detector; when the fuchsin solution begins to fade and the liquid level of the U-shaped pipe has a height difference, the mud-restraining effect in the test chamber is broken down by the biogenic gas, the circuit of the automatic timing module in the U-shaped pipe is switched on, the air switch is switched off, the automatic timer stops working, and the test duration is the time for sealing and blocking the biogenic gas by the mud-restraining effect;
step four: closing the valve of the biogenic air bottle, and opening the valve of the common air bottle again; the biogenic gas in the sealed test module and the fuchsin-sodium chloride mixed solution in the gas detection module respectively flow into a solution containing box and a gas purification box in the gas purification treatment module by adjusting the air pressure, and the gas purification box is used for purifying and treating SO2、H2S/NO and CO;
step five: when SO displayed by the gas detector2、H2Collecting tail gas when the concentration of S, NO and CO is lower than the emission standard; when the collecting ball is full of the tail gas, the tail gas is collected again after the collecting ball is replaced;
step six: CH displayed when gas detector indicates4When the concentration is lower than the safe concentration of the indoor gas, the valves of the common air bottle and the biological cause gas bottle are closed at the same time, the hexagon bolt at the top of the sealed test chamber is unscrewed, and the test chamber is opened to finish the test; changing the mixing proportion of the gram-weight effect, the thickness of the gram-weight effect layer and the gas occurrence pressure, repeating the steps from one to five, and testing the sealing and blocking effect of the gram-weight effect on the biogenic gas under the conditions of different parameters;
step seven: after the test of the mud effect on the biogenic gas sealing and blocking effect is finished, the external power supply of the automatic timing module and the gas detector is cut off, the valve of the common air bottle and the biogenic gas bottle, the U-shaped tube of the cleaning gas detection module, and the solution storage box and the gas purification box of the gas purification treatment module are closed.
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