High-temperature flue gas waste heat utilization system of sulfur burning furnace

Abstract

The utility model discloses a high-temperature flue gas waste heat utilization system of a sulfur burning furnace. The high-temperature flue gas waste heat utilization system of the sulfur burning furnace comprises a control device, a sulfur burning furnace, a first communication pipeline, a second communication pipeline, a waste heat utilization pipeline and a flue gas conveying pipeline, a second valve is arranged on the flue gas conveying pipeline; the flue gas conveying pipeline is communicated with a second chimney, and a third valve is arranged on the second chimney; the first communicating pipeline is communicated with a first chimney, and a first valve is arranged on the first chimney; the joint of the first communication pipeline and the second communication pipeline is connected through a first thermal expansion annular sealing device, and the joint of the waste heat utilization pipeline and the smoke conveying pipeline is connected through a second thermal expansion annular sealing device. The high-temperature flue gas waste heat utilization system of the sulfur burning furnace can fully utilize high-temperature flue gas waste heat and prevent sulfur dioxide gas from overflowing, and is safe to use.

Description

Technical Field

[0001] The utility model relates to the technical field of the chemical industry, and particularly relates to a waste heat utilization system for high-temperature flue gas of a sulfur-burning furnace. Background Art

[0002] In the process of producing ammonium sulfite, sulfur-containing substances are often burned in a sulfur-burning furnace to generate high-temperature sulfur dioxide flue gas, and the temperature of the sulfur dioxide flue gas is as high as over 800°C. The reaction of sulfur dioxide and ammonia water to produce ammonium sulfite is an exothermic reaction. Therefore, it is necessary to reduce the temperature of the sulfur dioxide flue gas. Therefore, the heat of the high-temperature sulfur dioxide flue gas can be utilized. There is a certain amount of moisture in the high-temperature sulfur dioxide flue gas, and during the cooling process, sulfur dioxide will react with water to form sulfurous acid solution. At present, the conventional cooling device for high-temperature sulfur dioxide flue gas has the defect that the acid solution cannot be removed cleanly, which affects the quality of the produced ammonium sulfite. The heating-up time for the high-temperature sulfur dioxide flue gas from combustion to reaching the temperature peak is very short, or when the sulfur-containing substances stop burning in the sulfur-burning furnace, the cooling time is also very short, resulting in cracks easily appearing between the sulfur-burning furnace of the high-temperature sulfur dioxide flue gas and the waste heat utilization device, and the risk of high-temperature sulfur dioxide gas overflowing is very high, making it difficult to utilize the waste heat of the high-temperature flue gas of the sulfur-burning furnace. Summary of the Invention

[0003] The purpose of the utility model is to provide a waste heat utilization system for high-temperature flue gas of a sulfur-burning furnace, which can make full use of the waste heat of the high-temperature flue gas and prevent the overflow of sulfur dioxide gas, aiming at the deficiencies of the prior art.

[0004] A waste heat utilization system for high-temperature flue gas of a sulfur-burning furnace is characterized in that it comprises a control device, a sulfur-burning furnace, a first connecting pipeline, a second connecting pipeline, a waste heat utilization pipeline, and a flue gas conveying pipeline that are connected in sequence; a second valve is provided on the flue gas conveying pipeline; the flue gas conveying pipeline is connected to a second chimney, and a third valve is provided on the second chimney; the second chimney is located on the side close to the waste heat utilization pipeline of the second valve; the first connecting pipeline is connected to a first chimney, and a first valve is provided on the first chimney; the connection between the first connecting pipeline and the second connecting pipeline is connected through a first thermal expansion ring-shaped sealing device, and the connection between the waste heat utilization pipeline and the flue gas conveying pipeline is connected through a second thermal expansion ring-shaped sealing device.

[0005] Above the waste heat utilization pipeline, there is a waste heat steam generation device with a cavity; the waste heat steam generation device is connected to the waste heat utilization pipeline through a number of heat conduction fins; the waste heat steam generation device is provided with a water inlet communicating with its cavity, and the water inlet is connected to a water inlet pipe; a water inlet valve is provided on the water inlet pipe; the waste heat steam generation device is provided with a sewage outlet communicating with the bottom of its cavity; the sewage outlet is connected to a first sewage pipeline, and a first sewage valve is provided on the first sewage pipeline; the waste heat steam generation device is provided with a number of steam outlet valves, a number of safety valves, and a pressure measuring device communicating with its cavity; a water level measuring device is provided on the waste heat steam boiler, and the water level measuring device is connected to a salt content optical measuring device; a liquid accumulation tank is provided at the bottom end of the flue gas conveying pipeline, a liquid level gauge is provided on the liquid accumulation tank, and the liquid accumulation tank is connected to a second sewage pipeline; a second sewage valve is provided on the second sewage pipeline; the water level measuring device, the salt content optical measuring device, the pressure measuring device, the safety valve, the water inlet valve, the first sewage valve, the safety valve, the steam outlet valve, the second sewage valve, and the liquid level gauge are all connected to the control device.

[0006] The beneficial effects of the present utility model are as follows: A first communication pipeline and a second communication pipeline are provided between the sulfur burning furnace and the waste heat utilization pipeline, and a second valve is provided on the flue gas conveying pipeline; the flue gas conveying pipeline is connected to a second chimney and a third valve is provided on the second chimney; the second chimney is located on the side close to the waste heat utilization pipeline of the second valve; the first communication pipeline is connected to a first chimney and a first valve is provided on the first chimney; the connection of the first communication pipeline and the second communication pipeline is connected through a first thermal expansion ring seal device, and the connection of the waste heat utilization pipeline and the flue gas conveying pipeline is connected through a second thermal expansion ring seal device. In this way, before burning sulfur-containing substances, by burning dyes, the first thermal expansion ring seal device and the second thermal expansion ring seal device can be gradually heated up to achieve sealing, solving the problem of the risk of high-temperature sulfur dioxide gas overflow due to possible cracks between the existing waste heat utilization device and the sulfur burning furnace. When the waste heat steam generation device generates steam, when the salt content optical measuring device measures that the salt content of the water in the waste heat steam generation device exceeds the standard, the first sewage valve opens; when the liquid level in the liquid accumulation tank exceeds the set value, the second sewage valve opens; when the water level measuring device measures that the water level in the waste heat steam generation device is lower than the set value, the water inlet valve opens; when the pressure measuring device measures that the pressure in the waste heat steam generation device exceeds the set value, each safety valve opens, and the waste heat steam generation device is safe to use, can discharge acid liquid, and improve the purity of sulfur dioxide gas.

[0007] As a preferred technical solution, the first communication pipeline and the second communication pipeline are coaxially arranged. The first communication pipeline sequentially includes a first lining layer, a first heat insulation block layer, a first refractory brick layer, and a first refractory soil layer from the inside to the outside; the second communication pipeline sequentially includes a second lining layer, a second heat insulation block layer, a second refractory brick layer, and a second refractory soil layer from the inside to the outside.

[0008] Adopting this technical solution can keep warm and improve the efficiency of the waste heat steam generation device at the same time.

[0009] As a preferred technical solution, both the first lining layer and the second lining layer are asbestos lining layers.

[0010] As a preferred technical solution, the first thermal expansion ring-shaped sealing device includes a first thermal expansion sealing layer and a first expansion joint;

[0011] The first thermal expansion sealing layer is located in the gap between the first connecting pipe and the second connecting pipe, and a ring-shaped first expansion joint is sleeved on the radial outer peripheral surface of the gap between the first connecting pipe and the second connecting pipe.

[0012] As a preferred technical solution, the first thermal expansion sealing layer is a first aluminum silicate fiber thermal expansion sealing layer.

[0013] As a preferred technical solution, the second thermal expansion ring-shaped sealing device includes a second expansion joint; the second expansion joint is sleeved on the radial outer peripheral surface of the connection gap between the waste heat utilization pipe and the flue gas conveying pipe.

[0014] As a preferred technical solution, the second thermal expansion ring-shaped sealing device includes a second thermal expansion sealing layer, and the second thermal expansion sealing layer is on the connection gap between the waste heat utilization pipe and the flue gas conveying pipe.

[0015] As a preferred technical solution, the second thermal expansion sealing layer is a second aluminum silicate fiber thermal expansion sealing layer.

[0016] As a preferred technical solution, the water level measuring device includes a two-color water level gauge and a flat water level gauge, and the two-color water level gauge and the flat water level gauge are respectively connected to the waste heat steam generation device through pipelines.

[0017] As a preferred technical solution, the salt content optical measuring device includes a salinity prism refractometer, the flat water level gauge is connected to the salinity prism refractometer through a pipeline, and a stop valve is provided on the pipeline.

[0018] The working method of any of the above-mentioned sulfur-burning furnace high-temperature flue gas waste heat utilization systems is characterized by including the following steps:

[0019] Step 1: Burn fuel in the sulfur-burning furnace, close the second valve, open the second chimney and the third valve; inject water into the waste heat steam generation device;

[0020] Heat the air in the first connecting pipe and the second connecting pipe to 800 - 850 °C, so that the first thermal expansion annular sealing device seals the connection of the first connecting pipe and the second connecting pipe, and the second thermal expansion annular sealing device seals the connection of the waste heat utilization pipe and the flue gas conveying pipe, and discharge the gas through the second chimney and the first chimney; Open each steam outlet valve, and the waste heat steam generating device generates steam and outputs it from each steam outlet valve.

[0021] Step 2: Open the second valve, close the second chimney and the third valve; Stop inputting fuel into the sulfur-burning furnace; Input sulfur-containing substances into the sulfur-burning furnace and burn them, and the flue gas generated by the combustion is output from the flue gas conveying pipe.

[0022] Step 3: When the waste heat utilization system of the high-temperature flue gas of the sulfur-burning furnace needs to be shut down, stop inputting sulfur-containing substances into the sulfur-burning furnace; Input heavy oil into the sulfur-burning furnace for combustion and gradually reduce the fuel input until the air temperature in the first connecting pipe and the second connecting pipe is lower than 100 °C, then stop inputting heavy oil into the sulfur-burning furnace; Stop injecting water into the waste heat steam generating device; Close each steam outlet valve.

[0023] When the waste heat steam generating device generates steam, when the salt content optical measurement device measures that the salt content of the water in the waste heat steam generating device exceeds the standard, the first blowdown valve opens; When the liquid level in the liquid accumulation tank exceeds the set value, the second blowdown valve opens; When the water level measurement device measures that the water level in the waste heat steam generating device is lower than the set value, the water inlet valve opens; When the pressure measurement device measures that the pressure in the waste heat steam generating device exceeds the set value, each safety valve opens.

[0024] The fuel is heavy oil. Description of the Drawings

[0025] Figure 1 is a schematic structural diagram of the waste heat utilization system of the high-temperature flue gas of the sulfur-burning furnace of the present utility model.

[0026] Figure 2 is Figure 1 a partial enlarged view of part B of

[0027] Figure 3 is Figure 1 a partial enlarged view of part C of

[0028] Figure 4 is Figure 3 a partial enlarged view of part E of

[0029] Figure 5 is Figure 1 a partial enlarged view of part D of

[0030] Figure 6 is Figure 1Cross-sectional view of the high-temperature flue gas waste heat utilization system of the sulfur-burning furnace shown along A-A'.

[0031] Figure 7 is Figure 6 Partial enlarged view of part G of

[0032] Figure 8 is Figure 6 Partial enlarged view of part H of

[0033] Figure 9 is Figure 8 Partial enlarged view of part J of

[0034] Figure 10 is Figure 8 Partial enlarged view of part K of

[0035] Figure 11 is Figure 6 Partial enlarged view of part I of

[0036] Figure 12 is Figure 11 Partial enlarged view of part L of

[0037] Wherein: sulfur-burning furnace - 1;

[0038] First connecting pipe - 2; first lining layer - 21; first heat-insulating block layer - 22; first refractory brick layer - 23; first refractory soil layer - 24;

[0039] Second connecting pipe - 3; second lining layer - 31; second heat-insulating block layer - 32; second refractory brick layer - 33; second refractory soil layer - 34;

[0040] Waste heat utilization pipe - 4;

[0041] Flue gas transmission pipe - 5; liquid accumulation tank - 51; second sewage discharge pipe - 52; second sewage discharge valve - 53; liquid level gauge - 54;

[0042] Second valve - 6; second chimney - 7; third valve - 8;

[0043] Waste heat steam generation device - 9; water inlet - 91; water inlet pipe - 92; water inlet valve - 93; sewage outlet - 94; first sewage discharge pipe - 95; first sewage discharge valve - 96; pressure measuring device - 97; steam valve - 98; safety valve - 99;

[0044] First chimney - 10; first valve - 11;

[0045] First thermal expansion annular sealing device - 12; first thermal expansion sealing layer - 121; first expansion joint - 122;

[0046] Second thermal expansion annular sealing device - 13; second expansion joint - 131; second thermal expansion sealing layer - 132. Detailed implementation mode

[0047] Next, the present utility model will be further described in conjunction with the drawings and embodiments.

[0048] Embodiment 1. As Figure 1-12 shown, a waste heat utilization system for high-temperature flue gas in a sulfur-burning furnace, characterized in that it includes a control device, a sulfur-burning furnace 1, a first connecting pipe 2, a second connecting pipe 3, a waste heat utilization pipe 4, and a flue gas conveying pipe 5 that are connected in sequence; a second valve 6 is provided on the flue gas conveying pipe 5; the flue gas conveying pipe 5 is connected to a second chimney 7 and a third valve 8 is provided on the second chimney 7; the second chimney 7 is located on the side of the second valve 6 close to the waste heat utilization pipe 4; the first connecting pipe 2 is connected to a first chimney 10 and a first valve 11 is provided on the first chimney 10; the connection between the first connecting pipe 2 and the second connecting pipe 3 is connected by a first thermal expansion annular sealing device 12, and the connection between the waste heat utilization pipe 4 and the flue gas conveying pipe 5 is connected by a second thermal expansion annular sealing device 13.

[0049] A waste heat steam generation device 9 with an inner cavity is installed above the waste heat utilization pipe 4; the waste heat steam generation device 9 is connected to the waste heat utilization pipe 4 through eight heat conduction fins 41; the waste heat steam generation device 9 is provided with a water inlet 91 communicating with its inner cavity, and the water inlet 91 is connected to a water inlet pipe 92; a water inlet valve 93 is provided on the water inlet pipe 92; the waste heat steam generation device 9 is provided with a sewage discharge port 94 communicating with the bottom of its inner cavity; the sewage discharge port 94 is connected to a first sewage discharge pipe 95, and a first sewage discharge valve 96 is provided on the first sewage discharge pipe 95; the waste heat steam generation device 9 is provided with two steam outlet valves 98, two safety valves 99, and a pressure measuring device 97 communicating with its inner cavity; a water level measuring device is provided on the waste heat steam boiler, and the water level measuring device is connected to a salt content optical measuring device; a liquid accumulation tank 51 is provided at the bottom end of the flue gas conveying pipe 5, a liquid level gauge 54 is provided on the liquid accumulation tank 51, and the liquid accumulation tank 51 is connected to a second sewage discharge pipe 52; a second sewage discharge valve 53 is provided on the second sewage discharge pipe 52; the water level measuring device, the salt content optical measuring device, the pressure measuring device 97, the safety valve 99, the water inlet valve 93, the first sewage discharge valve 96, the safety valve 99, the steam outlet valve 98, the second sewage discharge valve 53, and the liquid level gauge 54 are all connected to the control device.

[0050] A first connecting pipe 2 and a second connecting pipe 3 are arranged between the sulfur-burning furnace and the waste heat utilization pipe 4, and a second valve 6 is provided on the flue gas conveying pipe 5; the flue gas conveying pipe 5 is connected to the second chimney 7 and a third valve 8 is provided on the second chimney 7; the second chimney 7 is located on the side close to the waste heat utilization pipe 4 of the second valve 6; the first connecting pipe 2 is connected to the first chimney 10, and a first valve 11 is provided on the first chimney 10; the connection of the first connecting pipe 2 and the second connecting pipe 3 is connected through a first thermal expansion ring seal device 12, and the connection of the waste heat utilization pipe 4 and the flue gas conveying pipe 5 is connected through a second thermal expansion ring seal device 13. In this way, before burning sulfur-containing substances, by burning dyes, the first thermal expansion ring seal device 12 and the second thermal expansion ring seal device 13 are gradually heated to achieve sealing, solving the problem of the risk of high-temperature sulfur dioxide gas overflow caused by possible cracks between the existing waste heat utilization device and the sulfur-burning furnace. When the waste heat steam generating device 9 generates steam, when the salt content optical measuring device measures that the salt content of the water in the waste heat steam generating device 9 exceeds the standard, the first blowdown valve 96 is opened; when the liquid level in the liquid accumulation tank 51 exceeds the set value, the second blowdown valve 53 is opened; when the water level measuring device measures that the water level in the waste heat steam generating device 9 is lower than the set value, the water inlet valve 93 is opened; when the pressure measuring device 97 measures that the pressure in the waste heat steam generating device 9 exceeds the set value, each safety valve 99 is opened. The waste heat steam generating device 9 is safe to use, can discharge acid liquid, and improve the purity of sulfur dioxide gas.

[0051] The first connecting pipe 2 and the second connecting pipe 3 are coaxially arranged. The first connecting pipe 2 sequentially includes a first lining layer 21, a first heat-insulating block layer 22, a first refractory brick layer 23, and a first refractory soil layer 24 from the inside to the outside; the second connecting pipe 3 sequentially includes a second lining layer 31, a second heat-insulating block layer 32, a second refractory brick layer 33, and a second refractory soil layer 34 from the inside to the outside. Adopting this technical solution can provide heat insulation and improve the efficiency of the waste heat steam generating device 9 at the same time.

[0052] Both the first lining layer 21 and the second lining layer 31 are asbestos lining layers.

[0053] The first thermal expansion ring seal device 12 includes a first thermal expansion seal layer 121 and a first expansion joint 122;

[0054] The first thermal expansion seal layer 121 is located in the gap between the first connecting pipe 2 and the second connecting pipe 3, and a ring-shaped first expansion joint 122 is sleeved on the radially outer peripheral surface of the gap between the first connecting pipe 2 and the second connecting pipe 3.

[0055] The first thermal expansion seal layer 121 is a first aluminum silicate fiber thermal expansion seal layer.

[0056] The second thermal expansion annular sealing device 13 includes a second expansion joint 131; the second expansion joint 131 is sleeved on the radial outer peripheral surface of the connection gap between the waste heat utilization pipeline 4 and the flue gas transportation pipeline 5.

[0057] The second thermal expansion annular sealing device 13 includes a second thermal expansion sealing layer 132, and the second thermal expansion sealing layer is on the connection gap between the waste heat utilization pipeline 4 and the flue gas transportation pipeline 5.

[0058] The second thermal expansion sealing layer 132 is a second aluminum silicate fiber thermal expansion sealing layer.

[0059] The water level measuring device includes a two-color water level gauge 910 and a flat water level gauge 911. The two-color water level gauge 910 and the flat water level gauge 911 are respectively connected to the waste heat steam generating device 9 through pipelines.

[0060] The salt content optical measuring device includes a salinity prism refractometer 912. The flat water level gauge 911 is connected to the salinity prism refractometer 912 through a pipeline, and a stop valve 913 is provided on the pipeline.

[0061] The working method of the waste heat utilization system for high-temperature flue gas in the sulfur-burning furnace is characterized by including the following steps:

[0062] Step 1: Burn fuel in the sulfur-burning furnace 1, close the second valve 6, open the second chimney 7 and the third valve 8; inject water into the waste heat steam generating device 9;

[0063] Heat the air in the first communication pipeline 2 and the second communication pipeline 3 to 800 - 850 °C, so that the first thermal expansion annular sealing device 12 seals the connection of the first communication pipeline 2 and the second communication pipeline 3, and the second thermal expansion annular sealing device 13 seals the connection of the waste heat utilization pipeline 4 and the flue gas transportation pipeline 5. Discharge the gas through the second chimney 7 and the first chimney 10; open each steam outlet valve 98, and the waste heat steam generating device 9 generates steam and outputs it from each steam outlet valve 98.

[0064] Step 2: Open the second valve 6, close the second chimney 7 and the third valve 8; stop inputting fuel into the sulfur-burning furnace 1; input sulfur-containing substances into the sulfur-burning furnace 1 and burn them, and the flue gas generated by the combustion is output from the flue gas transportation pipeline 5.

[0065] Step 3: When the waste heat utilization system for high-temperature flue gas in the sulfur-burning furnace needs to be shut down, stop inputting sulfur-containing substances into the sulfur-burning furnace 1; input heavy oil into the sulfur-burning furnace 1 for combustion and gradually reduce the fuel input amount until the air temperature in the first communication pipeline 2 and the second communication pipeline 3 is lower than 100 degrees Celsius, then stop inputting heavy oil into the sulfur-burning furnace 1; stop injecting water into the waste heat steam generating device 9; close each steam outlet valve 98.

[0066] When the waste heat steam generating device 9 generates steam, when the salt content optical measuring device measures that the salt content of the water in the waste heat steam generating device 9 exceeds the standard, the first blowdown valve 96 opens; when the liquid level in the liquid accumulation tank 51 exceeds the set value, the second blowdown valve 53 opens; when the water level measuring device measures that the water level in the waste heat steam generating device 9 is lower than the set value, the water inlet valve 93 opens; when the pressure measuring device 97 measures that the pressure in the waste heat steam generating device 9 exceeds the set value, each safety valve 99 opens.

[0067] The fuel is heavy oil.

[0068] The above is only the preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, making equivalent substitutions or changes, shall be covered by the protection scope of the present invention.

Claims

1. A system for utilizing waste heat from high-temperature flue gas from a sulfur incinerator, characterized in that: The invention comprises a control device, a sulfur incinerator (1), a first connecting pipe (2), a second connecting pipe (3), a waste heat utilization pipe (4), and a flue gas delivery pipe (5) which are connected in sequence; a second valve (6) is provided on the flue gas delivery pipe (5); the flue gas delivery pipe (5) is connected to a second chimney (7), and a third valve (8) is provided on the second chimney (7); the second chimney (7) is located on the side of the second valve (6) close to the waste heat utilization pipe (4); the first connecting pipe (2) is connected to a first chimney (10), and a first valve (11) is provided on the first chimney (10); the connection between the first connecting pipe (2) and the second connecting pipe (3) is connected via a first thermal expansion annular sealing device (12), and the connection between the waste heat utilization pipe (4) and the flue gas delivery pipe (5) is connected via a second thermal expansion annular sealing device (13); A waste heat steam generating device (9) having an inner cavity is installed above the waste heat utilization pipeline (4); the waste heat steam generating device (9) is connected to the waste heat utilization pipeline (4) via a plurality of heat conducting sheets (41); the waste heat steam generating device (9) is provided with a water inlet (91) communicating with its inner cavity, the water inlet (91) being connected to a water inlet pipe (92); a water inlet valve (93) is provided on the water inlet pipe (92); the waste heat steam generating device (9) is provided with a sewage outlet (94) communicating with the bottom of its inner cavity; the sewage outlet (94) is connected to a first sewage outlet pipe (95), the first sewage outlet pipe (95) being provided with a first sewage outlet valve (96); the waste heat steam generating device (9) is provided with a plurality of steam outlet valves (98) communicating with its inner cavity, A plurality of safety valves (99) and a pressure measuring device (97); a water level measuring device is provided on the waste heat steam boiler, and the water level measuring device is connected to the optical measuring device for salt content; a liquid storage tank (51) is provided at the bottom of the flue gas conveying pipeline (5), a liquid level gauge (54) is provided on the liquid storage tank (51), and the liquid storage tank (51) is connected to the second sewage discharge pipeline (52); the second sewage discharge pipeline (52) is provided with a second sewage discharge valve (53); the water level measuring device, the optical measuring device for salt content, the pressure measuring device (97), the safety valve (99), the water inlet valve (93), the first sewage discharge valve (96), the safety valve (99), the steam outlet valve (98), the second sewage discharge valve (53), and the liquid level gauge (54) are all connected to the control device.

2. The sulfur incinerator high temperature flue gas waste heat utilization system as claimed in claim 1, characterized in that: The first connecting pipe (2) and the second connecting pipe (3) are coaxially arranged. The first connecting pipe (2) comprises, from the inside to the outside, a first cushion layer (21), a first thermal insulation block layer (22), a first refractory brick layer (23), and a first refractory clay layer (24); the second connecting pipe (3) comprises, from the inside to the outside, a second cushion layer (31), a second thermal insulation block layer (32), a second refractory brick layer (33), and a second refractory clay layer (34).

3. The sulfur incinerator high temperature flue gas waste heat utilization system as claimed in claim 2, characterized in that: The first cushion layer (21) and the second cushion layer (31) are both asbestos cushion layers.

4. The sulfur incinerator high temperature flue gas waste heat utilization system as claimed in claim 2, characterized in that: The first thermal expansion annular sealing device (12) comprises a first thermal expansion sealing layer (121) and a first expansion joint (122); The first heat expansion sealing layer (121) is located in the gap between the first communicating pipe (2) and the second communicating pipe (3), and the radial outer peripheral surface of the gap between the first communicating pipe (2) and the second communicating pipe (3) is sleeved with an annular first expansion joint (122).

5. The sulfur incinerator high temperature flue gas waste heat utilization system as claimed in claim 4, characterized in that: The first heat expansion sealing layer (121) is a first aluminum silicate fiber heat expansion sealing layer.

6. The sulfur incinerator high temperature flue gas waste heat utilization system as claimed in claim 1, characterized in that: The second thermal expansion annular sealing device (13) comprises a second expansion joint (131); the second expansion joint (131) is sleeved on the radial outer peripheral surface of the connection gap between the waste heat utilization pipeline (4) and the smoke delivery pipeline (5).

7. The sulfur incinerator high temperature flue gas waste heat utilization system as claimed in claim 6, characterized in that: The second heat expansion annular sealing device (13) comprises a second heat expansion sealing layer (132), and the second heat expansion sealing layer is on the connection gap between the waste heat utilization pipeline (4) and the smoke delivery pipeline (5).

8. The sulfur incinerator high temperature flue gas waste heat utilization system as claimed in claim 7, characterized in that: The second heat expansion sealing layer (132) is a second aluminum silicate fiber heat expansion sealing layer.

9. The sulfur incinerator high temperature flue gas waste heat utilization system as claimed in claim 1, characterized in that: The water level measuring device comprises a two-color water level gauge (910) and a flat-plate water level gauge (911), and the two-color water level gauge (910) and the flat-plate water level gauge (911) are respectively connected to the waste heat steam generating device (9) through pipelines.

10. The sulfur incinerator high temperature flue gas waste heat utilization system as claimed in claim 9, characterized in that: The optical salt content measuring device comprises a salinity prism refractometer (912); a flat water level meter (911) is connected to the salinity prism refractometer (912) via a pipeline, and a stop valve (913) is provided on the pipeline.

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