System for producing nano calcium carbonate by utilizing kiln tail gas waste heat
By designing a system that uses the waste heat of the kiln exhaust gas to heat water, the problem of the failure to effectively utilize the high-temperature exhaust gas of the lime kiln is solved, and the cost of nano calcium carbonate production is reduced and the efficiency of sewage treatment is improved.
Patent Information
- Application Number
- CN202422228072.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-11
- Publication Date
- 2025-06-24
- Estimated Expiration
- 2034-09-11
AI Technical Summary
In the prior art, the high-temperature exhaust gas generated by the lime kiln cannot be effectively utilized, resulting in waste of heat and increased load on the sewage treatment station. At the same time, a large amount of high-temperature steam is required in the production process of nano calcium carbonate, resulting in high production costs.
A system is designed to produce nano calcium carbonate using the waste heat of the kiln exhaust gas. By connecting the exhaust gas outlet of the lime kiln with the air inlet of the heat exchanger, the heated water is heated using the heat energy of the exhaust gas, and the heated water is transported to the nano calcium carbonate production system through a circulating water pump and a hot water delivery pump.
The system effectively utilizes the waste heat of the kiln exhaust gas, reduces the demand for high-temperature steam by nano calcium carbonate, reduces the load and production costs of the sewage treatment plant, and improves the efficiency of the sewage treatment plant.
Smart Images
Figure CN223020912U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of heat energy recovery, and particularly relates to a system for producing nano calcium carbonate by using the waste heat of kiln tail gas. Background Technique
[0002] The lime kiln generates a large amount of high-temperature tail gas with a temperature of 250-350°C. The current treatment method is to directly send it to the next process after washing in a scrubber, and the waste heat sewage generated by washing goes to the sewage treatment station. This not only causes heat waste but also increases the load of the sewage treatment station. During the production process of nano calcium carbonate, a large amount of hot water is required. Currently, the hot water mainly comes from the heating of high-temperature steam, resulting in high production costs. Summary of the Invention
[0003] In view of the above problems in the prior art, the utility model provides a system for producing nano calcium carbonate by using the waste heat of kiln tail gas. The technical solution is as follows: It includes a lime kiln. The exhaust gas outlet of the lime kiln is connected to the intake port of a heat exchanger. The outlet of the heat exchanger is connected to the intake port of a scrubber. One water outlet of a circulating water tank is connected to the circulating water inlet of the heat exchanger through a circulating water pump. The circulating water outlet of the heat exchanger is connected to one water inlet of the circulating water tank. The other water outlet of the circulating water tank is connected to the nano calcium carbonate production system through a hot water delivery pump.
[0004] As a preferred solution, a washing water pipeline is connected to the top of the scrubber. The sewage outlet of the scrubber is connected to the sewage treatment station, and the exhaust gas outlet of the scrubber is connected to the tail gas treatment system.
[0005] As a preferred solution, the other water inlet of the circulating water tank is connected to a process water pipeline.
[0006] As a preferred solution, a liquid level gauge is arranged on the circulating water tank, and the liquid level gauge transmits the liquid level data to the control system.
[0007] As a preferred solution, a temperature sensor is arranged on the circulating water tank, and the temperature sensor transmits the water temperature data to the control system.
[0008] Advantages of the Utility Model
[0009] This system uses the heat energy of the high-temperature tail gas generated by the lime kiln to heat water for producing nano calcium carbonate, reducing the demand for high-temperature steam for nano calcium carbonate, while reducing the load of the sewage treatment plant, improving the efficiency of the sewage treatment plant, effectively controlling the production cost of nano calcium carbonate, and making reasonable use of waste heat resources. Brief Description of the Drawings
[0010] Figure 1 It is a schematic diagram of the overall structure of the utility model.
[0011] In the figure: 1, lime kiln; 2, heat exchanger; 3, circulation water tank; 4, circulation water pump; 5, process water pipeline; 6, hot water delivery pump; 7, nano calcium carbonate production system; 8, scrubbing tower; 9, sewage treatment station; 10, tail gas treatment system; 11, washing water pipeline; 12, liquid level gauge; 13, temperature sensor. Specific embodiments
[0012] The present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.
[0013] Embodiment
[0014] As Figure 1 A system for producing nano calcium carbonate by using the waste heat of kiln tail gas as shown, comprising a lime kiln 1, the exhaust gas outlet of the lime kiln 1 is connected to the intake port of the heat exchanger 2, the outlet of the heat exchanger 2 is connected to the intake port of the scrubbing tower 8, one of the water outlets of the circulation water tank 3 is connected to the circulation water inlet of the heat exchanger 2 through the circulation water pump 4, the circulation water outlet of the heat exchanger 2 is connected to one of the water inlets of the circulation water tank 3, and the other water outlet of the circulation water tank 3 is connected to the nano calcium carbonate production system 7 through the hot water delivery pump 6.
[0015] Furthermore, the top of the scrubbing tower 8 is connected to the washing water pipeline 11, the sewage outlet of the scrubbing tower 8 is connected to the sewage treatment station 9, and the exhaust gas outlet of the scrubbing tower 8 is connected to the tail gas treatment system 10.
[0016] Furthermore, the other water inlet of the circulation water tank 3 is connected to the process water pipeline 5.
[0017] Furthermore, a liquid level gauge 12 is provided on the circulation water tank 3, and the liquid level gauge 12 transmits the liquid level data to the control system.
[0018] Furthermore, a temperature sensor 13 is provided on the circulation water tank 3, and the temperature sensor 13 transmits the water temperature data to the control system.
[0019] With the above system, its operation process is as follows: The high-temperature tail gas generated by the lime kiln 1 is transported to the heat exchanger 2 to exchange heat with production water. After heat exchange, the tail gas is transported to the washing tower 8 for washing, the waste gas is transported to the tail gas treatment system 10 for treatment, and the wastewater is transported to the sewage treatment plant 9 for treatment; The production water in the heat exchanger 2 returns to the circulation water tank 3 after heat exchange and is repeatedly heated until the temperature reaches the specified temperature of the temperature sensor 13. Then, the control system starts the hot water delivery pump 6 to transport it to the nano-calcium carbonate production system for use. When the water level in the circulation water tank 3 is lower than the lowest water level, the liquid level gauge 12 sends data to the control system, and the control system opens the process water pipeline 5 to replenish water into the circulation water tank 3. When the water level is at the highest water level, the control system closes the process water pipeline 5.
Claims
1. A system for producing nano calcium carbonate using waste heat from kiln exhaust, comprising a lime kiln (1), characterized in that: The exhaust gas outlet of the lime kiln (1) is connected to the air inlet of the heat exchanger (2), the air outlet of the heat exchanger (2) is connected to the air inlet of the washing tower (8), one of the water outlets of the circulating water tank (3) is connected to the circulating water inlet of the heat exchanger (2) through a circulating water pump (4), the circulating water outlet of the heat exchanger (2) is connected to one of the water inlets of the circulating water tank (3), and the other water outlet of the circulating water tank (3) is connected to the nano calcium carbonate production system (7) through a hot water delivery pump (6).
2. A system for producing nano calcium carbonate using waste heat from kiln tail gas according to claim 1, characterized in that: The top of the washing tower (8) is connected to a washing water pipeline (11), the sewage outlet of the washing tower (8) is connected to a sewage treatment station (9), and the exhaust gas outlet of the washing tower (8) is connected to an exhaust gas treatment system (10).
3. The system for producing nano calcium carbonate using waste heat from kiln tail gas according to claim 1, characterized in that: Another water inlet of the circulating water tank (3) is connected to the process water pipeline (5).
4. A system for producing nano calcium carbonate using waste heat from kiln tail gas according to claim 1, characterized in that: The circulating water tank (3) is provided with a liquid level meter (12), and the liquid level meter (12) transmits liquid level data to a control system.
5. The system for producing nano calcium carbonate using waste heat from kiln tail gas according to claim 1, characterized in that: The circulating water tank (3) is provided with a temperature sensor (13), and the temperature sensor (13) transmits water temperature data to a control system.