Anti-explosion integrated natural gas calorific value regulating and controlling device

Abstract

The utility model relates to an anti-explosion integrated natural gas calorific value regulating and controlling device which comprises a follow-up gas source unit, a gas mixing unit and an equipment skid body. The follow-up air source unit comprises an anti-explosion integrated air compressor, an air buffer tank, a first-stage high-efficiency filter, an anti-explosion drying machine, a second-stage high-efficiency filter and a third-stage high-efficiency filter which are sequentially connected through pipelines; the gas mixing unit comprises an emergency cut-off valve, a pressure stabilizer, a flow meter, a regulating valve, an air inlet ball valve, a check valve and a high-precision static mixer which are connected in sequence; and the follow-up gas source unit and the gas mixing unit are integrated on the equipment skid body. The device adopts an integrated modular design, reduces site construction, facilitates upgrading and reconstruction of a natural gas transmission and distribution station, and has the advantages of high safety, compact structure, small size and convenience in maintenance.

Description

Technical Field

[0001] The utility model relates to the field of natural gas transmission and distribution and natural gas calorific value regulation, and in particular to an explosion-proof integrated natural gas calorific value regulation device. Background Art

[0002] At present, my country's natural gas billing method still adopts volume billing due to gas source conditions, historical evolution, equipment technology level and other reasons. Although the national standard stipulates the calorific value of natural gas (34MJ), in actual market operations, most gas operating companies do not consider calorific value fluctuations and directly adopt volume billing. Natural gas billing according to calorific value will inevitably become the trend of future gas trade settlement. Some industrial users are very sensitive to changes in physical and chemical properties such as natural gas calorific value, such as TV glass shells, precision ceramics, some electronic components and food companies. The fluctuation of parameters such as calorific value directly affects product quality. Therefore, some users build natural gas calorific value control devices in their own factories. However, at present, when reducing high calorific value natural gas to the calorific value required by the state, the control method adopted is to increase the mode of ordinary air compressors and dryers. This equipment is non-explosion-proof equipment and needs to find a space in the non-explosion-proof area of ​​the station to meet the design and use requirements. This increases the site cost of the station and increases the difficulty of equipment construction. At the same time, the station operators are required to operate and maintain the equipment in both the explosion-proof area and the non-explosion-proof area, which increases the personnel intensity. Now we urgently need a way to solve the above pain points. This method can be used in existing explosion-proof areas, while reducing the site requirements and the intensity of personnel operations. Utility Model Content

[0003] The purpose of the utility model is to overcome the shortcomings of the prior art and provide an explosion-proof integrated natural gas calorific value control device that is convenient for upgrading and transforming natural gas transmission and distribution stations, has a small size, high mixing accuracy, and is safe and reliable.

[0004] The utility model solves the technical problem through the following technical solutions:

[0005] An explosion-proof integrated natural gas calorific value control device, characterized in that it comprises a follow-up gas source unit, a gas mixing unit and an equipment skid, wherein the components of the follow-up gas source unit and the components of the gas mixing unit are explosion-proof components;

[0006] The follow-up air source unit includes an explosion-proof integrated air compressor, an air buffer tank, a high-efficiency filter, and an explosion-proof dryer; there are three high-efficiency filters, namely a first-stage high-efficiency filter for oil filtration, a second-stage high-efficiency filter for water filtration, and a third-stage high-efficiency filter for dust impurity transition; the air outlet end of the explosion-proof integrated air compressor is connected to the air inlet end of the air buffer tank through a pipeline, the air outlet end of the air buffer tank is connected to the air inlet end of the first-stage high-efficiency filter, the air outlet end of the first-stage high-efficiency filter is connected to the air inlet end of the explosion-proof dryer through a pipeline, the air outlet end of the explosion-proof dryer is connected to the air inlet end of the second-stage high-efficiency filter through a pipeline, and the air outlet end of the second-stage high-efficiency filter is connected to the air inlet end of the third-stage high-efficiency filter;

[0007] The gas mixing unit comprises an emergency shut-off valve, a pressure stabilizer, a pressure gauge, a flow meter, a regulating valve, an air inlet ball valve, a check valve, and a high-precision static mixer; the emergency shut-off valve, the pressure stabilizer, the flow meter, the regulating valve, the air inlet ball valve, and the check valve are sequentially connected in series through pipelines; the pressure gauge is installed on the connecting pipeline between the pressure stabilizer and the flow meter; the air inlet end of the emergency shut-off valve is connected to the air outlet end of the third high-efficiency filter through a pipeline, the air outlet end of the check valve is connected to the air inlet end of the high-precision static mixer, the gas inlet end of the high-precision static mixer is connected to a gas input pipeline, and a gas inlet valve is installed on the gas input pipeline; the mixer outlet of the high-precision static mixer is connected to a mixed gas output pipeline, and a mixer outlet valve is installed on the mixed gas output pipeline;

[0008] The follow-up gas source unit and the gas mixing unit are integrated on the equipment skid.

[0009] Moreover, the follow-up air source unit also includes an automatic drain valve, and there are four automatic drain valves, including a first automatic drain valve, a second automatic drain valve, a third automatic drain valve, and a fourth automatic drain valve. The four drain valves are respectively connected to the bottom of the air buffer tank, the first-stage high-efficiency filter, the second-stage high-efficiency filter, and the third-stage high-efficiency filter.

[0010] Moreover, the automatic drain valve adopts a mechanical float automatic drain valve.

[0011] Moreover, the emergency shut-off valve and the regulating valve both adopt pneumatic valve bodies.

[0012] Moreover, the flow meter adopts an intelligent flow meter with high-frequency signal output.

[0013] Moreover, the high-precision static mixer adopts an SV type high-precision static mixer.

[0014] Moreover, the gas inlet valve and the mixer outlet valve are both ball valves.

[0015] The advantages and positive effects of the utility model are:

[0016] 1. The explosion-proof integrated natural gas calorific value control device of the utility model centrally installs all components of the follow-up gas source unit and the gas mixing unit on a device skid, adopts an integrated modular design, reduces on-site construction, and facilitates the upgrading and transformation of the natural gas transmission and distribution station. The utility model adopts all explosion-proof components to ensure the safety of the equipment.

[0017] 2. The utility model explosion-proof integrated natural gas calorific value control device adopts a SV type high-precision static mixer in the gas mixing unit, which ensures the mixing accuracy and mixing uniformity of the equipment.

[0018] 3. In addition to meeting the safety requirements of use, the utility model also has the advantages of compact structure, small size and easy maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a system diagram of the utility model explosion-proof integrated natural gas calorific value control device.

[0020] In the figure:

[0021] 1-explosion-proof integrated air compressor, 2-air buffer tank, 3-first stage high-efficiency filter, 4-explosion-proof dryer, 5-second stage high-efficiency filter, 6-third stage high-efficiency filter, 7-emergency shut-off valve, 8-pressure stabilizing valve, 9-pressure gauge, 10-flow meter, 11-regulating valve, 12-air inlet ball valve, 13-check valve, 14-high-precision static mixer, 15-gas inlet ball valve, 16-mixer outlet ball valve, 17-first automatic drain valve, 18-second automatic drain valve, 19-third automatic drain valve, 20-fourth automatic drain valve, 21-equipment skid. DETAILED DESCRIPTION

[0022] The present invention will be further described in detail below through specific embodiments. The following embodiments are merely descriptive and not restrictive, and the protection scope of the present invention cannot be limited by them.

[0023] An explosion-proof integrated natural gas calorific value control device, see Figure 1 The invention point is: it mainly includes a follow-up gas source unit, a gas mixing unit and an equipment skid.

[0024] The follow-up air source unit mainly includes an explosion-proof integrated air compressor 1, an air buffer tank 2, a high-efficiency filter, an explosion-proof dryer 4, and an automatic drain valve. A total of three high-efficiency filters are installed, and according to their functions, they are the first-level high-efficiency filter 3, which mainly filters oil; the second-level high-efficiency filter 5, which mainly filters water; and the third-level high-efficiency filter 6, which mainly filters dust impurities. The automatic drain valve includes a first automatic drain valve, a second automatic drain valve, a third automatic drain valve, and a fourth automatic drain valve. The four drain valves are respectively connected to the bottom of the air buffer tank, the first-level high-efficiency filter, the second-level high-efficiency filter, and the third-level high-efficiency filter. The air outlet end of the explosion-proof integrated air compressor is connected to the air inlet end of the air buffer tank through a pipeline, the air outlet end of the air buffer tank is connected to the air inlet end of the first-stage high-efficiency filter, the air outlet end of the first-stage high-efficiency filter is connected to the air inlet end of the explosion-proof dryer through a pipeline, the air outlet end of the explosion-proof dryer is connected to the air inlet end of the second-stage high-efficiency filter through a pipeline, and the air outlet end of the second-stage high-efficiency filter is connected to the air inlet end of the third-stage high-efficiency filter.

[0025] The gas mixing unit includes an emergency shut-off valve 7, a pressure regulator 8, a pressure gauge 9, a flow meter 10, a regulating valve 11, an air inlet ball valve 12, a check valve 13, a high-precision static mixer 14 and related instruments; the emergency shut-off valve, the pressure regulator, the flow meter, the regulating valve, the air inlet ball valve, and the check valve are sequentially connected in series through pipelines. The pressure gauge is installed on the connecting pipeline between the pressure regulator and the flow meter. The air inlet end of the emergency shut-off valve is connected to the air outlet end of the third high-efficiency filter through a pipeline, the air outlet end of the check valve is connected to the air inlet end of the high-precision static mixer, the gas inlet end of the high-precision static mixer is connected to a gas input pipeline, and a gas inlet valve is installed on the gas input pipeline; the mixer outlet of the high-precision static mixer is connected to a mixed gas output pipeline, and a mixer outlet valve is installed on the mixed gas output pipeline. The gas inlet valve and the mixer outlet valve are preferably ball valves.

[0026] The follow-up gas source unit and the gas mixing unit are integrated on the equipment skid 21 .

[0027] Except for the air compressor and dryer, all other components of the above components are explosion-proof components, which can better meet the use requirements of flammable and explosive places. The high-precision static mixer of the gas mixing unit adopts the SV type high-precision static mixer.

[0028] The emergency shut-off valve 7 and the regulating valve 11 are both pneumatic structures, and the instrument air of this structure uses the air generated by the air compressor of the device itself as the driving air source.

[0029] The flow meter 10 is an intelligent flow meter with high-frequency signal output.

[0030] The above-mentioned explosion-proof integrated air compressor 1 and explosion-proof dryer 4 are independently controlled by an explosion-proof control system without interfering with each other.

[0031] The above automatic drain valve adopts mechanical float ball to drain water automatically, does not need external air source to drive, and the switch is completed independently.

[0032] The working principle of this explosion-proof integrated natural gas calorific value control device:

[0033] The gas inlet and mixed gas outlet of the device are connected to the downstream through pipelines, and the explosion-proof integrated air compressor 1 is turned on. The air first flows into the air buffer tank, passes through the first-stage high-efficiency filter to filter out the oil, and then enters the explosion-proof dryer. After passing through the second-stage high-efficiency filter to filter out the moisture, and after passing through the third-stage high-efficiency filter to filter out the impurities, the gas enters the emergency shut-off valve, which mainly performs the shut-off protection function when a fault occurs downstream, and then enters the voltage stabilizer 8 to stabilize the pressure. The pressure gauge 9 can be observed to see whether the pressure is stable, and then the gas flow rate is observed through the flow meter 10. The gas flow rate is adjusted through the regulating valve 11, and then the air inlet ball valve 12 and the check valve 13 enter the high-precision static mixer 14.

[0034] Natural gas enters the high-precision static mixer 14 through the gas inlet valve 15. After the two gases are mixed, they are transported to the downstream pipeline network through the mixer outlet ball valve 16. Among them, the first automatic drain valve, the second automatic drain valve, the third automatic drain valve, and the fourth automatic drain valve are used to automatically open and drain the moisture in the air when there is water in the valve body.

[0035] Although the embodiments and drawings of the present invention are disclosed for illustrative purposes, those skilled in the art will appreciate that various substitutions, changes and modifications are possible without departing from the spirit of the present invention and the appended claims. Therefore, the scope of the present invention is not limited to the contents disclosed in the embodiments and drawings.

Claims

1. An explosion-proof integrated natural gas calorific value control device, characterized in that: It includes a follow-up gas source unit, a gas mixing unit and an equipment skid, and the components of the follow-up gas source unit and the components of the gas mixing unit are explosion-proof components; The follow-up air source unit includes an explosion-proof integrated air compressor, an air buffer tank, a high-efficiency filter, and an explosion-proof dryer; there are three high-efficiency filters, namely a first-stage high-efficiency filter for oil filtration, a second-stage high-efficiency filter for water filtration, and a third-stage high-efficiency filter for dust impurity transition; the air outlet end of the explosion-proof integrated air compressor is connected to the air inlet end of the air buffer tank through a pipeline, the air outlet end of the air buffer tank is connected to the air inlet end of the first-stage high-efficiency filter, the air outlet end of the first-stage high-efficiency filter is connected to the air inlet end of the explosion-proof dryer through a pipeline, the air outlet end of the explosion-proof dryer is connected to the air inlet end of the second-stage high-efficiency filter through a pipeline, and the air outlet end of the second-stage high-efficiency filter is connected to the air inlet end of the third-stage high-efficiency filter; The gas mixing unit comprises an emergency shut-off valve, a pressure stabilizer, a pressure gauge, a flow meter, a regulating valve, an air inlet ball valve, a check valve, and a high-precision static mixer; the emergency shut-off valve, the pressure stabilizer, the flow meter, the regulating valve, the air inlet ball valve, and the check valve are sequentially connected in series through pipelines; the pressure gauge is installed on the connecting pipeline between the pressure stabilizer and the flow meter; the air inlet end of the emergency shut-off valve is connected to the air outlet end of the third high-efficiency filter through a pipeline, the air outlet end of the check valve is connected to the air inlet end of the high-precision static mixer, the gas inlet end of the high-precision static mixer is connected to a gas input pipeline, and a gas inlet valve is installed on the gas input pipeline; the mixer outlet of the high-precision static mixer is connected to a mixed gas output pipeline, and a mixer outlet valve is installed on the mixed gas output pipeline; The follow-up gas source unit and the gas mixing unit are integrated on the equipment skid.

2. The explosion-proof integrated natural gas calorific value control device according to claim 1, characterized in that: The follow-up air source unit also includes automatic drain valves, and there are four automatic drain valves, including a first automatic drain valve, a second automatic drain valve, a third automatic drain valve, and a fourth automatic drain valve; the four drain valves are respectively connected to the bottom of the air buffer tank, the first-stage high-efficiency filter, the second-stage high-efficiency filter, and the third-stage high-efficiency filter.

3. The explosion-proof integrated natural gas calorific value control device according to claim 2 is characterized in that: The automatic drain valve adopts a mechanical float automatic drain valve.

4. The explosion-proof integrated natural gas calorific value control device according to claim 1, characterized in that: The emergency shut-off valve and the regulating valve both adopt pneumatic valve bodies.

5. The explosion-proof integrated natural gas calorific value control device according to claim 1, characterized in that: The flow meter is an intelligent flow meter with high-frequency signal output.

6. The explosion-proof integrated natural gas calorific value control device according to claim 1, characterized in that: The high-precision static mixer adopts an SV type high-precision static mixer.

7. The explosion-proof integrated natural gas calorific value control device according to claim 1, characterized in that: The gas inlet valve and the mixer outlet valve are both ball valves.

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