Cement kiln flue gas mineralization solid waste gypsum waste heat utilization and ammonia escape integrated treatment method
By using a reaction tower, an integrated heat pump device and an ammonia water recycling system in the process of cement kiln flue gas desulfurization and decarbonization, the problems of ammonia escape and heat recovery are solved, the effective capture of escaped ammonia and the recovery and utilization of heat are achieved, and the cost and the risk of equipment damage are reduced.
Patent Information
- Application Number
- CN202510914181.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-03
- Publication Date
- 2025-09-23
AI Technical Summary
In the existing technology, ammonia escape is serious during the desulfurization and decarbonization process of cement kiln flue gas, and the reaction heat and the heat of the kiln tail flue gas cannot be effectively recovered and utilized, resulting in equipment damage and heat waste.
A reaction tower, an integrated heat pump device, an ammonia dilution system and an ammonia reuse system are used to capture escaped ammonia through multi-layer water washing and secondary reuse systems, and to recover waste heat and reaction heat in the flue gas. This includes inputting ammonia into the liquid storage area, spraying ammonia in the spray area to contact with the flue gas for desulfurization and decarbonization, diluting the ammonia in the deammonification area for cooling, recovering waste heat with a heat pump device, and cooling and flash evaporation separation of ammonia in the secondary reuse system.
It achieves effective capture of escaped ammonia, reduces the ammonia content in the final clean flue gas, recovers reaction heat and heat from kiln tail gas, reduces material consumption and operating costs, and meets environmental protection requirements.
Smart Images
Figure CN120679319A_ABST
Abstract
Description
Technical Field
[0001] The present invention belongs to the field of environmental protection technology, and specifically relates to a method for utilizing waste heat from cement kiln flue gas mineralization solid waste gypsum and integrating the treatment of ammonia escape. Background Art
[0002] For a cement kiln production line with a daily output of 10,000 tons of clinker, the original flue gas at the end of the cement kiln is about 1 million m3 / h with a temperature of 110°C, containing about 20% CO2 by volume. If all the carbon dioxide at the end of the cement kiln is absorbed by the limestone-gypsum desulfurization tower mineralization solid waste gypsum technology, the saturated flue gas temperature at the outlet can reach 80°C. For the desulfurization and decarbonization of cement kiln flue gas, by adding ammonia and solid waste gypsum, the carbon capture process reacts with CO2 to produce calcium carbonate and ammonium sulfate. The reaction formula is as follows:
[0003] CO2+2NH3+CaSO4*2H2O==CaCO3+(NH4)2SO4
[0004] Unlike ammonia-based flue gas, cement kiln flue gas has a large volume (1 million m³), a high temperature (130°C), a CO₂ content exceeding 20% (290 g / m³), and a SO₂ content of approximately 300 mg / m³. The reaction volume differs by orders of magnitude from the SO₂ content in ammonia-based flue gas. If all the CO₂ in the flue gas were absorbed, a large amount of decarbonization would occur, an exothermic reaction with a high heat release of -117 kJ / mol. Furthermore, due to the enormous amount of desulfurization and decarbonization required, the amount of ammonia required would be 1,000 times greater than that of ammonia-based flue gas, leading to significant ammonia escape. Furthermore, since a large amount of high-temperature flue gas passes through the reaction tower, the tower temperature would be too high without heat exchange, exacerbating ammonia escape. Due to such high temperature and ammonia escape volume, if a conventional ammonia-based desulfurization system is designed to capture escaped ammonia, on the one hand, the outlet temperature will accumulate and the escape volume will gradually increase, and on the other hand, a large amount of heat will be wasted and cannot be reused. Therefore, a cement kiln flue gas mineralization solid waste gypsum waste heat utilization and ammonia escape integrated treatment method is designed to capture the escaped ammonia while recovering the waste heat and reaction heat in the flue gas.
[0005] In actual production, it is found that when the capture rate of CO2 reaches 60%, the volume fraction of ammonia in the outlet gas phase reaches 4%, and the outlet temperature can reach 60°C; when the capture rate reaches more than 90%, the volume fraction of ammonia in the outlet gas phase reaches 10%, and the outlet temperature can reach more than 80°C. If the traditional ammonia desulfurization treatment is used, on the one hand, the high temperature will damage the relevant equipment, and on the other hand, a huge amount of ammonia will escape under high temperature conditions, which cannot be disposed of by water washing alone, resulting in the inability to use similar methods as the ammonia desulfurization to achieve effective treatment. Summary of the Invention
[0006] The purpose of the present invention is to provide a method for utilizing waste heat from cement kiln flue gas mineralization solid waste gypsum and integrating treatment of ammonia escape, so as to overcome the technical problems in the prior art of integrated desulfurization and decarbonization devices, such as serious ammonia escape, inability to capture escaped ammonia by simple water washing, and inability to effectively recycle reaction heat and kiln tail flue gas heat.
[0007] The method for utilizing waste heat from mineralized solid waste gypsum and integrated treatment of ammonia escape from cement kiln flue gas comprises a treatment system including a reaction tower, an integrated heat pump device, an ammonia dilution system and an ammonia recycling system. The reaction tower is divided into a liquid storage area, a spraying area and a deammonification area from bottom to top. The method for utilizing waste heat from mineralized solid waste gypsum and integrated treatment of ammonia escape from cement kiln flue gas comprises: inputting ammonia water into the liquid storage area, inputting cement kiln flue gas into the lower part of the spraying area, and the ammonia water in the liquid storage area is sprayed downward from the first spraying device at the upper part of the spraying area through a pipeline, and contacts with the input cement kiln flue gas to achieve desulfurization and decarbonization. The spraying area A sieve plate device that only allows the gas phase to pass through is provided between the deamination zone and the deamination zone. A second spray device is provided on the top of the deamination zone. The ammonia dilution system sprays low-temperature, low-concentration dilute ammonia water downward through the second spray device. The dilute ammonia water contacts the flue gas that passes through the sieve plate device to achieve cooling and deammonification of the flue gas, and forms medium-temperature and high-concentration ammonia water on the sieve plate device. The medium-temperature and high-concentration ammonia water recovers waste heat through the heat pump integrated device to form low-temperature and high-concentration ammonia water. Part of the low-temperature and high-concentration ammonia water is transported to the ammonia dilution system to prepare low-temperature and low-concentration ammonia water, and the other part is returned to the liquid storage area through the ammonia reuse system for reuse.
[0008] Preferably, the ammonia water reuse system includes a primary reuse system, the primary reuse pipe of the primary reuse system and the ammonia water inlet pipe of the ammonia water dilution system are both connected to the output end of the heat pump integrated device, the primary reuse pipe is provided with a first flow controller that controls the flow rate in the ammonia water inlet pipe, the outlet of the primary reuse pipe is connected to the liquid storage area, the liquid storage area is also connected to a liquid ammonia pipe for inputting liquid ammonia, and the liquid ammonia pipe is provided with a second flow controller that controls the flow rate in the primary reuse pipe.
[0009] Preferably, the ammonia water reuse system also includes a secondary reuse system, which includes a primary deammoniation pipe, a flash tank, a reuse heat exchanger and a secondary reuse pipe. The flue gas after the reaction is transported from the top of the reaction tower through the secondary reuse pipe. The secondary reuse pipe is connected to the liquid storage area or the lower part of the spraying area of the reaction tower through the reuse heat exchanger and the flash tank. The reuse heat exchanger exchanges heat between the flue gas after the reaction and the outside world to achieve flue gas cooling. The flash tank separates the gas and liquid, and the separated ammonia-containing liquid is reused through the secondary reuse pipe.
[0010] Preferably, the integrated heat pump device includes an absorber, a heat exchanger, a heat pump generator, a condenser and an evaporator as well as their ancillary equipment. The medium-temperature and high-concentration ammonia water is respectively transported to the heat pump generator and the evaporator in proportion. In the heat pump generator, the medium-temperature and high-concentration ammonia water is heat-exchanged with a concentrated lithium bromide solution and then cooled to a low-temperature and high-concentration ammonia water and outputted. In the evaporator, the medium-temperature and high-concentration ammonia water is heat-exchanged with condensed water and then cooled to a low-temperature and high-concentration ammonia water and outputted.
[0011] Preferably, the water vapor generated by the evaporator is transported to the absorber, where the concentrated solution of lithium bromide absorbs the water vapor and releases heat to form a dilute solution of lithium bromide. The released heat heats the water into high-temperature hot water which is discharged to realize waste heat recovery.
[0012] Preferably, the dilute lithium bromide solution is cooled by heat exchange with the concentrated lithium bromide solution output by the heat pump generator through a heat pump heat exchanger, and is decompressed by a pressure reducing valve and enters the heat pump generator in the low-pressure area. The dilute lithium bromide solution is heated by the medium-temperature and high-concentration ammonia water entering the heat pump generator to generate refrigerant steam, causing the dilute lithium bromide solution to be concentrated into a concentrated lithium bromide solution. The concentrated lithium bromide solution is then transported by a solution pump through the heat pump heat exchanger and re-enters the absorber.
[0013] Preferably, the integrated heat pump device inputs the medium-temperature and high-concentration ammonia water on the sieve plate device through the absorption liquid extraction pump and the absorption liquid pipe, and outputs the low-temperature and high-concentration ammonia water through the low-temperature ammonia extraction pump; the top surface of the sieve plate device is inclined, and the inlet of the absorption liquid pipe is located on the lower side of the top surface of the sieve plate device.
[0014] Preferably, the ammonia dilution system includes an ammonia dilution tank, a process water pipe, an ammonia inlet pipe and a spray pipe. The low-temperature and high-concentration ammonia water is input into the ammonia dilution tank through the ammonia inlet pipe, and the process water pipe inputs process water into the ammonia dilution tank, thereby diluting the low-temperature and high-concentration ammonia water with water to form low-temperature and low-concentration ammonia water, and the low-temperature and low-concentration ammonia water is transported to the second spray device through the spray pipe.
[0015] Preferably, there are multiple first spray devices from top to bottom, and each first spray device is connected to the liquid storage area through a corresponding circulation nozzle and a corresponding circulation pump. The liquid storage area is also connected to a production pipe, and a production pump is provided on the production pipe.
[0016] The advantages of the present invention are as follows: 1. The present invention sets up a deammoniation zone on the reaction tower to remove ammonia by water washing, and at the same time combines it with a secondary recycling system to perform heat exchange and flash separation again to achieve secondary deammoniation of the flue gas. This effectively captures the escaped ammonia, and the capture effect is significantly better than that of the existing technology. By recovering ammonia by cooling and flash evaporation for the second time after the primary recovery, the amount of liquid ammonia recovered is increased by about 1 / 3 compared to the usual amount. While all the ammonia is recovered, the ammonia content of the final clean flue gas is guaranteed to meet the discharge standard. This prevents the discharge ammonia content from exceeding the standard due to fluctuations in the process section.
[0017] 2. The present invention uses a set of treatment methods to use the desulfurization tower to solve the ammonia escape problem after desulfurization, decarbonization and mineralization, the mineralization CO2 reaction heat and the heat recovery in the raw flue gas of the cement kiln. It not only solves the environmental protection problem, but also realizes heat recovery under the premise of saving investment.
[0018] 3. To address ammonia escape caused by excessively high flue gas temperatures, the present invention reduces flue gas temperature through multi-layer water washing in the spray zone and secondary water washing in the deammonification zone. The high-concentration ammonia water produced by the secondary water washing and deammonification process is then transported to the integrated heat pump unit, effectively recovering the waste heat. The low-temperature, high-concentration ammonia water from this waste heat can then be used to replenish the ammonia solutions in the primary and secondary water washes, enabling the reuse of the low-temperature ammonia water.
[0019] 4. In the present invention, the ammonia water captured by water washing and deammonification and the ammonia water captured by flash separation and separation are respectively recycled through a primary reuse system and a secondary reuse system to achieve effective recycling of the ammonia water; by recycling the process water that absorbs the escaped ammonia and continuously enriching it, a high-concentration, low-temperature, and high-concentration ammonia water is finally obtained, and it is reused in the mineralization reaction, thereby reducing material consumption and operating costs.
[0020] 5. The present invention promptly delivers the high-concentration ammonia water produced by the secondary water washing and deammonification to the heat pump integrated device. Under the premise of recycling lithium bromide and water, the heat pump integrated device utilizes the low-quality heat in the medium-temperature high-concentration ammonia water to improve the quality, and reasonably recovers the reaction heat and the waste heat of the kiln tail flue gas. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] Figure 1 This is a system flow chart of the present invention's method for utilizing waste heat from cement kiln flue gas mineralization solid waste gypsum and integrating treatment of ammonia escape.
[0022] Figure 2 This is a system flow chart of the heat pump integrated device in the present invention. DETAILED DESCRIPTION
[0023] The specific implementation methods of the present invention will be further explained in detail below through the description of embodiments with reference to the accompanying drawings, so as to help those skilled in the art to have a more complete, accurate and in-depth understanding of the inventive concept and technical solution of the present invention.
[0024] like Figure 1-Figure 2As shown, the present invention provides a method for utilizing waste heat from mineralized solid waste gypsum in cement kiln flue gas and integrating ammonia escape treatment. The treatment system adopted includes a reaction tower, an integrated heat pump device, an ammonia water dilution system and an ammonia water reuse system. The reaction tower is divided into a liquid storage area, a spraying area and a deammonification area from bottom to top. The method for utilizing waste heat from mineralized solid waste gypsum in cement kiln flue gas and integrating ammonia escape treatment includes: inputting ammonia water into the liquid storage area, inputting cement kiln flue gas into the lower part of the spraying area, and the ammonia water in the liquid storage area is sprayed downward from the first spraying device at the upper part of the spraying area through a pipeline, and contacts with the input cement kiln flue gas to achieve desulfurization and decarbonization. A sieve plate device that only allows the gas phase to pass through is provided between the spraying area and the deammonification area. A second spray device is provided on the top of the deammonification area. The ammonia dilution system sprays low-temperature, low-concentration dilute ammonia water downward through the second spray device. The dilute ammonia water contacts the flue gas that passes through the sieve plate device to achieve cooling and deammonification of the flue gas, and forms medium-temperature and high-concentration ammonia water on the sieve plate device. The medium-temperature and high-concentration ammonia water recovers waste heat through the heat pump integrated device to form low-temperature and high-concentration ammonia water. Part of the low-temperature and high-concentration ammonia water is transported to the ammonia dilution system to prepare low-temperature and low-concentration ammonia water, and the other part is returned to the liquid storage area through the ammonia reuse system for reuse.
[0025] The ammonia water reuse system includes a primary reuse system. The primary reuse pipe of the primary reuse system and the ammonia water inlet pipe of the ammonia water dilution system are both connected to the output end of the heat pump integrated device. The primary reuse pipe is provided with a first flow controller that controls the flow rate in the ammonia water inlet pipe. The outlet of the primary reuse pipe is connected to the liquid storage area. The liquid storage area is also connected to a liquid ammonia pipe for inputting liquid ammonia. The liquid ammonia pipe is provided with a second flow controller that controls the flow rate in the primary reuse pipe.
[0026] To ensure ammonia balance in the deammonification zone, a stable flow rate to the ammonia dilution tank is required. Therefore, a first flow controller is installed on the primary return pipe. To ensure ammonia balance in the liquid storage area, a second flow controller is installed on the liquid ammonia pipe. The flow rate of ammonia return in the primary return pipe controls the valve opening of the second flow controller, thereby controlling the amount of liquid ammonia added.
[0027] The calculation formula for the control implemented by the first flow controller and the second flow controller (taking the ammonia recycling pipeline to control the amount of high-concentration ammonia added to the ammonia dilution tank as an example) is as follows:
[0028]
[0029] Among them, V1 is the target valve opening; V0 is the current valve opening; F e is the difference between the target flow and the current flow; K p 、T d and T s is an adjustable parameter, K p 、T d and T sIt is set according to user needs, and the target flow rate is determined based on the flow detection result of another pipeline.
[0030] The ammonia recycling system also includes a secondary recycling system, which includes a primary deamination pipe, a flash tank, a recycling heat exchanger, and a secondary recycling pipe. The secondary recycling pipe transports the reacted flue gas from the top of the reaction tower. The secondary recycling pipe is connected to the liquid storage area or the lower part of the spray zone of the reaction tower via the recycling heat exchanger and the flash tank. The recycling heat exchanger cools the reacted flue gas by exchanging heat with the outside world, reducing the flue gas temperature to 30°C. The flash tank separates the gas and liquid, and the separated ammonia-containing liquid is recycled through the secondary recycling pipe. The ammonia content of the separated gas is reduced to less than 5ppm. In the embodiment, the secondary recycling system can recover approximately 50kg / h of liquid ammonia.
[0031] The integrated heat pump device includes an absorber, a heat exchanger, a heat pump generator, a condenser, an evaporator and its ancillary equipment. The medium-temperature and high-concentration ammonia water is transported to the heat pump generator and the evaporator respectively in proportion. In the heat pump generator, the medium-temperature and high-concentration ammonia water is heat-exchanged with the concentrated lithium bromide solution and then cooled to low-temperature and high-concentration ammonia water and output. In the evaporator, the medium-temperature and high-concentration ammonia water is heat-exchanged with the condensed water and then cooled to low-temperature and high-concentration ammonia water and output.
[0032] In the evaporator, water vapor generated in the high-pressure area due to heat exchange with medium-temperature and high-concentration ammonia water is transported to the absorber. In the absorber, the concentrated solution of lithium bromide absorbs water vapor and releases heat to form a dilute solution of lithium bromide. The released heat heats the water into high-temperature hot water and is discharged to realize waste heat recovery.
[0033] The dilute lithium bromide solution is also a high-temperature solution. It is cooled by heat exchange with the concentrated lithium bromide solution output by the heat pump generator through the heat pump heat exchanger, and then enters the heat pump generator in the low-pressure area after being reduced in pressure through the pressure reducing valve. It is heated by the medium-temperature and high-concentration ammonia water entering the heat pump generator to generate refrigerant steam and cause the dilute lithium bromide solution to be concentrated into a concentrated lithium bromide solution. The concentrated lithium bromide solution is then transported by the solution pump through the heat pump heat exchanger and re-enters the absorber.
[0034] The refrigerant vapor is converted into condensed water through the condenser. The cooling water, which has absorbed heat during the condensation process, is then output and pressurized by a booster pump before being fed into the evaporator. The entire process consumes neither lithium bromide nor water vapor, effectively converting the heat of the medium-temperature, high-concentration ammonia solution into high-temperature hot water. This process can recover approximately 150 kg / h of ammonia. The high-temperature hot water after heat exchange in the absorber can be used for plant heating or converted to steam through flash evaporation for power generation.
[0035] The integrated heat pump unit inputs medium-temperature, high-concentration ammonia from the sieve plate assembly via an absorption liquid extraction pump and absorption liquid pipe, and outputs low-temperature, high-concentration ammonia via a low-temperature ammonia extraction pump. The top surface of the sieve plate assembly is inclined at an angle of 5°-10°, and the absorption liquid pipe inlet is located on the lower side of the sieve plate assembly's top surface.
[0036] The ammonia dilution system consists of an ammonia dilution tank, process water pipes, an ammonia inlet pipe, and a spray pipe. Low-temperature, high-concentration ammonia is fed into the ammonia dilution tank through the ammonia inlet pipe. The process water pipe then feeds process water into the ammonia dilution tank, diluting the low-temperature, high-concentration ammonia to form low-temperature, low-concentration ammonia. This low-temperature, low-concentration ammonia is then transported to a second spray device via a spray pipe. The low-temperature, low-concentration ammonia then re-enters the tower to absorb escaped ammonia and waste heat. In the deammonification zone, it interacts with the low-temperature, low-concentration ammonia gas in a countercurrent fashion. Mass and heat transfer lowers the temperature from 80°C to below 50°C, reducing the ammonia concentration in the flue gas from 20,000 ppm to below 200 ppm. Approximately 150 kg / h of liquid ammonia can be reused. In this system, the spray is powered by an absorption liquid addition pump located on the spray pipe. The process water pipe is connected to the process water tank via the process water pump.
[0037] Multiple first-level spray devices are located from top to bottom, each connected to the liquid storage area via a corresponding circulation nozzle and corresponding circulation pump. The liquid storage area is also connected to a production pipe equipped with a production pump. In the spray area, cement kiln flue gas passes through the desulfurization tower, decarbonization, and then the deammonification zone. The amount of low-temperature, low-concentration ammonia solution sprayed is adjusted based on the ammonia concentration in the flue gas. The amount of low-temperature, low-concentration ammonia solution is set to exceed the deammonification requirement to ensure that fugitive ammonia in the cement kiln flue gas is captured.
[0038] The present invention is described above by way of example in conjunction with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as various non-substantial improvements are made using the inventive concept and technical solution of the present invention, or the inventive concept and technical solution are directly applied to other occasions without improvement, they are all within the scope of protection of the present invention.
Claims
1. A method for utilizing waste heat from cement kiln flue gas mineralization solid waste gypsum and integrating treatment of ammonia escape, characterized by: The adopted disposal system includes a reaction tower, an integrated heat pump device, an ammonia dilution system and an ammonia recycling system. The reaction tower is divided into a liquid storage area, a spraying area and a deammonification area from bottom to top. The integrated disposal method for waste heat utilization of cement kiln flue gas mineralization solid waste gypsum and ammonia escape includes: inputting ammonia water into the liquid storage area, inputting cement kiln flue gas into the lower part of the spraying area, and the ammonia water in the liquid storage area is sprayed downward from the first spraying device at the upper part of the spraying area through a pipeline, and contacts with the input cement kiln flue gas to achieve desulfurization and decarbonization. There is a nozzle between the spraying area and the deammonification area that only allows the gas phase to pass through. The sieve plate device has a second spray device on the top of the deammonification area. The ammonia dilution system sprays low-temperature, low-concentration dilute ammonia water downward through the second spray device. The dilute ammonia water contacts the flue gas passing through the sieve plate device to achieve cooling and deammonification of the flue gas, and forms medium-temperature and high-concentration ammonia water on the sieve plate device. The medium-temperature and high-concentration ammonia water recovers waste heat through the heat pump integrated device to form low-temperature and high-concentration ammonia water. Part of the low-temperature and high-concentration ammonia water is transported to the ammonia dilution system to prepare low-temperature and low-concentration ammonia water, and the other part is returned to the liquid storage area through the ammonia reuse system for reuse.
2. The method for utilizing waste heat from cement kiln flue gas mineralization solid waste gypsum and integrating ammonia escape treatment according to claim 1 is characterized by: The ammonia water reuse system includes a primary reuse system. The primary reuse pipe of the primary reuse system and the ammonia water inlet pipe of the ammonia water dilution system are both connected to the output end of the heat pump integrated device. The primary reuse pipe is provided with a first flow controller that controls the flow rate in the ammonia water inlet pipe. The outlet of the primary reuse pipe is connected to the liquid storage area. The liquid storage area is also connected to a liquid ammonia pipe for inputting liquid ammonia. The liquid ammonia pipe is provided with a second flow controller that controls the flow rate in the primary reuse pipe.
3. The method for utilizing waste heat from cement kiln flue gas mineralization solid waste gypsum and integrating ammonia escape treatment according to claim 2 is characterized by: The ammonia water reuse system also includes a secondary reuse system, which includes a primary deammoniation pipe, a flash tank, a reuse heat exchanger and a secondary reuse pipe. The flue gas after the reaction is transported from the top of the reaction tower through the secondary reuse pipe. The secondary reuse pipe is connected to the liquid storage area or the lower part of the spray area of the reaction tower through the reuse heat exchanger and the flash tank. The reuse heat exchanger exchanges heat between the flue gas after the reaction and the outside world to achieve flue gas cooling. The flash tank separates the gas and liquid, and the separated ammonia-containing liquid is reused through the secondary reuse pipe.
4. The method for utilizing waste heat from cement kiln flue gas mineralization solid waste gypsum and integrating ammonia escape treatment according to claim 2 is characterized by: The integrated heat pump device includes an absorber, a heat exchanger, a heat pump generator, a condenser, an evaporator and its ancillary equipment. The medium-temperature and high-concentration ammonia water is transported to the heat pump generator and the evaporator respectively in proportion. In the heat pump generator, the medium-temperature and high-concentration ammonia water is heat-exchanged with the concentrated lithium bromide solution and then cooled to low-temperature and high-concentration ammonia water and output. In the evaporator, the medium-temperature and high-concentration ammonia water is heat-exchanged with the condensed water and then cooled to low-temperature and high-concentration ammonia water and output.
5. The method for utilizing waste heat from cement kiln flue gas mineralization solid waste gypsum and integrating treatment of ammonia escape according to claim 4 is characterized by: The water vapor generated by the evaporator is transported to the absorber. In the absorber, the concentrated solution of lithium bromide absorbs the water vapor and releases heat to form a dilute solution of lithium bromide. The released heat heats the water into high-temperature hot water and is discharged to realize waste heat recovery.
6. The method for utilizing waste heat from cement kiln flue gas mineralization solid waste gypsum and integrating ammonia escape treatment according to claim 4 is characterized by: The dilute lithium bromide solution is cooled by heat exchange with the concentrated lithium bromide solution output by the heat pump generator through the heat pump heat exchanger, and is reduced in pressure by the pressure reducing valve and enters the heat pump generator in the low-pressure area. Due to the heating by the medium-temperature and high-concentration ammonia water entering the heat pump generator, refrigerant steam is generated and the dilute lithium bromide solution is concentrated into a concentrated lithium bromide solution. The concentrated lithium bromide solution is then transported by the solution pump through the heat pump heat exchanger and re-enters the absorber.
7. The method for utilizing waste heat from cement kiln flue gas mineralization solid waste gypsum and integrating ammonia escape treatment according to claim 4 is characterized by: The heat pump integrated device inputs the medium-temperature and high-concentration ammonia water on the sieve plate device through the absorption liquid extraction pump and the absorption liquid pipe, and outputs the low-temperature and high-concentration ammonia water through the low-temperature ammonia extraction pump; the top surface of the sieve plate device is inclined, and the inlet of the absorption liquid pipe is located on the lower side of the top surface of the sieve plate device.
8. The method for utilizing waste heat from cement kiln flue gas mineralization solid waste gypsum and integrating ammonia escape treatment according to claim 2 is characterized by: The ammonia dilution system includes an ammonia dilution tank, a process water pipe, an ammonia inlet pipe and a spray pipe. The low-temperature and high-concentration ammonia water is input into the ammonia dilution tank through the ammonia inlet pipe, and the process water pipe inputs process water into the ammonia dilution tank, thereby diluting the low-temperature and high-concentration ammonia water with water to form low-temperature and low-concentration ammonia water. The low-temperature and low-concentration ammonia water is transported to the second spray device through the spray pipe.
9. The method for utilizing waste heat from cement kiln flue gas mineralization solid waste gypsum and integrating ammonia escape treatment according to claim 2, characterized in that: There are multiple first spraying devices from top to bottom, and each first spraying device is connected to the liquid storage area through a corresponding circulation nozzle and a corresponding circulation pump. The liquid storage area is also connected to a production pipe, and a production pump is provided on the production pipe.