Henan Hongtai Kiln Refractory Co.,Ltd.
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High Chrome Oxide Brick Refractory brick
High chromium brick is a kind of shaped refractory product with the content of chromium trioxide not less than 75% and the combined content of chromium trioxide, alumina and zirconia not less than 98%, which is made of industrial grade chromium trioxide and alumina as the main raw materials, or with a small amount of zirconia, etc.It has excellent corrosion resistance, high pressure strength at normal temperature, high temperature strength, excellent wear resistance, high refractoriness, excellent thermal shock resistance, high temperature volume stability and other characteristics.
Operating temperature had a great influence on the service life of high chrome brick, the higher the temperature, cut loss rate, the greater the service life of the brick is lower, in coal-water slurry gasifier work environment, because of the high temperature and lower or significantly reduce the service life of high chrome brick due to the nature of high temperature change or change the viscosity-temperature characteristics of coal, the higher the temperature, the lower the viscosity, liquidity, the better, erosion and penetration of brick is more serious, the greater the erosion rate, the lower the service life, after long-term research and use the results of statistical, above the appropriate operating temperature, every 100 ℃, and increased erosion rate of high chrome brick increases by 4 times or each additional 44 ℃,The erosion rate of bricks doubles.
The operating temperature is related to the ash melting point and viscosity of coal cinder, and the ash melting point and viscosity of coal cinder are directly related to the coal quality of raw coal.The research and practice at home and abroad think that the appropriate operating temperature should be higher than the cinder ash melting point of about 50℃ or higher than the optimal slag viscosity melting temperature of 20 ~ 50℃.The ash melting point of cinder should be lower than 1300℃, and it is best to control it at 1250-1300℃.The viscosity should also be controlled within an appropriate range of 15 ~ 25Pa·s, which can not only ensure that the slag forms an effective protective layer on the working surface, but also maintain a certain fluidity and do not block the slag discharge port.The viscosity at the appropriate operating temperature is best controlled between 25 and 35Pa·s.
As the consumption layer of high temperature resistance, erosion resistance and erosion resistance, high purity chromium oxide material is generally selected, commonly called chromium-aluminum-zirconium brick or high chromium brick. It is required that this part of refractory material has excellent high temperature resistance, high creep resistance strength, thermal shock stability and high temperature chemical stability.In the process of use, the main damage factors of high chromium brick for gasifier are as follows:
(1) chemical erosion
The high chromium brick is mainly eroded by slag, followed by the strong reducing gas in the furnace.In addition, SiO2 and CaO in the slag strongly permeate into the brick and react with the refractory components to form a thicker metamorphic layer.The erosion of high chromium brick by CO, H2 strong reducing gas is mainly caused by the gas and impurities in the brick, such as SiO2, iron-containing oxides reaction to generate gas overflow or under the action of iron oxides reaction with CO to generate C deposition in the brick, resulting in high chromium brick bulging and cracking.
(2) mechanical wear
Mechanical wear is mainly caused by scouring of high chromium brick used in gasifier by high speed gas and carrying slag.The consequence of this scouring is that on the one hand, the chemical reaction between slag and high chromium brick is accelerated, on the other hand, the reaction products of low melting point will be taken away from the brick surface, and on the other hand, the process of spalling of the metamorphic layer and crack site of brick is accelerated.
(3) Operating conditions
The operation technology of gasifier is also the key factor that causes the damage of high chromium brick.
A) Operating temperature: it has been proved by practice that for every 100℃ increase in gasifier operating temperature, the corrosion loss rate of firebrick may increase by nearly 3-4 times.
B) Type of coal: the ash melting point of coal determines the operation temperature of gasifier.If the melting point of raw coal ash is too low, the viscosity of coal ash is very small under production conditions, which will aggravate the erosion and penetration of molten slag to hot-faced brick.The coal with high ash melting point often introduces certain additives, such as CaO and Fe2O3, to reduce its melting flow temperature to the best value when preparing CWS. But with the increase of CaO and Fe2O3, the erosion of high chromium brick also intensifies.
C) Production load and times of start and stop: according to statistics, the service life of hot brick decreases by 33% for each increase of production load by 30%;Usually every time the furnace is started and stopped, the corrosion loss of hot face brick is 5-20mm, especially when the CaO content in slag is high.
D) Burner: the experimental study and the actual field operation show that the normal injection Angle of the burner should be about 35°, if the Angle is too large, it will cause serious scour and spalling in the upper part;If the injection Angle is too small, it can not be completely gasified, resulting in lower gasification efficiency.If the burner is offset, the local erosion of furnace lining will be aggravated.
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Packaging
1. 1 ton bags in container, 25 MT/20'FCL.
2. 25kg bags in container, 25 MT/20'FCL
3. 25kg bags in ton bags, then in container, 25 MT/20'FCL
4. as the customer' request
Packaging of SK37 High Alumina Refractory Brick
1.on wooden pallets with plastic cover: wooden pallet size :930*930 or 1000*1000mm,
2.Load weight of each pallet: 1.5-2.0 tons,
Shipping of SK37 High Alumina Refractory Brick
1.Our packaging is as per customer’s request
2.Normal goods delivered by sea transport
3.Sample shipping by express
4.We will shipping and delivery goods timely, quality and quantity guaranteed, and also in accordance with the contract and customer's requirement completely.
Delivery:
15-30 days working day for large quantity. The shipment we will arrange as soon as possible. Of course, if it is a custom products, the shipping time will delay.
Sample:
Usually by EMS, DHL, UPS, TNT, FedEx. Anyway you like. Bulk order: Usually by sea.
Payment:
It can be through T/T, L/C at sight. The specific terms determined according to the quantity of the goods, etc.
Your inquiry related to our product & price will be replied within 24 hours.
Export:
Our products have been exported to many countries: Australia, Chile, USA, Russia, UK, Indonesia, etc., good quality have be approved by our clients.
1.Timely response,
Timely response to your inquiry, multiple choice recommendations based on your demand,quickly respond mails and provide solutions.
2.Free sample of dry ramming mass
Sample and trial order are accepted for the quality evaluation
3.Strict quality control
Arrange production on time and control quality strictly.
4.Shorter delivery time.
Book the earliest vessel or plane to guarantee the delivery time.
5.Professional Services
Provide all the detailed news and pictures from order to delivery;offer relative export documents and original certificate if needed;warm and considerable after-sale service.
Henan hongtai kiln refractory co., LTD. : "quality first, reputation first, customer first: it is our aim."Scientific management, strong technical force, perfect testing means, advanced technological equipment and stable product quality are the guarantee of quality service.Henan hongtai kiln refractories co., LTD sincerely hopes to cooperate with you hand in hand and in good faith.
Henan hongtai kiln refractory co., LTD. Main products are high alumina brick, clay brick, fused zirconium corundum brick, fireproof ball lightweight insulation brick, wear-resistant pouring material, corundum pouring material, low cement high strength pouring material, impermeable material, self-flowing material, plastic material, and various types of refractory materials.For different industries, the cement industry with anti-flaking high-alumina bricks, alkali resistant bricks, phosphate bricks;Boiler industry USES all kinds of brand wear-resisting brick, corundum brick, mullite brick and other finalizing materials.The company insists on "product quality is the life, enterprise integrity is the foundation", in the fierce market competition, won many users' trust and praise.The products are sold all over the country, as far as Vietnam, India, Korea, Pakistan, kazakhstan, other southeast Asian countries and regions.