Low-temperature waste heat flash evaporation and dual-pressure hybrid power generation system

Abstract

The utility model provides a low-temperature waste heat flash evaporation and dual-pressure hybrid power generation system which comprises a first rotary kiln structure, a flash evaporation power generation system connected to the first rotary kiln structure, a second rotary kiln structure and a dual-pressure power generation system connected to the second rotary kiln structure. High-temperature steam of the dual-pressure power generation system is connected to the steam outlet end of the flash evaporation power generation system, gradient utilization of heat energy is achieved, surplus power generation capacity of the flash evaporation power generation system is fully utilized, waste of the heat energy is avoided, different waste heat can be fully utilized through water vapor complementation, the overall utilization rate of the waste heat is remarkably improved, and the energy consumption is reduced. And meanwhile, energy consumption and emission are reduced, and remarkable economic and environmental benefits are achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to low temperature waste heat power generation system technical field, especially in low temperature waste heat flash steam and double pressure mixed power generation system. BACKGROUND

[0002] In cement kiln production, the low temperature waste heat power generation technology system is used to recover the heat energy in the production process to generate electricity, so that the waste heat is utilized, and its value is not only to improve the utilization rate of coal, but also to change it into high-quality energy - electricity, which can not only supplement the power consumption in production, but also effectively reduce the cost of cement production, and it is an important way for energy saving and consumption reduction of cement kiln production.

[0003] In the prior art, the existing flash steam waste heat generator set can meet the single production line and has a large power generation capacity surplus, but cannot meet the waste heat conversion of two production lines at the same time; two production lines need two sets of flash steam waste heat generator sets, but the cost of constructing two sets of flash steam waste heat generator sets is high, and both of the two sets of flash steam waste heat generator sets have a large power generation capacity surplus, which is not conducive to energy saving and consumption reduction of the whole factory. CONTENT OF THE UTILITY MODEL

[0004] Therefore, the utility model aims at providing a low temperature waste heat flash steam and double pressure mixed power generation system, which can effectively solve the above-mentioned problems in the prior art.

[0005] The utility model provides a low temperature waste heat flash evaporation and double pressure mixed power generation system, including first rotary kiln structure, be connected in the first rotary kiln structure for absorbing the flash evaporation power generation system of conversion waste heat gas in the first rotary kiln structure, second rotary kiln structure and be connected in the second rotary kiln structure for absorbing the double pressure power generation system of conversion waste heat gas in the second rotary kiln structure, the double pressure power generation system includes the second kiln boiler for absorbing the conversion waste heat gas in the second rotary kiln structure, be connected in the first gas outlet end of the second kiln boiler with the second gas outlet end for heat conversion second steam turbine, be connected on the second steam turbine second generator, be connected on the second steam turbine for generating condensate water second condenser and give the second kiln boiler water supply second water tank, the flash evaporation power generation system includes the first kiln boiler for absorbing the conversion waste heat gas in the first rotary kiln structure, be connected in the first gas outlet end of the first kiln boiler for heat conversion first steam turbine, be connected on the first steam turbine first generator, be connected on the first steam turbine for generating condensate water first condenser and give the first kiln boiler with the second kiln boiler water supply first water tank, be connected on the first kiln boiler and the second kiln boiler for water vapor separation flash evaporator assembly, the flash evaporator assembly includes first flash evaporator and second flash evaporator connected in the liquid outlet end of the first flash evaporator respectively connecting the second gas outlet end of the first kiln boiler and the third gas outlet end of the second kiln boiler, the gas outlet end of the first flash evaporator and the second flash evaporator is connected with the first steam turbine respectively, the liquid outlet end of the second flash evaporator is connected with the first water tank, the second kiln boiler is further provided with fourth gas outlet end, and the fourth gas outlet end of the second kiln boiler is communicated to the first gas outlet end of the first kiln boiler.

[0006] Compared with the prior art, the utility model has the advantages that: the steam generated by the first kiln boiler and the second kiln boiler enters the first flash evaporator and the second flash evaporator respectively for water vapor separation, the separated steam enters the first steam turbine for power generation, and the separated water enters the first water tank for recycling as water supply for the first kiln boiler and the second kiln boiler, so that the low-temperature waste heat that would otherwise be wasted is converted into electric energy, and energy waste is avoided; the high-temperature steam of the second kiln boiler enters the first gas outlet end of the first kiln boiler through the fourth gas outlet end, realizing cascade utilization of heat energy, fully utilizing the power generation capacity of the flash evaporation power generation system, avoiding waste of heat energy, and enabling the utility model to more fully utilize different waste heat through water vapor complementation, significantly improving the overall utilization rate of waste heat, improving overall power generation efficiency, reducing energy consumption and emissions, and having remarkable economic and environmental benefits.

[0007] Further, a kiln chimney for discharging kiln smoke is arranged on the first kiln boiler and the second kiln boiler, the kiln smoke discharged by the first kiln boiler has a temperature of 100-110℃, and the kiln smoke discharged by the second kiln boiler has a temperature of 80-90℃.

[0008] Further, the waste heat gas temperature of the first kiln boiler absorbing the first rotary kiln structure and the second kiln boiler absorbing the second rotary kiln structure is 400-500℃.

[0009] Further, the steam discharged by the first gas outlet end of the first kiln boiler is steam with a pressure of 2.16MPa and a temperature of 340℃.

[0010] Further, the steam discharged by the first gas outlet end of the second kiln boiler is steam with a pressure of 1.75MPa and a temperature of 328℃, and the steam discharged by the second gas outlet end of the second kiln boiler is steam with a pressure of 0.25MPa and a temperature of 188℃.

[0011] Further, the steam discharged by the fourth gas outlet end of the second kiln boiler is steam with a pressure of 2.16MPa and a temperature of 340℃.

[0012] Further, the steam discharged by the gas outlet end of the first flash evaporator is steam with a pressure of 0.85MPa and a temperature of 177℃.

[0013] Further, the steam discharged by the gas outlet end of the second flash evaporator is steam with a pressure of 0.15MPa and a temperature of 127℃.

[0014] Further, a cooling water tower is arranged on the first condenser and the second condenser.

[0015] Further, a speed reducer is arranged between the first steam turbine and the first generator. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a structure block diagram of the low-temperature waste heat flash evaporation and double-pressure mixed power generation system in the embodiment 1 of the present application.

[0017] Figure 2 It is a structure block diagram of the flash evaporation power generation system working independently in the embodiment 2 of the present application.

[0018] Figure 3 It is a structure block diagram of the double-pressure power generation system working independently in the embodiment 3 of the present application.

[0019] Explanation of main element symbols:

[0020] First kiln structure 10 Second turbine 23 First kiln boiler 12 Second generator 24 First turbine 13 Second condenser 25 First generator 14 Second water tank 26 First condenser 15 First flasher 31 First water tank 16 Second flasher 32 Speed reducer 17 Kiln chimney 40 Second kiln structure 20 Cooling water tower 50 Second kiln boiler 22

[0021] The following detailed description will further explain the present application with reference to the above mentioned drawings. DETAILED DESCRIPTION

[0022] For the purpose of facilitating the understanding of the present application, the present application will be described more fully with reference to the related drawings. The drawings show several embodiments of the present application. However, the present application can be realized in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0023] It should be noted that when an element is referred to as being "fixed" to another element, it can be directly on the other element or intervening elements can also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements can also be present. As used herein the terms "vertical", "horizontal", "left", "right" and similar terms are used for explanation purposes only.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0025] Example 1

[0026] Please refer to Figure 1The utility model discloses an embodiment 1 provides a kind of low-temperature waste heat flash evaporation and double pressure mixed power generation system, including the first rotary kiln structure 10, be connected in the first rotary kiln structure 10 for absorbing conversion the flash evaporation power generation system of waste heat gas in the first rotary kiln structure 10, second rotary kiln structure 20 and be connected in the second rotary kiln structure 20 for absorbing conversion the double pressure power generation system of waste heat gas in the second rotary kiln structure 20, the double pressure power generation system includes for absorbing conversion the second kiln boiler 22 of waste heat gas in the second rotary kiln structure 20, be connected in the first gas outlet end and the second gas outlet end of the second kiln boiler 22 for heat conversion second steam turbine 23, be connected on the second steam turbine 23 second generator 24, be connected on the second steam turbine 23 for producing condensate second condenser 25 and give the second kiln boiler 22 water supply second water tank 26, the flash evaporation power generation system includes for absorbing conversion the first kiln boiler 12 of waste heat gas in the first rotary kiln structure 10, be connected in the first gas outlet end for heat conversion first steam turbine 13 of the first kiln boiler 12, be connected on the first steam turbine 13 first generator 14, be connected on the first steam turbine 13 for producing condensate first condenser 15 and give the first kiln boiler 12 and the second kiln boiler 22 water supply first water tank 16, on the first kiln boiler 12 and the second kiln boiler 22 be connected for water vapor separation flash evaporator assembly, the flash evaporator assembly includes respectively connecting the second gas outlet end of the first kiln boiler 12 and the third gas outlet end of the second kiln boiler 22 first flash evaporator 31 and be connected in the liquid outlet end of the first flash evaporator 31 second flash evaporator 32, the gas outlet end of the first flash evaporator 31 and the second flash evaporator 32 is connected with the first steam turbine 13 respectively, the liquid outlet end of the second flash evaporator 32 is connected with the first water tank 16, the second kiln boiler 22 is further provided with fourth gas outlet end, and the fourth gas outlet end of the second kiln boiler 22 is communicated to the first gas outlet end of the first kiln boiler 12.

[0027] Need to be explained, the flash evaporation power generation system is 15MW flash evaporation waste heat generator set, and the double pressure power generation system is 6MW double pressure waste heat generator set.

[0028] It can be understood that when the first rotary kiln structure 10 and the second rotary kiln structure 20 work simultaneously, the first kiln boiler 12 and the second kiln boiler 22 absorb waste heat gas generated by the first rotary kiln structure 10 and the second rotary kiln structure 20 respectively, and generate steam.

[0029] Further, the waste heat gas temperature absorbed by the first kiln boiler 12 and the second kiln boiler 22 is 400-500 DEG C.

[0030] The first outlet end of the first kiln boiler 12 discharges steam at a pressure of 2.16 MPa and a temperature of 340°C, the fourth outlet end of the second kiln boiler 22 discharges steam at a pressure of 2.16 MPa and a temperature of 340°C, the steam discharged from the first outlet end of the first kiln boiler 12 and the steam discharged from the fourth outlet end of the second kiln boiler 22 are combined and fed into the first steam turbine 13 to drive the first generator 14 to generate electricity, and the condensed water produced by the first condenser 15 is supplied to the first kiln boiler 12 and the second kiln boiler 22 through the first water tank 16.

[0031] The first outlet end of the second kiln boiler 22 discharges steam at a pressure of 1.75 MPa and a temperature of 328°C, the second outlet end of the second kiln boiler 22 discharges steam at a pressure of 0.25 MPa and a temperature of 188°C, the steam discharged from the first outlet end of the second kiln boiler 22 and the steam discharged from the second outlet end of the second kiln boiler 22 are respectively fed into the second steam turbine 23 to drive the second generator 24 to generate electricity, and the condensed water produced by the second condenser 25 is supplied to the second kiln boiler 22 through the second water tank 26.

[0032] Meanwhile, the steam discharged from the second outlet end of the first kiln boiler 12 and the steam discharged from the third outlet end of the second kiln boiler 22 are respectively fed into the first flash evaporator 31 for water-vapor separation, the first flash evaporator 31 separates steam at a pressure of 0.85 MPa and a temperature of 177°C, which is fed into the first steam turbine 13 to drive the first generator 14 to generate electricity, the water separated by the first flash evaporator 31 is fed into the second flash evaporator 32 for water-vapor separation, the second flash evaporator 32 separates steam at a pressure of 0.15 MPa and a temperature of 127°C, which is fed into the first steam turbine 13 to drive the first generator 14 to generate electricity, and the water separated by the second flash evaporator 32 is combined with the water in the first water tank 16 and then supplied to the first kiln boiler 12 and the second kiln boiler 22.

[0033] It can be understood that the steam generated by the first kiln boiler 12 and the second kiln boiler 22 enters the first flash evaporator 31 and the second flash evaporator 32 respectively for water vapor separation, the separated steam enters the first steam turbine for power generation, and the separated water enters the first water tank to supply the first kiln boiler 12 and the second kiln boiler 22 as make-up water for recycling, so that the low-temperature waste heat that would otherwise be wasted is converted into electric energy, avoiding energy waste; the high-temperature steam of the second kiln boiler 22 enters the first gas outlet end of the first kiln boiler 12 through the fourth gas outlet end, realizing step-by-step utilization of heat energy, avoiding waste of heat energy, and fully utilizing the excess power generation capacity of the flash power generation system, so that the utility model can more fully utilize different waste heat through water vapor complementation, significantly improves the overall utilization rate of waste heat, improves the overall power generation efficiency, reduces energy consumption and emissions, and has significant economic and environmental benefits.

[0034] Further, the first kiln boiler 12 and the second kiln boiler 22 are both provided with a kiln chimney 40 for discharging kiln smoke, the kiln smoke discharged by the first kiln boiler 12 has a temperature of 100-110 DEG C, and the kiln smoke discharged by the second kiln boiler 22 has a temperature of 80-90 DEG C.

[0035] Further, the first condenser 15 and the second condenser 25 are both provided with a cooling water tower 50.

[0036] It can be understood that by providing the condensing water tower 50, stable low-temperature cooling water can be provided by the condensing water tower 50, improving the cooling effect of the first condenser 15 and the second condenser 25.

[0037] Further, a speed reducer 17 is further arranged between the first steam turbine 13 and the first generator 14.

[0038] It can be understood that by providing the speed reducer 17, the rotational speed of the speed reducer 17 can be adjusted, so that the first steam turbine 13 and the first generator 14 are matched and run at their respective optimal efficiency points, improving the overall system efficiency.

[0039] Embodiment 2

[0040] Please refer to Figure 2 , when the first rotary kiln structure 10 works alone, the first kiln boiler 12 absorbs the waste heat gas generated by the first rotary kiln structure 10 at a temperature of 400-500 DEG C and generates steam.

[0041] The first outlet end of the first kiln boiler 12 discharges steam at a pressure of 2.16 MPa and a temperature of 340°C, which enters the first steam turbine 13 for heat conversion to drive the first generator 14 to generate electricity, and the condensate water generated by the first condenser 15 is supplied to the first kiln boiler 12 through the first water tank 16.

[0042] Meanwhile, the steam discharged from the second outlet end of the first kiln boiler 12 enters the first flash evaporator 31 for water-vapor separation, the first flash evaporator 31 separates steam at a pressure of 0.85 MPa and a temperature of 177°C, which enters the first steam turbine 13 for heat conversion to drive the first generator 14 to generate electricity, the water separated by the first flash evaporator 31 enters the second flash evaporator 32 for water-vapor separation, the second flash evaporator 32 separates steam at a pressure of 0.15 MPa and a temperature of 127°C, which enters the first steam turbine 13 for heat conversion to drive the first generator 14 to generate electricity, and the water separated by the second flash evaporator 32 is combined with the water in the first water tank 16 and then supplied to the first kiln boiler 12.

[0043] Example 3

[0044] Please refer to Figure 3 When the second rotary kiln structure 20 works alone, the second kiln boiler 22 absorbs the waste heat gas generated by the second rotary kiln structure 20 at a temperature of 400-500°C and generates steam.

[0045] The fourth outlet end of the second kiln boiler 22 discharges steam at a pressure of 2.16 MPa and a temperature of 340°C, which enters the first steam turbine 13 for heat conversion to drive the first generator 14 to generate electricity, and the condensate water generated by the first condenser 15 is supplied to the second kiln boiler 22 through the first water tank 16.

[0046] The first outlet end of the second kiln boiler 22 discharges steam at a pressure of 1.75 MPa and a temperature of 328°C, and the second outlet end of the second kiln boiler 22 discharges steam at a pressure of 0.25 MPa and a temperature of 188°C, which respectively enter the second steam turbine 23 for heat conversion to drive the second generator 24 to generate electricity, and the condensate water generated by the second condenser 25 is supplied to the second kiln boiler 22 through the second water tank 26.

[0047] Meanwhile, the steam discharged from the third gas outlet end of the second kiln boiler 22 enters the first flash evaporator 31 to separate water and steam, the first flash evaporator 31 separates steam at a pressure of 0.85 MPa and a temperature of 177℃ to enter the first steam turbine 13 to drive the first generator 14 to generate electricity, and the water separated by the first flash evaporator 31 enters the second flash evaporator 32 to separate water and steam, the second flash evaporator 32 separates steam at a pressure of 0.15 MPa and a temperature of 127℃ to enter the first steam turbine 13 to drive the first generator 14 to generate electricity, and the water separated by the second flash evaporator 32 enters the first water tank 16 to be supplied to the second kiln boiler 22 after being mixed with the water in the first water tank 16.

[0048] In summary, the low-temperature waste heat flash evaporation and double-pressure combined power generation system in the above-mentioned embodiments of the present application separates the steam generated by the first kiln boiler and the second kiln boiler in the first flash evaporator and the second flash evaporator respectively, the steam separated by the first flash evaporator and the second flash evaporator enters the first steam turbine to generate electricity, and the water separated enters the first water tank to be supplied to the first kiln boiler and the second kiln boiler as make-up water for recycling, so that the low-temperature waste heat that would otherwise be wasted is converted into electrical energy, avoiding energy waste; the high-temperature steam of the second kiln boiler enters the first gas outlet end of the first kiln boiler through the fourth gas outlet end, realizing cascade utilization of heat energy, and fully utilizing the excess power generation capacity of the flash evaporation power generation system, avoiding waste of heat energy, so that the present application can more fully utilize different waste heat through water-steam complementation, significantly improving the overall utilization rate of waste heat and the overall power generation efficiency, while reducing energy consumption and emissions, having significant economic and environmental benefits.

[0049] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0050] The above-described embodiments only express several implementation manners of the present application, the description is more specific and detailed, but it should not be understood as a limitation on the scope of the patent of the present application. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are all within the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A low-temperature waste heat flash evaporation and dual-pressure combined power generation system, characterized by, The first rotary kiln structure, the flash evaporation power generation system connected to the first rotary kiln structure for absorbing and converting the waste heat gas inside the first rotary kiln structure, the second rotary kiln structure, and the double-pressure power generation system connected to the second rotary kiln structure for absorbing and converting the waste heat gas inside the second rotary kiln structure, the double-pressure power generation system comprising a second kiln boiler for absorbing and converting the waste heat gas inside the second rotary kiln structure, a second steam turbine connected to the first gas outlet end and the second gas outlet end of the second kiln boiler for heat conversion, a second generator connected to the second steam turbine, a second condenser connected to the second steam turbine for generating condensed water, and a second water tank for supplying water to the second kiln boiler, the flash evaporation power generation system comprising a first kiln boiler for absorbing and converting the waste heat gas inside the first rotary kiln structure, a first steam turbine connected to the first gas outlet end of the first kiln boiler for heat conversion, a first generator connected to the first steam turbine, a first condenser connected to the first steam turbine for generating condensed water, and a first water tank for supplying water to the first kiln boiler and the second kiln boiler, a flash evaporator assembly for water vapor separation being connected to the first kiln boiler and the second kiln boiler, the flash evaporator assembly comprising a first flash evaporator connected to the second gas outlet end of the first kiln boiler and the third gas outlet end of the second kiln boiler respectively, and a second flash evaporator connected to the liquid outlet end of the first flash evaporator, the gas outlet ends of the first flash evaporator and the second flash evaporator being connected to the first steam turbine respectively, and the liquid outlet end of the second flash evaporator being connected to the first water tank, the second kiln boiler being further provided with a fourth gas outlet end, and the fourth gas outlet end of the second kiln boiler being communicated to the first gas outlet end of the first kiln boiler.

2. The low temperature waste heat flash and binary combined cycle power generation system of claim 1, wherein, A kiln chimney for discharging kiln smoke is arranged on the first kiln boiler and the second kiln boiler, the kiln smoke discharged from the first kiln boiler has a temperature of 100-110°C, and the kiln smoke discharged from the second kiln boiler has a temperature of 80-90°C.

3. The low temperature waste heat flash and binary combined cycle power generation system of claim 1, wherein, The waste heat gas temperature of the first kiln boiler absorbing the first rotary kiln structure and the second kiln boiler absorbing the second rotary kiln structure is 400-500°C.

4. The low temperature waste heat flash and binary combined cycle power generation system of claim 1, wherein, The steam discharged from the first gas outlet end of the first kiln boiler is steam with a pressure of 2.16 MPa and a temperature of 340°C.

5. The low temperature waste heat flash and binary combined cycle power generation system of claim 1, wherein, The steam discharged from the first gas outlet end of the second kiln boiler is steam with a pressure of 1.75 MPa and a temperature of 328°C, and the steam discharged from the second gas outlet end of the second kiln boiler is steam with a pressure of 0.25 MPa and a temperature of 188°C.

6. The low temperature waste heat flash and binary combined cycle power generation system of claim 1, wherein, The steam discharged from the fourth gas outlet end of the second kiln boiler is steam with a pressure of 2.16 MPa and a temperature of 340°C.

7. The low temperature waste heat flash and binary combined cycle power generation system of claim 1, wherein, The steam discharged from the gas outlet end of the first flash evaporator is steam with a pressure of 0.85 MPa and a temperature of 177°C.

8. The low temperature waste heat flash and binary combined cycle power generation system of claim 1, wherein, The steam discharged from the gas outlet end of the second flash evaporator is steam with a pressure of 0.15 MPa and a temperature of 127°C.

9. The low temperature waste heat flash and binary combined cycle power generation system of claim 1, wherein, Cooling water towers are arranged on the first condenser and the second condenser.

10. The cryogenic waste heat flash and binary hybrid power generation system of claim 1, wherein, A speed reducer is further arranged between the first steam turbine and the first generator.

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