A large horizontal ammonium nitrate solution storage tank

Abstract

The present invention relates to a large horizontal ammonium nitrate solution storage tank, which comprises a tank body, as well as a feed inlet, a discharge outlet, a heating mechanism and a rain shower mechanism arranged on the tank body. A reflux circulation mechanism is further arranged in the tank body. The reflux circulation mechanism is composed of a plurality of groups of reflux circulation components arranged along the height direction of the tank body. Each group of reflux circulation components consists of two reflux circulation pipes installed diagonally in the axial direction of the tank body. One end of each reflux circulation pipe extends out of the tank body and is connected to an external reflux pipeline. The reflux pipeline is also connected to the feed inlet and is used to circulate part of the material discharged from the discharge outlet into the tank body through the reflux circulation pipes. The outlets of the two reflux circulation pipes in the same group of reflux circulation components are not on the same straight line. Compared with the prior art, the present invention can improve the concentration uniformity of the solution in the tank, operate safely and reliably, and have a low maintenance rate, etc.

Description

Technical Field

[0001] The present invention belongs to the technical field of chemical equipment and relates to a large horizontal ammonium nitrate solution storage tank. Background Art

[0002] The civil explosive industry is a basic industry in our industrial system, an important support for industries such as coal mines, mining, construction, and transportation, and shoulders an important mission to serve the national economic construction. With the continuous development of the national economic construction, the requirements for work safety and environmental protection are constantly increasing, and the sustainable utilization of limited resources has put forward higher requirements for the production process and cost of industrial explosives. To promote the scientific development of the civil explosive industry, accelerate the pace of eliminating backward production capacity, and achieve safe development, clean development, and conservation development, the Ministry of Industry and Information Technology has issued the "Guiding Opinions of the Ministry of Industry and Information Technology on the Technological Progress of the Civil Explosive Industry" (MIIT Safety

[2010] No. 227), which puts forward guiding opinions on the technological development direction, technological development goals, and restricted and eliminated technologies in the civil explosive industry. Among them, it is clearly proposed in the technological development direction that "using liquid ammonium nitrate instead of solid ammonium nitrate to prepare industrial explosives". In recent years, in order to conform to the spirit of the national civil explosive industry's industrial policy development direction, more and more civil explosive enterprises have begun to try to use liquid ammonium nitrate as a raw material to prepare industrial explosives.

[0003] The use of ammonium nitrate solution as a large amount of production raw materials has become the mainstream production mode. How to safely store ammonium nitrate solution has become an important part of work safety. A storage tank is a container used to store industrial production raw materials such as liquids or gases and is an important infrastructure.

[0004] Most of the existing storage tanks are vertical ammonium nitrate solution storage tanks. Different from small vertical solution storage tanks, for large vertical ammonium nitrate solution storage tanks, factors such as wind load and hydraulic pressure need to be considered, and the risk factors are relatively large, and the installation requirements are high. At the same time, ammonium nitrate solution is prone to crystallization, so a heating device needs to be equipped inside the storage tank to prevent the precipitation of ammonium nitrate crystals. Due to the structural characteristics of the vertical container, in order to ensure uniform heating of the liquid, multiple layers of heating coils need to be arranged in the height direction of the container, thus increasing the equipment cost and leakage risk. The ammonium nitrate solution needs to be maintained within a certain temperature range, so the equipment needs to be equipped with a rain shower device to play a role in cooling when the temperature of the storage tank gets out of control. In a vertical container, the rain shower device is installed above the heating tube of the vertical container. Due to the structural characteristics of the container, the vertical container has the disadvantages of small rain shower contact area, poor cooling effect, and uneven solution concentration. The rain shower device of the vertical storage tank is installed inside the equipment, reducing the effective volume of the solution and increasing the safety risk. Summary of the Invention

[0005] The purpose of the present invention is to provide a large horizontal ammonium nitrate solution storage tank to improve the energy-saving, safety, and stability performance of the storage tank.

[0006] The object of the present invention can be achieved by the following technical solutions:

[0007] A large horizontal ammonium nitrate solution storage tank, comprising a tank body, and a feed inlet, a discharge outlet, a heating mechanism and a rain shower mechanism arranged on the tank body. A reflux circulation mechanism is further arranged in the tank body. The reflux circulation mechanism is composed of a plurality of groups of reflux circulation components arranged along the height direction of the tank body. Each group of reflux circulation components is composed of two reflux circulation pipes installed diagonally in the axial direction of the tank body. One end of each reflux circulation pipe extends out of the tank body and is connected to an external reflux pipeline. The reflux pipeline is also connected to the feed inlet and is used to circulate part of the material discharged from the discharge outlet back into the tank body through the reflux circulation pipes. The outlets of the two reflux circulation pipes in the same group of reflux circulation components are not on the same straight line.

[0008] Further, the outlet of the reflux circulation pipe is processed into a bent structure.

[0009] Further, the outlet of the reflux circulation pipe is bent at 45°.

[0010] Further, the two reflux circulation pipes in the same group of reflux circulation components are at the same height along the height direction of the tank body.

[0011] Further, there are two groups of the reflux circulation components.

[0012] Further, the heating mechanism is composed of several layers of steam heating pipes installed in the tank body. Both ends of each layer of steam heating pipes are respectively connected to an external steam supply system.

[0013] Still further, there are three layers of the steam heating pipes.

[0014] Further, the rain shower mechanism includes several rain shower nozzles placed in the tank body, and a cooling water pipeline located outside the tank body and connected to the rain shower nozzles.

[0015] Further, a feed pipe inserted into the lower region of the tank body is connected to the feed inlet.

[0016] Furthermore, a liquid level gauge port and a thermometer port are also provided at the top of the tank body. A liquid level gauge extending into the interior of the tank body is installed at the liquid level gauge port, and a thermometer for measuring the temperature inside the tank body is installed at the thermometer port. At the same time, the entire storage tank also includes a control system (a PLC system can be selected), which can realize temperature and / or liquid level interlock control for the heating mechanism, the rain shower mechanism, the reflux circulation mechanism, etc. Specifically, (1) Temperature and liquid level interlock control is adopted for the heating mechanism. When the temperature is too high, the system will alarm and automatically adjust the valve opening to keep the solution temperature within a constant range. When the liquid level is too low, to prevent the steam heating pipe from being exposed and continuously heating up, the heating system will automatically alarm and close the valve. (2) System temperature interlock control is adopted for the rain shower mechanism. When the system temperature is too high, the system will alarm and automatically open the rain shower mechanism, and the rain shower cannot be closed unless manually cut off water or power. (3) Liquid level interlock control is adopted for each layer of reflux circulation components respectively. When the liquid level is lower than the reflux circulation pipe, the system will automatically close the valve of the reflux circulation pipeline at the corresponding position to adjust the system flow rate.

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] (1) Energy saving: The height of the horizontal container is lower than that of the vertical container, the required head of the inlet feeding pump is low, the pump power is small, the energy consumption is low, and the cost is more advantageous. The number of layers of the heating coil is small, and the reflux stirring increases the heat transfer coefficient, with high heat transfer efficiency and low energy consumption.

[0019] (2) High safety: By arranging the liquid level gauge and the thermometer, and cooperating with the control system (such as the PLC system) and the valves set on the corresponding pipelines, temperature / liquid level dual interlock control of the system can be realized, effectively reducing the possibility of hazards caused by too high system temperature and leakage.

[0020] (3) Good stability: The reflux circulation mechanism can promote the stable flow of the fluid, play a role in stirring and mixing, ensure the uniformity of the fluid concentration and temperature, and at the same time increase the heat transfer efficiency. At the same time, the setting of traditional stirring equipment is also omitted. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic diagram of the main structure of the present invention;

[0022] Figure 2 is a cross-sectional view of the present invention;

[0023] Description of the reference numerals in the drawings:

[0024] 1 - steam heating pipe, 2 - reflux circulation pipe, 3 - discharge port, 4 - support, 5 - fixed support member, 6 - feed port, 7 - safety valve port, 8 - liquid level gauge port, 9 - rain shower mechanism, 10 - thermometer port, 11 - tank body. DETAILED DESCRIPTION OF THE INVENTION

[0025] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is implemented on the premise of the technical solution of the present invention, and the detailed implementation manners and specific operation processes are given. However, the protection scope of the present invention is not limited to the following embodiments.

[0026] In the following embodiments or examples, if there is no special description of the functional components or structures, it means that they are all conventional components or structures in the art for implementing the corresponding functions.

[0027] The present invention provides a large horizontal ammonium nitrate solution storage tank, the structure of which is shown in Figure 1 and Figure 2 and includes a tank body 11, and a feed inlet 6, a discharge outlet 3, a heating mechanism and a rain shower mechanism 9 provided on the tank body 11. A reflux circulation mechanism is further provided in the tank body 11. The reflux circulation mechanism is composed of a plurality of groups of reflux circulation components arranged along the height direction of the tank body 11. Each group of reflux circulation components is composed of two reflux circulation pipes 2 installed diagonally in the axial direction of the tank body 11. One end of the reflux circulation pipe 2 extends out of the tank body 11 and is connected to an external reflux pipeline. The reflux pipeline is also connected to the feed inlet 6 and is used to circulate part of the material discharged from the discharge outlet 3 into the tank body 11 through the reflux circulation pipe 2. The outlets of the two reflux circulation pipes 2 in the same group of reflux circulation components are not on the same straight line.

[0028] In a specific embodiment, please refer to Figure 2 again. The outlet of the reflux circulation pipe 2 is processed into a bent structure.

[0029] In a specific embodiment, please refer to Figure 2 again. The outlet of the reflux circulation pipe 2 is bent at 45°.

[0030] In a specific embodiment, please refer to Figure 2 again. The two reflux circulation pipes 2 in the same group of reflux circulation components are at the same height along the height direction of the tank body 11.

[0031] In a specific embodiment, there are two groups of the reflux circulation components.

[0032] In a specific embodiment, please refer to Figure 2 again. The heating mechanism is composed of several layers of steam heating pipes 1 installed in the tank body 11. Both ends of each layer of steam heating pipes 1 are respectively connected to an external steam supply system. Further, there are three layers of the steam heating pipes 1.

[0033] In a specific embodiment, please refer to Figure 1As shown, the rain shower mechanism 9 includes a number of rain shower nozzles placed inside the tank body 11, and a cooling water pipeline located outside the tank body 11 and connected to the rain shower nozzles.

[0034] In a specific embodiment, please refer to Figure 1 As shown, a feed pipe inserted into the lower region of the tank body 11 is connected to the feed inlet 6.

[0035] In a specific embodiment, please refer to Figure 1 As shown, a liquid level gauge port 8 and a thermometer port 10 are further provided at the top of the tank body 11. A liquid level gauge extending into the interior of the tank body 11 is installed at the liquid level gauge port 8, and a thermometer for measuring the internal temperature of the tank body 11 is installed at the thermometer port 10. At the same time, the entire storage tank further includes a control system (a PLC system can be selected), which can realize temperature and / or liquid level interlock control for the heating mechanism, the rain shower mechanism 9, the reflux circulation mechanism, etc. Specifically, (1) temperature and liquid level interlock control is adopted for the heating mechanism. When the temperature is too high, the system will alarm and automatically adjust the valve opening to keep the solution temperature within a constant range; when the liquid level is too low, to prevent the harm of continuous heating of the steam heating pipe 1 being exposed, the heating system will automatically alarm and close the valve; (2) system temperature interlock control is adopted for the rain shower mechanism 9. When the system temperature is too high, the system will alarm and automatically open the rain shower mechanism 9. Unless manually cut off water or power, the rain shower cannot be closed; (3) liquid level interlock control is adopted for each layer of the reflux circulation component respectively. When the liquid level is lower than the reflux circulation pipe 2, the system will automatically close the valve of the reflux circulation pipe 2 at the corresponding position to adjust the system flow rate.

[0036] The above embodiments can be implemented separately, or any two or more of them can be combined.

[0037] The above embodiments will be described in more detail below in combination with specific embodiments.

[0038] Example 1:

[0039] This example proposes a large horizontal ammonium nitrate solution storage tank, the structure of which is shown in Figure 1 and Figure 2As shown in the figure, it includes a tank body 11 supported by a support 4, and a feed inlet 6, a discharge outlet 3, a heating mechanism and a rain shower mechanism 9 arranged on the tank body 11. A reflux circulation mechanism is also arranged in the tank body 11. The reflux circulation mechanism is composed of two groups of reflux circulation components arranged along the height direction of the tank body 11. Each group of reflux circulation components is composed of two reflux circulation pipes 2 installed diagonally in the axial direction of the tank body 11. One end of the reflux circulation pipe 2 extends out of the tank body 11 and is connected to an external reflux pipeline. The reflux pipeline is also connected to the feed inlet 6 and is used to circulate part of the material discharged from the discharge outlet 3 into the tank body 11 through the reflux circulation pipe 2. The outlets of the two reflux circulation pipes 2 in the same group of reflux circulation components are not on the same straight line.

[0040] Please refer to again Figure 2 As shown in the figure, the outlet of the reflux circulation pipe 2 is processed into a bent structure, preferably bent at 45°.

[0041] Please refer to again Figure 2 As shown in the figure, the two reflux circulation pipes 2 in the same group of reflux circulation components are at the same height along the height direction of the tank body 11.

[0042] Please refer to again Figure 2 As shown in the figure, the heating mechanism is composed of three layers of steam heating pipes 1 installed in the tank body 11 from top to bottom. Both ends of each layer of steam heating pipe 1 are respectively connected to an external steam supply system. The steam heating pipe 1 is fixedly installed in the tank body 11 through a fixed support 5.

[0043] Please refer to again Figure 1 As shown in the figure, the rain shower mechanism 9 includes several rain shower nozzles placed in the tank body 11 and a cooling water pipeline located outside the tank body 11 and connected to the rain shower nozzles.

[0044] Please refer to again Figure 1 As shown in the figure, a feed pipe inserted into the lower area of the tank body 11 is connected to the feed inlet 6 to reduce the impact on the inside of the tank during feeding.

[0045] Please refer to again Figure 1 As shown in the figure, a liquid level gauge port 8, a thermometer port 10 and a safety valve port 7 are also provided at the top of the tank body 11. A liquid level gauge extending into the inside of the tank body 11 is installed at the liquid level gauge port 8, and a thermometer for measuring the internal temperature of the tank body 11 is installed at the thermometer port 10. At the same time, the entire storage tank also includes a control system (a PLC system can be selected), which can realize temperature and / or liquid level interlock control of the heating mechanism, the rain shower mechanism 9 and the reflux circulation mechanism, etc. Specifically:

[0046] (1) The heating mechanism is controlled by temperature and liquid level interlocks. When the temperature is too high, the system will alarm and automatically adjust the valve opening to keep the solution temperature within a constant range; when the liquid level is too low, to prevent the steam heating pipe 1 from being exposed and continuously heating up, the heating system will automatically alarm and close the valve. (2) The rain shower mechanism 9 is controlled by the system temperature interlock. When the system temperature is too high, the system will alarm and automatically open the rain shower mechanism 9, and the rain shower cannot be closed unless manually cut off water or power. (3) Each layer of the reflux circulation component is controlled by the liquid level interlock. When the liquid level is lower than the reflux circulation pipe 2, the system will automatically close the valve of the reflux circulation pipe 2 at the corresponding position to adjust the system flow rate.

[0047] During operation, the storage tank is connected to the subsequent process system and provides a stable ammonium nitrate solution to the reaction tank in the process system. At this time, the heating mechanism and the reflux circulation mechanism work synchronously. Specifically, the steam heating pipe 1 in the heating mechanism heats the ammonium nitrate solution in the tank body 11 through the externally introduced high-temperature steam. At the same time, in combination with settings such as temperature and liquid level, it is ensured that the ammonium nitrate solution is within a suitable temperature range and the heating mechanism is prevented from overheating; while the reflux circulation pipe 2 in the reflux circulation mechanism recirculates part of the ammonium nitrate solution discharged from the discharge port 3 back into the reflux circulation pipe 2 through the reflux pipeline (equipped with a reflux pump, etc.) and discharges it into the tank body 11. Since the outlets of the two reflux circulation pipes 2 are bent at 45°, and not on the same straight line, in this way, when refluxing, a vortex state will be generated in the tank body 11, which can play a good role in stirring the ammonium nitrate solution in the tank body 11, making the concentration and temperature of the internal solution uniform. During the working process, of course, the liquid level interlock control is also accompanied.

[0048] The above description of the embodiments is for the convenience of those of ordinary skill in the art to understand and use the invention. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative labor. Therefore, the present invention is not limited to the above embodiments, and the improvements and modifications made by those skilled in the art without departing from the scope of the present invention according to the disclosure of the present invention should be within the protection scope of the present invention.

Claims

1. A large horizontal ammonium nitrate solution storage tank, characterized in that, It includes a tank body, as well as a feed inlet, a discharge outlet, a heating mechanism, and a rain shower mechanism provided on the tank body. A reflux circulation mechanism is also provided inside the tank body. The reflux circulation mechanism is composed of several groups of reflux circulation components arranged along the height direction of the tank body. Each group of reflux circulation components consists of two reflux circulation pipes installed diagonally in the axial direction of the tank body. One end of each reflux circulation pipe extends out of the tank body and is connected to an external reflux pipeline. The reflux pipeline is also connected to the feed inlet and is used to circulate part of the material discharged from the discharge outlet back into the tank body through the reflux circulation pipes. The outlets of the two reflux circulation pipes in the same group of reflux circulation components are not on the same straight line; The outlet of the reflux circulation pipe is processed into a bent structure; The outlet of the reflux circulation pipe is bent at 45°; The two reflux circulation pipes in the same group of reflux circulation components are at the same height along the height direction of the tank body; There are two groups of the reflux circulation components; The heating mechanism is composed of several layers of steam heating pipes installed inside the tank body. Both ends of each layer of steam heating pipes are respectively connected to an external steam supply system; There are three layers of the steam heating pipes; The rain shower mechanism includes several rain shower nozzles placed inside the tank body, and a cooling water pipeline located outside the tank body and connected to the rain shower nozzles; A feed pipe inserted into the lower region of the tank body is connected to the feed inlet; A liquid level gauge port and a thermometer port are also provided at the top of the tank body. A liquid level gauge extending into the interior of the tank body is installed at the liquid level gauge port, and a thermometer for measuring the internal temperature of the tank body is installed at the thermometer port.

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