Device for recovering sulfur from steam containing unsaturated sulfur and use method of device

Abstract

The invention discloses a device for recycling sulfur from steam containing unsaturated sulfur and a using method thereof.The device comprises two sulfur recycling mechanisms capable of being alternately used, a liquid sulfur storage tank and a water-cooling sulfur fixing mechanism, a sulfur-free gas outlet is formed in the bottom of each sulfur recycling mechanism, and a three-stage heat exchange structure is arranged in each sulfur recycling mechanism; a liquid sulfur outlet is formed in the bottom pipe wall of the liquid sulfur storage tank and is communicated with the liquid sulfur storage tank; the water-cooling sulfur-fixing mechanism is connected with the bottom of the liquid sulfur storage tank, and a liquid sulfur spray head is arranged on a pipeline for connecting the top of the water-cooling sulfur-fixing mechanism with the liquid sulfur storage tank and is used for quenching and curing liquid sulfur into spherical sulfur particles. According to the invention, the gas containing unsaturated sulfur steam is subjected to quenching treatment by adopting three-stage dry cooling, so that the sulfur steam in the gas can be effectively condensed in the sulfur recovery device, and effective desulfurization treatment of the gas can be realized; and a reheating mode is adopted to remelt condensed sulfur solids, so that high-purity liquid sulfur can be recovered, and meanwhile, the blockage of granular sulfur to a pipeline is prevented.

Description

Technical Field

[0001] The invention relates to the technical field of atmosphere purification and environmental protection, and in particular to a device for recovering sulfur from unsaturated sulfur-containing steam and a method for using the device. Background Art

[0002] Among the technologies for desulfurization of blast furnace gas in China, converting sulfur pollutants in blast furnace gas into high-purity sulfur is an excellent technology for resource utilization of sulfur-containing waste gas. For example, the patents CN111748383B and CN111732975A, etc., which have been applied for, disclose their desulfurization process. The general practice is to first convert COS in the gas into H2S, and then partially oxidize H2S into sulfur for recovery. However, in the process of sulfur recovery, there is still a small amount of unsaturated sulfur vapor or particles in the tail gas that cannot be effectively recovered. The reason is: on the one hand, when the temperature of the tail gas is lower than 70°C, the sulfur particles in the gas will slowly block the pipeline, causing the internal pressure of the device to be too high, which may cause a safety accident; when the tail gas temperature is higher than 150°C, there is still a large amount of unsaturated sulfur vapor (greater than 2000ppm) in the gas that has not been effectively recovered, resulting in excessive sulfur content in the tail gas emissions. Summary of the invention

[0003] The present invention aims to solve the deficiencies of the prior art and provides a device for recovering sulfur from unsaturated sulfur vapor and a method for using the device. The gas containing unsaturated sulfur vapor is rapidly cooled by three-stage dry cooling, and the sulfur vapor in the gas can be effectively condensed in the sulfur recovery device, thereby achieving effective desulfurization of the gas. The condensed sulfur solid is re-melted by reheating, and high-purity liquid sulfur can be recovered, while preventing the granular sulfur from clogging the pipeline.

[0004] The present invention adopts the following technical solution:

[0005] A device for recovering sulfur from unsaturated sulfur-containing steam comprises at least two sulfur recovery mechanisms arranged in parallel and usable alternately, a liquid sulfur storage tank and a water-cooled sulfur-fixing mechanism arranged below the sulfur recovery mechanisms, the top of each of the sulfur recovery mechanisms is connected and then converged upward to form a sulfur-containing gas inlet, the bottom of each of the sulfur recovery mechanisms is necked and then extends to the side to form a sulfur-free gas outlet, and a gate valve is provided at each of the sulfur-free gas outlets; a heat exchange structure for dry quenching treatment to condense sulfur steam is provided inside the sulfur recovery mechanism; a liquid sulfur outlet is provided on the bottom pipe wall of each of the sulfur recovery mechanisms, and each of the liquid sulfur outlets is connected to the liquid sulfur storage tank for storing liquefied sulfur; the water-cooled sulfur-fixing mechanism is connected to the bottom of the liquid sulfur storage tank, and a liquid sulfur nozzle is provided on the pipeline connected to the liquid sulfur storage tank at the top of the water-cooled sulfur-fixing mechanism for quenching and solidifying the liquid sulfur into spherical sulfur particles.

[0006] Preferably, the sulfur recovery mechanism includes two with the same structure, namely a first sulfur recovery mechanism and a second sulfur recovery mechanism, which are used alternately as one cold and one hot for cooling and heating each other, and each of the sulfur recovery mechanisms is provided with a three-stage heat exchanger and three guide plates, and the three guide plates divide the sulfur recovery mechanism into four chambers from top to bottom, and each chamber is provided with a pressure gauge and a thermometer; when cooling, the sulfur vapor in the gas is condensed into solid sulfur and enriched on the surface of the heat exchanger; when heating, the solid sulfur enriched on the surface of the heat exchanger is liquefied into liquid sulfur, thereby collecting high-purity liquid sulfur into the liquid sulfur storage tank.

[0007] Preferably, the three-stage heat exchanger is respectively a first-stage heat exchanger, a second-stage heat exchanger and a third-stage heat exchanger from bottom to top. Cooling water or steam enters from the first-stage heat exchanger and passes through the second-stage heat exchanger and the third-stage heat exchanger in sequence, thereby achieving the dual effects of cooling and heating.

[0008] Preferably, an electric heating insulation layer is provided at the bottom of each of the sulfur recovery mechanisms, and a back-blowing microporous filter is installed at each sulfur-free gas outlet.

[0009] The outlet of the sulfur recovery mechanism is equipped with an induced draft fan back-blowing device, which is used to purge sulfur-free gas after sulfur melting is completed, thereby achieving cooling of the sulfur recovery mechanism and sulfur vapor purge. When sulfur melting is completed, sulfur-free gas can be purged from the sulfur recovery mechanism on the cold side to the sulfur recovery mechanism on the hot side, which can cool the sulfur recovery mechanism on the hot side on the one hand, and purge sulfur vapor remaining in the sulfur recovery mechanism on the other hand.

[0010] The liquid sulfur nozzle is located below the liquid sulfur storage tank and is connected through an inverted U-shaped pipe. The siphon principle is used to generate pressure to spray out the liquid sulfur. A linkage trigger switch is provided above the liquid sulfur nozzle, which is linked to the stirrer at the bottom of the water-cooled sulfur fixation mechanism. When liquid sulfur passes through, the stirrer automatically turns on. A constant temperature heating layer is provided on the outside of the liquid sulfur storage tank and the pipe connected to the liquid sulfur nozzle, and a pressure gauge is installed above the liquid sulfur storage tank to monitor the flow of sulfur to the liquid sulfur storage tank.

[0011] Preferably, the top of the inverted U-shaped pipe is lower than the top of the liquid sulfur storage tank and has a height difference of 1.5-2.5 meters with the bottom of the liquid sulfur storage tank.

[0012] The controlled temperature of the constant temperature heating layer is 130-135°C, ensuring that the sulfur in the pipeline is a liquid with good fluidity.

[0013] A first pressure gauge, a second pressure gauge, a third pressure gauge and a fourth pressure gauge are respectively arranged in four chambers from top to bottom in each of the sulfur recovery mechanisms; a first thermometer, a second thermometer, a third thermometer and a fourth thermometer are respectively arranged in four chambers from top to bottom in each of the sulfur recovery mechanisms; and a fifth pressure gauge is installed above the liquid sulfur storage tank.

[0014] A first gate valve is provided at the sulfur-free gas outlet on the first sulfur recovery mechanism, and a second gate valve is provided at the sulfur-free gas outlet on the second sulfur recovery mechanism.

[0015] The inner side of the water-cooled sulfur fixing mechanism is provided with a water temperature thermometer, the upper side is provided with a water inlet for replenishing chilled water, the water outlet is provided with a small particle filter screen, and the lower side is provided with a water outlet; when the water temperature of the water-cooled sulfur fixing mechanism exceeds 40°C, the water inlet is opened, cold water is replenished and injected, and warm water flows out from the water outlet; when the water temperature drops to 20°C, water replenishment is stopped.

[0016] A method for using a device for recovering sulfur from unsaturated sulfur vapor comprises the following steps:

[0017] S1. Open the first gate valve and close the second gate valve, so that the high-temperature gas containing unsaturated sulfur vapor is passed from the sulfur-containing gas inlet to the three-stage heat exchanger in the first sulfur recovery mechanism for dry quenching, so that the sulfur vapor in the gas is condensed in the first sulfur recovery mechanism, and the sulfur-free sulfur gas is discharged from the sulfur-free gas outlet on the first sulfur recovery mechanism;

[0018] S2. When the solid sulfur collected in the first sulfur recovery mechanism reaches a set amount, the first gate valve is closed, the second gate valve is opened, and the second sulfur recovery mechanism is switched to collect the solid sulfur; the first sulfur recovery mechanism performs heat treatment to melt the sulfur, and the liquid sulfur is collected in a liquid sulfur storage tank;

[0019] S3. When the liquid sulfur level in the liquid sulfur storage tank reaches the set height, the liquid sulfur automatically flows into the water-cooled sulfur solidification mechanism through the liquid sulfur nozzle, and is rapidly cooled by cold water to directly obtain spherical sulfur particles of a certain size.

[0020] The temperature of the high-temperature gas containing unsaturated sulfur vapor in step S1 is 150-250°C.

[0021] In the three-stage heat exchanger described in step S1, cooling water or steam enters the second-stage heat exchanger from the first-stage heat exchanger and finally comes out of the third-stage heat exchanger, which can achieve the dual functions of cooling and heating; when it is used as a cooling device, cold water can be passed in; when it is used as a heater, high-temperature steam can be passed in.

[0022] In the step S2, the first sulfur recovery mechanism is activated when heat treating molten sulfur as molten sulfur, and the insulation temperature is 130-135°C.

[0023] In step S3, when the pressure of the fifth pressure gauge in the liquid sulfur storage tank is greater than the pressure value of the fourth pressure gauge in the first sulfur recovery mechanism, it indicates that liquid sulfur in the first sulfur recovery mechanism flows into the liquid sulfur storage tank; when the pressure of the fifth pressure gauge is equal to the pressure value of the fourth pressure gauge, it indicates that no liquid sulfur flows into the liquid sulfur storage tank.

[0024] The liquid sulfur in the liquid sulfur storage tank enters the water-cooled sulfur-solidifying mechanism intermittently through the liquid sulfur nozzle. Only when the height of the liquid sulfur in the liquid sulfur storage tank is higher than the height of the inverted U-tube, the liquid sulfur will enter the water-cooled sulfur-solidifying mechanism through the liquid sulfur nozzle. When the liquid sulfur in the liquid sulfur storage tank is exhausted and there is no liquid sulfur in the inverted U-tube, no liquid sulfur will flow out of the liquid sulfur nozzle. At this time, the liquid sulfur storage tank is in a state of collecting liquid sulfur. Only when the height of the liquid sulfur in the liquid sulfur storage tank is higher than the height of the inverted U-tube again, the liquid sulfur nozzle will flow out liquid sulfur again, and the cycle will continue.

[0025] Each time the liquid sulfur storage tank is emptied of liquid sulfur, the solid spherical sulfur in the water-cooled sulfur-solidifying mechanism can be discharged from the bottom, and the particle size of the solid sulfur can be adjusted by the aperture of the liquid sulfur nozzle.

[0026] The technical solution of the present invention has the following advantages:

[0027] A. The method of collecting sulfur by three-stage heat exchange dry cooling and segmented condensation can greatly improve the desulfurization efficiency and sulfur yield of blast furnace gas. The principle is as follows: through the third stage cooling, the gas is first cooled to between 80-120°C; then through the second stage cooling, the gas is further cooled to between 40-80°C; finally, through the first stage cooling, the gas is cooled to between 20-40°C, which can reduce the sulfur concentration in the gas to below 2ppm. Then, the condensed sulfur is melted into liquid and discharged by heating the molten sulfur, so as to achieve the purpose of recovering high-purity liquid sulfur and prevent the granular sulfur from blocking the pipeline.

[0028] B. The present invention adopts a method of collecting sulfur by alternating between cold and hot to achieve continuous removal of sulfur-containing gas.

[0029] C. The present invention adopts a shower-type liquid sulfur nozzle to discharge liquid sulfur to cold water for rapid cooling and solidification treatment, and can directly obtain 2-4 mm spherical sulfur solids, and the purity of the sulfur is greater than 99.5%. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the specific embodiments of the present invention, the drawings required for use in the specific embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0031] Figure 1 The figure is a schematic diagram of the overall structure of the device for recovering sulfur from unsaturated sulfur-containing steam according to the present invention.

[0032] The following are marked in the figure:

[0033] 1-Sulfur recovery mechanism, 1A-first sulfur recovery mechanism, 1B-second sulfur recovery mechanism, 11-sulfur-containing gas inlet, 12-sulfur-free gas outlet, 121-first gate valve, 122-second gate valve, 13-liquid sulfur outlet, 14-heat exchanger, 141-first stage heat exchanger, 142-second stage heat exchanger, 143-third stage heat exchanger, 15-guide plate, 16-electric heating insulation layer, 17-microporous filter; 2-liquid sulfur storage tank, 21-constant temperature heating layer; 3-water-cooled sulfur fixing mechanism, 31-liquid sulfur nozzle, 32-trigger switch, 33-mixer, 34-water temperature thermometer, 35-water inlet, 36-water outlet; 4-induced draft fan backblowing device;

[0034] P1-first pressure gauge, P2-second pressure gauge, P3-third pressure gauge, P4-fourth pressure gauge, P5-fifth pressure gauge;

[0035] T1-first thermometer, T2-second thermometer, T3-third thermometer, T4-fourth thermometer;

[0036] K1-first cut-off valve, K2-second cut-off valve, K3-third cut-off valve, K4-fourth cut-off valve, K5-fifth cut-off valve, K6-sixth cut-off valve, K7-seventh cut-off valve, K8-eighth cut-off valve. DETAILED DESCRIPTION

[0037] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] like Figure 1As shown, the present invention provides a device for recovering sulfur from unsaturated sulfur vapor, comprising at least two sulfur recovery mechanisms 1 arranged in parallel and used interchangeably, a liquid sulfur storage tank 2 arranged below the sulfur recovery mechanism 1, and a water-cooled sulfur-solidifying mechanism 3. The top of each sulfur recovery mechanism 1 is connected and then converged upward to form a sulfur-containing gas inlet 11. The bottom of each sulfur recovery mechanism 1 is necked and then extends to the side to form a sulfur-free gas outlet 12, and a gate valve is provided at each sulfur-free gas outlet 12. A heat exchange structure for dry quenching treatment to condense sulfur vapor is provided inside the sulfur recovery mechanism 1. A liquid sulfur outlet 13 is provided on the bottom pipe wall of each sulfur recovery mechanism 1, and each liquid sulfur outlet 13 is connected to the liquid sulfur storage tank 2 for storing liquefied sulfur. The water-cooled sulfur-solidifying mechanism 3 is connected to the bottom of the liquid sulfur storage tank 2, and a liquid sulfur nozzle 31 is provided on the pipeline connected to the liquid sulfur storage tank 2 at the top of the water-cooled sulfur-solidifying mechanism 3, which is used to quench and solidify the liquid sulfur into spherical sulfur particles.

[0039] Furthermore, the sulfur recovery mechanism 1 includes two identical structures, namely the first sulfur recovery mechanism 1A and the second sulfur recovery mechanism 1B, which are used alternately as one cold and one hot for cooling and heating each other, and each sulfur recovery mechanism 1 is provided with a three-stage heat exchanger 14 and three guide plates 15, and the three guide plates 15 divide the sulfur recovery mechanism 1 into four chambers from top to bottom, and each chamber is provided with a pressure gauge and a thermometer. When cooling, the sulfur vapor in the gas is condensed into sulfur solid, which is enriched on the surface of the heat exchanger 15; when heating, the solid sulfur enriched on the surface of the heat exchanger 15 is liquefied into liquid sulfur, thereby collecting high-purity liquid sulfur into the liquid sulfur storage tank 2.

[0040] The three-stage heat exchanger 14 is respectively composed of the first-stage heat exchanger 141, the second-stage heat exchanger 142 and the third-stage heat exchanger 143 from bottom to top. The cooling water or steam enters from the first-stage heat exchanger 141, passes through the second-stage heat exchanger 142 and the third-stage heat exchanger 143 in sequence, and realizes the dual functions of cooling and heating. The method of collecting sulfur by three-stage heat exchange dry cooling and segmented condensation can greatly improve the desulfurization efficiency and sulfur yield of blast furnace gas. The principle is as follows: through the third-stage cooling, the gas is first cooled to between 80-120°C; then through the second-stage cooling, the gas is further cooled to between 50-80°C; finally, through the first-stage cooling, the gas is cooled to between 30-50°C, and the concentration of sulfur in the gas can be reduced to below 2ppm. Then, the condensed sulfur is melted into liquid and discharged by heating the molten sulfur, so as to achieve the purpose of recovering high-purity liquid sulfur and prevent the granular sulfur from blocking the pipeline.

[0041] An electric heating insulation layer 16 is provided at the bottom of each sulfur recovery mechanism 1, and a microporous filter 17 capable of back-blowing is installed at each sulfur-free gas outlet 12. An induced draft fan back-blowing device 4 is installed at the outlet of the sulfur recovery mechanism 1, which is used to purge the sulfur-free gas after sulfur melting is completed, so as to achieve cooling and sulfur vapor purge of the sulfur recovery mechanism 1. When sulfur melting is completed, sulfur-free gas can be purged from a cold sulfur recovery mechanism to a hot sulfur recovery mechanism, which can cool the hot sulfur recovery mechanism on the one hand, and purge the sulfur vapor remaining in the sulfur recovery mechanism on the other hand.

[0042] The liquid sulfur nozzle 31 is located below the liquid sulfur storage tank 2 and is connected through an inverted U-shaped pipe. The siphon principle is used to generate pressure to spray the liquid sulfur. A linkage trigger switch 32 is provided above the liquid sulfur nozzle 31, which is linked to the mixer 33 at the bottom of the water-cooled sulfur-fixing mechanism 3. When the liquid sulfur passes through, the mixer 33 automatically turns on. The liquid sulfur storage tank 2 and the outer side of the pipe connected to the liquid sulfur nozzle 31 are equipped with a constant temperature heating layer 21, and a pressure gauge is installed above the liquid sulfur storage tank 2 to monitor the flow of sulfur to the liquid sulfur storage tank 2. The top of the inverted U-shaped pipe is lower than the top of the liquid sulfur storage tank 2 and the height difference with the bottom of the liquid sulfur storage tank 2 is 1.5-2.5 meters. The control temperature of the constant temperature heating layer 21 is 130-135°C to ensure that the sulfur in the pipe is a liquid with good fluidity.

[0043] The four chambers from top to bottom in each sulfur recovery mechanism 1 are respectively provided with a first pressure gauge P1, a second pressure gauge P2, a third pressure gauge P3 and a fourth pressure gauge P4; the four chambers from top to bottom in each sulfur recovery mechanism 1 are respectively provided with a first thermometer T1, a second thermometer T2, a third thermometer T3 and a fourth thermometer T4; a fifth pressure gauge P5 is installed above the liquid sulfur storage tank 2. A first gate valve 121 is provided at the sulfur-free gas outlet 12 on the first sulfur recovery mechanism 1A, and a second gate valve 122 is provided at the sulfur-free gas outlet 12 on the second sulfur recovery mechanism 1B.

[0044] The inner side of the water-cooled sulfur fixing mechanism 3 is provided with a water temperature thermometer 34, the upper side is provided with a water inlet 35 for replenishing chilled water, the water outlet is provided with a small particle filter, and the lower side is provided with a water outlet 36. When the water temperature of the water-cooled sulfur fixing mechanism 3 exceeds 40°C, the water inlet 35 is opened, cold water is replenished and injected, and warm water flows out from the water outlet 36; when the water temperature drops to 20°C, water replenishment is stopped.

[0045] The present invention also provides a method for using a device for recovering sulfur from unsaturated sulfur vapor, comprising the following steps:

[0046] S1. Open the first gate valve 121 and close the second gate valve 122, so that the high-temperature gas containing unsaturated sulfur vapor is passed from the sulfur-containing gas inlet 11 to the three-stage heat exchanger 14 in the first sulfur recovery mechanism 1A for dry quenching, so that the sulfur vapor in the gas is condensed in the first sulfur recovery mechanism 1A, and the sulfur-free sulfur gas is discharged from the sulfur-free gas outlet 12 on the first sulfur recovery mechanism 1A;

[0047] S2. When the solid sulfur collected in the first sulfur recovery mechanism 1A reaches a set amount, the first gate valve 121 is closed, the second gate valve 122 is opened, and the second sulfur recovery mechanism 1B is switched to collect the solid sulfur; the first sulfur recovery mechanism 1A performs heat treatment to melt the sulfur, and the liquid sulfur is collected in the liquid sulfur storage tank 2;

[0048] S3. When the liquid sulfur level in the liquid sulfur storage tank 2 reaches a set height, the liquid sulfur automatically flows into the water-cooled sulfur-solidifying mechanism 3 through the liquid sulfur nozzle 31, and is rapidly cooled by cold water to directly obtain spherical sulfur particles of a certain size.

[0049] The temperature of the high-temperature gas containing unsaturated sulfur vapor in step S1 is 150-250° C. In the three-stage heat exchanger 14 in step S1, cooling water or steam enters the second-stage heat exchanger 142 from the first-stage heat exchanger 141 and finally exits from the third-stage heat exchanger 143, which can achieve the dual functions of cooling and heating; when it is used as a cooling device, cold water can be introduced; when it is used as a heater, high-temperature steam can be introduced.

[0050] In step S2, the first sulfur recovery mechanism 1A is activated when heat treating molten sulfur as molten sulfur, and the insulation temperature is 130-135°C.

[0051] In step S3, when the pressure of the fifth pressure gauge P5 in the liquid sulfur storage tank 2 is greater than the pressure value of the fourth pressure gauge P4 in the first sulfur recovery mechanism 1A, it means that liquid sulfur in the first sulfur recovery mechanism 1A flows into the liquid sulfur storage tank 2; when the pressure of the fifth pressure gauge P5 is equal to the pressure value of the fourth pressure gauge P4, it means that no liquid sulfur flows into the liquid sulfur storage tank 2.

[0052] The liquid sulfur in the liquid sulfur storage tank 2 enters the water-cooled sulfur-fixing mechanism 3 intermittently through the liquid sulfur nozzle 31. Only when the liquid sulfur level in the liquid sulfur storage tank 2 is higher than the height of the inverted U-tube, the liquid sulfur will enter the water-cooled sulfur-fixing mechanism 3 through the liquid sulfur nozzle 31. When the liquid sulfur in the liquid sulfur storage tank 2 is exhausted and there is no liquid sulfur in the inverted U-tube, no liquid sulfur will flow out of the liquid sulfur nozzle 31. At this time, the liquid sulfur storage tank 2 is in a state of collecting liquid sulfur. Only when the liquid sulfur level in the liquid sulfur storage tank 2 is higher than the height of the inverted U-tube again, the liquid sulfur nozzle 31 will flow out liquid sulfur again, and the cycle continues.

[0053] After the liquid sulfur storage tank 2 is emptied of liquid sulfur each time, the solid spherical sulfur in the water-cooled sulfur-fixing mechanism 3 can be discharged through the bottom, and the particle size of the solid sulfur can be adjusted by the aperture of the liquid sulfur nozzle 31 .

[0054] Three specific application examples are given below.

[0055] Embodiment 1:

[0056] 1 t / h of 25°C cooling water is introduced into the heat exchanger of the first sulfur recovery structure 1A, the gate valve 121 is opened, the gate valve 122 is closed, and 2000 Nm 3 / h, 180℃ gas containing unsaturated sulfur vapor. After heat exchange cooling, the high-temperature gas drops rapidly: the second thermometer T2 = between 110-120℃; the third thermometer T3 = between 50-60℃; the fourth thermometer T4 = between 25-30℃; after the gas is stably introduced for 46 hours, when the first pressure gauge P1 in the first sulfur recovery structure 1A reaches 10.5Kpa, slowly open the gate valve 122, close the gate valve 121 at the same time, and switch to the second sulfur recovery structure 1B for collection; the sulfur content in the gas after desulfurization treatment is less than 2ppm.

[0057] The first sulfur recovery structure 1A performs heat treatment to melt sulfur: the cooling water in the first sulfur recovery structure 1A is turned off, and 150°C water vapor is introduced to heat the melted sulfur. At the same time, the electric heating insulation layer 16 at the bottom of the first sulfur recovery structure 1A is set at 130°C for insulation. After about 4 hours, the fifth shut-off valve K5 is opened to allow the liquid sulfur to flow into the liquid sulfur storage tank 2. At this time, the fourth pressure gauge P4 = 5.1Kpa, and the fifth pressure gauge P5 = 35.5Kpa; when the P5 pressure drops to 5.1Kpa, it means that all the liquid sulfur in the first sulfur recovery structure 1A flows into the liquid sulfur storage tank 2, and the fifth shut-off valve K5 is closed. The steam heating of the three-stage heat exchanger of the first sulfur recovery structure 1A is turned off, and then the first shut-off valve K1 and the fourth shut-off valve K4 are closed, and the second shut-off valve K2 and the third shut-off valve K3 are opened, and the back-blowing machine is started for purging. When T4 drops to 60°C, the purging is completed. The first sulfur recovery structure 1A processes the state of sulfur to be collected. The liquid sulfur storage tank 2 is set at a constant temperature of 135°C. When the liquid sulfur level inside exceeds the height of the inverted U-pipe, the liquid sulfur will automatically flow into the water-cooled sulfur fixing mechanism 3 through the liquid sulfur nozzle 31 (aperture 2.5mm), and spherical sulfur particles with a diameter of about 2-3mm are directly obtained after being rapidly cooled by cold water.

[0058] Embodiment 2:

[0059] 1 t / h of 20°C cooling water is introduced into the heat exchanger of the second sulfur recovery structure 1B, the gate valve 122 is opened, the gate valve 121 is closed, and 2200 Nm 3 / h, 150℃ gas containing unsaturated sulfur vapor. After heat exchange cooling, the high-temperature gas drops rapidly: the second thermometer T2 = between 100-110℃; the third thermometer T3 = between 48-57℃; the fourth thermometer T4 = between 22-25℃; after the gas is stably introduced for 75 hours, when the first pressure gauge P1 in the second sulfur recovery structure 1B reaches 10.5Kpa; slowly open the gate valve 121, close the gate valve 122 at the same time, and switch to the first sulfur recovery structure 1A for collection; the sulfur content in the gas after desulfurization treatment is less than 2ppm.

[0060] The second sulfur recovery structure 1B performs heat treatment to melt sulfur: the cooling water in the second sulfur recovery structure 1B is turned off, and 150°C water vapor is introduced to heat the melted sulfur. At the same time, the electric heating insulation layer 16 at the bottom of the second sulfur recovery structure 1B is set at 130°C for insulation. After about 5 hours, the sixth shut-off valve K6 is opened to allow the liquid sulfur to flow into the liquid sulfur storage tank 2. At this time, the fourth pressure gauge P4 = 5.5Kpa, and the fifth pressure gauge P5 = 35.2Kpa; when the P5 pressure drops to 5.5Kpa, it means that all the liquid sulfur in the second sulfur recovery structure 1B flows into the liquid sulfur storage tank 2, and the sixth shut-off valve K6 is closed. The steam heating of the three-stage heat exchanger of the second sulfur recovery structure 1B is turned off, and then the second shut-off valve K2 and the third shut-off valve K3 are closed, the first shut-off valve K1 and the fourth shut-off valve K4 are opened, and the back-blowing machine is started for purging. When T4 drops to 50°C, the purging is completed. The second sulfur recovery structure 1B processes the state of sulfur to be collected. The liquid sulfur storage tank 2 is set at a constant temperature of 135° C. When the liquid sulfur level inside exceeds the height of the inverted U-pipe, the liquid sulfur will automatically flow into the water-cooled sulfur fixing mechanism 3 through the liquid sulfur nozzle 31 (aperture 2 mm), and spherical sulfur particles with a diameter of about 2-3 mm are directly obtained after being rapidly cooled by cold water.

[0061] Embodiment 3:

[0062] 1t / h of 10°C cooling water is introduced into the heat exchanger of the first sulfur recovery structure 1A, the gate valve 121 is opened, the gate valve 122 is closed, and 1500Nm 3 / h, 200℃ containing gas without saturated sulfur vapor. After heat exchange cooling, the high-temperature gas drops rapidly: the second thermometer T2 = between 120-130℃; the third thermometer T3 = between 60-70℃; the fourth thermometer T4 = between 20-25℃; after the gas is stably introduced for 52 hours, when the first pressure gauge P1 in the first sulfur recovery structure 1A reaches 10.5Kpa; slowly open the gate valve 122, close the gate valve 121 at the same time, and switch to the second sulfur recovery structure 1B for collection; the sulfur content in the gas after desulfurization treatment is less than 1ppm.

[0063] The first sulfur recovery structure 1A performs heat treatment to melt sulfur: the cooling water in the first sulfur recovery structure 1A is turned off, and 150°C steam is introduced to heat the melted sulfur. At the same time, the electric heating insulation layer 16 at the bottom of the first sulfur recovery structure 1A is set at 130°C for insulation. After about 4.5 hours, the fifth shut-off valve K5 is opened to allow the liquid sulfur to flow into the sulfur storage tank. At this time, the fourth pressure gauge P4 = 5.0Kpa, and the fifth pressure gauge P5 = 35.6Kpa; when the P5 pressure drops to 5.0Kpa, it means that all the liquid sulfur in the first sulfur recovery structure 1A flows into the sulfur storage tank, and the fifth shut-off valve K5 is closed. The steam heating of the three-stage heat exchanger of the first sulfur recovery structure 1A is turned off, and then the first shut-off valve K1 and the fourth shut-off valve K4 are closed, the second shut-off valve K2 and the third shut-off valve K3 are opened, and the back-blowing machine is started for purging. When T4 drops to 55°C, the purging is completed. The first sulfur recovery structure 1A processes the state of sulfur to be collected. The liquid sulfur storage tank 2 is set at a constant temperature of 135° C. When the liquid sulfur level inside exceeds the height of the inverted U-pipe, the liquid sulfur will automatically flow into the water-cooled sulfur fixing mechanism 3 through the liquid sulfur nozzle 31 (aperture 3 mm), and spherical sulfur particles with a diameter of about 3-4 mm are directly obtained after being rapidly cooled by cold water.

[0064] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. However, the obvious changes or modifications derived therefrom are still within the scope of protection of the present invention.

Claims

1. A device for recovering sulfur from unsaturated sulfur vapor, characterized in that: The invention comprises at least two sulfur recovery mechanisms (1) which are arranged in parallel and can be used interchangeably, a liquid sulfur storage tank (2) and a water-cooled sulfur fixing mechanism (3) which are arranged below the sulfur recovery mechanism (1), the tops of each of the sulfur recovery mechanisms (1) are connected and converge upward to form a sulfur-containing gas inlet (11), the bottom of each of the sulfur recovery mechanisms (1) is necked and extends laterally to form a sulfur-free gas outlet (12), and a gate valve is arranged at each of the sulfur-free gas outlets (12); the sulfur recovery mechanism (1) is provided with a A heat exchange structure for dry quenching treatment to condense sulfur vapor is provided; a liquid sulfur outlet (13) is provided on the bottom pipe wall of each sulfur recovery mechanism (1), and each liquid sulfur outlet (13) is connected to the liquid sulfur storage tank (2) for storing liquefied sulfur; the water-cooled sulfur-fixing mechanism (3) is connected to the bottom of the liquid sulfur storage tank (2), and a liquid sulfur nozzle (31) is provided on the pipeline connected to the liquid sulfur storage tank (2) at the top of the water-cooled sulfur-fixing mechanism (3), for quenching and solidifying the liquid sulfur into spherical sulfur particles.

2. The device according to claim 1, characterized in that The sulfur recovery mechanism (1) comprises two identical structures, namely a first sulfur recovery mechanism (1A) and a second sulfur recovery mechanism (1B), which are used as a cold mechanism and a hot mechanism to cool and heat each other alternately, and each of the sulfur recovery mechanisms (1) is provided with a three-stage heat exchanger (14) and three guide plates (15) inside, and the three guide plates (15) divide the sulfur recovery mechanism (1) into four chambers from top to bottom, and each chamber is provided with a pressure gauge and a thermometer.

3. The device according to claim 2, characterized in that The three-stage heat exchanger (14) comprises, from bottom to top, a first-stage heat exchanger (141), a second-stage heat exchanger (142) and a third-stage heat exchanger (143). Cooling water or steam enters from the first-stage heat exchanger (141), passes through the second-stage heat exchanger (142) and the third-stage heat exchanger (143) in sequence, and realizes the dual functions of cooling and heating.

4. The device according to claim 1, characterized in that The bottom of each sulfur recovery mechanism (1) is provided with an electric heating insulation layer (16), and a back-blowing microporous filter (17) is installed at each sulfur-free gas outlet (12); The outlet of the sulfur recovery mechanism (1) is provided with an induced draft fan back-blowing device (4) for blowing out sulfur-free gas after sulfur melting is completed, thereby achieving cooling of the sulfur recovery mechanism (1) and sulfur steam blowing.

5. The device according to claim 1, characterized in that The liquid sulfur nozzle (31) is located below the liquid sulfur storage tank (2) and is connected via an inverted U-shaped pipe. The liquid sulfur is sprayed out by generating pressure based on the siphon principle. A linkage trigger switch (32) is provided above the liquid sulfur nozzle (31) and is linked to a stirrer (33) at the bottom of the water-cooled sulfur fixing mechanism (3). When liquid sulfur passes through, the stirrer (33) is automatically turned on. A constant temperature heating layer (21) is provided on the outside of the liquid sulfur storage tank (2) and the pipe connected to the liquid sulfur nozzle (31). A pressure gauge is installed above the liquid sulfur storage tank (2) to monitor the flow of sulfur to the liquid sulfur storage tank (2).

6. The device according to claim 5, characterized in that The top of the inverted U-shaped pipeline is lower than the top of the liquid sulfur storage tank (2) and has a height difference of 1.5-2.5 meters from the bottom of the liquid sulfur storage tank (2); The controlled temperature of the constant temperature heating layer (21) is 130-135°C, ensuring that the sulfur in the pipeline is a liquid with good fluidity.

7. The device according to claim 1, characterized in that The inner side of the water-cooled sulfur fixing mechanism (3) is provided with a water temperature measuring meter (34), the upper side is provided with a water inlet (35) for replenishing chilled water, and the lower side is provided with a water outlet (36).

8. A method for using a device for recovering sulfur from unsaturated sulfur vapor, characterized in that: The following steps are involved: S1, opening the first gate valve (121) and closing the second gate valve (122), so that the high-temperature gas containing unsaturated sulfur vapor is passed from the sulfur-containing gas inlet (11) into the three-stage heat exchanger (14) in the first sulfur recovery mechanism (1A) for dry quenching treatment, so that the sulfur vapor in the gas is condensed in the first sulfur recovery mechanism (1A), and the sulfur-free sulfur gas is discharged from the sulfur-free gas outlet (12) on the first sulfur recovery mechanism (1A); S2. When the solid sulfur collected in the first sulfur recovery mechanism (1A) reaches a set amount, the first gate valve (121) is closed, the second gate valve (122) is opened, and the second sulfur recovery mechanism (1B) is switched to collect the solid sulfur; the first sulfur recovery mechanism (1A) performs heat treatment to melt the sulfur, and the liquid sulfur is collected in the liquid sulfur storage tank (2); S3. When the liquid sulfur level in the liquid sulfur storage tank (2) reaches a set height, the liquid sulfur automatically flows into the water-cooled sulfur fixing mechanism (3) through the liquid sulfur nozzle (31), and is rapidly cooled by cold water to directly obtain spherical sulfur particles of a certain size.

9. The method for using the device for recovering sulfur from unsaturated sulfur vapor according to claim 8, characterized in that: The temperature of the high-temperature gas containing unsaturated sulfur vapor in step S1 is 150-250°C.

10. The method for using the device for recovering sulfur from unsaturated sulfur vapor according to claim 8, characterized in that: In the three-stage heat exchanger (14) described in step S1, cooling water or steam enters the second-stage heat exchanger (142) from the first-stage heat exchanger (141) and finally exits from the third-stage heat exchanger (143), thereby achieving the dual functions of cooling and heating. When it is used as a cooling device, cold water can be introduced; when it is used as a heater, high-temperature steam can be introduced.

11. The method for using the device for recovering sulfur from unsaturated sulfur-containing steam according to claim 8, characterized in that: In the step S2, the first sulfur recovery mechanism (1A) is activated when heat treating molten sulfur as molten sulfur, and the insulation temperature is 130-135°C.

12. The method for using the device for recovering sulfur from unsaturated sulfur-containing steam according to claim 8, characterized in that: In the step S3, when the pressure of the fifth pressure gauge (P5) in the liquid sulfur storage tank (2) is greater than the pressure value of the fourth pressure gauge (P4) in the first sulfur recovery mechanism (1A), it indicates that liquid sulfur in the first sulfur recovery mechanism (1A) flows into the liquid sulfur storage tank (2); when the pressure of the fifth pressure gauge (P5) is equal to the pressure value of the fourth pressure gauge (P4), it indicates that no liquid sulfur flows into the liquid sulfur storage tank (2).

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