Hazardous chemical substance filling device and method

Abstract

The invention provides a hazardous chemical substance filling device and method. The device comprises a medicament dissolving unit, a medicament filling unit, a gas pressure feeding unit and a cleaning unit. Wherein the medicament dissolving unit can dissolve the solid medicament in the medicament barrel. The medicine filling unit can fill dissolved medicine into a target device, the medicine filling unit comprises a pipeline connector, a medicine filling pipeline and a medicine adding pump, the first end of the medicine filling pipeline can be connected with the medicine barrel through the pipeline connector, the second end of the medicine filling pipeline can be connected with the target device, and the medicine adding pump is arranged on the medicine filling pipeline. And the gas pressure feeding unit can feed gas into the medicament barrel. The cleaning unit can be used for cleaning the filled medicament barrel. The filling method can be carried out based on the hazardous chemical substance filling device. The device has the beneficial effects of being widely suitable for closed filling of toxic agents in all natural gas purification factories, compact in structure, regular in shape, capable of being integrally transported, easy to move and the like.

Description

Technical Field

[0001] The present invention relates to the field of chemical agent filling, and in particular, to a device and method for filling dangerous chemicals. Background Art

[0002] All along, the most widely used process for the purification treatment of sulfur-containing natural gas is the MDEA solvent method. The core solvent of this process is MEDA, with a concentration range of 40%-45%, and the rest is water. With the release and implementation of the new national standard "Natural Gas" (GB17820-2018), since January 1, 2021, a new natural gas quality standard will be implemented. The deep treatment process of sulfur-containing natural gas has been developed and promoted. Among them, a combined solvent system of piperazine, sulfolane, and MDEA is used more frequently and has been successfully applied. This solvent system will adjust the concentration according to the gas quality components of the raw material gas, so it is necessary to carry out the configuration of the solvent and the adjustment operation of the solution concentration.

[0003] At normal temperature and low temperature, both piperazine and sulfolane agents are in solid state and are toxic substances. When filling the agents on-site, the piperazine agent and sulfolane agent are melted by means of a hot water bath, which requires connecting multiple temporarily set production units. There are many single devices and they are scattered in layout, resulting in a large working intensity. During the whole process, the agent vapor can leak out through the solvent barrel mouth. Employees need to strictly wear chemical protection work clothes and wear air respirators for operation, which is inconvenient to operate and there are still operation risks.

[0004] Currently, there is no dedicated device for agent filling. For example, the invention patent with the application number CN201510771771.5 discloses a mobile solid dangerous chemical filling device. This patent mainly solves the problem of floating outwards during the filling process of solid dangerous chemicals, and includes a first tank body, and a tree-shaped distribution pipe, a rotating hub, and a sieve plate arranged in sequence from top to bottom; wherein, a sealing cover is provided at the opening of the first tank body, the tree-shaped distribution pipe fills liquid formulation, the rotating hub runs across the first tank body, blades are arranged on the outer side of the rotating hub, and the blades are driven to rotate with the rotating hub by a hand crank arranged on the outer side. During the specific filling process, a packaging bag containing solid dangerous chemicals is put into the first tank body with a towing rope, the sealing cover is closed, the rotating hub is driven, the packaging bag is cut open with the blade, so that the solid dangerous chemicals automatically fall into the first tank body, and then the tree-shaped distribution pipe is used for flushing. Obviously, this patent is aimed at the filling of solid dangerous chemicals and is not applicable to the production process that requires the conversion of dangerous chemicals from solid state to liquid state for filling. Summary of the Invention

[0005] The object of the present invention is to solve at least one of the above deficiencies existing in the prior art. One of the objects of the present invention is to provide a method for realizing the closed filling of the entire hazardous chemical agent, ensuring that no toxic and harmful substances spill out during the filling process, and protecting the health of employees and the environment; the second object is to improve the convenience of filling the hazardous chemical agent and shorten the production process.

[0006] To achieve the above object, on the one hand, the present invention provides a filling device for hazardous chemicals.

[0007] The device may include: a chemical agent dissolving unit, a drug filling unit, a gas pumping unit, and a cleaning unit; wherein, the chemical agent dissolving unit can dissolve the solid chemical agent in the chemical agent barrel; the drug filling unit can fill the dissolved chemical agent into the target device. The drug filling unit includes a pipeline joint, a drug injection pipeline, and a dosing pump. The first end of the drug injection pipeline can be connected to the chemical agent barrel through the pipeline joint, and the second end can be connected to the target device. The dosing pump is arranged on the drug injection pipeline; the gas pumping unit can send gas into the chemical agent barrel; the cleaning unit can clean the chemical agent barrel after filling.

[0008] Further, the chemical agent dissolving unit may include at least one set of heating components, and the heating components include a heating jacket and a steam pipeline connected to each other.

[0009] Further, the heating components may further include a buckle for fixing the chemical agent barrel; a pneumatic regulating valve is arranged on the steam pipeline, and the steam amount can be adjusted through the pneumatic valve, thereby adjusting the heating temperature of the heating jacket.

[0010] Further, the device may further include a heat recovery and utilization unit, which can recover the heat overflowing from the heating components and use this heat to heat the cleaning substance used by the cleaning unit.

[0011] Further, a flow meter may be arranged on the drug injection pipeline.

[0012] Further, the chemical agent dissolving unit may further include a thermostat.

[0013] Further, the cleaning unit may include a water washing tank, a chemical agent tank, a cleaning joint, a cleaning pipeline, and a valve; wherein, the cleaning pipeline and the cleaning joint can connect the water washing tank and the chemical agent tank to the chemical agent barrel; the valve is arranged on the cleaning pipeline.

[0014] Further, the device may further include a flipping unit, and the flipping unit includes at least one lifting and flipping machine, which can flip the chemical agent barrel; and / or, the device further includes a skid base.

[0015] Furthermore, the device is applicable to the closed injection of toxic agents in natural gas purification plants; and / or, the solid agent may include: piperazine or sulfolane.

[0016] On the other hand, the present invention provides a method for injecting chemical agents.

[0017] The injection method can be carried out based on the hazardous chemical injection device described above.

[0018] Compared with the prior art, the beneficial effects of the present invention include at least one of the following:

[0019] (1) The present invention can be widely applied to the closed injection of toxic agents in all natural gas purification plants. The formed product can meet the requirements of the closed dissolution and injection of hazardous chemical solid solvents in natural gas purification plants. While ensuring the health protection of personnel and safe production during the injection process, it can realize the prefabrication of solvents in advance.

[0020] (2) Each functional module of the injection system of the present invention is highly integrated, reducing the floor area of the device.

[0021] (3) The overall skid-mounted device of the present invention has the characteristics of compact structure, regular shape, small floor area, integral transportation, easy relocation, etc. It is easy to form standardization and serialization. The formed product can meet the requirements of various working conditions for agent injection, realize prefabrication in advance, shorten the on-site construction period, improve working conditions, and accelerate the progress of production capacity construction, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Through the following description in conjunction with the drawings, the above and other objects and features of the present invention will become clearer, wherein:

[0023] Figure 1 Shows the overall device schematic diagram of the hazardous chemical injection device of an exemplary embodiment of the present invention;

[0024] Figure 2 Shows the overall device structure diagram of the hazardous chemical injection device of an exemplary embodiment of the present invention;

[0025] Figure 3 Shows the connection schematic diagram of each component unit of the hazardous chemical injection device of an exemplary embodiment of the present invention;

[0026] Figure 4 Shows the operation step flow chart of an exemplary embodiment of the present invention.

[0027] Description of the reference numerals:

[0028] 1 - Agent dissolution unit, 11 - Agent barrel; 12 - Heating assembly, 121 - Heating jacket; 122 - Steam pipeline; 123 - Fastening piece; 13 - Temperature controller;

[0029] 2 - Drug filling unit; 21 - Drug injection pipeline joint; 22 - Drug injection pipeline; 23 - Drug addition pump;

[0030] 3 - Gas pressure - sending unit; 31 - Gas joint; 32 - Gas pipeline;

[0031] 4 - Cleaning unit, 41 - Water washing tank; 42 - Chemical agent tank; 43 - Cleaning joint; 44 - Cleaning pipeline;

[0032] 51 - Control panel, 52 - Hand - operated valve; a - Valve;

[0033] 6 - Skid base;

[0034] A - Low - pressure steam inlet; B - Chemical agent outlet; C - Plant air inlet; D - Nitrogen inlet; E - Exhaust gas outlet; F - Water inlet; G - First sewage outlet; H - Recovery tank sewage outlet; I - Second sewage outlet. Detailed implementation mode

[0035] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the present invention.

[0036] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present application.

[0037] The terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise stated, the meaning of "plural" is two or more.

[0038] In the description of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0039] Exemplary Embodiment 1

[0040] This exemplary embodiment provides a hazardous chemical filling device, which can also be referred to as a hazardous chemical filling skid-mounted device.

[0041] Figure 1 The overall device schematic of the hazardous chemical filling device of the present invention is shown. Figure 2 The overall device structure diagram of the hazardous chemical filling device of the present invention is shown. Figure 3 The connection schematic diagram of each component unit of the hazardous chemical filling device of the present invention is shown; wherein, A is the low-pressure steam inlet, B is the chemical agent outlet, C is the plant air inlet, D is the nitrogen inlet, E is the waste gas outlet, F is the water inlet, G is the first sewage discharge port, H is the recovery tank sewage discharge port, and I is the second sewage discharge port.

[0042] As Figure 1 shown, the device may include: a chemical agent dissolution unit 1, a drug filling unit 2, a gas pressure feeding unit 3, and a cleaning unit 4.

[0043] The chemical agent dissolution unit 1 can make Figure 2 the solid chemical agent in the chemical agent barrel 11 shown dissolve.

[0044] The drug filling unit 2 can fill the dissolved chemical agent into the target device. The drug filling unit includes a drug injection pipeline joint 21, a drug injection pipeline 22, and a drug addition pump 23. The first end of the drug injection pipeline 22 can be connected to the chemical agent barrel 11 through the drug injection pipeline joint 21, and the second end can be connected to the target device. The drug addition pump 23 is arranged on the drug injection pipeline 22.

[0045] The gas pressure feeding unit 3 can send gas into the chemical agent barrel 11.

[0046] The cleaning unit 4 can clean the chemical agent barrel 11 after filling.

[0047] Integrate the three joints of the drug injection pipeline joint 21, the gas joint 31, and the cleaning joint 43 into the same joint, connect them to the same interface, and connect them to the chemical agent barrel 11.

[0048] In this embodiment, the drug dissolution unit 1 may include at least one set of heating components 12. The heating components 12 include a heating jacket 121 and a steam pipeline 122 connected to each other. Among them, the heating jacket 121 can clamp the chemical agent barrel 11, and the heating temperature does not exceed 80 degrees (barrel wall). A valve a may be provided on the steam pipeline 122.

[0049] Furthermore, the drug dissolution unit 1 may further include a temperature measurement component for measuring the temperature of the barrel wall. The temperature measurement component may include a thermometer.

[0050] Further, a chain wrench and a temperature control measurement hoop may be provided on the heating jacket 121. After slowly placing the chemical agent barrel 11 into the heating jacket 121, the chain wrench and the temperature control measurement hoop need to be fixed well.

[0051] In this embodiment, the heating assembly 12 may further include a buckle member 123 for fixing the chemical agent barrel.

[0052] In this embodiment, a pneumatic regulating valve is provided on the steam pipeline 122. The steam amount can be adjusted through the pneumatic valve, and then the heating temperature of the heating jacket 121 can be adjusted.

[0053] In this embodiment, the device may further include a heat recovery and utilization unit. The heat recovery and utilization unit can recover the heat overflowing from the heating assembly and use this heat to heat the cleaning substance utilized by the cleaning unit.

[0054] In this embodiment, a flow meter may be provided on the chemical agent injection pipeline 22. A valve is provided on the chemical agent injection pipeline.

[0055] In this embodiment, the chemical agent adding pump 23 includes a pneumatic diaphragm pump with an air pump or the instrument air system supporting the natural gas purification plant as the power source for such injection.

[0056] In this embodiment, the chemical agent dissolution unit further includes a thermostat 13.

[0057] In this embodiment, the cleaning unit may include a water washing tank 41, a chemical agent tank 42, a cleaning joint 43, a cleaning pipeline 44 and a valve; wherein, the cleaning pipeline 44 and the cleaning joint 43 can connect the water washing tank 41 and the chemical agent tank 42 with the chemical agent barrel 11; the valve is provided on the cleaning pipeline 44. The valve can control the opening and closing of the cleaning pipeline 44.

[0058] In this embodiment, the cleaning unit may further include a control panel 51 and a plurality of hand-operated valves 52 ( Figure 2 shown) installed on the control panel for controlling various pipelines. Among them, when the hand-operated valve 52 is turned to the "open" position, the corresponding valve (such as the pneumatic valve) opens. If the valve needs to be closed, the hand-operated valve 52 should be turned to the emptying position and stay for enough time. After emptying the air in the relevant valve pipeline, then turn the hand-operated valve 52 to the "closed" position.

[0059] In this embodiment, the device may further include a flipping unit. The flipping unit includes at least one lifting and flipping machine. The lifting and flipping machine can flip the chemical agent barrel and can also push the flipped chemical agent barrel back into the jacket.

[0060] In this embodiment, the device further includes as Figure 2The shown pry base 6 can be a movable and detachable structure. For example, wheels can be provided at the bottom of the pry base 6, and when there is sufficient traction, the pry can move on flat ground, achieving the utilization rate of the plant area space.

[0061] In this embodiment, the device is applicable to the closed filling of toxic agents in a natural gas purification plant, and / or, the solid agent includes: piperazine or sulfolane.

[0062] This device is a non-electric device, and all heating facilities, instruments, and valves are operated without electricity. Only by externally connecting steam, water, instrument air, and nitrogen can the device operate normally. Wheels are provided at the bottom of the pry, and when there is sufficient traction, the pry can move on flat ground, achieving a high utilization rate of the plant area space.

[0063] When this device works, it uses the steam in the plant area to heat the barrel through jacket heat exchange to melt the agent solution in the barrel, and then transports the agent solution to the designated area through the medicine injection pipeline. After the transportation is completed, the barrel can also be cleaned. This device can process four barrels of 200L agents simultaneously.

[0064] This device is also equipped with a thermostat and a pneumatic control valve, which can achieve precise control of the steam heating temperature. At the same time, an energy-saving device is also provided to use the inner and outer discharged steam of the jacket to heat the water in the water washing tank for the supply of hot water when cleaning the barrel. A flow meter is provided on the medicine pipeline to monitor whether the externally transported solution has been transported completely. When the set flow rate is reached, the dosing pump stops working, and the device enters the cleaning and sewage discharge process manually.

[0065] Exemplary Embodiment 2

[0066] This exemplary embodiment provides a method for filling hazardous chemicals.

[0067] This method uses the hazardous chemical filling device described in Exemplary Embodiment 1.

[0068] This method designs a medicine filling process flow. The hazardous chemical medicine barrel is connected to a quick interface, heated and melted through a set steam jacket, and then filled into the target device by a dosing pump through a medicine injection pipeline.

[0069] The filling process of this method can include:

[0070] Transport the device to the side of the device that needs medicine filling. The access of steam, nitrogen, and plant air media can be completed through the Figure 3 shown low-pressure steam inlet A, nitrogen inlet D, and plant air inlet C. Nitrogen is used to maintain a certain positive pressure in the barrel and play a role in pressure transmission. The plant air is the on-site compressed air (for example, 0.7 MPa) and serves as the power air source for various valves and air pumps.

[0071] When the barreled chemical agent is sent to the device operation area, unscrew the sealing cap of the chemical agent barrel, install the quick connector assembly (i.e., the medicine injection pipeline joint, gas joint, and cleaning joint), and operate the flipping unit to place the barrel face up on carts No. 1, 2, 3, and 4. Push the cart to slowly move the barrel into the heating jacket, and fix the buckle and the temperature controller.

[0072] After all four barrels are securely fixed in the jacket, start the steam heating. The steam volume and the surface temperature of the barrel form cascade control to control the heating temperature. Therefore, no personnel are required to be on duty during heating, and the heating device can automatically control the opening and closing of the heating valve according to the heating process.

[0073] When the heating duration or temperature reaches the heating requirement, the operator uses the flipping unit to flip the barrel and then push it into the jacket again. Then, the operator can operate the on-site control panel to turn on the medicine adding pump. A flow meter is installed in the adding pipeline to measure the amount of the added chemical agent in real time. When the set value is reached, stop adding the medicine and switch to the pipeline cleaning function.

[0074] Start the clean water pump to clean the chemical agent barrel. After cleaning, remove the joint assembly and place the barrel from the cart to the ground to complete the entire addition of the chemical agent.

[0075] When not in use, the hose of the joint assembly is inserted into the joint in the pipeline storage area at the edge of the skid.

[0076] Exemplary Embodiment 3

[0077] This embodiment provides a method for adding piperazine.

[0078] The following will be combined with Figures 1 to 4 to illustrate the method for adding piperazine. This method mainly includes the following steps:

[0079] I. Preparation before operation

[0080] 1). The water washing tank 41 and the chemical agent tank 42 are filled with 80% demineralized water. The function of the demineralized water is to clean the chemical agent barrel. After cleaning, the chemical agent tank 42 can transport the chemical agent back to the chemical agent barrel 11. The chemical agent tank 42 is connected to the quick interface through the bottom cleaning pump for cleaning the chemical agent barrel 11. After being cleaned, the chemical agent barrel 11 can be directly connected to the device system or can be recycled back to the chemical agent tank 42.

[0081] 2). The piperazine chemical agent barrel 11 is transported to the chemical agent dissolution area, and the sealing caps at the inlet and outlet are removed.

[0082] 3). Connect the medicine injection pipeline 22. The first end of the medicine injection pipeline 22 can be connected to the piperazine chemical agent barrel 11 through the pipeline joint, and the second end can be connected to the target device.

[0083] II. Clamp the piperazine barrel into the jacket

[0084] 1), Place the piperazine barrel on the flat plate of the trolley in the skid (adjust the position of the hose to be consistent with the notch on the trolley flat plate).

[0085] 2), Push the trolley to send the piperazine barrel into the heating jacket 121 and fix it manually.

[0086] 3), Press the thermostat 13 and the thermometer tightly against the barrel wall. In this embodiment, the thermostat is the T12 thermostat.

[0087] 4), Adjust the heating temperature (80 °C) with the control knob of the thermostat.

[0088] III. Steam heating process

[0089] The steam heating process can be entered through manual operation.

[0090] 1), Open the valve of the steam pipeline 122.

[0091] 2), The heating duration reaches the specified duration (the duration can be determined according to the operating conditions).

[0092] 3), Observe the temperature: Observe the thermometer on the barrel wall, and the displayed temperature should not be less than 45 °C and not greater than 80 °C. If the temperature is too low, piperazine cannot be dissolved; if the temperature is too high, it will cause thermal decomposition of piperazine vapor to produce irritating gases.

[0093] IV. Drug filling process

[0094] 1), Open the valve of the drug filling unit 2.

[0095] 2), Reach the set duration and flow rate (the cumulative flow rate reaches the total volume of 4 barrels).

[0096] 3), Close the valve.

[0097] V. Piperazine barrel cleaning process

[0098] The piperazine barrel cleaning process can be entered through manual operation.

[0099] 1), Open the valve of the cleaning unit 4.

[0100] 2), Circulate and rinse for a certain duration (the duration is determined by oneself).

[0101] 3), Close the valve.

[0102] VI. Piperazine barrel sewage discharge process

[0103] The piperazine barrel sewage discharge process can be entered through manual operation.

[0104] 1), Open the sewage discharge valve.

[0105] 2), Discharge sewage for a certain duration (the duration is determined by oneself).

[0106] 3), Close the valve of the cleaning unit 4.

[0107] 4), Close the blowdown valve.

[0108] 5), Close the valve of the steam pipeline 122 and stop the steam input.

[0109] VII. Disassemble the empty piperazine barrel

[0110] The empty piperazine barrel can be disassembled manually.

[0111] 1), Check whether all valves are closed.

[0112] 2), Remove the piperazine reagent barrel from the jacket.

[0113] 3), Remove the medicine injection pipeline joint 21, gas joint 31 and cleaning joint 43 from the piperazine barrel.

[0114] 4), Place the pipeline joint in the centralized storage area on the side of the skid.

[0115] VIII. Shut down the piperazine skid

[0116] The piperazine skid can be shut down manually.

[0117] 1), Drain the residual steam in the jacket and steam pipeline of the skid.

[0118] 2), Clean the operation area to keep it tidy.

[0119] 3), Check that the buckle 123, heating jacket 121, temperature controller 13, etc. are fixed well in the jacket without shaking.

[0120] In summary, the advantages of the hazardous chemical filling device and method of the present invention may include: The present invention can be widely applied to the closed filling of toxic chemicals (such as desulfurization solvents) in all natural gas purification plants, ensuring personnel labor protection and safe production during the filling process. Each functional module of the filling system of the present invention is highly integrated, reducing the floor area of the device. The overall skid-mounted device of the present invention has the characteristics of compact structure, regular shape, integral transportation, easy relocation, etc., and is easy to form standardization and serialization. The formed products can meet the requirements of various working conditions for chemical filling, realize prefabrication in advance, shorten the on-site construction period, improve working conditions, and accelerate the progress of production capacity construction.

[0121] Although the present invention has been described above by combining exemplary embodiments, those skilled in the art should clearly understand that various modifications and changes can be made to the exemplary embodiments of the present invention without departing from the spirit and scope defined by the claims.

Claims

1. A hazardous chemical filling device, characterized in that, The device includes: a medicament dissolution unit, a drug injection unit, a gas delivery unit, and a cleaning unit; wherein, The medicament dissolution unit can dissolve the solid medicament in the medicament barrel; The drug injection unit can inject the dissolved medicament into the target device. The drug injection unit includes a pipeline connector, an injection pipeline, and a dosing pump. The first end of the injection pipeline can be connected to the medicament barrel through the pipeline connector, and the second end can be connected to the target device. The dosing pump is arranged on the injection pipeline; The gas delivery unit can send gas into the medicament barrel; The cleaning unit can clean the medicament barrel after injection.

2. The hazardous chemical filling device according to claim 1, wherein The medicament dissolution unit may include at least one heating component, and the heating component includes a heating jacket and a steam pipeline connected to each other.

3. The hazardous chemical filling device according to claim 2, wherein, The heating component further includes a buckle for fixing the medicament barrel; a pneumatic regulating valve is arranged on the steam pipeline, and the steam volume can be adjusted through the pneumatic valve, so as to adjust the heating temperature of the heating jacket.

4. The hazardous chemical filling device according to claim 2, wherein, The device may further include a heat recovery and utilization unit, which can recover the heat overflowing from the heating component and use the heat to heat the cleaning substance used by the cleaning unit.

5. The hazardous chemical filling device according to claim 1, wherein A flow meter is arranged on the injection pipeline.

6. The hazardous chemical filling device according to claim 1, characterized in that, The medicament dissolution unit further includes a thermostat.

7. The hazardous chemical filling device according to claim 1, characterized in that, The cleaning unit includes a water washing tank, a medicament tank, a cleaning connector, a cleaning pipeline, and a valve; wherein, The cleaning pipeline and the cleaning connector can communicate the water washing tank and the medicament tank with the medicament barrel; the valve is arranged on the cleaning pipeline.

8. The hazardous chemical filling device according to claim 1, wherein, The device further includes a turning unit, and the turning unit includes at least one lifting and turning machine, which can turn the medicament barrel; and / or, The device further includes a skid base.

9. The hazardous chemical filling device according to claim 1, characterized in that, The device is applicable to the closed injection of toxic medicaments in a natural gas purification plant; and / or, The solid medicament includes: piperazine or sulfolane.

10. A method for filling dangerous chemicals, characterized in that, The injection method can be carried out based on the hazardous chemical injection device according to any one of claims 1 to 9.

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