With the advent of summer, high-temperature weather will continue for a long period of time. It is well-known that plating baths in PCB/FPC electroplating production lines are made of PP/PC materials. These plastic materials are very resistant to strong acids and alkalis. But for flammability, it is its fatal weakness. Nowadays, the wet process production line used online is the heating of the electric heating pipe. The electric heating pipe is directly immersed in the bottom of the plastic plating tank with an additional protective sleeve. This structure To lay a hidden danger for security, we first understand the electric heating rod. The working principle of the electric heating rod is that the electrons in the tungsten wire are under the action of the voltage, and will be subjected to the force and the directional movement. During the movement, the electrons and the electrons and the positive electric charge will collide and generate heat.
The basic common sense is that the tungsten wire needs to be heated in a vacuum, and the time of melting depends on the evaporation rate of tungsten. The heating of tungsten filaments in the air produces tungsten oxide.
The melting point of tungsten is 3410 degrees. The melting point WO3 of tungsten oxide is 1400-1600 degrees. In general, the temperature of the filament in the normal working state of the filament is about 2500 degrees, and WO3 quickly vaporizes at this temperature, so that the filament will soon be blown in the air. According to this principle, we all know that the electric heating rod is made of stainless steel tube jacket, put a tungsten wire, filled with quartz sand and sealed, and isolated from the air. Since tungsten filaments in electric heating rods are operated at high temperatures of up to 2500 degrees Celsius for a long time, the temperature of the stainless steel jackets is also in excess of 1000 degrees Celsius. This long-term high temperature environment causes the melting point of stainless steel to be around 1400 degrees Celsius, so stainless steel tubes Internal and external wall oxidation is very fast, coupled with high humidity in the environment of the workshop, high acid and alkali concentrations, deep corrosion of the stainless steel sleeve, so that the formation of trachoma in the wall of the heating rod, resulting in the internal tungsten wire exposed to the air immediately melted, Cause a short circuit and then lead to breakdown and other causes of the spark caused by direct ignition of the plastic plating tank, and the fire did not promptly lead to a large area of accidents.
In all the causes of electrical fire, the short circuit is ultimately caused, and in the short circuit fire, 90% is a short circuit due to a gradual failure. Gradual faults have a development process, and the release of power demonstrated in this process is directly manifested as temperature or arc, which is essentially an increase in leakage current. The development of faults such as over-current loads, poor contacts, and electrical heating equipment also has an accompanying increase in leakage currents. Because the leakage current is relatively small, it is often not enough for the overcurrent protection equipment (circuit breakers, fuses) to operate. The local high temperature generated by the leakage arc of several hundred milliamperes is more than 2000°C, which is enough to ignite the surrounding flammable materials. The aging and oxidation process of the outer tube of the electric heating rod is gradually formed. Therefore, it is difficult to judge the internal failure problem through naked eye observation. The concealment often leads to the occurrence of fire.
The aging of the electric heating rods, the corrosion of the protective layers of the electric heating rods, oxidation, leakage currents, and short circuits are the greatest hidden dangers of fires caused by factories. Reviewing the causes of the fires in fire-fighting factories over the years, 80% are on electric heating rods. This chronic illness has plagued circuit board companies for many years. After years of unremitting efforts and dedication, the Noko team has successfully applied the air-energy heat pump, the most energy-efficient, environmentally-friendly, safe, and hot-water constant-temperature system engineering to the PCB/FPC industry.
Let's talk about a new generation of air energy heat pump. After the world has begun to focus on energy conservation, the air has been renewed attention from all walks of life.
With the emergence of the world's energy crisis, advances in science and technology, and the country’s emphasis on environmental protection, air-source heat pump hot water as a new type of product is unique in its supply of hot water for safety, energy conservation, environmental protection, health, and sustainability. The advantage is to maintain a growth rate of 300% to 400% every year.
Chongda Workshop Application Case
Air heat pump works
Air-energy heat pump water heater is an innovative generation of hot water equipment. It is an efficient heat-collecting and heat transfer device. It uses electric energy to drive the heat pump, and the compressor, electronic expansion valve, dry filter, four-way valve in the heat pump device, Evaporator, casing condenser, fan and other major components, it successfully used the inverse Carnot principle, the compressor from the evaporator to inhale low temperature and low pressure gas refrigerant, by doing work, the refrigerant is compressed into high temperature and high pressure gas, high temperature and high pressure The gas enters the condenser and the water exchanges heat, which is condensed in the condenser into a cryogenic liquid and releases a large amount of heat. The water absorbs the heat released by it and the temperature rises continuously. The condensed high-pressure cryogenic liquid is throttled and reduced by the expansion valve, and then passes through the role of the fan in the evaporator, absorbs the heat of the surrounding air and volatilizes into low-pressure gas, and is then sucked into the compressor to compress, so that it is repeatedly cycled to obtain heat water.
Sande crown application case
The specific working process is as follows:
1. The refrigerant medium absorbs the heat of the low temperature object (outside air) in the evaporator and evaporates into gas.
2. The refrigerant gas from the evaporator is compressed by the compressor and becomes a high-temperature, high-pressure gas.
3. The high-temperature and high-pressure gas releases heat energy to the heated object (water) in the condenser, and turns itself into a high-pressure liquid.
4. The high-pressure liquid is decompressed in the throttling device, and then turns into a superheated liquid medium, enters the evaporator, and circulates the initial process.
Air heat pump schematic:
Hubei Yongchuangxin Application Case
Air source heat pump in the end how much power
Everyone said that air source heat pump water heaters can save energy. How much operating cost can be saved? Electricity consumption is only 1/4 of the electric water heater? Save 75% on electricity? In fact, the operating costs of air source heat pump water heaters are closely related to the air temperature. The higher the air temperature, the shorter the heating time of the air source heat pump water heaters. Some parameters must be known, such as how many kilowatts of heat are required to heat the cold water, the unit input power, the unit COP value, and the unit heating capacity. How much heat is required to heat cold water (3.6 million kJ = 1 kilowatt)
The formula is: Q=cm(t2-t1) Q is the heat quantity c is the specific heat capacity (the specific heat of water is 4200 J/kg. degree) m is the mass (kg) t2-t1 is the temperature difference
Air source heat pump hot water unit heating capacity (kW)
Calculation formula: Air source heat pump hot water unit heating capacity (kW/h) = Air source heat pump hot water unit input power (kW/h) X Air source heat pump hot water unit COP value (variable)
Air source heat pump hot water unit working time calculation (hours)
Calculation formula: unit working hours (hours) = heat required for cold water heating (kW) / heat source for air source heat pump heating units (kW/h)
We use 3 air-source heat pump units to heat 1 ton of 15 degrees Celsius cold water to 55 degrees Celsius. For example, the unit's input power is 2.8 kW/h, and the unit corresponds to a COP of 4.0 at a temperature of 20 degrees Celsius.
Water heating requires heat: 4200 Joules/kg. Degree x 1000 kg x (55 degrees - 15 degrees) = 168 million joules = 46.5 kilowatts (electric heating rod heating)
Heating capacity of the unit: 2.8 kilowatts/hour X 4.0=11.2 kilowatts/hour
Unit operating time: 46.5 kW / 11.2 kWh/h = 4.15 hours
Unit power consumption: 4.15 hours X 2.8 kilowatts/hour = 11.6 kilowatts (air heating). In the Pearl River Delta region, the conservative value of power saving rate is over 50%. This data can be written into the contract.
Fuxiang Technology Application Case
Air energy safety
Shenghong Application Case
Safety
Absorbing heat from the air, completely separating water and electricity, and multiple protections fundamentally eliminate potential safety hazards such as leakage, breakdown, and dry fire of the electric heating rods of the PCB\FPC production line.
Remarks: According to incomplete statistics, the number of accidents caused by leakage, breakdown, or dry burning due to the use of traditional electric heating rods in the PCB/FPC industry in China is approximately one thousand.
Efficient
a. Accurate water temperature---The patented electronic expansion valve exclusively used by Norco can be automatically adjusted according to the changes of environment and water temperature. The water temperature can be arbitrarily controlled between 35-99°C, and the water temperature deviation is less than plus or minus 3°C. (The control system used by Norco Air Energy Unit is an all-artificial intelligence system independently developed by Norco, and it can be pre-set for the start-up time. The early morning shift can be set to warm up at any time in the early morning without any personnel on duty. Electricity prices can also save a large amount of electricity.)
Remark: Accurate setting of water temperature can completely eliminate the risk of explosion due to over temperature control.
b. The water temperature is constant ---- adopts the single point joint control, satisfies the precise control of different temperature of each plating bath temperature. The water temperature is even and lasting and constant. It completely eliminates the inconvenience caused by the instability of the water temperature and the instability of the product.
c. Nocco's self-developed constant-temperature and full-intelligent control system adopts multi-point detection and control of water temperature, and incorporates imported high-precision temperature-controlled solenoid valves, which fully realizes unattended multicylinder single-cylinder timing and precise temperature rise.
