A distributed gas detection alarm system

Abstract

The present invention belongs to the technical field of VOC gas pipeline transportation safety early warning, and specifically relates to a distributed gas detection and alarm system, including a controller, a VOC waste gas main pipe and a plurality of waste gas branch pipes, each waste gas branch pipe is installed between a workshop exhaust port and the VOC waste gas main pipe, and different workshops discharge the same or different VOC waste gases; the middle of the waste gas branch pipe is connected with an industrial nitrogen pipeline; compared with the prior art, the advantages and positive effects of the present invention are: (1) the present invention can carry out targeted monitoring of different positions of crisscrossing VOC gas pipelines, and issue an audible and visual alarm after a problem is found; (2) corresponding VOC gas concentration detectors are installed before and after the waste gas branch pipes and the interfaces between the waste gas branch pipes and the VOC waste gas main pipe to achieve precise control and early warning; (3) when the VOC waste gas recovery device in the workshop is in an abnormal state, the industrial nitrogen pipeline fills nitrogen into the waste gas branch pipe to reduce the VOC waste gas concentration in the waste gas branch pipe.

Description

Technical Field

[0001] The present invention belongs to the technical field of VOC gas pipeline transportation safety warning, and in particular relates to a distributed gas detection and alarm system. Background Art

[0002] The substances in the pipelines of chemical enterprises are mainly organic chemical raw materials and products. The waste gas pipelines in environmental protection facilities also involve VOCs waste gas. The substances transported by these pipelines are mostly VOC gases. Chemical pipelines, like chemical equipment, are an indispensable part of chemical production equipment. They play the role of connecting equipment with different process functions to complete specific process. In some cases, the pipeline itself can also complete certain chemical processes like chemical equipment, that is, "pipeline production".

[0003] Chemical pipelines are crisscrossed, with a wide variety of pipeline types, the physical and chemical properties of the transported media are diverse, and the pipeline system has many joints, resulting in a high incidence of fire and explosion accidents. Pipeline rupture and explosion accidents are likely to spread along the pipeline system, causing the accident to expand rapidly, so there is an urgent need for a system that can provide safety warnings at different locations of VOC gas transportation pipelines. Summary of the invention

[0004] The present invention provides a distributed gas detection alarm system to solve the technical problems in the prior art, such as the criss-cross layout of chemical pipelines, the various types of pipelines, the diverse physical and chemical properties of the transported media, the many connection points of the pipeline system, and the high incidence of fire and explosion accidents.

[0005] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a distributed gas detection alarm system, including a controller, a VOC exhaust gas main pipe and a plurality of exhaust gas branch pipes, each of the exhaust gas branch pipes is installed between the workshop exhaust port and the VOC exhaust gas main pipe, and different workshops discharge the same or different VOC exhaust gases;

[0006] A gas flow meter 1 and a gas concentration detector 1 are installed on the side of the exhaust gas branch pipe close to the workshop exhaust port. The output ends of the gas flow meter 1 and the gas concentration detector 1 are respectively connected to the controller for communication. When the output value of the gas concentration detector 1 exceeds the set value, the controller controls the sound and light alarm 1 to alarm. The sound and light alarm 1 is installed at the bottom of the exhaust gas branch pipe close to the workshop exhaust port.

[0007] The middle part of the exhaust gas branch pipe is connected with an industrial nitrogen pipeline, and a gas flow meter 2 and a solenoid valve are installed on the side of the industrial nitrogen pipeline close to the exhaust gas branch pipe, and the gas flow meter 2 is closer to the exhaust gas branch pipe; the gas flow meter 2 and the solenoid valve are respectively connected to the controller for communication;

[0008] When the output value of the gas concentration detector on the exhaust branch pipe exceeds the set value, the controller controls the solenoid valve to open, and the nitrogen in the industrial nitrogen pipeline enters the exhaust branch pipe to reduce the VOC exhaust gas concentration in the exhaust branch pipe to below the lower explosion limit concentration.

[0009] Preferably, the controller is capable of controlling the opening of the solenoid valve to adjust the flow rate of nitrogen entering the exhaust branch pipe.

[0010] Preferably, the portion of the exhaust gas branch pipe between the industrial nitrogen pipeline, the interface of the exhaust gas branch pipe and the VOC exhaust gas main pipe is a gas mixing zone; a gas concentration detector 2 is installed in the gas mixing zone, and the output end of the gas concentration detector 2 is communicatively connected to the controller.

[0011] Preferably, the VOC waste gas concentration in the gas mixing interval should not be greater than % of the lower explosion limit concentration; if the VOC waste gas concentration detected by the gas concentration detector 2 is greater than % of the lower explosion limit concentration, the controller controls the solenoid valve to increase the opening; when the solenoid valve opening is at its maximum and the VOC waste gas concentration detected by the gas concentration detector 2 is greater than % of the lower explosion limit concentration, the controller controls the sound and light alarm 2 to sound an alarm, and the sound and light alarm 2 is installed below the gas mixing interval.

[0012] Preferably, a gas concentration detector three and a gas concentration detector four are installed before and after the interface between the gas mixing zone and the VOC exhaust gas main pipe, respectively; the gas concentration detector three and the gas concentration detector four both detect the concentration of specific VOC gas in the VOC exhaust gas main pipe, and the specific VOC gas is the VOC gas flowing in the exhaust gas branch pipe closest to the gas concentration detector three.

[0013] Preferably, the gas concentration detector three and the gas concentration detector four are respectively connected to the controller for communication.

[0014] Preferably, when the concentration of the specific VOC gas detected by the gas concentration detector three is greater than the lower explosion limit concentration of %, the controller controls the sound and light alarm three to alarm, and the sound and light alarm three is installed below the gas concentration detector three; when the concentration of the specific VOC gas detected by the gas concentration detector four is greater than the lower explosion limit concentration of %, the controller controls the sound and light alarm four to alarm, and the sound and light alarm four is installed below the gas concentration detector four.

[0015] Preferably, when the sound and light alarm three and / or the sound and light alarm four sound an alarm, the controller controls the opening of the corresponding solenoid valve to be maximum.

[0016] Preferably, the VOC gas discharged from the exhaust port of the workshop is one of benzene, toluene, xylene, ethylene, propylene, butylene, styrene, trichloroethylene, chloroform, trichloroethane, diisocyanate, diisocyanatolyl, acetaldehyde, formaldehyde, vinyl chloride and phosgene.

[0017] Preferably, when the output value of the gas concentration detector exceeds the set value, the corresponding workshop will overhaul the VOC gas recovery device in the workshop or activate the spare VOC gas recovery device; the VOC gas recovery device includes an activated carbon adsorption tower, a condensation recovery device and a membrane separator.

[0018] Compared with the prior art, the advantages and positive effects of the present invention are:

[0019] (1) The distributed gas detection and alarm system provided by the present invention can conduct targeted monitoring of different locations of crisscrossing VOC gas pipelines, and issue an audible and visual alarm if the VOC gas concentration at a certain location exceeds the standard;

[0020] (2) The present invention utilizes the characteristics that different VOC gases are discharged from the exhaust ports of different workshops, and installs corresponding VOC gas concentration detectors before and after the exhaust branch pipe and the interface between the exhaust branch pipe and the VOC exhaust main pipe to achieve precise control and early warning;

[0021] (3) The middle of the waste gas branch pipe is connected to an industrial nitrogen pipeline; when the VOC waste gas recovery device in the workshop is in an abnormal state, the industrial nitrogen pipeline fills nitrogen into the waste gas branch pipe to reduce the VOC waste gas concentration in the waste gas branch pipe to below the lower explosion limit concentration;

[0022] (4) The controller can control the opening of the solenoid valve to adjust the nitrogen flow entering the exhaust branch pipe;

[0023] (5) Through the distributed gas detection and alarm system of the present invention, chemical enterprise personnel can quickly locate the pipe sections with safety risks, quickly analyze the causes and take corresponding measures. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solution of the embodiment of the present invention, the following is a brief introduction to the drawings required for describing the embodiment:

[0025] Figure 1 Schematic diagram of distributed gas detection and alarm system Figure 1 ;

[0026] Figure 2 Schematic diagram of distributed gas detection and alarm system Figure 2 .

[0027] Description of reference numerals:

[0028] 1—VOC exhaust gas main pipe, 2—gas mixing area, 3—industrial nitrogen pipeline, 4—exhaust gas branch pipe;

[0029] 5—gas flow meter 1, 6—gas flow meter 2, 7—gas concentration detector 1;

[0030] 8—gas concentration detector three, 9—gas concentration detector four, 10—gas concentration detector two;

[0031] 11—Solenoid valve. DETAILED DESCRIPTION

[0032] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is further described below with reference to the accompanying drawings and embodiments.

[0033] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways than those described herein. Therefore, the present invention is not limited to the specific embodiments of the following disclosure.

[0034] Example 1

[0035] Combine the following Figure 1-Figure 2 A distributed gas detection alarm system in Example 1 includes a controller, a VOC exhaust gas main pipe 1 and multiple exhaust gas branch pipes 4. Each exhaust gas branch pipe 4 is installed between the workshop exhaust port and the VOC exhaust gas main pipe 1. Different workshops discharge the same or different VOC exhaust gases.

[0036] like Figure 1 As shown, a gas flow meter 5 and a gas concentration detector 7 are installed on the side of the exhaust branch pipe 4 close to the workshop exhaust port. The output ends of the gas flow meter 5 and the gas concentration detector 7 are respectively connected to the controller for communication. When the output value of the gas concentration detector 7 exceeds the set value, the controller controls the sound and light alarm 1 to alarm. The sound and light alarm 1 is installed at the bottom of the exhaust branch pipe 4 close to the workshop exhaust port.

[0037] like Figure 1 As shown, the middle part of the exhaust gas branch pipe 4 is connected to the industrial nitrogen pipeline 3, and a gas flow meter 6 and a solenoid valve 11 are installed on the side of the industrial nitrogen pipeline 3 close to the exhaust gas branch pipe 4, and the gas flow meter 6 is closer to the exhaust gas branch pipe 4; the gas flow meter 6 and the solenoid valve 11 are respectively connected to the controller for communication.

[0038] like Figure 1 As shown, when the output value of the gas concentration detector 7 on the exhaust branch pipe 4 exceeds the set value, the controller controls the solenoid valve 11 to open, and the nitrogen in the industrial nitrogen pipeline 3 enters the exhaust branch pipe 4 to reduce the VOC exhaust gas concentration in the exhaust branch pipe 4 to below the lower explosion limit concentration.

[0039] The controller can control the opening of the solenoid valve 11 to adjust the flow rate of nitrogen entering the exhaust branch pipe 4 .

[0040] like Figure 1 As shown, the part of the exhaust gas branch pipe 4 between the industrial nitrogen pipeline 3, the interface of the exhaust gas branch pipe 4 and the VOC exhaust gas main pipe 1 is the gas mixing zone 2; the gas mixing zone 2 is installed with a gas concentration detector 10, and the output end of the gas concentration detector 10 is communicatively connected with the controller.

[0041] The VOC waste gas concentration in the gas mixing interval 2 should not be greater than 25% of the lower explosion limit concentration; if the VOC waste gas concentration detected by the gas concentration detector 10 is greater than 25% of the lower explosion limit concentration, the controller controls the solenoid valve 11 to increase the opening; when the opening of the solenoid valve 11 is the maximum and the VOC waste gas concentration detected by the gas concentration detector 10 is greater than 25% of the lower explosion limit concentration, the controller controls the sound and light alarm 2 to sound an alarm, and the sound and light alarm 2 is installed below the gas mixing interval 2.

[0042] like Figure 1 As shown, a gas concentration detector 3 8 and a gas concentration detector 4 9 are installed before and after the interface between the gas mixing zone 2 and the VOC exhaust gas main pipe 1 respectively; the gas concentration detector 3 8 and the gas concentration detector 4 9 both detect the concentration of specific VOC gas in the VOC exhaust gas main pipe 1, and the specific VOC gas is the VOC gas flowing in the exhaust gas branch pipe 4 closest to the gas concentration detector 3 8.

[0043] The gas concentration detector three 8 and the gas concentration detector four 9 are respectively connected to the controller for communication.

[0044] When the concentration of the specific VOC gas detected by the gas concentration detector three 8 is greater than 25% of the lower explosion limit concentration, the controller controls the sound and light alarm three to sound an alarm, and the sound and light alarm three is installed below the gas concentration detector three 8; when the concentration of the specific VOC gas detected by the gas concentration detector four 9 is greater than 25% of the lower explosion limit concentration, the controller controls the sound and light alarm four to sound an alarm, and the sound and light alarm four is installed below the gas concentration detector four 9.

[0045] When the sound and light alarm three and / or the sound and light alarm four sound an alarm, the controller controls the opening of the corresponding solenoid valve 11 to be maximum.

[0046] The VOC gas discharged from the workshop exhaust port is one of benzene, toluene, xylene, ethylene, propylene, butylene, styrene, trichloroethylene, chloroform, trichloroethane, diisocyanate, diisocyanatolyl, acetaldehyde, formaldehyde, vinyl chloride, and phosgene.

[0047] When the output value of the gas concentration detector 7 exceeds the set value, the corresponding workshop will overhaul the VOC gas recovery device in the workshop or activate the spare VOC gas recovery device; the VOC gas recovery device includes an activated carbon adsorption tower, a condensation recovery device and a membrane separator.

[0048] The workshop exhaust port in this embodiment discharges formaldehyde, the workshop is a naphthalene-based water reducer production workshop, and the VOC gas recovery device in the workshop is an activated carbon adsorption tower.

[0049] Gas concentration detector one 7, gas concentration detector three 8, gas concentration detector four 9 and gas concentration detector two 10 are all formaldehyde concentration detectors.

[0050] Example 2

[0051] The difference between this embodiment and embodiment 1 is that the workshop in this embodiment is a paint production workshop or a spraying workshop, the VOC gas discharged from the exhaust port of the workshop is toluene, and the VOC gas recovery device in the workshop is a condensation recovery device.

[0052] Gas concentration detector one 7, gas concentration detector three 8, gas concentration detector four 9 and gas concentration detector two 10 are all toluene concentration detectors.

[0053] The above description is only a preferred embodiment of the present invention and does not limit the present invention in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes for application in other fields. However, any simple modification or equivalent change made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A distributed gas detection alarm system, characterized in that: It comprises a controller, a VOC waste gas main pipe (1) and a plurality of waste gas branch pipes (4), each of the waste gas branch pipes (4) being installed between a workshop exhaust port and the VOC waste gas main pipe (1), and different workshops discharge the same VOC waste gas; A gas flow meter (5) and a gas concentration detector (7) are installed on the side of the exhaust gas branch pipe (4) close to the workshop exhaust port. The output ends of the gas flow meter (5) and the gas concentration detector (7) are respectively connected to the controller for communication. When the output value of the gas concentration detector (7) exceeds the set value, the controller controls the sound and light alarm (1) to sound an alarm. The sound and light alarm (1) is installed at the bottom of the exhaust gas branch pipe (4) close to the workshop exhaust port. The middle part of the waste gas branch pipe (4) is connected to an industrial nitrogen pipeline (3); a gas flow meter (6) and a solenoid valve (11) are installed on the side of the industrial nitrogen pipeline (3) close to the waste gas branch pipe (4), and the gas flow meter (6) is closer to the waste gas branch pipe (4); the gas flow meter (6) and the solenoid valve (11) are respectively connected to the controller for communication; When the output value of the gas concentration detector 1 (7) on the waste gas branch pipe (4) exceeds the set value, the controller controls the solenoid valve (11) to open, and the nitrogen in the industrial nitrogen pipeline (3) enters the waste gas branch pipe (4) to reduce the VOC waste gas concentration in the waste gas branch pipe (4) to below the lower explosion limit concentration; the controller can control the opening size of the solenoid valve (11) to adjust the nitrogen flow entering the waste gas branch pipe (4); The portion of the waste gas branch pipe (4) between the industrial nitrogen pipeline (3), the interface of the waste gas branch pipe (4) and the VOC waste gas main pipe (1) is the gas mixing zone (2); a gas concentration detector three (8) and a gas concentration detector four (9) are respectively installed before and after the interface between the gas mixing zone (2) and the VOC waste gas main pipe (1); the gas concentration detector three (8) and the gas concentration detector four (9) both detect the concentration of a specific VOC gas in the VOC waste gas main pipe (1), and the specific VOC gas is the VOC gas flowing in the waste gas branch pipe (4) closest to the gas concentration detector three (8); The gas concentration detector three (8) and the gas concentration detector four (9) are respectively connected to the controller for communication; When the concentration of the specific VOC gas detected by the gas concentration detector three (8) is greater than 25% of the lower explosion limit concentration, the controller controls the sound and light alarm three to give an alarm, and the sound and light alarm three is installed below the gas concentration detector three (8); when the concentration of the specific VOC gas detected by the gas concentration detector four (9) is greater than 25% of the lower explosion limit concentration, the controller controls the sound and light alarm four to give an alarm, and the sound and light alarm four is installed below the gas concentration detector four (9); When the sound and light alarm three and / or the sound and light alarm four sound an alarm, the controller controls the corresponding solenoid valve (11) to have a maximum opening.

2. The distributed gas detection alarm system according to claim 1, characterized in that: The gas mixing zone (2) is equipped with a second gas concentration detector (10), and the output end of the second gas concentration detector (10) is communicatively connected with the controller.

3. The distributed gas detection alarm system according to claim 2 is characterized in that: The VOC waste gas concentration in the gas mixing zone (2) should not be greater than 25% of the lower explosion limit concentration; if the VOC waste gas concentration detected by the gas concentration detector (10) is greater than 25% of the lower explosion limit concentration, the controller controls the solenoid valve (11) to increase its opening; when the solenoid valve (11) is at its maximum opening and the VOC waste gas concentration detected by the gas concentration detector (10) is greater than 25% of the lower explosion limit concentration, the controller controls the sound and light alarm (2) to sound an alarm, and the sound and light alarm (2) is installed below the gas mixing zone (2).

4. The distributed gas detection alarm system according to claim 1, characterized in that: The VOC gas discharged from the exhaust port of the workshop is one of benzene, toluene, xylene, ethylene, propylene, butylene, styrene, trichloroethylene, chloroform, trichloroethane, diisocyanate, diisocyanatolyl, acetaldehyde, formaldehyde, vinyl chloride, and phosgene.

5. The distributed gas detection alarm system according to claim 1, characterized in that: When the output value of the gas concentration detector 1 (7) exceeds the set value, the corresponding workshop will overhaul the VOC gas recovery device in the workshop or activate the spare VOC gas recovery device; the VOC gas recovery device includes an activated carbon adsorption tower, a condensation recovery device and a membrane separator.

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