Sulfur dioxide rich gas pipeline heat tracing device for activated carbon desulfurization and denitrification

Abstract

The utility model discloses a sulfur dioxide rich gas pipeline heat tracing device for activated carbon desulfurization and denitrification, which belongs to the technical field of activated carbon desulfurization and denitrification and comprises a rich gas pipeline and a heat tracing structure. Circulating hot air conveyed by a hot air circulating pipeline is used for carrying out isolated heating on the saturated activated carbon adsorbing sulfur dioxide in a heating area of the desorption tower, and the heated activated carbon is subjected to heat preservation desorption in a desorption area of the desorption tower to generate rich gas; the gas inlet end of the rich gas pipeline is communicated with the rich gas outlet of the analysis area, and the gas outlet end of the rich gas pipeline is communicated with a pretreatment gas inlet of a product system taking sulfur dioxide as a raw material; the heat tracing structure sleeves the outer side of the rich gas pipeline; the heated hot air exhaust part communicates with the heat tracing structure through the hot air exhaust pipeline so as to conduct heat tracing on the rich air pipeline, and the heated hot air flows to the heat tracing exhaust header pipe after heat tracing is completed. Heat tracing is carried out on the rich gas pipeline through high-temperature waste gas, the heat tracing temperature is high, the problem that the rich gas pipeline is blocked is solved, energy is saved, consumption is reduced, and the rich gas pipeline is not limited by sites.

Description

Technical Field

[0001] The utility model belongs to the technical field of activated carbon desulfurization and denitrification, and particularly relates to a sulfur dioxide rich gas pipeline heating device for activated carbon desulfurization and denitrification. Background Art

[0002] After the activated carbon absorbs the sulfur dioxide in the flue gas, the sulfur dioxide in the activated carbon needs to be analyzed and the ammonium bisulfate needs to be decomposed. During analysis, the activated carbon needs to be heated to about 400°C. The activated carbon is heated by hot air isolation. Most of the hot air is recycled, and about 1 / 4 to 1 / 3 of the hot air is discharged. The gas after analysis is usually called sulfur-rich gas (SRG: So2Rich Gas), or rich gas for short. It is mainly composed of sulfur dioxide and nitrogen, and also contains a small amount of ammonia, water vapor, oxygen, sulfur trioxide and other gases. The gas temperature just after analysis is about 400°C. After the gas is discharged from the analysis tower, it enters the subsequent product system with sulfur dioxide as raw material through the rich gas pipeline.

[0003] The rich gas pipeline containing rich gas needs to be insulated. Since the pipeline is too long, in order to prevent the ammonia and sulfur trioxide in the rich gas from generating ammonium bisulfate and causing pipeline blockage, the rich gas pipeline needs to be heated. The general heating is steam heating and electric heating. The general heating temperature must be above 250℃, but 250℃ steam is relatively rare in the factory, and the steam pressure is high and dangerous. Electric heating to 250℃ consumes a lot of energy.

[0004] In the design of activated carbon desulfurization and denitrification, the analytical tower and the product system with sulfur dioxide as raw material are placed as close as possible to reduce the blockage of the rich gas pipeline. However, sometimes, due to limited layout space, the site of the product system with sulfur dioxide as raw material can only be placed in a farther place.

[0005] Therefore, it is necessary to study a sulfur dioxide-rich gas pipeline heating device for activated carbon desulfurization and denitrification that is not restricted by the layout site. Utility Model Content

[0006] In order to at least solve the blockage problem of sulfur dioxide rich gas pipeline in the above-mentioned prior art, the utility model provides the following technical solution: a sulfur dioxide rich gas pipeline heating device for activated carbon desulfurization and denitrification, the sulfur dioxide rich gas pipeline heating device comprising: a rich gas pipeline and a heating structure;

[0007] The circulating hot air transported by the hot air circulation pipeline isolates and heats the activated carbon saturated with adsorbed sulfur dioxide in the heating zone of the desorption tower, and the heated activated carbon generates rich gas after heat preservation and desorption in the desorption zone of the desorption tower;

[0008] The gas inlet end of the rich gas pipeline is connected to the rich gas outlet of the desorption zone, and the gas outlet end of the rich gas pipeline is connected to the pre-treatment gas inlet of the product system using sulfur dioxide as raw material;

[0009] The heat tracing structure is sleeved on the outside of the rich gas pipeline;

[0010] The hot air discharged after heating is connected to the heating structure through the hot air discharge pipeline to heat the rich gas pipeline, and flows to the heating exhaust main pipe after heating.

[0011] Optionally, in the above-mentioned sulfur dioxide-rich gas pipeline heating device, a hot air furnace generates hot air, and the hot air furnace is connected to the air inlet and the air outlet of the heating zone of the desorption tower through the hot air circulation pipeline;

[0012] A heat circulation fan is installed on the hot air circulation pipeline to drive the hot air to form a circulating airflow between the hot air furnace and the heating area.

[0013] Optionally, in the above-mentioned sulfur dioxide-rich gas pipeline heating device, the heating structure includes: a plurality of heating units, and the hot air exhaust pipeline includes: a heating air intake main pipe, a heating air intake branch pipe and a heating air exhaust branch pipe;

[0014] One end of the heating air intake main pipe is connected to the hot air circulation pipeline, and a regulating valve is installed on the heating air intake main pipe to control the amount of hot air discharged externally;

[0015] A plurality of air outlets are arranged at intervals on the heating air inlet main pipe along the length direction of the heating air inlet main pipe, and the plurality of air outlets are respectively connected to one end of a plurality of the heating air inlet branch pipes, and the other end of the heating air inlet branch pipe is connected to the heating unit;

[0016] A plurality of air inlets are arranged at intervals on the heating exhaust main pipe along the length direction of the heating exhaust main pipe, and the air inlets are connected to the heating unit through the heating exhaust branch pipe.

[0017] Optionally, in the above-mentioned sulfur dioxide rich gas pipeline heating device, the rich gas pipeline is formed by connecting a plurality of straight pipes and a plurality of elbows end to end in series, and the heating unit comprises a heating sleeve and a heating box;

[0018] The heating sleeve is sleeved on the outside of the straight pipe and the heating box is sleeved on the outside of the elbow to form a hot air chamber on the periphery of the rich gas pipeline. The heating sleeve and the heating box are both provided with a hot air inlet and a hot air outlet.

[0019] Optionally, in the above-mentioned sulfur dioxide-rich gas pipeline heating device, all hot air inlets are connected to the heating air inlet main pipe through the heating air inlet branch pipe, and all hot air outlets are connected to the heating air exhaust main pipe through the heating air exhaust branch pipe.

[0020] Optionally, in the above-mentioned sulfur dioxide rich gas pipeline heating device, along the length direction of the rich gas pipeline, the hot air inlet of the heating sleeve or the heating box located at the first position is connected to the heating air inlet main pipe, the hot air outlet of the heating sleeve or the heating box located at the last position is connected to the heating exhaust main pipe, the adjacent heating sleeves and the heating boxes located in the middle part are connected by a connecting pipe, the hot air inlets of the remaining several heating sleeves and several heating boxes are connected to the air outlets arranged at intervals on the heating air inlet main pipe through the heating air inlet branch pipe, and the hot air outlets of several heating sleeves and several heating boxes are connected to the air inlets arranged at intervals on the heating exhaust main pipe through the heating exhaust branch pipe.

[0021] Optionally, in the above-mentioned sulfur dioxide rich gas pipeline heating device, along the length direction of the rich gas pipeline, one end of the heating structure is connected to the hot air exhaust pipeline, and the other end of the heating structure is connected to the heating exhaust main pipe.

[0022] Optionally, in the above-mentioned sulfur dioxide rich gas pipeline heating device, the flow direction of the rich gas in the rich gas pipeline is consistent with the flow direction of the hot air in the heating structure.

[0023] Optionally, in the above-mentioned sulfur dioxide rich gas pipeline heating device, the heating temperature of the hot air on the rich gas pipeline is higher than 250°C.

[0024] Optionally, in the above-mentioned sulfur dioxide-rich gas pipeline heating device, the cross-section of the heating structure is square and / or circular.

[0025] The beneficial effects brought by the technical solution provided by the embodiment of the utility model are:

[0026] 1) A heating structure is set on the outside of the rich gas pipeline, and the high-temperature exhaust gas (circulating hot air) after heating in the heating zone of the analysis tower is introduced into the heating structure. The rich gas flows inside the rich gas pipeline, and the high-temperature exhaust gas circulates along the outer wall of the rich gas pipeline and transfers heat to the rich gas pipeline, thereby avoiding the cooling of the rich gas pipeline, which causes ammonia and sulfur trioxide in the rich gas to generate ammonium bisulfate to block the pipeline. The high-temperature exhaust gas discharged has a high heating temperature, which realizes the reuse of waste heat and saves energy and reduces consumption;

[0027] 2) The gas-rich pipeline is formed by a number of straight pipes and a number of elbows connected end to end in a closed manner, and is not limited by the site. An appropriate number of straight pipes and elbows can be used according to the actual situation;

[0028] 3) By introducing the hot air generated when the heating zone of the analytical tower is preheated into the heating structure, the hot air preheats the rich gas pipeline to prevent the rich gas that has just entered the rich gas pipeline from cooling down sharply. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A schematic diagram of the structure of a sulfur dioxide-rich gas pipeline heating device for activated carbon desulfurization and denitrification provided in an embodiment of the utility model;

[0030] Figure 2 A schematic diagram of the structure of the heating structure in the sulfur dioxide-rich gas pipeline heating device for activated carbon desulfurization and denitrification provided by the embodiment of the utility model;

[0031] Figure 3 A schematic diagram of the combined structure of a heating sleeve and a straight pipe in a sulfur dioxide-rich gas pipeline heating device for activated carbon desulfurization and denitrification provided in an embodiment of the utility model;

[0032] Figure 4 A schematic diagram of the combined structure of a heating box and an elbow in a sulfur dioxide-rich gas pipeline heating device for activated carbon desulfurization and denitrification provided by an embodiment of the utility model;

[0033] In the figure: 1. rich gas pipeline; 101. straight pipe; 102. elbow; 2. heating structure; 201. heating sleeve; 202. heating box; 203. connecting pipe; 3. hot air furnace; 4. heat circulation fan; 5. analysis tower; 501. storage area; 502. heating area; 503. analysis area; 504. cooling area; 505. air inlet; 506. exhaust outlet; 507. rich gas outlet; 6. hot air circulation pipeline; 7. product system with sulfur dioxide as raw material; 8. heating air intake main pipe; 801. regulating valve; 9. heating air intake branch pipe; 10. heating exhaust branch pipe; 11. heating exhaust main pipe. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the present invention more clear, the implementation mode of the present invention will be further described in detail below with reference to the accompanying drawings.

[0035] In the description of the present invention, the terms "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention. The terms "connected", "connected" and "set" used in the present invention should be understood in a broad sense. For example, they can be fixed connections or detachable connections; they can be directly connected or indirectly connected through intermediate components; they can be wired electrical connections, radio connections, or wireless communication signal connections. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0036] See also Figure 1-4The utility model provides the following technical solutions: a sulfur dioxide rich gas pipeline heating device for activated carbon desulfurization and denitrification, the sulfur dioxide rich gas pipeline heating device comprises: a rich gas pipeline 1 and a heating structure 2. The circulating hot air delivered by the hot air circulation pipeline 6 isolates and heats the activated carbon saturated with adsorbed sulfur dioxide in the heating zone 502 of the desorption tower 5, and the heated activated carbon is subjected to thermal insulation desorption in the desorption zone 503 of the desorption tower 5 to produce rich gas (i.e. SRG, which refers to sulfur-rich gas mainly containing sulfur dioxide and also containing gases such as ammonia and sulfur trioxide), and the temperature of the just-desorbed rich gas is about 400°C. The air inlet end of the rich gas pipeline 1 is connected to the rich gas outlet 507 of the desorption zone 503, and the air outlet end of the rich gas pipeline 1 is connected to the pre-treatment air inlet of the product system 7 with sulfur dioxide as the raw material, so that the rich gas flows out from the rich gas outlet 507 of the desorption zone 503 and flows into the pre-treatment air inlet of the product system of the raw material along the rich gas pipeline 1. The heating structure 2 is sleeved on the outer side of the rich gas pipeline 1. After the circulating hot air heats the activated carbon, the heat energy is lost and the temperature drops, so the heat energy needs to be supplemented. The general way to supplement the heat energy is to burn coal gas and supplement air through the hot air furnace 3. In this way, the amount of circulating gas will increase. In order to maintain the pressure in the hot air circulation pipeline 6, it is necessary to release the pressure, that is, it is necessary to discharge a part of the circulating hot air (i.e., high-temperature exhaust gas) to ensure the balance of the circulating hot air. The hot air circulation pipeline 6 is connected with the heating structure 2 through the hot air exhaust pipeline. The hot air discharged after heating in the heating zone 502 of the analysis tower 5 enters the heating structure 2 along the hot air exhaust pipeline and fills the cavity between the inner wall of the heating structure 2 and the outer wall of the rich gas pipeline 1. When the rich gas flows along the rich gas pipeline 1 to the product system of the raw material, the hot air in the peripheral heating structure 2 flows forward along the length direction of the rich gas pipeline 1 and transfers part of the heat to the wall of the rich gas pipeline 1 to heat (i.e., keep the rich gas pipeline 1 warm). The heating temperature of the discharged hot air (i.e., high-temperature exhaust gas) is high, reaching above 250°C, thereby avoiding the situation where the rich gas pipeline 1 is too long and the rich gas in the pipeline cools down sharply to generate ammonium bisulfate to block the pipeline, thereby realizing the reuse of waste heat and saving energy and reducing consumption. Finally, the hot air that has completed the heating flows to the heating exhaust main pipe 11. It should be noted that if the equipment detects that the sulfur dioxide produced by the hot blast furnace 3 is low and does not affect the emission standards, the hot air after heating will be directly discharged to the chimney through the heating exhaust main pipe 11. If the equipment detects that the sulfur dioxide content produced by the hot blast furnace 3 is high and affects the emission standards, the hot air after heating needs to be discharged from the chimney through the heating exhaust main pipe 11 to the inlet of the activated carbon desulfurization and denitrification equipment for desulfurization before being discharged from the chimney.

[0037] Reference Figure 1As shown, according to the process of heating and analyzing the activated carbon saturated with adsorbed sulfur dioxide in the analysis tower 5 to finally produce regenerated activated carbon (or reduce activated carbon), the interior of the analysis tower 5 is sequentially provided with a storage area 501, a heating area 502, a analysis area 503 and a cooling area 504. The heating area 502 of the analysis tower 5 is provided with an air inlet 505 and an air outlet 506, and the analysis area 503 of the analysis tower 5 is provided with a rich gas outlet 507. The hot blast furnace 3 generates hot blast, for example, by supplying gas to the burner through a long open flame to burn combustible gas (combustion gas and combustion-supporting air) to generate hot blast. The hot blast furnace 3 is connected to the air inlet 505 and the air outlet 506 of the heating area 502 of the analysis tower 5 through a hot blast circulation pipeline 6, and a hot blast circulation fan 4 is installed on the hot blast circulation pipeline 6. The hot blast circulation fan 4 is started to drive the hot blast to form a circulating airflow between the hot blast furnace 3 and the heating area 502 to form circulating hot blast.

[0038] The heating structure 2 includes: a plurality of heating units. The hot air exhaust pipeline includes: a heating air intake main pipe 8, a heating air intake branch pipe 9 and a heating air exhaust branch pipe 10 which are arranged in order from near to far from the inner and outer exhaust ports. One end of the heating air intake main pipe 8 is connected to the hot air circulation pipeline 6, so that the hot air exhaust part that has completed heating can flow into the heating structure 2 along the heating air intake main pipe 8. After heating the activated carbon, the circulating hot air loses heat energy and the temperature drops, and the heat energy needs to be supplemented. While supplementing the heat energy, the amount of circulating gas will increase. In order to maintain the pressure in the hot air circulation pipeline 6, it is necessary to release the pressure. Therefore, a regulating valve 801 is installed on the heating air intake main pipe 8. The pressure change of the hot air in the hot air circulation pipeline 6 gives a signal to the regulating valve 801, and the regulating valve 801 automatically adjusts the opening, thereby controlling the amount of the exhaust hot air and ensuring the pressure balance of the circulating hot air. The commonly used gas regulating valve 801 in the art can be used, and the present embodiment does not limit the structure of the regulating valve 801. Several air outlets are arranged at intervals on the heating air intake main pipe 8 along the length direction of the heating air intake main pipe 8, and the several air outlets are respectively connected to one end of several heating air intake branch pipes 9, and the other end of the heating air intake branch pipes 9 is connected to the heating unit, so that the hot air heating air intake main pipe 8 can flow into each heating unit along the several heating air intake branch pipes 9. Several air inlets are arranged at intervals on the heating exhaust main pipe 11 along the length direction of the heating exhaust main pipe 11, and the air inlets are connected to the heating unit through the heating exhaust branch pipe 10. Preferably, the flow direction of the hot air in the heating unit is consistent with the flow direction of the rich air in the rich air pipeline 1. After the hot air completes the heating, it flows out of the heating unit along the several heating exhaust branch pipes 10.

[0039] In order to no longer be restricted by the layout site, a plurality of straight pipes 101 and a plurality of elbows 102 are connected in series end to end to form a gas-enriched pipeline 1. These straight pipes 101 and elbows 102 are prefabricated in a processing plant and can be assembled and arranged flexibly. The actual situation of the construction site determines the number of straight pipes 101 and elbows 102 to be used. The actual shape and length of the gas-enriched pipeline 1 are consistent with the site, and the straight pipes 101 and elbows 102 can be connected by flanges or welded together, which is not limited in this embodiment. It should be noted that if the site is large or small enough, only one of the straight pipes 101 or the elbows 102 can be used. (such as Figure 3 and Figure 4 The above-mentioned heating unit has a heating sleeve 201 and a heating box 202. The heating sleeve 201 is sleeved on the outside of the straight pipe 101, and the heating box 202 is sleeved on the outside of the elbow 102, which makes the diameter of the heating sleeve 201 larger than the diameter of the straight pipe 101, and the width of the heating box 202 is larger than the diameter of the elbow 102. The cross-section of the heating structure 2 can be various shapes such as square and circular, as long as it can wrap the straight pipe 101 or the elbow 102, and there is a cavity between the heating sleeve 201 and the straight pipe 101, and between the heating box 202 and the elbow 102, so as to create conditions for heating the rich gas pipeline 1 with the circulating hot air (that is, the heat medium) discharged from the outside. When the heating structure 2 is sleeved on the outside of the rich gas pipeline 1, the hot air on the outside of the rich gas pipeline 1 flows along the length direction of the heating sleeve, and then the hot air heats the rich gas pipeline 1, thereby avoiding the rapid cooling of the rich gas in the rich gas pipeline 1. The heating sleeve 201 and the heating box 202 are both provided with a hot air inlet and a hot air outlet, so that the hot air can enter the cavity, complete the heating of the rich gas pipeline 1 and then flow out of the cavity.

[0040] The following specifically introduces several conventional connection methods between the heating air inlet branch pipe 9 and the heating unit:

[0041] Embodiment 1

[0042] In this embodiment, the hot air inlets on all the heating sleeves 201 and the heating boxes 202 are connected to the heating air intake main pipe 8, and the hot air outlets on all the heating sleeves 201 and the heating boxes 202 are connected to the heating exhaust main pipe 11, forming multiple passages. Specifically, after all the heating sleeves 201 and the heating boxes 202 are assembled, the hot air inlets on all the heating sleeves 201 and the heating boxes 202 are connected to the air outlets (of course, also including a port) arranged at intervals on the heating air intake main pipe 8 through the heating air intake branch pipe 9, and the hot air outlets on all the heating sleeves 201 and the heating boxes 202 are connected to the air inlets (of course, also including a port) arranged at intervals on the heating exhaust main pipe 11 through the heating exhaust branch pipe 10.

[0043] Embodiment 2

[0044] The difference from the first embodiment is that only one passage is formed in the second embodiment, and along the length direction of the rich gas pipeline 1, one end of the heating structure 2 is connected to the hot air exhaust pipeline, and the other end of the heating structure 2 is connected to the heating exhaust main pipe 11. It should be noted that since only one passage is formed, there is no need to set an air outlet on the pipe wall of the heating air inlet main pipe 8. At the same time, since the heating structure 2 is specifically composed of a plurality of heating sleeves 201 and heating boxes 202, the middle part of them is actually connected by a plurality of connecting pipes 203. Specifically, after all the heating sleeves 201 and heating boxes 202 are assembled, along the length direction of the rich gas pipeline 1, the hot air inlet of the heating sleeve 201 or heating box 202 located at the first position is directly connected to the heating air inlet main pipe 8, the adjacent heating sleeves 201 and heating boxes 202 located in the middle are connected through the connecting pipe 203 to form a hot air passage, and the hot air outlet of the heating sleeve 201 or heating box 202 located at the last position is connected to the heating exhaust main pipe 11.

[0045] Embodiment 3

[0046] Reference Figure 1-2 As shown, in combination with the connection methods of the first and second embodiments, a portion of the ports of the heating sleeve 201 and the heating box 202 in the third embodiment are connected using a connecting pipe 203 to form a cascade utilization of energy. Specifically, after all the heating sleeves 201 and the heating boxes 202 are assembled, along the length direction of the rich gas pipeline 1, the hot air inlet of the heating sleeve 201 or the heating box 202 located at the first position is connected to the heating air inlet main pipe 8, and the hot air outlet of the heating sleeve 201 or the heating box 202 located at the last position is connected to the heating exhaust main pipe 11, and the adjacent heating sleeves 201 and heating boxes 202 located in the middle part are connected through the connecting pipe 203, and the hot air inlets of the remaining several heating sleeves 201 and several heating boxes 202 are connected to the air outlets arranged at intervals on the heating air inlet main pipe 8 through the heating air inlet branch pipe 9, and the hot air outlets of the several heating sleeves 201 and several heating boxes 202 are connected to the air inlets arranged at intervals on the heating exhaust main pipe 11 through the heating exhaust branch pipe 10.

[0047] Taking the case where both the heated air intake branch pipe 9 and the heated exhaust branch pipe 10 are two-way branch pipes as an example, the process of heating the rich gas pipeline 1 by the heating structure 2 is described as follows:

[0048] Reference Figure 2As shown, in this embodiment, according to the actual setting site conditions, the rich gas pipeline 1 is Z-shaped, and the rich gas pipeline 1 is composed of a first straight pipe 101, a first elbow 102, a second elbow 102 and a second straight pipe 101 in sequence from right to left. The rich gas (SRG) flows out from the rich gas outlet 507 of the desorption zone 503 and enters the first straight pipe 101 of the rich gas pipeline 1. A portion of the exhaust hot air (high-temperature exhaust gas) transported by the heating intake main pipe 8 flows into the cavity of the heating sleeve 201 outside the first straight pipe 101 along the branch heating intake branch pipe 9, and part of the heat in the hot air is transferred to the pipe wall of the first straight pipe 101. Then the hot air flows into the cavity of the heating box 202 outside the first elbow 102 along the first connecting pipe 203, and part of the heat in the hot air is transferred to the pipe wall of the first elbow 102. At the same time, the rich gas on the inside flows into the first elbow 102 along the first straight pipe 101. After the heating is completed, the hot air flows into the heating exhaust main pipe 11 along the branch heating exhaust branch pipe 10; the rich gas flowing into the first elbow 102 flows into the second elbow 102, and the rest of the exhaust hot air (high-temperature exhaust gas) transported by the heating intake main pipe 8 flows along The hot air flows into the cavity of the heating box 202 outside the second elbow 102 along the other branch heating inlet branch 9, and part of the heat in the hot air is transferred to the pipe wall of the second elbow 102. Then the hot air flows into the cavity of the heating sleeve 201 outside the second straight pipe 101 along the second connecting pipe 203, and part of the heat in the hot air is transferred to the pipe wall of the second straight pipe 101. At the same time, the rich gas inside the second elbow 102 flows into the second straight pipe 101, so that the heating temperature of the rich gas pipeline 1 inside the heating structure 2 is higher than 250°C, avoiding the rapid cooling of the rich gas in the rich gas pipeline 1. After the heating is completed, the hot air flows into the heating exhaust main pipe 11 along another branch heating exhaust branch 10, and the rich gas in the heated rich gas pipeline 1 flows to the product system 7 with sulfur dioxide as raw material. It should be noted that the first and second appearing in this embodiment are only for the convenience of description, and their structures are no different. In addition, it can be understood that, in actual installation, the two branch heating air inlet branch pipes 9 can both be connected to the hot air outlet on the side wall of the heating air inlet main pipe 8, or one branch can be connected to the hot air outlet on the side wall of the heating air inlet main pipe 8 (the port away from the hot air circulation pipeline 6 is blocked), and the other branch is connected to a port of the heating air inlet main pipe 8. Similarly, the two branch heating exhaust branch pipes 10 can both be connected to the hot air inlet on the side wall of the heating exhaust main pipe 11 (the port away from the chimney is blocked), or one branch can be connected to the hot air inlet on the side wall of the heating exhaust main pipe 11, and the other branch can be connected to a port of the heating exhaust main pipe 11.

[0049] For a specific embodiment of the process of generating regenerated activated carbon (reduced activated carbon) from saturated activated carbon in the analytical tower 5, refer to Figure 1As shown, saturated activated carbon (referring to activated carbon that fully absorbs sulfur dioxide and other gases in flue gas) is first added into the storage area 501 of the analysis tower 5, and then the saturated activated carbon enters the heating area 502 from the storage area 501, and the saturated activated carbon is isolated and heated in the heating area 502 by the circulating hot air transported by the hot air circulation pipeline 6, and the heated saturated activated carbon enters the analysis area 503 for analysis to produce rich gas, and at the same time the activated carbon (i.e., regenerated activated carbon) is reduced, and finally the regenerated activated carbon enters the cooling area 504 for cooling and is discharged from the analysis tower 5 through the discharge port of the cooling area 504.

[0050] The utility model also provides the following technical solution: a heating method for a sulfur dioxide-rich gas pipeline 1, using any of the above-mentioned heating devices for the sulfur dioxide-rich gas pipeline 1, the heating method comprising:

[0051] 1) Before starting the decomposition tower 5, it is first preheated by circulating hot air, and then the exhaust part of the preheated hot air is introduced into the heating structure 2 (including multiple heating units) outside the rich gas pipeline 1.

[0052] Specifically, before starting the analysis tower 5, the circulating hot air transported by the hot air circulation pipeline 6 is first used to preheat the heating zone 502 of the analysis tower 5, and then the exhaust part of the hot air generated during the preheating is introduced into the cavity of the heating structure 2 (that is, multiple heating units) on the outside of the rich gas pipeline 1 through the hot air exhaust pipeline. The exhaust hot air can preheat the rich gas pipeline 1, increase the temperature of the rich gas pipeline 1, and prevent the rich gas that has just entered the rich gas pipeline 1 from cooling down sharply.

[0053] 2) The analysis tower 5 is started, and activated carbon saturated with adsorbed sulfur dioxide is added to the analysis tower 5, and isolated heating and thermal insulation analysis are performed in sequence, and the rich gas generated by the thermal insulation analysis is introduced into the rich gas pipeline 1.

[0054] Specifically, the analysis tower 5 is started, and saturated activated carbon that has fully adsorbed sulfur dioxide and other gases in the flue gas is added into the analysis tower 5. The saturated activated carbon enters the heating zone 502 from the storage zone 501 of the analysis tower 5, and is first isolated and heated by circulating hot air in the heating zone 502. Then, the heated saturated activated carbon enters the analysis zone 503 of the analysis tower 5, undergoes thermal insulation analysis, and generates rich gas (SRG). At the same time, the regenerated activated carbon is reduced (reduced activated carbon). The rich gas flows out from the rich gas outlet 507 on the analysis zone 503 and enters the rich gas pipeline 1, while the regenerated activated carbon enters the cooling zone 504 for cooling.

[0055] 3) The discharged part of the hot air that has been heated (referring to the high-temperature exhaust gas) is introduced into the heating structure 2 (including multiple heating units), and finally the hot air that has been heated along the rich gas pipeline 1 is discharged from the heating structure 2 to the heating exhaust main pipe 11.

[0056] Specifically, a portion of the hot air is discharged to the outside after heating (the specific external discharge volume is controlled by the regulating valve 801), and the discharged hot air enters the corresponding heating unit through the heating air intake main pipe 8 and the heating air intake branch pipe 9 in turn (multiple paths), or directly flows into the heating unit through the heating air intake main pipe 8 (one path). In the cavity of the heating unit, the hot air is subjected to heat transfer to increase the temperature of the outer wall of the inner rich gas pipe 1, thereby achieving heating (insulation) of the rich gas pipe 1, and the heating temperature is higher than 250°C. Finally, the hot air that has completed the heating along the rich gas pipe 1 flows out of the heating unit, and flows into the heating exhaust main pipe 11 (multiple paths) through the multi-branch heating exhaust branch pipes 10, or directly flows into the heating exhaust main pipe 11 (one path).

[0057] It is known from common technical knowledge that the present invention can be implemented by other embodiments that do not deviate from its spirit or essential features. Therefore, the embodiments disclosed above are only illustrative in all respects and are not exclusive. All changes within the scope of the present invention or within the scope equivalent to the present invention are included in the present invention.

Claims

1. An activated carbon desulfurization and denitrification sulfur dioxide rich gas pipeline heating device, characterized in that: The sulfur dioxide rich gas pipeline heating device comprises: a rich gas pipeline and a heating structure; The circulating hot air transported by the hot air circulation pipeline isolates and heats the activated carbon saturated with adsorbed sulfur dioxide in the heating zone of the desorption tower, and the heated activated carbon generates rich gas after heat preservation and desorption in the desorption zone of the desorption tower; The gas inlet end of the rich gas pipeline is connected to the rich gas outlet of the desorption zone, and the gas outlet end of the rich gas pipeline is connected to the pre-treatment gas inlet of the product system using sulfur dioxide as raw material; The heat tracing structure is sleeved on the outside of the rich gas pipeline; The hot air discharged after heating is connected to the heating structure through the hot air discharge pipeline to heat the rich gas pipeline, and flows to the heating exhaust main pipe after heating.

2. The sulfur dioxide rich gas pipeline heating device according to claim 1, characterized in that: The hot air furnace generates hot air, and the hot air furnace is connected to the air inlet and the air outlet of the heating zone of the analytical tower through the hot air circulation pipeline; A heat circulation fan is installed on the hot air circulation pipeline to drive the hot air to form a circulating airflow between the hot air furnace and the heating area.

3. The sulfur dioxide rich gas pipeline heating device according to claim 1, characterized in that: The heating structure includes: a plurality of heating units, and the hot air exhaust pipeline includes: a heating air intake main pipe, a heating air intake branch pipe and a heating air exhaust branch pipe; One end of the heating air intake main pipe is connected to the hot air circulation pipeline, and a regulating valve is installed on the heating air intake main pipe to control the amount of hot air discharged externally; A plurality of air outlets are arranged at intervals on the heating air inlet main pipe along the length direction of the heating air inlet main pipe, and the plurality of air outlets are respectively connected to one end of a plurality of the heating air inlet branch pipes, and the other end of the heating air inlet branch pipe is connected to the heating unit; A plurality of air inlets are arranged at intervals on the heating exhaust main pipe along the length direction of the heating exhaust main pipe, and the air inlets are connected to the heating unit through the heating exhaust branch pipe.

4. The sulfur dioxide rich gas pipeline heating device according to claim 3, characterized in that: The rich gas pipeline is formed by connecting a plurality of straight pipes and a plurality of elbows end to end in series, and the heating unit comprises a heating sleeve and a heating box; The heating sleeve is sleeved on the outside of the straight pipe and the heating box is sleeved on the outside of the elbow to form a hot air chamber on the periphery of the rich gas pipeline. The heating sleeve and the heating box are both provided with a hot air inlet and a hot air outlet.

5. The sulfur dioxide rich gas pipeline heating device according to claim 4, characterized in that: All hot air inlets are connected to the heating air inlet main pipe through the heating air inlet branch pipe, and all hot air outlets are connected to the heating air exhaust main pipe through the heating air exhaust branch pipe.

6. The sulfur dioxide rich gas pipeline heating device according to claim 4, characterized in that: Along the length direction of the rich gas pipeline, the hot air inlet of the heating sleeve or the heating box located at the first position is connected to the heating air inlet main pipe, the hot air outlet of the heating sleeve or the heating box located at the last position is connected to the heating exhaust main pipe, the adjacent heating sleeves and the heating boxes located in the middle part are connected through a connecting pipe, and the hot air inlets of the remaining several heating sleeves and several heating boxes are connected to the air outlets arranged at intervals on the heating air inlet main pipe through the heating air inlet branch pipe, and the hot air outlets of several heating sleeves and several heating boxes are connected to the air inlets arranged at intervals on the heating exhaust main pipe through the heating exhaust branch pipe.

7. The sulfur dioxide rich gas pipeline heating device according to claim 1, characterized in that: Along the length direction of the rich gas pipeline, one end of the heating structure is communicated with the hot air exhaust pipeline, and the other end of the heating structure is communicated with the heating exhaust main pipe.

8. The sulfur dioxide rich gas pipeline heating device according to claim 1, characterized in that: The flow direction of the rich gas in the rich gas pipeline is consistent with the flow direction of the hot air in the heating structure.

9. The sulfur dioxide rich gas pipeline heating device according to claim 1, characterized in that: The heating temperature of the hot air on the rich gas pipeline is higher than 250°C.

10. The sulfur dioxide rich gas pipeline heating device according to claim 1, characterized in that: The cross section of the heating structure is square and / or circular.

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