21
2023
-
12
Hazardous waste incineration rotary kiln design to focus on the issue of consideration
Since the hazardous waste contains some flammable substances, in order to prevent the hazardous waste crushing process may produce fire, explosion and other working conditions, the crusher system is equipped with N2 oxygen control system, crusher plug valve before and after the configuration of the oxygen content detection function. Once the oxygen content is higher than 6%, the system automatically closes the upper and lower hydraulic gates and starts the button system to complete the functions of N2 injection, oxygen detection and material discharge. At the same time to ensure the reliable operation of the plug valve, the crusher system import and export set up hydraulic plug gate, double protection.
1、Pre-processing system
Since the hazardous waste contains some flammable substances, in order to prevent the hazardous waste crushing process may produce fire, explosion and other working conditions, the crusher system is equipped with N2 oxygen control system, before and after the crusher plug valve is equipped with oxygen content detection function. Once the oxygen content is higher than 6%, the system automatically closes the upper and lower hydraulic gates and starts the button system to complete the functions of N2 injection, oxygen detection and material discharge. At the same time to ensure the reliable operation of the plug valve, the crusher system import and export set up hydraulic plug gate, double protection.
2、Feed sealing and processing
The kiln head feeding system of rotary kiln can easily cause backfire of rotary kiln head, so it is necessary to design double hydraulic flap door to ensure safety during operation. When feeding, the two hydraulic doors can not be opened at the same time, the upper feed hopper material level reaches the set value, the upper hydraulic door automatically open, after the completion of the fall of material, the upper hydraulic door closes, the lower hydraulic door opens, solid waste through the chute into the rotary kiln. The intermediate hopper between the feeding chute and the two hydraulic doors is cooled by soft water. The whole feeding process runs under sealing and cooling to ensure safe operation.
3、Rotary kiln coking problems and treatment
In the past project operation, the rotary kiln tail coking problem often occurs. This is due to the rotary kiln burner installed in the kiln head, the combustion temperature is very high, when the feed contains low melting point salts in the waste, the ash is easy to become molten state, these ashes near the end of the kiln, the combustion temperature is low, molten ash is easy to bonded in the refractory material. The rotary kiln tail can be inserted into the second combustion chamber, and the second combustion chamber share a slag outlet, the bottom of the second combustion chamber is set up with a large opening for slag, so as to facilitate the large particles of slag fall. At the same time, a multi-component burner is set at the bottom of the second combustion chamber to ensure that the combustion temperature of the second combustion chamber is higher than 1100 ℃, and at the same time to improve the temperature of the rotary kiln tail, from the operating parameters, the temperature of the tail of the kiln can reach more than 1,000 ℃, to ensure that the slag falls directly to the bottom of the water sealing slag machine. Waste material into the furnace before incineration, the furnace waste for the right mix, containing low melting point salts of waste materials, must be blended before entering the furnace. Operation, the need for operators of the rotary kiln two combustion chamber of the burning temperature, the primary air and the second wind of a reasonable ratio to ensure that the rotary kiln and the two combustion chamber of the stable combustion. At the same time, the operator should frequently inspect, once observed from the end of the kiln end observation mirror coking phenomenon, to replace the high calorific value, does not contain low melting point salts of the waste to be burned, increase the temperature of the kiln end, as far as possible, slowly melt the coking. The two sides of the second combustion chamber need to be set up to open the observation hole.
4、Boiler ash corrosion problems and treatment
Waste heat boiler ash and corrosion of the heating surface is a common problem in hazardous waste incineration, common waste heat boiler arrangement of horizontal waste heat boiler and vertical waste heat boiler, horizontal waste heat boiler in hazardous waste combustion application is less, mainly because of the horizontal arrangement of the waste heat boiler is prone to accumulation of ash and corrosion. When designing, the flue gas temperature into the superheater does not exceed 650 ℃, to ensure that the superheater tube wall temperature is lower than 450 ℃, to avoid high temperature chlorine corrosion of the superheater. At the same time, in long-term operation, the temperature of the second combustion chamber should be controlled below 1200 ℃, to avoid over-temperature operation resulting in superheater corrosion, as well as high-temperature combustion resulting in excessive nitrogen oxides.
5, two-stage wet deacidification system corrosion problems
Scrubber tower and adsorption tower in order to increase the contact area of the flue gas and reaction lye, extend the reaction time of the flue gas and lye, the internal are set up with a multi-face hollow Bauer ring packing, which is made of polypropylene, with good corrosion resistance to acid and alkali. Scrubber tower and adsorption tower body is made of corrosion-resistant glass fiber reinforced plastic (FRP). In order to ensure the strength of the washing tower and adsorption tower, carbon steel lined with glass fiber reinforced plastic form can be selected. The upper emergency cooling section of the washing tower adopts regular ceramic packing, and the emergency cooling section is made of special high-temperature-resistant glass fiber reinforced plastic. All circulating pipelines are made of carbon steel lined with FRP to ensure the stable operation of the system.
The above points for the design of hazardous waste incineration need to focus on the consideration of a few points, with the incineration process and the continuous updating of the process, a variety of incinerator improvements, soot, tail gas purification technology to push the new, incineration energy recovery rate continues to improve, incineration disposal methods are more and more perfect and modernized. I believe that in the near future, incineration disposal methods in the treatment of hazardous waste disposal methods will continue to increase the proportion.
-
Address: Dongyu City, Boshan Economic Development Zone, Zibo City, Shandong Province
Service Hotline:+86-0533-4180700 -
Service Hotline:+86-0533-4165666
-
Service Hotline:+8613505334577
-
Service Hotline:+8613455336677
Email:czcldj@163.com -
Email:lichangzheng07@163.com
Scan attention WeChat public number
©2022 Shandong Changzheng Mechanical Equipment Manufacturing Co., Ltd |