CN213397288U

CN213397288U - Gas extraction flow loop verification device

Info

Publication number: CN213397288U
Application number: CN202022293361.3U
Authority: CN
Inventors: 蒋志龙; 武福生; 孙小进; 高文平; 汪雪君; 邹付军
Original assignee: Tiandi Changzhou Automation Co Ltd; Changzhou Research Institute of China Coal Technology and Engineering Group Corp
Current assignee: Tiandi Changzhou Automation Co Ltd; Changzhou Research Institute of China Coal Technology and Engineering Group Corp
Priority date: 2020-10-14
Filing date: 2020-10-14
Publication date: 2021-06-08
Anticipated expiration: 2030-10-14

Abstract

The utility model relates to a gas drainage flow circuit verification device, including driving system, pressure regulating system, temperature stabilizing system, standard table group and detection station, driving system, pressure regulating system, temperature stabilizing system, standard table group and detection station establish ties in proper order through the pressure circuit and form inclosed ring device. The gas extraction flow loop verification device is high in measurement accuracy and automation degree, flow values and accumulated quantity value errors of a detected meter are compared, and errors of a gas extraction flow sensor in actual measurement are solved.

Description

Gas extraction flow loop verification device

The technical field is as follows:

the utility model relates to an industrial and mining equipment technical field especially relates to a gas drainage flow circuit verification device.

Background art:

the coal mine gas extraction pipeline monitoring system needs to measure the gas extraction quantity of each main pipe, each branch pipe and each evaluation unit, wherein the measured value of the gas flow is key data. The measurement accuracy of the gas extraction flow sensor directly influences the judgment of the gas extraction effect.

At present, the measurement and detection of a gas extraction flow sensor are mainly divided into two types: 1, measuring by adopting a mode of setting a standard wind speed in an annular wind tunnel, wherein the measurement precision of a sensor in a negative pressure state cannot be measured in the annular wind tunnel under a normal pressure state; the gas extraction flow sensor based on the 2-differential pressure principle adopts a given differential pressure value, and judges whether the flow value is qualified or not by checking the differential pressure measurement value of the sensor, and cannot judge whether the flow value is qualified or not.

The utility model has the following contents:

to the problem, the utility model provides a simulation actual pressure environment's gas is taken out and is adopted flowmeter degree of accuracy circuit and verify device adopts the positive displacement flowmeter of high accuracy as the standard table, and the pressure circuit can carry out pressure regulation, compares the error of examined the table under different pressure conditions and between the standard table.

The utility model discloses a realize through following technical scheme:

the utility model provides a gas drainage flow circuit verifying attachment, includes driving system, pressure regulating system, temperature stabilizing system, standard table group and detection station, driving system, pressure regulating system, temperature stabilizing system, standard table group and detection station establish ties in proper order through the pressure circuit and form inclosed ring device.

Preferably, the power system comprises a closed fan, a variable frequency motor, a frequency converter and a filter, wherein the filter and the closed fan are sequentially arranged on the pressure loop, the frequency converter is connected with the variable frequency motor, and the variable frequency motor is connected with the closed fan.

Preferably, the pressure regulating system includes a pressurizing system and a pressure reducing system, the pressurizing system includes an air compressor, a dry cooling machine, a steam-water separator, a buffer tank and a regulating valve which are connected in sequence, the regulating valve is arranged on the pressure loop, the pressure reducing system includes a vacuum pump, a one-way valve and a regulating valve which are connected in sequence, and the regulating valve is arranged on the pressure loop.

In order to ensure the safety, a pressure sensor and a pressure relief valve are further arranged on a pressure loop of the pressure regulating system.

Preferably, the temperature stabilizing system comprises a water-cooled heat exchange pipe, a circulating pump, a cooling tower, a water tank, a water inlet temperature sensor and a water outlet temperature sensor, the water-cooled heat exchange pipe is arranged on the pressure loop, the water inlet temperature sensor and the water outlet temperature sensor are respectively arranged at the water inlet end and the water outlet end of the water-cooled heat exchange pipe, and the cooling tower is respectively connected with the water-cooled heat exchange pipe through the circulating pump and the water tank.

Preferably, the standard meter group comprises a plurality of groups of volume type flow meters arranged in parallel, and each volume type flow meter comprises a front selector valve, a roots type flow meter and a rear selector valve which are sequentially connected.

Preferably, the detection station comprises a plurality of test pipe sections which are arranged in parallel, and the test pipe comprises a front selector valve, a temperature sensor, a pressure sensor, a universal mounting seat and a rear selector valve which are sequentially arranged.

The utility model has the advantages that: the gas extraction flow loop verification device is high in measurement accuracy and automation degree, flow values and accumulated quantity value errors of a detected meter are compared, and errors of a gas extraction flow sensor in actual measurement are solved.

Description of the drawings:

fig. 1 is the utility model discloses a gas drainage flow circuit verification device's schematic structure diagram.

Detailed Description

The following detailed description of the preferred embodiments of the present invention will be provided in conjunction with the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, and the protection scope of the present invention can be clearly and clearly defined.

The gas extraction flow loop verification device shown in fig. 1 comprises a power system 2, a pressure regulating system 3, a temperature stabilizing system 4, a standard meter set 5 and a detection station 6, wherein the power system 2, the pressure regulating system 3, the temperature stabilizing system 4, the standard meter set 5 and the detection station 6 are sequentially connected in series through a pressure loop 1 to form a closed loop device.

The closed pressure loop 1 is made of 304 stainless steel materials, and the diameter of the loop is DN 200. The loop is a closed annular device formed by connecting equipment such as a power system 2, a pressure regulating system 3, a temperature stabilizing system 4, a standard meter group 5, a detection station 6 and the like in series.

The power system 2 mainly comprises a closed fan 201, a variable frequency motor 202, a frequency converter 203 and a filter 204. The system realizes high-precision regulation and control of air quantity through frequency conversion. The filter 204 prevents foreign substances from entering the enclosed fan 201. The maximum flow of the power system of the device is 2800m³/h。

The pressure regulating system 3 realizes pressure control regulation of 20-500 Kpa of absolute pressure in the closed loop, and the system is mainly provided with an air compressor 301, a dry cooling machine 302, a steam-water separator 303, a buffer tank 304 and a regulating valve 305 to realize a pressurization function. The vacuum pump 311, the check valve 312, and the regulating valve 313 realize a pressure reduction function. Meanwhile, a pressure sensor 306, a pressure relief valve 307 and the like are provided. The system achieves automatic regulation of the loop pressure by means of a pressure sensor 306, a pressure relief valve 307 and corresponding pressure increase or decrease.

The temperature stabilizing system 4 mainly comprises a water-cooled heat and cold exchange pipe 401, a circulating pump 402, a cooling tower 403, a water tank 404, an inlet water temperature sensor 405 and an outlet water temperature sensor 406. The temperature of the gas in the pipeline is increased due to the fact that the temperature of the shell, the fan blades and other parts of the fan can be increased when the fan runs for a long time. The heat of the gas in the loop is exchanged into the circulating water through the water-cooled heat and cold exchange tube 401, the circulating pump 402 lifts the hot water in the water-cooled heat and cold exchange tube 401 to the cooling tower 403 for cooling and returns to the water tank 404, and the cold water in the water tank 404 enters the water-cooled heat and cold exchange tube 401 again to realize circulating cooling.

The standard meter group 5 adopts a volume flow meter as a standard meter, and the flow range of the volume flow meter is limited so as to meet the requirements of the device 2800m³And the flow rate requirement per hour is that 3 (1#, 2#, 3#) G650 flow meters are adopted, and 1G 40 flow meter is additionally arranged for small flow rate test. The standard meter group 5 mainly includes a 1# roots type flow meter 501, a 1-1# front selector valve 502, a 1-2# rear selector valve 503, a 2# roots type flow meter 511, a 2-1# front selector valve 512, a 2-2# rear selector valve 513, a 3# roots type flow meter 521, a 3-1# front selector valve 522, a 3-2# rear selector valve 523, a 4# roots type flow meter 531, a 4-1# front selector valve 532 and a 4-2# rear selector valve 533. The system selects a corresponding number of criteria tables based on the set flow value.

The test station 6 adopts three test tube sections, and the sizes of the three test tube sections are DN100, DN200 and DN300 respectively. The coal mine gas extraction flow sensor adopts an insertion type installation mode at present, 1 universal installation seat is installed at the test position of each test pipe section, and various insertion type sensors can be directly installed on the test pipe sections through the adapter. The test station mainly comprises a DN100 test pipe section 601, a universal mounting seat 602, a pressure sensor 603, a temperature sensor 604, a DN100 front selection valve 605 and a DN100 rear selection valve 606, a DN200 test pipe section 611, a universal mounting seat 612, a pressure sensor 613, a temperature sensor 614, a DN200 front selection valve 615 and a DN200 rear selection valve 616, a DN300 test pipe section 621, a universal mounting seat 622, a pressure sensor 623, a temperature sensor 624, a DN300 front selection valve 625 and a DN300 rear selection valve 626. And during field test, the upper section of the corresponding test pipe is selected according to the specification of the tested meter, and the front and rear selection valves are opened.

Dynamic process:

installing the detected meter at a mounting seat of a detection pipe section with a corresponding specification and manually opening a front selection valve and a rear selection valve of the detection pipe section; setting a working pressure value of the pressure loop by the upper computer and starting a pressure regulating system, wherein the pressure regulating system operates and judges whether the pressure regulating system is in a positive pressure or negative pressure working mode according to the set value, and starting corresponding equipment (a vacuum pump or an air compressor) to regulate the loop pressure to a set value state; the upper computer starts a temperature control system, gas heat in the loop is exchanged into a circulating water pipeline through the water-cooled heat-cold exchange pipe 401, hot water in the water-cooled heat-cold exchange pipe 401 is lifted to the cooling tower 403 by the circulating pump 402 to be cooled and returns to the water tank 404, and cold water in the water tank 404 enters the water-cooled heat-cold exchange pipe 401 again to realize circulating cooling; setting an air quantity value on the upper computer, starting

variable frequency controls

202 and 203, and quickly entering a standard air quantity state by a power system through PID (proportion integration differentiation) regulation control; the accumulated quantity is reset and data recording is started simultaneously by the detected meter and the standard meter group 5, and the system collects and records the instantaneous flow, the accumulated quantity and the like of the detected meter and the standard meter in real time; the pressure regulating system actually monitors the pressure change in the loop and regulates the pressure in the loop in the running process of the system; the device can test the measurement error between the standard meter and the meter to be detected under different pressure environments, and improves the accuracy of the meter to be detected.

In addition, in the description of the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," "disposed," "provided," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Finally, it should be noted that: the above embodiments are only specific embodiments of the present invention, and are not intended to limit the technical solution of the present invention, and the protection scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: those skilled in the art can still modify or easily conceive of changes in the technical solutions described in the foregoing embodiments or make equivalent substitutions for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. The utility model provides a gas drainage flow circuit verifying attachment which characterized in that: including driving system, pressure regulating system, temperature stabilizing system, standard table group and detection station, driving system, pressure regulating system, temperature stabilizing system, standard table group and detection station establish ties in proper order through the pressure loop and form inclosed ring gear.

2. The gas extraction flow loop verification device according to claim 1, characterized in that: the power system comprises a closed fan, a variable frequency motor, a frequency converter and a filter, wherein the filter and the closed fan are sequentially arranged on the pressure loop, the frequency converter is connected with the variable frequency motor, and the variable frequency motor is connected with the closed fan.

3. The gas extraction flow loop verification device according to claim 2, characterized in that: the pressure regulating system includes turbocharging system and pressure reducing system, turbocharging system is including the air compressor machine, the dry cooling machine, catch water, buffer tank and the governing valve that connect gradually, the governing valve sets up on the pressure ring way, pressure reducing system is including vacuum pump, check valve and the governing valve that connects gradually, the governing valve sets up on the pressure ring way.

4. The gas extraction flow loop verification device according to claim 3, characterized in that: and a pressure sensor and a pressure relief valve are also arranged on the pressure loop of the pressure regulating system.

5. The gas extraction flow loop verification device according to claim 3, characterized in that: the temperature stabilizing system comprises a water-cooled heat exchange pipe, a circulating pump, a cooling tower, a water tank, a water inlet temperature sensor and a water outlet temperature sensor, wherein the water-cooled heat exchange pipe is arranged on the pressure loop, the water inlet temperature sensor and the water outlet temperature sensor are respectively arranged at the water inlet end and the water outlet end of the water-cooled heat exchange pipe, and the cooling tower is respectively connected with the water-cooled heat exchange pipe through the circulating pump and the water tank.

6. The gas extraction flow loop verification device according to claim 5, characterized in that: the standard meter group comprises a plurality of groups of volume type flow meters which are arranged in parallel, and the volume type flow meters comprise a front selector valve, a Roots type flow meter and a rear selector valve which are connected in sequence.

7. The gas extraction flow loop verification device according to claim 6, characterized in that: the detection station comprises a plurality of test pipe sections which are arranged in parallel, and each test pipe section comprises a front selector valve, a temperature sensor, a pressure sensor, a universal mounting seat and a rear selector valve which are sequentially arranged.