Steam heat exchange air-conditioning refrigeration system for carbon calcined coke

Abstract

The utility model provides a carbon calcined coke steam heat exchange air-conditioning refrigeration system. The air-conditioning refrigeration system comprises a steam-producing water jacket heat exchange subsystem, a steam collection subsystem, an air-conditioning refrigeration subsystem and a water supply deoxygenation subsystem, the steam-producing water jacket heat exchange subsystem is connected with the steam collecting subsystem through an outlet steam pipeline; the output end of the steam collection subsystem is connected with the air-conditioning refrigeration subsystem through a lithium bromide unit steam pipeline; the output end of the steam collecting subsystem is connected with the water supply deoxygenization subsystem through a deoxygenization steam pipeline; wherein the air-conditioning refrigeration subsystem consists of a lithium bromide refrigerating unit, a condensed water pump, a cold water circulating pump and a user air-conditioning unit; the output end of the lithium bromide refrigerating unit is connected with the user air conditioner unit through a cold water supply pipeline. The output end of the user air conditioning unit is connected with the lithium bromide refrigerating unit through a cold water circulating pump and a cold water return pipeline; according to the utility model, the waste heat of the calcined coke of the calcining furnace can be utilized to produce high-quality steam, and meanwhile, the steam produced by the waste heat of the calcined coke is utilized to realize the effect of air-conditioning refrigeration.

Description

Technical Field

[0001] The present invention relates to the technical field of waste heat utilization, and more specifically, to a carbon calcined coke steam heat exchange air conditioning refrigeration system. Background Art

[0002] The aluminum carbon industry generally uses a pot calciner to process petroleum coke into prebaked anodes, which are used as anode materials in the aluminum smelting process of the electrolytic aluminum industry. Petroleum coke is calcined at a high temperature of 1200-1300℃ in the material tank of the pot calciner to remove moisture, volatiles and other chemical residues, increase the density and mechanical strength of the raw materials, and enhance the conductivity. Then, after subsequent crushing, kneading, roasting and other processes, the prebaked anode is finally formed.

[0003] The finished product after calcining in the calcining furnace material tank is called calcined coke. Due to the high temperature of calcined coke, the current production process arranges a water jacket under each material tank to cool the calcined coke. At present, the most commonly used form of water jacket is the jacketed heat exchanger, that is, the heat exchanger is made into a sandwich structure, and the calcined coke passes through the space surrounded by the inner wall of the sandwich. Cooling water flows between the inner wall and the outer wall of the sandwich to achieve the purpose of cooling the calcined coke. The circulating water is heated and then cooled by the cooling tower for recycling. This method does not utilize the waste heat, let alone the high-quality waste heat.

[0004] In addition, factories currently consume a certain amount of energy to provide air conditioning and cooling for buildings and workshops in summer. The main places are: first, office areas and shift dormitories require air conditioning and cooling in summer; second, some important production sites require air conditioning and cooling, such as the central control room; third, some electrical equipment rooms such as distribution rooms and transformer stations. Since electrical equipment dissipates a large amount of heat during operation, air conditioning and cooling are generally required to ensure the safe operation of the equipment. At present, air conditioning and cooling in factories generally use split air conditioners, which consume a lot of electricity.

[0005] As mentioned above, on the one hand, high-quality waste heat is not effectively utilized, and on the other hand, the factory's summer air conditioning and refrigeration also require consumption of other forms of energy. How to combine the two, reduce energy consumption, achieve waste heat refrigeration, and bring greater economic benefits to the enterprise? This utility model patent provides a solution. Utility Model Content

[0006] In view of the above situation, the utility model patent provides a carbon calcined coke steam heat exchange air conditioning and refrigeration system, which can achieve high-quality recovery of waste heat and provide summer air conditioning and refrigeration for buildings and factory buildings in need throughout the factory.

[0007] Specifically, this utility model patent is realized through the following technical solutions:

[0008] A carbon calcined coke steam heat exchange air conditioning refrigeration system, the air conditioning refrigeration system comprises a steam-producing water jacket heat exchange subsystem, a steam collecting subsystem, an air conditioning refrigeration subsystem and a water supply deoxygenation subsystem; the steam-producing water jacket heat exchange subsystem is connected to the steam collecting subsystem through an outlet steam pipeline; the output end of the steam collecting subsystem is connected to the air conditioning refrigeration subsystem through a lithium bromide unit steam pipeline; and the output end of the steam collecting subsystem is connected to the water supply deoxygenation subsystem through a deoxygenation steam pipeline; wherein: the air conditioning refrigeration subsystem is composed of a lithium bromide refrigeration unit, a condensate pump, a cold water circulation pump and a user air conditioning unit; the output end of the lithium bromide refrigeration unit is connected to the user air conditioning unit through a cold water supply pipeline; the output end of the user air conditioning unit is connected to the lithium bromide refrigeration unit through a cold water circulation pump and a cold water return pipeline; wherein:

[0009] The lithium bromide refrigeration unit will provide the generated 7°C cold water to the user air-conditioning unit through the cold water supply pipeline. The user air-conditioning unit inputs the cold energy into the room through the 7°C cold water, which is then converted into 12°C cold water. The user air-conditioning unit will allow the 12°C cold water to enter the lithium bromide unit again after passing through the cold water circulation pump and the cold water return pipeline.

[0010] Furthermore, the user air conditioning unit is composed of a water distribution tank, a water collection tank and an air conditioner; the lithium bromide refrigeration unit is connected to the water distribution tank through a cold water supply pipeline; the water distribution tank is connected to the water collection tank through the air conditioner.

[0011] Furthermore, the steam collection subsystem includes a steam drum and its accessories, and a steam header; the steam-producing water jacket heat exchange subsystem is composed of a downcomer, a circulating pump, a steam heat exchanger and a riser; the output end of the steam heat exchanger transports the generated steam or steam-water mixture to the steam drum through the riser for further steam-water separation; the output end of the steam drum is connected to the steam heat exchanger through the downcomer; its output end is connected to the steam header through the outlet steam pipeline; and a circulating pump is provided on the downcomer.

[0012] Furthermore, the feed water deoxygenation subsystem is composed of a deoxygenation steam pipeline, a deaerator, a feed water pipeline and a feed water pump; one path of the deaerator input end is connected to the steam header through the deoxygenation steam pipeline; the other path of the deaerator input end is connected to the condensate pump through the condensate pipeline; the deaerator output end is connected to the steam drum through the feed water pipeline and the feed water pump in turn.

[0013] Furthermore, the deaerator is connected to a water supply system via an external water supply pipeline.

[0014] Furthermore, the steam header adopts a pressure of 0.5MPa to 1.1MPa.

[0015] Furthermore, the steam heat exchanger adopts a double spiral tube heat exchanger.

[0016] Beneficial Effects

[0017] 1. The utility model sets a steam heat exchanger for cooling the coke after calcination, so that the waste heat can be efficiently recovered.

[0018] 2. The utility model is provided with a steam drum, which has a large adjustability. No matter what state the working medium in the steam heat exchanger is in (hot water, steam-water two-phase flow, steam), it can be transported to the steam drum. The steam and water expand and flash evaporate in the steam drum, and the steam and water are separated. The steam is collected in the upper space of the steam drum, and the hot water is collected in the lower part of the steam drum.

[0019] 3. This utility model sets a forced circulation pump, which can provide a strong power source for the steam heat exchanger. No matter what state the working fluid in the steam heat exchanger is in, it can keep the working fluid of the steam heat exchanger in a flowing state and take away the heat of the calcined coke in time. It can avoid the local high temperature of the steam superheater and damage. The pressurization of the forced circulation pump makes the working fluid pressure of the steam heat exchanger slightly greater than the drum pressure. After the working fluid of the steam heat exchanger enters the drum, it can be expanded and flash evaporated to produce more steam.

[0020] 4. The utility model increases the deoxygenation function through the water supply deoxygenation subsystem, reduces the possibility of high-temperature oxidation, and prolongs the life of the system, equipment, and pipelines.

[0021] 5. The utility model is combined with a lithium bromide refrigeration unit. The lithium bromide refrigeration unit realizes refrigeration by utilizing the absorption and release of water vapor by lithium bromide aqueous solution at different temperatures. This cycle requires the use of external heat sources to realize refrigeration. Common heat sources are steam, hot water, gas, fuel oil, etc. The direct heat source of the lithium bromide refrigeration unit of the utility model is steam, and the indirect heat source is the waste heat of calcined coke, which can realize the utilization of waste heat to save energy and reduce carbon emissions, and can also generate greater economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a system diagram of a carbon calcined coke steam heat exchange air conditioning and refrigeration system of the utility model patent.

[0023] Reference numerals:

[0024] 100. Steam collecting subsystem; 101. Steam drum and accessories; 102. Steam drum outlet steam pipeline; 103. Steam header;

[0025] 200, steam-producing water jacket heat exchange subsystem; 201, downcomer; 202, circulating pump; 203, steam heat exchanger; 204, riser;

[0026] 300, feedwater deoxygenation subsystem; 301, deoxygenated steam pipeline; 302, deaerator; 303, feedwater pump; 304, drum feedwater pipeline; 305, external feedwater pipeline;

[0027] 400 air conditioning refrigeration subsystem; 401, lithium bromide unit steam pipeline; 402, lithium bromide refrigeration unit; 403, condensate pipeline; 404, condensate pump; 501, cold water supply pipeline; 502, user air conditioning unit; 503, cold water circulation pump; 504, cold water return pipeline DETAILED DESCRIPTION

[0028] The utility model patent is further described below in conjunction with the accompanying drawings.

[0029] A carbon calcined coke steam heat exchange air conditioning and refrigeration system comprises a steam-water jacket heat exchange subsystem 200, a steam collection subsystem 100, a water feed deoxygenation subsystem 300 and an air conditioning and refrigeration subsystem 400.

[0030] The steam-water jacket heat exchange subsystem 200 includes a downcomer 201, a circulating pump 202, a steam heat exchanger 203, and an ascending pipe 204. The core of the heat exchange subsystem 100 is the circulating pump 202, which is a reliable power guarantee for the system. Due to the forced pressurization of the circulating pump, the steam and water in the steam heat exchanger 203 flow smoothly, which ensures the waste heat recovery effect and is conducive to ensuring the safe operation of the system and equipment. The steam or steam-water mixture generated by the steam heat exchanger 203 is transported to the steam drum for further steam-water separation. The circulating pump adopts a high-temperature resistant water pump, and the steam heat exchanger 203 adopts a double spiral tube heat exchanger.

[0031] After the steam or steam-water mixture is produced by the steam-producing water jacket heat exchange subsystem 200, the steam is collected by the steam collecting subsystem 100. The steam collecting subsystem 100 includes a steam drum and its accessories 101, a steam drum outlet steam pipeline 102, and a steam header 103. The steam drum 101 is a horizontal tank structure, and its accessories are some auxiliary facilities to ensure the safe operation of the steam drum 101, which are conventional settings. The steam or steam-water mixture generated by the calcined coke steam heat exchanger 203 enters the steam drum 101, and the steam and water are separated in the steam drum 101. The steam gathers in the upper space inside the steam drum 101, and the hot water gathers in the lower space of the steam drum 101. The hot water is the water source for the steam-producing subsystem. The working pressure of the steam header 103 can be 0.5MPa to 1.1MPa according to the system design.

[0032] The air conditioning refrigeration subsystem 400 is composed of a lithium bromide unit steam pipeline 401, a lithium bromide refrigeration unit 402, a condensate pipeline 403, a condensate pump 404, a cold water supply pipeline 501, a user air conditioning unit 502, a cold water circulation pump 503, and a cold water return pipeline 504. After the steam is collected in the steam header 103, the lithium bromide refrigeration unit steam pipeline 401 provides the steam to the lithium bromide refrigeration unit 402. At present, the lithium bromide unit 402 can utilize steam of 0.4MPa, 0.6MPa, 0.8MPa, and 1.0MPa in different grades. The lithium bromide refrigeration unit 402 realizes refrigeration by utilizing the absorption and release of water vapor by lithium bromide aqueous solution at different temperatures. This cycle requires the use of external heat sources such as steam, hot water, gas, fuel oil, etc. to realize the refrigeration function. The lithium bromide refrigeration unit 402 utilizes the steam produced by the waste heat of calcined coke in the utility model, and finally provides air conditioning and refrigeration for the factory, that is, realizes energy saving and carbon reduction by waste heat utilization, and can generate economic benefits.

[0033] In the air conditioning refrigeration subsystem 400, the steam of the lithium bromide refrigeration unit 402 evaporates the lithium bromide solution in the lithium bromide unit to become condensed water, and the condensed water re-enters the deaerator 302 through the condensed water pipeline 403 and the condensed water pump 404.

[0034] The air-conditioning and refrigeration subsystem 400 and the 7°C cold water generated by the lithium bromide refrigeration unit 402 are provided to the user air-conditioning unit 502 through the cold water supply pipeline 501. After passing through the user air-conditioning unit 502, the 7°C cold water inputs the cold energy into the room and then becomes 12°C cold water, thereby realizing the air-conditioning and refrigeration function of buildings and factories. The 12°C cold water enters the lithium bromide refrigeration unit 402 again after passing through the cold water circulation pump 503 and the cold water return pipeline 504.

[0035] To ensure the safe operation of the system, the utility model further provides a water supply deoxygenation subsystem 300, which is composed of a deoxygenation steam pipeline 301, a deaerator 302, an external water supply pipeline 305, a drum water supply pipeline 304 and a water supply pump 303. The deoxygenation heat source of the deoxygenation subsystem 300 is the steam of the steam header 103. The steam, the condensed water of the lithium bromide refrigeration unit 402 and the external water supply of the system 305 are deoxygenated in the deaerator 302, and the qualified water is transported to the drum through the water supply pipeline 304 and the water supply pump 303 of the drum 101. Through the above specific implementation scheme, the waste heat of the calcined coke in the calcining furnace can be used to produce steam with higher quality. The system is provided with a lithium bromide refrigeration unit, and the steam produced by the waste heat of the calcined coke is used to achieve the effect of air conditioning refrigeration.

[0036] The above is only the preferred implementation of the utility model patent, but the utility model patent is not limited to the above specific implementation. For ordinary technicians in this field, several modifications and improvements can be made without departing from the creative concept, which all fall within the scope of protection of the utility model patent.

Claims

1. A carbon calcined coke steam heat exchange air conditioning refrigeration system, characterized in that: The air-conditioning and refrigeration system includes a steam-producing water jacket heat exchange subsystem, a steam collecting subsystem, an air-conditioning and refrigeration subsystem and a water supply deoxygenation subsystem; the steam-producing water jacket heat exchange subsystem is connected to the steam collecting subsystem through an outlet steam pipeline; the output end of the steam collecting subsystem is connected to the air-conditioning and refrigeration subsystem through a lithium bromide unit steam pipeline; and the output end of the steam collecting subsystem is connected to the water supply deoxygenation subsystem through a deoxygenation steam pipeline; wherein: the air-conditioning and refrigeration subsystem is composed of a lithium bromide refrigeration unit, a condensate water pump, a cold water circulation pump and a user air-conditioning unit; the output end of the lithium bromide refrigeration unit is connected to the user air-conditioning unit through a cold water supply pipeline; the output end of the user air-conditioning unit is connected to the lithium bromide refrigeration unit through a cold water circulation pump and a cold water return pipeline.

2. The carbon calcined coke steam heat exchange air conditioning refrigeration system according to claim 1, characterized in that: The user air conditioning unit is composed of a water distribution tank, a water collection tank and an air conditioner; the lithium bromide refrigeration unit is connected to the water distribution tank through a cold water supply pipeline; the water distribution tank is connected to the water collection tank through the air conditioner.

3. The carbon calcined coke steam heat exchange air conditioning refrigeration system according to claim 1, characterized in that: The steam collecting subsystem includes a steam drum and its accessories, and a steam header; the steam-producing water jacket heat exchange subsystem is composed of a downcomer, a circulating pump, a steam heat exchanger and an ascending pipe; the output end of the steam heat exchanger transports the generated steam or steam-water mixture to the steam drum through the ascending pipe for further steam-water separation; the output end of the steam drum is connected to the steam heat exchanger through the downcomer; its output end is connected to the steam header through the outlet steam pipeline; a circulating pump is provided on the downcomer.

4. A carbon calcined coke steam heat exchange air conditioning refrigeration system according to claim 3, characterized in that: The feed water deoxygenation subsystem is composed of a deoxygenation steam pipeline, a deaerator, a feed water pipeline and a feed water pump; one path of the deaerator input end is connected to the steam header through the deoxygenation steam pipeline; the other path of the deaerator input end is connected to the condensate water pump through the condensate pipeline; the deaerator output end is connected to the steam drum through the feed water pipeline and the feed water pump in turn.

5. A carbon calcined coke steam heat exchange air conditioning refrigeration system according to claim 4, characterized in that: The deaerator is connected to the water supply system through an external water supply pipeline.

6. A carbon calcined coke steam heat exchange air conditioning refrigeration system according to claim 5, characterized in that: The steam header adopts a pressure of 0.5MPa to 1.1MPa.

7. The carbon calcined coke steam heat exchange air conditioning refrigeration system according to claim 3, characterized in that: The steam heat exchanger adopts a double spiral tube heat exchanger.

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