Thermal radiation and heat collection ORC power generation system for cement kiln cylinder

Abstract

The utility model discloses a cement kiln cylinder thermal radiation heat collection ORC power generation system which comprises an ORC generator set and a cement kiln cylinder, the ORC generator set comprises an evaporator, a turbo-expansion all-in-one machine, a heat regenerator, a condenser and a working medium pump, and a C-shaped cylinder heat exchanger is arranged on the outer side of the cement kiln cylinder. One end of the C-shaped barrel heat exchanger is connected with a water inlet of the evaporator, the other end of the C-shaped barrel heat exchanger is connected with a condensed water supply of the condenser, and a water outlet of the evaporator is connected with the waste heat boiler through the circulating hot water pump. A heat source is provided for evaporation of the organic working medium, so that the radiant heat of the kiln cylinder is recycled and utilized; the C-shaped barrel heat exchanger is combined with the organic Rankine cycle system to generate electricity, so that the problem that replaced hot water or steam cannot be utilized due to seasons can be solved, and energy conservation, cost reduction and efficiency improvement are realized for enterprises.

Description

Technical Field

[0001] The utility model relates to the field of organic Rankine cycle power generation equipment, and particularly relates to a heat radiation collection ORC power generation system for a cement kiln cylinder body. Background Technique

[0002] During the calcination process of cement clinker, the temperature difference in each section is relatively large. The average temperature of the cylinder body in the burning section is the highest, at 300 - 350°C, and the length accounts for about 1 / 8 - 1 / 9 of the length of the rotary kiln cylinder body. The average surface temperature of the cylinder body in the decomposition zone and the exothermic reaction zone is 280 - 300°C, and the length accounts for about 1 / 2 of the length of the rotary kiln cylinder body.

[0003] The surface temperature of the cylinder body in the drying zone and the preheating zone is the lowest, with an average of 240 - 260°C, and its length accounts for about 1 / 5 of the length of the rotary kiln cylinder body.

[0004] Through the infrared scanning data measurement and analysis of the surface temperature of the rotary kiln cylinder body in the cement industry, it is found that the recovery and utilization of the radiant heat dissipation on the surface of the rotary kiln cylinder body in the current cement kiln industry at 250°C - 350°C is less. The heat dissipation on the surface of the rotary kiln cylinder body accounts for about 63% of the system surface heat dissipation, and the heat loss here is relatively concentrated and easy to recover, with great recovery economic value.

[0005] At present, most of the heat dissipation on the surface of cement rotary kilns in China has not been effectively recovered, resulting in extremely large heat energy losses. In view of this background, a heat recovery ORC power generation system for the radiant heat of the kiln cylinder body is developed to recover and generate electricity from the radiant heat dissipation on the surface of the rotary kiln cylinder body. Content of the Utility Model

[0006] The purpose of the utility model is to propose a heat radiation collection ORC power generation system for a cement kiln cylinder body in view of the fact that most of the heat dissipation on the surface of existing cement rotary kilns has not been effectively recovered and the heat energy loss is extremely large.

[0007] In order to achieve the above objectives, the utility model adopts the following technical solutions:

[0008] A heat radiation collection ORC power generation system for a cement kiln cylinder body includes an ORC power generation unit and a cement kiln cylinder body. The ORC power generation unit includes: an evaporator, a turbine-expander integrated machine, a recuperator, a condenser, and a working fluid pump. A C-shaped cylinder heat exchanger is arranged outside the cement kiln cylinder body. One end of the C-shaped cylinder heat exchanger is connected to the water inlet of the evaporator, and the other end is connected to the condensate water supply of the condenser. The water outlet of the evaporator is connected to a waste heat boiler through a circulating hot water pump;

[0009] Among them, low-temperature hot water is introduced into the C-shaped cylinder heat exchanger through condenser condensate to absorb radiant heat. After absorbing the radiant heat, the high-temperature hot water flows into the evaporator from the water inlet of the evaporator and exchanges heat with the low-temperature organic working fluid. The low-temperature hot water after heat exchange is sent to the waste heat boiler through a circulating hot water pump for waste heat recycling.

[0010] The high-temperature hot water exchanges heat with the low-temperature liquid organic working fluid in the evaporator. The low-temperature liquid organic working fluid evaporates into a high-temperature gaseous organic working fluid. The high-temperature gaseous organic working fluid drives the turbine expansion integrated machine to do work and generate electricity. After doing work, the temperature of the high-temperature gaseous organic working fluid decreases and enters the recuperator for preheating. Subsequently, it enters the condenser to exchange heat and condense with the circulating cooling water to form a liquid organic working fluid, which is sent to the recuperator through a working fluid pump to preheat with the high-temperature gaseous organic working fluid entering the recuperator after doing work. The preheated liquid organic working fluid enters the evaporator to exchange heat with the high-temperature hot water to form a closed-cycle power generation system.

[0011] As a further preference of the present invention, the inner side of the C-shaped cylinder heat exchanger is matched with the outer shape of the cement kiln cylinder and is closely attached.

[0012] As a further preference of the present invention, the C-shaped cylinder heat exchanger covers 2 / 3 of the side area of the cement kiln cylinder, and the remaining 1 / 3 of the side area of the cement kiln cylinder is used as an emergency maintenance and emergency heat dissipation and cooling notch for the cement kiln cylinder.

[0013] As a further preference of the present invention, the C-shaped cylinder heat exchanger includes a housing, a heat insulation layer, a reflective layer, and a heat exchange tube bundle layer. The heat insulation layer is arranged between the housing and the reflective layer. The reflective layer is arranged as a double-layer hollow structure, and the heat exchange tube bundle layer is arranged in the cavity of the reflective layer. Setting three layers can enable the hot water to evenly absorb the heat radiation of the kiln cylinder and better insulate the heat absorbed by the hot water through the heat insulation layer provided, reducing heat loss.

[0014] As a further preference of the present invention, the heat exchange tube bundle layer includes a number of heat absorption tubes and a number of header units. The number of heat absorption tubes is divided into several groups, and header units are respectively arranged at both ends of each group of heat absorption tubes. The header units are used to connect and fix the heat absorption tubes in groups.

[0015] As a further preference of the present invention, the header unit is arranged in an arc structure, and the header units at both ends of the heat exchanger are arranged alternately in sequence to improve the heat exchange efficiency.

[0016] As a further preference of the present invention, the surface of the heat absorption tube is coated with a high-temperature resistant radiation coating. Using the radiation coating can increase the radiation area of the heat exchange tube and improve the heat exchange effect. At the same time, it has heat storage stability and corrosion resistance.

[0017] As a further preference of the present utility model, the reflective layer is made of an anti-absorption material. The reflective layer includes a plate carrier and a reflector embedded in the plate carrier, and a high-temperature resistant heat reflective coating is applied on the plate carrier; the high-temperature resistant heat reflective coating can improve the diffuse reflection ability, enable the heat-absorbing back surface to also receive the reflected radiation energy, further increase the heat absorption area of the heat-absorbing tube, and can effectively recover the heat radiated outward from the surface of the cylinder body.

[0018] As a further preference of the present utility model, a steel skeleton is provided on the outer shell body, and the reflective layer is fixed on the steel skeleton. The steel skeleton is also the inner thermal insulation material protection plate of the outer shell body.

[0019] As a further preference of the present utility model, two circulating hot water pumps are provided and are arranged in parallel.

[0020] A cement kiln cylinder body heat radiation heat collection ORC power generation system proposed by the present utility model has the following beneficial effects compared with the prior art:

[0021] 1. The present utility model recovers and utilizes the radiant heat dissipation on the surface of the rotary kiln through the C-shaped cylinder heat exchanger, and provides a heat source for the evaporation of the organic working fluid, thereby realizing the recovery and utilization of the radiant heat of the kiln cylinder body;

[0022] 2. The present utility model can combine the C-shaped cylinder heat exchanger with the organic Rankine cycle system for power generation, which can avoid the problem that the hot water or steam displaced cannot be utilized due to seasons, and save energy, reduce costs and increase efficiency for enterprises;

[0023] 3. The whole system of the present utility model has high heat recovery efficiency, stable and reliable operation, and fast investment recovery;

[0024] 4. The heat exchange tubes in the C-shaped cylinder heat exchanger adopt spiral fin tubes and are arranged staggeredly. The fin tube has a high heat transfer coefficient, which greatly improves the absorption of the high-temperature heat generated by the kiln cylinder body 1;

[0025] 5. The ORC generator set is an integral separate skid, which is convenient for modification during the waste heat recovery of existing equipment, and the modification cost is small. Description of the Drawings

[0026] Figure 1 is the heat energy recovery route diagram of a cement kiln cylinder body heat radiation heat collection ORC power generation system related to the present utility model;

[0027] Figure 2 is the front view of the C-shaped cylinder heat exchanger;

[0028] Figure 3 is the side view of the C-shaped cylinder heat exchanger.

[0029] Meanings of the reference numerals in the drawings: 1. Cement kiln shell; 2. C-shaped shell heat exchanger; 21. Outer shell, insulation layer; 22. Heat exchange tube bundle layer; 23. Reflection layer; 24. Header unit; 3. Evaporator; 4. Turbine-expander integrated machine; 5. Regenerator; 6. Condenser; 7. Working fluid pump; 8. Circulating cooling water inlet; 9. Circulating cooling water outlet; 10. Circulating hot water pump; 11. Condensate water supply for condenser; 12. Waste heat boiler. Specific embodiments

[0030] The following provides a specific introduction to the present utility model in conjunction with the accompanying drawings and specific embodiments.

[0031] Currently, most of the existing heat radiation recovery of cement kiln shells is used for heating hot water in winter in office areas. However, the heat collection amount of the surface radiation heat recovery device of the rotary kiln shell involved in the present utility model is large in summer. During actual application, the hot water temperature is relatively high, reaching above 100 °C. It is impossible to consume the high-temperature hot water or steam, resulting in heat waste and the failure to effectively and fully utilize energy conservation. The surface radiation heat of the rotary kiln shell cannot be recovered and utilized normally.

[0032] Embodiment 1: In combination with Figure 1 , a heat radiation heat collection ORC power generation system for a cement kiln shell 1 includes an ORC power generation unit and a cement kiln shell 1. The ORC power generation unit includes: an evaporator 3, a turbine-expander integrated machine 4, a regenerator 5, a condenser 6, and a working fluid pump 7. A C-shaped shell heat exchanger 2 is arranged outside the cement kiln shell 1. One end of the C-shaped shell heat exchanger 2 is connected to the water inlet of the evaporator 3, and the other end is connected to the condensate water supply 11 for the condenser. The water outlet of the evaporator 3 is connected to the waste heat boiler 12 through a circulating hot water pump 10.

[0033] Among them, low-temperature hot water is introduced through the condensate water of the condenser into the C-shaped shell heat exchanger 2 for radiant heat absorption. The high-temperature hot water after absorbing radiant heat flows into the evaporator 3 from the water inlet of the evaporator 3 and exchanges heat with the low-temperature organic working fluid; the low-temperature hot water after heat exchange is sent into the waste heat boiler 12 through a circulating hot water pump 10 for waste heat recycling.

[0034] The high-temperature hot water exchanges heat with the low-temperature liquid organic working fluid in the evaporator 3. The low-temperature liquid organic working fluid evaporates into a high-temperature gaseous organic working fluid. The high-temperature gaseous organic working fluid drives the turbine-expander integrated machine 4 to perform work and generate electricity. After doing work, the temperature of the high-temperature gaseous organic working fluid decreases and enters the regenerator 5 for preheating. Subsequently, it enters the condenser 6 to exchange heat and condense with the circulating cooling water to form a liquid organic working fluid, which is sent into the regenerator 5 through the working fluid pump 7 to preheat with the high-temperature gaseous organic working fluid entering the regenerator 5 after doing work. The preheated liquid organic working fluid enters the evaporator 3 to exchange heat with the high-temperature hot water, forming a closed-cycle power generation system.

[0035] The inner side of the C-shaped cylinder heat exchanger 2 is matched with the outer shape of the cement kiln cylinder 1 and is closely attached; the C-shaped cylinder heat exchanger 2 covers 2 / 3 of the side area of the cement kiln cylinder 1, and the remaining 1 / 3 of the side area of the cement kiln cylinder 1 is used as an emergency repair and emergency heat dissipation and cooling notch for the cement kiln cylinder 1.

[0036] The C-shaped cylinder heat exchanger 2 includes a housing 21, a heat insulation layer, a reflection layer 23 and a heat exchange tube bundle layer 22. The heat insulation layer is arranged between the housing 21 and the reflection layer 23. The reflection layer 23 is arranged as a double-layer hollow structure, and the heat exchange tube bundle layer 22 is arranged in the cavity of the reflection layer 23; arranging 3 layers can enable the hot water to evenly absorb the heat radiation of the kiln cylinder and better insulate the heat absorbed by the hot water through the heat insulation layer provided, reducing heat loss. The heat exchange tube bundle layer 22 includes a number of heat absorption tubes and a number of header units 24. The number of heat absorption tubes is divided into several groups, and header units 24 are respectively arranged at both ends of each group of heat absorption tubes. The header units 24 are used to connect and fix the heat absorption tubes in groups; the header units are arranged as an arc structure, and the header units at both ends of the heat exchanger are arranged alternately in sequence to improve the heat exchange efficiency. The surface of the heat absorption tube is coated with a high-temperature radiation coating, and the high-temperature radiation coating is ZS-411 radiation coating. Using ZS-411 radiation coating can increase the radiation area of the heat exchange tube and improve the heat exchange effect, and at the same time has heat storage stability and corrosion resistance. The reflection layer is made of an anti-absorption material. The reflection layer includes a plate carrier and a reflector embedded in the plate carrier. The plate carrier is coated with a high-temperature heat reflection coating; the high-temperature heat reflection coating is ZS-233 high-temperature heat reflection coating, which can withstand a high temperature of 1800°C; the high-temperature heat reflection coating can improve the diffuse reflection ability, so that the back of the heat absorption also receives the reflected energy of the radiation, further increasing the heat receiving area of the heat absorption tube, and can effectively recover the heat radiated from the surface of the cylinder. A steel skeleton is arranged on the housing 21, and the reflection layer is fixed on the steel skeleton. The steel skeleton is also the heat insulation material protection plate inside the housing 21.

[0037] Two circulating hot water pumps 10 are provided and arranged in parallel to send the surplus warm water back to the waste heat boiler 12.

[0038] Working principle: Low-temperature hot water is introduced from the condensate of the original flue gas boiler power generation system into the C-shaped cylinder heat exchanger 2 located outside the cement kiln cylinder 1 for radiant heat absorption. The high-temperature hot water after absorbing the heat radiation is connected to the inlet of the evaporator 3 of the organic Rankine cycle power generation system through the hot water outlet pipe from the hot water outlet of the C-shaped cylinder heat exchanger for heat exchange with the low-temperature organic working medium R245fa; the low-temperature hot water after heat exchange is sent into the waste heat boiler 12 by the circulating hot water pump 10.

[0039] The organic working fluid is heated by a heat source in the evaporator 3 to become high-pressure working fluid vapor, then enters the turbine expander to drive the turbine to do work, and drives the generator to generate electricity. Subsequently, it enters the condenser 6 to be condensed into liquid working fluid, and then is pressurized by the working fluid pump 7 and enters the evaporator 3 again to form a cycle.

[0040] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the above embodiments do not limit the present invention in any form. Any technical solutions obtained by means of equivalent replacement or equivalent transformation fall within the protection scope of the present invention.

Claims

1. A heat radiation heat collection ORC power generation system for a cement kiln cylinder, comprising an ORC power generation unit and a cement kiln cylinder, wherein the ORC power generation unit includes: An evaporator, a turbine-expander integrated machine, a recuperator, a condenser and a working fluid pump, characterized in that a C-shaped cylinder heat exchanger is arranged outside the cement kiln cylinder, one end of the C-shaped cylinder heat exchanger is connected to the water inlet of the evaporator, and the other end is connected to the condensate water supply of the condenser. The water outlet of the evaporator is connected to a waste heat boiler through a circulating hot water pump; Among them, low-temperature hot water is introduced into the C-shaped cylinder heat exchanger through the condenser condensate to absorb radiant heat. After absorbing the radiant heat, the high-temperature hot water flows into the evaporator from the water inlet of the evaporator and exchanges heat with the low-temperature organic working fluid. The low-temperature hot water after heat exchange is sent into the waste heat boiler through a circulating hot water pump for waste heat recycling; The high-temperature hot water exchanges heat with the low-temperature liquid organic working fluid in the evaporator. The low-temperature liquid organic working fluid evaporates into a high-temperature gaseous organic working fluid. The high-temperature gaseous organic working fluid drives the turbine-expander integrated machine to do work and generate electricity. After doing work, the temperature of the high-temperature gaseous organic working fluid decreases and enters the recuperator for preheating. Subsequently, it enters the condenser to exchange heat and condense with the circulating cooling water to form a liquid organic working fluid, which is sent into the recuperator through the working fluid pump to preheat with the high-temperature gaseous organic working fluid entering the recuperator after doing work. The preheated liquid organic working fluid enters the evaporator to exchange heat with the high-temperature hot water to form a closed-cycle power generation system.

2. The ORC power generation system for collecting heat by thermal radiation of a cement kiln cylinder according to claim 1, wherein The inner side surface of the C-shaped cylinder heat exchanger matches the outer shape of the cement kiln cylinder and is closely attached.

3. The ORC power generation system for collecting heat by thermal radiation of the cement kiln cylinder according to claim 1, wherein, The C-shaped cylinder heat exchanger covers 2 / 3 of the side area of the cement kiln cylinder.

4. A cement kiln cylinder heat radiation heat collection ORC power generation system according to claim 1, characterized in that, The C-shaped cylinder heat exchanger includes a housing, a heat insulation layer, a reflective layer and a heat exchange tube bundle layer. The heat insulation layer is arranged between the housing and the reflective layer. The reflective layer is arranged as a double-layer hollow structure, and the heat exchange tube bundle layer is arranged in the cavity of the reflective layer.

5. The heat radiation heat collection ORC power generation system for a cement kiln cylinder according to claim 4, wherein, The heat exchange tube bundle layer includes a number of heat absorption tubes and a number of header units. The number of heat absorption tubes is divided into several groups. Header units are arranged at both ends of each group of heat absorption tubes, and the header units are used to connect and fix the heat absorption tubes in groups.

6. A cement kiln cylinder thermal radiation heat collection ORC power generation system according to claim 5, characterized in that, The header unit is arranged in an arc structure, and the header units at both ends of the heat exchanger are arranged alternately in sequence.

7. A cement kiln cylinder thermal radiation heat collection ORC power generation system according to claim 5, characterized in that, The surface of the heat absorption tube is coated with a high-temperature resistant radiation coating, and the heat absorption tube adopts a spiral fin tube and is arranged in a staggered manner.

8. A cement kiln cylinder thermal radiation heat collection ORC power generation system according to claim 4, characterized in that The reflective layer is made of an anti-absorption material. The reflective layer includes a plate carrier and a mirror embedded on the plate carrier. The plate carrier is coated with a high-temperature resistant heat reflective coating.

9. A cement kiln cylinder heat radiation heat collection ORC power generation system according to claim 4, characterized in that, A steel skeleton is arranged on the housing, and the reflective layer is fixed on the steel skeleton.

10. A cement kiln cylinder heat radiation heat collection ORC power generation system according to claim 1, characterized in that, Two circulating hot water pumps are provided and arranged in parallel.

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