Environment-friendly fine powder sulfur melting and recycling system and process

Abstract

An environment-friendly fine powder sulfur melting and recycling system comprises a sulfur melting assembly, a heating assembly and a tail gas treatment assembly, the sulfur melting assembly comprises a remelting tank, a stirrer and a liquid sulfur pump, and the stirrer is arranged in the remelting tank and used for scattering and melting fine powder sulfur floating on the liquid surface; the liquid sulfur pump is used for conveying liquid sulfur formed after being heated by the heating assembly in the remelting tank into the sulfur forming machine or the liquid sulfur pool for recycling; according to the process disclosed by the invention, the tail gas containing water vapor and vaporific liquid sulfur generated in the melting process of the fine powder sulfur is collected and treated by virtue of an injection drainage negative pressure operation and a spray washing technology, so that long-period stable operation of a melting and recycling system is realized, and high efficiency, standardization and environmental protection of the recovery process of the fine powder sulfur are realized.

Description

Technical Field

[0001] The invention relates to the technical field of sulfur molding, in particular to an environmentally friendly fine sulfur powder melting and recycling system and process. Background Art

[0002] With the development of the scale of the refining industry, the processing capacity has increased, the proportion of inferior and high-sulfur crude oil has continued to increase, the processing capacity of sulfur units will continue to increase, and the processing capacity requirements for sulfur forming equipment will also become greater and greater. The sulfur generated by the reaction of the sulfur recovery unit is liquid. If the liquid sulfur is transported to the user unit, it needs to maintain a heating temperature above 120°C and be equipped with corresponding safety measures. The cost is too high. At present, except for a very small number of places in China that use liquid transportation, most sulfur recovery units choose to use liquid sulfur converted into regular solid particles for safe, reliable and environmentally friendly transportation, storage and use. Sulfur granules have become the first choice for related industries due to their obvious advantages such as stable characteristics, superior flow performance, no dust and no environmental pollution.

[0003] At present, the liquid sulfur forming equipment commonly used at home and abroad mainly includes steel belt granulator, drum granulator and sulfur wet forming machine. The above three forming machines will inevitably produce a lot of fine sulfur powder during the particle forming or transportation process.

[0004] When the sulfur output is small, fine sulfur powder can be handled by manual regular cleaning. When the sulfur output is large, manual regular cleaning will greatly increase the labor intensity of on-site workers, cause environmental pollution, and endanger the physical and mental health of on-site workers.

[0005] Therefore, designing and preparing a fine sulfur powder melting and recycling system and process is of great significance for the large-scale recycling of fine sulfur powder and environmental improvement. Summary of the invention

[0006] The present invention aims to solve the problem that the fine powder sulfur produced by the existing sulfur molding machine under large processing capacity is difficult to handle, pollutes the environment, and endangers the physical and mental health of on-site workers. It provides an environmentally friendly fine powder sulfur melting and recycling system and process to ensure the long-term stable operation of the large-processing sulfur molding machine.

[0007] The technical solution adopted by the present invention to solve the above technical problems is: an environmentally friendly fine sulfur powder melting and recycling system, comprising a sulfur melting component, a heating component and an exhaust gas treatment component, the sulfur melting component comprises a remelting tank, an agitator and a liquid sulfur pump, the agitator is arranged inside the remelting tank, and is used to break up and melt the fine sulfur powder floating on the liquid surface, and the liquid sulfur pump is used to transport the liquid sulfur formed in the remelting tank after being heated by the heating component to a sulfur molding machine or a liquid sulfur pool for recycling; The exhaust gas treatment assembly includes a sprayer, an ejector, a fan, a water tank and a centrifugal pump. The sprayer is arranged above the remelting tank, and the lower part of the sprayer is connected to the top of the remelting tank through a conveying pipe. The centrifugal pump arranged in the water tank provides spray liquid for the sprayer. The ejector is arranged above the sprayer, and the air inlet of the ejector is connected to the outlet of the fan, so that the sprayer can perform extraction spray washing on the exhaust gas generated in the remelting tank under the negative pressure condition generated by the ejector.

[0008] Furthermore, the ejector includes an exhaust gas inlet arranged at its bottom, an exhaust gas outlet arranged at its top and an air inlet arranged at one side thereof, the air inlet is connected to the outlet of the fan, and the exhaust gas inlet is connected to the top of the sprayer.

[0009] Furthermore, the ejector includes an ejector body and a telescopic tube nested under the ejector body, the bottom end of the telescopic tube is an exhaust gas inlet, an adjustable gap is provided between the top end and the throat of the ejector body, and an adjusting handle is also provided on the telescopic tube. The adjusting handle can adjust the length of the telescopic tube to adjust the size of the gap between the top end of the telescopic tube and the throat of the ejector body, thereby realizing the adjustment of the negative pressure generated by the ejector.

[0010] Furthermore, the heating assembly includes a steam heating coil arranged in the remelting tank, the steam heating coil is composed of a spirally arranged inner coil and a serpentine arranged bottom coil, and both the inner coil and the bottom coil are connected to the remelting tank through a flange.

[0011] Furthermore, the heating assembly also includes a temperature reducer and pressure reducer arranged on the steam conveying pipeline, which cools down and / or reduces the pressure of the heating steam before sending it into the steam heating coil in the remelting tank through the steam conveying pipeline.

[0012] Furthermore, the melting and recycling system also includes a control mechanism, and a temperature sensor and a liquid level sensor which are communicatively connected to the control mechanism are arranged in the remelting tank. The control mechanism controls the operation of the heating component and the liquid sulfur pump through information feedback from the temperature sensor and the liquid level sensor, so as to adjust the temperature and liquid level of the liquid sulfur in the remelting tank.

[0013] Furthermore, a steam heating jacket is provided on the conveying pipeline between the lower part of the sprayer and the top of the remelting tank to prevent the mist liquid sulfur from condensing therein.

[0014] Furthermore, the agitator is connected to the inside of the remelting tank through a flange; the liquid sulfur pump is a horizontal pump or a vertical pump, wherein the vertical pump is installed in a submerged position inside the remelting tank, and the horizontal pump is installed at the liquid sulfur outlet outside the remelting tank, and a heating and insulation unit is provided on the horizontal pump.

[0015] Furthermore, at least two spray layers are arranged in parallel up and down in the sprayer.

[0016] An environmentally friendly fine sulfur powder melting and recycling process comprises the following steps: Step 1: Before the first operation, inject a certain amount of liquid sulfur into the remelting tank to make the liquid level in the remelting tank reach 40-50%; Step 2: transport the fine sulfur powder to the remelting tank through a pipeline, use a heating component to heat the material in the remelting tank to 125-150°C and maintain the temperature, use an agitator to break up the fine sulfur powder floating on the liquid surface in the remelting tank, and fully mix and melt it with the liquid sulfur; Step 3: When the liquid sulfur level in the remelting tank reaches 75-85%, start the liquid sulfur pump to transport the liquid sulfur in the remelting tank to the sulfur molding machine or liquid sulfur pool through the pipeline for reuse; when the liquid sulfur level in the remelting tank is lower than 50%, turn off the liquid sulfur pump; Step 4: While the heating component is turned on, turn on the fan, the ejector and the centrifugal pump in the water tank. The fan sends air into the ejector, generating a high-speed airflow of not less than 25 m / s in the ejector, so that a negative pressure area is generated inside the ejector. The pressure difference introduces the tail gas containing water vapor and misty liquid sulfur in the remelting tank into the sprayer through the conveying pipeline for spray washing. The washed gas is discharged into the atmosphere, and the spray water after washing flows back to the water tank through the pipeline for reuse. The water tank is cleaned regularly.

[0017] Beneficial effects of the present invention: 1. The environmentally friendly fine sulfur powder melting and recycling system of the present invention has a simple device and a reasonable process. The fine sulfur powder produced by the sulfur molding machine is sent into a remelting tank to be melted into liquid sulfur, and then sent back to the molding machine or the liquid sulfur pool through a liquid sulfur pump, thereby realizing the automation and environmental protection of the fine sulfur powder treatment, solving the problem of the difficulty in treating the fine sulfur powder of a large-capacity sulfur molding machine, realizing the effective recycling of the fine sulfur powder, and improving the economic benefits.

[0018] 2. The environmentally friendly fine sulfur powder melting and recycling process of the present invention collects and treats the tail gas containing water vapor and mist liquid sulfur generated in the fine sulfur powder melting process by means of micro-negative pressure operation and spray washing technology, and can effectively collect and centrally treat the odorous gas generated in the production operation process, thereby avoiding the pollution of the on-site operating environment during production operation.

[0019] 3. The environmentally friendly fine sulfur powder melting and recycling process of the present invention adopts the technology of extraction and drainage to collect the tail gas, avoiding the condensation of mist droplets on the fan impeller and the problem of fan vibration, effectively ensuring the tail gas treatment effect of the remelting tank, realizing the long-term stable operation of the melting and recycling system, and realizing the efficiency, standardization and environmental protection of the fine sulfur powder recovery process.

[0020] 4. The environmentally friendly fine sulfur powder melting and recycling system of the present invention adopts a heating scheme of a heating coil to heat and melt the fine sulfur powder. The heating coil is built into the remelting tank and installed independently. The heating coil is immersed in liquid sulfur. Steam and fine sulfur powder directly exchange heat through liquid sulfur, which effectively improves the heat exchange efficiency. The independent installation of the heating coil facilitates daily maintenance, repair and replacement. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a process flow chart of the present invention; Figure 2 It is a schematic diagram of the structure of the internal coil; Figure 3 It is a schematic diagram of the structure of the bottom coil; Figure 4 It is a structural diagram of the ejector.

[0022] Figure numerals: 1. remelting tank; 2. agitator; 3. liquid sulfur pump; 4. heating coil; 5. temperature and pressure reducer; 6. sprayer; 7. ejector; 701. adjustment handle; 702. telescopic tube; 703. throat; 8. fan; 9. water tank; 10; centrifugal pump; 11. liquid sulfur filter. DETAILED DESCRIPTION

[0023] The present invention will be described in more detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that this content provides the best embodiment of the present invention. However, the present invention can still be implemented in many different ways and is not limited to the embodiments described in this content. On the contrary, these embodiments are provided to make the present invention more thorough, comprehensive and complete.

[0024] As shown in the figure, an environmentally friendly fine sulfur powder melting and recycling system of the present invention includes a sulfur melting component, a heating component, an exhaust gas treatment component, a matching pipeline component and a control mechanism.

[0025] The sulfur melting assembly includes a remelting tank 1, an agitator 2, a liquid sulfur pump 3 and a liquid sulfur filter 11. The remelting tank 1 is a flat-bottomed cylindrical material, and the agitator 2 is installed in the remelting tank 1 and connected by a flange. The fine sulfur powder enters the remelting tank 1. The agitator 2 breaks up the fine sulfur powder floating on the liquid surface, fully mixes and melts it with the liquid sulfur, and at the same time, increases the turbulence of the liquid sulfur in the tank, and improves the heat exchange efficiency of the remelting tank 1. The liquid sulfur pump 3 can be a horizontal pump or a vertical pump. The vertical pump is installed in the remelting tank 1, and the horizontal pump is installed on the outside of the remelting tank 1, and is connected through a pipe mouth. If the liquid sulfur pump 3 is a vertical pump, a submerged centrifugal pump is used; if it is a horizontal pump, a screw pump is used, and the screw pump needs to be heated and insulated to avoid condensation of liquid sulfur. The liquid sulfur pump 3 is used to regularly transport the melted liquid sulfur to the sulfur molding machine or the liquid sulfur pool, and a liquid sulfur filter 11 for filtering impurities in the liquid sulfur is arranged on the conveying pipeline.

[0026] At the same time, the remelting tank 1 is also provided with a remote level gauge (liquid level sensor) for detecting the liquid level in the remelting tank 1. The remote level gauge is connected to the control structure and interlocked with the liquid sulfur pump 3. According to the setting, the control mechanism automatically adjusts the liquid level in the remelting tank through the liquid sulfur pump 3 according to the feedback of the remote level gauge. The remelting tank 1 is provided with a temperature changer (temperature sensor) for detecting the temperature in the remelting tank 1. The temperature transmitter is connected to the control structure and interlocked with the regulating valve on the steam pipeline. The control mechanism automatically adjusts the temperature of the heating coil 4 through the opening size of the regulating valve according to the temperature feedback of the temperature changer to adjust the temperature of the liquid sulfur in the remelting tank 1.

[0027] Furthermore, the temperature of the liquid sulfur in the remelting tank 1 must be set reasonably. The principle is to reduce the temperature of the liquid sulfur as much as possible, reduce the volatilization of the liquid sulfur and reduce energy consumption, while ensuring the melting effect of the fine sulfur powder from the upstream. At the same time, due to the physical properties of the liquid sulfur itself, the viscosity of the liquid sulfur rises sharply after exceeding 160°C, which is not conducive to the melting of the fine sulfur powder. Therefore, the temperature of the liquid sulfur in the remelting tank 1 needs to be controlled within the range of 140±5°C.

[0028] The heating assembly includes a heating coil 4 and a temperature reducer 5. The steam heating coil 4 is arranged inside the remelting tank 1 and is divided into an internal coil and a bottom coil. The internal coil is spiral and the bottom coil is serpentine. Both the internal coil and the bottom coil are connected to the remelting tank 1 with flanges for easy disassembly and maintenance. In order to reduce corrosion, the heating coil 4 is made of stainless steel. The temperature reducer 5 is connected to the remelting tank 1 through a pipeline. The temperature reducer 5 reduces the temperature and pressure of high-pressure steam to saturated steam with a pressure of 0.5~0.6MPa required by the remelting tank 1.

[0029] The tail gas treatment assembly includes a sprayer 6, an ejector 7, a fan 8, a water tank 9, and a centrifugal pump 10. The sprayer 6 is located above the remelting tank 1 and is connected to the remelting tank 1 through a pipeline. The sprayer 6 is provided with multiple spray layers in parallel up and down. The ejector 7 is located at the top of the sprayer 6, including a tail gas inlet arranged at the bottom, a tail gas outlet arranged at the top, and an air inlet arranged at one side. The air inlet is connected to the outlet of the fan, and the tail gas inlet is connected to the top of the sprayer. High-speed air is side-inlet, and the tail gas enters from the bottom and is discharged from the top. The pressure drop is small and the tail gas absorption effect is good. The ejector 7 adopts the negative pressure ejection principle. The outlet of the fan 8 is connected to the inlet of the ejector 7 through a conveying pipeline. The air is sent into the ejector 7 through the fan 8 to generate a high-speed airflow with an airflow speed of not less than 25m / s. A negative pressure area is generated inside the ejector 7. The tail gas of the remelting tank 1 is introduced into the sprayer 6 by utilizing the pressure difference. The spray water comes from the water tank 9. The water tank 9 is provided with a centrifugal pump 10. The spray water is sent into the sprayer 6 through the centrifugal pump 10. The spray water can be clean water or alkaline solution. Structurally, the ejector includes an ejector body and a telescopic tube 702 nested below the ejector body. The bottom end of the telescopic tube 702 is the exhaust gas inlet, and an adjustable gap L is provided between the top and the throat 703 of the ejector body. The telescopic tube 702 is also provided with an adjustment handle 701. The adjustment handle 701 adjusts the length of the telescopic tube 702 to adjust the size of the gap L between the top of the telescopic tube 702 and the throat 703 of the ejector body, thereby adjusting the negative pressure generated by the ejector 7. At the same time, the air flow rate of the exhaust gas inlet of the sprayer 6 can also be adjusted, and the production requirements of the exhaust gas of the remelting tank 1 with different air volumes can be met.

[0030] like Figure 1 As shown, the supporting pipeline components include liquid sulfur, water, tail gas, steam and condensate pipelines. The sulfur melting component, heating component and tail gas treatment component are combined into a whole through the above pipelines.

[0031] Furthermore, in order to prevent the misted liquid sulfur in the remelting tank 1 from condensing in the conveying pipeline, the conveying pipeline between the remelting tank 1 and the sprayer 6 is heated by a steam jacket. The steam of the heating coil 4 enters from the top of the coil and is discharged from the bottom, which is convenient for draining condensed water, avoiding water hammer phenomenon, and ensuring the heat exchange effect of the heating coil 4.

[0032] An environmentally friendly fine sulfur powder melting and recycling process specifically comprises the following steps: Step 1: Before the system is operated for the first time, a certain amount of liquid sulfur is injected into the remelting tank 1 to make the liquid level in the remelting tank 1 reach 40-50%; Step 2: The fine powder sulfur produced by the sulfur molding machine is transported to the remelting tank 1 through a pipeline. The fine powder sulfur can be transported continuously or intermittently. A heating component is used to heat the material in the remelting tank 1 to 125-150°C and maintain the temperature. A heating coil 4 is provided in the remelting tank 1. The heating medium can be heated by steam or thermal oil. It is better to use saturated steam of 0.5-0.6MPa for heating. If there is no saturated steam of this pressure, a temperature reducer 5 is used to reduce the temperature and pressure of the high-pressure steam to 0.5-0.6MPa. A stirrer 2 is used to break up the fine powder sulfur floating on the liquid surface in the remelting tank 1 so that it is fully mixed and melted with the liquid sulfur. Step 3: The temperature detection instrument installed at the bottom of the remelting tank 1 transmits the temperature in the remelting tank 1 to the control mechanism, automatically adjusts the opening of the regulating valve installed on the steam pipeline, adjusts the steam intake of the heating coil 4, and controls the liquid sulfur temperature in the remelting tank 1. The temperature detection instrument is also provided with maximum and minimum temperature alarm values; A liquid level sensor is also provided in the remelting tank 1. When the liquid sulfur level in the remelting tank 1 reaches 75-85% of the set value, the liquid level signal is transmitted through the control mechanism to start the liquid sulfur pump 3, and the liquid sulfur in the remelting tank 1 is filtered through the pipeline and then transported to the sulfur forming machine or the liquid sulfur pool for reuse after being filtered by the liquid sulfur filter 11. When the liquid sulfur level in the remelting tank 1 is lower than 50%, the liquid level signal is transmitted through the control mechanism to turn off the liquid sulfur pump 3. Step 4: Due to the characteristics of the front-end sulfur forming process, the fine powder sulfur inevitably contains a large amount of moisture, which results in a large amount of water vapor being generated during the melting process of the fine powder sulfur. At the same time, the liquid sulfur in the melting tank 1 will naturally evaporate. Therefore, it is necessary to turn on the fan 8, the ejector 7 and the centrifugal pump 10 in the water tank 9 while turning on the heating component. The fan 8 sends air into the ejector, generating a high-speed airflow of not less than 25m / s in the ejector 7, so that a negative pressure area is generated in the center of the ejector 7. The pressure difference will The tail gas containing water vapor and mist liquid sulfur in the remelting tank 1 is introduced into the sprayer 6 through the conveying pipeline for spray washing, and the gas after washing is discharged into the atmosphere. The spray water of the tail gas of the remelting tank 1 comes from the water tank 9. The spray water is pressurized and conveyed to the sprayer 6 by the centrifugal pump 10. The sprayer 6 is provided with multiple spray layers. After washing, the spray water flows back to the water tank 9. The water tank 9 is cleaned regularly. The water tank 9 is provided with a liquid level meter. The liquid level meter is interlocked with the regulating valve on the replenishing liquid pipeline. The spray water is replenished regularly to ensure that the liquid level of the water tank 9 is constant.

[0033] It should be pointed out that for ordinary technicians in this technical field, without departing from the spirit of the present invention, through logical analysis and reasoning or limited experiments within a certain range, several changes or improvements can be made to the technical solutions and implementation methods listed in the present invention, and the obtained equivalent or equivalent technical solutions are all within the scope of protection of the present invention.

Claims

1. An environmentally friendly fine sulfur powder melting and recycling system, comprising a sulfur melting component, a heating component and an exhaust gas treatment component, characterized in that: The sulfur melting component includes a remelting tank, an agitator and a liquid sulfur pump. The agitator is arranged inside the remelting tank to break up and melt the fine sulfur powder floating on the liquid surface. The liquid sulfur pump is used to transport the liquid sulfur formed in the remelting tank after being heated by the heating component to the sulfur molding machine or the liquid sulfur pool for reuse. The exhaust gas treatment assembly includes a sprayer, an ejector, a fan, a water tank and a centrifugal pump. The sprayer is arranged above the remelting tank, and the lower part of the sprayer is connected to the top of the remelting tank through a conveying pipe. The centrifugal pump arranged in the water tank provides spray liquid for the sprayer. The ejector is arranged above the sprayer, and the air inlet of the ejector is connected to the outlet of the fan, so that the sprayer can perform extraction spray washing on the exhaust gas generated in the remelting tank under the negative pressure condition generated by the ejector.

2. The environmentally friendly fine sulfur powder melting and recycling system according to claim 1 is characterized in that: The ejector comprises an exhaust gas inlet arranged at the bottom, an exhaust gas outlet arranged at the top and an air inlet arranged at one side thereof, the air inlet is connected to the outlet of the fan, and the exhaust gas inlet is connected to the top of the sprayer.

3. An environmentally friendly fine sulfur powder melting and recycling system according to claim 1 or 2, characterized in that: The ejector includes an ejector body and a telescopic tube nested below the ejector body. The bottom end of the telescopic tube is an exhaust gas inlet, and an adjustable gap is provided between the top end and the throat of the ejector body. An adjusting handle is also provided on the telescopic tube. The adjusting handle adjusts the length of the telescopic tube to adjust the size of the gap between the top end of the telescopic tube and the throat of the ejector body, thereby realizing the adjustment of the negative pressure generated by the ejector.

4. The environmentally friendly fine sulfur powder melting and recycling system according to claim 1 is characterized in that: The heating assembly comprises a steam heating coil arranged in the remelting tank, the steam heating coil is composed of a spirally arranged inner coil and a serpentine arranged bottom coil, and both the inner coil and the bottom coil are connected to the remelting tank via a flange.

5. The environmentally friendly fine sulfur powder melting and recycling system according to claim 4 is characterized in that: The heating assembly also includes a temperature reducer and pressure reducer arranged on the steam conveying pipeline, which cools and / or reduces the pressure of the heating steam before sending it to the steam heating coil in the remelting tank through the steam conveying pipeline.

6. The environmentally friendly fine sulfur powder melting and recycling system according to claim 1 is characterized in that: The melting and recycling system also includes a control mechanism, and a temperature sensor and a liquid level sensor which are communicatively connected to the control mechanism are arranged in the remelting tank. The control mechanism controls the operation of the heating component and the liquid sulfur pump through information feedback from the temperature sensor and the liquid level sensor, so as to adjust the temperature and liquid level of the liquid sulfur in the remelting tank.

7. The environmentally friendly fine sulfur powder melting and recycling system according to claim 1 is characterized by: A steam heating jacket is provided on the conveying pipeline between the lower part of the sprayer and the top of the remelting tank to prevent the mist liquid sulfur from condensing inside the jacket.

8. The environmentally friendly fine sulfur powder melting and recycling system according to claim 1 is characterized by: The agitator is connected to the inside of the remelting tank through a flange; the liquid sulfur pump is a horizontal pump or a vertical pump, wherein the vertical pump is installed in the liquid position inside the remelting tank, and the horizontal pump is installed at the liquid sulfur outlet outside the remelting tank, and a heating and insulation unit is provided on the horizontal pump.

9. The environmentally friendly fine sulfur powder melting and recycling system according to claim 1 is characterized by: At least two spray layers are arranged in parallel up and down in the sprayer.

10. An environmentally friendly fine sulfur powder melting and recycling process, characterized in that: The following steps are involved: Step 1: Before the first operation, inject a certain amount of liquid sulfur into the remelting tank to make the liquid level in the remelting tank reach 40-50%; Step 2: transport the fine sulfur powder to the remelting tank through a pipeline, use a heating component to heat the material in the remelting tank to 125-150°C and maintain the temperature, use an agitator to break up the fine sulfur powder floating on the liquid surface in the remelting tank, and fully mix and melt it with the liquid sulfur; Step 3: When the liquid sulfur level in the remelting tank reaches 75-85%, start the liquid sulfur pump to transport the liquid sulfur in the remelting tank to the sulfur molding machine or liquid sulfur pool through the pipeline for reuse; when the liquid sulfur level in the remelting tank is lower than 50%, turn off the liquid sulfur pump; Step 4: While the heating component is turned on, turn on the fan, the ejector and the centrifugal pump in the water tank. The fan sends air into the ejector, generating a high-speed airflow of not less than 25 m / s in the ejector, so that a negative pressure area is generated inside the ejector. The pressure difference introduces the tail gas containing water vapor and misty liquid sulfur in the remelting tank into the sprayer through the conveying pipeline for spray washing. The washed gas is discharged into the atmosphere, and the spray water after washing flows back to the water tank through the pipeline for reuse. The water tank is cleaned regularly.

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