Environment-friendly fine powder sulfur melting and recycling system

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 utility model relates to sulfur forming technical field, specifically is a kind of fine powder sulfur melting recycling and tail gas processing device and process. BACKGROUND

[0002] With the development of large-scale of refining industry, the processing capacity is larger, the proportion of inferior and high sulfur crude oil is also increasing, and the sulfur processing capacity of sulfur recovery unit will continue to increase, and the processing capacity requirement of sulfur forming equipment will be more and more large. The sulfur generated by sulfur recovery unit is liquid, if liquid sulfur is transported to the user, it needs to maintain the heat temperature above 120 DEG C and equip corresponding safety measures, the cost is too high, at present, except for a few places in China, most of the sulfur recovery units choose to convert liquid sulfur into regular solid particles for safe, reliable, environmentally friendly transportation, storage and use. Sulfur particles have obvious advantages such as stable characteristics, excellent flow performance, no dust and no environmental pollution, and sulfur particles have become the first choice of related industries.

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

[0004] In the case of small sulfur output, fine powder sulfur can be handled by manual cleaning at regular intervals. In the case of large sulfur output, manual cleaning at regular intervals will greatly increase the labor intensity of on-site workers, and at the same time, cause environmental pollution and harm the physical and mental health of on-site workers.

[0005] Therefore, it is of great significance to design and prepare a fine powder sulfur melting recycling system and process for the large-scale recycling and environmental improvement of fine powder sulfur. SUMMARY

[0006] The utility model aims at solving the problem that the fine powder sulfur produced by the existing sulfur forming machine in the case of large processing capacity is difficult to handle, pollutes the environment and harms the physical and mental health of on-site workers, and provides an environmentally friendly fine powder sulfur melting recycling system to ensure the long-period stable operation of large processing capacity sulfur forming machine.

[0007] The utility model provides a kind of environmentally friendly fine powder sulfur melting recycling system, including molten sulfur subassembly, heating component and tail gas processing component, molten sulfur subassembly includes remelt tank, agitator and liquid sulfur pump, agitator is arranged in the inside of remelt tank, for the dispersion and melting of fine powder sulfur floating on liquid surface, liquid sulfur pump is used to form the liquid sulfur that is heated after being formed in remelt tank by heating component and is transported to sulfur forming machine or liquid sulfur pool to be recycled;

[0008] The tail gas treatment assembly comprises a sprayer, an ejector, a fan, a water tank and a centrifugal pump, the sprayer is arranged above the remelting tank, the lower part of the sprayer is connected with the top of the remelting tank through a conveying pipeline, the centrifugal pump arranged in the water tank provides spraying liquid for the sprayer, the ejector is arranged above the sprayer, and the air inlet of the ejector is connected with the outlet of the fan, so that the sprayer can perform extraction type spraying washing on the tail gas generated in the remelting tank under the condition of negative pressure generated by the ejector.

[0009] Further, the ejector comprises 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 with the outlet of the fan, and the tail gas inlet is connected with the top end of the sprayer.

[0010] Further, the ejector comprises an ejector body and a telescopic pipe arranged below the ejector body, the bottom end of the telescopic pipe is the tail gas inlet, an adjustable gap is arranged between the top end of the telescopic pipe and the throat of the ejector body, and an adjusting handle is further arranged on the telescopic pipe, the adjusting handle adjusts the length of the telescopic pipe, so as to adjust the size of the gap between the top end of the telescopic pipe and the throat of the ejector body, thereby adjusting the negative pressure generated by the ejector.

[0011] Further, the heating assembly comprises a steam heating coil arranged in the remelting tank, the steam heating coil is composed of an internal coil arranged in a spiral shape and a bottom coil arranged in a serpentine shape, and the internal coil and the bottom coil are connected with the remelting tank through flanges.

[0012] Further, the heating assembly further comprises a desuperheater arranged on the steam conveying pipeline, the desuperheater performs desuperheating and / or pressure reducing treatment on the heating steam, and then the steam is sent into the steam heating coil in the remelting tank through the steam conveying pipeline.

[0013] Further, the remelted utilization system further comprises a control mechanism, the remelting tank is provided with a temperature sensor and a liquid level sensor which are in communication connection with the control mechanism, the control mechanism controls the actions of the heating assembly and the liquid sulfur pump through the information feedback of the temperature sensor and the liquid level sensor, so as to adjust the temperature and the liquid level of the liquid sulfur in the remelting tank.

[0014] Further, a steam tracing jacket for avoiding condensation of misty liquid sulfur is arranged on the conveying pipeline between the lower part of the sprayer and the top of the remelting tank.

[0015] Further, the stirrer is connected with 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 at a liquid level position in the remelting tank, the horizontal pump is installed at a liquid sulfur outlet position outside the remelting tank, and a heat tracing unit is arranged on the horizontal pump.

[0016] Further, the sprayer is provided with at least two spraying layers arranged in parallel from top to bottom.

[0017] The utility model discloses beneficial effect:

[0018] 1, the environmental protection type fine powder sulfur fusion recycling system of the utility model, simple device, reasonable process, it is through the fine powder sulfur of sulfur forming machine generation and is sent into the remelting tank and is melted into liquid sulfur, and then is pumped back to the forming machine or liquid sulfur pool through the liquid sulfur, realizes the automation and environmental protection treatment of fine powder sulfur, solves the problem of fine powder sulfur treatment of large processing capacity sulfur forming machine, realizes the effective recycling of fine powder sulfur, improves economic benefit.

[0019] 2, the environmental protection type fine powder sulfur fusion recycling process of the utility model, by means of micro negative pressure operation and spray washing technology, the tail gas containing water vapor, mist liquid sulfur generated in the melting process of fine powder sulfur is collected and treated, the peculiar smell gas generated in the production operation process can be effectively collected and centralized treatment, and the pollution to the on-site operation environment in production operation is avoided.

[0020] 3, the environmental protection type fine powder sulfur fusion recycling process of the utility model, the tail gas is collected by using the technology of extraction and drainage, the condensation wall hanging and fan vibration problem of mist liquid drops on the fan impeller are avoided, the tail gas treatment effect of remelting tank is effectively guaranteed, the long-period stable operation of fusion recycling system is realized, and the high efficiency, standardization and environmental protection of fine powder sulfur recovery process are realized.

[0021] 4, the environmental protection type fine powder sulfur fusion recycling system of the utility model, the heating scheme of heating coil pipe is used to heat and melt fine powder sulfur, the heating coil pipe is built-in in the remelting tank, and is independently installed, the heating coil pipe is immersed in liquid sulfur, steam and fine powder sulfur are directly heat exchanged through liquid sulfur, and the heat exchange efficiency is effectively improved;The independent installation of heating coil pipe is convenient for daily maintenance, repair and replacement. DRAWINGS

[0022] Figure 1 It is the process flow diagram of the utility model;

[0023] Figure 2 It is the structure schematic view of internal coil pipe;

[0024] Figure 3 It is the structure schematic view of bottom coil pipe;

[0025] Figure 4 It is the structure schematic view of the extractor.

[0026] Reference: 1, remelt tank; 2, stirrer; 3, liquid sulfur pump; 4, heating coil; 5, temperature and pressure reducer; 6, sprayer; 7, ejector; 701, adjusting handle; 702, telescopic tube; 703, throat; 8, fan; 9, sink; 10; centrifugal pump; 11, liquid sulfur filter. DETAILED DESCRIPTION

[0027] The utility model will be described in more detail below in combination with the drawings and specific embodiments. It should be pointed out that this content gives the best embodiment of the utility model. However, the utility model can still be realized in many different ways and is not limited to the embodiments described in this content. On the contrary, these embodiments are provided in order for the utility model to be more thorough, comprehensive and complete.

[0028] As shown in the figure, the utility model discloses an environment-friendly fine powder sulfur melting and recycling system, which comprises a molten sulfur assembly, a heating assembly, a tail gas treatment assembly, a matched pipeline assembly and a control mechanism.

[0029] The molten sulfur assembly comprises a remelt tank 1, a stirrer 2, a liquid sulfur pump 3 and a liquid sulfur filter 11. The remelt tank 1 is flat-bottomed and cylindrical, and is made of stainless steel. The stirrer 2 is installed in the remelt tank 1 and connected through flanges. Fine powder sulfur enters the remelt tank 1, and the stirrer 2 disperses the fine powder sulfur floating on the liquid surface, fully mixes and melts the fine powder sulfur with the liquid sulfur, increases the turbulence of the liquid sulfur in the tank, and improves the heat exchange efficiency of the remelt tank 1. The liquid sulfur pump 3 can be a horizontal pump or a vertical pump. The vertical pump is installed in the remelt tank 1, and the horizontal pump is installed outside the remelt tank 1 and connected through a pipe opening. If the liquid sulfur pump 3 is a vertical pump, a submerged centrifugal pump is used. If the liquid sulfur pump 3 is a horizontal pump, a screw pump is used, and the screw pump needs to be heated and insulated to prevent the liquid sulfur from condensing. The liquid sulfur pump 3 is used to periodically deliver the melted liquid sulfur to a sulfur forming machine or a liquid sulfur pool. A liquid sulfur filter 11 for filtering impurities in the liquid sulfur is arranged on the delivery pipeline.

[0030] Meanwhile, a remote liquid level meter (liquid level sensor) is arranged in the remelt tank 1 to detect the liquid level in the remelt tank 1. The remote liquid level meter is connected to the control mechanism and interlocked with the liquid sulfur pump 3. According to the setting, the control mechanism automatically adjusts the liquid level in the remelt tank through the liquid sulfur pump 3 according to the feedback of the remote liquid level meter. A temperature transmitter (temperature sensor) is arranged in the remelt tank 1 to detect the temperature in the remelt tank 1. The temperature transmitter is connected to the control mechanism 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 transmitter to adjust the temperature of the liquid sulfur in the remelt tank 1.

[0031] Further, the temperature of liquid sulfur in the remelting tank 1 must be reasonably set, and the principle is to reduce the temperature of liquid sulfur as much as possible under the premise of ensuring the melting effect of fine powder sulfur from upstream, to reduce the volatilization of liquid sulfur and reduce energy consumption. At the same time, due to the physical properties of liquid sulfur itself, the viscosity of liquid sulfur rises sharply after exceeding 160℃, which is not conducive to the melting of fine powder sulfur, therefore, the temperature of liquid sulfur in the remelting tank 1 needs to be controlled within the range of 140±5℃.

[0032] The heating assembly includes a heating coil 4 and a desuperheater 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-shaped, and the bottom coil is serpentine-shaped. The internal coil and the bottom coil are both connected with the remelting tank 1 by flanges, which is convenient for disassembly and maintenance. In order to reduce corrosion, the heating coil 4 is made of stainless steel. The desuperheater 5 is connected with the remelting tank 1 through pipelines. The desuperheater 5 realizes the desuperheating and pressure reduction of high-pressure steam to the saturated steam with a pressure of 0.5~0.6MPa required by the remelting tank 1.

[0033] 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 with the remelting tank 1 through pipelines, and a plurality of spraying layers are arranged in the sprayer 6 in parallel from top to bottom. The ejector 7 is located at the top of the sprayer 6 and includes 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 with the outlet of the fan, the tail gas inlet is connected with the top end of the sprayer, high-speed air enters from the side, tail gas enters from the bottom and is discharged from the top, the pressure drop is small, and the tail gas suction effect is good. The ejector 7 adopts negative pressure suction principle, the outlet of the fan 8 is connected with the inlet of the ejector 7 through a conveying pipeline, air is sent into the ejector 7 by the fan 8 to generate high-speed airflow, the airflow speed is not less than 25m / s, a negative pressure area is generated in the ejector 7, and the tail gas of the remelting tank 1 is introduced into the sprayer 6 by utilizing the pressure difference. The spraying water comes from the water tank 9, the water tank 9 is provided with the centrifugal pump 10, the spraying water is sent into the sprayer 6 by the centrifugal pump 10, and the spraying water can be clean water or alkali liquor. In structure, the ejector includes an ejector main body and a telescopic pipe 702 which is nested below the ejector main body. The bottom end of the telescopic pipe 702 is the tail gas inlet, and an adjustable gap L is arranged between the top end of the telescopic pipe 702 and the throat 703 of the ejector main body. An adjusting handle 701 is further arranged on the telescopic pipe 702. The adjusting handle 701 adjusts the length of the telescopic pipe 702, adjusts the size of the gap L between the top end of the telescopic pipe 702 and the throat 703 of the ejector main body, and further adjusts the negative pressure generated by the ejector 7. At the same time, the air flow speed of the tail gas inlet of the sprayer 6 can be adjusted, and the tail gas of the remelting tank 1 with different air volumes can meet the production requirements.

[0034] As Figure 1As shown, the complete pipe assembly includes liquid sulfur, water, tail gas, steam and condensed water pipes. The above pipes combine the molten sulfur assembly, the heating assembly and the tail gas treatment assembly into an integral whole.

[0035] Further, in order to avoid condensation of the misty liquid sulfur in the delivery pipe, the delivery pipe between the remelting tank 1 and the sprayer 6 is provided with a steam jacket for heating. The steam for heating the coil pipe 4 enters from the top of the coil pipe and is discharged from the bottom, so as to facilitate drainage of condensed water and avoid water hammer phenomenon, and ensure the heat exchange effect of the coil pipe 4.

[0036] An environment-friendly fine powder sulfur melting and recycling process, specifically comprising the following steps:

[0037] Step one, before the first operation of the system, a certain amount of liquid sulfur is injected into the remelting tank 1, so that the liquid level in the remelting tank 1 reaches 40-50%;

[0038] Step two, the fine powder sulfur generated by the sulfur forming machine is delivered to the remelting tank 1 through the pipeline, and the fine powder sulfur can be continuously or intermittently delivered. The material in the remelting tank 1 is heated to 125-150℃ by the heating assembly, and the temperature is maintained. The remelting tank 1 is provided with a heating coil pipe 4, and the heating medium can be steam or heat conducting oil. It is more preferable to use 0.5-0.6 MPa saturated steam. If there is no saturated steam with this pressure, a desuperheater 5 is used to reduce the temperature and pressure of the high-pressure steam to 0.5-0.6 MPa. A stirrer 2 is used to disperse the fine powder sulfur floating on the liquid surface in the remelting tank 1, so as to fully mix and melt the fine powder sulfur with the liquid sulfur;

[0039] Step three, the temperature detector 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 input of the heating coil pipe 4, and controls the temperature of the liquid sulfur in the remelting tank 1. The temperature detector is also provided with the highest and lowest temperature alarm values;

[0040] The remelting tank 1 is also provided with a liquid level sensor. When the liquid level of the liquid sulfur in the remelting tank 1 reaches 75-85% of the set value, the liquid level signal passes through the control mechanism to start the liquid sulfur pump 3, and the liquid sulfur in the remelting tank 1 is delivered to the sulfur forming machine or the liquid sulfur pool through the pipeline and the liquid sulfur filter 11 for recycling. When the liquid level of the liquid sulfur in the remelting tank 1 is lower than 50%, the liquid level signal passes through the control mechanism to close the liquid sulfur pump 3.

[0041] Step four, due to the characteristics of the front end sulfur forming process, the fine powder sulfur inevitably contains a large amount of moisture, resulting in a large amount of water vapor during the melting process of fine powder sulfur, and the liquid sulfur in the remelting tank 1 will have natural volatilization, therefore, the heating assembly is opened at the same time, the fan 8, the ejector 7 and the centrifugal pump 10 in the water tank 9 are opened, the fan 8 sends air into the ejector, generates a high-speed airflow of not less than 25m / s in the ejector 7, so that the central part of the ejector 7 generates a negative pressure area, the pressure difference introduces the tail gas containing water vapor and mist liquid sulfur in the remelting tank 1 into the sprayer 6 through the conveying pipeline for spraying and washing, the washed gas is discharged into the atmosphere, the spraying water of the remelting tank 1 tail gas comes from the water tank 9, the spraying water is pressurized and delivered to the sprayer 6 through the centrifugal pump 10, the sprayer 6 is provided with a plurality of spraying layers, the spraying water after washing 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 adjusting valve on the liquid supplement pipeline, the spraying water is supplemented regularly to ensure that the liquid level of the water tank 9 is constant.

[0042] It should be noted that for those skilled in the art, without departing from the idea of the present application, through logical analysis and reasoning or limited experiments within a certain range, the technical solutions and implementation modes listed in the present application can also be changed or improved, and the equivalent or equivalent technical solutions obtained are within the scope of protection of the present application.

Claims

1. An environmentally friendly fine powder sulfur melting recycling system, comprising a sulfur melting assembly, a heating assembly and a tail gas treatment assembly, characterized in that: The molten sulfur assembly comprises a remelting tank, a stirrer arranged inside the remelting tank for dispersing and melting fine powder sulfur floating on the liquid surface, and a liquid sulfur pump for conveying liquid sulfur formed in the remelting tank after being heated by the heating assembly to a sulfur forming machine or a liquid sulfur pool for reuse. The tail gas treatment assembly comprises a sprayer, an ejector, a fan, a water tank and a centrifugal pump, the sprayer is arranged above the remelting tank, the lower part of the sprayer is connected to the top of the remelting tank through a conveying pipeline, the centrifugal pump arranged in the water tank provides spraying 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 spray and wash the tail gas generated in the remelting tank under the negative pressure generated by the ejector.

2. The environmentally friendly fine powder sulfur melting and recycling system according to claim 1, characterized in that: The ejector comprises 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 end of the sprayer.

3. The environmentally friendly fine powder sulfur melting and recycling system according to claim 1 or 2, characterized in that: The ejector comprises an ejector body and a telescopic pipe arranged below the ejector body, the bottom end of the telescopic pipe is the tail gas inlet, an adjustable gap is arranged between the top end of the telescopic pipe and the throat of the ejector body, and an adjusting handle is arranged on the telescopic pipe, the adjusting handle adjusts the length of the telescopic pipe, adjusts the size of the gap between the top end of the telescopic pipe and the throat of the ejector body, and then adjusts the negative pressure generated by the ejector.

4. The environmentally friendly fine powder sulfur melting and recycling system according to claim 1, characterized in that: The heating assembly comprises a steam heating coil arranged in the remelting tank, the steam heating coil is composed of an internal coil arranged in a spiral shape and a bottom coil arranged in a serpentine shape, and the internal coil and the bottom coil are connected to the remelting tank through flanges.

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

6. The environmentally friendly fine powder sulfur melting and recycling system according to claim 1, characterized in that: The molten reuse system further comprises a control mechanism, a temperature sensor and a liquid level sensor arranged in the remelting tank and in communication connection with the control mechanism, the control mechanism controls the actions of the heating assembly and the liquid sulfur pump through the information feedback of the temperature sensor and the liquid level sensor, so as to adjust the temperature and the liquid level of the liquid sulfur in the remelting tank.

7. The environmentally friendly fine powder sulfur melting and recycling system according to claim 1, characterized in that: A steam tracing jacket is arranged on the conveying pipeline between the lower part of the sprayer and the top of the remelting tank to prevent misty liquid sulfur from condensing in the conveying pipeline.

8. The environmentally friendly fine powder sulfur melting and recycling system according to claim 1, characterized in that: The stirrer is connected to the inside of the remelting tank through a flange; the liquid sulfur pump is a horizontal pump or a vertical pump, the vertical pump is installed at a submergence position inside the remelting tank, the horizontal pump is installed at a liquid sulfur outlet outside the remelting tank, and a heat tracing unit is arranged on the horizontal pump.

9. The environmentally friendly fine powder sulfur melting and recycling system according to claim 1, characterized in that: At least two spraying layers are arranged in parallel in the sprayer.

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