A medium- and high-pressure gasification furnace gas pulse dry recovery and purification system and method

Abstract

The present invention relates to a medium- and high-pressure gasification furnace gas pulse dry recovery and purification system and method, comprising: a medium- and high-pressure gasification furnace, a heat exchange device, a separation device, a dust removal system and a clean gas pipeline network connected in sequence, the dust removal system comprising: a low-pressure pulse bag dust collector and a pressure-reduced clean gas back-injection system, the low-pressure pulse bag dust collector is used to filter and purify the dust-containing gas into a dust content of 5mg / m 3 The following clean gas, the pressure-reducing clean gas back-injection system is used to reduce the gas pressure in the low-pressure pulse bag dust collector and then perform filter bag pulse dust removal. The pressure-reducing clean gas back-injection system includes: a high-pressure clean gas pressure relief system, a release clean gas recovery and pressurization system, a high-pressure gas storage tank, and a clean gas injection gas source pipeline with a pulse valve. The advantages of the present invention are: it overcomes the technical difficulty of medium and high pressure gas that cannot be cleaned by pulse, solves the problem of difficulty in dry recovery of medium and high pressure gasification furnace gas, and meets the requirements of energy conservation, emission reduction and environmental protection policies.

Description

Technical Field

[0001] The present invention belongs to the technical field of high-pressure vaporizer coal gas recovery and purification, and more specifically, relates to a pulse dry recovery and purification system and method in medium- and high-pressure vaporizer coal gas by using a pulse bag dust collector. Background Art

[0002] With the rise of the coal chemical industry, medium and high pressure coal gasification furnaces have been widely promoted for their unique advantages. New problems have arisen. The pulse cleaning technology successfully applied to the dry recovery process of low pressure coal gasification furnace gas can no longer be used in medium and high pressure coal gasification furnaces. Therefore, the gas recovery and purification process of medium and high pressure coal gasification furnaces has regressed to the process of 1990, that is, the wet process or electrostatic precipitator process. However, there are the following problems in the above gas purification processes. The first is that the water consumption in the production process increases greatly, the second is that the energy depletion is serious, and the third is that the environmental pollution is serious. Therefore, how to find new ways to reduce the energy and water consumption in the production process of such industries, thoroughly eradicate environmental pollution, and make it meet the current strategic requirements of circular economy, energy conservation and emission reduction, and clean production has become one of the major issues in the development of the industry. Summary of the invention

[0003] In view of the above problems, the purpose of the present invention is to provide a medium- and high-pressure vaporizer gas pulse dry recovery and purification system and method, which is used to solve the problem that when the medium- and high-pressure vaporizer gas adopts a bag-type recovery and purification process, pulse cleaning cannot be achieved because the gas pressure is much higher than the working pressure allowed by the pulse valve. The dry recovery and purification of the medium- and high-pressure vaporizer gas can overcome the above-mentioned deficiencies of the prior art.

[0004] The medium- and high-pressure gasification furnace gas pulse dry recovery and purification system provided by the present invention comprises: a medium- and high-pressure gasification furnace, a heat exchange device, a separation device, a dust removal system and a clean gas pipeline network connected in sequence. The improvement made is that the dust removal system comprises: a low-pressure pulse bag dust collector and a pressure-reduced clean gas back-injection system. The low-pressure pulse bag dust collector is used to filter and purify the dust-containing gas into a dust content of 5 mg / m 3The following clean coal gas, the depressurized clean coal gas back-injection system is used to reduce the gas pressure in the low-pressure pulse bag dust collector and then perform filter bag pulse dust removal, the inlet valve of the low-pressure pulse bag dust collector is connected to the separation equipment, the outlet valve of the low-pressure pulse bag dust collector is connected to the clean coal gas pipeline network, the low-pressure pulse bag dust collector is additionally provided with a pressure relief valve, the depressurized clean coal gas back-injection system includes: a high-pressure clean coal gas pressure relief system, a released clean coal gas recovery pressurization system, a high-pressure coal gas storage tank, and a clean coal gas spray with a pulse valve The blowing air source pipeline, the inlet end of the high-pressure clean coal gas pressure relief system is connected to the pressure relief valve of the low-pressure pulse bag dust collector, the outlet valve end of the high-pressure clean coal gas pressure relief system is connected to the inlet valve end of the released clean coal gas recovery and pressurization system, the outlet valve end of the released clean coal gas recovery and pressurization system is connected to the inlet valve end of the high-pressure coal gas storage tank, the outlet valve end of the high-pressure coal gas storage tank is connected to the clean coal gas pipeline network, the clean coal gas blowing air source pipeline is connected to the clean coal gas pipeline network, and the pulse valve uses the clean coal gas in the clean coal gas pipeline network as the pulse blowing air source.

[0005] As a preferred embodiment of the present invention, the high-pressure clean gas pressure relief system includes: a pressure relief adapter tank, a clean gas pressure relief pipeline connecting the pressure relief adapter tank and the low-pressure pulse bag dust collector recovery pressure relief valve, and a pressure alarm located on the clean gas pressure relief pipeline.

[0006] As a preferred embodiment of the present invention, the released clean coal gas recovery and pressurization system includes: at least one natural gas booster, a first pipeline connecting the inlet end of the natural gas booster and the outlet valve end of the pressure relief adapter tank, and a second pipeline connecting the outlet end of the natural gas booster and the inlet valve end of the high-pressure gas storage tank.

[0007] As a preferred embodiment of the present invention, the clean coal gas injection gas source pipeline, the low-pressure pulse bag dust collector, the first pipeline and the second pipeline are all provided with pressure alarms.

[0008] Another object of the present invention is to provide a pulse dry recovery and purification method for medium and high pressure gasifier gas, which specifically comprises the following steps:

[0009] Step S1: using a medium- and high-pressure gasifier to convert coal into coal gas;

[0010] Step S2: using a heat exchange device to heat and cool down the high-temperature dusty coal gas generated by the coal gasification furnace. The temperature of the coal gas after heat exchange by the heat exchange device is about 250°C, wherein the superheated steam generated by the heat exchange device is sent back to the medium and high pressure gasification furnace;

[0011] Step S3: Rough dust removal using separation equipment:

[0012] Step S31: The large dust particles naturally settled down by gravity from the dusty coal gas are cooled and recovered by the ash cooler and then sent to the return system;

[0013] Step S32: the remaining gas is then roughly filtered through the primary cyclone dust collector and the secondary cyclone dust collector, and the filtered dust is sent to the return system through the pneumatic conveying system;

[0014] Step S33: the coal gas coming out of the two-stage cyclone dust collector is sent to the dry pulse bag recovery and purification system through the coal gas pipeline for fine dust removal;

[0015] Step S4: Use the low-pressure pulse bag dust collector of the dry pulse bag recovery and purification system to perform fine dust removal, wherein the low-pressure pulse bag dust collector filters and purifies the dust-containing coal gas into a dust content of 5 mg / m 3 The following clean coal gas is produced and sent to the clean coal gas network;

[0016] Step S5: using the pressure-reduced clean gas reverse blowing system of the dry pulse bag recovery and purification system to reduce the gas pressure in the low-pressure pulse bag dust collector and then perform pulse dust removal on the filter bag;

[0017] Step S51: close the inlet valve and the outlet valve of the low-pressure pulse bag filter, and open the pressure relief valve connected to the high-pressure clean gas pressure relief system, transfer the gas in the low-pressure pulse bag filter to the pressure relief transfer tank of the high-pressure clean gas pressure relief system, and close the pressure relief valve when the gas pressure in the low-pressure pulse bag filter is below 0.4MPa;

[0018] Step S52: using the clean coal gas in the clean coal gas network as a pulse injection gas source, wherein when the pressure difference between the coal gas pressure in the low-pressure pulse bag filter and the pressure in the clean coal gas injection gas source pipeline reaches a set value, the pulse valve starts to work, and the dust on the outer surface of the filter bag is cleaned by pulse injection;

[0019] Step S53: After the dust removal is completed, the inlet valve and the outlet valve of the low-pressure pulse bag dust collector are opened, and the low-pressure pulse bag dust collector resumes normal working state;

[0020] Step S54: Open the outlet valve end of the pressure relief transfer tank, and use the natural gas booster of the clean gas recovery and pressurization system to increase the pressure of the gas stored in the pressure relief transfer tank to a pressure higher than the original clean gas pipeline pressure, and then send it to the high-pressure gas storage tank;

[0021] Step S55: Open the outlet valve of the high-pressure gas storage tank to slowly deliver the stored gas into the clean gas pipeline network to avoid the impact of unstable pressurized medium and high pressure gas on the clean gas pipeline network after being directly delivered into the pipeline network.

[0022] The advantages and positive effects of the present invention are:

[0023] 1. The present invention adopts high-pressure clean coal gas + pulse valve pulse cleaning process + dry bag dust removal system to realize the process of dry recovery and purification of medium and high pressure vaporizer coal gas; it overcomes the technical difficulty that pulse cleaning cannot be used for medium and high pressure coal gas, solves the problem of difficulty in dry recovery of medium and high pressure vaporizer coal gas, and meets the requirements of energy conservation, emission reduction and environmental protection policies.

[0024] 2. The present invention discharges the medium and high pressure coal gas in the bag filter to the clean coal gas pressurization recovery system, and then sends it to the clean coal gas network for recycling after pressurization. At this time, the pressure in the bag filter drops to the pulse valve injection pressure range, thereby realizing the low-pressure pulse injection cleaning process.

[0025] 3. Compared with the existing nitrogen tank as the gas source, the present invention uses clean coal gas as the pulse injection gas source, which saves nitrogen and improves the purity of coal gas.

[0026] 4. In the present invention, the clean gas recovered from the gas storage tank is stored in a high-pressure gas storage tank after passing through a gas compressor, and then slowly sent back to the clean gas pipeline network. This will not affect the pressure of the clean gas pipeline network and can also achieve the purpose of energy recovery and utilization.

[0027] 5. The present invention has a simple, reasonable and compact structure, has excellent dust removal and recycling effects, and has low energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] By referring to the following description in conjunction with the accompanying drawings, and with a more comprehensive understanding of the present invention, other objects and results of the present invention will become more apparent and easy to understand. In the accompanying drawings:

[0029] Figure 1 Schematic diagram of the overall structure according to an embodiment of the present invention.

[0030] Figure 2 Schematic diagram of the overall structure of a low-pressure pulse bag dust collector according to an embodiment of the present invention.

[0031] Figure 3 FIG. 4 is a flow chart of the overall structure according to an embodiment of the present invention.

[0032] The accompanying drawings include: medium and high pressure coal gas vaporization furnace 1, heat exchange equipment 2, separation equipment 3, low pressure pulse bag dust collector 4, high pressure clean coal gas pressure relief system 5, pressure relief adapter tank 501, clean coal gas pressure relief pipeline 502, clean coal gas injection gas source pipeline 6, released clean coal gas recovery pressurization system 7, natural gas booster 701, first pipeline 702, second pipeline 703, clean coal gas pipeline network 8, high pressure coal gas storage tank 9. DETAILED DESCRIPTION

[0033] In the following description, for the purpose of illustration, in order to provide a comprehensive understanding of one or more embodiments, many specific details are set forth. However, it is apparent that these embodiments may also be implemented without these specific details. In other examples, for ease of describing one or more embodiments, known structures and devices are shown in the form of block diagrams.

[0034] Example 1

[0035] Figure 1-2 A schematic diagram of the overall structure according to an embodiment of the present invention is shown.

[0036] like Figure 1-2 As shown, the medium- and high-pressure gasifier gas pulse dry recovery and purification system provided by the embodiment of the present invention comprises: a medium- and high-pressure gasifier 1, a heat exchange device 2, a separation device 3, a dust removal system and a clean gas pipeline 8 connected in sequence, the dust removal system comprises: a low-pressure pulse bag dust collector 4 and a pressure-reduced clean gas back-injection system, the low-pressure pulse bag dust collector 4 is used to filter and purify the dust-containing gas into a dust content of 5 mg / m 3 The following clean coal gas, the depressurized clean coal gas back-blowing system is used to reduce the coal gas pressure in the low-pressure pulse bag dust collector 4 and then perform filter bag pulse dust removal, the inlet valve of the low-pressure pulse bag dust collector 4 is connected to the separation equipment 3, the outlet valve of the low-pressure pulse bag dust collector 4 is connected to the clean coal gas pipeline 8, and the low-pressure pulse bag dust collector 4 is additionally provided with a pressure relief valve, the depressurized clean coal gas back-blowing system includes: a high-pressure clean coal gas pressure relief system 5, a released clean coal gas recovery pressurization system 7, a high-pressure coal gas storage tank 9, and a clean coal gas blowing gas with a pulse valve Source pipeline 6, the inlet end of the high-pressure clean coal gas pressure relief system 5 is connected to the pressure relief valve of the low-pressure pulse bag dust collector 4, the outlet valve end of the high-pressure clean coal gas pressure relief system 5 is connected to the inlet valve end of the released clean coal gas recovery and pressurization system 7, the outlet valve end of the released clean coal gas recovery and pressurization system 7 is connected to the inlet valve end of the high-pressure coal gas storage tank 9, the outlet valve end of the high-pressure coal gas storage tank 9 is connected to the clean coal gas pipeline 8, the clean coal gas injection gas source pipeline 6 is connected to the clean coal gas pipeline 8, and the pulse valve uses the clean coal gas in the clean coal gas pipeline 8 as the pulse injection gas source.

[0037] The high-pressure clean coal gas pressure relief system 5 in this embodiment includes: a pressure relief adapter tank 501, a clean coal gas pressure relief pipeline 502 connecting the pressure relief adapter tank 501 and the recovery pressure relief valve in the low-pressure pulse bag dust collector 4, and a pressure alarm located on the clean coal gas pressure relief pipeline 502.

[0038] The released clean coal gas recovery and pressurization system 7 in this embodiment includes: two natural gas boosters 701, a first pipeline 702 connecting the inlet end of the natural gas booster 701 and the outlet valve end of the pressure relief adapter tank 501, and a second pipeline 703 connecting the outlet end of the natural gas booster 701 and the inlet valve end of the high-pressure coal gas storage tank 9.

[0039] In this embodiment, pressure alarms are provided on the clean gas injection gas source pipeline 6, the low-pressure pulse bag dust collector 4, the first pipeline 701 and the second pipeline 702. The pressure alarm is provided with pressure sensors, sensor signal processing modules and other devices. All data enter the PLC, and automatic pulse cleaning and fault alarm are realized through the interlocking control program.

[0040] The self-cleaning principle of the low-pressure pulse bag filter 4 in this embodiment is as follows: the low-pressure pulse bag filter 4 uses high-low pressure pulse air to automatically clean the dust, wherein the filter bag inside the low-pressure pulse bag filter 4 is a component for filtering dusty coal gas. During the filtering process, the clean coal gas passes through the cloth bag into the clean air chamber, and then is sent to the clean coal gas network through the pipeline. The dust in the coal gas will adhere to the outer surface of the filter bag. As the filtering time increases, the dust on the outer surface of the filter bag gradually increases. When a certain resistance is reached, the dust on the outer surface of the filter bag must be cleaned off before the dust collector can enter a normal working state. The clean coal gas injection system uses pulse injection to clean the dust on the outer surface of the filter bag to ensure the normal filtration of the dust collector; and because the coal gas pressure in the medium and high pressure vaporization furnace is much higher than the working pressure allowed by the pulse valve, the low-pressure pulse bag filter 4 cannot achieve pulse cleaning. In this application, the low-pressure pulse bag filter 4 can be self-cleaned in a high-pressure coal gas environment by using a pressure-reducing clean coal gas reverse injection system.

[0041] Example 2

[0042] Figure 3 The figure shows an overall structural flow chart according to an embodiment of the present invention.

[0043] This embodiment provides a pulse dry recovery and purification method for medium- and high-pressure gasifier gas, which specifically includes the following steps:

[0044] Step S1: using a medium- and high-pressure coal gasification furnace 1 to convert coal into coal gas;

[0045] Step S2: heat exchange and cooling the high-temperature dusty coal gas generated by the coal gasification furnace by using the heat exchange device 2. The temperature of the coal gas after heat exchange by the heat exchange device 2 is about 250°C, wherein the superheated steam generated by the heat exchange device 2 is sent back to the medium and high pressure gasification furnace 1;

[0046] Step S3: Rough dust removal using separation equipment 3:

[0047] Step S31: The large dust particles naturally settled down by gravity from the dusty coal gas are cooled and recovered by the ash cooler and then sent to the return system;

[0048] Step S32: the remaining gas is then roughly filtered through the primary cyclone dust collector and the secondary cyclone dust collector, and the filtered dust is sent to the return system through the pneumatic conveying system;

[0049] Step S33: the coal gas coming out of the two-stage cyclone dust collector is sent to the dry pulse bag recovery and purification system through the coal gas pipeline for fine dust removal;

[0050] Step S4: Use the low-pressure pulse bag dust collector 4 of the dry pulse bag recovery and purification system to perform fine dust removal, wherein the low-pressure pulse bag dust collector 4 filters and purifies the dust-containing coal gas to a dust content of 5 mg / m 3 The following clean coal gas is sent to the clean coal gas pipeline network 8;

[0051] Step S5: using the pressure-reduced clean coal gas reverse blowing system of the dry pulse bag recovery and purification system to reduce the coal gas pressure in the low-pressure pulse bag dust collector 4 and then perform pulse dust removal on the filter bag;

[0052] Step S51: close the inlet valve and the outlet valve of the low-pressure pulse bag filter 4, and open the pressure relief valve connected to the high-pressure clean gas pressure relief system, transfer the gas in the low-pressure pulse bag filter 4 to the pressure relief transfer tank 501 of the high-pressure clean gas pressure relief system, and close the pressure relief valve when the gas pressure in the low-pressure pulse bag filter 4 is below 0.4 MPa;

[0053] Step S52: using the clean coal gas in the clean coal gas network 8 as the pulse injection gas source, wherein when the pressure difference between the coal gas pressure in the low-pressure pulse bag filter 4 and the pressure in the clean coal gas injection gas source pipeline 6 reaches a set value, the pulse valve starts to work, and the dust on the outer surface of the filter bag is cleaned by pulse injection;

[0054] Step S53: After the dust removal is completed, the inlet valve and the outlet valve of the low-pressure pulse bag dust collector 4 are opened, and the low-pressure pulse bag dust collector 4 resumes normal working state;

[0055] Step S54: Open the outlet valve end of the pressure relief transfer tank 501, and use the natural gas booster 701 of the clean gas recovery and pressurization system to increase the pressure of the gas stored in the pressure relief transfer tank 501 to a pressure higher than the original clean gas pipeline 8 pressure, and then send it to the high-pressure gas storage tank 9;

[0056] Step S55: Open the outlet valve end of the high-pressure gas storage tank 9 to slowly deliver the stored gas into the clean gas pipeline network 8 to avoid the unstable pressurized medium and high pressure gas being directly delivered into the clean gas pipeline network 8, which would cause impact on the pipeline network.

[0057] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A medium- and high-pressure gasification furnace gas pulse dry recovery and purification system, comprising: The medium and high pressure coal gasification furnace, heat exchange equipment, separation equipment, dust removal system and clean coal gas pipeline network are connected in sequence, characterized in that the dust removal system includes: a low pressure pulse bag dust collector and a pressure-reduced clean coal gas back-injection system, the low pressure pulse bag dust collector is used to filter and purify the dusty coal gas into a dust content of 5mg / m 3 The following clean coal gas, the depressurized clean coal gas back-injection system is used to reduce the gas pressure in the low-pressure pulse bag dust collector and then perform filter bag pulse dust removal, the inlet valve of the low-pressure pulse bag dust collector is connected to the separation equipment, the outlet valve of the low-pressure pulse bag dust collector is connected to the clean coal gas pipeline network, the low-pressure pulse bag dust collector is additionally provided with a pressure relief valve, the depressurized clean coal gas back-injection system includes: a high-pressure clean coal gas pressure relief system, a released clean coal gas recovery pressurization system, a high-pressure coal gas storage tank, and a clean coal gas spray with a pulse valve The blowing air source pipeline, the inlet end of the high-pressure clean coal gas pressure relief system is connected to the pressure relief valve of the low-pressure pulse bag dust collector, the outlet valve end of the high-pressure clean coal gas pressure relief system is connected to the inlet valve end of the released clean coal gas recovery and pressurization system, the outlet valve end of the released clean coal gas recovery and pressurization system is connected to the inlet valve end of the high-pressure coal gas storage tank, the outlet valve end of the high-pressure coal gas storage tank is connected to the clean coal gas pipeline network, the clean coal gas blowing air source pipeline is connected to the clean coal gas pipeline network, and the pulse valve uses the clean coal gas in the clean coal gas pipeline network as the pulse blowing air source.

2. A medium- and high-pressure gasifier gas pulse dry recovery and purification system according to claim 1, characterized in that: The high-pressure clean coal gas pressure relief system includes: a pressure relief adapter tank, a clean coal gas pressure relief pipeline connecting the pressure relief adapter tank and a low-pressure pulse bag dust collector recovery pressure relief valve, and a pressure alarm located on the clean coal gas pressure relief pipeline.

3. A medium- and high-pressure gasifier gas pulse dry recovery and purification system according to claim 1, characterized in that: The released clean coal gas recovery and pressurization system includes: at least one natural gas booster, a first pipeline connecting the natural gas booster inlet end and the pressure relief adapter tank outlet valve end, and a second pipeline connecting the natural gas booster outlet end and the high-pressure coal gas storage tank inlet valve end.

4. A medium- and high-pressure gasifier gas pulse dry recovery and purification system according to claim 1, characterized in that: The clean coal gas injection gas source pipeline, the low-pressure pulse bag dust collector, the first pipeline and the second pipeline are all provided with pressure alarms.

5. A pulse dry recovery and purification method for medium and high pressure gasifier gas, characterized in that: The following steps are involved: Step S1: using a medium- and high-pressure gasification furnace to convert coal into coal gas; Step S2: using a heat exchange device to heat and cool down the high-temperature dusty coal gas generated by the coal gasification furnace. The temperature of the coal gas after heat exchange by the heat exchange device is about 250°C, wherein the superheated steam generated by the heat exchange device is sent back to the medium and high pressure gasification furnace; Step S3: Rough dust removal using separation equipment: Step S31: The large dust particles naturally settled down by gravity from the dusty coal gas are cooled and recovered by the ash cooler and then sent to the return system; Step S32: the remaining gas is then roughly filtered through the primary cyclone dust collector and the secondary cyclone dust collector, and the filtered dust is sent to the return system through the pneumatic conveying system; Step S33: the coal gas coming out of the two-stage cyclone dust collector is sent to the dry pulse bag recovery and purification system through the coal gas pipeline for fine dust removal; Step S4: Use the low-pressure pulse bag dust collector of the dry pulse bag recovery and purification system to perform fine dust removal, wherein the low-pressure pulse bag dust collector filters and purifies the dust-containing coal gas into a dust content of 5 mg / m 3 The following clean coal gas is produced and sent to the clean coal gas network; Step S5: using the pressure-reduced clean gas reverse blowing system of the dry pulse bag recovery and purification system to reduce the gas pressure in the low-pressure pulse bag dust collector and then perform pulse dust removal on the filter bag; Step S51: close the inlet valve and the outlet valve of the low-pressure pulse bag filter, and open the pressure relief valve connected to the high-pressure clean gas pressure relief system, transfer the gas in the low-pressure pulse bag filter to the pressure relief transfer tank of the high-pressure clean gas pressure relief system, and close the pressure relief valve when the gas pressure in the low-pressure pulse bag filter is below 0.4MPa; Step S52: using the clean coal gas in the clean coal gas network as a pulse injection gas source, wherein when the pressure difference between the coal gas pressure in the low-pressure pulse bag filter and the pressure in the clean coal gas injection gas source pipeline reaches a set value, the pulse valve starts to work, and the dust on the outer surface of the filter bag is cleaned by pulse injection; Step S53: After the dust removal is completed, the inlet valve and the outlet valve of the low-pressure pulse bag dust collector are opened, and the low-pressure pulse bag dust collector resumes normal working state; Step S54: Open the outlet valve end of the pressure relief transfer tank, and use the natural gas booster of the clean gas recovery and pressurization system to increase the pressure of the gas stored in the pressure relief transfer tank to a pressure higher than the original clean gas pipeline pressure, and then send it to the high-pressure gas storage tank; Step S55: Open the outlet valve of the high-pressure gas storage tank to slowly deliver the stored gas into the clean gas pipeline network to avoid the impact of unstable pressurized medium and high pressure gas on the clean gas pipeline network after being directly delivered into the pipeline network.

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