A rotary kiln pyrolysis gas comprehensive utilization system

Abstract

This invention provides a rotary kiln pyrolysis gas comprehensive utilization system, including an externally heated rotary kiln, a high-temperature dust collector, a heat exchanger, a condenser, a dewatering buffer tank, a pyrolysis gas blower, a flue gas blower, and a water storage tank. The externally heated rotary kiln is equipped with a jacket, a flue gas outlet, a material inlet, a natural gas inlet, a pyrolysis gas inlet, and a pyrolysis gas outlet. The flue gas outlet is connected to the jacket. The material inlet extends into the inner cylinder of the externally heated rotary kiln. The natural gas inlet and the pyrolysis gas inlet extend into the jacket. One end of the pyrolysis gas outlet is connected to the inner cylinder of the externally heated rotary kiln, and the other end is connected to the inlet of the high-temperature dust collector. The flue gas outlet of the high-temperature dust collector is sequentially connected to the heat exchanger, the condenser, the dewatering buffer tank, and the pyrolysis gas inlet. This rotary kiln pyrolysis gas comprehensive utilization system can use the pyrolysis gas after dust and water removal as fuel, directly fed into the rotary kiln for combustion, thus significantly saving natural gas consumption.

Description

Technical Field

[0001] This utility model belongs to the field of energy-saving and environmental protection technology, and in particular relates to a comprehensive utilization system for rotary kiln pyrolysis gas. Background Technology

[0002] Rotary kiln pyrolysis furnaces offer numerous advantages, making them promising for applications in the treatment of solid waste such as activated carbon and waste tires. They can rapidly and efficiently process large quantities of solid waste, significantly reducing its volume and achieving waste reduction. Through high-temperature pyrolysis, heavy components in the waste are converted into light oils and gases, resulting in shorter processing times and higher efficiency. Currently, the hot gas from rotary kilns is typically directly introduced into the secondary combustion chamber for combustion with natural gas. However, the pyrolysis gas contains a large amount of particulate matter and moisture, requiring the addition of significant amounts of natural gas during combustion, leading to higher costs. Utility Model Content

[0003] To address the problem of insufficient utilization of pyrolysis gas and high combustion energy consumption, this utility model discloses a rotary kiln pyrolysis gas comprehensive utilization system. The system can remove dust and water from the pyrolysis gas and use it as fuel, directly feeding it into the rotary kiln for combustion, which can significantly save on natural gas consumption.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A rotary kiln pyrolysis gas comprehensive utilization system includes an externally heated rotary kiln, a high-temperature dust collector, a heat exchanger, a condenser, a dewatering buffer tank, a pyrolysis gas blower, a flue gas blower, and a water storage tank. The externally heated rotary kiln is equipped with a jacket, a flue gas outlet, a material inlet, a natural gas inlet, a pyrolysis gas inlet, and a pyrolysis gas outlet. The flue gas outlet is connected to the jacket. The material inlet extends into the inner cylinder of the externally heated rotary kiln. The natural gas inlet and the pyrolysis gas inlet extend into the jacket. One end of the pyrolysis gas outlet is connected to the inner cylinder of the externally heated rotary kiln, and the other end is connected to the inlet of the high-temperature dust collector. The flue gas outlet of the high-temperature dust collector is sequentially connected to the heat exchanger, the condenser, the dewatering buffer tank, and the pyrolysis gas inlet.

[0006] Furthermore, the heat exchanger is a shell-and-tube heat exchanger, including a hot pyrolysis gas inlet, a cold air inlet, a hot pyrolysis gas outlet, and a hot air outlet. The hot pyrolysis gas inlet is connected to a high-temperature dust collector, and the hot air outlet is connected to both a natural gas inlet and a pyrolysis gas inlet.

[0007] Furthermore, the condenser is a shell-and-tube condenser with a hot and cold gas decomposition inlet, a cooling water inlet, a cooling water outlet, and a dry hot gas decomposition outlet. The hot and cold gas decomposition inlet is connected to the hot and cold gas decomposition outlet of the heat exchanger, the cooling water outlet is connected to a water storage tank, and the dry hot gas decomposition outlet is connected to a dewatering buffer tank.

[0008] Furthermore, the bottom of the dewatering buffer tank is connected to the water storage tank, the upper air outlet is connected to the inlet of the pyrolysis gas blower, and the outlet of the pyrolysis gas blower is connected to the pyrolysis gas inlet of the externally heated rotary kiln.

[0009] Furthermore, the flue gas fan inlet is connected to the flue gas outlet of the externally heated rotary kiln.

[0010] The rotary kiln pyrolysis gas comprehensive utilization system of this utility model involves the high-temperature pyrolysis gas generated in the rotary kiln first entering a high-temperature dust collector to remove particulate matter at 500-600℃, and then passing it into a shell-and-tube heat exchanger to heat the air. After heat exchange, the temperature of the pyrolysis gas is reduced to below 100℃, and it enters a condenser. Cooling water is introduced into the condenser to further cool the pyrolysis gas to below 50℃, causing the water vapor in the pyrolysis gas to condense into liquid and enter a water storage tank. The dehydrated pyrolysis gas then enters a dehydration buffer tank to reduce the gas flow rate and further remove any water droplets before entering the rotary kiln. The cold air, heated by the pyrolysis gas in the shell-and-tube heat exchanger, is then introduced into the rotary kiln as combustion air for natural gas and pyrolysis gas, reducing the amount of cold air used and saving natural gas. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the rotary kiln pyrolysis gas comprehensive utilization system described in this utility model.

[0012] Among them, 1-externally heated rotary kiln, 2-high temperature dust collector, 3-heat exchanger, 4-condenser, 5-water removal buffer tank, 6-pyrolysis gas blower, 7-flue gas blower, 8-water storage tank, 101-jacket, 102-flue gas outlet, 103-material inlet, 104-natural gas inlet, 105-pyrolysis gas inlet, 106-pyrolysis gas outlet, 301-hot pyrolysis gas inlet, 302-cold air inlet, 303-hot pyrolysis gas outlet, 304-hot air outlet. Detailed Implementation

[0013] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0014] like Figure 1As shown, a rotary kiln pyrolysis gas comprehensive utilization system includes an externally heated rotary kiln 1, a high-temperature dust collector 2, a heat exchanger 3, a condenser 4, a water removal buffer tank 5, a pyrolysis gas blower 6, a flue gas blower 7, and a water storage tank 8. The externally heated rotary kiln 1 is equipped with a jacket 101, a flue gas outlet 102, a material inlet 103, a natural gas inlet 104, a pyrolysis gas inlet 105, and a pyrolysis gas outlet 106. The flue gas outlet 102 is connected to the jacket 101. The material inlet 103 extends into the inner cylinder of the externally heated rotary kiln 1. The natural gas inlet 104 and the pyrolysis gas inlet 105 are... 5 extends into the jacket 101. One end of the pyrolysis gas outlet 106 is connected to the inner cylinder of the externally heated rotary kiln 1, and the other end is connected to the inlet of the high-temperature dust collector 2. The flue gas outlet of the high-temperature dust collector 2 is sequentially connected to the heat exchanger 3, the condenser 4, the dewatering buffer tank 5, and the pyrolysis gas inlet 105. The bottom of the dewatering buffer tank 5 is connected to the water storage tank 8, and the upper outlet is connected to the inlet of the pyrolysis gas blower 6. The outlet of the pyrolysis gas blower 6 is connected to the pyrolysis gas inlet 105 of the externally heated rotary kiln 1. The inlet of the flue gas blower 7 is connected to the flue gas outlet 102 of the externally heated rotary kiln 1.

[0015] In some embodiments, the heat exchanger 3 is a shell-and-tube heat exchanger, including a hot gas inlet 301, a cold air inlet 302, a hot gas outlet 303, and a hot air outlet 304. The hot gas inlet 301 is connected to the high-temperature dust collector 2, and the hot air outlet 304 is connected to the natural gas inlet 104 and the hot gas inlet 105, respectively.

[0016] The condenser 4 is a shell-and-tube condenser with a hot and cold decomposition gas inlet 401, a cooling water inlet 402, a cooling water outlet 403, and a dry hot decomposition gas outlet 404. The hot and cold decomposition gas inlet 401 is connected to the hot and cold decomposition gas outlet 303 of the heat exchanger 3, the cooling water outlet 403 is connected to the water storage tank 8, and the dry hot decomposition gas outlet 404 is connected to the dewatering buffer tank 5.

[0017] Those skilled in the art should understand that the above description is merely a specific embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A rotary kiln pyrolysis gas comprehensive utilization system, characterized in that, The system includes an externally heated rotary kiln, a high-temperature dust collector, a heat exchanger, a condenser, a dewatering buffer tank, a pyrolysis gas blower, a flue gas blower, and a water storage tank. The externally heated rotary kiln is equipped with a jacket, a flue gas outlet, a material inlet, a natural gas inlet, a pyrolysis gas inlet, and a pyrolysis gas outlet. The flue gas outlet is connected to the jacket. The material inlet extends into the inner cylinder of the externally heated rotary kiln. The natural gas inlet and the pyrolysis gas inlet extend into the jacket. One end of the pyrolysis gas outlet is connected to the inner cylinder of the externally heated rotary kiln, and the other end is connected to the inlet of the high-temperature dust collector. The flue gas outlet of the high-temperature dust collector is sequentially connected to the heat exchanger, the condenser, the dewatering buffer tank, and the pyrolysis gas inlet.

2. The rotary kiln pyrolysis gas comprehensive utilization system according to claim 1, characterized in that, The heat exchanger is a shell-and-tube heat exchanger, including a hot gas inlet, a cold air inlet, a hot gas outlet, and a hot air outlet. The hot gas inlet is connected to a high-temperature dust collector, and the hot air outlet is connected to both a natural gas inlet and a pyrolysis gas inlet.

3. The rotary kiln pyrolysis gas comprehensive utilization system according to claim 1, characterized in that, The condenser is a shell-and-tube condenser with a hot and cold gas decomposition inlet, a cooling water inlet, a cooling water outlet, and a dry hot gas decomposition outlet. The hot and cold gas decomposition inlet is connected to the hot and cold gas decomposition outlet of the heat exchanger, the cooling water outlet is connected to a water storage tank, and the dry hot gas decomposition outlet is connected to a dewatering buffer tank.

4. The rotary kiln pyrolysis gas comprehensive utilization system of claim 1, wherein, The bottom of the dewatering buffer tank is connected to the water storage tank, the upper air outlet is connected to the inlet of the pyrolysis gas blower, and the outlet of the pyrolysis gas blower is connected to the pyrolysis gas inlet of the externally heated rotary kiln.

5. The rotary kiln pyrolysis gas comprehensive utilization system according to claim 1, characterized in that, The flue gas fan inlet is connected to the flue gas outlet of the externally heated rotary kiln.

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