Lint humidification MJPH—B type slide type lint humidifier
MJPH-1400B slide-type lint humidifier is suitable for modern cotton finishing technology configuration in my country, and is used to rehumidify cotton fibers with too low moisture content after ginning.
(1) Main equipment, process layout and working conditions
1. Main equipment, components and process layout
MJPH-1400B slide type lint humidifier mainly consists of slide type lint humidifier and humidification host [Composition of fuel (or gas) hot blast stove, electronic control part, atomization system], humidification fan, exhaust axial flow fan, etc.
The slide-type lint humidifier is installed between the lint collector and the baler. The atomization system, the electronic control part, and the fuel (or gas) hot air stove are assembled on the same chassis. The slide-type lint humidifier is installed on the same chassis. The two are connected with a humidification fan (the fan is placed under the slide-type lint humidifier) and an insulated pipe. The user is required to install the humidification host in a closed and clean room (humidification host room) specially designed for it.
2. Working conditions and working environment
The applicable power supply voltage of the MJPH-1400B slide-type lint humidifier is three-phase 380V±5V, the frequency is 50Hz±2.5Hz; it is suitable for work at -15~40℃ ambient temperature. The water source is tap water or supplied from a special water tank, and the water quality should comply with general industrial water standards. The air in the humidification host room is required to be smooth and clean. The water in the spray tower of the atomization system must be changed once every shift to keep the water clean and pollution-free to prevent contamination of cotton. It must be noted that when using it in winter, the water supply system should be prevented from freezing.
(2) Main process parameters of MJPH-1400B slide type lint humidifier Humidified lint [kg/(unit h)] 4000～4500 Humidification volume (%) 2～4
Motor (kW) 12
After humidification, the lint moisture content (%) meets the international standard requirements
(3) Product system description
Under the action of the humidification fan, the external air is first sucked into the hot blast furnace, and the diesel (or natural gas, liquefied Gas) is pressurized (atomized) and burned by the hot air furnace burner to heat the air, so that the hot air enters the water spray tower of the atomization system, and is transformed into the required high-temperature and high-humidity air flow through the spray of atomized water. The moist air flow passes through the insulation connecting pipe and the humidification fan, and then is blown into the slide-type lint humidifier (i.e. lint slide), passing through the sliding lint layer to humidify the lint. The humidified lint is then sent to the lint baler for packaging.
In order to obtain appropriate hot and humid air flow, in addition to changing the size of the burner’s fuel injector, the water pump and circulating fan of the water spray tower also adopt advanced frequency conversion speed regulation technology. In order to improve the operational reliability and automation of the electrical automatic control system, the control department adopts PLC programmable control technology.
The residual hot and humid air at the outlet of the slide-type lint humidifier can pass through the channel set above the slide to insulate the top of the slide to prevent condensation, and then be discharged into the atmosphere through the exhaust axial flow fan through the pipe, or It is transported through pipelines to the top of the cotton outlet of the cotton collecting machine for pre-humidification to improve energy utilization.
(4) Usage and operating procedures
The electrical control part of the system adopts PLC control and frequency conversion technology. Generally speaking, it can be divided into fan and water pump control, temperature control, humidity control, safety control, system logic control, etc. , has the characteristics of high reliability, high degree of automation, good safety performance, simple operation and simple maintenance.
1. Pre-operation plans
(1) Make sure the water tank valve is open, the water supply is normal, and the water level is normal.
(2) Make sure the valve on the water pump pipeline is open.
(3) Clean the burner, protect the mesh surface, and ensure good ventilation.
2. Start the machine
(1) Close the air switch and wait for the electrical indication to be normal.
(2) Watch the oil level indicator to ensure that the oil level in the fuel tank is normal (when using gas combustion gas, ensure that the gas line pressure is normal).
(3) Pay attention to whether the indications of each temperature and humidity controller are normal. If there is any abnormality, you should contact an electrician (or professional technician) to troubleshoot.
(4) Start the water pump to ensure that the water pump and pipeline are smooth. If the temperature in winter is below 0°C, the water pump cannot be started directly. The water pump drain port must be opened first to check to ensure that the water pump is not frozen before starting the water pump.
(5) After confirming that the water pump is normal, click the “Start” button to start the system. The fan green indicator light will light up and the fan will start. Afterwards, the green indicator light of the burner will light up, the burner will make a “sizzling” sound, and it will ignite and burn after about 10 seconds.
(6) The system is divided into two states: automatic and manual. In the manual state, the operating status of the equipment can be manually adjusted as needed, and the safety protection and interlocking of the system also work. In the automatic state, human intervention is basically not required. The frequency of the frequency converter can also be adjusted according to the moisture regain of the lint to make the humidified lint meet the requirements.
3. System adjustment
(1) 15 to 30 minutes after starting the ignition, the system will enter a stable working state. After humidification, if the humidification amount is not enough, you can first increase the control value of “hot and humid air temperature” or increase or decrease the “humidification gear” according to the actual situation. The general principle is that when the amount of humidification is not enough,It mainly adjusts the temperature of hot and humid air, and at the same time adjusts the frequency of the water pump inverter.
(2) Method for adjusting the hot and humid air temperature controller:
① In the measurement state, press the ○ key. After 2 seconds, it will enter the manipulated value setting state, and the instrument will display the symbol of the parameter.
② Press the MOD key to select other parameters of this group in sequence.
③ Press the button to call up the original setting value of the current parameter, and the flashing bit is the correction bit. Modify parameters to required values by moving and using keys.
④Generally, the AL value should be 3~10℃ larger than the SP value.
4. Shutdown
(1) The air switch (main power supply) cannot be turned off directly unless it is an emergency. The PLC should infer the furnace temperature and automatically turn off the fan before turning off the air switch. Normal shutdown is to press the stop button, wait for the fan to stop, and then turn off the main power.
(2) Press the “Stop” button to shut down. If the furnace is relatively hot, in order to extend the service life of the furnace, the fan will continue to run until the furnace temperature drops to the set value before it can be shut down. If the stove is not very hot, let the machine automatically turn off the fan and then turn off the main power.
(3) After the fan stops, you can turn off the air switch.
5. Important Notices
(1) Although the safe operation of the system is fully considered and the system has taken some technical measures to limit the occurrence of danger, it still relies on the correct operation and maintenance of the user.
(2) Safety-type connections are adopted in all circuits. For example, important functions may be connected using normally closed connections to avoid damage caused by disconnected wiring. The dual control method is adopted for temperature control, which enhances the reliability of the system.
For example, in the humidification state, the prevention of over-temperature mainly depends on the setting value set by the user, but it is also protected by other components.
For example, the temperature switch can ensure that the lint will not discolor or burn even if it is damaged. Therefore, if there is a problem with the temperature switch, it must be replaced with a new one. Do not simply connect it directly with wires. Otherwise, it may cause immeasurable losses to the user.
(5) Maintenance and maintenance
(1) Pay attention to clearing the fibrous dust on the burner protective cover to ensure the normal operation of the hot blast stove.
(2) When using a fuel burner, pay attention to see if the fuel filter is blocked to ensure that the burner is working properly.
(3) Clean the fiber dust in the bottom layer of the slide-type lint humidifier from time to time to facilitate safe production.
(4) For routine maintenance of other common components, such as water pumps, fans, etc., please refer to the regulations in their operating instructions.
(5) When changing the water in the water spray tower during each shift, open the door of the water spray tower and clean the debris on the lower water filter screen to prevent damage to the water pump.
(6) Frequently clean the attachments and cotton on the equipment to ensure that the environment around the equipment is clean to prevent other accidents.
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