Rapid fusing type gas detector

Abstract

The invention discloses a rapid fusing type gas detector which comprises a liquefied petroleum gas tank body and a sampling pipeline connected with a detected gas pipeline, the sampling pipeline is sequentially connected with a water-gas filter, a dust filter and an electric pump, and an outlet of the electric pump is connected with a detected gas flowmeter; the liquefied petroleum gas tank body is connected with a combustible gas flow meter, the detection gas flow meter and the combustible gas flow meter are connected with a flame arrester, the flame arrester is connected with a mixed gas pipeline, the mixed gas pipeline is connected with a reaction tank, an ignition needle is arranged in the reaction tank, the ignition needle is connected with an igniter, and a quick exhaust port is formed in the lateral lower part of the reaction tank. The rapid fusing type gas detector solves the problems of large detection error, high input cost, low detection speed, low detection precision, complex structure and high maintenance cost in the existing mixed gas detection.

Description

Technical Field

[0001] The invention belongs to the technical field of gas detection and relates to a fast-fuse gas detector. Background Art

[0002] In the environmental protection industry, the technology for detecting waste gas concentration is becoming more and more mature. The basic principles of instruments for detecting waste gas on the market include infrared detection, catalytic combustion detection, FTA, etc. Infrared detection is suitable for detecting single gas conditions, but has a large error for multi-component waste gas, and cannot fully play a role in safety protection in actual use; the catalytic combustion detection method is suitable for most waste gas detection conditions, with a relatively long response time, requiring oxygen in the sample gas, and low cost, but the catalyst in the instrument is easily poisoned, causing detection failure; the fastest and most accurate detection instrument is CIC's FTA concentration detector, which is most widely used in coal mine gas and petrochemical industries, but it is expensive, requires a large investment, and has a high maintenance cost. It is particularly difficult for environmental protection equipment manufacturers to choose safe, effective, and low-cost concentration detectors for production equipment with low waste gas concentrations, or owners who want to use environmental protection equipment to treat waste gas to prevent concentration increases and explosion accidents. Summary of the invention

[0003] The purpose of the present invention is to provide a fast-fuse gas detector to solve the problems of large error, high investment cost, slow detection speed, low detection accuracy, complex structure and high maintenance cost in existing mixed gas detection.

[0004] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a fast-fuse gas detector, including a liquefied petroleum gas tank body, a sampling pipeline connected to the gas pipeline to be tested, the sampling pipeline is connected to a water vapor filter, a dust filter and an electric pump in sequence, and the outlet of the electric pump is connected to a detection gas flow meter; the liquefied petroleum gas tank body is connected to a combustible gas flow meter, the detection gas flow meter and the combustible gas flow meter are connected to a flame arrester, the flame arrester is connected to a mixed gas pipeline, the mixed gas pipeline is connected to a reaction tank, an ignition needle is arranged in the reaction tank, the ignition needle is connected to the igniter, and a quick exhaust port is arranged on the lower side of the reaction tank.

[0005] As a preferred technical solution of the present invention, a pressure sensor is provided on the reaction tank.

[0006] As a preferred technical solution of the present invention, a safety valve is provided on the top of the reaction tank.

[0007] As a preferred technical solution of the present invention, a thermal resistor is provided at the bottom of the reaction tank.

[0008] As a preferred technical solution of the present invention, the liquefied petroleum gas tank is arranged on a guide rail.

[0009] As a preferred technical solution of the present invention, the dust filter includes a primary dust filter and a secondary dust filter.

[0010] The beneficial effects of the present invention are as follows: the present invention is a fast-fuse gas detector, which can detect the concentration of a variety of mixed gases, has a wide adaptability range, can cope with complex working conditions, has high safety, fast response speed, and has good market promotion and application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0012] Figure 1 It is a structural schematic diagram of the fast-fuse gas detector of the present invention.

[0013] In the figure: 1. reaction tank, 2. high-pressure igniter, 3. ignition needle, 4. quick exhaust port, 5. pressure sensor, 6. safety valve, 7. thermal resistor, 8. mixed gas pipeline, 9. flame arrester, 10. detection gas flow meter, 11. combustible gas flow meter, 12. electric pump, 13. gas-water filter, 14. primary dust filter, 15. secondary dust filter, 16. measured gas pipeline, 17. combustible gas, 18. guide rail, 19. pressure taking pipeline. DETAILED DESCRIPTION

[0014] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0015] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0016] Example 1

[0017] like Figure 1As shown, the fast-blow gas detector of the present invention comprises a liquefied petroleum gas tank body 17, a sampling pipe 19 connected to a gas pipeline 16 to be tested, the sampling pipe 19 is sequentially connected to a water vapor filter 13, a primary dust filter 14, a secondary dust filter 15 and an electric pump 12, the outlet of the electric pump 12 is connected to a detection gas flow meter 10; the liquefied petroleum gas tank body 17 is connected to a combustible gas flow meter 11, the detection gas flow meter 10 and the combustible gas flow meter 11 are connected to a flame arrester 9, the flame arrester 9 is connected to a mixed gas pipeline 8, the mixed gas pipeline 8 is connected to a reaction tank 1, an ignition needle 3 is arranged in the reaction tank 1, the ignition needle 3 is connected to an igniter 2, a quick exhaust port 4 is arranged at the lower side of the reaction tank 1, and a pressure sensor 5 and a safety valve 6 are arranged at the top of the reaction tank 1.

[0018] The sampling pipeline 19 is connected to the gas pipeline 16 to be measured. When connected, it is necessary to take the middle position of the gas pipeline 16 to ensure accurate sampling, which is beneficial to subsequent detection and interlocking.

[0019] The gas-water filter 13, the primary dust filter 14, and the secondary dust filter 15 have the same principle as the conventional pre-treatment equipment, and their main purpose is to remove water vapor, dust with larger molecules, etc. from the measured gas.

[0020] The electric pump 12 is used to extract the pre-treated gas and send it into the reaction tank 1. When selecting the model, it needs to match the volume of the reaction tank 1. The 30L / min large-flow sampling electric pump selected in this invention meets the rapidity of the invention.

[0021] The detection gas flow meter 10 is used to monitor the gas flow extracted and delivered by the electric pump 12. The two are interlocked. When the current flow value of the detection gas flow meter 10 is lower than the set value, the system stops detection and outputs an alarm to protect system safety.

[0022] The combustible gas stored in the liquefied petroleum gas tank 17 is liquefied petroleum gas. The liquefied petroleum gas tank is equipped with a pressure reducing device, and the pressure after pressure reduction is 3KPA; the liquefied petroleum gas tank 17 and the combustible gas flow meter 11 are interlocked with each other. When the combustible gas flow is detected to be higher or lower than the set value, the system stops detecting and outputs an alarm to protect the system safety.

[0023] The detection gas is mixed with the combustible gas and enters the flame arrester 9. When the gas explodes, a flame will be generated. The flame arrester 9 can prevent the flame from spreading into the liquefied petroleum gas cylinder or into the owner's exhaust pipe, causing an explosion accident.

[0024] When designing the reaction tank 1, the residence time of the gas needs to be taken into consideration. The smaller the volume of the reaction tank, the less gas is filled into the tank and the shorter the residence time of the gas. The pressure rating of the reaction tank is designed to be 2MPA, which is sufficient to withstand the pressure generated by a gas explosion.

[0025] The pressure sensor 5 is arranged on the reaction tank 1 to detect the pressure of the gas when the combustion reaction occurs in the reaction tank 1. When it is detected that the current pressure value in the reaction tank 1 exceeds the set pressure value, the detection system will quickly feed back to the control system to interlock the corresponding valve to make a switching action.

[0026] The safety valve 6 is a special safety valve that can release pressure to prevent the medium pressure in the pipeline or equipment from exceeding the specified value. It is installed on the top of the reaction tank 1. When the pressure in the reaction tank 1 rises to exceed the specified value, the gas is discharged to the upper part of the reaction tank 1 to protect the safety of the instruments and meters inside the reaction tank.

[0027] The quick exhaust port 4 is arranged on the side of the reaction tank 1 near the bottom. The gas in the reaction tank 1 is quickly discharged from the quick exhaust port 4 after combustion. The gas is continuously filled into the reaction tank 1 and is also quickly discharged after combustion, which can ensure the rapidity and accuracy of subsequent detection, thereby reducing cumulative errors.

[0028] The principle of the igniter 2 is to boost the AC220V power supply voltage to a power supply voltage of 15KV, which is used to provide a high-voltage power supply to the ignition needle 3.

[0029] The ignition needle 3 is arranged at the bottom of the reaction tank, and the insertion depth does not exceed 1 / 3 of the tank body. A suitable distance is set from the mixed gas pipeline 8 to ensure that the combustion reaction can occur quickly after the mixed gas enters the reaction tank 1.

[0030] Compared with the prior art, the fast-fuse gas detector of the present invention has the following advantages:

[0031] (1) The present invention removes dust and water vapor in the gas to be tested through a pretreatment system; the two gas paths calculate the flow rates of the two gas paths in advance according to the law of partial pressure, and adjust the gas flow rates to 25% of the lower explosion limit of the mixed gas respectively. One path is the pretreated gas to be tested sucked in by a large flow pump, and the other path is the decompressed combustible gas automatically filled in. After the two gases are mixed, they enter the flame arrester for full mixing and then enter the reaction tank. The reaction tank is provided with a long-burning flame device. The gas burns and reacts in the flame. The pressure change generated when the gas burns is detected to determine whether the gas concentration is close to 25% of the lower explosion limit of the gas. After entering the reaction tank for combustion, a bang will be generated, and the pressure value will increase instantly. The collected pressure value is fed back to the control system to determine whether the gas concentration is close to 25% of the lower explosion limit of the gas. If it is close, the control system will quickly make an interlocking action to simplify the gas detection process and ensure system safety.

[0032] (2) The long-lasting flame of the present invention adopts a high-voltage discharge mode for continuous discharge, and presents a free flame state during discharge. The setting of the long-lasting flame can make the gas in the reaction tank burn and react quickly, and has a simple structure, which solves the common problem of slow LEL response time.

[0033] (3) The gas flow of the present invention can be monitored, which is conducive to more accurate adjustment of the combustible gas and the measured gas. When the flow is abnormal or the gas path is blocked, the gas flow can also be fed back to the control system of the environmental protection equipment in a timely manner to ensure system safety.

[0034] (4) The present invention can detect the concentration of a variety of mixed gases, has a wide range of adaptability, and can cope with complex working conditions. When it is detected that the current pressure value in the reaction tank exceeds the set pressure value, the detection system will quickly feed back to the control system to interlock the corresponding valve to make a switching action.

[0035] (5) The present invention adopts an integrated touch screen controller with high integration, which can intuitively display important parameters such as gas flow, temperature, pressure, etc., and is more user-friendly than the traditional LEL interface.

[0036] (6) The present invention has high safety, which is mainly reflected in: 1) the setting of the safety valve can release the high-pressure gas in the reaction tank; 2) the pump and the flow meter are interlocked to prevent the electric pump from being damaged and causing the gas path to be blocked; 3) the combustible gas and the flow meter are interlocked to prevent the combustible gas leakage from causing accidents; 4) the pressure sensor adopts a 2-out-of-1 method to prevent one of the pressure sensors from failing, causing data deviation and false alarm; 5) a quick exhaust structure is set to prevent the gas from accumulating in the reaction tank for a long time.

[0037] (7) The present invention has a fast response speed, which is mainly reflected in: 1) exhaust gas pump suction time: 30L / min 1 second = 0.5L, the reaction tank can be filled in 0.6 seconds; 2) pressure sensor response time: 1 / 30 second = 0.03 second; 3) high-voltage igniter response time: the long flame response time can be ignored.

[0038] Example 2

[0039] like Figure 1 As shown, different from Example 1, in the fast-blow gas detector of the present invention, the thermistor 7 is arranged on the bottom of the reaction tank 1 to detect the temperature in the reaction tank. When the gas in the reaction tank continues to burn and generates heat changes, the thermistor will feed back the temperature signal to the control system, and the control system can make different interlocking actions according to the temperature changes.

[0040] Example 3 like Figure 1As shown, the rest is the same as the above embodiment, and the difference from the above embodiment is that in the fast-fuse gas detector of the present invention, the liquefied petroleum gas tank body 17 is fixed on the guide rail 18 to prevent the liquefied petroleum gas cylinder from tipping over.

[0042] The above description shows and describes several preferred embodiments of the invention, but as mentioned above, it should be understood that the invention is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the invention concept described herein through the above teachings or the technology or knowledge of the relevant field. Changes and modifications made by those skilled in the art should be within the scope of protection of the claims attached to the invention without departing from the spirit and scope of the invention.

Claims

1. Fast-blow gas detector, characterized in that: The invention comprises a liquefied petroleum gas tank body (17), a sampling pipeline (19) connected to a gas pipeline (16) to be tested, the sampling pipeline (19) being connected to a water filter (13), a dust filter and an electric pump (12) in sequence, the outlet of the electric pump (12) being connected to a detection gas flow meter (10); the liquefied petroleum gas tank body (17) being connected to a combustible gas flow meter (11), the detection gas flow meter (10) and the combustible gas flow meter (11) being connected to a flame arrester (9), the flame arrester (9) being connected to a mixed gas pipeline (8), the mixed gas pipeline (8) being connected to a reaction tank (1), an ignition needle (3) being arranged in the reaction tank (1), the ignition needle (3) being connected to an igniter (2), and a quick exhaust port (4) being arranged at the lower side of the reaction tank (1).

2. The fast-blow gas detector according to claim 1, characterized in that: A pressure sensor (5) is provided on the top of the reaction tank (1).

3. The fast-blow gas detector according to claim 2, characterized in that: A safety valve (6) is provided on the top of the reaction tank (1).

4. The fast-blow gas detector according to claim 3, characterized in that: A thermal resistor (7) is provided at the bottom of the reaction tank (1).

5. The fast-blow gas detector according to claim 4, characterized in that: The liquefied petroleum gas tank body (17) is arranged on a guide rail (18).

6. The fast-blow gas detector according to claim 5, characterized in that: The dust filter comprises a primary dust filter (14) and a secondary dust filter (15).

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