Energy-saving sulfur melting device and method
By using double helix plate heat exchanger and local heating technology in the sulfur melting device, the high-temperature heating and steam waste caused by the traditional sulfur melting device are solved, and efficient separation and energy-saving effects of sulfur and clean liquid are achieved.
Patent Information
- Application Number
- CN202510139886.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-08
- Publication Date
- 2025-05-30
AI Technical Summary
The structure of traditional sulfur melters is unreasonable, which causes the sulfur foam to reach high temperature during the heating process, resulting in large steam consumption and local boiling of the liquid, affecting the quality of the clean liquid and the efficiency of the desulfurization liquid.
An energy-saving sulfur melting device is designed, including a heat exchange section, a static section, a heating section and a sulfur release section. A double-spiral plate heat exchanger is used to perform sectional heat exchange between sulfur foam and the clear liquid, and only locally heats the sulfur foam entering the sulfur melter to achieve separation of sulfur and the clear liquid.
The separation of sulfur and detergent is achieved at a lower temperature, saving steam consumption, eliminating local boiling of the liquid, and improving the quality of the outlet clear liquid and the efficiency of the desulfurization liquid.
Smart Images
Figure CN120054332A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of gas desulfurization and purification, and particularly to an energy-saving sulfur melting device and method. Background Art
[0002] During the gas purification process, a large amount of sulfur foam is generated in the regeneration tower during HPF method desulfurization, and the sulfur foam is sent to a sulfur melter for sulfur melting operation. In the sulfur melter, the foam is heated for solid-liquid separation. The solid is elemental sulfur, which is discharged from the sulfur melter and collected for external commissioning and disposal, and the liquid (i.e., clear liquid) is returned to the desulfurization system for recycling. When the temperature reaches 85°C, the sulfur foam can achieve the separation of sulfur and clear liquid. However, in actual use, due to the unreasonable structure of the traditional sulfur melter, the sulfur foam needs to be heated to 125°C in the sulfur melting section to achieve the separation of sulfur and clear liquid in the sulfur melter. The extra 40°C temperature difference is the main reason for the large steam consumption. The traditional sulfur melter heats all the sulfur foam entering the sulfur melter with steam, resulting in the temperature of the clear liquid returned to the tower can only be controlled at about 95°C, wasting steam and affecting the efficiency of the desulfurization liquid. Especially in summer, it seriously affects the normal operation of the desulfurization tower. The operating temperature controlled by the traditional sulfur melter is relatively high, which will cause local boiling of the internal liquid, resulting in more sulfur slag entrained in the outlet clear liquid. Summary of the Invention
[0003] The technical problem to be solved by the present invention is to provide an energy-saving sulfur melting device, which saves steam consumption, eliminates the phenomenon of local boiling of the internal liquid of the sulfur melting device, improves the quality of the outlet clear liquid, and enhances the effect of the desulfurization liquid.
[0004] To achieve the above object, the present invention adopts the following technical solutions:
[0005] An energy-saving sulfur melting device includes a heat exchange section, a static section, a heating section, and a sulfur discharging section connected in sequence. A clear liquid outlet is provided at the top of the heat exchange section, and a sulfur discharging port is provided at the bottom of the sulfur discharging section;
[0006] A heat exchanger I is provided in the heat exchange section. The heat exchanger I is a spiral plate heat exchanger. A closed sulfur foam channel I is provided inside the heat exchanger I, and the other flow channels of the heat exchanger I are open at both the top and the bottom;
[0007] A heat exchanger II is provided at the upper part of the static section. The heat exchanger II is a spiral plate heat exchanger. A sulfur foam channel II is provided inside the heat exchanger II. The inlet of the sulfur foam channel II is connected to the outlet of the sulfur foam channel I. The outlet of the sulfur foam channel II is annularly arranged at the bottom of the outermost flow channel of the heat exchanger II. The other flow channels of the heat exchanger II are open at both the top and the bottom. A cylindrical anti-mixing quality partition is connected to the bottom of the outlet of the sulfur foam channel II. A gap provided between the outlet of the sulfur foam channel II and the anti-mixing quality partition and the shell of the static section is communicated;
[0008] A heater is provided inside the heating section. A steam channel is provided inside the heater, and the inside of the heater is connected vertically.
[0009] A heat-insulating jacket is provided inside the sulfur discharging section, and steam is introduced between the heat-insulating jacket and the shell of the sulfur discharging section.
[0010] The feed port of the first sulfur foam channel is arranged on the heat exchange section shell at the bottom of the first heat exchanger. The outlet of the first sulfur foam channel is arranged at the center of the top of the first heat exchanger. The inlet of the second sulfur foam channel is arranged at the center of the top of the second heat exchanger. The outlet of the first sulfur foam channel is connected to the inlet of the second sulfur foam channel through an external pipeline outside the shell.
[0011] A heater steam inlet is provided at the top on one side of the heating section shell, and a heater steam outlet is provided at the bottom on the other side.
[0012] One side of the shell of the sulfur discharging section is connected to the heat-insulating jacket steam inlet, the other side is connected to the heat-insulating jacket steam outlet, and the bottom of the heat-insulating jacket is connected to the sulfur discharging port.
[0013] A production method of an energy-saving sulfur melting device. Sulfur foam enters from the feed port of the first sulfur foam channel, flows through the closed sulfur foam flow channel one of the first heat exchanger, rotates and flows from the outside to the center in the first heat exchanger, enters the second heat exchanger through an external pipeline, rotates and flows from the center to the outside in the second heat exchanger, and finally flows out from the bottom of the outermost ring flow channel of the second heat exchanger, and flows into the bottom of the static section along the gap between the static section shell and the anti-mixing quality partition board. The temperature at the bottom of the static section is controlled at 70-90°C. The sulfur foam is separated into elemental sulfur and clear liquid. The elemental sulfur continues to sink under the action of gravity, is heated by steam through the open flow channel of the heater and then becomes molten sulfur and enters the sulfur discharging section. The sulfur accumulates continuously in the sulfur discharging section. The sulfur in the heat-insulating jacket is in a molten state. Sulfur is discharged regularly through the sulfur discharging port every half an hour. The sulfur in the sulfur foam is finally discharged. The clear liquid exchanges heat with the sulfur foam through the open flow channels of the second heat exchanger and the first heat exchanger upward in turn through the inner cavity of the anti-mixing quality partition board, and finally flows out from the clear liquid outlet and returns to the desulfurization tower system.
[0014] Compared with the existing technology, the beneficial effects of the present invention are:
[0015] 1. The present invention can only locally heat the sulfur foam entering the sulfur melting device, and realize the separation of sulfur and clear liquid when the sulfur melting device is heated to above 70°C. The sulfur foam exchanges heat with the clear liquid in sections inside the sulfur melting device, and realizes the goal of reducing the temperature of the clear liquid returning to the desulfurization tower at the outlet of the sulfur melting device to 65°C. It saves steam consumption, eliminates the phenomenon of local boiling of the liquid inside the sulfur melting device, improves the quality of the outlet clear liquid, and enhances the desulfurization liquid effect.
[0016] 2. Two heat exchangers form a double helix and are used in series. The sulfur foam entering the heat exchanger 1 has a low entry and a high exit direction, which ensures that the heat exchange area of the spiral is fully utilized, improves the heat exchange effect between the clear liquid and the foam, and makes the waste heat of the clear liquid fully absorbed by the sulfur foam. While saving energy, it also reduces the clear liquid temperature at the outlet of the sulfur melting device.
[0017] 3. After sufficient heat exchange with the sulfur foam in heat exchanger 1 and heat exchanger 2, the temperature of the clear liquid at the outlet of the sulfur melting device can be reduced to below 65°C. After the sulfur foam absorbs the heat of the clear liquid, the initial temperature entering the static section can be increased, reducing the steam consumption in the heating section.
[0018] 4. Under the action of the anti-mixing baffle, the sulfur foam is fully separated in the static section to prevent the clear liquid after separation from mixing with the foam just entering the static section, which will affect the separation effect.
[0019] 5. The temperature of the sulfur melting device gradually decreases from bottom to top, and the temperature at the bottom of the static section is controlled to reach 70-90℃. Under this condition, the sulfur foam begins to separate into sulfur element and clear liquid in the static section. The elemental sulfur continues to sink into the sulfur discharge section under the action of gravity and is finally discharged. The clear liquid goes up through the clear liquid outlet and returns to the desulfurization system. In this process, the external steam heat source of the device only heats the elemental sulfur through the heating section, and the clear liquid is not heated excessively, so there is no energy waste.
[0020] 6. Steam enters the heater from the external flow channel and is discharged from the central flow channel of the lower end surface. Condensed water generated in the heating section can be discharged from the heating section in time to ensure that there is no water accumulation in the heating section and improve the heating effect.
[0021] 7. The elemental sulfur and the clear liquid are separated before the foam reaches the heater. The clear liquid flows upward without being directly heated by the heater. The steam only heats the elemental sulfur, which reduces the steam consumption and also reduces the initial temperature of the clear liquid. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] Figure 1 It is a structural schematic diagram of the present invention. DETAILED DESCRIPTION
[0023] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is more than two.
[0024] Unless otherwise clearly specified and defined, the terms "install", "connect", and "couple" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood through specific circumstances.
[0025] Such as Figure 1 , an energy-saving sulfur melting device, which includes a heat exchange section 1, a static section 2, a heating section 3, and a sulfur discharging section 4 connected in sequence. A clear liquid outlet 5 is provided at the top of the heat exchange section 1, and a sulfur discharging port 6 is provided at the bottom of the sulfur discharging section 4;
[0026] A heat exchanger one 11 is provided inside the heat exchange section 1. The heat exchanger one 11 is a spiral plate heat exchanger. A closed sulfur foam channel one is provided inside the heat exchanger one 11, and the other flow channels of the heat exchanger one are open at both the upper and lower parts;
[0027] A heat exchanger two 21 is provided at the upper part of the static section 2. The heat exchanger two 21 is a spiral plate heat exchanger. A sulfur foam channel two is provided inside the heat exchanger two 21. The inlet 22 of the sulfur foam channel two is connected to the outlet 12 of the sulfur foam channel one through an external connecting pipe 7 outside the shell. The outlet 23 of the sulfur foam channel two is looped at the bottom of the outermost flow channel of the heat exchanger two 21. The other flow channels of the heat exchanger two 21 are open at both the upper and lower parts. The bottom of the outlet 23 of the sulfur foam channel two is connected to a cylindrical anti-mixing quality partition 24. The outlet 23 of the sulfur foam channel two communicates with the gap between the anti-mixing quality partition 24 and the shell of the static section 2 to form a sulfur foam discharging flow channel.
[0028] A heater 31 is provided inside the heating section 3. A steam channel is provided inside the heater 31, and the inside of the heater 31 is in upper and lower communication;
[0029] A heat preservation jacket 41 is provided inside the sulfur discharging section 4, and steam is introduced between the heat preservation jacket 41 and the shell of the sulfur discharging section 4.
[0030] The feed inlet 13 of the first sulfur foam channel is arranged on the shell of the heat exchange section 1 at the bottom of the first heat exchanger 11, the outlet 12 of the first sulfur foam channel is arranged at the center of the top of the first heat exchanger 11, and the inlet 22 of the second sulfur foam channel is arranged at the center of the top of the second heat exchanger 21.
[0031] At the top of one side of the shell of the heating section 3, a heater steam inlet 32 is provided, and at the bottom of the other side, a heater steam outlet 33 is provided.
[0032] One side of the shell of the sulfur discharging section 4 is connected to the heat preservation jacket steam inlet 42, the other side is connected to the heat preservation jacket steam outlet 43, and the bottom of the heat preservation jacket 41 is connected to the sulfur discharging port 6.
[0033] A production method of an energy-saving sulfur melting device. Sulfur foam enters from the feed inlet 13 of the first sulfur foam channel, flows through the closed sulfur foam flow channel 1 of the first heat exchanger 11, rotates and flows from the outside to the center in the first heat exchanger 11, enters the second heat exchanger 21 through the external pipeline 7, rotates and flows from the center to the outside in the second heat exchanger 21, and finally flows out from the bottom of the outermost ring flow channel of the second heat exchanger 21, and flows into the bottom of the static section 2 along the gap between the shell of the static section 2 and the anti-mixing quality partition plate 24. The temperature at the bottom of the static section 2 is controlled at 70 - 90 °C. The sulfur foam is separated into elemental sulfur and clear liquid. The elemental sulfur continues to sink under the action of gravity, is heated by steam through the open flow channel of the heater 31 and then becomes molten sulfur and enters the sulfur discharging section 4. Sulfur accumulates continuously in the sulfur discharging section 4. The sulfur in the heat preservation jacket 41 is in a molten state. Sulfur is discharged regularly through the sulfur discharging port 6 every half an hour. The sulfur in the sulfur foam is finally discharged. The clear liquid sequentially passes through the open flow channels of the second heat exchanger 21 and the first heat exchanger 11 to exchange heat with the sulfur foam through the inner cavity of the anti-mixing quality partition plate 24, and finally flows out from the clear liquid outlet 5 and returns to the desulfurization tower system.
[0034] The pressure inside the sulfur melting device is controlled below 0.28 MPa. Excessive pressure will reduce the service life of the first heat exchanger 11 and the second heat exchanger 21. The temperature at the bottom of the static section 2 is maintained at 70 - 90 °C. Excessive temperature will cause local boiling of the internal liquid, the clear liquid outlet 5 will entrain sulfur slag, and the temperature of the clear liquid outlet 5 is high and energy is wasted. When the temperature of the thermometer 8 is higher than 90 °C or lower than 70 °C, the steam volume of the heater 31 is adjusted. Sulfur should be discharged regularly through the sulfur discharging port 6. If sulfur is not discharged for a long time, the pressure inside the device will increase and the clear liquid will entrain sulfur slag.
[0035] The preferred embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solutions of the present invention, and these simple modifications all fall within the protection scope of the present invention. Additionally, it should be noted that among the various specific technical features described in the above specific embodiments, they can be combined in any appropriate manner without contradiction. To avoid unnecessary repetition, the present invention will not separately describe various possible combination methods. Furthermore, any combination can be made between different embodiments of the present invention, as long as it does not violate the idea of the present invention, it should also be regarded as the content disclosed by the present invention.
[0036] To make the objectives, technical solutions, and technical effects of the present invention clearer, the technical solutions in the embodiments of the present invention will now be described clearly and completely. However, the embodiments described below are only a part of the embodiments of the present invention, rather than all of the embodiments. Combining the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the protection scope of the present invention.
[0037] Embodiment:
[0038] An energy-saving sulfur melting device includes a heat exchange section 1, a static section 2, a heating section 3, and a sulfur discharging section 4 connected in sequence. A clear liquid outlet 5 is provided at the top of the heat exchange section 1, and a sulfur discharging port 6 is provided at the bottom of the sulfur discharging section 4;
[0039] A heat exchanger one 11 is provided in the heat exchange section 1. The heat exchanger one 11 is a spiral plate heat exchanger. A closed sulfur foam channel one is provided in the heat exchanger one 11, and the other flow channels of the heat exchanger one are open at both the top and the bottom; The feed port 13 of the sulfur foam channel one is provided on the shell of the heat exchange section 1 at the bottom of the heat exchanger one 11, the outlet 12 of the sulfur foam channel one is provided at the center of the top of the heat exchanger one 11, and the inlet 22 of the sulfur foam channel two is provided at the center of the top of the heat exchanger two 21.
[0040] A heat exchanger two 21 is provided in the upper part of the static section 2. The heat exchanger two 21 is a spiral plate heat exchanger. A sulfur foam channel two is provided in the heat exchanger two 21. The inlet 22 of the sulfur foam channel two is connected to the outlet 12 of the sulfur foam channel one through an external connecting pipe 7 outside the shell. The outlet 23 of the sulfur foam channel two is looped at the bottom of the outermost flow channel of the heat exchanger two 21. The other flow channels of the heat exchanger two 21 are open at both the top and the bottom. The bottom of the outlet 23 of the sulfur foam channel two is connected to a cylindrical anti-mixing quality partition 24. The length of the anti-mixing quality partition 24 ≥ 300 mm. The outlet 23 of the sulfur foam channel two is communicated with the gap between the anti-mixing quality partition 24 and the shell of the static section 2 to form a sulfur foam discharging flow channel.
[0041] The distance between the heat exchanger one 11 and the heat exchanger two 21 ≥ 200 mm.
[0042] A heater 31 is provided in the heating section 3. The heater 31 is a spiral plate heat exchanger. One flow channel inside the heater 31 is a steam channel, and the other flow channel inside the heater 31 is connected vertically. Steam enters from the outside to the top of the outer cavity of the heater 31 and flows out from the bottom of the middle cavity. A heater steam inlet 32 is provided at the top of one side of the housing of the heating section 3, and a heater steam outlet 33 is provided at the bottom of the other side.
[0043] A heat preservation jacket 41 is provided in the sulfur discharging section 4, and steam is introduced between the heat preservation jacket 41 and the housing of the sulfur discharging section 4. One side top of the housing of the sulfur discharging section 4 is connected to a heat preservation jacket steam inlet 42, the other side bottom is connected to a heat preservation jacket steam outlet 43, and the bottom of the heat preservation jacket 41 is connected to a sulfur discharging port 6.
[0044] The pressure inside the sulfur melting device is 0.25 MPa. When the thermometer 8 detects that the temperature is higher than 90 °C, the steam volume of the heater 31 is reduced. When the thermometer 8 detects that the temperature is lower than 70 °C, the steam volume of the heater 31 is increased. Sulfur is discharged regularly through the sulfur discharging port 6 every half an hour.
[0045] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and basic spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. An energy-saving sulfur melting device, characterized in that: It includes a heat exchange section, a static section, a heating section, and a sulfur discharge section connected in sequence, a clear liquid outlet is provided at the top of the heat exchange section, and a sulfur discharge port is provided at the bottom of the sulfur discharge section; The heat exchange section is provided with a heat exchanger 1, which is a spiral plate heat exchanger. A closed sulfur foam channel 1 is provided in the heat exchanger 1, and other flow channels of the heat exchanger 1 are open at the top and bottom. The upper part of the static section is provided with a second heat exchanger, the second heat exchanger is a spiral plate heat exchanger, a second sulfur foam channel is provided in the second heat exchanger, the inlet of the second sulfur foam channel is connected to the outlet of the first sulfur foam channel, the outlet ring of the second sulfur foam channel is arranged at the bottom of the outermost flow channel of the second heat exchanger, the other flow channels of the second heat exchanger are open at the top and bottom, the bottom of the outlet of the second sulfur foam channel is connected to a cylindrical anti-mixing baffle, and the outlet of the second sulfur foam channel is connected to a gap arranged between the anti-mixing baffle and the shell of the static section; The heating section is provided with a heater, the heater is provided with a steam channel, and the interior of the heater is connected from top to bottom; A heat-insulating jacket is arranged in the desulfurizing section, and steam is passed between the heat-insulating jacket and the shell of the desulfurizing section.
2. The energy-saving sulfur melting device according to claim 1 is characterized in that: The feed port of the sulfur foam channel one is arranged on the heat exchange section shell at the bottom of the heat exchanger one, the outlet of the sulfur foam channel one is arranged at the top center of the heat exchanger one, the inlet of the sulfur foam channel two is arranged at the top center of the heat exchanger two, and the outlet of the sulfur foam channel one is connected to the inlet of the sulfur foam channel two through an external pipe outside the shell.
3. The energy-saving sulfur melting device according to claim 1 is characterized in that: A heater steam inlet is arranged at the top of one side of the heating section shell, and a heater steam outlet is arranged at the bottom of the other side.
4. The energy-saving sulfur melting device according to claim 1 is characterized in that: One side of the desulfurization section shell is connected to the steam inlet of the insulation jacket, the other side is connected to the steam outlet of the insulation jacket, and the bottom of the insulation jacket is connected to the desulfurization port.
5. A production method of an energy-saving sulfur melting device according to claim 1, characterized in that: The sulfur foam enters from the feed port of the sulfur foam channel 1, flows through the closed sulfur foam flow channel 1 of the heat exchanger 1, rotates from the outside to the center in the heat exchanger 1, enters the heat exchanger 2 through the external pipe, rotates from the center to the outside in the heat exchanger 2, and finally flows out at the bottom of the outermost flow channel of the heat exchanger 2, flows into the bottom of the static section along the gap between the static section shell and the anti-mixing baffle, and the temperature at the bottom of the static section is controlled at 70-90°C. The sulfur foam is separated into elemental sulfur and clear liquid. The elemental sulfur continues to sink under the action of gravity, and is heated by steam through the open flow channel of the heater to become molten sulfur and enter the sulfur discharge section. Sulfur is continuously accumulated in the sulfur discharge section, and the sulfur in the insulation jacket is in a molten state. Sulfur is discharged regularly through the sulfur discharge port every half an hour, and the sulfur in the sulfur foam is finally discharged. The clear liquid passes through the inner cavity of the anti-mixing baffle upward and successively passes through the open flow channels of the heat exchanger 2 and the heat exchanger 1 to exchange heat with the sulfur foam, and finally flows out from the clear liquid outlet and returns to the desulfurization tower system.