TW202344773A - Device and method of multiple tanks jointly supplying gas characterized in that by using the temperature controller of each evaporation device to control the temperature of each storage tank at the same temperature, each storage tank can output gas with same pressure, thereby controlling the storage tank to output a predetermined amount of gas in a manner of more sensitivity, accuracy, safety and stability - Google Patents

Abstract

Disclosed are a device and a method of multiple tanks jointly supplying gas. The device and the method refer to a device and a method, which can simultaneously supply a predetermined amount of gas for a processing equipment from multiple liquefied liquid storage tanks and include a gas combiner, two or more sets of liquefied liquid storage tank heating evaporation gas supply facility (hereinafter referred to as an evaporation device) and a program controller. By using the temperature controller of each evaporation device to control the temperature of each storage tank at the same temperature, each storage tank can output gas with same pressure, thereby controlling the storage tank to output a predetermined amount of gas in a manner of more sensitivity, accuracy, safety and stability.

Description

Device and method for common air supply to multiple tanks

The present invention relates to a device and method for jointly supplying air to multiple tanks; in particular, it relates to a method of controlling the temperature of each storage tank separately to control the pressure in each storage tank at the same predetermined pressure state to meet the requirements of the supply process. Devices and methods for jointly supplying gas to multiple tanks.

Nowadays, a lot of various gases are used in many industrial processes. In order to facilitate transportation and storage, most of the gases are liquefied and stored in liquefied liquid storage tanks such as cylinders and steel tanks. When needed, the gases are removed from the storage tanks. Evaporate and discharge the required gas. In addition, when a large amount of supply gas is required, the evaporation of the liquefied liquid can be accelerated by heating the storage tank. However, if the heating temperature exceeds a certain level, the storage tank may overheat and explode. Therefore, due to various limitations such as the upper limit of heat resistance of the storage tank, the conventional technology still has the problem of insufficient air supply even if the storage tank is heated. In order to solve this problem, there is a need to heat and supply air to multiple storage tanks at the same time. Therefore, many heating control methods have been developed.

The conventional methods for controlling the evaporation of gas liquefied liquids can be roughly divided into two types. One is a method of controlling the heating of the storage tank based on the outlet pressure, and the other is a method of controlling the heating of the storage tank based on the scale signal of the storage tank. Both can be used. It has the effect of supplying a large amount of gas in a short time.

However, the conventional method of controlling storage tank heating based on the outlet pressure can only control the heater of a single storage tank in turn, and does not have the function of controlling the heaters of multiple storage tanks at the same time. As a result, the heating temperature and pressure of each storage tank are inconsistent, resulting in The evaporated gases in each storage tank flow back into each other due to different pressures. In addition, this method controls the heating power output of the heater of the storage tank based on the outlet pressure, which has a problem of insufficient control accuracy. Furthermore, since the temperature is a dependent variable in this method, there is also a risk that the storage tank may overheat and explode. The main feature of the conventional method of controlling storage tank heating based on the storage tank scale signal is to use a floor scale to obtain the weight signal of the storage tank, and then control the heating power output of the heater of the storage tank based on the weight signal of the scale. This control method also has various features, such as There are problems such as the evaporation gases in the storage tank flowing back into each other due to different pressures, insufficient control accuracy, and the storage tank may overheat and explode.

In view of this, the inventor actively researched and found that controlling each storage tank to the same temperature can control the pressure of each storage tank to the same pressure. Therefore, the pressure of the gas supply outlet can be ensured to be stable, and the gas supply pipelines can also avoid mutual backflow. Coupled with the program controller to control the opening or closing of the storage tank air supply control valve according to the storage tank weight information to control its flow, various purposes can be achieved, such as achieving the purpose of exhausting all storage tanks at the same time, or making a single storage tank Use it up first and replace it separately to achieve the purpose of uninterrupted air supply. In this way, the shortcomings of conventional pressure-controlled heaters or weight-controlled heaters can be avoided, and the present invention was finally developed.

The object of the present invention is to provide a method that can control multiple storage It is a multi-slot common gas supply device that controls the storage tank to output a predetermined amount of gas more sensitively, accurately, safely and stably.

The structure of the present invention to achieve the above object includes: a gas manifold, two or more sets of evaporation devices and a program controller; the gas manifold is provided with a first gas supply pipe connected to the process equipment; the evaporation devices respectively include: a A storage tank, which stores a predetermined amount of liquefied liquid; a floor scale, used to measure the weight of the storage tank to obtain weight information of the storage tank; a heater, used to heat the storage tank; a temperature controller, the temperature The controller is connected to the heater to control the storage tank to maintain a predetermined temperature; a second air supply pipe is connected to the storage tank and the gas manifold; a control valve is used to control the second air supply pipe. The flow rate of the gas pipe; the program controller is connected to the scales and control valves of the evaporation devices respectively; it controls the opening of the control valves to adjust or close the air supply flow based on the weight information of the storage tanks of the evaporation devices.

Preferably, the program controller can control the opening of the control valve of the relatively light storage tank to reduce the air supply flow or close it, so as to achieve the purpose of depleting the liquefied liquid in each storage tank at the same time.

Preferably, the program controller can control the control valve based on the weight information of the storage tanks so that the liquefied liquid in one of the storage tanks is exhausted first.

Preferably, the first air supply pipe is provided with a first pressure gauge to indicate the air supply pressure to facilitate the operator to monitor the operating pressure.

Preferably, the second air supply pipes of the evaporation devices are respectively provided with a second pressure warning device; the second pressure warning device is also connected to the heating device. When the second pressure information exceeds a predetermined warning pressure, the heater will cut off the heating power to stop heating and send out a warning signal to improve the safety of the storage tank.

Preferably, the second gas supply pipes of the evaporation devices are respectively provided with a one-way valve; the one-way valve restricts the gas output from the storage tank to the gas manifold, ensuring that the gas output from any storage tank can be Will not pour into other storage tanks.

Preferably, the storage tanks of these evaporation devices are pressure vessels such as cylinders or steel tanks.

Preferably, the storage tank is provided with a temperature warning device; the temperature warning device is used to measure the temperature of the storage tank; the temperature warning device is connected to the heater; when the temperature of the storage tank exceeds a predetermined warning temperature, the temperature warning device It will cut off the power of the heater to stop heating and send a warning signal to improve safety.

Preferably, the second air supply pipes are connected to the gas manifold at the same angle in the downstream direction to prevent the air flows of the second air supply pipes from mutually expelling each other.

Another object of the present invention is to provide a multi-tank common gas supply method that can control multiple storage tanks together to more sensitively, accurately, safely and stably control the output of a predetermined amount of gas from the storage tanks.

The method of the present invention to achieve the above object includes the following steps: controlling the temperature of the storage tanks of the evaporation devices at the same temperature, so that the storage tanks all output a predetermined amount of gas at the same pressure.

Preferably, the storage tanks are controlled based on the weight information of the storage tanks. The gas output flow rate of the storage tank is such that the gas output flow rate of the relatively lighter storage tank is smaller than the gas output flow rate of the relatively heavier storage tank, so that the liquefied liquid in each storage tank is exhausted at the same time.

Preferably, the gas output flow rate of the storage tanks is controlled based on the weight information of the storage tanks so that the liquefied liquid in one of the storage tanks is exhausted first.

In order to achieve the above and other objects, the technical means, components and effects adopted by the present invention are described below using a preferred embodiment with illustrations.

100: Device with multiple tanks for common air supply

1: Gas manifold

11:Air supply pipe

12: First pressure gauge

2: Evaporation device

21:Storage tank

22: Floor scale

23:Heater

24: Temperature controller

25:Second air supply pipe

26:Control valve

27: Second pressure alarm

28: One-way valve

29: Temperature warning device

3: Program controller

101: Process equipment

[Fig. 1] is a flow chart of the first embodiment of the present invention.

[Fig. 2] is a schematic structural diagram of the first embodiment of the present invention.

[Fig. 3] is a schematic diagram of various signal transmissions in the first embodiment of the present invention.

[Fig. 4] is a flow chart of the second embodiment of the present invention.

Figures 1 to 3 show the first embodiment of the present invention. As shown in Figures 1 to 3, the multi-tank common gas supply method of the present invention can use two or more groups of evaporation devices 2 to jointly supply a predetermined amount of gas to a process equipment 101, which includes the following steps: The temperature is controlled at the same temperature, so that the storage tanks all output a predetermined amount of gas at the same pressure; by this method, a more sensitive, precise, safe and stable control of the storage tank's output of a predetermined amount of gas can be achieved. This will be explained in detail below.

Figures 2 to 3 show a multi-tank common air supply device 100 that cooperates with the multi-tank common air supply method. The structure of the multi-tank common gas supply device 100 includes a gas manifold 1, more than two sets of evaporation devices 2 and a program controller 3; the gas manifold 1 is provided with a first gas supply pipe 11 connected to the process equipment 101 ; The evaporation devices 2 respectively include: a storage tank 21, which stores a predetermined amount of liquefied liquid; a floor scale 22, used to measure the weight of the storage tank 21 to obtain the weight information of the storage tank; a heater 23, Used to heat the storage tank 21; a temperature controller 24, the temperature controller 24 is connected to the heater 23 to control the storage tank 21 to maintain a predetermined temperature; a second air supply pipe 25, the second air supply pipe 25 Connect the storage tank 21 and the gas manifold 1; a control valve 26 to control the flow of the second gas supply pipe 25; the program controller 3 is connected to the floor scales 22 and control valves 26 of the evaporation devices 2 respectively; according to The weight information of the storage tanks 21 of the evaporation devices 2 respectively controls the opening of the control valve 26 to adjust the air supply flow or close it.

The gas manifold 1 is provided with a first gas supply pipe 11 connected to the process equipment 101 for collecting the gas discharged from the storage tanks 21 to supply gas with stable pressure to the process equipment 101 .

The present invention has more than two sets of evaporation devices 2. In FIG. 2, only two sets of evaporation devices 2 are taken as an example. In fact, three, four or more sets of evaporation devices can be used according to the usage requirements.

A predetermined amount of liquefied liquid is stored in the storage tank 21, and gas can be output to the outside. The storage tank 21 may be a pressure vessel such as a steel cylinder or a steel tank.

The floor scale 22 is used to measure the weight of the storage tank 21 to obtain the weight information of the storage tank.

The heater 23 is used to heat the storage tank 21 and may be a heating blanket covering the outside of the storage tank 21 .

The temperature controller 24 is connected to the heater 23 to control the storage tanks 21 to maintain a predetermined temperature so that the storage tanks 21 can all output gas at the same pressure and prevent the gas output from each storage tank 21 from flowing back into each other. Taking liquefied liquid ammonia storage tanks as an example, when the temperature of these storage tanks is controlled at 24°C, the pressure of the storage tanks can be controlled at 130 psig. When the temperature of the storage tanks is controlled at 35°C, the pressure of the storage tanks can be controlled. Control at 202psig.

The second gas supply pipe 25 is connected to the storage tank 21 and the gas manifold 1, and a control valve 26 is installed on the second gas supply pipe 25. The second air supply pipes 25 of the storage tanks 21 are connected to the gas manifold 1 at the same angle along the flow direction to prevent the air flows of the second air supply pipes 25 from mutually expelling each other.

The control valve 26 is used to control the flow rate of the second air supply pipe 25 .

The program controller 3 is connected to the floor scales 22 and control valves 26 of the evaporation devices 2 respectively; it controls the opening of the control valves 26 to adjust or close the air supply flow according to the weight information of the storage tanks 21 of the evaporation devices 2 respectively. When the storage tanks 21 are controlled at the same temperature, the storage tanks 21 can theoretically have the same consumption, but in fact there may still be some factors that cause a certain storage tank to consume faster. Therefore, The program controller 3 can control the opening of the control valve 26 of the relatively light storage tank to reduce the air supply flow or close it, so as to achieve the purpose of uniform consumption of the liquefied liquid in the storage tanks 21 . In addition, the program controller 3 can control the flow rate of the control valves 26 of the evaporation devices 2 according to different usage requirements, so as to achieve various purposes, such as achieving the purpose of using up the storage tanks 21 at the same time, or making a single storage tank empty first. When used up, it is easy to replace separately, thereby achieving the purpose of uninterrupted air supply.

A first pressure gauge 12 may be provided on the first air supply pipe 11 to indicate the air supply pressure to facilitate the operator to monitor the operating pressure. The first pressure gauge 12 is used to measure the pressure in the first air supply pipe 11 . The pressure in the first air supply pipe 11 is the air supply pressure provided to the process equipment.

A second pressure alarm 27 is respectively provided on the second air supply pipe 25 of the evaporation devices 2; the second pressure alarm 27 is used to measure the pressure in the second air supply pipe 25 to obtain a second pressure information; The pressure warning device 27 is also connected to the heater 23. When the second pressure information exceeds a predetermined warning pressure, the heating power of the heater will be cut off to stop heating and send out a warning signal, which can improve safety. In addition, the second pressure warning device 27 may also have a pressure display function to facilitate the operator's viewing.

A one-way valve 28 can be provided on the second gas supply pipe 25 of the evaporation devices 2 respectively; the one-way valve 28 limits the gas to be output from the storage tank 21 to the gas manifold 1 . In other words, it is ensured that the gas output from any storage tank 21 will not flow back into other storage tanks 21 .

The storage tanks 21 of the evaporation devices 2 can each be provided with a temperature alarm 29; the temperature alarm 29 is used to measure the temperature of the storage tank 21. The temperature alarm 29 is connected to the heater 23. When the temperature of the storage tank 21 When a predetermined warning temperature is exceeded, the temperature alarm 29 will cut off the power of the heater 23 to stop heating and send out a warning signal.

The warning signals of the aforementioned second pressure warning device 27 and temperature warning device 29 include warning lights and warning sounds.

As mentioned above, the temperature controller 24 is based on the storage tank temperature data. Information control heater 23. According to Charles's law and Boyle's law, the pressure of an ideal gas is directly proportional to the absolute temperature. That is, when the temperature changes by 1°C, the pressure will change by about 1/273 atmosphere. Therefore, the method of controlling the heater by temperature is more complicated than the conventional method. The method of controlling the heater by pressure can more sensitively, accurately and stably control the storage tank to output a predetermined amount of gas at a predetermined pressure. In addition, today's temperature controllers can control the temperature with an accuracy of 0.1°C. Therefore, the method of controlling the heater by temperature is not only sensitive, accurate and stable, but also highly safe.

As mentioned above, the program controller 3 can respectively control the opening of the control valve 26 to adjust the flow rate or close it according to the weight information of the storage tanks of the evaporation devices 2, so as to achieve various purposes. Here are examples as follows.

In the first embodiment, after controlling the temperatures of the storage tanks 21 to the same temperature, the gas output flow rate of the storage tanks 21 can be controlled based on the weight information of the storage tanks 21, so that the storage tanks with relatively light weight can be controlled. The gas output flow rate of the tank is smaller than the gas output flow rate of the relatively heavier storage tank, so that the liquefied liquid in each storage tank is exhausted at the same time, which facilitates the simultaneous replacement of storage tanks and reduces waste.

Figure 4 is a second embodiment of the present invention. As shown in Figure 4, in the second embodiment, after controlling the temperatures of the storage tanks 21 to the same temperature, the gas output flow rate of the storage tanks 21 can be controlled based on the weight information of the storage tanks 21, so that The liquefied liquid in one of the storage tanks is exhausted first, so that the storage tank can be replaced separately to achieve the purpose of uninterrupted gas supply.

The above-mentioned embodiments of the present invention are only for convenience of explanation and should not be used to limit the significance of the present invention. Various transformation designs within the patent scope shall be included in the patent scope of the present invention.

100: Device with multiple tanks for common air supply

1: Gas manifold

11:Air supply pipe

12: First pressure gauge

2: Evaporation device

21:Storage tank

22: Floor scale

23:Heater

25:Second air supply pipe

26:Control valve

27: Second pressure alarm

28: One-way valve

29: Temperature warning device

101: Process equipment

Claims (12)

A multi-tank joint gas supply device that supplies a predetermined amount of gas to a process equipment, including a gas manifold, two or more sets of evaporation devices and a program controller; The gas manifold is provided with a first gas supply pipe connected to the process equipment; The evaporation devices include: a storage tank in which a predetermined amount of liquefied liquid is stored; A floor scale used to measure the weight of the storage tank to obtain weight information of the storage tank; a heater for heating the storage tank; A temperature controller connected to the heater to control the storage tank to maintain a predetermined temperature; a second gas supply pipe connected to the storage tank and the gas manifold; a control valve to control the flow of the second air supply pipe; The program controller is connected to the floor scales and control valves of the evaporation devices respectively; it controls the opening of the control valves to adjust or close the air supply flow according to the weight information of the storage tanks of the evaporation devices. For example, the device of claim 1 for a multi-tank common air supply, wherein the program controller can control the opening of the control valve of the relatively light storage tank to reduce its air supply flow or close it. For example, in the device of claim 1 for a multi-tank common air supply, the program controller can control the control valve based on the weight information of the storage tanks so that the liquefied liquid in one of the storage tanks is exhausted first. For example, the device of claim 1 for a multi-slot common air supply, wherein a first pressure gauge is provided on the first air supply pipe to indicate the air supply pressure to facilitate the operator to monitor the operating pressure. For example, the multi-slot common air supply device of claim 1, wherein the second air supply pipes of the evaporation devices are respectively provided with a second pressure warning device; the second pressure warning device is also connected to the heater, and when the second When the pressure information exceeds a predetermined warning pressure, the heating power of the heater will be cut off to stop heating and a warning signal will be issued. For example, in claim 1, a multi-tank joint gas supply device is provided, in which the second gas supply pipes of the evaporation devices are respectively provided with a one-way valve; the one-way valve restricts the gas output from the storage tank to the gas manifold. For example, the device of claim 1 with multiple tanks for common gas supply, wherein the storage tanks of the evaporation devices are pressure vessels such as cylinders or steel tanks. For example, the multi-tank common air supply device of claim 1 includes a temperature warning device; the temperature warning device is used to measure the temperature of the storage tank; the temperature warning device is connected to the heater; when the temperature of the storage tank exceeds When a predetermined warning temperature is exceeded, the temperature alarm will cut off the power of the heater to stop heating and send out a warning signal. For example, the multi-tank joint air supply device of claim 1, wherein the second air supply pipes are connected to the gas manifold at the same angle along the flow direction to prevent the air flows of the second air supply pipes from mutually expelling each other. A method for jointly supplying gas to multiple tanks, which allows two or more groups of evaporation devices to jointly supply a predetermined amount of gas to a process equipment, which includes the following steps: The temperatures of the storage tanks of the evaporation devices are controlled at the same temperature, so that the storage tanks all output a predetermined amount of gas at the same pressure. For example, the method for jointly supplying gas to multiple tanks in claim 10 includes: controlling the gas output flow rate of the storage tanks based on the weight information of the storage tanks, so that the gas output flow rate of the storage tank with a relatively lighter weight is smaller than that of a storage tank with a relatively heavier weight. The gas output flow rate of the storage tanks is such that the liquefied liquid in each storage tank is exhausted at the same time. For example, the method for jointly supplying gas to multiple tanks in claim 10 includes controlling the gas output flow rate of the storage tanks based on the weight information of the storage tanks so that the liquefied liquid in one of the storage tanks is exhausted first.

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