Sulfur melting kettle and preparation method thereof as well as steam heating and condensed water recycling system and method

Abstract

The invention relates to a heating device of a sulfur melting process, in particular to a sulfur melting kettle and a preparation method thereof, and a steam heating and condensed water recycling system and method, and aims to solve the problems that a coil heating pipeline system in a sulfur melting kettle in a sulfur melting steam system of an existing sulfur melting process is too high in steam energy consumption, unsmooth in water drainage and low in energy consumption. And the recycling rate of the condensed water is low. A siphon and a hose are arranged in an outlet vertical section of each heating coil of the sulfur melting kettle, a sealing flange and a drain valve assembly are sequentially arranged on each siphon in the conveying direction, and each sealing flange is located between the output end of the corresponding outlet vertical section and the corresponding siphon and used for preventing steam from overflowing from the output end of the corresponding outlet vertical section and keeping steam pressure. A steam pipe connector is arranged on the side wall of the outlet vertical section and used for discharging steam in the siphon, and the drain valve assembly is used for discharging condensed water in the siphon and keeping steam pressure.

Description

Technical Field

[0001] The present invention relates to a heating device for a sulfur melting process, and particularly to a sulfur melting kettle, a preparation method thereof, a steam heating and condensate recovery system, and a method. Background Art

[0002] The steam energy consumption in the precious metal enrichment workshop is the main energy consumption source in the sulfur melting process. The steam output from the steam main pipe is divided into three paths through a steam distribution cylinder, and about 80% of the steam enters the sulfur melting steam system. Referring to Figure 1 and Figure 2 , the sulfur melting steam system includes a plurality of sulfur melting kettles 01, a main condensate water pipeline 03, a return water main pipe 04, a steam-water separator 05, a steam discharge port 06, and a water collection tank 07; each sulfur melting kettle 01 is provided with a coil heating pipeline system 02, and a plurality of coil heating pipeline systems 02 are connected in parallel; each coil heating pipeline system 02 includes a plurality of coils connected in parallel, and the output ends of the plurality of coils are all connected to the main condensate water pipeline 03, and then are transported to the steam-water separator 05 outside the precious metal enrichment workshop through the return water main pipe 04, wherein the steam is discharged to the atmosphere through the steam discharge port 06 arranged at the top of the precious metal enrichment workshop, and the condensate water is recovered through the water collection tank 07 arranged below the steam-water separator 05. Since a large amount of heating steam flows out without being fully condensed when passing through the coil heating pipeline system 02, the latent heat of condensation of the steam is not effectively utilized, resulting in a relatively high energy consumption of the sulfur melting steam system.

[0003] In addition to the problem of high steam energy consumption, there is also a problem of poor hydrophobicity in the operation of the coil heating pipeline system 02 in the current sulfur melting kettle 01. Due to different pipe resistance characteristics caused by differences in the condensation heat transfer rate of each coil, pipe length, pipe surface smoothness, etc., it is easy for the steam in the high-pressure unit to block the flow of the low-pressure unit, resulting in poor hydrophobicity of some coils in the same coil heating pipeline system 02. And the return water main pipe 04 connecting the main condensate water pipeline 03 and the steam-water separator 05 needs to climb from a low position to a high position with a height difference of about 3 meters, which further exacerbates the problem of poor hydrophobicity.

[0004] To avoid poor hydrophobicity in the operation of the coil heating pipeline system 02 in the sulfur melting kettle 01, it is necessary to manually check regularly whether the coil heating pipeline system 02 is draining water normally. The method is to apply solid sulfur on the outlet pipeline of the coil. If it is found that the applied sulfur powder does not melt, it indicates that the coil is blocked by accumulated water and stops working. At this time, it is necessary to close the coils in the same coil heating pipeline system 02, and then reopen the coils in the same coil heating pipeline system 02 after the blocked coil works normally. However, since the phenomenon of water accumulation and blockage in the coil heating pipeline system 02 is likely to occur and it is difficult to check and dredge it in a timely manner all the time, this not only makes it difficult to ensure the effective operation of the sulfur melting steam system, but also greatly increases the labor intensity of production workers.

[0005] To slow down the water accumulation and blockage in the coil heating pipeline system 02 inside the sulfur melting kettle 01, a discharge port can be opened near the steam-water separator 05 on the return water main pipe 04 to discharge steam. However, the steam discharged from this discharge port is usually in a jet state with a very high flow rate, so it will generate extremely high pneumatic noise, which is harmful to the hearing and physical and mental health of on-site production personnel.

[0006] In addition, due to the water accumulation and blockage in the coil heating pipeline systems 02 of multiple sulfur melting kettles 01, the condensate that the condensate tank 07 can recover is also significantly reduced, resulting in a waste of water resources. Summary of the Invention

[0007] The object of the present invention is to solve the deficiencies of high steam energy consumption, poor hydrophobicity, and low condensate recovery utilization rate in the coil heating pipeline system inside the sulfur melting kettle in the sulfur melting steam system of the existing sulfur melting process, and to provide a sulfur melting kettle and its preparation method, a steam heating and condensate recovery system and method.

[0008] In order to solve the above deficiencies of the existing technology, the present invention provides the following technical solutions:

[0009] A sulfur melting kettle includes a shell and a coil heating pipeline system arranged inside the shell. The coil heating pipeline system includes a plurality of heating coils connected in parallel; each of the heating coils is a U-shaped structure with an opening upward, and includes an inlet vertical section, an intermediate horizontal section, and an outlet vertical section connected in sequence;

[0010] The special feature is that a siphon and a hose are inserted into the outlet vertical section, and a steam pipe interface is arranged on the side wall of the outlet vertical section; the input end of the hose extends into the intermediate horizontal section, the output end is connected to the input end of the siphon, the input end of the siphon is inserted into the outlet vertical section, and the output end of the siphon extends out of the shell for outputting condensate; the steam pipe interface is connected to a heating steam pipe, and the output end of the heating steam pipe extends out of the shell for outputting steam;

[0011] A sealing flange and a steam trap assembly are sequentially arranged on the siphon along the conveying direction. The sealing flange is located inside the shell and is arranged between the output end of the outlet vertical section and the siphon. The steam trap assembly is located outside the shell to ensure the stability of the steam phase change pressure.

[0012] Further, the siphon includes an insertion section, an outlet section, and a hydrophobic section connected in sequence along the conveying direction; the insertion section is located inside the outlet vertical section, and the output end of the insertion section is provided with the sealing flange; the input end of the outlet section is located inside the shell, the output end is located outside the shell, the height of the outlet section is lower than the height of the output end of the heating steam pipe, the height of the output end of the hydrophobic section is lower than the height of the output end of the insertion section, and a steam trap assembly is arranged on the hydrophobic section.

[0013] Further, the steam trap assembly includes a first pressure gauge, a first steam trap, a second steam trap, and a second pressure gauge that are sequentially arranged along the conveying direction.

[0014] Further, the coiled pipe heating pipeline system further includes at least one heat preservation tracing coil that is connected in parallel with a plurality of heating coils. The input end of the heat preservation tracing coil enters the housing from the input end of the inlet vertical section, and sequentially follows the inlet vertical section, the middle horizontal section, and the outlet vertical section, and then turns back from the output end of the outlet vertical section. Its output end extends out from the bottom of the housing and is connected with a heat preservation steam pipe. A heat preservation steam trap is arranged on the heat preservation steam pipe for outputting condensed water.

[0015] Meanwhile, the present invention also provides a preparation method of a sulfur melting kettle, which is characterized in that it includes the following steps:

[0016] Step 1: Select an existing sulfur melting kettle and use its outer shell as the above-mentioned housing;

[0017] Step 2: Cut off each heating coil in the housing obtained in Step 1 at its output end to obtain an outlet vertical section, and set a steam pipe interface on the side wall of the outlet vertical section near the output end of the outlet vertical section;

[0018] Step 3: Prepare siphons with a quantity equal to the number of heating coils and a length longer than the length of the outlet vertical section, and connect a hose to the input end of the siphon;

[0019] Step 4: Insert the siphons and hoses obtained in Step 3 into the heating coils from the output ends of the outlet vertical sections of each heating coil, and make the input end of the hose extend into the middle horizontal section of each heating coil, and the output end of the siphon extend out of the housing; then set a sealing flange between the output end of the outlet vertical section and the siphon, connect a heating steam pipe to the steam pipe interface, and make the output end of the heating steam pipe extend out of the housing to complete the preparation of the sulfur melting kettle.

[0020] Meanwhile, the present invention also provides a steam heating and condensed water recovery system, which is characterized in that it includes A of the above-mentioned sulfur melting kettles, as well as a return water main pipe and a first water collecting tank arranged outside the A sulfur melting kettles; A is a positive integer;

[0021] The output ends of the multiple siphons in each housing are all connected to the input end of the return water main pipe, the output end of the return water main pipe is connected to the first water collecting tank, and the height of the output end of the return water main pipe is lower than the height of the output end of the siphon.

[0022] Further, it further includes a second water collecting tank, and the input end of the second water collecting tank is connected to the output end of the heat preservation steam pipe.

[0023] At the same time, the present invention also provides a steam heating and condensate recovery method, which is special in that the above steam heating and condensate recovery system is used, comprising the following steps:

[0024] Step 1, respectively inputting steam into the input ends of a plurality of heating coils of the above-mentioned sulfur melting kettles A for heating;

[0025] Step 2: Part of the steam from each heating coil is converted into condensed water, which is sucked out through a siphon and a hose and input into a return water pipe, and then recovered by the first water collecting tank;

[0026] The remaining steam of each heating coil is output from the outlet vertical section to the heating steam pipe for subsequent reuse.

[0027] Furthermore, step 2 also includes: part of the steam of the insulation heating coil is converted into condensed water, and the condensed water is output to the second collecting tank through the insulation steam pipe for recovery by controlling the insulation steam drain valve, and the remaining steam of the insulation heating coil is still used to keep the sulfur warm. When the molten sulfur kettle finishes working, the remaining steam of the insulation heating coil is recovered by controlling the insulation steam drain valve.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] (1) In a molten sulfur kettle of the present invention, a siphon and a hose are arranged in the outlet vertical section of each heating coil, and a sealing flange and a steam trap assembly are arranged in sequence along the conveying direction on the siphon. The sealing flange is located between the output end of the outlet vertical section and the siphon, and is used to prevent the output end of the outlet vertical section from overflowing steam and maintain the steam pressure. A steam pipe interface is arranged on the side wall of the outlet vertical section, and the steam pipe interface is used to discharge the steam in the siphon. The steam trap assembly is used to discharge the condensed water in the siphon and maintain the steam pressure. The steam consumption of the embodiment of the present invention is about 55% of the original scheme, and it is expected that the long-term comprehensive steam saving can reach more than 35% of the original steam consumption, and 30,940 tons of steam can be saved annually. The economic value is 5,105,100 yuan.

[0030] (2) The sulfur melting kettle of the present invention has a shorter interval between feeding and discharging than the original solution, which means that the present invention does not affect the production cycle and the sulfur melting capacity will not decrease.

[0031] (3) The molten sulfur kettle of the present invention adopts a siphon tube combined with a hose to improve the water absorption efficiency, which not only completely eliminates the noise of steam exhaust, but also reduces the work task of production workers who need to manually and regularly check whether the coil heating pipeline system is draining normally.

[0032] (4) The preparation method of a sulfur melting kettle of the present invention truncates the output end of each heating coil in the existing sulfur melting kettle, and adds a siphon pipe, a hose and a heating steam pipe to separately process steam and condensate, solving the problems of excessively high steam energy consumption and poor hydrophobicity in the coil heating pipeline system in the sulfur melting kettle, and having a relatively low preparation cost, being suitable for wide promotion.

[0033] (5) A steam heating and condensate recovery system and method of the present invention includes a plurality of sulfur melting kettles, a return water main pipe, and a first water collection tank; each sulfur melting kettle uses a siphon pipe and a hose to absorb the condensate in each heating coil and input it into the return water main pipe, and then it is recovered by the first water collection tank, completely solving the problem of water accumulation and blockage in the heating coil, improving the steam utilization efficiency without affecting the production rhythm, and finally realizing the recovery of steam and reducing water consumption. Description of the Drawings

[0034] Figure 1 is a schematic structural diagram of an existing sulfur melting steam system;

[0035] Figure 2 is Figure 1 a schematic structural diagram of each sulfur melting kettle in

[0036] Figure 1 and Figure 2 The reference numeral descriptions of

[0037] 01 - sulfur melting kettle; 02 - coil heating pipeline system; 03 - main condensate water pipeline; 04 - return water main pipe; 05 - steam - water separator; 06 - steam discharge port; 07 - water collection tank.

[0038] Figure 3 is a schematic structural diagram of an embodiment of a sulfur melting kettle of the present invention;

[0039] Figure 4 is a schematic structural diagram of a siphon pipe in an embodiment of a sulfur melting kettle of the present invention;

[0040] Figure 5 is Figure 1 a dot - line graph of the inlet steam pressure and inlet steam flow rate of the coil heating pipeline system in a sulfur melting kettle in 8 days of the original scheme shown in

[0041] Figure 6 is a dot - line graph of the inlet steam pressure and inlet steam flow rate of the coil heating pipeline system in a sulfur melting kettle in 8 days of an embodiment of a steam heating and condensate recovery system of the present invention;

[0042] Figure 7 is a dot - line graph of the readings of the inlet pressure gauge, the first pressure gauge, and the second pressure gauge of a heating coil in an embodiment of a steam heating and condensate recovery system of the present invention;

[0043] Figure 8 Yes Figure 1 The dotted line comparison diagram of the steam flow consumed by the coil heating pipeline system in a sulfur melting kettle within 8 days between the original solution shown and an embodiment of a steam heating and condensate recovery system of the present invention.

[0044] Figure 3 、 Figure 4 The description of the reference numerals is as follows:

[0045] 1 - Shell; 21 - Inlet vertical section, 22 - Intermediate horizontal section, 23 - Outlet vertical section; 3 - Siphon, 31 - Insertion section, 32 - Outlet section, 33 - Drainage section; 4 - Hose; 5 - Sealing flange; 6 - Heating steam pipe; 7 - First steam trap; 8 - Second steam trap; 9 - Insulation steam pipe; 10 - First pressure gauge; 11 - Second pressure gauge; 12 - Insulation steam trap. Detailed implementation manners

[0046] The present invention will be further described below in conjunction with the drawings and exemplary embodiments.

[0047] Refer to Figure 3 and Figure 4 , a sulfur melting kettle, including a shell 1 and a coil heating pipeline system arranged in the shell 1, and the coil heating pipeline system includes two parallel heating coils.

[0048] Each heating coil is a U-shaped structure with an upward opening, including an inlet vertical section 21, an intermediate horizontal section 22, and an outlet vertical section 23 connected in sequence; a siphon 3 and a hose 4 are inserted into the outlet vertical section 23, and a steam pipe interface is arranged on the side wall of the outlet vertical section 23; the input end of the hose 4 extends into the intermediate horizontal section 22, the output end is connected to the input end of the siphon 3, the input end of the siphon 3 is inserted into the outlet vertical section 23, and the output end of the siphon 3 extends out of the shell 1 for discharging condensate; the steam pipe interface is connected with a heating steam pipe 6, and the output end of the heating steam pipe 6 extends out of the shell 1 for discharging steam.

[0049] A sealing flange 5 and a steam trap assembly are arranged on the siphon 3 in sequence along the conveying direction. The siphon 3 includes an insertion section 31, an outlet section 32, and a drainage section 33 connected in sequence along the conveying direction; the insertion section 31 is located in the outlet vertical section 23, and a sealing flange 5 is arranged between the output end of the insertion section 31 and the output end of the outlet vertical section 23 to make the steam of the heating coil only output from the heating steam pipe 6; the input end of the outlet section 32 is located inside the shell 1, the output end is located outside the shell 1, the height of the outlet section 32 is lower than the height of the output end of the heating steam pipe 6, the height of the output end of the drainage section 33 is lower than the height of the output end of the insertion section 31, and a steam trap assembly is arranged on the drainage section 33.

[0050] The steam trap assembly is used to ensure the stable phase change pressure of steam. The steam trap assembly includes a first pressure gauge 10, a first steam trap 7, a second steam trap 8, and a second pressure gauge 11 arranged in sequence along the conveying direction.

[0051] In other embodiments, the above sulfur melting kettle further includes a heat preservation and tracing coil connected in parallel with the two heating coils.

[0052] The input end of the heat preservation and tracing pipe enters the housing 1 at the input end of the inlet vertical section, and successively follows the inlet vertical section 21, the middle horizontal section 22, and the outlet vertical section 23, and then turns back from the output end of the outlet vertical section 23. Its output end extends out from the bottom of the housing 1 and is connected with a heat preservation steam pipe 9. A heat preservation steam trap 12 is arranged on the heat preservation steam pipe 9 for outputting condensed water.

[0053] Meanwhile, the present invention also provides a preparation method for the sulfur melting kettle, including the following steps:

[0054] Step 1: Select an existing sulfur melting kettle and use its outer shell as the above housing 1;

[0055] Step 2: Cut off each heating coil in the housing 1 obtained in Step 1 at its output end to obtain the above outlet vertical section 23, and set a steam pipe interface on the side wall of the outlet vertical section 23 near the output end of the outlet vertical section 23;

[0056] Step 3: Prepare siphons 3 with a quantity equal to the number of heating coils and a length longer than the length of the outlet vertical section 23, and connect a hose 4 to the input end of the siphon 3;

[0057] Step 4: Insert the siphons 3 and hoses 4 obtained in Step 3 into the heating coils from the output end of the outlet vertical section 23 of each heating coil, and make the input end of the hose 4 extend into the middle horizontal section 22 of each heating coil, and the output end of the siphon 3 extends out of the housing 1; then set a sealing flange 5 between the output end of the outlet vertical section 23 and the siphon 3, connect a heating steam pipe 6 to the steam pipe interface, and make the output end of the heating steam pipe 6 extend out of the housing 1;

[0058] In other embodiments, the preparation method for the above sulfur melting kettle further includes Step 5, specifically as follows:

[0059] Set a heat preservation and tracing coil in the housing 1, make the input end of the heat preservation and tracing coil enter the housing 1 at the input end of the inlet vertical section 21, and successively follow the inlet vertical section 21, the middle horizontal section 22, and the outlet vertical section 23, and then turn back from the output end of the outlet vertical section 23. Then make the output end of the heat preservation and tracing coil extend out from the bottom of the housing 1 and connect it with a heat preservation steam pipe 9. Set a heat preservation steam trap 12 on the heat preservation steam pipe 9 to complete the preparation of the sulfur melting kettle.

[0060] A steam heating and condensate recovery system includes A sulfur melting kettles, as well as a return water main pipe and a first water collection tank arranged outside the A sulfur melting kettles; A is a positive integer. In this embodiment, A is 16.

[0061] In other embodiments, the sulfur melting kettle can also be replaced with a sulfur melting pond.

[0062] The output ends of the two siphons 3 in each housing 1 are all connected to the input end of the return water main pipe, the output end of the return water main pipe is connected to the first water collection tank, and the height of the output end of the return water main pipe is lower than the height of the output end of the insertion section 31; the input end of the second water collection tank is connected to the output end of the heat preservation steam pipe 9.

[0063] In other embodiments, the above-mentioned steam heating and condensate recovery device further includes a second water collection tank, and the input end of the second water collection tank is connected to the output end of the heat preservation steam pipe 9.

[0064] A steam heating and condensate recovery method using the above-mentioned steam heating and condensate recovery system includes the following steps:

[0065] Step 1: Input steam into the input ends of the two heating coils and the heat preservation tracing coil in each of the A sulfur melting kettles respectively, which are used to heat sulfur and keep sulfur warm respectively;

[0066] Step 2: Part of the steam in each heating coil is transformed into condensate water, and the condensate water is sucked out through the siphon 3 and the hose 4 and input into the return water main pipe, and then recovered by the first water collection tank;

[0067] The remaining steam in each heating coil is output from the vertical section 23 of the outlet to the heating steam pipe 6 for subsequent reuse;

[0068] In other embodiments, the above-mentioned steam heating and condensate recovery method further includes the following steps:

[0069] Part of the steam in the heat preservation tracing coil is transformed into condensate water. By controlling the heat preservation steam trap 12, the condensate water is output to the second water collection tank through the heat preservation steam pipe 9 for recovery. The remaining steam in the heat preservation tracing coil is still used to keep sulfur warm. When the sulfur melting kettle finishes working, the remaining steam in the heat preservation tracing coil can be recovered by controlling the heat preservation steam trap 12.

[0070] To prove the effectiveness of the embodiments of the present invention, Figure 1 The steam system of the housing 1 shown is used as the original scheme for comparison, specifically as follows:

[0071] Preparation before the test: Only turn on the coil heating pipeline system 02 of one sulfur melting kettle 01 in the sulfur melting steam system of the original scheme and the coil heating pipeline system of one housing 1 in the steam heating and condensate recovery system of the embodiment of the present invention for a comparative test;

[0072] Figure 5 It is a dot-line graph of the inlet steam pressure and inlet steam flow rate of the coil heating pipeline system 02 in the original plan within 8 days (from May 25th to June 1st). It can be found from the graph that the inlet steam pressure and inlet steam flow rate are basically in a direct proportion relationship. After detection, the outlet temperature of the coil heating pipeline system 02 is on average 10 - 20 °C lower than the inlet temperature. Considering the characteristics of steam phase change heating, this indicates that the open discharge at the outlet of the coil heating pipeline system 02 in the original plan leads to pressure loss in the steam system, affecting the phase change pressure and phase change temperature of the steam.

[0073] Figure 6 It is a dot-line graph of the inlet steam pressure and inlet steam flow rate of the coil heating pipeline system in the embodiment of the present invention within 8 days (from June 9th to June 16th). The changing trends of the two curves shown on the graph are also basically the same.

[0074] The inlet steam pressure and inlet steam flow rate of the above-mentioned coil heating pipeline system are both measured by a flow meter at the inlet of the corresponding coil heating pipeline system. The outlet temperature of the above-mentioned coil heating pipeline system is measured by a thermometer at the outlet of the corresponding coil heating pipeline system.

[0075] Figure 7 It is a dot-line graph of the readings of the inlet pressure gauge, the first pressure gauge 10, and the second pressure gauge 11 of one of the heating coils in the embodiment of the present invention. It can be found that except for local areas, the pressure is basically the same. The installation of the first steam trap 7 and the second steam trap 8 can ensure the stability of the phase change pressure of the steam heating and condensate recovery system.

[0076] Figure 8 It is a dot-line graph of the steam flow rate consumed by the coil heating pipeline system in the original plan and the embodiment of the present invention within 8 days. It can be found from the graph that within 8 days, the steam flow rate consumed by the coil heating pipeline system 02 in the original plan is significantly more than that of the embodiment of the present invention. The embodiment of the present invention has a remarkable steam energy-saving effect.

[0077] Steam flow rate consumed by the coil heating pipeline system

[0078] To more clearly understand the energy-saving effectiveness of the embodiment of the present invention, Table 1 shows the comparison of the average inlet steam pressure, average steam consumption flow rate, and the time interval between each feeding and discharging of the molten sulfur steam system in the original plan and the embodiment of the present invention.

[0079] Table 1

[0080]

[0081] It can be found from the data given by the statistics that the average inlet pressure of the original scheme is slightly lower, but the average steam consumption flow rate is relatively large. The average steam consumption flow rate of the embodiment of the present invention is about 55% of that of the original scheme, and it is expected that the long-term comprehensive steam saving amount can reach more than 35% of the original steam consumption. From the perspective of the interval time between feeding and discharging, the embodiment of the present invention is shorter, and this value indicates that the sulfur melting production capacity of the shell 1 of the embodiment of the present invention will not decrease.

Claims

1. A sulfur melting kettle, comprising a housing (1) and a coil heating pipe system arranged inside the housing (1). The coil heating pipe system includes a plurality of heating coils connected in parallel; each of the heating coils is in an upward-opening U-shaped structure, and includes an inlet vertical section (21), an intermediate horizontal section (22), and an outlet vertical section (23) connected in sequence; It is characterized in that: A siphon (3) and a hose (4) are inserted into the outlet vertical section (23). A steam pipe interface is arranged on the side wall of the outlet vertical section (23); the input end of the hose (4) extends into the intermediate horizontal section (22), the output end is connected to the input end of the siphon (3), the input end of the siphon (3) is inserted into the outlet vertical section (23), and the output end of the siphon (3) extends out of the housing (1) for outputting condensed water; the steam pipe interface is connected to a heating steam pipe (6), and the output end of the heating steam pipe (6) extends out of the housing (1) for outputting steam; A sealing flange (5) and a steam trap assembly are arranged in sequence along the conveying direction on the siphon (3). The sealing flange (5) is located inside the housing (1) and is arranged between the output end of the outlet vertical section (23) and the siphon (3). The steam trap assembly is located outside the housing (1) to ensure the stability of the steam phase change pressure.

2. A sulfur melting kettle according to claim 1, It is characterized in that: The siphon (3) includes an insertion section (31), an outlet section (32), and a drainage section (33) connected in sequence along the conveying direction; the insertion section (31) is located inside the outlet vertical section (23), and the output end of the insertion section (31) is provided with the sealing flange (5); the input end of the outlet section (32) is located inside the housing (1), the output end is located outside the housing (1), the height of the outlet section (32) is lower than the height of the output end of the heating steam pipe (6), and the height of the output end of the drainage section (33) is lower than the height of the output end of the insertion section (31). A steam trap assembly is arranged on the drainage section (33).

3. A sulfur melting kettle according to claim 2, It is characterized in that: The steam trap assembly includes a first pressure gauge (10), a first steam trap (7), a second steam trap (8), and a second pressure gauge (11) arranged in sequence along the conveying direction.

4. A sulfur melting kettle according to any one of claims 1 to 3, It is characterized in that: The coil heating pipe system further includes at least one heat preservation and tracing coil connected in parallel with the plurality of heating coils. The input end of the heat preservation and tracing coil enters the housing (1) at the input end of the inlet vertical section (21), and sequentially follows the inlet vertical section (21), the intermediate horizontal section (22), and the outlet vertical section (23), and then turns back from the output end of the outlet vertical section (23). Its output end extends out from the bottom of the housing (1) and is connected to a heat preservation steam pipe (9). A heat preservation steam trap (12) is arranged on the heat preservation steam pipe (9) for outputting condensed water.

5. A preparation method of a sulfur melting kettle, It is characterized in that, It includes the following steps: Step 1: Select an existing sulfur melting kettle and use its outer shell as the housing (1) described in claim 1; Step 2: Cut each heating coil in the housing (1) obtained in Step 1 at its output end to obtain the outlet vertical section (23) described in Claim 1, and provide a steam pipe interface at the side wall of the outlet vertical section (23) near the output end of the outlet vertical section (23). Step 3: Prepare siphons (3) with a quantity equal to the number of heating coils and a length longer than the length of the outlet vertical section (23), and connect a hose (4) to the input end of the siphon (3). Step 4: Insert the siphons (3) and hoses (4) obtained in Step 3 into the heating coils from the output ends of the outlet vertical sections (23) of each heating coil, and make the input end of the hose (4) extend into the middle horizontal section (22) of each heating coil, with the output end of the siphon (3) extending out of the housing (1); then provide a sealing flange (5) between the output end of the outlet vertical section (23) and the siphon (3), connect a heating steam pipe (6) to the steam pipe interface, and make the output end of the heating steam pipe (6) extend out of the housing (1) to complete the preparation of the sulfur melting kettle.

6. A steam heating and condensate recovery system, characterized in that: it includes A sulfur melting kettles described in Claim 1, as well as a return water main pipe and a first water collection tank arranged outside the A sulfur melting kettles; A is a positive integer; the output ends of the multiple siphons (3) in each housing (1) are all connected to the input end of the return water main pipe, the output end of the return water main pipe is connected to the first water collection tank, and the height of the output end of the return water main pipe is lower than the height of the output end of the siphon (3).

7. A steam heating and condensate recovery system according to Claim 6, characterized in that: it further includes a second water collection tank, and the input end of the second water collection tank is connected to the output end of the heat preservation steam pipe (9).

8. A steam heating and condensate recovery method, characterized in that, it adopts a steam heating and condensate recovery system described in Claim 6, and includes the following steps: Step 1: Input steam into the input ends of the multiple heating coils of A above-mentioned sulfur melting kettles respectively for heating; Step 2: Part of the steam in each heating coil is transformed into condensate, and the condensate is sucked out through the siphon (3) and the hose (4) and input into the return water main pipe, and then recovered by the first water collection tank; The remaining steam in each heating coil is output from the outlet vertical section (23) to the heating steam pipe (6) for subsequent reuse.

9. A steam heating and condensate recovery method according to Claim 8, characterized in that, Step 2 further includes: Part of the steam in the heat preservation tracing coil is transformed into condensate, and by controlling the heat preservation steam trap (12), the condensate is output through the heat preservation steam pipe (9) to the second water collection tank for recovery, and the remaining steam in the heat preservation tracing coil is still used for sulfur heat preservation. After the sulfur melting kettle finishes working, by controlling the heat preservation steam trap (12), the remaining steam in the heat preservation tracing coil is recovered.

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