Waste heat recovery power generation system for disposing steel dust and sludge by utilizing rotary kiln

Abstract

The utility model relates to the technical field of solid waste disposal and waste heat recovery, in particular to a waste heat recovery power generation system for disposing steel dust and sludge by utilizing a rotary kiln, which comprises a steel dust and sludge treatment module, a flue gas treatment waste heat recovery module, a low-temperature power generation module and a high-temperature power generation module. According to the utility model, steel dust and sludge are recycled, and waste heat recovery in the process is also considered, so that the economic benefit is better; high-temperature and low-temperature waste heat power generation systems are adopted for waste heat of different tastes, and the waste heat is recycled in a stepped mode; meanwhile, in consideration of large dust capacity of kiln tail flue gas and extremely high adhesion of dust, a heat conduction oil waste heat boiler is arranged in a horizontal mode, the front portion of the boiler adopts a radiation heat exchange surface, and dust on the heat exchange surface of the boiler is reduced as much as possible; for kiln tail high-temperature waste heat, an organic working medium power generation system is adopted, and the system power generation efficiency is high.

Description

Technical Field

[0001] The utility model relates to the technical field of solid waste disposal and waste heat recovery, in particular to a waste heat recovery power generation system for disposing of steel dust and sludge by using a rotary kiln. Background Technique

[0002] During the production process of iron and steel enterprises, a large amount of iron-containing dust and sludge will be generated, mainly including sintering dust removal ash, blast furnace gas ash or mud, converter dust removal ash or mud, scale, etc. Most of these dust and sludge are directly recycled to the sintering process after recovery. However, with the continuous enrichment of zinc elements in the production cycle and the increasing proportion of waste galvanized scale used in steelmaking, the zinc content in some of the above iron-containing dust materials also shows a gradually increasing trend, affecting the equipment life and the smooth progress of the process production. However, the above metallurgical dust and sludge have a high iron content and contain a high amount of carbon, which is a valuable renewable resource. Therefore, it is of positive significance to develop a reasonable process for the utilization of steel dust and sludge and waste heat recovery. Content of the Utility Model

[0003] The purpose of the utility model is to provide a waste heat recovery power generation system for disposing of steel dust and sludge by using a rotary kiln, so as to solve the problems put forward in the above background technique.

[0004] In order to solve the above technical problems, the utility model provides the following technical solution: A waste heat recovery power generation system for disposing of steel dust and sludge by using a rotary kiln, including a steel dust and sludge treatment module, a flue gas treatment waste heat recovery module, a low-temperature power generation module and a high-temperature power generation module;

[0005] The steel dust and sludge treatment module includes a rotary kiln, a coal injection gun, an induced draft fan, a kiln tail smoke chamber and a gravity settling chamber. The rotary kiln is used for reducing and roasting the mixed material of iron-containing dust to form kiln slag. The coal injection gun is used for blowing pulverized coal into the rotary kiln for combustion to heat the mixed material. The induced draft fan is used for sending the flue gas generated during the combustion of pulverized coal from the kiln tail smoke chamber into the gravity settling chamber;

[0006] The flue gas treatment waste heat recovery module includes a drum cooler and a waste heat boiler. The drum cooler is used for exchanging heat between the kiln slag and circulating cooling water, and the heat-exchanged circulating cooling water is supplied to the low-temperature power generation module for use;

[0007] The waste heat boiler is used for receiving the flue gas conveyed by the gravity settling chamber and exchanging heat between the flue gas and heat-conducting oil. The heat-exchanged heat-conducting oil is supplied to the high-temperature power generation module for use;

[0008] The low-temperature power generation module uses the heat obtained by exchanging heat with circulating cooling water to heat the organic working medium, and conveys the cooled circulating cooling water back into the drum cooler;

[0009] The high-temperature power generation module uses the heat obtained from heat exchange with heat-conducting oil to heat the organic working fluid, and conveys the cooled heat-conducting oil back into the waste heat boiler.

[0010] Further, the steel dust and sludge treatment module includes a first air blower and a kiln head hood. The air outlet of the first air blower is connected to the air inlet of the coal throwing gun, the material outlet of the coal throwing gun is connected to the kiln head hood, and the kiln head hood is arranged at the end of the rotary kiln.

[0011] Further, the steel dust and sludge treatment module further includes a kiln tail feeding port, a kiln tail smoke chamber and a No. 1 zipper conveyor. The kiln tail feeding port penetrates through the kiln tail smoke chamber and is connected to the rotary kiln. The kiln tail feeding port is used to convey the mixed materials into the rotary kiln. The kiln tail smoke chamber communicates with the gravity settling chamber. A No. 1 zipper conveyor is arranged at the bottom of the gravity settling chamber, and the No. 1 zipper conveyor is used to return the settled materials to the kiln tail feeding port.

[0012] Further, the steel dust and sludge treatment module further includes a suction fan, a kiln head dust collector and an air cooler. The suction fan is connected to the kiln head dust collector, the kiln head dust collector is connected to the air cooler, and the air cooler is connected to the kiln head hood.

[0013] Further, the flue gas treatment and waste heat recovery module further includes a waste heat boiler, a flue gas and air valve, a second air blower, an air heater, a bag filter, an induced draft fan, a desulfurization tower, a chimney, a No. 2 zipper conveyor, a No. 3 zipper conveyor, and a screw conveyor;

[0014] The waste heat boiler communicates with the air heater through a connecting pipeline. A flue gas and air valve is arranged on the connecting pipeline. The air outlet of the second air blower communicates with the air heater. The air heater is connected to the bag filter. The bag filter communicates with the output port of the induced draft fan. The input port of the induced draft fan communicates with the output port of the desulfurization tower. The input port of the desulfurization tower communicates with the output port of the chimney. A No. 2 zipper conveyor is arranged at the bottom of the bag filter. A screw conveyor is arranged at the bottom of the waste heat boiler. Both the No. 2 zipper conveyor and the screw conveyor are connected to the No. 3 zipper conveyor.

[0015] Further, the low-temperature power generation module includes a hot water circulation pump, a No. 1 evaporator, a No. 1 expander, a No. 1 generator, a No. 1 regenerator, a No. 1 air cooler and a No. 1 working fluid pump;

[0016] The drum cooler is connected to the water outlet of the hot water circulation pump. The water inlet of the hot water circulation pump is connected to the No. 1 evaporator. The No. 1 evaporator is connected to the No. 1 expander. The No. 1 expander is connected to the No. 1 regenerator and the No. 1 generator. The No. 1 regenerator is connected to the No. 1 air cooler and the No. 1 working fluid pump.

[0017] Furthermore, the high-temperature power generation module includes a heat-conducting oil pump, a 2# evaporator, a 2# expander, a 2# generator, a 2# regenerator, a 2# air cooler, and a 2# working fluid pump;

[0018] The waste heat boiler is connected to the oil outlet of the heat-conducting oil pump, the oil inlet of the heat-conducting oil pump is connected to the 2# evaporator, the 2# evaporator is connected to the 2# expander, the 2# expander is connected to the 2# generator and the 2# regenerator, and the 2# regenerator is connected to the 2# air cooler and the 2# working fluid pump.

[0019] Compared with the prior art, the beneficial effects achieved by the present utility model are as follows:

[0020] In addition to recycling iron and steel dust sludge, the present utility model also considers the waste heat recovery in this process, with better economic benefits; and high-temperature and low-temperature waste heat power generation systems are adopted for waste heat of different qualities to recover waste heat in a cascaded manner; at the same time, considering the large amount of dust in the flue gas at the kiln tail and the strong adhesiveness of the dust, a heat-conducting oil waste heat boiler is set, and the layout form of the waste heat boiler is horizontal. The front part of the boiler adopts a radiation heat transfer surface to minimize the ash deposition on the heat transfer surface of the boiler; for the high-temperature waste heat at the kiln tail, an organic working fluid power generation system is adopted, and the power generation efficiency of the system is high. Description of the Drawings

[0021] The drawings are used to provide a further understanding of the present utility model and constitute a part of the specification. They are used together with the embodiments of the present utility model to explain the present utility model and do not constitute a limitation to the present utility model. In the drawings:

[0022] Figure 1 is a flow chart of a waste heat recovery power generation system for disposing of iron and steel dust sludge using a rotary kiln according to the present utility model;

[0023] In the figure: 1, the first air blower; 2, the induced draft fan; 3, the coal throwing gun; 4, the kiln head dust collector; 5, the roller cooler; 6, the air cooler; 7, the kiln head hood; 8, the rotary kiln; 9, the kiln tail feed inlet; 10, the kiln tail smoke chamber; 11, the gravity settling chamber; 12, the 1# drag conveyor; 13, the waste heat boiler; 14, the flue gas valve; 15, the second air blower; 16, the air heater; 17, the bag filter; 18, the induced draft fan; 19, the desulfurization tower; 20, the chimney; 21, the 2# drag conveyor; 22, the 3# drag conveyor; 23, the screw conveyor; 24, the hot water circulation pump; 25, the 1# evaporator; 26, the 1# expander; 27, the 1# generator; 28, the 1# regenerator; 29, the 1# air cooler; 30, the 1# working fluid pump; 31, the heat-conducting oil pump; 32, the 2# evaporator; 33, the 2# expander; 34, the 2# generator; 35, the 2# regenerator; 36, the 2# air cooler; 37, the 2# working fluid pump;

[0024] Appendix of the specificationFigure 1 In which: A: Mixed materials; B: Pulverized coal; C: Pellet drying system; D: To the slag storage bin; E: Atmosphere; F: Secondary zinc oxide storage bin; G: Filter mud drying system. Specific embodiments

[0025] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0026] Please refer to Figure 1 , the present invention provides a technical solution: A waste heat recovery power generation system for disposing of iron and steel dust sludge by using a rotary kiln, including an iron and steel dust sludge treatment module, a flue gas treatment waste heat recovery module, a low-temperature power generation module, and a high-temperature power generation module.

[0027] The iron and steel dust sludge treatment module includes a rotary kiln 8, a coal injection gun 3, an induced draft fan 18, a kiln tail smoke chamber 10, and a gravity settling chamber 11. The rotary kiln 8 is used for reducing and roasting the mixed materials containing iron dust to form slag. The coal injection gun 3 is used for blowing pulverized coal into the rotary kiln 8 for combustion to heat the mixed materials. The induced draft fan 18 is used for sending the flue gas generated during the combustion of pulverized coal from the kiln tail smoke chamber 10 into the gravity settling chamber 11.

[0028] The flue gas treatment waste heat recovery module includes a drum cooler 5 and a waste heat boiler 13. The drum cooler 5 is used for exchanging heat between the slag and circulating cooling water, and the heat-exchanged circulating cooling water is supplied to the low-temperature power generation module for use.

[0029] The waste heat boiler 13 is used for receiving the flue gas conveyed by the gravity settling chamber 11 and exchanging heat between the flue gas and heat transfer oil. The heat-exchanged heat transfer oil is supplied to the high-temperature power generation module for use.

[0030] The low-temperature power generation module uses the heat obtained by exchanging heat with the circulating cooling water to heat the organic working medium, and conveys the cooled circulating cooling water back into the drum cooler 5.

[0031] The high-temperature power generation module uses the heat obtained by exchanging heat with the heat transfer oil to heat the organic working medium, and conveys the cooled heat transfer oil back into the waste heat boiler 13.

[0032] The steel dust and sludge treatment module includes a first blower 1 and a kiln head hood 7. The air outlet of the first blower 1 is connected to the air inlet of the coal throwing gun 3. The discharge port of the coal throwing gun 3 is connected to the kiln head hood 7. The kiln head hood 7 is arranged at the end of the rotary kiln 8. It also includes a kiln tail feed inlet 9, a kiln tail smoke chamber 10 and a No. 1 drag conveyor 12. The kiln tail feed inlet 9 passes through the kiln tail smoke chamber 10 and is connected to the rotary kiln 8. The kiln tail feed inlet 9 is used to convey the mixed material into the rotary kiln 8. The kiln tail smoke chamber 10 communicates with the gravity settling chamber 11. The bottom of the gravity settling chamber 11 is provided with a No. 1 drag conveyor 12. The No. 1 drag conveyor 12 is used to return the settled material to the kiln tail feed inlet 9. It also includes a suction fan 2, a kiln head dust collector 4 and an air cooler 6. The suction fan 2 is connected to the kiln head dust collector 4. The kiln head dust collector 4 is connected to the air cooler 6. The air cooler 6 is connected to the kiln head hood 7.

[0033] Working process of the steel dust and sludge treatment unit:

[0034] All kinds of iron-containing dust and sludge transported from steel enterprises are subjected to processes such as receiving, storing, drying, batching and mixing to obtain a mixed material with relatively uniform physical properties. The mixed material is transported to the kiln tail feed inlet 9 through the feeding system and flows into the tail of the rotary kiln 8 through the feeding chute. Due to the slope and rotation of the rotary kiln cylinder, the material in the kiln tumbles circumferentially and moves axially from the kiln tail to the kiln head. During the forward flow of the material in the rotary kiln, it successively passes through the preheating stage, drying stage, heating stage, and reduction roasting stage at 1050 - 1150 °C. The mixed material forms kiln slag after reduction roasting. The kiln slag enters the rotary cooler 5 through the chute. The material rotates with the cylinder in the cooling cylinder, moves from the feeding end to the discharging end and then enters the kiln slag storage bin D for storage. Zinc in the iron-containing dust mainly exists in the forms of Zn, ZnO and ZnCO3, etc. When the temperature in the front section of the rotary kiln reaches 1000 °C, ZnCO3 decomposes into ZnO. With the increase of temperature and the forward movement of the mixed material, under the reducing atmosphere, zinc oxide is reduced to zinc vapor and then enters the gas. In the rear section of the rotary kiln and the oxidation chamber, zinc vapor reacts with oxygen in the air to be oxidized into ZnO. Other heavy metals in the iron-containing material volatilize and oxidize to form metal oxides in the same principle as zinc, and the mixed oxides are secondary zinc oxide, which enters the subsequent system along with the flue gas.

[0035] The blower 1 blows pulverized coal A into the kiln through the coal throwing gun 3 for combustion to heat the mixed materials. The generated flue gas flows in the opposite direction to the materials, enabling the materials and the flue gas to fully contact and undergo heat exchange. The materials are preheated, and the flue gas enters the gravity settling chamber 11 from the kiln tail smoke chamber 10 under the action of the induced draft fan 18. The large particulate dust in the flue gas settles in the gravity settling chamber 11 and is returned to the feeding port 9 at the kiln tail of the rotary kiln through the 1# drag conveyor 12 for continuous roasting in the rotary kiln. The zinc-containing flue gas after settling enters the waste heat boiler 13 from the tail of the gravity settling chamber 11.

[0036] The function of the induced draft fan 2 is to keep the kiln head and the kiln tail in a slightly negative pressure state to ensure that there is no overflow of hot flue gas and dust during the operation of the rotary kiln. The flue gas extracted from the kiln head is cooled by the air cooler 6 and then mixed with the flue gas extracted from the kiln tail, and then passes through the kiln head dust collector 4 for dust removal and is sent to the pellet drying system for drying.

[0037] The function of setting the gravity settling chamber 11 is to let the large particulate dust in the flue gas settle first, collect a part of the dust, minimize the amount of dust entering the boiler as much as possible, and reduce the ash accumulation on the heat exchange surface of the boiler.

[0038] The flue gas treatment and waste heat recovery system includes a rotary cooler 5; a waste heat boiler 13; a flue gas and air valve 14; a blower 2 15; an air heater 16; a bag filter 17; an induced draft fan 18; a desulfurization tower 19; a chimney 20; a 2# drag conveyor 21; a 3# drag conveyor 22; a screw conveyor 23; the waste heat boiler 13 is connected to the air heater 16 through a connecting pipe, the flue gas and air valve 14 is provided on the connecting pipe, the air outlet of the blower 2 15 is connected to the air heater 16, the air heater 16 is connected to the bag filter 17, the bag filter 17 is connected to the output port of the induced draft fan 18, the input port of the induced draft fan 18 is connected to the output port of the desulfurization tower 19, the input port of the desulfurization tower 19 is connected to the output port of the chimney 20, the 2# drag conveyor 21 is arranged at the bottom of the bag filter 17, the screw conveyor 23 is arranged at the bottom of the waste heat boiler 13, and both the 2# drag conveyor 21 and the screw conveyor 23 are connected to the 3# drag conveyor 22.

[0039] The working process of the flue gas treatment and waste heat recovery unit:

[0040] The kiln slag enters the rotary cooler 5 for heat exchange with the circulating cooling water, and the outlet water temperature is about 95°C. The cooled cooling water is directly supplied to the low-temperature power generation system for use;

[0041] The flue gas at the tail of the kiln enters the waste heat boiler 13 from the tail of the gravity settling chamber 11, exchanges heat with the heat-conducting oil, heats the heat-conducting oil to about 300 °C, and the heat-conducting oil after heat exchange is directly supplied to the high-temperature power generation system. The flue gas is cooled to 300 - 350 °C after heat exchange in the waste heat boiler 13, then enters the air heater 16 through the flue gas and air valve 14 to further release heat and cool down to 170 - 180 °C, then enters the bag filter 17 for dust removal and the desulfurization tower 19 for desulfurization in sequence, and finally is discharged into the atmosphere E through the chimney 20.

[0042] The air heater 16 absorbs the heat of the flue gas and heats the air to about 250 °C. The heated air is sent to the OG filter press mud drying process. The air heater 16 adopts a double-travel two-channel structure. The high-temperature side tube group and the plug-in material are made of 1Cr18Ni9Ti; the low-temperature tube group material is 20g aluminized treatment.

[0043] The dust collected by the ash hopper at the bottom of the air heater 16, the dust removed by the bag filter 17, and the soot removed by the 2# bucket elevator 21 and the waste heat boiler 13 are collected by the ash hopper arranged at the lower part of the boiler and then converge together through the screw conveyor 23, and are sent to the secondary zinc oxide storage bin F for storage through the 3# bucket elevator 22.

[0044] The low-temperature power generation module includes a hot water circulation pump 24, a 1# evaporator 25, a 1# expander 26, a 1# generator 27, a 1# regenerator 28, a 1# air cooler 29 and a 1# working fluid pump 30; the drum cooler 5 is connected to the outlet of the hot water circulation pump 24, the inlet of the hot water circulation pump 24 is connected to the 1# evaporator 25, the 1# evaporator 25 is connected to the 1# expander 26, the 1# expander 26 is connected to the 1# regenerator 28 and the 1# generator 27, and the 1# regenerator 28 is connected to the 1# air cooler 29 and the 1# working fluid pump 30.

[0045] The working process of the low-temperature power generation system:

[0046] The hot water of about 95 °C coming out of the drum cooler 5 enters the 1# evaporator 25 to heat the organic working fluid R245fa, and after cooling down to about 70 °C, it is sent back to the drum cooler 5 through the hot water circulation pump 24 to continue cooling the kiln slag for recycling;

[0047] The organic working fluid R245fa is heated into steam in the 1# evaporator 25, and then enters the 1# expander 26 to do work to drive the 1# generator 27 to generate electricity;

[0048] The exhausted steam organic working fluid discharged by the 1# expander 26 enters the 1# regenerator 28 to release heat, then enters the 1# air cooler 29 to be cooled and condensed into the liquid organic working fluid R245fa, and then is sent into the 1# regenerator 28 to absorb heat through the 1# working fluid pump 30, and then enters the 1# evaporator 25 for recycling.

[0049] The high-temperature power generation module includes a heat-conducting oil pump 31, a No. 2 evaporator 32, a No. 2 expander 33, a No. 2 generator 34, a No. 2 regenerator 35, a No. 2 air cooler 36, and a No. 2 working fluid pump 37; the waste heat boiler 13 is connected to the oil outlet of the heat-conducting oil pump 31, the oil inlet of the heat-conducting oil pump 31 is connected to the No. 2 evaporator 32, the No. 2 evaporator 32 is connected to the No. 2 expander 33, the No. 2 expander 33 is connected to the No. 2 generator 34 and the No. 2 regenerator 35, and the No. 2 regenerator 35 is connected to the No. 2 air cooler 36 and the No. 2 working fluid pump 37.

[0050] Working process of the high-temperature power generation module:

[0051] The heat-conducting oil at about 300 °C from the waste heat boiler 13 enters the No. 2 evaporator 32 to heat the organic working fluid cyclopentane, and after the temperature drops to 120 - 150 °C, it is sent back to the waste heat boiler 13 through the heat-conducting oil pump 31 for continuous flue gas circulation utilization;

[0052] The organic working fluid cyclopentane is heated into steam in the No. 2 evaporator 32, and then enters the No. 2 expander 33 to do work to drive the No. 2 generator 34 to generate electricity;

[0053] The exhausted steam cyclopentane discharged from the No. 2 expander 33 enters the No. 2 regenerator 35 to release heat, then enters the No. 2 air cooler 36 to be cooled and condensed into liquid organic working fluid cyclopentane, and then is sent into the No. 2 regenerator 35 to absorb heat through the No. 2 working fluid pump 37, and then enters the No. 2 evaporator 32 for recycling;

[0054] Since the flue gas discharged from the kiln tail smoke chamber 10 has a large dust content and the dust has extremely strong adhesiveness, in order to reduce the ash fouling on the boiler heat transfer surface, a radiation heat transfer surface is required at the front of the boiler. The radiation heat transfer surface can only be an evaporative heating surface. If superheated steam is to be generated, the superheater can only be arranged behind the radiation heat transfer surface, but the flue gas temperature has already decreased after passing through the radiation heat transfer surface. Therefore, if steam is generated, only saturated steam or slightly superheated steam can be generated, and the efficiency of the entire power generation system is relatively low.

[0055] However, in this solution, a heat-conducting oil waste heat boiler is adopted. The radiation heat transfer surface can heat the liquid heat-conducting oil to 300 °C, and then enter the high-temperature organic working fluid power generation cycle system. The power generation efficiency of the organic working fluid power generation cycle system is higher than that of the saturated steam or slightly superheated steam power generation system, and the power generation amount can be increased by 10 - 15%.

[0056] This solution sets up two power generation systems, namely a low-temperature power generation system and a high-temperature power generation system, to fully recover and utilize the low-temperature waste heat and high-temperature waste heat in the steel dust sludge treatment process, with a high waste heat resource utilization rate.

[0057] Both the low-temperature power generation system and the high-temperature power generation system adopt organic working fluid power generation systems, without consuming water resources and having high environmental protection benefits.

[0058] Finally, it should be noted that the above are only the preferred embodiments of the present utility model and are not used to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A waste heat recovery power generation system for disposing of steel dust and sludge by using a rotary kiln, characterized in that: It includes a steel dust and sludge treatment module, a flue gas treatment and waste heat recovery module, a low-temperature power generation module, and a high-temperature power generation module; The steel dust and sludge treatment module includes a rotary kiln (8), a coal injection gun (3), an induced draft fan (18), a kiln tail smoke chamber (10), and a gravity settling chamber (11). The rotary kiln (8) is used to reductively roast the mixed material containing iron dust to form kiln slag. The coal injection gun (3) is used to blow pulverized coal into the rotary kiln (8) for combustion to heat the mixed material. The induced draft fan (18) is used to send the flue gas generated during the combustion of pulverized coal from the kiln tail smoke chamber (10) into the gravity settling chamber (11); The flue gas treatment and waste heat recovery module includes a drum cooler (5) and a waste heat boiler (13). The drum cooler (5) is used to conduct heat exchange between the kiln slag and circulating cooling water, and the heat-exchanged circulating cooling water is supplied to the low-temperature power generation module for use; The waste heat boiler (13) is used to receive the flue gas conveyed by the gravity settling chamber (11), and conduct heat exchange between the flue gas and heat-conducting oil. The heat-exchanged heat-conducting oil is supplied to the high-temperature power generation module for use; The low-temperature power generation module uses the heat obtained from heat exchange with the circulating cooling water to heat the organic working medium, and conveys the cooled circulating cooling water back into the drum cooler (5); The high-temperature power generation module uses the heat obtained from heat exchange with the heat-conducting oil to heat the organic working medium, and conveys the cooled heat-conducting oil back into the waste heat boiler (13).

2. The waste heat recovery power generation system for disposing of steel dust sludge by using a rotary kiln according to claim 1, wherein: The steel dust and sludge treatment module includes a first air blower (1) and a kiln head hood (7). The air outlet of the first air blower (1) is connected to the air inlet of the coal injection gun (3), the material outlet of the coal injection gun (3) is connected to the kiln head hood (7), and the kiln head hood (7) is arranged at the end of the rotary kiln (8).

3. The waste heat recovery power generation system for disposing of steel dust sludge by using a rotary kiln according to claim 1, wherein: The steel dust and sludge treatment module further includes a kiln tail feeding port (9), a kiln tail smoke chamber (10), and a No. 1 drag conveyor (12). The kiln tail feeding port (9) penetrates through the kiln tail smoke chamber (10) and is connected to the rotary kiln (8). The kiln tail feeding port (9) is used to convey the mixed material into the rotary kiln (8). The kiln tail smoke chamber (10) communicates with the gravity settling chamber (11). The bottom of the gravity settling chamber (11) is provided with a No. 1 drag conveyor (12), and the No. 1 drag conveyor (12) is used to return the settled material to the kiln tail feeding port (9).

4. A waste heat recovery power generation system for disposing of steel dust and sludge using a rotary kiln according to claim 2, characterized in that: The steel dust and sludge treatment module further includes an induced draft fan (2), a kiln head dust collector (4), and an air cooler (6). The induced draft fan (2) is connected to the kiln head dust collector (4), the kiln head dust collector (4) is connected to the air cooler (6), and the air cooler (6) is connected to the kiln head hood (7).

5. A waste heat recovery power generation system for disposing of steel dust and sludge by using a rotary kiln according to claim 1, characterized in that: The flue gas treatment and waste heat recovery module further includes a waste heat boiler (13), a flue gas and air valve (14), a second air blower (15), an air heater (16), a bag filter (17), an induced draft fan (18), a desulfurization tower (19), a chimney (20), a No. 2 drag conveyor (21), a No. 3 drag conveyor (22), and a screw conveyor (23); The waste heat boiler (13) communicates with the air heater (16) through a connecting pipeline. A flue gas and air valve (14) is provided on the connecting pipeline. The air outlet of the second air blower (15) communicates with the air heater (16). The air heater (16) is connected to the bag filter (17). The bag filter (17) communicates with the outlet of the induced draft fan (18). The inlet of the induced draft fan (18) communicates with the outlet of the desulfurization tower (19). The inlet of the desulfurization tower (19) communicates with the outlet of the chimney (20). A No. 2 drag conveyor (21) is provided at the bottom of the bag filter (17). A screw conveyor (23) is provided at the bottom of the waste heat boiler (13). Both the No. 2 drag conveyor (21) and the screw conveyor (23) are connected to the No. 3 drag conveyor (22).

6. The waste heat recovery power generation system for disposing of steel dust and sludge by using a rotary kiln according to claim 1, characterized in that: The low-temperature power generation module includes a hot water circulation pump (24), a No. 1 evaporator (25), a No. 1 expander (26), a No. 1 generator (27), a No. 1 regenerator (28), a No. 1 air cooler (29), and a No. 1 working fluid pump (30); The drum cooler (5) is connected to the water outlet of the hot water circulation pump (24). The water inlet of the hot water circulation pump (24) is connected to the No. 1 evaporator (25). The No. 1 evaporator (25) is connected to the No. 1 expander (26). The No. 1 expander (26) is connected to the No. 1 regenerator (28) and the No. 1 generator (27). The No. 1 regenerator (28) is connected to the No. 1 air cooler (29) and the No. 1 working fluid pump (30).

7. The waste heat recovery power generation system for disposing of steel dust and sludge by using a rotary kiln according to claim 1, characterized in that: The high-temperature power generation module includes a heat conduction oil pump (31), a No. 2 evaporator (32), a No. 2 expander (33), a No. 2 generator (34), a No. 2 regenerator (35), a No. 2 air cooler (36), and a No. 2 working fluid pump (37); The waste heat boiler (13) is connected to the oil outlet of the heat conduction oil pump (31). The oil inlet of the heat conduction oil pump (31) is connected to the No. 2 evaporator (32). The No. 2 evaporator (32) is connected to the No. 2 expander (33). The No. 2 expander (33) is connected to the No. 2 generator (34) and the No. 2 regenerator (35). The No. 2 regenerator (35) is connected to the No. 2 air cooler (36) and the No. 2 working fluid pump (37).

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