Along with the rapid progress of China's semiconductor industry and China's display industry, we are also growing along with this industry. Therefore, through a brief introduction of some projects, let this technical development play a role in China's clean room and semiconductor industry. The role, because the working environment is quite high.
In terms of scope, there are wide-pass air-conditioning systems, clean decoration, epoxy coating, self-leveling, PVC flooring, air-flooring, bulk gas systems, special gas systems, chemicals, pure water, which we have reached 18.2 trillion. Level, this is the highest level in the world. There are also some waste water and others.
This is the first NEC electronic engineering production line in our country. The monthly investment is 8,000 pieces. Then, these two projects are the early stage of our construction of modern electronics factory. We regard it as a high-tech factory in the early stage.
From the clean room, it is a more comprehensive, because of the time, we can not do a comprehensive introduction, can only be introduced from the aspect of air conditioning. It is also a revolutionary environment solution for our country.
This is our typical early solution. The personnel and workshops of this semiconductor factory are in this position. Then, the upper and lower are new fans, then its working principle is to have a repeated high-efficiency action on the top of the ceiling. The top two are recirculating air conditioners, which can also be placed on top or on the side. The fresh air is replenished by the new fan unit, the return air from the clean room is passed through the circulating fan, and the cooling and humidity are adjusted by the circulating fan, then sent to the static pressure box for mixing, and then circulated through the top to the workshop.
In this way, our entire gas is different from our large air conditioner. Our large air conditioners may have only a few features, here all the air is pressed down from the top. This is the principle of the modern clean room that we achieved in the first step, which has reached level 100 or above.
What is the concept of level 100? For example, the environment that everyone is doing today is a very clean environment that we see. How many levels should it be? It is 2 million to 3 million, which is more than 5 particles per cubic foot, which is equivalent to 3.05 square meters. What is the micron of more than 0.5 in such a large volume? Well, our environment today, I estimate it is between 2 million and 3 million G. Then, such a clean room can reach 100 microns, which is no more than 100 microns, and less than 100 microns.
Before our ICs were packaged, their wires were conservatively 0.08 microns, or 0.07 microns. So, all three circuits produce this, so the environment is critical to the finished product. This is a clean room that has reached level 100.
Well, by the end of the 1990s, such as Changhong and other manufacturers, we got a 909 project started. The clean room has a construction area of 13,000 square meters and a clean area of 1G. So what I said just now is level 100, so now I am talking about level 1. The 0.5 micron or above that I mentioned earlier is 100, so the requirement here is higher, 0.12 micron. Therefore, the technology of the clean room has been further improved.
Exchange the temperature through the dry coil and go up from here on both sides. Going to the static pressure box above us, and then passing another brand new device, is FFU, what does this mean? It is a high-efficiency air filter unit that goes down through it. The fresh air conditioner is here, we have to send it up. From the perspective of innovation, it is the use of FFU.
It solves our previous principle from the working principle. What is the previous process? Although it is completely pressed from the top, our air cleanliness determines the form of air flow. In theory, it is necessary to strictly press each air down vertically and press it all down. In this case, our air will be quite clean. However, in fact it will be very difficult to do.
Where is the difficulty? We can see that it is sent by an external fan, and it is pressed down here after being sent in. Then, there must be a problem of unbalanced resistance. If the resistance is high, the wind speed will be large, and if the resistance is small, the wind speed will be small, and the verticality of the wind body cannot be strictly guaranteed.
We are here to put the entire roof, guaranteeing the vertical situation, so that we can achieve level 1. What is the concept of level 1? That is 1 square meter can only be 1 micron, but it can't be done, because you can't follow the 60 points test, you can follow the 60 points test, you may be 58 points. Therefore, you have to go to 70 points and 80 points, so 1 micron is equal to not doing.
At this level, our purification is related to the material density of the FFU. The greater the material density, the more airflow, but the problem is that the amount of air circulation is very large. Then, the requirements of our channel here are very spacious, so the greater the amount of air, the greater the amount of air treatment. Every time we cycle in the air, there is a temperature rise, and the temperature will increase, so it will cool. Therefore, the amount it handles is large, and the resistance here increases.
So the problem with the previous approach is that all the air has to be turned over from here. Then, the whole is full, and the temperature can't be dealt with.
This is the clean room
of Shanghai Radio and Television, and his area has reached 50,000 square meters. So, the problem it brings is that there is a problem called RHU here to solve the problem. This area is our workshop, so the cost of our clean room is very expensive. The only thing that is really used for production in such a big house is the small place. There are fans in the high level and fans in the lower level.
The outdoor air blower below purifies the indoor air, and the purified exhaust gas discharges the indoor air. Send the fresh air through the RHU device. This equipment not only controls the indoor temperature, but also increases the power of the air supply, reducing the resistance ratio brought about by the previous talk, speeding up the air circulation, and the speed is effective. In other words, the RHU is chosen to reduce the lighting system.
This is a newly completed project with a clean area of 12,000 square meters. The area of the clean room we usually see is very small, and a few hundred square meters is good. Well, this method is almost the same as the one just mentioned, but as a small difference, the RHU equipment is not located in a corner, it can be added under the entire layer. Well, this is the workshop in the room setup. The restrictions on the production equipment in the workshop become smaller, and the arrangement rate of the RHU below can be continuously increased. Therefore, the treatment of the temperature and humidity of the air has been improved. This allows the air to come back here and then process it back to the clean room.
It solves the problem of technical upgrades that often occur in our factories, as technology upgrades bring equipment adjustments. The number of heat and humidity in the device is not stable, and as it changes, it can be resolved by increasing the RHU decomposition. So, this makes a factory very flexible and usable. We know that the cost of a clean plant is very high, so this can increase utilization. The construction of the clean room is getting bigger and bigger. This is the construction of a clean room in a display company in Sichuan. They are currently the largest clean room in China, with an area of 20,000 meters. This method still uses the RHU method. They have high requirements for clean rooms. Their air handling capacity is relatively small. They also have FFU, which is single-density air. It is processed by FFU and sent to clean room and clean room. Going back to the next layer through the floor is such a cyclic process. If the level is increased, then this can be more mature.
In view of the current popular promotion of energy saving and emission reduction, we also made a comparison of the experience values of clean rooms. This is the earliest clean room in our country. Their energy consumption, based on the increase of inventory rate, is based on the tonnage of energy consumption per square meter. When we are currently using the FFU approach, we can see that almost half of the cleanrooms have reached 50%.
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