Skid-mounted compressed natural gas (CNG) decompression equipment

Abstract

The utility model provides skid-mounted CNG (compressed natural gas) pressure reducing equipment, which is integrally provided with a heat tracing device, a pressure reducing device and a control device and comprises a first gas inlet, a second gas inlet, a third gas inlet and a fourth gas inlet, the second air inlet is used for being connected with an external air source; the first air inlet is connected with an air inlet of the heat tracing device through a first stop valve, and the second air inlet is connected with the air inlet of the heat tracing device through a second stop valve; an outlet of the heat tracing device is connected with an air inlet of the pressure reducing device, the pressure reducing device comprises a first pressure regulating unit, a second pressure regulating unit and a third pressure regulating unit which are sequentially connected, the second pressure regulating unit comprises a first pressure regulating outlet, and the third pressure regulating unit comprises a second pressure regulating outlet. A pressure reducing device, a control device and a heat tracing device are integrated into a pry, and a gas storage device can also be integrated, so that the occupied area of equipment and the investment cost of the equipment are reduced.

Description

Technical Field

[0001] The utility model relates to the field of electronic technology, in particular to a skid-mounted CNG pressure reducing device. Background Art

[0002] In rural areas, the residences are scattered, the gas consumption is small, and the investment in the construction of gas pipelines is large. Therefore, there are certain difficulties in promoting the replacement of coal with natural gas. Compressed natural gas (CNG) has its unique advantages as a gas source for rural areas in the suburban counties of Beijing: First, as a gas source for suburban counties, it has the advantages of small investment and quick results, and is more flexible and has higher economic benefits than pipeline-transported natural gas; Second, the gas sources are of the same type, and the pipelines can be reused, and seamless connection with the municipal gas pipelines can be achieved; Third, it is convenient for users, and the energy utilization is cleaner and more efficient.

[0003] The CNG gas supply method is to compress and store natural gas in a CNG trailer at a CNG filling station in an area with municipal pipeline natural gas, transport it to the CNG pressure reducing gas supply station at the gas supply location, and reduce the compressed natural gas in the CNG trailer to the municipal pipeline pressure through a CNG pressure reducing device and then transport it to the gas using equipment or pipeline.

[0004] According to the demand for small gas consumption in rural areas, it has become an urgent problem to develop a vehicle-mounted small compressed natural gas supply skid-mounted device. Content of the Utility Model

[0005] The utility model aims to provide an intelligent tank monitoring terminal system for a tank truck that overcomes or at least partially solves the above problems.

[0006] To achieve the above object, the technical solution of the utility model is specifically implemented as follows:

[0007] The utility model provides a skid-mounted CNG pressure reducing device, which integrally sets a heat tracing device, a pressure reducing device and a control device, including: a first air inlet and a second air inlet, the first air inlet is used to connect a gas storage device; the second air inlet is used to connect an external gas source; the first air inlet is connected to the air inlet of the heat tracing device through a first cut-off valve, and the second air inlet is connected to the air inlet of the heat tracing device through a second cut-off valve; the outlet of the heat tracing device is connected to the air inlet of the pressure reducing device, the pressure reducing device includes a first pressure regulating unit, a second pressure regulating unit and a third pressure regulating unit connected in sequence, the second pressure regulating unit includes a first pressure regulating outlet, and the third pressure regulating unit includes a second pressure regulating outlet;

[0008] A heat tracing temperature sensor and a heat tracing water level sensor are arranged on the heat tracing device;

[0009] A first pressure sensor and a first temperature sensor are arranged on the air inlet of the pressure reducing device;

[0010] A second pressure sensor, a second temperature sensor and a first flowmeter are provided on the first pressure regulating outlet;

[0011] A third pressure sensor, a third temperature sensor and a second flowmeter are provided on the second pressure regulating outlet;

[0012] The control device is used to control the opening and closing operations of the first cut-off valve and the second cut-off valve;

[0013] The tracing temperature sensor, the tracing water level sensor, the first pressure sensor, the first temperature sensor, the second pressure sensor, the second temperature sensor, the first flowmeter, the third pressure sensor, the third temperature sensor and the second flowmeter respectively send the collected data to the control device;

[0014] The control device is also used to monitor and control according to the obtained collected data.

[0015] Wherein, the second air inlet adopts a flange-type high-pressure air inlet.

[0016] Wherein, the tracing device adopts an electric heating water bath type heat exchanger.

[0017] Wherein, the control device adopts an explosion-proof PLC control cabinet.

[0018] Wherein, a first concentration alarm is installed on the box body of the skid-mounted CNG pressure reducing equipment to link with a forced exhaust device, and through gas concentration alarm, the control device controls the exhaust fan to conduct forced ventilation.

[0019] Wherein, a first explosion-proof video monitoring device is arranged inside the box body of the skid-mounted CNG pressure reducing equipment, and a first hanging temperature-sensitive dry powder fire extinguishing equipment is suspended on the top.

[0020] Wherein, the gas storage is integrally arranged in the skid-mounted CNG pressure reducing equipment, and the gas storage device includes: 2 groups of gas storage units, and each group of gas storage units includes 6 seamless steel cylinders.

[0021] Thus, through the skid-mounted CNG pressure reducing equipment provided by the present utility model, the pressure reducing device, the control device and the tracing device are integrated into a skid, and a gas storage device can also be integrated, reducing the floor area of the equipment and the investment cost of the equipment. Description of the Drawings

[0022] To more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0023] Figure 1 FIG. is a schematic structural diagram of the skid-mounted CNG pressure reduction equipment provided by the embodiment of the present utility model;

[0024] Figure 2 FIG. is a specific structural diagram of the skid-mounted CNG pressure reduction equipment provided by the embodiment of the present utility model. Detailed implementation manners

[0025] The following will describe the exemplary embodiments of the present disclosure in more detail with reference to the drawings. Although the exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present disclosure can be more thoroughly understood and the scope of the present disclosure can be fully conveyed to those skilled in the art.

[0026] Figure 1 FIG. shows a schematic structural diagram of the skid-mounted CNG pressure reduction equipment provided by the embodiment of the present utility model. Refer to Figure 1 , the skid-mounted CNG pressure reduction equipment provided by the embodiment of the present utility model integrally sets a heat tracing device, a pressure reduction device and a control device, including: a first air inlet and a second air inlet. The first air inlet is used to connect to a gas storage device; the second air inlet is used to connect to an external gas source; the first air inlet is connected to the air inlet of the heat tracing device through a first cut-off valve, and the second air inlet is connected to the air inlet of the heat tracing device through a second cut-off valve; the outlet of the heat tracing device is connected to the air inlet of the pressure reduction device. The pressure reduction device includes a first pressure regulating unit, a second pressure regulating unit and a third pressure regulating unit connected in sequence. The second pressure regulating unit includes a first pressure regulating outlet, and the third pressure regulating unit includes a second pressure regulating outlet;

[0027] A heat tracing temperature sensor and a heat tracing water level sensor are arranged on the heat tracing device;

[0028] A first pressure sensor and a first temperature sensor are arranged at the air inlet of the pressure reduction device;

[0029] A second pressure sensor, a second temperature sensor and a first flowmeter are arranged at the first pressure regulating outlet;

[0030] A third pressure sensor, a third temperature sensor and a second flowmeter are arranged at the second pressure regulating outlet;

[0031] The control device is used to control the opening and closing operations of the first cut-off valve and the second cut-off valve;

[0032] The tracing temperature sensor, the tracing water level sensor, the first pressure sensor, the first temperature sensor, the second pressure sensor, the second temperature sensor, the first flowmeter, the third pressure sensor, the third temperature sensor and the second flowmeter respectively send the collected data to the control device;

[0033] The control device is also used for monitoring and controlling according to the acquired collected data.

[0034] Specifically, the skid-mounted CNG pressure reducing equipment provided by the embodiment of the present utility model is unattended, and it is required to be highly integrated and meet the requirements of convenient transportation and on-site hoisting. Therefore, the designed external dimensions of the equipment are 5×2×2.2 m. The maximum gas supply capacity of the equipment is 500 Nm 3 / h. To adapt to the characteristics of small gas consumption in rural areas, the designed flow rate of the skid-mounted CNG pressure reducing equipment is that the single-way gas transmission flow rate is 300 Nm 3 / h, in the form of one open and one standby, and it can reach 500 Nm when both channels are fully open 3 / h.

[0035] Combined with Figure 2 , the skid-mounted CNG pressure reducing equipment provided by the embodiment of the present utility model adopts a three-stage pressure reducing form. Among them, there is 1 medium-pressure outlet (the first pressure regulating outlet) reserved after the second-stage pressure reduction, and the outlet pressure is 0.2 - 0.4 Mpa, and a first flowmeter, a second temperature sensor and a second pressure sensor are installed; there is 1 low-pressure outlet (the second pressure regulating outlet) reserved after the third-stage pressure reduction, and the outlet pressure is 2 - 5 KPa, and a second flowmeter, a third temperature sensor and a third pressure sensor are installed.

[0036] The skid-mounted CNG pressure reducing equipment reserves 2 inlets. One is connected to the attached gas storage device, and the other is externally connected to other gas storage equipment. As an optional implementation manner of the embodiment of the present utility model, the attached gas storage device includes: 2 groups of gas storage units, and each gas storage unit includes 6 seamless steel cylinders. The second inlet adopts a flange-type high-pressure inlet to be externally connected to other gas storage equipment. Specifically, the skid-mounted CNG pressure reducing equipment can be equipped with 2 groups of gas storage units by itself. The gas storage unit is assembled by 6 seamless steel cylinders, and the gas storage capacity of each gas storage unit is 100 standard cubic meters. Each gas storage unit is equipped with a manual valve and a quick-connect interface, and is connected to the skid-mounted box body through a hose, so that each gas storage unit can be independently loaded, unloaded, moved and inflated. Each gas storage unit is equipped with a cut-off valve that can automatically open and close.

[0037] Among them, the skid-mounted CNG pressure reducing equipment is respectively equipped with a first cut-off valve and a second cut-off valve, and can be automatically controlled by the control device to open and close.

[0038] As an alternative embodiment of the present utility model, the skid-mounted CNG pressure reducing equipment may further be provided with a first manual valve and a second manual valve, which can be used separately or in combination with the cut-off valve.

[0039] The skid-mounted CNG pressure reducing equipment adopts a highly integrated skid-mounted method, integrating the heat tracing device and the control device into the CNG skid-mounted equipment. As an alternative embodiment of the present utility model, the heat tracing device adopts an electric heating water bath type heat exchanger. The control device adopts an explosion-proof PLC control cabinet.

[0040] Among them, pressure sensors are installed at the inlet of the skid-mounted CNG pressure reducing equipment, after the second-stage pressure regulation, and after the third-stage pressure regulation respectively to collect and monitor pressure data; the heat tracing device is installed with a heat tracing temperature sensor and a heat tracing water level sensor to collect and monitor temperature and water level data. Flow meters are installed at the first pressure regulation outlet and the second pressure regulation outlet of the skid-mounted CNG pressure reducing equipment to collect flow data. All the above data are summarized into the PLC control cabinet (control device), and the PLC control cabinet monitors and controls the equipment working conditions.

[0041] Specifically, when implemented, the PLC control cabinet installed in the skid-mounted CNG pressure reducing equipment controls the operation of the entire skid-mounted CNG pressure reducing equipment. Under normal operation, the operation parameters of the skid-mounted CNG pressure reducing equipment can be read in the PLC cabinet. When the pressure of each stage is too high, the inlet cut-off valve of the equipment automatically cuts off and automatically opens when the pressure returns to normal. At the same time, when the pressure of each gas storage equipment bottle group is too low, the cut-off valve at the outlet of the bottle group can also automatically cut off, open, and switch the gas supply bottle group. At the same time, the operating pressure, temperature, flow rate, heat tracing water level, and the gas concentration inside the skid-mounted box of the skid-mounted CNG pressure reducing equipment are all monitored by the PLC control cabinet. When the operating parameters exceed the limit, the system will automatically alarm.

[0042] As an alternative embodiment of the present utility model, the box body of the skid-mounted CNG pressure reducing equipment is installed with a first concentration alarm to link with the forced exhaust equipment. Through the gas concentration alarm, the control device controls the exhaust fan to conduct forced ventilation.

[0043] As an alternative embodiment of the present utility model, a first explosion-proof video monitoring device is provided inside the box body of the skid-mounted CNG pressure reducing equipment, and a first hanging temperature-sensitive dry powder fire extinguishing equipment is suspended at the top.

[0044] Specifically, to ensure the safe operation of the equipment, the box body of the skid-mounted CNG pressure reducing equipment is installed with a concentration alarm to link with the forced exhaust equipment. Through the gas concentration alarm, the PLC control cabinet controls the exhaust fan to conduct forced ventilation to ensure the ventilation inside the box body when the gas inside exceeds the safe concentration; in addition, an explosion-proof video monitoring system is equipped inside the box; a temperature-sensitive dry powder fire extinguishing equipment is suspended at the top inside the box.

[0045] Since the on-vehicle small integrated skid-mounted CNG decompression gas supply equipment only has a gas storage unit that can store 200 cubic meters of natural gas, connecting other forms of gas storage equipment externally through the reserved flange-type high-pressure inlet can meet greater gas supply demands.

[0046] As an optional implementation manner of the embodiment of the present utility model, the gas storage is integrally arranged in the skid-mounted CNG decompression equipment, and the gas storage device includes: 2 groups of gas storage units, and each group of gas storage units includes 6 seamless steel cylinders.

[0047] It can be seen that through the skid-mounted CNG decompression equipment provided by the present utility model, the decompression device, the control device, and the heat tracing device are integrated into a skid, and a gas storage device can also be integrated, reducing the floor area of the equipment and the input cost of the equipment.

[0048] The above are only the embodiments of the present application and are not used to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included within the scope of the claims of the present application.

Claims

1. A skid-mounted CNG pressure reducing device, characterized in that, Integrated with a heat tracing device, a pressure reducing device and a control device, including: a first air inlet and a second air inlet, the first air inlet is used to connect to a gas storage device; the second air inlet is used to connect to an external gas source; the first air inlet is connected to the air inlet of the heat tracing device through a first cut-off valve, and the second air inlet is connected to the air inlet of the heat tracing device through a second cut-off valve; the outlet of the heat tracing device is connected to the air inlet of the pressure reducing device, the pressure reducing device includes a first pressure regulating unit, a second pressure regulating unit and a third pressure regulating unit connected in sequence, the second pressure regulating unit includes a first pressure regulating outlet, and the third pressure regulating unit includes a second pressure regulating outlet; A heat tracing temperature sensor and a heat tracing water level sensor are provided on the heat tracing device; A first pressure sensor and a first temperature sensor are provided on the air inlet of the pressure reducing device; A second pressure sensor, a second temperature sensor and a first flow meter are provided on the first pressure regulating outlet; A third pressure sensor, a third temperature sensor and a second flow meter are provided on the second pressure regulating outlet; The control device is used to control the opening and closing operations of the first cut-off valve and the second cut-off valve; The heat tracing temperature sensor, the heat tracing water level sensor, the first pressure sensor, the first temperature sensor, the second pressure sensor, the second temperature sensor, the first flow meter, the third pressure sensor, the third temperature sensor and the second flow meter respectively send the collected data to the control device; The control device is also used to monitor and control according to the obtained collected data.

2. The skid-mounted CNG pressure reducing equipment according to claim 1, characterized in that The second air inlet adopts a flange type high-pressure air inlet.

3. The skid-mounted CNG pressure reduction device according to claim 1, characterized in that, The heat tracing device adopts an electric heating water bath type heat exchanger.

4. The skid-mounted CNG pressure reducing device according to claim 1, wherein, The control device adopts an explosion-proof PLC control cabinet.

5. The skid-mounted CNG pressure reduction device according to claim 1, characterized in that, A first concentration alarm is installed on the box body of the skid-mounted CNG pressure reducing equipment to link with a forced exhaust device. Through gas concentration alarm, the control device controls the exhaust fan to conduct forced ventilation.

6. The skid-mounted CNG pressure reducing equipment according to claim 1, characterized in that A first explosion-proof video monitoring device is arranged inside the box body of the skid-mounted CNG pressure reducing equipment, and a first hanging temperature-sensitive dry powder fire extinguishing equipment is suspended at the top.

7. The skid-mounted CNG pressure reducing device according to claim 1, wherein The gas storage is integrally arranged inside the skid-mounted CNG pressure reducing equipment, and the gas storage device includes: 2 groups of gas storage units, and each group of gas storage units includes 6 seamless steel cylinders.

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