阅读说明：本技术 一种电石炉冷却余热发电系统 (calcium carbide furnace cooling waste heat power generation system ) 是由 符鑫杰 彭岩 仝伟峰 李涛 班允鹏 孟达 于 2019-08-16 设计创作，主要内容包括：一种电石炉冷却余热发电系统,汽化冷却烟道上连接有余热循环管路,发电机上连接有膨胀机,膨胀机上连接有有机循环管路；余热循环管路上依次连接有汽包、蓄热器、蒸发器、预热器和除氧器,使余热气体在蓄热器内转化为高温水后再流入蒸发器,蒸发器和预热器也连接在有机循环管路上,通过有机工质和高温水在蒸发器中进行换热,使有机工质蒸汽流入膨胀机中进行膨胀做功,通过有机工质冷凝器使有机工质蒸汽转化为有机工质液体；除氧器的出口连接有第二水泵,第二水泵同时与汽包和蓄热器连接；汽包的底部还通过第三水泵与汽化冷却烟道连接,使汽包中的欠饱和水能够被第三水泵带动而直接流回汽化冷却烟道,以实现汽化冷却烟道中余热气体的循环利用。(A calcium carbide furnace cooling waste heat power generation system is characterized in that a waste heat circulation pipeline is connected to a vaporization cooling flue, an expander is connected to a generator, and an organic circulation pipeline is connected to the expander; the waste heat circulating pipeline is sequentially connected with a steam pocket, a heat accumulator, an evaporator, a preheater and a deaerator, so that waste heat gas is converted into high-temperature water in the heat accumulator and then flows into the evaporator, the evaporator and the preheater are also connected to the organic circulating pipeline, heat exchange is carried out in the evaporator through organic working media and the high-temperature water, so that organic working medium steam flows into an expander to do work through expansion, and the organic working medium steam is converted into organic working medium liquid through an organic working medium condenser; the outlet of the deaerator is connected with a second water pump, and the second water pump is simultaneously connected with the steam drum and the heat accumulator; the bottom of the steam pocket is also connected with the vaporization cooling flue through a third water pump, so that the undersaturated water in the steam pocket can be driven by the third water pump to directly flow back to the vaporization cooling flue, and the cyclic utilization of residual heat gas in the vaporization cooling flue is realized.)

1. The utility model provides a carbide stove cooling waste heat power generation system, utilizes in vaporization cooling flue (1) to the high temperature waste heat gas drive generator (10) that carbide stove heat transfer cooling back gained to generate electricity, its characterized in that: the evaporation cooling flue (1) is connected with a waste heat circulating pipeline for waste heat gas to flow circularly, the generator (10) is connected with an expander (11), and the expander (11) is connected with an organic circulating pipeline for organic working medium to flow circularly;

The waste heat circulating pipeline is sequentially connected with a steam pocket (2), a heat accumulator (3), an evaporator (5), a preheater (6) and a deaerator (7) along the flowing direction of waste heat gas, so that the waste heat gas flows into the heat accumulator (3) from the steam pocket (2) and is converted into high-temperature water, and then flows into the evaporator (5), the evaporator (5) and the preheater (6) are also connected onto the organic circulating pipeline, the organic circulating pipeline is also connected with an organic working medium condenser (12) and an organic working medium pump (13), heat exchange is carried out in the evaporator (5) through organic working medium and high-temperature water, the organic working medium steam flows into an expander (11) to do work through expansion, the organic working medium steam flowing out of the expander (11) is cooled through the organic working medium condenser (12), the organic working medium steam after doing work is converted into organic working medium liquid, and heat exchange is carried out in the preheater (6) through the organic working medium liquid and the high-temperature water, the preheated organic working medium flows back to the evaporator (5) to realize the cyclic evaporation work of the organic working medium;

The outlet of the heat accumulator (3) is connected with a first water pump (4), the first water pump (4) is simultaneously connected with the evaporator (5) and the steam drum (2), so that high-temperature water can flow from the heat accumulator (3) to the evaporator (5), and redundant high-temperature water can directly flow back to the steam drum (2); the outlet of the deaerator (7) is connected with a second water pump (8), the second water pump (8) is simultaneously connected with the steam drum (2) and the heat accumulator (3), so that high-temperature water which flows out of the preheater (6) and is deaerated by the deaerator (7) can respectively flow back to the steam drum (2) and the heat accumulator (3); the bottom of the steam pocket (2) is also connected with the evaporative cooling flue (1) through a third water pump (9), so that undersaturated water in the steam pocket (2) can be driven by the third water pump (9) to directly flow back to the evaporative cooling flue (1), and cyclic utilization of waste heat gas in the evaporative cooling flue (1) is realized.

2. The calcium carbide furnace cooling waste heat power generation system of claim 1, wherein: the organic working medium condenser (12) is connected with a cooling pipeline, the cooling pipeline is connected with a cooling tower (14) used for providing cooling media for the cooling pipeline, and the cooling pipeline is further connected with a fourth water pump (15).

3. The calcium carbide furnace cooling waste heat power generation system of claim 1, wherein: the organic working medium is pentafluoropropane.

4. the calcium carbide furnace cooling waste heat power generation system of claim 1, wherein: the deaerator (7) is connected with a water jet air ejector (16), the water jet air ejector (16) is connected with the water tank (17) through a water return pipe, and a fifth water pump (18) is connected to the water return pipe, so that water flow in the water tank (17) enters the water jet air ejector (16) and is returned to the water tank (17) after being flushed out along with gas in the deaerator (7) by the water jet air ejector (16).

5. The calcium carbide furnace cooling waste heat power generation system of claim 1, wherein: the top of the deaerator (7) is connected with a water ring vacuum pump (19).

6. The calcium carbide furnace cooling waste heat power generation system of claim 1, wherein: the first water pump (4) is connected with an inlet of the deaerator (7) through the plate type heat exchanger (20).

7. The calcium carbide furnace cooling waste heat power generation system of claim 1, wherein: the second water pump (8) is connected with the vaporization cooling flue (1) to realize emergency and safe water supplement from the deaerator (7) to the vaporization cooling flue (1).

Technical Field

The invention relates to the field of waste heat power generation systems, in particular to a calcium carbide furnace cooling waste heat power generation system.

Background

Calcium carbide is an important basic chemical raw material in China, about 70 percent of the current calcium carbide output is used in chemical industries such as PVC production, organic synthesis and the like, 8 percent of the current calcium carbide output is used in industries such as mechanical metallurgy and the like, and 2 percent of the current calcium carbide output is used in export. By 2018, the capacity of the device is 4500 million tons, and the yield is about 2500 million tons. GB21343-2015 limit for energy consumption of carbide unit product issued in 2015 regulates the electric furnace power consumption and comprehensive energy consumption to 3080 kilowatt-hour/ton and 0.823 ton of standard coal. How to improve the resource utilization rate, protect the environment and safely produce will become an important task and focus of attention of the industry.

At present, most of newly-built calcium carbide electric furnaces are fully closed furnaces, the flue gas temperature reaches about 900 ℃, and a large amount of circulating cooling water is needed for cooling the newly-built calcium carbide electric furnaces in order to protect the safety of equipment and the safe operation of a system. At present, a softened water open type cooling system is adopted, a large amount of chemical agents are needed to reduce the hardness of circulating water, and a large amount of circulating water is needed to ensure that the outlet temperature does not exceed 60 ℃ so as to prevent the surface scaling caused by overhigh temperature from influencing the operation safety of equipment. Because the open circulation cooling system with large water volume is adopted, the heat of the calcium carbide furnace is converted into the heat energy in the waste heat gas, but the prior art lacks reasonable means to utilize the heat energy in the waste heat gas, so that a large amount of waste heat resources are wasted, and a large amount of water resources and electric power resources are consumed.

disclosure of Invention

The invention provides a calcium carbide furnace cooling waste heat power generation system, aiming at solving the problem that a large amount of waste heat in waste heat gas is not effectively utilized due to an open type circulating water cooling system adopted in the existing calcium carbide furnace.

The technical scheme adopted by the invention for solving the technical problems is as follows: a calcium carbide furnace cooling waste heat power generation system utilizes high-temperature waste heat gas obtained after heat exchange and cooling of a calcium carbide furnace in a vaporization cooling flue to drive a generator to generate power, wherein the vaporization cooling flue is connected with a waste heat circulation pipeline for waste heat gas to flow circularly, the generator is connected with an expander, and the expander is connected with an organic circulation pipeline for organic working medium to flow circularly;

The waste heat circulating pipeline is sequentially connected with a steam pocket, a heat accumulator, an evaporator, a preheater and a deaerator along the flowing direction of waste heat gas, so that the waste heat gas flows into the heat accumulator from the steam pocket, is converted into high-temperature water and then flows into the evaporator, the evaporator and the preheater are also connected to an organic circulating pipeline, the organic circulating pipeline is also connected with an organic working medium condenser and an organic working medium pump, the organic working medium and the high-temperature water exchange heat in the evaporator, so that the organic working medium steam flows into the expansion machine to do expansion work, the organic working medium steam flowing out from the expander is cooled by the organic working medium condenser, so that the organic working medium steam after expansion and working is converted into organic working medium liquid, the preheated organic working medium flows back to the evaporator through heat exchange between the organic working medium liquid and high-temperature water in the preheater so as to realize the cyclic evaporation work of the organic working medium;

the outlet of the heat accumulator is connected with a first water pump, the first water pump is simultaneously connected with the evaporator and the steam drum, so that high-temperature water can flow from the heat accumulator to the evaporator, and redundant high-temperature water can directly flow back to the steam drum; the outlet of the deaerator is connected with a second water pump, and the second water pump is simultaneously connected with the steam drum and the heat accumulator, so that high-temperature water which flows out of the preheater and is deaerated by the deaerator can respectively flow back to the steam drum and the heat accumulator; the bottom of the steam pocket is also connected with the vaporization cooling flue through a third water pump, so that the undersaturated water in the steam pocket can be driven by the third water pump to directly flow back to the vaporization cooling flue, and the cyclic utilization of residual heat gas in the vaporization cooling flue is realized.

Preferably, the organic working medium condenser is connected with a cooling pipeline, the cooling pipeline is connected with a cooling tower for providing cooling medium for the cooling pipeline, and the cooling pipeline is further connected with a fourth water pump.

Preferably, the organic working medium is pentafluoropropane.

Preferably, the deaerator is connected with a water jet air ejector, the water jet air ejector is connected with the water tank through a water return pipe, and the water return pipe is connected with a fifth water pump, so that water flow in the water tank enters the water jet air ejector and is returned to the water tank after being flushed out along with gas in the deaerator by the water jet air ejector.

Preferably, the top of the deaerator is connected with a water ring vacuum pump.

Preferably, the first water pump is connected with an inlet of the deaerator through the plate heat exchanger.

Preferably, the second water pump is connected with the vaporization cooling flue so as to realize emergency and safe water supplement from the deaerator to the vaporization cooling flue.

According to the technical scheme, the invention has the beneficial effects that:

The invention enables high-temperature waste heat gas obtained after heat exchange and cooling of the calcium carbide furnace in the vaporization cooling flue to be converted into high-temperature water through the steam pocket and the heat accumulator, then the high-temperature water flows into the evaporator and the preheater and exchanges heat with the organic working medium in the evaporator and the preheater, so that the organic working medium is heated and converted into steam and enters the expander to do work, the generator can be driven to generate electricity, the high-temperature water after heat exchange flows back to the steam pocket and the heat accumulator, and the undersaturated water in the steam pocket can be driven by the third water pump to directly flow back to the vaporization cooling flue, thereby realizing the recycling of the waste heat gas in the vaporization cooling flue, efficiently utilizing the heat of the waste heat gas in the vaporization cooling flue, and cooling the calcium carbide furnace again through the water obtained after heat exchange of the waste heat gas due to the rapid reduction of the temperature of the waste heat gas, thereby reducing the water amount needed to be used in, and simultaneously, water resources and electric power resources are saved.

drawings

FIG. 1 is a schematic view of the present invention;

FIG. 2 is a diagram illustrating a second embodiment.

The labels in the figure are: 1. the system comprises a vaporization cooling flue, 2, a steam pocket, 3, a heat accumulator, 4, a first water pump, 5, an evaporator, 6, a preheater, 7, a deaerator, 8, a second water pump, 9, a third water pump, 10, a generator, 11, an expander, 12, an organic working medium condenser, 13, an organic working medium pump, 14, a cooling tower, 15, a fourth water pump, 16, a water jet air extractor, 17, a water tank, 18, a fifth water pump, 19, a water ring vacuum pump, 20 and a plate heat exchanger.

Detailed Description

referring to the drawings, the specific embodiments are as follows: