Roller kiln double-heat-source waste heat recovery Kalina cycle power generation system and power generation method
By installing a superheater between the separator and the turbine in the Kalina circulation system, the problem of waste heat recovery from dual heat sources is solved by utilizing the high-temperature flue gas at the kiln head and the cooling exhaust gas at the kiln tail, thus achieving high power generation efficiency and energy utilization.
Patent Information
- Application Number
- CN202311222225.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-09-20
- Publication Date
- 2026-02-03
AI Technical Summary
Existing Kalina cycle systems mainly focus on the recovery of a single heat source, rarely utilizing two heat sources simultaneously, and the separator is placed after the superheater, failing to fully improve steam temperature and turbine work efficiency.
A dual-heat-source waste heat recovery Kalina cycle power generation system for roller kilns is designed. A superheater is installed between the separator and the turbine to simultaneously recover high-temperature flue gas from the kiln head and cooling waste gas from the kiln tail. The power generation efficiency of the system is improved through an improved Kalina cycle structure.
It achieves efficient recovery of waste heat from both heat sources in the kiln, reducing energy consumption and environmental pollution, and improving power generation efficiency and the utilization efficiency of waste heat resources in the kiln.
Smart Images
Figure CN121452819A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of roller kiln power generation, and particularly to a roller kiln dual-heat-source waste heat recovery Kalina cycle power generation system and power generation method. Background Technology
[0002] Energy is a major factor affecting the survival and development of human society. In recent years, rapid socio-economic development has led to a surge in energy consumption in my country. Furthermore, large-scale energy consumption has also resulted in serious environmental problems. Therefore, alleviating the energy crisis and reducing environmental pollution are urgent tasks in my country.
[0003] While the ceramics industry has developed rapidly, it has also consumed a large amount of energy resources and caused serious environmental pollution. Statistics show that producing one square meter of ceramic tile consumes approximately 30-40 kWh of energy. Simultaneously, firing one ton of ceramic tiles produces approximately 260 kg of CO2. Therefore, implementing energy conservation and emission reduction is particularly important in the ceramics industry. In the ceramic tile production process, the largest energy consumption occurs in the firing stage of the roller kiln, accounting for 55% of the total energy consumed in ceramic tile production. Of this, approximately 54% of the input energy from the roller kiln is discharged into the environment through the high-temperature flue gas at the kiln head and the low-temperature cooling exhaust gas at the kiln tail, resulting in a significant waste of waste heat resources. Therefore, it is necessary to recover and utilize the flue gas and cooling exhaust gas from the roller kiln.
[0004] To address the issue of waste heat recovery, existing technologies employ the Kalina cycle system. However, most Kalina cycle systems currently focus on recovering heat from a single source, rarely addressing the simultaneous utilization of dual heat sources. Furthermore, existing Kalina cycle systems typically place the separator after the superheater, rarely considering placing it before the superheater. This would allow the ammonia-rich steam to be separated from the separator and then reheated in the superheater, increasing the steam temperature and improving turbine efficiency. Summary of the Invention
[0005] The purpose of this invention is to provide a Kalina cycle power generation system and method for waste heat recovery from a roller kiln with dual heat sources, in order to solve the problems mentioned in the background art.
[0006] To achieve the above objectives, the present invention provides the following technical solution: a roller kiln dual-heat-source waste heat recovery Kalina cycle power generation system, comprising a kiln body, one end of which is configured as a production waste gas emission end, and the other end of which is configured as a cooling waste gas emission end. A waste gas treatment mechanism is provided between the production waste gas emission end and the cooling waste gas emission end of the kiln body. The waste gas treatment mechanism includes a flue gas electrostatic precipitator configured at the production waste gas emission end and a cooling waste gas induced draft fan configured at the cooling waste gas emission end. A Kalina power generation component is configured between the exhaust end of the flue gas electrostatic precipitator and the inlet end of the cooling waste gas induced draft fan. A cooling mechanism is provided at the heat recovery end of the Kalina power generation component. A connecting member for interconnection between the waste gas treatment mechanism, the Kalina power generation component, and the cooling mechanism is provided.
[0007] Preferably, the kiln body has a kiln head chimney at the production waste gas emission end, and a flue gas induced draft fan at the exhaust end of the kiln head chimney. The exhaust end of the flue gas induced draft fan is connected to the inlet end of the flue gas electrostatic precipitator. The Kalina power generation assembly includes a superheater for connecting to the flue gas electrostatic precipitator and a second evaporator for connecting to the cooling waste gas induced draft fan. The kiln body has a kiln tail chimney at the cooling waste gas emission end, and the exhaust end of the kiln tail chimney is connected to the inlet end of the cooling waste gas induced draft fan. The exhaust end of the cooling waste gas induced draft fan is connected to the inlet of the second evaporator.
[0008] Preferably, the exhaust end of the superheater is provided with a first evaporator, the exhaust end of the first evaporator is provided with a flue gas flow valve, and the end of the flue gas flow valve away from the first evaporator is provided with a flue gas outlet.
[0009] Preferably, a preheater is provided at the exhaust gas discharge end of the second evaporator, and a cooling exhaust gas flow valve is provided at the exhaust gas discharge end of the preheater. A cooling exhaust gas outlet is provided at the end of the cooling exhaust gas flow valve away from the preheater.
[0010] Preferably, the liquid inlet end of the preheater is provided with a high-temperature regenerator, the liquid outlet end of the preheater is connected to the liquid inlet ends of the first evaporator and the second evaporator respectively, the liquid outlet ends of the first evaporator and the second evaporator are provided with separators, the exhaust end of the separator is connected to the air inlet end of the superheater, and the liquid outlet end of the separator is connected to the liquid inlet end of the high-temperature regenerator.
[0011] Preferably, the superheater is equipped with a turbine at its exhaust end, a generator at its output end, a mixer at its exhaust end, and a throttling valve at its discharge end. The end of the throttling valve furthest from the high-temperature regenerator is connected to the inlet end of the mixer.
[0012] Preferably, the discharge end of the mixer is provided with a low-temperature regenerator, the cooling mechanism includes a condenser, the inlet end of the condenser is conductively connected to the outlet end of the low-temperature regenerator, the outlet end of the condenser is provided with a shut-off valve, the end of the shut-off valve away from the condenser is provided with a cooling tower, the outlet end of the cooling tower is provided with a cooling water pump, the discharge end of the cooling water pump is conductively connected to the inlet end of the condenser, the discharge end of the condenser is provided with a working fluid pump, the discharge end of the working fluid pump is conductively connected to the inlet end of the low-temperature regenerator, and the discharge end of the low-temperature regenerator is conductively connected to the inlet end of the high-temperature regenerator.
[0013] A power generation method for a roller kiln dual-heat-source waste heat recovery Kalina cycle power generation system, the power generation system described above, the power generation method includes the following processes;
[0014] In the first process, the high-temperature flue gas generated at the kiln's production exhaust end is accelerated and drawn away from the exhaust end of the kiln head chimney by the flue gas induced draft fan and transported to the flue gas electrostatic precipitator. After being purified by the flue gas electrostatic precipitator, the high-temperature flue gas is transported to the superheater and then to the first evaporator. After heat exchange, the low-temperature flue gas discharged from the exhaust end of the first evaporator is discharged from the flue gas outlet of the kiln through the flue gas flow valve.
[0015] In the second process, the cooling exhaust gas generated at the kiln body cooling exhaust gas emission end is transported from the exhaust end of the kiln tail chimney to the second evaporator under the suction of the cooling exhaust gas induced draft fan, and then from the exhaust end of the second evaporator to the preheater. After passing through the preheater, the low-temperature exhaust gas is discharged from the cooling exhaust gas outlet through the control of the cooling exhaust gas flow valve.
[0016] In process three, an ammonia-water mixture with a concentration of 0.7-0.9% is used as the working fluid and charged into the preheater. After preheating, the ammonia-water mixture is divided into two streams. One stream enters the first evaporator and is heated by the flue gas; the other stream enters the second evaporator and is heated by the cooled waste gas. Then, the mixture from the first and second evaporators forms a two-phase mixture that enters the separator. The separator separates it into ammonia-rich vapor and ammonia-lean liquid. The ammonia-rich vapor enters the superheater from the separator for reheating. After gaining heat, it generates high-pressure ammonia-rich vapor, which is then transported to the turbine. The turbine drives the generator to generate electricity. At the same time, the low-pressure gas discharged from the turbine exhaust end enters the mixer.
[0017] The lean ammonia liquid discharged from the separator enters the high-temperature regenerator to release heat, and then flows through the throttling valve into the mixer to mix with the low-pressure fluid of the turbine.
[0018] In process four, the gas-liquid mixture discharged from the mixer is further cooled by the low-temperature regenerator and then sent to the condenser to be cooled into liquid ammonia water. After that, the liquid ammonia water is pressurized by the working fluid pump and sent to the low-temperature regenerator to be warmed up. After being warmed up again by the high-temperature regenerator, it enters the preheater to start a new cycle.
[0019] In step five, the chilled water from the condenser is pumped to the cooling tower by a cooling water pump to release heat. Then, it flows back to the condenser through a shut-off valve. The condenser then pumps the chilled water to the low-temperature regenerator for cooling. The cooled water that has absorbed heat then flows back to the condenser and is circulated through the cooling tower for further cooling.
[0020] The technical effects and advantages of this invention are as follows:
[0021] (1) This invention provides a dual-heat-source waste heat recovery Kalina cycle power generation system for roller kilns, which simultaneously recovers flue gas from the kiln head and cooling exhaust gas from the kiln tail to fully utilize the waste heat resources of the roller kiln and reduce energy consumption and environmental pollution. Simultaneously, structural improvements to the Kalina cycle enhance the system's power generation efficiency and improve the utilization efficiency of the kiln's waste heat resources.
[0022] (2) In the Kalina cycle power generation system of the present invention, a superheater is installed between the separator and the turbine, so that the ammonia-rich steam discharged from the separator will be heated again by the superheater, thereby increasing the enthalpy of the steam entering the turbine, thereby increasing the turbine's work capacity and improving the power generation efficiency of the system. Attached Figure Description
[0023] Figure 1 This is a schematic diagram of the power generation system of the present invention.
[0024] Figure 2 This is a schematic diagram of the connector of the present invention.
[0025] Figure 3 This is a side view of the structure of the connector of the present invention.
[0026] Figure 4 This is a cross-sectional view of the connector of the present invention.
[0027] Figure 5 For the present invention Figure 4 A magnified schematic diagram of the structure at point A in the middle.
[0028] Figure 6 For the present invention Figure 4 Enlarged schematic diagram of the structure at point B.
[0029] In the diagram: 1. Kiln body; 101. Kiln head chimney; 2. Flue gas induced draft fan; 3. Flue gas electrostatic precipitator; 4. Flue gas flow valve; 5. Flue gas outlet; 6. Kiln tail chimney; 7. Cooling exhaust gas induced draft fan; 8. Cooling exhaust gas flow valve; 9. Cooling exhaust gas outlet; 10. Preheater; 11. First evaporator; 12. Second evaporator; 13. Superheater; 14. Turbine; 15. Generator; 16. Mixer; 17. Low-temperature regenerator; 18. Condenser; 19. Working fluid pump; 2 0. Separator; 21. High-temperature regenerator; 22. Throttling valve; 23. Cooling water pump; 24. Cooling tower; 25. Shut-off valve; 26. Connecting sleeve; 2601. Connecting plate; 2602. Butt plate; 2603. Positioning hole; 2604. Bearing; 27. Flexible sealing sleeve; 2701. Control lever; 2702. Adjusting screw; 2703. Limiting slider; 2704. Top support spring; 2705. Positioning insert; 2706. Tightening cavity; 2707. Binding rope. Detailed Implementation
[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0031] This invention provides, for example Figure 1 The roller kiln dual-heat-source waste heat recovery Kalina cycle power generation system shown includes a kiln body 1. One end of the kiln body 1 is set as the production waste gas emission end, and the other end of the kiln body 1 is set as the cooling waste gas emission end. A waste gas treatment mechanism is set between the production waste gas emission end and the cooling waste gas emission end of the kiln body 1. The waste gas treatment mechanism includes a flue gas electrostatic precipitator 3 set at the production waste gas emission end and a cooling waste gas induced draft fan 7 set at the cooling waste gas emission end. A Kalina power generation component is set between the exhaust end of the flue gas electrostatic precipitator 3 and the inlet end of the cooling waste gas induced draft fan 7. A cooling mechanism is set at the heat recovery end of the Kalina power generation component.
[0032] It should be noted that the kiln body 1 in this scheme is a kiln for producing ceramic tiles. One end of its interior is set as the green body end, and the other end is the end where the green body becomes molten tile after firing. The production exhaust gas emission end is for emitting the high-heat flue gas generated during the firing of the green body into molten tile, and the cooling exhaust gas emission end is the port for emitting the gas used to cool the molten tile after it has been formed.
[0033] Specifically, the kiln body 1 is equipped with a kiln head chimney 101 at the exhaust end of the production waste gas, and a flue gas induced draft fan 2 is installed at the exhaust end of the kiln head chimney 101. The exhaust end of the flue gas induced draft fan 2 is connected to the inlet end of the flue gas electrostatic precipitator 3. The Kalina power generation assembly includes a superheater 13 for connecting to the flue gas electrostatic precipitator 3 and a second evaporator 12 for connecting to the cooling waste gas induced draft fan 7.
[0034] It should be noted that the high-temperature flue gas generated by the kiln body 1 is discharged from the kiln head chimney 101. The flue gas is accelerated by the flue gas induced draft fan 2 to avoid heat loss during the slow flow of the high-temperature flue gas. Then, the dust in the high-temperature flue gas is removed by the flue gas electrostatic precipitator 3 to avoid subsequent impact on other processing equipment.
[0035] Furthermore, a kiln tail chimney 6 is provided at the cooling exhaust end of the kiln body 1. The exhaust end of the kiln tail chimney 6 is connected to the air inlet of the cooling exhaust fan 7, and the exhaust end of the cooling exhaust fan 7 is connected to the air inlet of the second evaporator 12.
[0036] Furthermore, a first evaporator 11 is provided at the exhaust end of the superheater 13, and a flue gas flow valve 4 is provided at the exhaust end of the first evaporator 11. A flue gas outlet 5 is provided at the end of the flue gas flow valve 4 away from the first evaporator 11.
[0037] Furthermore, a preheater 10 is provided at the exhaust gas discharge end of the second evaporator 12, and a cooling exhaust gas flow valve 8 is provided at the exhaust gas discharge end of the preheater 10. A cooling exhaust gas outlet 9 is provided at the end of the cooling exhaust gas flow valve 8 away from the preheater 10.
[0038] It should be noted that, in actual connection and use, the low-temperature flue gas discharged from the flue gas discharge end of the first evaporator 11 is connected to the flue gas flow valve 4 through a pipeline. The discharge end of the flue gas flow valve 4 is used to connect to the flue gas outlet 5 of the roller kiln. The cooling waste gas generated by the roller kiln is connected to the inlet end of the cooling waste gas induced draft fan 7 through a pipeline from the flue gas outlet of the kiln tail chimney 6. The waste gas discharged from the discharge end of the cooling waste gas induced draft fan 7 enters the second evaporator 12 of the Kalina power generation unit. The waste gas discharge end of the second evaporator 12 is connected to the preheater 10. The low-temperature waste gas discharged from the waste gas discharge end of the preheater 10 is connected to the cooling waste gas flow valve 8 through a pipeline. The discharge end of the cooling waste gas flow valve 8 is used to connect to the cooling waste gas outlet 9 of the roller kiln.
[0039] Furthermore, a high-temperature regenerator 21 is provided at the liquid inlet end of the preheater 10, and the liquid outlet end of the preheater 10 is connected to the liquid inlet ends of the first evaporator 11 and the second evaporator 12 respectively. A separator 20 is provided at the liquid outlet ends of the first evaporator 11 and the second evaporator 12. The exhaust end of the separator 20 is connected to the air inlet end of the superheater 13, and the liquid outlet end of the separator 20 is connected to the liquid inlet end of the high-temperature regenerator 21.
[0040] It should be noted that a working fluid is used in the Kalina power generation unit. This working fluid is an ammonia-water mixture with a concentration of 0.7-0.9. After entering the preheater 10 and being preheated by the cooling exhaust gas of the roller kiln, the ammonia-water mixture is divided into two parts. One part of the working fluid enters the first evaporator 11, is heated by the flue gas, and is then output from the drain end of the first evaporator 11. The other part of the working fluid enters the second evaporator 12, is heated by the cooling exhaust gas, and is then output from the drain end of the second evaporator 12.
[0041] Specifically, a turbine 14 is provided at the exhaust end of the superheater 13, a generator 15 is provided at the output end of the turbine 14, a mixer 16 is provided at the exhaust end of the turbine 14, and a throttling valve 22 is provided at the discharge end of the high-temperature regenerator 21. The end of the throttling valve 22 away from the high-temperature regenerator 21 is connected to the inlet end of the mixer 16.
[0042] It should be noted that the working fluid discharged from the drain end of the first evaporator 11 and the two-phase mixture discharged from the drain end of the second evaporator 12 enter the separator 20. The ammonia-water mixture is separated into ammonia-rich vapor and ammonia-lean liquid in the separator 20. The ammonia-rich vapor is discharged from the upper outlet of the separator 20 and enters the superheater 13 through a pipe. After being reheated by the flue gas in the superheater 13, it is discharged from its outlet. After gaining heat, it generates high-pressure ammonia-rich vapor, which is transported to the turbine 14. The turbine 14 drives the generator 15 to generate electricity. At the same time, the low-pressure gas discharged from the outlet of the turbine 14 enters the mixer 16.
[0043] Turbine 14 is a machine that converts the energy contained in a fluid medium into mechanical work; it is also called a turbine. The operating conditions and the medium used in turbine 14 vary, resulting in a wide variety of structural forms, but their basic working principles are similar. The most important component of turbine 14 is the rotating element, which is mounted on the turbine 14's shaft and has blades arranged evenly along its circumference.
[0044] Furthermore, a low-temperature regenerator 17 is provided at the discharge end of the mixer 16, and the cooling mechanism includes a condenser 18. The feed end of the condenser 18 is connected to the discharge end of the low-temperature regenerator 17. A shut-off valve 25 is provided at the discharge end of the condenser 18. A cooling tower 24 is provided at the end of the shut-off valve 25 away from the condenser 18. A cooling water pump 23 is provided at the discharge end of the cooling tower 24. The discharge end of the cooling water pump 23 is connected to the inlet end of the condenser 18. A working fluid pump 19 is provided at the discharge end of the condenser 18. The discharge end of the working fluid pump 19 is connected to the inlet end of the low-temperature regenerator 17. The discharge end of the low-temperature regenerator 17 is connected to the inlet end of the high-temperature regenerator 21.
[0045] It should be noted that the lean ammonia liquid discharged from the drain end of separator 20 enters high-temperature regenerator 21. After releasing heat through high-temperature regenerator 21, it flows out from the drain end, passes through throttling valve 22, and enters mixer 16, where it mixes with the low-pressure fluid of turbine 14. The gas-liquid mixture discharged from mixer 16 is further cooled by low-temperature regenerator 17. The drain end of low-temperature regenerator 17 is connected to condenser 18. After being cooled into liquid ammonia water in condenser 18, the gas-liquid mixture enters working fluid pump 19. After being pressurized by working fluid pump 19, the high-pressure liquid ammonia water is transported to low-temperature regenerator 17 for reheating. The low-temperature side outlet of low-temperature regenerator 17 is connected to the low-temperature side inlet of high-temperature regenerator 21. After being reheated again in high-temperature regenerator 21, the working fluid enters preheater 10 to start a new cycle.
[0046] The cold water inlet of the condenser 18 in the cooling mechanism is connected to the outlet of the cooling tower 24 through the cooling water pump 23. The outlet of the condenser 18 is connected to the inlet of the cooling tower 24 through the shut-off valve 25. The cooling water that has released heat in the cooling tower 24 is recycled.
[0047] like Figures 1 to 6 As shown, there are connecting parts between the exhaust gas treatment unit, the Kalina power generation unit, and the cooling unit for interconnection among the three.
[0048] Specifically, the connector includes a connecting sleeve 26, with flexible sealing sleeves 27 at both ends of the connecting sleeve 26, and a connecting plate 2601 at both ends of the connecting sleeve 26. An adjusting screw 2702 is vertically threaded through the middle of the connecting plate 2601. A mating plate 2602 is fitted at the bottom of the adjusting screw 2702, and a control rotating rod 2701 is fitted at the top of the adjusting screw 2702. The top of the control rotating rod 2701 passes through the middle of the flexible sealing sleeve 27, and a binding mechanism for tightening the flexible sealing sleeve 27 is provided between the control rotating rod 2701 and the through end of the flexible sealing sleeve 27.
[0049] It should be noted that the outer diameter of the connecting sleeve 26 needs to exceed the outer diameter of the connecting pipe between each mechanism. The flexible sealing sleeve 27 is made of polyurethane material, which has good ductility, so it can shrink and tighten when subjected to pressure or contraction. The length of the mating plate 2602 is 2-3 times the length of the connecting plate 2601. After the mating plate 2602 is inserted into the pipe to be connected, the mating plate 2602 is first inserted into the connecting pipe, thus forming an auxiliary mating.
[0050] Furthermore, a bearing 2604 is provided between the bottom of the adjusting screw 2702 and the insertion point of the docking plate 2602. Multiple positioning holes 2603 are provided around the side of the connecting plate 2601 away from the connecting sleeve 26. A positioning block 2705 is fixedly connected to the side of the bottom end of the control rod 2701. The positioning block 2705 is slidably inserted into one of the positioning holes 2603.
[0051] It should be noted that in actual use, when it is necessary to rotate the control lever 2701, the control lever 2701 should be pulled away from the adjusting screw 2702 first. This will cause the lower positioning block 2705 to move out of the positioning hole 2603, thereby allowing the control lever 2701 to rotate.
[0052] The inner walls on both sides of the intersection of the control lever 2701 and the adjusting screw 2702 are provided with limiting grooves. The top of the adjusting screw 2702 is fixedly connected to both sides of the limiting slider 2703. The limiting slider 2703 is slidably inserted into the limiting groove. The limiting groove is provided with a top support spring 2704.
[0053] It should be noted that, due to the structural design of the limiting slider 2703 and the limiting groove, the control lever 2701 can drive the adjusting screw 2702 to rotate synchronously when it is rotating, thus achieving adjustment control of the adjusting screw 2702 through continuous driving.
[0054] The flexible sealing sleeve 27 has a tightening cavity 2706 in the middle. The binding mechanism includes a binding rope 2707 disposed in the tightening cavity 2706. One end of the binding rope 2707 is fixedly connected to the inner wall of one side of the tightening cavity 2706, and the other end of the binding rope 2707 is sleeved on the outer wall of the control lever 2701.
[0055] It should be noted that since the length of the binding rope 2707 is fixed, the binding rope 2707 will be wound and unwound during the rotation of the control rod 2701, thereby enabling the flexible sealing sleeve 27 to shrink and tighten under the traction of the binding rope 2707.
[0056] A power generation method for a roller kiln dual-heat-source waste heat recovery Kalina cycle power generation system, which employs a power generation system and includes the following processes;
[0057] In the first process, the high-temperature flue gas generated at the exhaust end of the kiln body 1 is accelerated and drawn away from the exhaust end of the kiln head chimney 101 by the flue gas induced draft fan 2 and transported to the flue gas electrostatic precipitator 3. The high-temperature flue gas purified by the flue gas electrostatic precipitator 3 is transported to the superheater 13 and then to the first evaporator 11. After heat exchange, the low-temperature flue gas discharged from the exhaust end of the first evaporator 11 is discharged from the flue gas outlet 5 of the kiln body 1 through the flue gas flow valve 4.
[0058] It should be noted that this process is the utilization of waste heat from the exhaust gas at the kiln body 1, and this waste heat is transported to the first evaporator 11 for use.
[0059] In process two, the cooling exhaust gas generated at the exhaust end of the kiln body 1 is transported from the exhaust end of the kiln tail chimney 6 to the second evaporator 12 by the exhaust fan 7, and then from the exhaust end of the second evaporator 12 to the preheater 10. After passing through the preheater 10, the low-temperature exhaust gas is discharged from the cooling exhaust outlet 9 by the control of the cooling exhaust gas flow valve 8.
[0060] It should be noted that this process is the utilization of waste heat from the exhaust gas at the cooling exhaust end of kiln body 1. This waste heat is transported to the second evaporator 12 for use.
[0061] In process three, an ammonia-water mixture with a concentration of 0.7-0.9 is used as the working fluid and is charged into the preheater 10. After preheating, the ammonia-water mixture is divided into two paths. One path enters the first evaporator 11 and is heated by the flue gas; the other path enters the second evaporator 12 and is heated by the cooled waste gas. Then, the mixture from the first evaporator 11 and the second evaporator 12 forms a two-phase mixture that enters the separator 20. The separator 20 separates the mixture into ammonia-rich vapor and ammonia-lean liquid. The ammonia-rich vapor enters the superheater 13 from the separator 20 for reheating. After gaining heat, it generates high-pressure ammonia-rich vapor, which is then transported to the turbine 14. The turbine 14 drives the generator 15 to generate electricity. At the same time, the low-pressure gas discharged from the exhaust end of the turbine 14 enters the mixer 16.
[0062] It should be noted that the process uses a mixture of ammonia and water with a concentration of 0.7-0.9 as the working fluid. After the waste heat is utilized at the production exhaust end and cooling exhaust end of the kiln body 1, ammonia-rich steam is generated to drive the turbine 14, thereby driving the generator 15 to generate electricity.
[0063] The lean ammonia liquid discharged from the separator 20 enters the high-temperature regenerator 21 to release heat, and then flows through the throttling valve 22 into the mixer 16 to mix with the low-pressure fluid of the turbine 14.
[0064] In process four, the gas-liquid mixture discharged from the mixer 16 is further cooled by the low-temperature regenerator 17 and then sent to the condenser 18 to be cooled into liquid ammonia water. After that, the liquid ammonia water is pressurized by the working fluid pump 19 and sent to the low-temperature regenerator 17 to be heated again. After being heated again by the high-temperature regenerator 21, it enters the preheater 10 to start a new cycle.
[0065] It should be noted that this process involves cooling the gas-liquid mixture to form a working fluid that can be recycled.
[0066] In process five, the cold water from the condenser 18 is pumped to the cooling tower 24 by the cooling water pump 23 to release heat, and then flows back to the condenser 18 through the shut-off valve 25. The condenser 18 then pumps the cold water to the low-temperature regenerator 17 for cooling through the working fluid pump 19. The cooled water that has absorbed heat then flows back to the condenser 18 and is circulated through the cooling tower 24 for cooling.
[0067] It should be noted that this process describes the circulation of cooling water and completes the continuous cooling cycle of the low-temperature regenerator 17 to ensure the stability of the entire working process.
[0068] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.
Claims
1. A roller kiln dual-heat-source waste heat recovery Kalina cycle power generation system, comprising a kiln body (1), wherein one end of the kiln body (1) is configured as a production waste gas emission end, and the other end of the kiln body (1) is configured as a cooling waste gas emission end, characterized in that, A waste gas treatment mechanism is provided between the production waste gas emission end and the cooling waste gas emission end of the kiln body (1). The waste gas treatment mechanism includes a flue gas electrostatic precipitator (3) provided at the production waste gas emission end and a cooling waste gas induced draft fan (7) provided at the cooling waste gas emission end. A Kalina power generation component is provided between the exhaust end of the flue gas electrostatic precipitator (3) and the inlet end of the cooling waste gas induced draft fan (7). A cooling mechanism is provided at the regenerating end of the Kalina power generation component. A connecting component for interconnection between the waste gas treatment mechanism, the Kalina power generation component and the cooling mechanism is provided.
2. The Kalina cycle power generation system for dual heat source waste heat recovery of a roller kiln according to claim 1, characterized in that, The kiln body (1) is provided with a kiln head chimney (101) at the production waste gas emission end. A flue gas induced draft fan (2) is provided at the exhaust end of the kiln head chimney (101). The exhaust end of the flue gas induced draft fan (2) is connected to the air inlet of the flue gas electrostatic precipitator (3). The Kalina power generation assembly includes a superheater (13) for connecting to the flue gas electrostatic precipitator (3) and a second evaporator (12) for connecting to the cooling waste gas induced draft fan (7). The kiln body (1) is provided with a kiln tail chimney (6) at the cooling waste gas emission end. The exhaust end of the kiln tail chimney (6) is connected to the air inlet of the cooling waste gas induced draft fan (7). The exhaust end of the cooling waste gas induced draft fan (7) is connected to the air inlet of the second evaporator (12).
3. The Kalina cycle power generation system for dual heat source waste heat recovery of a roller kiln according to claim 2, characterized in that, The superheater (13) is provided with a first evaporator (11) at the exhaust end, and a flue gas flow valve (4) is provided at the exhaust end of the first evaporator (11). A flue gas outlet (5) is provided at the end of the flue gas flow valve (4) away from the first evaporator (11).
4. The Kalina cycle power generation system for dual heat source waste heat recovery of a roller kiln according to claim 3, characterized in that, The exhaust gas discharge end of the second evaporator (12) is provided with a preheater (10), and the exhaust gas discharge end of the preheater (10) is provided with a cooling exhaust gas flow valve (8). The end of the cooling exhaust gas flow valve (8) away from the preheater (10) is provided with a cooling exhaust gas outlet (9).
5. The Kalina cycle power generation system for dual heat source waste heat recovery of a roller kiln according to claim 4, characterized in that, The preheater (10) is equipped with a high-temperature regenerator (21) at its liquid inlet end. The liquid outlet end of the preheater (10) is connected to the liquid inlet ends of the first evaporator (11) and the second evaporator (12), respectively. The liquid outlet ends of the first evaporator (11) and the second evaporator (12) are equipped with separators (20). The exhaust end of the separator (20) is connected to the air inlet end of the superheater (13). The liquid outlet end of the separator (20) is connected to the liquid inlet end of the high-temperature regenerator (21).
6. The Kalina cycle power generation system for dual heat source waste heat recovery of a roller kiln according to claim 5, characterized in that, The superheater (13) is equipped with a turbine (14) at its exhaust end, and a generator (15) is equipped at the output end of the turbine (14). A mixer (16) is also equipped at the exhaust end of the turbine (14). A throttling valve (22) is also equipped at the discharge end of the high-temperature regenerator (21). The end of the throttling valve (22) away from the high-temperature regenerator (21) is connected to the inlet end of the mixer (16).
7. The Kalina cycle power generation system for dual heat source waste heat recovery of a roller kiln according to claim 6, characterized in that, The discharge end of the mixer (16) is provided with a low-temperature regenerator (17). The cooling mechanism includes a condenser (18). The feed end of the condenser (18) is connected to the discharge end of the low-temperature regenerator (17). The discharge end of the condenser (18) is provided with a shut-off valve (25). A cooling tower (24) is provided at the end of the shut-off valve (25) away from the condenser (18). A cooling water pump (23) is provided at the discharge end of the cooling tower (24). The discharge end of the cooling water pump (23) is connected to the inlet end of the condenser (18). A working fluid pump (19) is provided at the discharge end of the condenser (18). The discharge end of the working fluid pump (19) is connected to the inlet end of the low-temperature regenerator (17). The discharge end of the low-temperature regenerator (17) is connected to the inlet end of the high-temperature regenerator (21).
8. A power generation method for a roller kiln dual-heat-source waste heat recovery Kalina cycle power generation system, employing the power generation system described in any one of claims 1-7, characterized in that, The power generation method includes the following processes; In the first process, the high-temperature flue gas generated at the exhaust end of the kiln body (1) is accelerated and drawn away by the flue gas induced draft fan (2) from the exhaust end of the kiln head chimney (101) and transported to the flue gas electrostatic precipitator (3). The high-temperature flue gas purified by the flue gas electrostatic precipitator (3) is transported to the superheater (13) and then to the first evaporator (11). After heat exchange, the low-temperature flue gas discharged from the exhaust end of the first evaporator (11) is discharged from the flue gas outlet (5) of the kiln body (1) through the flue gas flow valve (4). In process two, the cooling exhaust gas generated at the exhaust end of the kiln body (1) is transported from the exhaust end of the kiln tail chimney (6) to the second evaporator (12) under the suction of the cooling exhaust gas induced draft fan (7), and then transported from the exhaust end of the second evaporator (12) to the preheater (10). After passing through the preheater (10), the low-temperature exhaust gas is discharged from the cooling exhaust gas outlet (9) under the control of the cooling exhaust gas flow valve (8). In process three, an ammonia-water mixture with a concentration of 0.7-0.9 is used as the working fluid and is charged into the preheater (10). After preheating, the ammonia-water mixture is divided into two paths. One path enters the first evaporator (11) and is heated by the flue gas; the other path enters the second evaporator (12) and is heated by the cooling exhaust gas. Then, the mixture is separated by the first evaporator (11) and the second evaporator (12) to form a two-phase mixture that enters the separator (20). The separator (20) separates the mixture into ammonia-rich vapor and ammonia-lean liquid. The ammonia-rich vapor enters the superheater (13) from the separator (20) for reheating. After obtaining heat, it generates high-pressure ammonia-rich vapor and is transported to the turbine (14). The turbine (14) drives the generator (15) to generate electricity. At the same time, the low-pressure gas discharged from the exhaust end of the turbine (14) enters the mixer (16). The lean ammonia liquid discharged from the separator (20) enters the high-temperature regenerator (21) to release heat, and then flows through the throttle valve (22) into the mixer (16) to mix with the low-pressure fluid of the turbine (14); In process four, the gas-liquid mixture discharged from the mixer (16) is further cooled by the low-temperature regenerator (17) and then sent to the condenser (18) to be cooled into liquid ammonia water. After that, the liquid ammonia water is pressurized by the working fluid pump (19) and sent to the low-temperature regenerator (17) to be warmed up. After being warmed up again by the high-temperature regenerator (21), it enters the preheater (10) to start a new cycle. In process five, the cold water in the condenser (18) is pumped to the cooling tower (24) by the cooling water pump (23) to release heat. Then, it is returned to the condenser (18) through the shut-off valve (25). The condenser (18) then pumps the cold water to the low-temperature regenerator (17) through the working fluid pump (19) for cooling. The cooled water after absorbing heat is returned to the condenser (18) and circulated for cooling through the cooling tower (24).