Ammonium chloride mother liquor heat exchange cooling system
By designing an ammonium chloride mother liquor heat exchange and cooling system including a pre-cooling heat exchanger, a master exchanger and a pre-cooling external cooler, the liquid-liquid heat exchange method is adopted, and the cooling capacity of the cold crystallization system and the frozen water is used to solve the problem of low cooling efficiency of ammonium chloride mother liquor, achieving the effect of efficient cooling and energy consumption reduction.
Patent Information
- Application Number
- CN202420373734.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-02-28
- Publication Date
- 2025-02-28
- Estimated Expiration
- 2034-02-28
AI Technical Summary
In the production of soda ash with the combined alkali method, when the ammonium chloride mother liquor is heat exchanged and cooled with the circulating water through the mother liquor heat exchanger, the cooling efficiency is low, resulting in an increase in energy consumption and affecting the stability of the production system.
An ammonium chloride mother liquor heat exchange and cooling system was designed, including a pre-cooling heat exchanger, a mother exchanger and a pre-cooling external cooler. The liquid-liquid heat exchanger is adopted to pre-cool the ammonia mother liquor. The mother exchanger and the pre-cooling external cooler are further cooled down, and the cooling efficiency of the cold crystallization system and the freezing effect of the frozen water are improved.
Through this system, the temperature of ammonium chloride mother liquor is reduced, the cooling efficiency of the heat exchange equipment is improved, energy consumption is reduced, and the stability of the production system is enhanced.
Smart Images
Figure CN222544199U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a cooling system, in particular to an ammonium chloride mother liquor heat exchange cooling system. Background Art
[0002] Lowering the temperature of ammonium chloride mother liquor in the production of soda ash by the combined alkali process is beneficial to the stability of the production system and energy conservation and consumption reduction. Heat exchange between the mother liquor heat exchanger and the circulating water is the main means of cooling. However, with the changes in production load and external temperature, the mother liquor heat exchange temperature of this method often fails to reach the expected cooling target. The cooling efficiency of the heat exchanger is low. With the increase of temperature and system load, the frequent dumping and use of cold water greatly increases the energy consumption of the equipment, increases the workload of workers, and at the same time, the excessive mother liquor temperature causes changes in the conditions of the production system, affecting the stability of production. Utility Model Content
[0003] In order to overcome the above-mentioned defects, the purpose of the utility model is to provide an ammonium chloride mother liquor heat exchange and cooling system to reduce energy consumption. Each heat exchange equipment adopts a liquid-liquid heat exchange method, which has high cooling efficiency and is conducive to the stability of the production system.
[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:
[0005] A heat exchange and cooling system for ammonium chloride mother liquor comprises a precooling heat exchanger, a mother exchanger and a precooling external cooler, wherein the ammonia I mother liquor outlet of the precooling heat exchanger is connected to the ammonia I mother liquor inlet of the mother exchanger, the cooling water inlet of the precooling heat exchanger is connected to a cooling water circulation system, the cooling water outlet of the precooling heat exchanger is connected to the cooling water circulation system via a gas ammonia heater, the cooling medium of the mother exchanger is mother II liquid, the mother exchanger is provided with a mother II liquid inlet and a mother II liquid outlet, the ammonia I mother liquor outlet of the mother exchanger is connected to the ammonia I mother liquor inlet of the precooling external cooler, the chilled water inlet of the precooling external cooler is connected to a chilled water tank via a liquid ammonia evaporator, the chilled water outlet of the precooling external cooler is connected to a chilled water tank, and the ammonia I mother liquor cooled by the precooling external cooler is sent to a cold crystallization system.
[0006] Preferably, the liquid ammonia inlet of the liquid ammonia evaporator is connected to the liquid ammonia spherical tank, and the gaseous ammonia outlet of the liquid ammonia evaporator is connected to the evaporation and absorption section via a gaseous ammonia heater.
[0007] Preferably, the mother II liquid inlet of the mother exchanger is connected to a cold mother II barrel, the mother II liquid in the cold mother II barrel comes from a cold precipitation crystallization system, and the mother II liquid after heat exchange in the mother exchanger is sent to the evaporation and absorption section to absorb ammonia.
[0008] Preferably, the precooling heat exchanger is a plate heat exchanger.
[0009] Preferably, the mother heat exchanger and the pre-cooling external cooler are shell and tube heat exchangers.
[0010] The positive and beneficial effects of the utility model:
[0011] 1. The utility model precools the ammonia I mother liquor in the precooling heat exchanger, reducing the cooling load of the subsequent mother exchanger and the precooling crystallization external cooler. The cooling medium of the mother exchanger is the mother II liquid, which gradually takes away the heat of the ammonia I mother liquor. Moreover, the mother II liquid comes from the crystallization system, and the cooling capacity is fully utilized to reduce energy consumption. Then, the temperature of the ammonia I mother liquor is further reduced by chilled water in the precooling crystallization external cooler. The cooling medium of the precooling crystallization external cooler adopts chilled water, which has high cooling efficiency. In addition, the cooling water after heat exchange in the precooling heat exchanger is further used to heat the gas ammonia in the gas ammonia heater. The chilled water in the chilled water tank is sent to the chilled water tank after being supercooled by the liquid ammonia evaporator. The liquid ammonia is gasified by the liquid ammonia evaporator. The heat of each circulating medium is fully, effectively, reasonably and balancedly utilized, reducing energy consumption. The ammonium chloride mother liquor heat exchange and cooling system of the utility model reduces energy consumption. Each heat exchange equipment adopts a liquid-liquid heat exchange method, which has high cooling efficiency and is conducive to the stability of the production system. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 This is a schematic diagram of the structure of the ammonium chloride mother liquor heat exchange and cooling system of the utility model;
[0013] In the figure: 1-precooling heat exchanger, 2-mother exchanger, 3-precooling external cooler, 4-liquid ammonia evaporator, 5-chilled water storage tank, 6-gas ammonia heater, 7-cooling water circulation system. DETAILED DESCRIPTION
[0014] The utility model is further described below in conjunction with some specific embodiments.
[0015] Example 1
[0016] See also Figure 1, an ammonium chloride mother liquor heat exchange and cooling system, comprising a precooling heat exchanger 1, a mother exchanger 2 and a precooling external cooler 3, wherein the precooling heat exchanger 1 is a plate heat exchanger, and the mother exchanger 2 and the precooling external cooler 3 are shell and tube heat exchangers. The ammonia I mother liquor outlet of the precooling heat exchanger 1 is connected to the ammonia I mother liquor inlet of the mother exchanger 2, the cooling water inlet of the precooling heat exchanger 1 is connected to the cooling water circulation system 7, and the cooling water outlet of the precooling heat exchanger 1 is connected to the cooling water circulation system 7 through the gas ammonia heater 6. The gas ammonia absorbs the heat of the cooling water through the gas ammonia heater 6, reduces the cooling water temperature, facilitates the recycling of the cooling water, and reduces energy consumption. The ammonia I mother liquor after heat exchange in the precooling heat exchanger 1 is cooled to 34-36°C. The cooling medium of the mother exchanger 2 is mother II liquid. A mother II liquid inlet and a mother II liquid outlet are arranged on the mother exchanger 2. The mother II liquid inlet of the mother exchanger 2 is connected to a cold mother II barrel. The mother II liquid in the cold mother II barrel comes from the cold crystallization system. The mother II liquid after heat exchange in the mother exchanger 2 is sent to the evaporation and absorption section to absorb ammonia. The ammonia I mother liquid outlet of the mother exchanger 2 is connected to the ammonia I mother liquid inlet of the pre-cooling external cooler 3. The temperature of the ammonia I mother liquid after heat exchange in the mother exchanger 2 drops to 26-28°C. The chilled water inlet of the pre-cooling external cooler 3 is connected to the chilled water tank 5 via the liquid ammonia evaporator 4. The chilled water in the chilled water tank 5 is supercooled by the liquid ammonia evaporator 4 to further reduce the temperature of the chilled water and connected to the shell side of the pre-cooling external cooler 3 as a cooling medium. The tube side is ammonia I mother liquor. The liquid ammonia inlet of the liquid ammonia evaporator 4 is connected to the liquid ammonia spherical tank. The gas ammonia outlet of the liquid ammonia evaporator 4 is connected to the evaporation and absorption section via the gas ammonia heater 6. The chilled water outlet of the pre-cooling external cooler 3 is connected to the chilled water tank 5. The temperature of the ammonia I mother liquor after cooling by the pre-cooling external cooler 3 drops to 19-21°C and is sent to the cold crystallization system. The heat of each circulating medium is fully, effectively, reasonably and balancedly utilized, reducing energy consumption and achieving high cooling efficiency.
[0017] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Other modifications or equivalent substitutions made to the technical solution of the utility model by ordinary technicians in this field should be included in the scope of the claims of the utility model as long as they do not depart from the spirit and scope of the technical solution of the utility model.
Claims
1. An ammonium chloride mother liquor heat exchange and cooling system, characterized in that: It includes a precooling heat exchanger, a mother exchanger and a precooling external cooler. The ammonia I mother liquor outlet of the precooling heat exchanger is connected to the ammonia I mother liquor inlet of the mother exchanger, the cooling water inlet of the precooling heat exchanger is connected to the cooling water circulation system, the cooling water outlet of the precooling heat exchanger is connected to the cooling water circulation system via a gas ammonia heater, the cooling medium of the mother exchanger is mother II liquid, the mother exchanger is provided with a mother II liquid inlet and a mother II liquid outlet, the ammonia I mother liquor outlet of the mother exchanger is connected to the ammonia I mother liquor inlet of the precooling external cooler, the chilled water inlet of the precooling external cooler is connected to the chilled water tank via a liquid ammonia evaporator, the chilled water outlet of the precooling external cooler is connected to the chilled water tank, and the ammonia I mother liquor cooled by the precooling external cooler is sent to a cold crystallization system.
2. The ammonium chloride mother liquor heat exchange and cooling system according to claim 1, characterized in that: The liquid ammonia inlet of the liquid ammonia evaporator is connected to the liquid ammonia spherical tank, and the gas ammonia outlet of the liquid ammonia evaporator is connected to the evaporation and absorption section through the gas ammonia heater.
3. The ammonium chloride mother liquor heat exchange and cooling system according to claim 1, characterized in that: The mother II liquid inlet of the mother exchanger is connected to the cold mother II barrel, the mother II liquid of the cold mother II barrel comes from the cold precipitation crystallization system, and the mother II liquid after heat exchange in the mother exchanger is sent to the evaporation and absorption section to absorb ammonia.
4. The ammonium chloride mother liquor heat exchange and cooling system according to claim 1, characterized in that: The precooling heat exchanger is a plate heat exchanger.
5. The ammonium chloride mother liquor heat exchange and cooling system according to claim 1, characterized in that: The mother heat exchanger and the pre-cooling external cooler are shell and tube heat exchangers.