Waste heat utilization system of rotary kiln
By installing flue gas heat exchangers and collectors on the rotary kiln, the waste heat from the kiln tail flue gas and kiln skin is recovered, solving the problem of high energy consumption in the rotary kiln and realizing energy-saving operation and full utilization of waste heat.
Patent Information
- Application Number
- CN202423235976.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-26
- Publication Date
- 2025-11-21
- Estimated Expiration
- 2034-12-26
AI Technical Summary
Existing rotary kilns suffer from heat loss due to direct contact between the kiln lining and the outside environment, and the waste heat from the kiln tail flue gas is not fully utilized, resulting in high energy consumption.
Design a rotary kiln waste heat utilization system, which recovers waste heat from the kiln tail flue gas through a flue gas heat exchanger, recovers waste heat from the kiln skin through a heat collector, and uses circulating water and air heaters to preheat primary air and supply external heat-using equipment.
This achieved energy-saving operation of the rotary kiln body, increased the temperature of the circulating water, expanded the scope of waste heat utilization, and reduced energy consumption.
Smart Images
Figure CN223580673U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a rotary kiln waste heat utilization system belongs to industrial kiln system technical field. BACKGROUND
[0002] Rotary kiln is the roasting or drying equipment commonly used in industrial production, and the kiln skin has a large outer surface area and a high temperature, and the kiln tail has a high exhaust gas temperature, so it is a device with high energy consumption in the production process, and therefore how to control the energy consumption of the rotary kiln plays a crucial role in reducing costs and increasing efficiency for enterprises.
[0003] The main links of heat loss of the rotary kiln are kiln body heat dissipation and kiln tail flue gas waste heat, the commonly used rotary kiln has a diameter of about 4m, and the length even exceeds 100m, so the equipment has a huge size, usually the kiln head and the kiln tail are provided with rainproof facilities, the kiln body length direction is limited by the site and the need for maintenance, and there is no closed enclosure structure, and the kiln skin temperature exceeds 100 DEG C, the kiln skin directly contacts outdoor atmosphere during the operation of the rotary kiln, and there is convection heat transfer and high-temperature radiation heat transfer, so a large amount of heat of the rotary kiln is lost, at the same time, the rotary kiln tail flue gas enters the chimney after passing through the kiln raw material preheating and flue gas treatment links and is discharged into the atmosphere, in order to prevent corrosion, the flue gas temperature is controlled to be above the acid dew point, and the exhaust gas temperature is greater than 110 DEG C, as a roasting or drying equipment, the water content in the flue gas is about 20% to 40%, and the flue gas has a large amount of waste heat, this part of flue gas waste heat has not been developed and utilized in large quantities, and the main reason is that the industrial hot water prepared by the flue gas waste heat has a low temperature, and there is no other suitable heat utilization process except for winter heating of the production auxiliary buildings. UTILIZATIONAL CONTENT
[0004] According to the defects in the prior art, the utility model solves the technical problem, provides a rotary kiln waste heat utilization system, can recover flue gas waste heat and rotary kiln skin waste heat at the same time, makes full use of rotary kiln waste heat, and realizes energy-saving operation of the rotary kiln body.
[0005] The rotary kiln waste heat utilization system, the rotary kiln, the rotary kiln head is equipped with a burner, the rotary kiln tail is connected with the gas inlet of the flue gas heat exchanger through a flue, the gas outlet of the flue gas heat exchanger is connected to the chimney through a flue, and the rotary kiln skin is equipped with a heat collector outside.
[0006] The water inlet of the flue gas heat exchanger is connected with a flue gas heat exchanger water inlet pipe, the water outlet of the flue gas heat exchanger is connected with a flue gas heat exchanger water outlet pipe, the flue gas heat exchanger water outlet pipe is connected with the water inlet of the heat collector, the water outlet of the heat collector is connected with a water supply main pipe, the water supply main pipe is connected with the water inlet of the air heater through an air heater water inlet pipe, and the water outlet of the air heater is connected with a backwater main pipe through an air heater water outlet pipe; the air heater can preheat the primary air entering the rotary kiln, so that the energy consumption of the rotary kiln is reduced; the air outlet of the air heater is connected with a fuel pipe and is connected with the burner; the backwater main pipe is communicated with the flue gas heat exchanger water inlet pipe, and a circulating water pump is arranged on the flue gas heat exchanger water inlet pipe and used for providing power for the circulating water.
[0007] The technical scheme of the utility model provides a rotary kiln waste heat utilization system, recycles the waste heat in the kiln tail flue gas through the flue gas heat exchanger, recycles the rotary kiln skin waste heat through the heat collector, improves the circulating water temperature, expands the use range, and heats the primary air used by the rotary kiln burner through the air heater, realizes the energy-saving operation of the rotary kiln body.
[0008] Preferably, the water supply main pipe is also connected with a heat using equipment water inlet pipe, and the backwater main pipe is connected with a heat using equipment water outlet pipe.
[0009] Preferably, the backwater main pipe is also connected with a water supplement pump, and the water supplement pump is connected with a water supplement tank.
[0010] Preferably, the flue gas heat exchanger is a column tube fin heat exchanger, flue gas flows through the outside of the column tube, circulating water flows through the inside of the column tube, the waste heat of flue gas is transferred to the circulating water through heat exchange, and the temperature of the circulating water is increased.
[0011] Preferably, the heat collector is a column tube heat exchanger, the heat collector is installed outside the rotary kiln skin in multiple groups, the outside of the column tube is the air heated by the high-temperature radiation of the rotary kiln skin, circulating water flows through the inside of the column tube, the heat of the rotary kiln skin is transferred to the circulating water through heat exchange, and the temperature of the circulating water is further increased.
[0012] Preferably, the air heater is a column tube fin heat exchanger, primary air flows through the outside of the column tube, and circulating water flows through the inside of the column tube; the air heater heats the primary air by using the heat of the circulating water, and realizes the self-use of the waste heat of the rotary kiln.
[0013] Preferably, the heat using equipment is one or more of a column tube heat exchanger and a plate type heat exchanger; the heat using equipment transfers the heat of the circulating water to an external heat using system, and realizes the recycling of the waste heat of the rotary kiln.
[0014] The rotary kiln waste heat utilization system has the beneficial effects that, compared with the prior art, the rotary kiln waste heat utilization system has the beneficial effects that, compared with the prior art,
[0015] The rotary kiln waste heat utilization system has the beneficial effects that, compared with the prior art, the rotary kiln waste heat utilization system has the beneficial effects that, compared with the prior art, BRIEF DESCRIPTION OF DRAWINGS
[0016] Figure 1 The rotary kiln waste heat utilization system has the beneficial effects that, compared with the prior art, the rotary kiln waste heat utilization system has the beneficial effects that, compared with the prior art,
[0017] Figure: 1, burner; 2, rotary kiln; 3, heat collector; 4, flue gas heat exchanger; 5, chimney; 6, flue gas heat exchanger inlet pipe; 7, circulating water pump; 8, flue gas heat exchanger outlet pipe; 9, water supplement pump; 10, water supplement tank; 11, heat using equipment; 12, heat using equipment outlet pipe; 13, heat using equipment inlet pipe; 14, backwater main pipe; 15, air heater outlet pipe; 16, water supply main pipe; 17, air heater inlet pipe; 18, air heater. DETAILED DESCRIPTION
[0018] The rotary kiln waste heat utilization system has the beneficial effects that, compared with the prior art, the rotary kiln waste heat utilization system has the beneficial effects that, compared with the prior art,
[0019] However, the description of the present application is only an embodiment of structural and functional description, and the scope of the present application is not limited by the embodiments described in the text.
[0020] For example, a plurality of embodiments can have various modifications and various forms, and it should be understood that the scope of the present application includes equivalents that can achieve the technical idea.
[0021] As Figure 1 shown, the present embodiment is realized by the following technical scheme: including rotary kiln 2, rotary kiln 2 head is provided with burner 1, rotary kiln 2 tail is connected with gas inlet of flue gas heat exchanger 4 through flue, and gas outlet of flue gas heat exchanger 4 is connected to chimney 5 through flue; Rotary kiln 2 kiln skin outside is sleeved with heat collector 3;
[0022] The water inlet of the flue gas heat exchanger 4 is connected with a flue gas heat exchanger water inlet pipe 6, the water outlet of the flue gas heat exchanger 4 is connected with a flue gas heat exchanger water outlet pipe 8, the water inlet of the heat collector 3 is connected with the flue gas heat exchanger water outlet pipe 8, the water outlet of the heat collector 3 is connected with a water supply main pipe 16, the water inlet of an air heater 18 is connected with the water supply main pipe 16 through an air heater water inlet pipe 17, the water outlet of the air heater 18 is connected with a water return main pipe 14 through an air heater water outlet pipe 15; the air heater 18 can preheat the primary air entering the rotary kiln 2, so as to reduce the energy consumption of the rotary kiln; the air outlet of the air heater 18 is connected with a fuel pipe and enters the burner 1 together; the water return main pipe 14 is communicated with the flue gas heat exchanger water inlet pipe 6, and a circulating water pump 7 is arranged on the flue gas heat exchanger water inlet pipe 6 and used for providing power for the circulating water.
[0023] In the embodiment, the water supply main pipe 16 is further connected with a heat using equipment water inlet pipe 13, and the water return main pipe 14 is connected with a heat using equipment water outlet pipe 12; the heat using equipment water inlet pipe 13 is connected with the water inlet of a heat using equipment 11, and the heat using equipment water outlet pipe 12 is connected with the water outlet of the heat using equipment 11.
[0024] The water return main pipe 14 is further connected with a water supplement pump 9, and the water supplement pump 9 is connected with a water supplement tank 10; the water supplement pump 9 provides water supplement and pressure maintaining for the water return main pipe 14, and the water supplement tank 10 is used for water supplement storage of the circulating water.
[0025] The flue gas heat exchanger 4 is a tube-fin heat exchanger, flue gas flows through the outside of the tubes, and the circulating water flows through the inside of the tubes; the heat of the flue gas is transferred to the circulating water through heat exchange, so that the temperature of the circulating water is increased; the heat collector 3 is a tube heat exchanger, and the shape of the heat collector 3 can be arc-shaped; the heat collector 3 is installed on the outer side of the rotary kiln 2 in multiple groups; the air heated by the high-temperature radiation of the rotary kiln skin flows through the outside of the tubes, and the circulating water flows through the inside of the tubes; the heat of the rotary kiln skin is transferred to the circulating water through heat exchange, so that the temperature of the circulating water is further increased; the air heater 18 is a tube-fin heat exchanger, the primary air flows through the outside of the tubes, and the circulating water flows through the inside of the tubes; the air heater 18 heats the primary air by using the heat of the circulating water, so that the waste heat of the rotary kiln is used; the heat using equipment 11 is a tube heat exchanger, one side of the tubes is the circulating water, and the other side is the heated medium; the heat using equipment 11 transfers the heat of the circulating water to the external heat using system, so that the waste heat of the rotary kiln is recycled and utilized.
[0026] The working process of the utility model is as follows:
[0027] The high-temperature flue gas discharged from the rotary kiln 2 is exchanged for low-temperature flue gas by the flue gas heat exchanger 4 and is discharged through the chimney 5; at the same time, the circulating water flows through the flue gas heat exchanger 4, the heat collector 3 and the water supply main pipe 16 in turn under the action of the circulating water pump 7, is exchanged for high-temperature circulating water, and then is branched in the water supply main pipe 16, one way flows into the air heater 18 through the air heater inlet pipe 17 to preheat the primary air, and then flows into the return water main pipe 14 through the air heater outlet pipe 15; the other way flows into the heat-using equipment 11 through the heat-using equipment inlet pipe 13, and then flows into the return water main pipe 14 through the heat-using equipment outlet pipe 12 to enter the circulation; when the circulating water in the circulating water pipeline is reduced, the make-up water pump 9 is opened to supplement the circulating water.
[0028] Of course, the above only is the preferred embodiment of the present application, and cannot be considered as limiting the scope of the embodiments of the present application. The present application is also not limited to the above examples, and the equivalent changes and improvements made by the ordinary skilled in the art within the essential scope of the present application shall be attributed to the patent coverage of the present application.
Claims
1. A rotary kiln waste heat utilization system, characterized by, It comprises a rotary kiln (2), the rotary kiln (2) is provided with a burner (1) at the kiln head, the rotary kiln (2) is connected to the gas inlet of a flue gas heat exchanger (4) through a flue at the kiln tail, the gas outlet of the flue gas heat exchanger (4) is connected to a chimney (5) through a flue; a heat collector (3) is sleeved outside the rotary kiln (2) skin; The water inlet of the flue gas heat exchanger (4) is connected to a flue gas heat exchanger water inlet pipe (6), the water outlet of the flue gas heat exchanger (4) is connected to a flue gas heat exchanger water outlet pipe (8), the flue gas heat exchanger water outlet pipe (8) is connected to the water inlet of the heat collector (3), the water outlet of the heat collector (3) is connected to a water supply main pipe (16), the water supply main pipe (16) is connected to the water inlet of an air heater (18) through an air heater water inlet pipe (17), the water outlet of the air heater (18) is connected to a return water main pipe (14) through an air heater water outlet pipe (15); the air outlet of the air heater (18) is connected to a fuel pipeline and is connected to the burner (1) together; the return water main pipe (14) is communicated with the flue gas heat exchanger water inlet pipe (6), and the flue gas heat exchanger water inlet pipe (6) is provided with a circulating water pump (7).
2. The rotary kiln waste heat utilization system according to claim 1, characterized in that, The water supply main pipe (16) is further connected to a heat using equipment water inlet pipe (13), the return water main pipe (14) is connected to a heat using equipment water outlet pipe (12), the heat using equipment water inlet pipe (13) is connected to the water inlet of a heat using equipment (11), and the heat using equipment water outlet pipe (12) is connected to the water outlet of the heat using equipment (11).
3. The rotary kiln waste heat utilization system according to claim 2, characterized in that, The return water main pipe (14) is further connected to a make-up water pump (9), and the make-up water pump (9) is connected to a make-up water tank (10).
4. The rotary kiln waste heat utilization system according to claim 1, characterized in that, The flue gas heat exchanger (4) is a tube-fin heat exchanger, flue gas flows through the outside of the tubes, and circulating water flows through the inside of the tubes.
5. The rotary kiln waste heat utilization system according to claim 1, characterized in that, The heat collector (3) is a tube heat exchanger, and the heat collector (3) is divided into multiple groups and installed outside the rotary kiln (2) skin, air heated by high-temperature radiation of the rotary kiln skin flows through the outside of the tubes, and circulating water flows through the inside of the tubes.
6. The rotary kiln waste heat utilization system according to claim 1, characterized in that, The air heater (18) is a tube-fin heat exchanger, primary air flows through the outside of the tubes, and circulating water flows through the inside of the tubes.
7. The rotary kiln waste heat utilization system according to claim 2, characterized in that, The heat using equipment (11) is one or more of a tube heat exchanger and a plate heat exchanger.