188 results about "High-temperature corrosion" patented technology

The invention discloses an integrated preparation method of a SiC-based composite material environment barrier coating in the technical field of aviation thermal structure materials, which comprises the following steps: cleaning a substrate, carrying out vacuum impregnation of phenolic resin and curing, coating Si slurry to form a bonding layer, coating rare earth silicate slurry to form a barrier layer, and drying to obtain the SiC-based composite material environment barrier coating. And finally carrying out high-temperature heat treatment in an inert atmosphere. According to the method, through an integrated slurry coating and gradient curing process, the performance of a base body is protected, and meanwhile efficient preparation of the coating is achieved; by adopting an integrated slurry coating and gradient curing technology and combining with an optimized medium-temperature sintering process, the matrix performance is effectively protected while the compactness of the coating is ensured, the bonding strength and interface stability of the coating are improved through the design of the phenolic resin transition layer and the silicon bonding layer in cooperation with the rare earth silicate barrier layer, and the bonding strength of the coating is improved. And the coating shows excellent protection performance in a high-temperature corrosion environment.

The invention relates to the technical field of rare earth metal electrolysis cathode protection coatings, in particular to a high-temperature-corrosion-resistant yttrium-stabilized zirconia gradient coating on the surface of a tungsten cathode. A metallurgically bonded strong bonding bottom layer is constructed on a tungsten substrate through surface pretreatment and reactive sintering, then an atmosphere plasma technology is adopted to spray a creep-resistant gradient layer with continuous components to buffer thermal stress, and finally a sol-gel technology is utilized to construct an extremely compact corrosion-resistant surface layer in a superposition mode. The high-temperature-corrosion-resistant yttrium-stabilized zirconia gradient coating is constructed through a multi-scale and multi-mechanism synergistic effect, the problems that a tungsten cathode coating is insufficient in binding force and poor in thermal shock resistance are fundamentally solved, molten salt permeation can be blocked, and the service life of a tungsten cathode in a severe environment is remarkably prolonged.

A corrosion inhibitor composition includes a fatty acid ethoxylate, a thiourea, an arylthiourea, a thiazole, and two or more solvents. A metal article in contact with the composition has a corrosion rate of about 25 to about 45 mils penetration per year (mpy), as determined by an ASTM G111 standard test method. A method for inhibiting corrosion of a metal in contact with a corrosive fluid.

The invention discloses a preparation process of a sintering kiln silicon carbide guide roller with thermal shock resistance and high-temperature corrosion resistance. The process comprises the following steps: sequentially carrying out surface pretreatment such as reticulate pattern laser engraving, sand blasting and cleaning and drying on a silicon carbide guide roller substrate; performing plasma spraying on a pure aluminum oxide coating after preheating; carrying out segmented laser remelting on the coating to improve the compactness; and finally, coating the nano silicon carbide slurry, calcining and curing. The thermal shock resistance and the high-temperature corrosion resistance of the guide roller are remarkably improved by enhancing the binding force of the coating through laser engraving, optimizing the density of the coating through laser remelting and combining post-treatment of nano silicon carbide slurry, and the service life of the guide roller in a lithium battery positive electrode material sintering kiln is prolonged.

The invention belongs to the technical field of boiler heating surface high-temperature corrosion monitoring, and relates to a boiler heating surface high-temperature corrosion online monitoring method and system based on data fusion. The method comprises the following steps: acquiring an electrochemical signal, infrared thermal image data and acoustic emission characteristics of a key corrosion sensitive area of a boiler heating surface; based on data collected by a sensor network, a corrosion rate dynamic prediction model composed of a physical driving sub-model and a data driving sub-model is adopted to obtain a final corrosion rate prediction value; fusing the infrared thermal image data and the acoustic emission features, calculating a regional corrosion risk confidence coefficient according to the fused infrared thermal image data and acoustic emission features, and outputting a confidence coefficient level according to the regional corrosion risk confidence coefficient; and outputting an early warning signal according to the final corrosion rate predicted value and the confidence level, and dynamically adjusting combustion parameters. Accurate prediction of high-temperature corrosion of the boiler heating surface is realized, and corrosion development of the boiler heating surface is actively inhibited.

The invention discloses a high-temperature-resistant and corrosion-resistant coating for an aluminum alloy heat exchange tube and a preparation method thereof, and relates to the technical field of coating materials. The method comprises the following steps that the aluminum alloy heat exchange tube is cleaned and deoiled, then a treating agent is sprayed, composite coating slurry is sprayed to the surface of the aluminum alloy heat exchange tube after curing, and the high-temperature-resistant and corrosion-resistant coating for the aluminum alloy heat exchange tube is obtained after curing treatment. Wherein the treating agent is prepared from NS-30 silica sol, deionized water and methyltrimethoxysilane; the composite coating slurry is prepared from a polyamide acid solution, a synergist, functionalized boron nitride nanosheets, modified hexagonal boron nitride, a flatting agent and a defoaming agent. The silane film introduced into the treating agent and the synergist, the functionalized boron nitride nanosheet and the modified hexagonal boron nitride introduced into the composite coating slurry effectively improve the high temperature resistance, the corrosion resistance, the adhesive force, the thermal conductivity, the aging resistance and the toughness of the coating. Therefore, the method has a wider application prospect.

The invention belongs to the technical field of thermal power heating surface treatment, and provides a boiler heating surface high-temperature corrosion protective coating and a preparation method thereof in order to solve the technical problems that in the prior art, a nano ceramic coating and a metal alloy coating for treating thermal power boiler heating surface high-temperature corrosion are insufficient in adhesive force, prone to falling off and short in protection service life. Through multi-layer structure design and technological parameter optimization, a coating system has continuous thermal expansion coefficient gradient distribution in the interval of 500-900 DEG C, the metal bonding layer at the bottom layer has a pore structure which can effectively absorb thermal stress, the nano ceramic layer at the surface layer can maintain high-temperature stability, and it is verified that the overall bonding strength is larger than or equal to 35 MPa, and the thermal expansion coefficient is larger than or equal to 10%. Compared with a traditional single-layer coating, the adhesive force is improved by 200% or above, and therefore the technical problems that in the prior art, adhesive force is insufficient, thermal stress is not matched, and high-temperature softening fails can be effectively solved.

The invention belongs to the technical field of boiler heating surface high-temperature corrosion monitoring, and relates to a boiler heating surface temperature monitoring method and system based on dynamic heat flux density monitoring. The method comprises the steps of obtaining temperature field data of a plurality of monitoring areas of a boiler heating surface; constructing an improved Tikhonov regularization algorithm based on the temperature field data, and carrying out heat flow field reverse solution by adopting the improved Tikhonov regularization algorithm to obtain reconstructed heat flow field distribution and a heat conduction nuclear matrix after regularization optimization; and generating a temperature evolution trend by adopting a GRU prediction model based on an attention mechanism based on the reconstructed heat flow field distribution and the regularized and optimized heat conduction nuclear matrix. The method can accurately predict the temperature evolution trend through obtaining the comprehensive temperature field data, facilitates the real-time monitoring of the temperature of the heating surface of the boiler, and improves the safety and reliability of the operation of the boiler. Operation personnel can adjust operation parameters in time according to a prediction result, and the operation state of the boiler is optimized.

The invention discloses a high-flame-retardant temperature-resistant corrosion-resistant optical fiber composite cable and a preparation method thereof, and belongs to the technical field of cable manufacturing, and the high-flame-retardant temperature-resistant corrosion-resistant optical fiber composite cable sequentially comprises an optical fiber unit, a conductor layer, an insulating layer, a shielding layer, a corrosion-resistant layer and a sheath layer from inside to outside. The optical fiber unit adopts a ceramic silicone rubber buffer layer; the conductor layer is a nickel-plated copper alloy stranded wire, and the oxidation resistance is enhanced through nano titanium dioxide sol treatment; the insulating layer is of a three-layer co-extrusion structure; the shielding layer adopts an aluminum-plastic composite belt and tinned copper wire braided composite structure; the anti-corrosion layer is a polytetrafluoroethylene film subjected to plasma treatment; the sheath layer is made of two-component ceramic silicone rubber, is flexible after being vulcanized at normal temperature, and is converted into a ceramic body at high temperature. According to the optical fiber composite cable, through the collaborative design of a multi-layer structure, the performance of excellent continuous use stability, high salt mist environment corrosion resistance and the like is achieved, the optical fiber composite cable is suitable for high-temperature, corrosion, fire and other severe environments, and the safety and durability of the composite cable are remarkably improved.

The invention discloses a near-wall air device for preventing high-temperature corrosion of a front and back wall hedging pulverized coal boiler, and relates to the technical field of application of near-wall air of pulverized coal boilers. The close-to-wall air device for preventing the high-temperature corrosion of the front and rear wall hedging pulverized coal fired boiler comprises a close-to-wall air nozzle arranged on the side wall of a hearth, the hearth comprises a furnace wall, the side wall of the hearth is provided with a plurality of wall-type arranged over fire air nozzles and wall-type arranged burner nozzles, and the close-to-wall air nozzle is arranged on the side wall of the furnace wall in a penetrating mode. By means of the wall-attached air nozzles, in the using process, according to the requirement for preventing high-temperature corrosion of the boiler in the reducing atmosphere, multiple layers of wall-attached air can be arranged on the wall face of the side wall of the hearth, each layer of wall-attached air comprises the multiple wall-attached air nozzles, and the area, prone to high-temperature corrosion, of the wall face of the boiler can be completely covered; the oxidizing atmosphere of the near-wall area is formed, the risk of high-temperature corrosion of the water cooling wall is effectively avoided, and meanwhile the air volume corresponding to each piece of near-wall air can be adjusted according to actual needs.

The invention provides a high-temperature-erosion-resistant Fe-based amorphous coating welding wire and a preparation method, and belongs to the technical field of metal materials. The welding wire comprises a flux core and a welding skin. Wherein the flux core comprises 25%-28% of Cr powder, 23%-25% of Nb powder, 8%-10% of B powder, 8%-10% of Si powder, 15%-17% of Mo powder, 8%-10% of W powder and the balance Fe powder; and the welding skin is a Fe60Cr40 steel strip. According to the novel Fe-Cr-Nb-B-W-Si-Mo series amorphous alloy welding wire, by optimizing the proportion of multiple components, the coating is endowed with excellent wear resistance, high temperature corrosion resistance and erosion resistance while the high amorphous content is ensured. The welding wire can adopt a conventional electric arc surfacing process, efficient protection of the surface of the water cooling wall is achieved under the low-cost condition, and an innovative solution is provided for long-acting protection of key components of a power plant.

The application provides a surface-coated anti-corrosion dioxin-resistant silicon carbide wear-resistant powder material, and relates to the technical field of silicon carbide materials. The material takes cubic crystal type beta-SiC nano powder as a matrix, realizes the combination of high-temperature corrosion resistance, high wear resistance and high-efficiency dioxin prevention by constructing a gradient coating structure of 'Si-O-C transition layer / ZrO2-Al2O3-Y2O3 middle layer / SiO2-rare earth oxide-phosphotungstic acid multifunctional outer layer'. The preparation method of the material comprises key steps of matrix etching, transition layer construction, hydrothermal deposition and atmosphere calcination, and the process is controllable and has good repeatability. The obtained powder has excellent long-term protection performance, good dispersibility and stable structural integrity, and is suitable for fields of wear-resistant coating, composite reinforcement and waste gas treatment in harsh environments.

The utility model provides an independent circulation pipeline evaporator which comprises an ascending pipe connected to a steam pocket; the first evaporation screen is communicated with the ascending pipe through a first ascending communicating pipe, the first evaporation screen comprises a plurality of first pipe pieces, and the first pipe pieces are arranged on two flues in parallel; each first duct piece is arranged in a bow shape in the vertical direction, so that the heating area of each first duct piece is increased, and meanwhile, a steam soot blower can penetrate through each first duct piece and carry out decoking and soot cleaning on each first duct piece; the first descending communicating pipe is connected between the first evaporation screen and a descending pipe, and the descending pipe is connected to the bottom of the steam pocket and used for conveying water in the steam pocket to the first descending communicating pipe and then conveying the water to the first evaporation screen. The problems of overtemperature and high-temperature corrosion of the superheater mentioned in the background technology are solved.

This invention provides an air supply and dust removal device for high-temperature corrosion prevention and control in coal-fired power plant boilers, comprising a cyclone separator and a microporous filter. The cyclone separator includes a separation shell, an air inlet, an exhaust outlet, and a first ash discharge outlet. The separation shell has a cylindrical separation chamber, and the air inlet, exhaust outlet, and first ash discharge outlet are respectively connected to the separation chamber. The air inlet is located at the upper part of the separation shell and is tangent to the outer wall of the separation shell. The exhaust outlet is located at the top of the separation shell, and the first ash discharge outlet is located at the bottom of the separation shell. The microporous filter includes a filter shell and a microporous filter element. The filter shell has an air inlet and an exhaust outlet, with the air inlet connected to the exhaust outlet. The microporous filter element is disposed inside the filter shell. The cyclone separator performs primary dust removal of large particles in the secondary air, and the microporous filter performs secondary dust removal of small particles in the secondary air, thereby achieving the removal of both large and small particles of dust in the secondary air.

The application provides a kind of air supply system for power station boiler high temperature corrosion prevention and control equipment, including secondary air main pipe, main pipe connecting pipe, prevention and control air main pipe, main pipe adjusting assembly, at least two shunt branch pipes and at least two groups of branch pipe adjusting assembly;Main pipe connecting pipe connects secondary air main pipe and prevention and control air main pipe, main pipe adjusting assembly includes the main pipe adjusting valve and pressure interlock controller of main pipe connecting pipe, pressure interlock controller is used for controlling the opening of main pipe adjusting valve according to the pressure in secondary air main pipe;Shunt branch pipe is connected with prevention and control air main pipe respectively, and a group of branch pipe adjusting assembly is correspondingly provided in each shunt branch pipe, and branch pipe adjusting assembly includes branch pipe adjusting valve and differential pressure interlock controller, and branch pipe adjusting valve is arranged in corresponding shunt branch pipe, and differential pressure interlock controller is used for controlling the opening of shunt branch pipe according to the pressure difference between inside and outside of corresponding shunt branch pipe.The system of the application supplies air continuously and stably, improves corrosion prevention and control effect, reduces operation and maintenance cost, prolongs the service life of pipeline.

Provided are a high-temperature corrosion-resistant stranded conductor and a method for manufacturing the same, which relate to the field of high-temperature conductor technologies. The stranded conductor is formed by twisting a plurality of composite wire monofilaments, each including a highly conductive core wire made of copper or a copper alloy, and a high-temperature corrosion-resistant alloy cladding the core wire. The stranded conductor is capable of maintaining strength and transmitting a signal under a high-temperature atmospheric environment below 1000° C. for an extended period of time. By employing a plurality of twisted composite wire monofilaments with the above structure, the conductor achieves high strength retention, stable electrical conductivity, and superior oxidation / corrosion resistance when operating long-term under operating conditions of 600° C. to 1000° C. This solves the technical problem of conventional conductors failing in high-temperature environments.

The utility model discloses a complete cooling copper water jacket for a coal gasification hearth, which comprises an upper hearth water jacket, a lower hearth water jacket and a slag discharge port water jacket which are sequentially arranged on the inner wall of the hearth from top to bottom in the vertical direction, and the hearth water jacket comprises a conical wall body and a lower hearth connecting flange. The lower hearth water jacket comprises a horn-shaped wall body, an upper hearth connecting flange and a slag discharge port connecting flange, the lower hearth connecting flange and the upper hearth connecting flange are fixed through bolts, and the slag discharge port water jacket comprises a funnel-shaped wall body and a sealing flange. A cooling pipe circling along the wall body is arranged in each of the conical wall body, the horn-shaped wall body and the funnel-shaped wall body. The complete cooling copper water jacket for the coal gasification furnace solves the technical problems of poor high-temperature corrosion resistance, poor cooling effect, inconvenience in replacement, assembly and disassembly and short service life.

The application discloses a nano-structure thermal protection coating for hydrogen fuel gas turbine and a preparation method thereof. The nano-structure thermal protection coating takes high-temperature alloy as a substrate, and sequentially deposits a bonding bottom layer, a yttrium stabilized zirconium oxide or zirconate intermediate layer and a silicate top layer on the surface of the substrate. The application starts from the design of the coating structure, and aims at the problems of low service temperature and poor water-oxygen corrosion resistance of the existing thermal protection coating for gas turbine. The water-oxygen corrosion resistance function of the silicate material is superimposed on the thermal protection coating for gas turbine, and the coating structure is optimized to form a new thermal protection coating structure resistant to high-temperature corrosion. The new thermal protection coating structure can not only meet more extreme service environments, but also resist water-oxygen corrosion at high temperature. The new thermal protection coating structure is suitable for hydrogen fuel power generation gas turbine, and is also suitable for hydrogen fuel or hydrogen mixed marine engines, hydrogen fuel rocket engines and other hydrogen fuel gas turbines.

This invention relates to a high-temperature corrosion-resistant Fe-Cr-Mo-Ni alloy, its preparation method, and its applications. The alloy composition is 37%–40% Ni, 19%–29% Cr, and 5%–10.27% Mo, with the balance being Fe and trace impurities. X-ray diffraction of the alloy reveals a single-phase face-centered cubic structure. After holding at 800℃ for 400 hours, the area fraction of the σ phase in the microstructure does not exceed 5%. The breakdown potential in 3.5% NaCl solution is as high as 1.029 V, and its pitting corrosion resistance is superior to commercial 904L stainless steel. This alloy shows great promise for industrial application in the preparation of high-temperature resistant structural components operating under high corrosion conditions above 400–900℃, especially in service environments containing chloride ions, fluoride ions, or sulfides.

The invention relates to the technical field of single crystal furnaces, in particular to an anti-corrosion straight pull type single crystal furnace auxiliary furnace which comprises an auxiliary furnace main body, a driving mechanism and a plurality of lining plates arranged in the circumferential direction of the inner side of the auxiliary furnace main body. A channel used for drawing and forming a monocrystalline silicon column is defined by the inner lining plates, and the inner lining plates are in sliding fit with the rotating wheel disc and the bearing ring correspondingly and synchronously deflect and move in the radial direction under the action of the driving mechanism, so that the aperture of an inner hole of the auxiliary furnace is continuously adjustable. An interlayer cavity is formed between the inner lining plate and the auxiliary furnace main body, inert gas is introduced into the interlayer cavity, and a directional air curtain is formed through an air guide channel in the inner lining plate and an air distribution strip, so that corrosive gas is isolated and protected. And the inner lining plate adopts a detachable structure, so that the auxiliary furnace main body can be effectively isolated in a high-temperature corrosion environment and is convenient to replace. The auxiliary furnace has the advantages of being large in aperture adjusting range, high in atmosphere corrosion resistance, convenient to maintain and suitable for drawing of monocrystalline silicon columns of multiple specifications.

The utility model discloses a novel plunger type well drilling throttle valve, including throttle valve body and throttle valve control part, the throttle valve body has the liquid inlet buffer cavity and respectively with the installation hole, the liquid outlet hole, the connecting hole who communicates with the liquid inlet buffer cavity, the installation hole is equipped with the positioning piece, alloy erosion -resistant bushing, valve seat in proper order, the throttle valve control part includes drive arrangement, transmission main shaft, positioning short section, end sleeve, valve body gland, valve core, valve cage, valve rod connecting piece, valve core connecting bolt, valve rod, this novel plunger type throttle valve uses high temperature corrosion -resistant alloy at the fluid impact site and is designed as can be individually detached replacement structure, and the on -the -spot maintenance of equipment is convenient, and the whole structure is stable in operation, and the life is longer, and there is no larger vibration and noise in operation, and the starting torque is low, and the personnel operation is simple, and the special treatment of material can greatly increase the equipment use stability and security under the mud impact environment.

The utility model provides a waste heat recovery device for a steam pipeline, belongs to the technical field of waste heat recovery, and aims to solve the problems that high-temperature and high-pressure steam is transmitted for a long time in a conveying pipeline with too many bends, the consumption is high, the efficiency of converting the high-temperature steam into electric energy is not high, a pipeline system is complicated, and the conveying process needs to be detected. The heat utilization mechanism is mounted in the steam conveying pipeline; one end of the conveying mechanism is fixedly communicated with the heat utilization mechanism; the liquid control mechanism is communicated with the conveying mechanism; the steam conveying pipeline is arranged in the steam boiler and is resistant to high temperature and corrosion, the heat preservation performance is high, and a steam pipe network is monitored in real time; the heat utilization mechanism is inserted into the steam conveying pipeline to improve the steam utilization rate; high-temperature and low-temperature liquid flows in or out in a one-way mode, and auxiliary absorption of waste heat is rapidly completed.

The invention discloses a high-temperature corrosion-resistant continuous wet oxidation treatment system and method. The system comprises a wastewater pretreatment module, a pressurization preheating system, a wet oxidation reactor module, a depressurization cooling system and a gas-liquid separation and tail gas treatment module which are connected in sequence. The treatment method comprises a pretreatment stage, a pressurizing and preheating coupling stage, a gradient oxidation reaction stage, a stepped depressurization waste heat recovery stage and a gas-liquid separation and tail gas purification stage. According to the continuous flow tubular reactor structure disclosed by the invention, deep mineralization of organic pollutants is realized by combining the strong oxidizing property of wet oxygen at high temperature and high pressure, the COD (Chemical Oxygen Demand) removal rate can reach 90% or above, and the biodegradability of effluent is greatly improved; heat energy in high-temperature outlet water is fully recycled through the pipe sleeve type heat exchanger to preheat fed materials, and the requirement for an external heat source is reduced; a temperature fine-adjustment heater is arranged in an auxiliary mode, and total energy consumption is further saved; the pressure reduction coil pipe controls stable release of liquid outlet pressure, and the problems of equipment impact and corrosion caused by vapor-liquid flash evaporation are effectively prevented.

Provided is an alloy material that has excellent weld high-temperature cracking resistance and excellent high-temperature corrosion resistance. This alloy material has a chemical composition including, by mass %, C: 0.050-0.100%, Si: 1.00% or less, Mn: 1.50% or less, P: 0.035% or less, S: 0.0015% or less, Cr: 19.00-23.00%, Ni: 30.00-35.00%, N: 0.010% or less, Al: 0.30-0.70%, Ti: 0.30-0.70%, Cu: 0.20-1.00%, Nb: 0.001-0.100%, and B: 0.0005-0.0050%, the remainder consisting of Fe and impurities, and satisfies expression (1), expression (2), and expression (3).　(1): 2Al+Si≥0.75　(2): 26.716–2.99Si–0.174Mn–0.757Cr–0.27Ni–0.38Cu+5.45Nb–586B≤2.00　(3): 56.3–3.5Cu+666B≤56.80

An oxidizing furnace belongs to the technical field of titanium dioxide production equipment. According to the invention, the problems of intensified high-temperature corrosion of high-temperature gas to a refractory lining on the inner wall of a heating section due to non-uniform circumferential distribution of oxygen entering the heating section of an existing oxidation furnace and non-uniform circumferential pressure distribution of titanium tetrachloride in a reaction section of the existing oxidation furnace are solved; and the distribution uniformity of the particle size of the titanium dioxide product is influenced by non-uniform mixing with high-temperature oxygen. The sealing head bluff body, the special-shaped bluff body and the fireproof lining form an annular cavity with an opening in one end, a plurality of oxygen inlet pipes are inserted into the shell in the circumferential direction and penetrate through the fireproof lining to be communicated with the annular cavity, and the reaction section comprises a feeding cavity, a titanium tetrachloride inlet pipe, a reaction pipe, an inert gas spraying device and a plurality of rectifying plates. The method is used for preparing the titanium dioxide particles.

The application belongs to the technical field of surface protection, and discloses a double-layer coating for a boiler heating surface and a preparation method thereof; wherein the double-layer coating comprises an inner layer coating and an outer layer coating; in the inner layer coating, the mass percentage of rare earth oxide is 0.1% to 0.3%, and the mass percentage of Inconel 625 is 99.7% to 99.9%; the outer layer coating is used for spraying on the surface of the inner layer coating, and in the outer layer coating, the mass percentage of Cr3C2 is 30% to 50%, and the mass percentage of Inconel 625 is 50% to 70%. The double-layer coating provided by the application has extremely excellent high-temperature chlorine corrosion resistance of the inner layer coating, and on the basis of the high-temperature corrosion resistance of the outer layer coating, the outer layer coating has extremely excellent erosion resistance, and can effectively prolong the service life of the boiler heating surface tube bundle steel.

The utility model discloses an anti-loosening protective cover for a top cover bolt of a gasification furnace, which relates to the field of gasification furnaces, comprises an outer protective shell, an end head, a connecting part and a pressing part, and is characterized in that the outer protective shell is sleeved on the outer side of the bolt and is fixedly connected to the top of a top cover; the end cover is arranged at an opening in the top of the outer protective shell, and the connecting part is used for connecting the end cover and the outer protective shell, so that the end cover is detachably mounted at the top end of the outer protective shell. Therefore, looseness of the bolt caused by stress relaxation and mechanical vibration is effectively restrained, sealing connection between the gasification furnace top cover and the combustion chamber is guaranteed, medium leakage is prevented, the bolt is completely sealed through the outer protective shell and the end cover, erosion of high-temperature corrosion or dust environment to the surface of the bolt is isolated, the service life of the bolt is prolonged, and the service life of the gasification furnace is prolonged. The loosening risk is reduced, and the safety and the stability of the gasification furnace are improved.

This invention discloses an ultra-high temperature corrosion-resistant mechanical packer suitable for use with coiled tubing, comprising a sealing seat and a sealing head, wherein the sealing head and sealing seat are connected by a helical toothed outer cylinder. The sealing head comprises an anchoring structure, a coiled tubing sealer, and a slip locking sleeve connected in sequence, wherein the helical toothed outer cylinder and the coiled tubing sealer are connected together. By changing the packer material, the structure of the device is further modified, effectively solving the problem of achieving a good sealing effect that existing technologies cannot achieve, thereby improving the cementing process by changing the sealing method. Therefore, this invention effectively isolates corrosive media in the producing formation from contact with the upper tubing body through a high-temperature resistant mechanical packer, significantly reducing the material grade of the tubing, slowing down the corrosion rate and degree, effectively extending the service life of the tubing string, ensuring wellbore integrity, and significantly reducing well construction costs.

The application discloses a kind of anti-fouling coating for boiler coal burner nozzle, coating and preparation method thereof, and the coating includes the following mass percentages of components:65~75wt% ceramic aggregate, 2~4wt% silicon dioxide, 1~3wt% chromium green, 0.5~2wt% magnesium oxide, 4~6wt% curing agent, 9~10wt% adhesive and 8~12wt% diluent;Ceramic aggregate includes zirconium silicate and hexagonal boron nitride;Silicon dioxide includes hydrophobic fumed silica and conventional scale silicon dioxide;Adhesive is aluminum dihydrogen phosphate.The coating is thermally cured into shape by using the temperature rise after boiler operation, which has low surface energy, smooth ceramic glaze and excellent performance of high temperature corrosion resistance, can effectively prevent the coking and plugging of burner nozzle, prolong the service life of burner, and has good application prospect.