JPH0378520B2 - - Google Patents

Description

[Detailed description of the invention]

INDUSTRIAL APPLICATION FIELD The present invention relates to a city gas production plant, and in particular to a 13A gas production plant in which propane is diluted with air.
The present invention relates to a production plant for producing propane air gas. Conventional technology Conventionally, the forms of city gas production plants include catalytic cracking plants using naphtha or butane as raw materials;
Coal gas plateau made from coal or coke,
There are butane air plants and LNG plants that dilute butane by mixing air. Catalytic cracking plants use catalysts to control the reaction temperature.
This is a method of reacting naphtha or butane with steam at 400°C to 800°C to convert the raw material naphtha or butane into methane, hydrogen, carbon monoxide, and carbon dioxide. A coal gas plant reacts coal and coke as raw materials with air and steam as gasifying agents,
It decomposes into hydrogen, methane, carbon dioxide, etc., and the generation furnace is used to separate the residual heat phase (carbonization), reduction layer, oxidation layer,
It is composed of four layers of ash. A butane air plant is a method in which butane is vaporized using a vaporizer that requires thermal energy such as electricity, hot water, or steam, and then mixed with air and diluted using a mixer to produce a predetermined amount of calories. LNG plants receive cooled, liquefied natural gas into ultra-low temperature storage equipment, vaporize it in an LNG vaporizer, adjust it to a predetermined amount of heat, and then supply it. Problems to be Solved by the Invention However, the above-mentioned conventional city gas production plants have various problems. Catalytic cracking plants that use naphtha or putane as raw materials contain 12% to 20% carbon monoxide in the feed gas generated from the gasification plant, and to prevent poisoning, carbon _monoxide conversion is performed to prevent poisoning. Although the carbon oxide content has been reduced, several percent of carbon monoxide still remains, making it impossible to completely prevent fatal accidents caused by raw gas poisoning. In addition, the catalytic cracking plant has equipment that generates vibrations and noise, such as blowers and pumps for compressed gas and air supply, so the economic burden cannot be avoided in addition to pollution caused by vibration and sound insulation. . Even plant wastewater is a source of pollution and requires strict monitoring at all times. In addition, since gas blowing is performed during manufacturing, measures must be taken to prevent odor pollution and environmental hygiene pollution caused by exhaust gas. Furthermore, the gas produced from such plants has the physical phenomenon of being re-liquefied as it is a wet gas, and is susceptible to blockages due to water turbidity in the pipes and gas meters, freezing of gas meters in winter, or corrosion inside the pipes due to moisture. There are many problems such as gas leaks, and in order to prevent these problems, regular water intake work and pipe inspections must be carried out, resulting in large personnel costs, maintenance costs, etc. . Coal and gas plants use coal and coke as raw materials, and therefore require a huge amount of land and huge equipment to store the raw materials. Butane air gas method conventionally requires electricity, hot water, steam, etc. to gasify butane.
Since the manufacturing equipment itself uses fire, there is always a risk of ignition and explosion, and there have been many cases of this happening, which is not desirable from a security standpoint. Also, electric type, hot water type,
Each steam heat source requires attached equipment such as a boiler and liquid pump, and maintenance and management of these equipment is necessary and important, which is a burden in terms of human resources, energy, and expenses. This is a huge burden, especially for small and medium-sized gas utilities. In addition, an LNG plant receives natural gas cooled to -162℃ into an ultra-low temperature storage facility, vaporizes it in an LNG vaporizer, adjusts the calorific value to 11,000 Kcal/ ^Nm3 , and supplies the gas, which requires special storage facilities. , auxiliary equipment, other special receiving equipment, transportation equipment, etc., as well as a huge amount of capital, are required, and such plants are only available to major gas companies. Furthermore, due to the characteristic that the boiling point of liquefied natural gas is -162℃, the plant has special handling requirements.
There are problems that require sufficient skill and care. In this way, conventional gas production plants require large-scale equipment, complex heat source equipment, and power equipment.
It required a large amount of labor and expense in terms of construction costs, maintenance, and security management. Furthermore, as shown in Table 1, there are many types of city gas currently in use, making it extremely complicated for consumers as well as gas appliance manufacturers and manufacturers. We are proceeding with unification.

【table】

[Table] Purpose of the Invention The main purpose of the present invention is to produce 13A, which is highly safe and free from the danger of fire when producing city gas.
Our purpose is to provide a plastic air gas manufacturing plant. Another object of the present invention is to realize inexpensive manufacturing equipment and ease of operation by eliminating the need for incidental equipment, especially equipment that requires power from an external heat source, and eliminating the need for complicated electric equipment for control equipment. It is an ideal city gas production plant for small and medium-sized gas utilities, as it minimizes the number of operators, reduces the required site area, and significantly reduces production and maintenance costs. Our purpose is to provide a 13A propane air production plant. Another object of the present invention is to provide a propane air manufacturing plant that can prevent conduit blockage due to dew condensation or mixed moisture, and freeze blockage of gas meters, and can supply stable gas to consumers. Still another object of the present invention is to provide a 13A propane air gas manufacturing plant that is fully adaptable to the current administrative policy of unifying the types of city gas to 13A based on the guidance of the Ministry of International Trade and Industry. . Means for Solving the Problems The above objects are fully achieved by the present invention. In summary, the present invention includes (a) a storage tank for storing liquefied propane gas; (b) a controller box for reducing the pressure of liquefied propane gas supplied from the storage tank; (c) a storage tank for storing liquefied propane gas supplied from the controller box; (d) at least two or more air-heated forced vaporizers for vaporizing the reduced pressure liquefied propane gas to obtain propane gas of 0.7 to 1.0 Kg/ ^cm2 ; A main regulator that regulates the supplied propane gas to a constant pressure of 0.7 kg/cm ² , and a ventilator that mixes air with the regulated propane gas from the main regulator to obtain propane air gas. a tube, and at least two or more air mixers equipped with air control valves that control the amount of air flowing into the ventilate tube; (e) a gas holder that stores propane air gas sent out from the air mixer; (f) Receive a signal from a gas capacity detection device provided in the gas holder, operate the main regulator of the selected air mixer, and control each air according to the amount of gas in the gas holder. an air mixer control means for controlling the operation of the mixer; (g) recovering a portion of the propane air gas at the outlet position of each of the air mixers and the propane air gas fed from all the air mixers, and measuring the calorific value; 13A propane for producing 13A propane air gas, comprising: a heat amount adjustment line for controlling the air control valve and adjusting the amount of air flowing into the ventilator tube based on the above; It is an air gas production plant. According to a preferred embodiment of the invention, the piping line for recovering a portion of the propane air gas delivered from the air mixer comprises:
It consists of a small-diameter inner tube and a large-diameter outer tube that surrounds and protects the inner tube. Next, the 13A propane air gas production plant according to the present invention will be explained in more detail with reference to the drawings. FIG. 1 is a flow sheet illustrating a 13A propane air gas production plant in accordance with the present invention. According to the invention, the plant 1 can be
The liquefied propane gas L carried into the plant is stored in a storage tank 2 installed within the plant.
The liquefied propane gas L in the storage tank 2 is connected to the controller box 6 (6) via the piping line 4.
a, 6b and 6c) and depressurized. The reduced pressure liquefied propane gas L is supplied to the vaporizer 10 (10a, 10b, and 10c) through the piping line 8, and is vaporized. According to the present invention, the vaporizer 10 is an air temperature (atmospheric temperature) forced vaporizer that utilizes solar energy. Air temperature (atmospheric temperature) type forced vaporizer 1
Reference numeral 0 designates a Finch-Yub type vaporizer, which has a supply side manifold 12 and a discharge side manifold 14, as shown in FIGS. 2 and 3. A large number of heat transfer tubes 16 are connected between them. Furthermore, in order to improve the heat transfer (endothermic) effect of the heat transfer tube 16, heat transfer fins 18 are disposed around the heat transfer tube 16. Therefore, when the liquefied propane gas L is supplied to the vapor riser 10 via the piping line 8, the liquefied propane gas L flows into the supply side manifold 14 of the vapor riser 10, and then passes through the heat transfer tube 16 to the discharge side. Flows to manifold 14. At this time, the liquefied propane gas L is vaporized into propane gas G by the action of the heat transfer tube 16 and the heat transfer fin 18. The propane gas G vaporized and generated in the vaporizer 10 is sent to the air mixer 22 (22a, 22b, and 22c) through the piping line 20. The propane gas G is supplied to the air mixer 22.
^13A propane air gas which is mixed and diluted with air at
Rated PG. The propane air gas PG matches the calorific value of city gas produced in large-scale LNG plants in large cities, and is extremely convenient for general users as they can use common gas appliances. It is. In addition, the production of such gas is suitable as it is consistent with the administrative policy of the Ministry of International Trade and Industry, which aims to comprehensively standardize the types of city gas. In addition, since the gas is a dry gas, there are no problems such as blockage of the pipe due to water accumulation in the pipe or gas meter, freezing of the gas meter in winter, or gas leakage due to corrosion inside the pipe due to moisture, thus preventing such problems. There is no need to carry out regular water intake work or pipe inspections, etc., which can reduce personnel costs, maintenance costs, etc. The air mixer 22 may be of a ventilator tube type, a blower type, a flow rate ratio control type, etc., but in this embodiment, a case where a ventilator tube type is adopted as illustrated in FIG. 4 will be described. The ventilator tube 24 connects a piping line 20 on the inlet side and a piping line 26 on the outlet side.
and the bench turret tube 24.
Propane gas G of 0.7 to 1.0 kg/cm ² is supplied from the vaporizer 10 after being regulated to a constant pressure, for example, 0.7 kg/cm ² by the main regulator 25. Furthermore, a filter box ( (not shown), air is drawn in through the piping line 28, and the propane gas G and air are mixed in the ventilate tube 24. The amount of air sucked into the ventilator tube 24 is controlled by an air control valve 30 disposed in the piping line 28 in a manner described later, and the mixing ratio of propane gas G and air is propane:air= The ratio is set to 2:1. The propane air gas PG generated as described above is delivered to the gas holder 32 through the piping line 26 and stored therein. The propane air gas PG once stored in the gas holder 32 has a calorific value
It is supplied to general users at 15,000 Kcal/Nm ³ and a supply pressure of 250 mmH ₂ O. The amount of propane air gas PG in the gas holder 32 is adjusted by controlling the operation of the air mixer 22, and the gas capacity in the gas holder is controlled by a gas capacity detection device 34 provided in the gas holder 32. Detected. Next, the control mode of the propane air production plant 1 configured as described above will be further explained. The control means for controlling the operation and stop of the air mixer 22 includes a capacity detection device 34 of the gas holder 32;
For example, it is equipped with a high-voltage oscillator. The capacity detection device 3
The electrical signal from 4 is transmitted to the line switching controller 102 provided in the central control room 100 by an electrical cable E1. The line switching controller 102 is connected by an electric cable E2 to a corresponding explosion-proof solenoid valve 27 that controls each main regulator 25 of each air mixer 22 (22a, 22b and 22c). When the solenoid valve 27 is opened according to an instruction from the line switching controller 102, pressure is supplied from the compressed air supply source 200 through the operating air lines A1, A2, and A3.
Compressed air of 5.5Kg/ ^cm2 is sent to the main regulator 25.
The valve of the main regulator 25 is opened, and the propane gas G vaporized by the vaporizer 10 is blown out to the air mixer 22.
The compressed air supply source 200 can have any configuration, but includes an air compressor 202 that supplies air at a constant pressure necessary to operate the main regulator 25 and other air control valves;
It is preferable to include a freezing dehumidifier 204 that dehumidifies the operation air from the air compressor 202, and a receiver tank 206 that stores the operation air at a constant pressure. As described above, each air mixer 22a, 2
2b and 22c are line switching controllers 102
An example of the control mode will be explained based on the present embodiment shown in FIG. 1. When the capacity of the gas holder 32 is 100 m ³ ,
The line switching controller 102 is the gas holder 3
When the air mixer 22a has a height of 70 m ³ , an instruction is issued to operate the air mixer 22a, and one unit is operated by the air mixer 22a. However, when the amount of gas produced by one air mixer 22a is insufficient and the height of the gas holder 32 drops to ^65m3 , an instruction is issued to operate the air mixer 22b, and the air mixer 22a and Even with the operation of two units of 22b, the amount of gas produced was insufficient and gas holder 3
When the height of the air mixer 22c decreases to 60m ³ , an instruction to operate the air mixer 22c is issued. On the other hand, when the height of the gas holder 32 reaches ^80m3 , the air mixer 22c is stopped, the air mixer 22b is stopped when the height of the gas holder ³² is 85m3, and the air mixer 22a is also stopped when the height of the gas holder ^{32 is} 90m3. air mixer 2
2 is stopped. According to the gas production plant of the present invention, a calorific value adjustment line is provided. According to the present invention, a Lauter type calorimeter 104 is installed in the central control room 100, and piping is installed to measure the gas calorific value at the outlet position of each air mixer 22a, 22b, and 22c and the total calorific value of the gas fed from all the air mixers. A portion of the gas is recovered from the line 26 via the calorimetry pipes C1 to C4. The calorific value of the gas thus recovered is measured by a Lauter calorimeter 104. The central control room 100 further includes a mixing air flow rate adjustment device 1.
06 is provided, the device 106 is connected to an electrical cable E
3. Air mixer 22 by E4 and E5
It is connected to an electropneumatic positioner 31 that operates a control valve 30 that controls the amount of air flowing into the air. In such a configuration, an operator operates the mixing air flow rate adjusting device 106 according to the indicated value of the Lauter calorimeter, and sends an electric signal to the electropneumatic positioner 31 via the electric cables E1 to E3. Based on the signal, the electropneumatic positioner 31 converts the electric signal into a pneumatic signal to control the opening degree of the pneumatic control valve 30. As a result, the amount of air supplied to the air mixer 22 is finely adjusted, the ratio of the amount of air to the propane gas in the generated propane air gas is adjusted, and as a result, the amount of heat of the gas is adjusted. In the above explanation, the mixing air flow rate adjusting device 1
Although 06 has been described as being operated by an operator, it can also be automated by interlocking with a calorimeter. The present invention is characterized by the structure of the calorimetry lines C1 to C4 used in the calorific value adjustment lines. The calorimetry lines C1 to C4 according to the present invention are the fifth
As illustrated in FIG. 6 and FIG.
mm, preferably 6 mm, and a wall thickness of 0.8 to 1.2 mm, preferably 1 mm, for example, an inner tube 40 made of copper;
For example, the inner diameter is 20 to 30 mm, preferably 27.6 mm, and the wall thickness is 2 to 5 mm, preferably 3.2 mm.
mm, and a protective outer tube 42 made of steel, for example. The piping line for recovering the sample gas and sending it to the Lauter calorimeter 104 is changed from a conventional large-diameter pipe with an inner diameter of 20 mm, for example, to a 6-inch pipe as in the present invention.
By using a small diameter tube (mm), it is possible to measure and adjust the amount of heat instantly.
1, which was unique to calorimetry and adjustment in the past.
Time lags of minutes to two minutes can be completely eliminated. Therefore, in the plant of the present invention, the gas holder 32 can have an extremely small capacity when the gas production amount is, for example, about 10,000 m ³ /day. This not only simplifies the construction of the gas production plant, but also provides significant benefits in terms of land and construction costs. Protective outer tube 4 arranged around the inner tube 40
2 is for protecting the inner tube 40, and has the function of keeping the sample gas flowing inside the inner tube 40 warm by causing hot air to flow between the inner tube 40 and the outer tube 42. Due to this heat retention effect, the sample gas is not affected by the atmospheric temperature, and calorimetric analysis can be performed quickly and accurately. The double-pipe piping line described above can be used not only for the calorimetry lines C1 to C4 but also for the operating air lines A1 to A3. The propane air gas production plant according to the present invention further includes an emergency shutoff valve that operates when an abnormal leak occurs in a pipeline, etc., and an emergency stop device that stops the flow of gas in an emergency when an abnormality occurs in the gas generation equipment. can be installed. Further, a central control room for controlling the plant of the present invention is provided with a graphic monitoring panel showing the configuration of the plant, so that the operating status of the plant can be grasped in detail. Effects of the Invention Since the present invention is configured as described above, (1) Since an air-heated forced vaporizer is used as the vaporizer, there is no need for heat sources such as electricity, hot water, or steam, and there is no flame. It is safe from a security standpoint, with no risk of disasters such as ignition, explosion, or fire.
Moreover, running costs are low. Also, boiler,
A large power source such as a liquid pump is not required, the plant structure and equipment are simple, construction costs are low, and there is no mechanical failure of the equipment, so there is almost no need for plant maintenance, making it easy to maintain and manage the plant. is easy. Furthermore, since no preheating or the like is required, operation starts quickly and calorie fluctuations are small. (2) Equipped with multiple air mixers, the calorific value of the propane air gas produced by each air mixer and the propane air gas from all air mixers is measured, and the amount of air flowing into each air mixer is adjusted. , 13A propane air gas with a constant calorific value is produced. (3) The operation of multiple air mixers is controlled on and off depending on the gas capacity in the gas holder, so propane air gas can be produced in response to fluctuations in demand, ensuring a constant supply. It is possible to supply 13A propane air gas to consumers at a calorific value and at a predetermined pressure. (4) Operation is easy and automatic unmanned operation is possible, requiring a minimum number of operating personnel. (5) It is a pollution-free plant, with no pollution elements such as noise, vibration, drainage, and exhaust gas. (6) Gasification efficiency is 100%, and there is no carbon monoxide in the produced gas, making it harmless. (7) The capacity of the gas holder is minimal and the construction cost is low. (8) Existing pipes can be used because the pipe efficiency is dramatically increased (2 to 3 times). (9) It can be suitably used not only as a plant for small and medium-sized gas utilities, but also as a large-scale plant, and can also be miniaturized for industrial use.
It is also suitable for home use. (10) When converting natural gas, the mechanical and compact plant according to the present invention can be very suitably used when partial satellite supply is required due to a defect in the pipeline network. It has various benefits such as:

[Brief explanation of drawings]

FIG. 1 is a flow sheet of a propane air gas production plant according to the present invention. FIGS. 2 and 3 are a front view and a plan view of the air-heated forced vaporizer. FIG. 4 is a schematic explanatory diagram of the air mixer. FIGS. 5 and 6 are longitudinal and cross-sectional views of a double pipe type piping lie. 2: Storage tank, 6: Control box, 10: Air temperature forced vaporizer, 22: Air mixer, 24: Venture tube, 25: Main regulator, 27: Solenoid valve, 30: Air control valve, 31: Electric Empty positioner, 32: Gas holder, 40: Inner pipe, 42: Outer pipe, 100: Central control room, 102: Line switching controller, 104:
Lauter calorimeter, 106: mixing air flow rate regulator, 200: compressed air supply source.

Claims (1)

[Scope of Claims] 1 (a) a storage tank for storing liquefied propane gas; (b) a controller box for reducing the pressure of liquefied propane gas supplied from the storage tank; (c) a storage tank for storing liquefied propane gas supplied from the controller box; The reduced pressure of liquefied propane gas is vaporized to a temperature of 0.7 to 1.0
At least two or more air-heated forced vaporizers for obtaining propane gas of Kg/cm ² ; (d) Propane gas supplied from the air-heated forced vaporizers is heated to a constant pressure of 0.7 Kg/cm ² A main regulator that regulates the pressure to at least two or more air mixers equipped with air control valves to control; (e) a gas holder for storing propane air gas sent out from the air mixer; (f) a gas capacity detector provided in the gas holder; an air mixer control means that receives a signal from the device, operates the main regulator of the selected air mixer, and controls the operation of each of the air mixers according to the amount of gas in the gas holder; (g ) Collect a portion of the propane air gas at the outlet position of each air mixer and the propane air gas fed from all the air mixers, measure the calorific value, control the air control valve based on the result, and A 13A propane air gas production plant for producing 13A propane air gas, comprising: a heat amount adjustment line for adjusting the amount of air flowing into the Yuchi tube; 2 A patent claim in which a piping line for recovering a portion of the propane air gas sent out from an air mixer in a heat adjustment line consists of a small-diameter inner pipe and a large-diameter outer pipe that surrounds and protects the inner pipe. 13A propane air gas manufacturing plant as described in item 1.