Cement kiln different-temperature-difference waste heat power generation system based on Kalina double circulation

Abstract

The utility model relates to the technical field of energy utilization and conversion, in particular to technical innovation aiming at waste heat recovery and utilization in the cement production process, and particularly relates to a cement kiln different-temperature-difference waste heat power generation system based on Kalina double circulation. Comprising a cement kiln, a kiln tail flue gas loop, a kiln head cooling gas loop, a cooling loop and a Kalina double-circulation waste heat power generation device. The cement kiln different-temperature-difference waste heat power generation system based on Kalina double circulation has obvious advantages in the aspects of waste heat recovery efficiency, power generation capacity, environmental protection benefits and the like, and a new solution is provided for energy conservation, emission reduction and sustainable development of the cement industry.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of energy utilization and conversion, especially to the technical innovation of waste heat recovery and utilization in the cement production process, in particular to a cement kiln different temperature difference waste heat power generation system based on Kalina double cycle. BACKGROUND

[0002] As a typical high energy consumption industry, the energy consumption of cement production industry accounts for 40%-60% of the production cost; in the cement clinker production process, the waste gas discharged by the kiln tail preheater and the kiln head cooler and other equipment carries a large amount of heat energy, and the heat energy loss of these waste gas can be as high as 40% of the total input energy; therefore, effectively recovering and utilizing the heat energy in these waste gas not only helps to reduce the energy consumption of cement production, but also reduces environmental pollution, realizes the double promotion of economic benefit and environmental benefit.

[0003] At present, the waste heat recovery technology of cement kiln mainly focuses on waste heat power generation, heat supply and refrigeration and other fields; among them, the waste heat power generation technology has attracted widespread attention and research because it can convert low-grade waste heat energy into high-grade electric energy; however, the existing cement kiln waste heat power generation system mostly only recovers and utilizes the high-temperature waste gas of the kiln tail preheater, and ignores the waste heat recovery potential of the kiln head cooling waste gas with huge flow and low temperature; in addition, the current waste heat recovery system in the cement production process mainly adopts organic Rankine cycle system, which is constant temperature phase change in the heat exchange process, and the heat transfer temperature difference is large, which leads to large loss and low heat and electricity conversion efficiency.

[0004] In view of the above problems, Kalina cycle system has great application potential in cement double heat source waste heat recovery because of its advantages of variable temperature phase change, strong adaptability and high heat and electricity conversion efficiency; however, the utilization of Kalina system in cement production waste heat recovery is still relatively rare, especially the Kalina double cycle system for simultaneously recovering and utilizing waste heat at different temperature levels of cement kiln is rare.

[0005] Therefore, the utility model aims at providing a cement kiln different temperature difference waste heat power generation system based on Kalina double cycle to solve the single heat source and low heat and electricity conversion efficiency of the existing cement kiln waste heat recovery system; by adopting the double cycle new structure, the cement kiln kiln head high-temperature flue gas and kiln tail low-temperature waste gas are simultaneously recovered and utilized, the waste heat recovery efficiency and power generation capacity are improved, and strong support is provided for the energy saving and emission reduction and sustainable development of cement production industry. UTILITY MODEL CONTENTS

[0006] The utility model discloses a purpose lies in providing a kind of cement kiln different temperature difference waste heat power generation system based on karyna double cycle, to solve the single heat source of existing cement kiln waste heat recovery system in prior art and the low efficiency of thermoelectric conversion and other limitations problems, the system is fused cement production, waste heat recovery, karyna cycle power generation and multiple technical fields, to realize the efficient conversion and utilization of energy by efficient utilization of cement kiln waste heat resources of different temperature levels, promote energy saving and emission reduction and sustainable development.

[0007] To realize the above-mentioned purpose, the utility model provides following technical scheme: a kind of cement kiln different temperature difference waste heat power generation system based on karyna double cycle, including cement kiln, kiln tail flue gas loop, kiln head cooling gas loop, cooling loop and karyna double cycle waste heat power generation device;

[0008] The karyna double cycle waste heat power generation system includes a high-pressure circulation loop and a low-pressure circulation loop;The high-pressure circulation loop includes a high-pressure superheater, a high-pressure evaporator, a high-pressure preheater, a high-pressure separator, a regenerator, a high-pressure throttle valve, a high-pressure turbine, a high-pressure generator, a high-pressure working medium pump, a mixer, a condenser and a working medium pump;The low-pressure circulation loop includes a low-pressure superheater, a low-pressure evaporator, a low-pressure preheater, a low-pressure separator, a low-pressure throttle valve, a low-pressure turbine and a low-pressure generator;The components are connected by pipes.

[0009] The kiln tail flue gas loop of the cement kiln is connected to the outlet of the cyclone preheater through a pipe and the inlet of butterfly valve a;The outlet of butterfly valve a is connected to the inlet of the high-pressure superheater in the high-pressure loop through a pipe;The outlet of the high-pressure superheater is connected to the inlet of the high-pressure evaporator;The outlet of the high-pressure evaporator is connected to the inlet of the high-pressure preheater;The outlet of the high-pressure preheater is connected to the inlet of butterfly valve b;The outlet of butterfly valve b is connected to the inlet of the flue gas dust collector;The outlet of the flue gas dust collector is connected to the inlet of the flue gas induced draft fan;The outlet of the flue gas induced draft fan is connected to the inlet of the bottom of the flue gas chimney;The flue gas enters the flue gas chimney and is discharged to the external environment through the outlet of the flue gas chimney.

[0010] The kiln head cooling gas loop of the cement kiln is connected to the outlet of the kiln head clinker cooler through a pipe and the inlet of butterfly valve d;The outlet of butterfly valve d is connected to the inlet of the low-pressure superheater in the low-pressure loop through a pipe;The outlet of the low-pressure superheater is connected to the inlet of the low-pressure evaporator;The outlet of the low-pressure evaporator is connected to the inlet of the low-pressure preheater;The outlet of the low-pressure preheater is connected to the inlet of butterfly valve e;The outlet of butterfly valve e is connected to the inlet of the cooling gas dust collector;The outlet of the cooling gas dust collector is connected to the inlet of the cooling gas induced draft fan;The outlet of the cooling gas induced draft fan is connected to the inlet of the bottom of the cooling gas chimney;The cooling gas enters the flue gas chimney and is discharged to the external environment through the outlet of the flue gas chimney.

[0011] The cooling circuit is connected with the outlet of the condenser in the high-pressure circulation circuit through a pipeline at the inlet of a stop valve, the outlet of the stop valve is connected with the inlet of the cooling tower, the outlet of the cooling tower is connected with the inlet of the circulating water pump, and the outlet of the circulating water pump is connected with the inlet of the condenser.

[0012] Further, the ammonia water mixture is discharged from the outlet of the regenerator after heat absorption, part of the fluid enters the high-pressure circulation circuit, and the other part enters the low-pressure circulation circuit.

[0013] Further, in the high-pressure circulation circuit, the part of the ammonia water mixture discharged from the regenerator is pressurized by the high-pressure working medium pump, preheated in the high-pressure preheater, and then enters the high-pressure evaporator, and the fluid is vaporized into a high-pressure two-phase mixture in the high-pressure evaporator, and the high-pressure two-phase mixture is discharged from the outlet of the high-pressure evaporator and enters the high-pressure separator.

[0014] Further, the high-pressure two-phase mixture is separated into high-pressure ammonia-rich vapor and ammonia-poor liquid in the high-pressure separator; the high-pressure ammonia-rich vapor is discharged from the top of the high-pressure separator, overheated in the high-pressure superheater, and then enters the high-pressure turbine to expand and do work to generate electricity, and the exhaust steam discharged from the outlet of the high-pressure turbine enters the mixer, and the high-pressure turbine drives the high-pressure generator through a shaft coupling; the high-pressure ammonia-poor liquid is discharged from the bottom of the high-pressure separator, and then enters the regenerator to release heat, and the liquid discharged from the outlet of the regenerator enters the high-pressure throttling valve and is depressurized.

[0015] Further, in the low-pressure circulation circuit, the part of the ammonia water mixture discharged from the regenerator is preheated in the low-pressure preheater, the preheated working medium enters the low-pressure evaporator, the fluid is further heated and vaporized into a low-pressure two-phase mixture in the low-pressure evaporator, and the low-pressure two-phase mixture is discharged from the outlet of the low-pressure evaporator and enters the low-pressure separator, and the low-pressure two-phase mixture is separated into low-pressure ammonia-rich vapor and ammonia-poor fluid in the low-pressure separator.

[0016] Further, the low-pressure ammonia-rich vapor is overheated in the low-pressure superheater, enters the low-pressure turbine to expand and do work, the exhaust steam discharged from the outlet of the low-pressure turbine enters the mixer, the low-pressure turbine drives the low-pressure generator through a shaft coupling, and the low-pressure ammonia-poor fluid discharged from the bottom outlet of the low-pressure separator enters the low-pressure throttling valve, the pressure of the low-pressure ammonia-poor fluid is reduced in the low-pressure throttling valve, and then the low-pressure ammonia-poor fluid is mixed with the fluid discharged from the outlet of the high-pressure throttling valve.

[0017] Further, the mixed working fluid and the exhaust steam discharged from the outlets of the high-pressure turbine and the low-pressure turbine are mixed in the mixer to form an ammonia water mixture, and the gas-liquid mixture discharged from the outlet of the mixer enters the condenser to be cooled, and the cooled liquid discharged from the outlet of the condenser is pressurized in the working medium pump, and then enters the regenerator to be warmed, and a new cycle is started.

[0018] Further, the cooling circuit, the cooling water releases heat in the cooling tower, and then is discharged from the outlet of the cooling tower into the water pump, enters the condenser after passing through the water pump, is discharged from the outlet of the condenser after obtaining heat in the condenser, enters the cooling tower after passing through the stop valve, and is cooled to start a new cycle.

[0019] The cement kiln different temperature difference waste heat power generation system based on Kalina double circulation has obvious advantages in waste heat recovery efficiency, power generation capacity and environmental protection benefits, and provides a new solution for energy saving and emission reduction and sustainable development of the cement industry.

[0020] (I) efficient waste heat recovery and utilization: the cement kiln different temperature difference waste heat power generation system based on Kalina double circulation has a double circulation structure of the Kalina power generation system, which realizes simultaneous and efficient waste heat recovery of the high-temperature flue gas at the kiln head and the low-temperature waste gas at the kiln tail; this double heat source recovery mechanism not only fully utilizes the waste heat resources in the cement production process, but also significantly reduces the dependence on fuel in the product production process, thereby reducing environmental pollution, and has important environmental protection significance for promoting energy saving and emission reduction and sustainable development; in addition, the medium and low temperature quality heat energy which is difficult to utilize is converted into high quality electric energy, promoting the transformation and upgrading of industrial energy utilization, and helping to reduce enterprise production cost and improve economic benefit.

[0021] (II) cascade utilization and heat efficiency improvement: the double circulation structure of the utility model specially designs high and low pressure two circulation loops to process different temperature heat sources, realizing cascade utilization of waste heat; this design makes energy more reasonably distributed and more efficiently utilized, increases the turbine doing function, and further improves the power generation capacity and overall heat efficiency of the system; compared with the traditional single cycle waste heat recovery system, the double circulation structure of the utility model has obvious advantages in energy utilization efficiency and power generation capacity.

[0022] (III) temperature change and phase change Loss reduction: the ammonia water mixed working medium used in the Kalina power generation system has the characteristics of temperature change and phase change, which reduces the heat transfer temperature difference in the heat exchange process, thereby reducing the heat transfer process Loss; The reduction of loss means the improvement of energy utilization efficiency, so that the system can more effectively convert waste heat into electric energy; in addition, the concentration of the ammonia water mixed working medium can also be adjusted according to different working conditions, further improving the flexibility and adaptability of the system.

[0023] (IV) System integration and environmental benefits: the waste heat power generation system of the utility model is closely integrated with the production process of the cement kiln, without additional heat source or cooling equipment, which reduces the complexity and operating cost of the system; at the same time, by reducing the consumption of fuel and reducing environmental pollution, the system provides strong technical support for green production of the cement industry, which helps to achieve the sustainable development goal of the industry. BRIEF DESCRIPTION OF DRAWINGS

[0024] The accompanying drawings are included to provide a further understanding of the utility model, and constitute a part of the specification, which are used together with the embodiments of the utility model to explain the utility model, and do not constitute the limitation to the utility model. In the drawings:

[0025] Figure 1 It is a cement kiln different temperature difference waste heat power generation system schematic diagram based on Kalina double cycle of the utility model.

[0026] In the drawing: 1, cement kiln;2, cyclone preheater;3, butterfly valve a;4, butterfly valve b;5, butterfly valve c;6, flue gas dust collector;7, flue gas induced draft fan;8, flue gas chimney;9, kiln head clinker cooler;10, butterfly valve d;11, butterfly valve e;12, butterfly valve f;13, cooling gas dust collector;14, cooling gas induced draft fan;15, cooling gas chimney;16, high-pressure preheater;17, high-pressure evaporator;18, high-pressure superheater;19, high-pressure separator;20, regenerator;21, high-pressure throttle valve;22, high-pressure turbine;23, high-pressure generator;24, mixer;25, condenser;26, working medium pump;27, high-pressure working medium pump;28, low-pressure preheater;29, low-pressure evaporator;30, low-pressure superheater;31, low-pressure separator;32, low-pressure throttle valve;33, low-pressure turbine;34, low-pressure generator;35, stop valve;36, cooling tower;37, water pump. DETAILED DESCRIPTION

[0027] The technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model, obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the utility model.

[0028] Embodiment 1

[0029] Please refer to Figure 1 The utility model provides the following technical scheme: a cement kiln different temperature difference waste heat power generation system based on Kalina double cycle, comprising a cement kiln 1, a kiln tail flue gas loop, a kiln head cooling gas loop, a cooling loop and a Kalina double cycle waste heat power generation device.

[0030] In this embodiment: the Kalina double-cycle waste heat power generation device includes a high-pressure cycle loop and a low-pressure cycle loop, the high-pressure cycle loop includes a high-pressure preheater 16, a high-pressure evaporator 17, a high-pressure superheater 18, a high-pressure separator 19, a high-pressure throttle valve 21, a high-pressure turbine 22, a high-pressure generator 23, a high-pressure working medium pump 26, a regenerator 20, a mixer 24, a condenser 25 and a working medium pump 26, and the low-pressure cycle loop includes a low-pressure preheater 28, a low-pressure evaporator 29, a low-pressure superheater 30, a low-pressure separator 31, a low-pressure throttle valve 32, a low-pressure turbine 33 and a low-pressure generator 34.

[0031] In this embodiment: the cement kiln tail gas loop is connected with the high-pressure superheater 18, the high-pressure evaporator 17 and the high-pressure preheater 16 in the high-pressure loop of the Kalina double-cycle waste heat power generation device, the cement kiln head cooling gas loop is connected with the low-pressure superheater 30, the low-pressure evaporator 29 and the low-pressure preheater 28 in the low-pressure cycle loop of the Kalina double-cycle waste heat power generation device, and the cooling loop is connected with the condenser 25 of the Kalina double-cycle waste heat power generation device.

[0032] In this embodiment: the system can realize full and efficient cascade utilization of different temperature difference heat sources of the high-temperature flue gas at the kiln head and the low-temperature exhaust gas at the kiln tail of the cement kiln, and improve the work capacity of the turbine and the power generation capacity of the system.

[0033] In this embodiment: the ammonia water mixed working medium used in the Kalina double-cycle waste heat power generation system has the characteristics of temperature change and phase change, can reduce the heat transfer temperature difference in the heat exchange process, thereby reducing the heat transfer process loss, improving the energy utilization efficiency, and can adjust the ammonia water concentration according to different working conditions.

[0034] In this embodiment: the kiln tail gas loop includes a cyclone preheater 2, a flue gas butterfly valve a 3, a flue gas butterfly valve b 4, a flue gas dust collector 6, a flue gas induced draft fan 7 and a flue gas chimney 8.

[0035] Specifically, the cyclone preheater 2 is used to preheat the material entering the cement kiln 1, and at the same time, collect the high-temperature flue gas at the kiln tail. Butterfly valve a 3: control the flow direction of the high-temperature flue gas at the kiln tail of the cement kiln 1 to the high-pressure superheater 18, used to adjust the flue gas flux. Butterfly valve b 4: control the flue gas flowing out from the high-pressure preheater 16 to enter the flue gas dust collector 6, adjust the flue gas flow. Butterfly valve c 5: when the double-cycle Kalina device is not installed, used to control the flue gas at the kiln tail of the cement kiln 1 to enter the flue gas dust collector 6.

[0036] In this embodiment: the kiln head cooling gas loop includes a clinker cooler 9, a butterfly valve 10d, a butterfly valve 11e, a cooling gas dust collector 13, a cooling gas induced draft fan 14 and a cooling gas chimney 15.

[0037] In this embodiment: the cooling circuit includes a circulating water pump 37, a cooling tower 36 and a stop valve 35.

[0038] In this embodiment: in the high pressure cycle, the part of ammonia water mixture from the regenerator 20 enters the high pressure working medium pump 27, is pressurized, enters the high pressure preheater 16, is preheated, enters the high pressure evaporator 17 through the pipeline, and the fluid is vaporized into a high pressure two-phase mixture in the high pressure evaporator 17. The high pressure two-phase mixture is discharged from the high pressure evaporator 17 outlet and enters the high pressure separator 19. The high pressure ammonia-rich vapor at the top of the high pressure separator 19 is superheated in the high pressure superheater 18, enters the high pressure turbine 22, expands to do work, and generates electricity. The exhaust steam from the turbine outlet enters the mixer 24.

[0039] Specifically, the flue gas dust collector 6 removes particulate matter in the flue gas, purifying the flue gas. The flue gas induced draft fan 7 provides the necessary suction to make the flue gas pass through the flue gas dust collector 6 and then enter the flue gas chimney 8. The flue gas chimney 8 discharges the treated flue gas into the atmosphere. The kiln head clinker cooler 9 cools the clinker generated at the kiln head of the cement kiln 1 and collects the cooling exhaust gas. The butterfly valve d10 controls the flow of the cooling exhaust gas from the kiln head of the cement kiln 1 to the low pressure superheater 30, which is used to adjust the exhaust gas flux. The butterfly valve e11 controls the cooling exhaust gas from the low pressure preheater 28 to enter the cooling gas dust collector 13, adjusting the exhaust gas flow. The butterfly valve f12 is not installed when the double-cycle Kalina device is not installed, and is used to control the cooling exhaust gas from the kiln head of the cement kiln 1 to enter the cooling gas dust collector 13. The cooling gas dust collector 13 removes particulate matter in the cooling exhaust gas, purifying the exhaust gas.

[0040] In this embodiment: in the low pressure cycle, the part of ammonia water mixture from the regenerator 20 enters the low pressure preheater 28, is preheated, and the preheated working medium enters the low pressure evaporator 29. The fluid is further heated and vaporized into a low pressure two-phase mixture in the low pressure evaporator.

[0041] Specifically, the cooling gas induced draft fan 14 provides the necessary suction to make the cooling exhaust gas pass through the cooling gas dust collector 13 and then enter the cooling gas chimney 15. The cooling gas chimney 15 discharges the treated cooling exhaust gas into the atmosphere. The high pressure preheater 16 preheats the working medium entering the high pressure evaporator 17. The high pressure evaporator 17 heats the working medium to a two-phase state. The high pressure superheater 18 further heats the high pressure steam to increase its superheat degree. The high pressure separator 19 separates the high pressure steam into high pressure ammonia-rich vapor and ammonia-lean liquid. The regenerator 20 preheats the working medium and recovers heat. The high pressure throttle valve 21 reduces the pressure of the high pressure ammonia-lean liquid to make it suitable for entering the regenerator 20. The high pressure ammonia-rich vapor in the high pressure turbine 22 expands to do work here, generating electricity. The high pressure generator 23 is driven by the high pressure turbine 22 to generate electricity. The mixer 24 mixes the exhaust steam from the outlets of the high pressure turbine 22 and the low pressure turbine 33. The condenser 25 condenses the mixture from the outlet of the mixer 24.

[0042] In this embodiment: the low-pressure two-phase mixture discharged from the low-pressure evaporator outlet enters the low-pressure separator 31, and is separated into a low-pressure ammonia-rich vapor and an ammonia-lean fluid in the low-pressure separator. The low-pressure ammonia-rich vapor is superheated in the low-pressure superheater 30, and then enters the low-pressure turbine 33 to expand and do work. The exhaust steam discharged from the low-pressure turbine outlet enters the mixer 24. The mixed working fluid and the exhaust steam discharged from the high-pressure and low-pressure turbine outlets are mixed in the mixer 24 to form an ammonia-water mixture. The gas-liquid mixture discharged from the mixer 24 outlet enters the condenser 25 to be cooled.

[0043] Specifically, for the cement kiln system without the double-cycle Kalina device, the cement kiln tail gas circuit, the about 440℃ high-temperature flue gas generated by the kiln tail of the cement kiln 1 is discharged from the outlet of the kiln head cyclone preheater 2, enters the butterfly valve c5 through the pipeline, and the outlet of the butterfly valve c5 is connected with the inlet of the flue gas dust remover 6. The flue gas discharged from the outlet of the flue gas dust remover 6 enters the flue gas induced draft fan 7, and the outlet of the flue gas induced draft fan 7 is connected with the inlet at the bottom of the flue gas chimney 8 through the pipeline. The flue gas enters the flue gas chimney 8 and is discharged to the external environment through the outlet of the flue gas chimney 8. The cement kiln head cooling gas circuit, the about 310℃ cooling waste gas generated by the kiln head of the cement kiln 1 is discharged from the outlet of the kiln head clinker cooler 9, enters the butterfly valve f12 through the pipeline, and the outlet of the butterfly valve f12 is connected with the inlet of the cooling gas dust remover 13 through the pipeline. The dust-removed cooling gas is discharged from the outlet of the dust remover 13, enters the cooling gas induced draft fan 14, and the outlet of the cooling gas induced draft fan 14 is connected with the inlet at the bottom of the cooling gas chimney 15. The cooling gas enters the cooling gas chimney 15 and is discharged to the external environment through the outlet of the cooling gas chimney 15.

[0044] In this embodiment: for the cement kiln system installed with double cycle Kalina device, the cement kiln tail gas circuit, the about 440℃ high temperature flue gas generated from the kiln tail of cement kiln 1 is discharged from the outlet of kiln head cyclone preheater 2, the outlet of kiln head cyclone preheater 2 is connected with butterfly valve a3 through pipeline, the flue gas discharged from the outlet end of butterfly valve a3 enters high pressure superheater 18, the outlet of high pressure superheater 18 is connected with the inlet of high pressure evaporator 17, the flue gas discharged from the outlet of high pressure evaporator 17 enters high pressure preheater 16, high pressure preheater 16 is connected with butterfly valve b4, the flue gas discharged from the outlet end of butterfly valve b4 enters flue gas dust collector 6, and other connection modes are the same as the kiln tail flue gas circuit without double cycle Kalina device. The cement kiln head cooling gas circuit, the about 310℃ cooling waste gas generated from the kiln head of cement kiln 1 is discharged from the outlet of kiln head clinker cooler 9, the outlet of kiln head clinker cooler 9 is connected with the inlet of butterfly valve d10 through pipeline, the cooling waste gas discharged from the outlet end of butterfly valve d10 enters low pressure superheater 30, the outlet end of low pressure superheater 30 is connected with the inlet of low pressure evaporator 29, the cooling waste gas discharged from the outlet of low pressure evaporator 29 enters low pressure preheater 28, the outlet end of low pressure preheater 28 is connected with the inlet of butterfly valve e11, and the cooling waste gas is discharged from the outlet of butterfly valve e11 and then enters cooling gas dust collector 13, and other connection modes are the same as the kiln head cooling gas circuit without double cycle Kalina device.

[0045] In this embodiment: the Kalina double cycle waste heat power generation system, the ammonia water mixture is discharged from the outlet of regenerator 20 after heat recovery, part of the fluid enters the high pressure cycle circuit, and the other part of the fluid enters the low pressure cycle circuit. The high pressure cycle circuit, the part of ammonia water mixture discharged from the regenerator 20 enters high pressure working medium pump 27, is pressurized and then discharged from the outlet of high pressure working medium pump 27, the outlet of high pressure working medium pump 27 is connected with the inlet of high pressure preheater 16, the ammonia water mixture is preheated in high pressure preheater 16, enters high pressure evaporator 17, and the fluid is vaporized into high pressure two-phase mixture in high pressure evaporator 17. The two-phase mixture discharged from the outlet of high pressure evaporator 17 enters high pressure separator 19, and the two-phase mixture is separated into high pressure ammonia-rich vapor and ammonia-lean liquid in high pressure separator 19. The high pressure ammonia-rich vapor is discharged from high pressure separator 19, overheated in high pressure superheater 18, expanded in high pressure turbine 22 to generate electricity, and the exhaust steam from the outlet of high pressure turbine 22 enters mixer 24. The high pressure turbine 22 and high pressure generator 23 are connected through a shaft coupling.

[0046] In this embodiment: the high pressure ammonia-lean liquid at the bottom of high pressure separator 19 enters regenerator 20 to release heat, the outlet of regenerator 20 is connected with the inlet of high pressure throttling valve 21, the fluid is depressurized in high pressure throttling valve 21 and discharged from the outlet thereof.

[0047] The low pressure cycle loop, the part of the ammonia water mixture from the outlet of the regenerator 20 enters the low pressure preheater 28 to be preheated, the outlet of the low pressure preheater 28 is connected with the inlet of the low pressure evaporator 29, the ammonia water mixture is heated and vaporized into a low pressure two-phase mixture in the low pressure evaporator 29, the low pressure two-phase mixture from the outlet of the low pressure evaporator 29 enters the low pressure separator 31, the two-phase mixture is separated into a low pressure ammonia-rich vapor and a low pressure ammonia-lean fluid in the low pressure separator 31. The low pressure ammonia-rich vapor separated from the top of the low pressure separator 31 enters the low pressure superheater 30, is superheated in the low pressure superheater 30 and is discharged from the outlet thereof to enter the low pressure turbine 33, the low pressure ammonia-rich vapor is expanded to do work in the low pressure turbine 33, the exhaust steam from the outlet of the low pressure turbine 33 enters the mixer 24, the low pressure turbine 33 drives the low pressure generator 34 through a coupling, the low pressure ammonia-lean fluid from the bottom outlet of the low pressure separator 31 enters the low pressure throttling valve 32, the fluid from the outlet of the low pressure throttling valve 32 is mixed with the fluid from the outlet of the high pressure throttling valve 21. The mixed working fluid is mixed with the exhaust steam from the outlets of the high pressure turbine 22 and the low pressure turbine 33 in the mixer 24 to form the ammonia water mixture.

[0048] In the embodiment: the outlet of the mixer 24 is connected with the inlet of the condenser 25, the mixture is cooled in the condenser 25 and is discharged from the outlet thereof to be pressurized in the working medium pump 26 and then is warmed in the regenerator 20 to start a new cycle. The cooling circuit, the cooling water is discharged from the outlet of the cooling tower 36 after releasing heat in the cooling tower 36, the outlet of the cooling tower 36 is connected with the inlet of the water pump 37, the cooling water from the outlet of the water pump 37 is discharged from the outlet thereof after obtaining heat in the condenser 25, passes through the stop valve 35 and then is cooled in the cooling water tower 36 to start a new cycle.

[0049] The working principle and use process of the cement kiln different temperature difference waste heat power generation system based on the Kalina double cycle are as follows: when the cement kiln different temperature difference waste heat power generation system based on the Kalina double cycle is used, high-temperature flue gas with a temperature of about 440 DEG C generated at the tail of the cement kiln is discharged from the outlet of the cyclone preheater 2 at the kiln head. The high-temperature flue gas enters the butterfly valve a3 through a pipeline. For the case that the double-cycle Kalina device has been installed, the flue gas from the outlet of the butterfly valve a3 enters the high-pressure superheater 18. The flue gas transfers heat to the working medium in the high-pressure superheater 18 and then enters the high-pressure evaporator 17. The flue gas passing through the high-pressure evaporator 17 continues to enter the high-pressure preheater 16. The flue gas from the high-pressure preheater 16 enters the flue gas dust collector 6 through the butterfly valve b4. The flue gas after dust removal is sent into the flue gas induced draft fan 7 and then is discharged into the atmosphere through the flue gas chimney 8.

[0050] The cooling exhaust gas of about 310℃ generated from the cement kiln head is discharged from the outlet of the clinker cooler 9. The exhaust gas enters the butterfly valve d10 through the pipeline, and then enters the low-pressure superheater 30. In the low-pressure superheater 30, the exhaust gas transfers heat to the working medium of the low-pressure cycle, and then the exhaust gas enters the low-pressure evaporator 29. The exhaust gas from the low-pressure evaporator 29 continues to enter the low-pressure preheater 28. Through the butterfly valve e11, the exhaust gas enters the cooling gas dust collector 13. The dust-removed cooling exhaust gas is sent into the cooling gas chimney 15 by the cooling gas induced draft fan 14, and finally discharged into the atmosphere.

[0051] After the ammonia water mixture absorbs heat in the regenerator 20, part of it is pressurized by the high-pressure working medium pump 27. The pressurized working medium is preheated in the high-pressure preheater 16, and then enters the high-pressure evaporator 17. In the high-pressure evaporator 17, the working medium is vaporized into a high-pressure two-phase mixture, and enters the high-pressure separator 19. In the high-pressure separator 19, the high-pressure two-phase mixture is separated into high-pressure ammonia-rich steam and ammonia-lean liquid. The ammonia-rich steam is further superheated in the high-pressure superheater 18, and then enters the high-pressure turbine 22 to expand and do work. The exhaust steam from the high-pressure turbine 22 enters the mixer 24. The high-pressure turbine 22 drives the high-pressure generator 23 to generate electricity through the coupling. The ammonia-lean liquid enters the regenerator 20 to release heat, and then enters the high-pressure throttle valve 21 to be depressurized. Another part of the ammonia water mixture enters the low-pressure preheater 28 after coming out of the regenerator 20. The preheated working medium enters the low-pressure evaporator 29 to be further heated and vaporized. The low-pressure two-phase mixture enters the low-pressure separator 31 to be separated into low-pressure ammonia-rich steam and ammonia-lean fluid. The ammonia-rich steam enters the low-pressure superheater 30 to be superheated, and then enters the low-pressure turbine 33 to expand and do work. The exhaust steam from the low-pressure turbine 33 also enters the mixer 24. The low-pressure turbine 33 drives the low-pressure generator 34 to generate electricity through the coupling. The ammonia-lean fluid enters the low-pressure throttle valve 32 to be depressurized.

[0052] The exhaust steam of the high-pressure and low-pressure cycles is mixed in the mixer 24 to form an ammonia water mixture. The mixed gas-liquid mixture enters the condenser 25 to be cooled. The cooled liquid from the condenser 25 enters the working medium pump 26 to be pressurized. The pressurized liquid returns to the regenerator 20 to be reheated, starting a new cycle. The cooling water releases heat in the cooling tower 36, enters the circulating water pump, and then enters the condenser 25. The heated cooling water enters the cooling tower 36 again through the stop valve to be cooled, starting a new cycle.

[0053] Example 2:

[0054] The utility model provides a cement kiln different temperature difference waste heat power generation system based on karenina double cycle, this system can efficiently recycle the waste heat of cement kiln head and kiln tail, and will it be converted into electric energy, the following is the specific implementation of this system:

[0055] System composition of the embodiment: the system mainly comprises a cement kiln 1, a kiln tail flue gas circuit, a kiln head cooling gas circuit, a cooling circuit and a Kalina double-cycle waste heat power generation device; wherein the Kalina double-cycle waste heat power generation device is the core part, comprising a high-pressure circulation loop and a low-pressure circulation loop.

[0056] Kiln tail flue gas circuit of the embodiment: the kiln tail flue gas circuit comprises a cyclone preheater 2, a flue gas butterfly valve a 3, a flue gas butterfly valve b 4, a flue gas dust collector 6, a flue gas induced draft fan 7 and a flue gas chimney 8; the high-temperature flue gas generated at the kiln tail of the cement kiln 1 is about 440℃, passes through the cyclone preheater 2, and then enters the high-pressure superheater 18 through the flue gas butterfly valve a 3.

[0057] Kiln head cooling gas circuit of the embodiment: the kiln head cooling gas circuit comprises a clinker cooler 9, a cooling gas butterfly valve d 10, a cooling gas butterfly valve e 11, a cooling gas dust collector 13, a cooling gas induced draft fan 14 and a cooling gas chimney 15; the cooling waste gas generated at the kiln head of the cement kiln 1 is about 310℃, passes through the clinker cooler 9, and then enters the low-pressure superheater 30 through the cooling gas butterfly valve d 10.

[0058] Kalina double-cycle waste heat power generation device of the embodiment

[0059] High-pressure circulation loop: the high-pressure circulation loop comprises a high-pressure preheater 16, a high-pressure evaporator 17, a high-pressure superheater 18, a high-pressure separator 19, a high-pressure throttle valve 21, a high-pressure turbine 22, a high-pressure generator 23, a high-pressure working medium pump 27, a regenerator 20, a mixer 24, a condenser 25 and a working medium pump 26; part of the ammonia water mixture discharged from the regenerator 20 enters the high-pressure working medium pump 27 to be pressurized, and then enters the high-pressure preheater 16 to be preheated; the preheated working medium enters the high-pressure evaporator 17 to be vaporized into a high-pressure two-phase mixture, and then enters the high-pressure separator 19 to be separated into a high-pressure ammonia-rich vapor and an ammonia-lean liquid; the high-pressure ammonia-rich vapor enters the high-pressure superheater 18 to be superheated, and then enters the high-pressure turbine 22 to expand and do work, driving the high-pressure generator 23 to generate electricity; the exhaust steam discharged from the high-pressure turbine 22 enters the mixer 24; the high-pressure ammonia-lean liquid enters the regenerator 20 to release heat, and then passes through the high-pressure throttle valve 21 to be depressurized.

[0060] Regarding the low-pressure circulation loop: the low-pressure circulation loop comprises a low-pressure preheater 28, a low-pressure evaporator 29, a low-pressure superheater 30, a low-pressure separator 31, a low-pressure throttling valve 32, a low-pressure turbine 33, and a low-pressure generator 34; another part of the ammonia-water mixture discharged from the regenerator 20 enters the low-pressure preheater 28 for preheating; the preheated working medium enters the low-pressure evaporator 29 to be heated and vaporized into a low-pressure two-phase mixture, and then enters the low-pressure separator 31 to be separated into a low-pressure ammonia-rich vapor and an ammonia-lean fluid; the low-pressure ammonia-rich vapor enters the low-pressure superheater 30 to be superheated, and then enters the low-pressure turbine 33 to expand and do work, thereby driving the low-pressure generator 34 to generate electricity; the exhaust steam discharged from the low-pressure turbine 33 enters the mixer 24; and the low-pressure ammonia-lean fluid enters the low-pressure throttling valve 32 to be depressurized.

[0061] Regarding mixing and condensation: the exhaust steam of the high-pressure and low-pressure circulation loops is mixed in the mixer 24 to form an ammonia-water mixture; the mixed gas-liquid mixture enters the condenser 25 to be cooled; the cooled liquid enters the working medium pump 26 to be pressurized, and then returns to the regenerator 20 to be reheated, thereby starting the next cycle.

[0062] Regarding the cooling loop in this embodiment: the cooling loop comprises a circulating water pump 37, a cooling tower 36, and a stop valve 35; the cooling water releases heat in the cooling tower 36, enters the condenser 25 to absorb heat through the circulating water pump 37, and then enters the cooling tower 36 again to be cooled through the stop valve 35, thereby forming a cycle.

[0063] Regarding the working principle of this embodiment: the system realizes full and efficient cascade utilization of different temperature difference heat sources of the cement kiln head high-temperature flue gas and the kiln tail low-temperature exhaust gas through the Kalina double-circulation waste heat power generation system; the high-pressure circulation loop processes the high-temperature flue gas, and the low-pressure circulation loop processes the low-temperature exhaust gas, so that the energy is more reasonably distributed and utilized; meanwhile, the temperature change and phase change characteristics of the ammonia-water mixed working medium reduce the heat transfer temperature difference and loss in the heat exchange process, and improve the energy utilization efficiency.

[0064] In this embodiment, the double recovery of the cement kiln head and kiln tail waste heat is realized, the waste heat resources are fully utilized, the fuel consumption and environmental pollution are reduced, the turbine work capacity and the power generation capacity of the system are improved, and the economic benefits are increased; the ammonia-water mixed working medium with temperature change and phase change characteristics is adopted, the heat transfer temperature difference and loss are reduced, and the energy utilization efficiency is improved; the system structure is flexible, the ammonia-water concentration can be adjusted according to different working conditions, and the adaptability is strong.

[0065] In summary, the cement kiln different temperature difference waste heat power generation system based on the Kalina double circulation provided by the utility model has the advantages of high efficiency, environmental protection, economy, etc., and is a waste heat power generation technology with wide application prospect.

[0066] Finally, it should be noted that: the above only for the preferred embodiments of the present application, and is not intended to limit the present application, although the foregoing embodiments of the present application have been described in detail, for the skilled in the art, it still can be modified, or for the equivalent replacement of part of the technical features of the technical solutions recorded in the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application, shall be included within the scope of the present application.

Claims

1. A cement kiln different temperature difference waste heat power generation system based on Kalina double cycle, characterized in that, The cement kiln, the kiln tail flue gas circuit, the kiln head cooling gas circuit, the cooling circuit and the Kalina double cycle waste heat power generation device are connected by pipes. The Kalina double cycle waste heat power generation device comprises a high pressure cycle circuit and a low pressure cycle circuit; the high pressure cycle circuit comprises a high pressure superheater (18), a high pressure evaporator (17), a high pressure preheater (16), a high pressure separator (19), a regenerator (20), a high pressure throttle valve (21), a high pressure turbine (22), a high pressure generator (23), a high pressure working medium pump (27), a mixer (24), a condenser (25) and a working medium pump (26); the low pressure cycle circuit comprises a low pressure superheater (30), a low pressure evaporator (29), a low pressure preheater (28), a low pressure separator (31), a low pressure throttle valve (32), a low pressure turbine (33) and a low pressure generator (34); each component is connected by pipes; the turbine and the generator are connected by a shaft coupling. The kiln tail flue gas circuit of the cement kiln is connected by pipes, i.e., the outlet of the cyclone preheater (2) is connected to the inlet of the butterfly valve a (3), the outlet of the butterfly valve a (3) is connected to the inlet of the high pressure superheater (18) in the high pressure cycle circuit, the outlet of the high pressure superheater (18) is connected to the inlet of the high pressure evaporator (17), the outlet of the high pressure evaporator (17) is connected to the inlet of the high pressure preheater (16), the outlet of the high pressure preheater (16) is connected to the inlet of the butterfly valve b (4), the outlet of the butterfly valve b (4) is connected to the inlet of the flue gas dust remover (6), the outlet of the flue gas dust remover (6) is connected to the inlet of the flue gas induced draft fan (7), the outlet of the flue gas induced draft fan (7) is connected to the inlet of the bottom of the flue gas chimney (8), and the flue gas enters the flue gas chimney (8) and is discharged to the external environment through the outlet of the flue gas chimney (8). The kiln head cooling gas circuit of the cement kiln is connected by pipes, i.e., the outlet of the kiln head clinker cooler (9) is connected to the inlet of the butterfly valve d (10), the outlet of the butterfly valve d (10) is connected to the inlet of the low pressure superheater (30) in the low pressure cycle circuit, the outlet of the low pressure superheater (30) is connected to the inlet of the low pressure evaporator (29), the outlet of the low pressure evaporator (29) is connected to the inlet of the low pressure preheater (28), the outlet of the low pressure preheater (28) is connected to the inlet of the butterfly valve e (11), the outlet of the butterfly valve e (11) is connected to the inlet of the cooling gas dust remover (13), the outlet of the cooling gas dust remover (13) is connected to the inlet of the cooling gas induced draft fan (14), the outlet of the cooling gas induced draft fan (14) is connected to the inlet of the bottom of the cooling gas chimney (15), and the cooling gas enters the flue gas chimney (8) and is discharged to the external environment through the outlet of the flue gas chimney (8). The cooling circuit is connected by pipes, i.e., the inlet of the stop valve (35) is connected to the outlet of the condenser (25) in the high pressure cycle circuit, the outlet of the stop valve (35) is connected to the inlet of the cooling tower (36), the outlet of the cooling tower (36) is connected to the inlet of the circulating water pump (37), and the outlet of the circulating water pump (37) is connected to the inlet of the condenser (25).

2. The Kalina cycle based cement kiln different temperature heat recovery power generation system according to claim 1, characterized in that: The ammonia water mixture absorbs heat in the regenerator (20) and is discharged from the outlet, part of the fluid enters the high pressure cycle circuit, and the other part of the fluid enters the low pressure cycle circuit.

3. The Kalina cycle based cement kiln different temperature heat recovery power generation system according to claim 2, characterized in that: The high-pressure circulation loop, part of the ammonia-water mixture discharged from the regenerator (20) enters the high-pressure working medium pump (27) and is pressurized, then enters the high-pressure preheater (16) for preheating, and enters the high-pressure evaporator (17) through a pipeline. The fluid is vaporized into a high-pressure two-phase mixture in the high-pressure evaporator (17), and is discharged from the high-pressure evaporator (17) outlet into the high-pressure separator (19).

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