Design method for waste heat total recovery and zero emission system of sintering circular cooler

Abstract

The invention belongs to the technical field of energy conservation and emission reduction of sintering circular coolers, and particularly relates to a sintering circular cooler waste heat total recovery and zero emission system design method which is characterized by comprising the following steps: calculating the total mineral material amount treated by a circular cooler according to the area of the sintering machine, the utilization coefficient of the sintering machine and the total material returning coefficient of the sintering machine; the reasonable cooling air quantity and air temperature of each section are calculated according to the ore material quantity and temperature of the circular cooler, and the cooling and heating requirements are met; the yield of hot water and steam is calculated according to the smoke air volume and the smoke air temperature of each section, so that the smoke waste heat amount is balanced with the heat of the steam and the hot water; the smoke hood is a partition hood, five relatively isolated spaces are formed among the five sections through the partition hood, and air channeling among the sections is prevented; the steam turbine generator unit is a steam supplementing and condensing type steam turbine generator unit. The system has the advantages that starting from a mineral aggregate system of a heat source and a waste heat boiler, a new waste heat utilization steam and hot water circulation system is constructed by utilizing the steam supplementing and condensing steam turbine, and real zero emission is realized.

Description

Technical Field

[0001] This invention belongs to the field of energy-saving and emission-reduction technology of sintered ring coolers, and particularly relates to a design method for a waste heat recovery and zero-emission system for sintered ring coolers. Background Technology

[0002] A sintering ring cooler, also known as a sintering ring type cooler, is used to effectively cool the hot sintered ore discharged from the sintering machine. The sintering ring cooler consists of a transmission device, frame assembly, rotating body assembly, sealing device, feed hopper, discharge hopper, exhaust hood at the discharge point, discharge curved rail assembly, horizontal rail assembly, side rail assembly, support roller assembly, air box assembly, and cover assembly. The sintered cake discharged from the sintering machine is crushed by a single-tooth roller and enters the feed hopper. It is then continuously and evenly spread onto the rotary car via a feed chute. The rotary car is driven by the friction wheel of the drive unit, while a blower simultaneously sends cold air into the air box under the car. The cold air enters the hot sintered ore and exchanges heat with it, gradually cooling the sintered ore. When the trolley returns to the unloading area, its wheels begin to descend along the curved track, unloading the cooled hot sinter into the discharge hopper. The plate feeder installed under the discharge chute then transports the cold sinter to the finished product belt conveyor. After unloading, the trolley rises again along the curved track to its reset position, and the next feeding cycle begins. Generally, the cooling zone of a sintering ring cooler is divided into five sections. High-temperature sinter cakes enter from the first section and flow to the fifth section, with the temperature decreasing from high to low. Currently, the waste heat utilization of sintering ring coolers is mostly limited to the first and second sections, with a maximum power generation capacity of 21 kWh / t. A very small number utilize waste heat from the first, second, and third sections, with a maximum power generation capacity of 24 kWh / t.

[0003] Chinese utility model patent application number 202121918362.0 discloses a full-ring cooling waste heat recovery and zero-emission system for a sintering ring cooler, including a sintering ring cooler flue gas system, a high-temperature zone waste heat recovery system, a medium-temperature zone waste heat recovery system, and a low-temperature zone waste heat recovery zero-emission system. The sintering ring cooler flue gas system includes a high-temperature zone flue gas system and a medium-temperature zone flue gas system. The high-temperature zone flue gas system introduces the high-temperature zone flue gas of the sintering ring cooler into the high-temperature zone waste heat recovery system for waste heat recovery, and sends the heat-exchanged high-temperature zone return flue gas back to the high-temperature zone of the sintering ring cooler. The low-temperature zone flue gas system introduces the low-temperature zone flue gas of the sintering ring cooler into the low-temperature zone waste heat recovery system for waste heat recovery, and sends the heat-exchanged low-temperature zone return flue gas back to the low-temperature zone of the sintering ring cooler. This scheme uses two waste heat recovery boilers to recover waste heat in sections one and two, and sections three to five. However, the accompanying single-inlet condensing steam turbines result in low power generation efficiency. The boiler body lacks a hot water heat exchanger. The fifth-section flue gas is connected in parallel with the boiler to the lower part of the third section of the direct-return annular cooler, but the correct location is not provided, leading to an unbalanced airflow. The return air from the fifth section of the annular cooler is not shown; the diagram only indicates that it enters the lower part of the annular cooler after passing through a heat exchanger. Hot air is used for the fifth section's inlet, which cannot guarantee the cooling of the ore. Furthermore, the biggest problem with this system is the lack of theoretical basis for its design. It only describes the system flow, without specifying how to determine the flue gas flow rate and temperature to maintain thermal balance for ore cooling and boiler heat extraction, how to select steam parameters for high efficiency, or how to ensure the final ore cooling of the annular cooler meets standards. Moreover, this system is unsuitable for sintering annular cooler systems under all production volumes and ore temperatures, and it does not provide applicable production volumes and ore temperatures. The purpose of this patent is to solve the problem that in the actual engineering of existing sintering ring cooler waste heat utilization projects, the schemes are basically without theoretical support, the selection of waste heat boiler inlet air volume and temperature and waste heat utilization circulating fan are copied verbatim, and the waste heat recovery rate and exhaust gas emission are not rigorous enough to achieve the expected results.

[0004] In existing projects utilizing waste heat from sintering ring coolers, the solutions lack theoretical support, and the selection of ring cooler blowers is often copied verbatim. The assessment and acceptance of waste heat recovery rate and exhaust emissions are not rigorous. This results in high production costs for enterprises and is inconsistent with national energy conservation and emission reduction policies. Therefore, it is necessary to redesign the waste heat recovery system for sintering ring coolers to ensure that waste heat recovery, ore cooling, and revenue indicators all achieve the expected results after project implementation. Summary of the Invention

[0005] The purpose of this invention is to provide a design method and application system for full recovery and zero emission of waste heat from a sintering ring cooler, overcoming the shortcomings of existing technologies. The ultimate goal is to achieve full recovery of waste heat and zero emission of exhaust gas. Starting from the ore system and waste heat boiler of the heat source, a new waste heat utilization steam and hot water circulation system is constructed using a supplementary steam condensing turbine to ensure that the waste heat recovery, ore cooling and revenue indicators after the project is implemented achieve the expected results.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A design method for a sintering ring cooler waste heat recovery and zero-emission system includes a ring cooler, a ring cooler blower, a waste heat boiler, a circulating fan, a steam turbine generator set, a condenser, and a condensate pump. The ring cooler is divided into five sections, each with a ring cooler blower. A fume hood is installed on the ring cooler, and the top of the fume hood is connected to the waste heat boiler via a duct. The steam outlet of the waste heat boiler is connected to the steam turbine generator set. The condensate from the steam turbine generator set is collected in the condenser and returned to the waste heat boiler via the condensate pump. The total amount of ore processed by the ring cooler is calculated based on the sintering machine area, sintering machine utilization coefficient, and sintering machine total return coefficient. The heat of the ore and the heat of the flue gas in each section are balanced based on the ore quantity and temperature of the ring cooler, simultaneously meeting cooling and heat extraction needs. The output of hot water and steam is calculated based on the flue gas volume and temperature of each section, ensuring the balance of heat from the flue gas and the output of steam and hot water. Heat balance; the fume hood is a partition hood, forming five relatively isolated spaces between the five sections to prevent air leakage between sections. Isolation valves are installed at the bottom connecting pipes of each section, and the material layer in each section is independently cooled by an annular cooling blower located below that section; the steam turbine generator set is a supplementary steam condensing steam turbine generator set; the waste heat boiler is a combination of two sets of waste heat boilers, the specifications and installation positions of which are selected and matched according to the utilization coefficient of the sintering machine. High-parameter saturated steam produced by the low-temperature zone waste heat boiler is sent to the superheater of the high-temperature zone waste heat boiler, and high-parameter saturated steam produced by the low-temperature zone waste heat boiler is sent to the high-temperature zone waste heat boiler for superheating, enabling cascaded energy utilization; the outlets of the two sets of high-parameter steam are connected to the main steam inlet of the supplementary steam condensing steam turbine generator set, and the outlets of the two sets of low-parameter steam are connected to the supplementary steam inlet of the supplementary steam condensing steam turbine generator set.

[0007] Furthermore, the partition cover structure includes a top cover, partition plates, and a movable plate. The lower surface of the top cover is sealed to the upper ends of the two partition plates respectively. The lower ends of the partition plates are connected to the upper ends of the movable plate by hinges. The lower end of the movable plate overlaps the surface of the ore on the annular cooler. The top cover, partition plates, movable plate, and ore form a relatively sealed space.

[0008] Furthermore, in the two sets of waste heat boilers, the steam parameters of the first waste heat boiler are as follows: high parameter steam pressure 1.7±0.2MPa, steam temperature 360±20℃; low parameter steam pressure 0.45±0.2MPa, steam temperature 200±20℃; the parameters of the second waste heat boiler are as follows: high parameter steam pressure 1.8MPa saturated steam; low parameter steam pressure 0.45±0.2MPa, steam temperature 200±20℃.

[0009] Furthermore, the formula for calculating the total amount of ore processed by the ring cooler is: M = F × 1× 2; Where: M is the total amount of ore, in t / h; F is the area of ​​the sintering machine in m². 2 ; 1 represents the utilization factor of the sintering machine. 2 represents the total return coefficient of sintering.

[0010] Furthermore, the formula for calculating the balance between the ore heat and the flue gas heat is: Q = C × m × Δt; where C1 × m1 × Δt1 = C2 × m2 × Δt2; where: C1 is the specific heat of the ore; m1 is the mass of the ore; Δt1 is the temperature difference of the ore; C2 is the specific heat of the flue gas; M2 is the flue gas flow rate; and Δt2 is the temperature difference between the flue gas and the flue gas.

[0011] Furthermore, the formula for calculating the heat balance of flue gas heat and steam / hot water is: Q=C×m×Δt=Δh×m×Δt, where C2×m2×Δt2=Δh3×m3×Δt3+Δh3'×m3'×Δt3'; where: C2 is the specific heat of flue gas, M2 is the mass of flue gas, Δt2 is the temperature difference between flue gas and hot water; Δh3 is the enthalpy difference between steam and water, M3 is the flow rate of hot water, Δt3 is the temperature difference of hot water; Δh3' is the enthalpy difference of hot water, M3' is the flow rate of hot water, and Δt3' is the temperature difference of hot water.

[0012] The working principle of this invention is as follows: This invention addresses the significant differences in sintering waste heat generation in sintering annular cooling systems with varying ore compositions, fuel compositions, and operating modes. By employing scientifically reasonable parameter values ​​and calculating the heat balance between ore and flue gas, and between flue gas and steam / water, the principle is to maximize heat extraction while ensuring ore cooling. The waste heat utilization parameters for the sintering annular cooling system are rationally categorized according to sintering output, utilization coefficient, and ore dropping temperature within different ranges. This invention adds hot water extraction in stages three, four, and five, maximizing waste heat utilization while ensuring the cooling effect of the annular cooler. The flue gas from stage five of the annular cooler, after waste heat utilization in the heat exchanger, is sent back to the sintering production process for reuse, with no external emissions. This stage cannot use recirculated hot air return to ensure cooling effect; if hot air from stage five is sent to other stages, airflow balance must be achieved, which is crucial for zero emissions. Compared with the prior art, the beneficial effects of the present invention are: 1) This invention aims to achieve full recovery of waste heat and zero emissions of waste gas. It starts with the combined application of the heat source mineral system and waste heat boiler, and uses a supplementary steam condensing steam turbine to build a new waste heat utilization steam and hot water circulation system to utilize waste heat. This ensures that the waste heat recovery, mineral cooling and revenue indicators after the project is implemented will achieve the expected results, while achieving zero emissions of waste gas from the annular cooler. 2) The present invention provides a complete recovery of waste heat from the annular cooler. The waste heat from the first, second, third, and fourth sections can all be used for waste heat power generation, with a power generation index of 26kWh / t-30kWh / t. At the same time, it also adds hot water heat extraction from the third, fourth, and fifth sections, which far exceeds the existing waste heat utilization index. 3) This invention is applicable to both new and renovation projects. New projects should refer to the operating data of existing projects, while renovation projects should combine the operating data before the renovation. The optimized process flow of the system can better realize the multi-level and cascade utilization of energy, and solve the balance between the changes in sintering ore type and the fluctuation of sintering processing volume and the waste heat recovery and flue gas treatment system, thereby achieving true "full recovery of waste heat from the annular cooler and zero emissions". Attached Figure Description

[0013] Figure 1 This is a schematic diagram illustrating the flue gas and air balance between the annular cooler, waste heat boiler, and steam turbine generator set in an embodiment of the present invention. Figure 2 This is a schematic diagram of the application system according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the partition cover structure in an embodiment of the present invention; In the diagram: 1-Ring cooler section 1, 2-Ring cooler section 2, 3-Ring cooler section 3, 4-Ring cooler section 4, 5-Ring cooler section 5, 6-Isolation cover, 7-Ring cooler blower #1, 8-Ring cooler blower #2, 9-Ring cooler blower #3, 10-Ring cooler blower #4, 11-Ring cooler blower #5, 12-First waste heat boiler, 13-Second waste heat boiler, 14-Supplementary steam condensing turbine generator set, 15-Condenser, 16-Condensate pump, 17-Heat exchanger, 18-Top cover, 19-Partition plate, 20-Modible plate, 21-Hinge, 22-First circulating fan, 23-Second circulating fan, 24-Isolation valve. Detailed Implementation

[0014] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0015] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0016] The components of the embodiments of the invention described and shown in the accompanying drawings can typically be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention.

[0017] See Figure 1-3 This is a schematic diagram illustrating the flue gas and air balance between the annular cooler, waste heat boiler, and steam turbine generator set, as part of an embodiment of the design method for a sintering annular cooler waste heat recovery and zero-emission system according to the present invention. In a conventional annular cooler system comprising an annular cooler, an annular cooler blower, a waste heat boiler, a steam turbine generator set, a condenser 15, and a condensate pump 16, the annular cooler is divided into five sections: Section 1 (annular cooler), Section 2 (annular cooler), Section 3 (annular cooler), Section 4 (annular cooler), and Section 5 (annular cooler). Each section... Each section is equipped with an annular cooling blower, namely #1 annular cooling blower 7, #2 annular cooling blower 8, #3 annular cooling blower 9, #4 annular cooling blower 10, and #5 annular cooling blower 11. Each annular cooler is equipped with a fume hood, the top of which is connected to a waste heat boiler via a duct. The steam output from the waste heat boiler is connected to a steam turbine generator set 14, which is a supplementary steam condensing steam turbine generator set. The condensate from the turbine generator set is collected in a condenser 15 and returned to the waste heat boiler via a condensate pump. The fume hood is a partition hood 6, forming five relatively isolated spaces between the five sections to prevent cross-flow of air between sections. Each section has a disconnect valve 24 at its bottom connecting pipe. Each section's material layer is independently cooled by the annular cooling blower below it, creating a synergistic cooling effect between the upper and lower sections. The partition cover 6 structure includes a top cover 18, partition plates 19, and movable plates 20. The lower surface of the top cover is sealed to the upper ends of the two partition plates 19 respectively. The lower ends of the partition plates 19 are connected to the upper ends of the movable plates 20 by hinges 21. The lower end of the movable plates 20 overlaps the surface of the ore on the ring cooler. The top cover 18, partition plates 19, movable plates 20 and the ore form a relatively sealed space, which effectively prevents air leakage between sections and heat loss.

[0018] This invention calculates the total amount of ore processed by the annular cooler based on the sintering machine area, sintering machine utilization coefficient, and sintering machine total return coefficient; it calculates the balance between ore heat and flue gas heat in each section based on the ore amount and temperature in the annular cooler, and determines the flue gas volume and temperature to simultaneously meet cooling and heat extraction needs; it calculates the output of hot water and steam based on the flue gas volume and temperature in each section to balance the heat of flue gas with the heat of steam and hot water.

[0019] In the application system embodiment of the present invention, the sintering machine with the system has a utilization coefficient of ≥1.35, a feed temperature of 850 > t > 700℃ for the annular cooler, a flue gas temperature of ≥420℃ for the first stage of the annular cooler, a flue gas temperature of ≥280℃ for the third stage of the annular cooler, and a waste heat boiler consisting of two sets of bottom-mounted dual-pressure waste heat boilers. The first waste heat boiler 12 is a first- and second-stage waste heat boiler, with flue gas taken from the first and second stages. The exhaust air from the bottom of the first- and second-stage waste heat boilers is returned to the first and second stages via the first circulating fan 22. The second waste heat boiler 13 is a dual-pressure waste heat boiler, which is a three- or four-stage waste heat boiler. The flue gas is taken from the third and fourth stages, and the exhaust air from the bottom of the third and fourth stage waste heat boilers is returned to the third and fourth stages via the second circulating fan 23. The specifications and installation location of the waste heat boilers are selected and matched according to the utilization coefficient of the sintering machine. The high-parameter saturated steam produced by the low-temperature zone waste heat boiler is sent to the superheater of the high-temperature zone waste heat boiler, and the high-parameter saturated steam produced by the low-temperature zone waste heat boiler is sent to the high-temperature zone waste heat boiler for superheating, so as to make energy use in a cascade manner. The two sets of high-parameter steam outlets are connected to the main steam port of the supplementary steam condensing turbine generator set, and the two sets of low-parameter steam outlets are connected to the supplementary steam inlet of the supplementary steam condensing turbine generator set. The lower-parameter steam produced by waste heat recovery can be used for external pipeline heating, and the hot water produced by waste heat recovery can be used for heating the sintering process mixture, winter heating, seawater desalination and other processes.

[0020] The high-parameter steam from the dual-pressure waste heat boiler ensures power generation efficiency, while the low-parameter steam ensures heat extraction and reduces flue gas temperature. The return air from the annular cooler ensures cooling of the ore in the annular cooler. Excessively high high-parameter steam pressure reduces evaporation, while excessively low pressure reduces turbine power generation efficiency. The steam temperature must be set reasonably based on the upper limit of flue gas temperature; too high a value will not guarantee a reasonable steam temperature under low load conditions, while too low a value will reduce the power generation efficiency of waste heat utilization. Calculations yielded the optimal parameter values ​​for this type of sintering annular cooler waste heat project. Specifically: for the first and second stage waste heat boilers (first waste heat boiler 12), the steam values ​​are: high-parameter steam pressure 1.7±0.2MPa, steam temperature 360±20℃; low-parameter steam pressure 0.45±0.2MPa, steam temperature 200±20℃. For the third and fourth stage waste heat boilers (second waste heat boiler 13), the values ​​are: high-parameter steam pressure 1.8MPa saturated steam; low-parameter steam pressure 0.45±0.2MPa, steam temperature 200±20℃.

[0021] This invention embodiment relies on the heat balance between flue gas waste heat and the heat from steam and hot water. The appropriate values ​​of steam parameters are crucial to the efficiency of sintering waste heat power generation. Furthermore, if hot water is used at the tail end of the waste heat boiler in the low-temperature section of the annular cooler, the exhaust gas temperature at the boiler tail end can be reduced, which is highly beneficial for waste heat extraction and cooling of the ore in the annular cooler. Based on the flue gas volume and temperature of each section, heat is transferred to hot water and steam through the waste heat boiler to achieve heat balance, and the output of steam and hot water is calculated. The specific calculation process is as follows: The formula for calculating the total amount of ore processed by the annular cooler is: M = F × 1× 2 (Formula 1); In the formula: M is the total amount of ore, in t / h; F is the area of ​​the sintering machine in m². 2 ; 1 represents the utilization factor of the sintering machine. 2 represents the total return coefficient of sintering.

[0022] Based on the feed temperature T of the annular cooler, and considering the different ore and fuel compositions of the sintering waste heat, new projects should refer to the operating data of existing projects, while renovation projects should combine the operating data before the renovation to determine the feed temperature of the annular cooler. With the quantity and temperature of the ore as the heat source for sintering waste heat, the heat capacity of the heat source can be calculated. A waste heat extraction scheme should then be designed based on the ore production and temperature conditions of the heat source.

[0023] The formula for calculating the heat balance between ore and flue gas is: Q = C × m × Δt (Formula 2); Where C1×m1×Δt1=C2×m2×Δt2 (Formula 3); In the formula: C1 is the specific heat of the ore; m1 is the mass of the ore; Δt1 is the temperature difference of the ore; C2 is the specific heat of the flue gas; M2 is the flow rate of the flue gas; Δt2 is the temperature difference of the flue gas.

[0024] Based on the amount and temperature of the ore in the annular cooler, the flue gas volume and temperature of each section of the annular cooler are determined to achieve heat balance. As the intermediate carrier for waste heat utilization, the flue gas volume and temperature are crucial for ensuring ore cooling and waste heat output. Flue gas volume and temperature are relevant parameters; selecting a temperature close to the actual conditions and designing a reasonable air volume are essential to guarantee normal heat exchange.

[0025] The formula for calculating the heat balance of flue gas heat and steam / hot water is: Q = C × m × Δt (Formula 4); Where C2×m2×Δt2=C3×m3×Δt3 (Formula 5); In the formula: C2 is the specific heat of flue gas; M2 is the mass of flue gas; Δt2 is the temperature difference between flue gas and hot water; C3 is the specific heat of hot water; M3 is the flow rate of hot water; Δt3 is the temperature difference of hot water.

[0026] In this embodiment, zero emissions at the end of the annular cooler (fifth section) are the final guarantee for ore cooling. The final flue gas volume and temperature are calculated by balancing the ore heat, flue gas heat, hot water heat, and flue gas volume. The flue gas is then sent to the sintering hot air ignition and flue gas circulation system to fully recover the waste heat from the annular cooler. As a final guarantee, the flue gas can be sent to the dust collector at the tail of the sintering machine, ensuring that the annular cooler does not emit any external emissions while the ore is cooled. The highest point of the flue gas temperature in the fifth section is <160℃. The heat is absorbed by the designed hot water heat exchanger 17, and the temperature of the discharged flue gas is controlled as needed before being sent to the sintering flue gas circulation system to recover heat.

[0027] This invention establishes a theoretical design concept for the overall heat exchange balance based on fundamental principles. In this concept, parameters for each section must be objectively judged and calculated. Not all formulas can achieve balance. Only parameters that fit the actual situation can achieve successful heat exchange. This ensures that the design scheme for efficient cascade utilization of waste heat resources achieves the expected results. The system is flexible and convenient to adjust, and its operation is stable and reliable. Its performance far exceeds that of existing waste heat utilization systems on the market that use one or two-stage heat extraction and three-stage airflow to the first stage.

[0028] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A design method for a sintering annular cooler waste heat recovery and zero-emission system, comprising an annular cooler, an annular cooler blower, a waste heat boiler, a circulating fan, a steam turbine generator set, a condenser, and a condensate pump. The annular cooler is divided into five sections, each section having an annular cooler blower. A fume hood is installed on the annular cooler, the top of which is connected to the waste heat boiler via a duct. The steam outlet of the waste heat boiler is connected to the steam turbine generator set. The condensate from the steam turbine generator set is collected in the condenser and returned to the waste heat boiler via the condensate pump. The system is characterized in that... The total amount of ore processed by the annular cooler is calculated based on the sintering machine area, sintering machine utilization coefficient, and sintering machine total return coefficient. The heat of the ore and the heat of the flue gas in each section are balanced based on the amount and temperature of the ore in the annular cooler, so as to meet the cooling and heat extraction needs at the same time; the output of hot water and steam is calculated based on the amount and temperature of the flue gas in each section, so as to balance the heat of the flue gas with the heat of steam and hot water. The fume hood is a partition hood, forming five relatively isolated spaces between the five sections to prevent air leakage between sections. Each section has a disconnect valve at the bottom connecting pipe, and the material layer in each section is independently cooled by the annular cooling blower installed below the section. The steam turbine generator set is a supplementary steam condensing steam turbine generator set. The waste heat boiler is a combination of two sets of waste heat boilers. The specifications and installation positions of the waste heat boilers are selected and matched according to the utilization coefficient of the sintering machine. The high-parameter saturated steam produced by the low-temperature zone waste heat boiler is sent to the superheater of the high-temperature zone waste heat boiler. The high-parameter saturated steam produced by the low-temperature zone waste heat boiler is sent to the high-temperature zone waste heat boiler for superheating, so as to realize the cascade utilization of energy. The outlets of the two sets of high-parameter steam are connected to the main steam port of the supplementary steam condensing turbine generator set, and the outlets of the two sets of low-parameter steam are connected to the supplementary steam inlet of the supplementary steam condensing turbine generator set. The low-parameter steam and hot water are supplied to the external pipeline network for heat use.

2. The design method for a sintering ring cooler waste heat recovery and zero-emission system according to claim 1, characterized in that, The partition cover structure includes a top cover, partition plates, and a movable plate. The lower surface of the top cover is sealed to the upper ends of the two partition plates respectively. The lower ends of the partition plates are connected to the upper ends of the movable plate by hinges. The lower end of the movable plate overlaps the surface of the ore on the annular cooler. The top cover, partition plates, movable plate, and ore form a relatively sealed space.

3. The design method for a sintering ring cooler waste heat recovery and zero-emission system according to claim 1, characterized in that, In the two waste heat boilers, the steam parameters of the first waste heat boiler are as follows: high parameter steam pressure 1.7±0.2MPa, steam temperature 360±20℃; low parameter steam pressure 0.45±0.2MPa, steam temperature 200±20℃; the parameters of the second waste heat boiler are as follows: high parameter steam pressure 1.8MPa saturated steam; low parameter steam pressure 0.45±0.2MPa, steam temperature 200±20℃.

4. The design method for a sintering ring cooler waste heat recovery and zero-emission system according to claim 1, characterized in that, The formula for calculating the total amount of ore processed by the ring cooler is: M = F × 1× 2; Where: M is the total amount of ore, in t / h; F is the area of ​​the sintering machine in m2; 1 represents the utilization factor of the sintering machine. 2 represents the total return coefficient of sintering.

5. The design method for a sintering ring cooler waste heat recovery and zero-emission system according to claim 1, characterized in that, The formula for calculating the balance between the calorific value of the ore and the calorific value of the flue gas is: Q = C × m × Δt; Where C1×m1×Δt1=C2×m2×Δt2; where: C1 is the specific heat of the ore; m1 is the mass of the ore; Δt1 is the temperature difference of the ore; C2 is the specific heat of the flue gas; M2 is the flow rate of the flue gas; Δt2 is the temperature difference of the flue gas.

6. The design method for a sintering ring cooler waste heat recovery and zero-emission system according to claim 1, characterized in that, The formula for calculating the heat balance of flue gas heat and steam / hot water is: Q = C × m × Δt = Δh × m × Δt, where C2 × m2 × Δt2 = Δh3 × m3 × Δt3 + Δh3' × m3' × Δt3'; where: C2 is the specific heat of flue gas, M2 is the mass of flue gas, Δt2 is the temperature difference between flue gas and hot water; Δh3 is the enthalpy difference between steam and water, M3 is the flow rate of hot water, Δt3 is the temperature difference of hot water; Δh3' is the enthalpy difference of hot water, M3' is the flow rate of hot water, and Δt3' is the temperature difference of hot water.

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