Waste incineration will produce a large amount of harmful gases during combustion, among which nitrogen oxides are the main pollutants in the atmosphere. Among various nitrogen oxides removal (denitrification) technologies, selective catalytic reduction (SCR) technology is the most widely used. Its core It is a denitration catalyst. In the waste incineration power generation industry, due to the particularity of its flue gas, the existing common medium and high temperature denitration catalysts in China cannot be applied, and it has been monopolized by foreign products for a long time. In the waste incineration industry, the current nitrogen oxide emission standard is generally 200-250 mg/Nm3. The SNCR denitration process is generally used, and the reducing agent is directly injected into the furnace for selective non-catalytic reduction denitration, which can meet the emission requirements. With the increasingly stringent national environmental protection requirements, various local governments have also proposed more stringent exhaust emission standards. The current SNCR denitrification can no longer meet the requirements, and will cause the ammonia escape from the incinerator outlet to exceed the standard. At present, NOx in the exhaust gas of the waste incineration industry increases Standard transformation adopts SCR denitration technology. Comparison of incinerator tail gas denitrification processes

With the increasing improvement of people's living standards, the country's requirements for environmental protection emissions are becoming more and more strict, and the industry has brought rapid development to the economy, but in the development, it is also necessary to pay attention to flue gas emissions meeting environmental protection standards. The low-carbon economy has become the development trend of the new era, and the denitration catalyst has also become one of the important components to meet the emission standards. At present, the functions of natural gas boilers are mainly heating, supplemented by steam production and power generation. Natural gas is recognized as a clean energy. In the early stage, it was believed that the boiler did not need environmental protection exhaust gas treatment facilities. However, at this stage, there are policy requirements for denitrification. mg/Nm3, and the emission standard in special areas is lower than 30 mg/Nm3. Jiangsu Province has formulated a solicitation standard for emission lower than 10 mg/Nm3. The current main technology is low-nitrogen combustion technology, that is, the burner is changed to low-nitrogen The burner basically meets the emission standard of 30 mg/Nm3 of NOx in the exhaust gas. The low-nitrogen combustion technology controls the combustion temperature and oxygen content to suppress the production of nitrogen oxides and control the value of nitrogen oxides in the flue gas. In this case, the thermal efficiency of the system will be reduced by about 5~10%. operating costs. Taking a 50t boiler as an example, after the low-nitrogen combustion system is installed, the boiler will consume nearly 3 million yuan of natural gas every year under the same steam condition. , carbon neutral"). Reaction principle: Selective catalytic reduction (SCR) method, that is, using ammonia as a reducing agent in a reactor equipped with a catalyst to remove nitrogen oxides. Nitrogen oxides in flue gas generally consist of about 95% NO and 5% NO2 by volume. The denitration reaction is converted into molecular nitrogen and water vapor according to the following basic reactions. The denitration reactor (that is, the denitration catalyst layer) is arranged between the boiler economizer and the air preheater. The inlet of the denitration reactor is connected with the outlet of the boiler economizer through the flue, and the outlet is connected with the air preheater through the flue. The flue gas vertically passes through the denitration catalyst layer of the denitration reactor from top to bottom. At this time, the flue gas temperature is about 280-420 °C, which is the best reaction temperature for the catalytic reduction reaction of denitration. Anhui Yuanchen Environmental Protection Science and Technology Co., Ltd. ("Yuanchen Technology" for short) is a high-tech enterprise integrating R&D, production and sales of dust removal filter bags and denitration catalysts(SCR Catalyst). Dust filter bag...

As environmental protection emission requirements become more and more stringent, bag dust removal equipment is also changing with each passing day. Today, we will introduce the main application characteristics of the new bag dust collector compared with traditional dust collectors: (1) The overall weight of the new type of bag filter tends to be lighter. There are two main reasons. One is that the dust bag is short and small, which can (and needs) achieve the close arrangement of the pattern holes in the structure, and the overall outline of the dust collector becomes smaller; The second is the use of air box pulse cleaning, which saves a lot of injection pipes compared with the line injection pulse dust collector. Of course, due to the increase in the height of the dust collector, the material and structural design of load-bearing structures such as steel frames need to be stronger, and the weight of this part is increasing; (2) The new type of bag filter sleeves mainly uses the dust bag as the core component, which occupies a small area, only about 1/2 of that of the low-pressure long bag filter (including the maintenance steel frame on both sides); The profile height is more than 2 times that of the low pressure long bag filter. Of course, the specific value can vary with different projects, but this feature is common, and there are significant quantitative differences; (3) The new type of dust collector filter bag adopts air box pulse type dust cleaning, and the specifications of the pulse valve are (1.5～2.5)×2.54cm, which is (3～4)×2.54cm submerged pulse valve which is typically configured by the low pressure long bag filter. The specifications are small, and the number is also reduced, and the economic cost is significantly reduced. In particular, the cancellation of the blowing pipe of the new type of bag filter and the fact that the dust removal unit can be taken out and replaced with bags for maintenance greatly reduces the maintenance difficulty of the dust collector, and the labor environment of the maintenance workers is relatively improved; (4) In terms of the structure of the dust collector, in order to realize off-line maintenance, the traditional low-pressure long-bag dust collector has valves at the inlet and outlet of the bag chamber, which are called sub-chamber valves and poppet valves in the industry. Compared with the pulse dust collector, the mechanical sedimentation type dust removal effect is worse, and it is not as good as the air box pulse dust collector in terms of handling the dust concentration of the flue gas; the new bag filter combines the inlet and outlet valves of the bag chamber into one, which is set in the clean air chamber. Off-line valve, which saves cost, avoids the disadvantage of many failures at the chamber valve, and also makes it inherit the characteristics of the strong mechanical sedimentation and dust removal effect of the air box pulse dust collector. It should be noted that this creates a new wea...

The WM2+2 carding is a carding designed for high productivity and quality with a patented double doffer system between the two main cassettes, featuring optimal fiber stripping in the first cassette and fiber separation in the middle zone, thus improving fiber mixing and distribution on the second cassette. In addition, the use of the double doffer in the middle zone and the addition of 2 work rollers increases the card capacity to 12 tons per day compared to conventional carding technology. Since this model uses jet air carding processing instead of the conventional work roll and peel roll type of mechanical carding, mechanical stresses on the fibers can be avoided and high product yield and quality can be achieved to the maximum extent.

Basalt fiber: a continuous fiber drawn from natural basalt, which is a continuous fiber drawn at high speed through a platinum-rhodium alloy wire drawing bushing after the basalt material is melted at 1450℃～1500℃. The color of pure natural basalt fiber is generally brown. Basalt fiber is a new type of inorganic environmentally friendly green high-performance fiber material, which is composed of oxides such as silica, alumina, calcium oxide, magnesium oxide, iron oxide and titanium dioxide. Preparation method of basalt fiber:   Compared with the melting of general glass fiber, the basalt melt has poor heat permeability and small wetting angle, so it is more difficult to control than other glass fibers during wire drawing. The technical points mainly include three aspects:   ① Basalt raw material formulation technology: The particle size of basalt raw materials and the defined range of components have a huge impact on the production of basalt fibers. It is necessary to control the raw material components within a certain range to meet the production requirements of basalt fiber.   ②Production kiln design technology: There are two types of kilns for basalt fiber production, one is a flame furnace with gas as fuel, and the other is an electric melting furnace. The design technology of the kiln is directly related to the quality and productivity of basalt fiber production.   ③Sizing formulation technology: The content of sizing agent is an important physical and chemical index of basalt fiber, which affects the appearance and performance quality of the product. At the same time, sizing agent is also one of the main raw materials with high price.   Basalt fiber properties   Basalt fiber is recognized at home and abroad as the fourth largest high-tech fiber after carbon fiber, aramid fiber and polyethylene fiber, and is known as "green and environmental protection new material in the 21st century". It has good tensile strength, high corrosion resistance and chemical stability, good insulation, high temperature and low temperature thermal stability, high elastic modulus, good thermal insulation and sound insulation properties, etc.

The dust collector bag is the heart of the dust collector. As an important dust removal accessory for the bag filter, the Nomex Needle Felt Dust Filter Bag daily maintenance precautions are as follows: 1. The old cloth bags of new technology should not be mixed to avoid different damage time from affecting the normal operation of dust removal equipment. 2. Blow the replaced cloth bag with compressed air first, and then check whether there are any holes. After the holes are repaired, keep them for replacement. If the cloth bag is stuck with dust, rinse it with water, let it dry and save it for replacement. 3. Try to set the cleaning cycle to be longer, which can reduce the outlet pressure and increase its stability. In response to this situation, you can call the technical maintenance department of the dust collector manufacturer to listen to their opinions and suggestions. The problem is not very big, and if you pay more attention, you can get it out of production. 4. For wear and tear, you need to pay attention to the air flow when you use it. If it is larger, you need to increase the automatic flow control system, which can make the machine work more stably and reduce the uneven air intake. And the addictive makes the bag perforate or break. 5. There is a distance between the dust bag and the keel, you need to pay attention to the burrs on the keel, and be careful to puncture the bag. If the ambient temperature is relatively high, you need to change the bag in time after a long time, because holes may occur. And the cloth bag should not be hung too loosely or too tightly. Too loose and easy to accumulate dust, and too tight to be easily damaged. 6. The aging of cloth bags. Mainly due to the following reasons, it is necessary to investigate the cause, take elimination measures and replace the dust filter bag. ① Hardening and shrinking due to abnormal high temperature; ②Reaction due to contact with acid, alkali or organic solvent vapor; ③ It reacts with moisture.   7. Clogging of the dust bag. When the cloth bag is clogged, the resistance can be expressed by the increase in the reading of the differential pressure gauge. The clogging of the cloth bag is the main reason for the phenomenon of cloth bag wear, perforation and falling off. For the cause of the clogging of the dust bag, check and repair according to the following table. The following measures are generally taken: ①Temporarily strengthen dust removal to eliminate clogging of cloth bags; ②Change the cloth bag partially or completely; ③Adjust the installation and operating conditions.