37results about How to "Improve dust accumulation" patented technology

The invention discloses an elliptical tube H-shaped fin heat exchanger for waste heat recovery. The elliptical tube H-shaped fin heat exchanger comprises an elliptical heat exchange tube, a plurality of groups of H-shaped fins and a heat exchanger surface, wherein the H-shaped fins are sleeved on the surface of the heat exchange tube; the heat exchanger surface consists of non-uniform triangular small wings, which are elliptically arranged, on the surfaces of the H-shaped fins around the elliptical heat exchange tube. When dusty flue gas flows through the surfaces of the H-shaped fins, the small wings disturb the fluid to enhance the heat exchange on the tube wall and the downstream side, and meanwhile, the deposition of particles on the tube wall is reduced; the pressure drop can be reduced by the elliptical tube while the particle adhesion is reduced. A plurality of longitudinal vortexes are arranged in a non-uniform manner; at the front and rear edges of the wing, the size of the small wings and the windward attack angle are larger; on the middle parts of the H-shaped fins, the size of the small wings and the attack angle are smaller; by using the device, the heat exchange surface in different flow states can be enhanced respectively, the heat exchange of the fins are effectively enhanced, the pressure drop is reduced, and the deposition of dust particles in the flue gas on the heat exchange surface is reduced, so that the heat exchanger can operate efficiently for a long time in the dusty flue gas.

The invention relates to a gasification method of a carbon-containing solid raw material and a used reactor. The gasification method is characterized by comprising the following steps of: reacting the carbon-containing solid raw material with oxygen in a reactor unit so as to generate synthesis gas, wherein ash flows downwards into a slag pool at the lower end of a gasification reactor in the slag form under the action of gravity force; allowing high-temperature synthesis gas which entrains molten ash residues to rise to a chill zone in the gasification reactor, injecting steam or/and water into the chill zone by using chilling equipment and chilling the high-temperature synthesis gas so as to freeze the molten ash residues entrained in the high-temperature synthesis gas into solid dust; introducing the synthesis gas which entrains the chilled solid dust into a dust removing unit so as to remove dust entrained in the synthesis gas; and introducing the synthesis gas into a waste boiler unit and generating steam by using process waste heat of the synthesis gas. The reactor provided by the invention isolates a gasification furnace from the waste boiler unit through respective shell and the dust removing unit is arranged between the gasification furnace and the waste boiler unit. The equipment has low wear rate and can run for a long time.

The invention discloses an H-shaped finned pipe formed by combining turbulence rods and delta vortex generators. The H-shaped finned pipe comprises a base pipe and a plurality of parallel H-shaped finsets, and the base pipe is sleeved with the H-shaped fin sets. Each H-shaped fin set comprises two fins. Multiple pairs of turbulence rods are symmetrically arranged on the windward side of the two fins, located on the two sides of the base pipe, of each H-shaped fin set, wherein one pair of delta vortex generators is arranged on the leeward side symmetrically. The turbulence rods axially penetrate through the fins on the windward side and on the two sides of the base pipe. The included angle of the incoming-flow directions of the delta vortex generators is 30 degrees-40 degrees. When smoke flows through the fins, the turbulence rods and the delta vortex generators conduct induction to generate secondary flow, disturbance is generated to fluid, and thus the purpose of heat exchange enhancement is achieved. The turbulence rods disturb airflow, the development of a boundary layer is prevented, pressure drop loss is lowered, deposition of particles in smoke on the heat exchange surface is reduced, and long-time efficient operation of a heat exchanger is facilitated.

The invention discloses a low-corrosivity environment-friendly biomass solid briquette fuel which is prepared by the following steps: pulverizing a biomass raw material, mixing the pulverized biomass raw material with fuel additives, drying, and carrying out hot pressing. The biomass raw material is composed of crop straws, peanut shells and shoddy and little fuelwood; the fuel additives are composed of a dehydrating agent, a combustion improver and a solid absorbent; and the weight ratio of the biomass raw material to the fuel additives is 100:(4-9). By using the shoddy and little fuelwood containing abundant lignin as the main biomass raw material, the abundant lignin performs the function of bonding under the combined actions of temperature and pressure, thereby enhancing the bonding strength and durability of the biomass solid briquette fuel; and thus, the biomass solid briquette fuel can not easily become loosened, and has favorable completeness in the transportation process. Nano aluminum powder used as the combustion improver can greatly enhance the combustion efficiency and combustion stability. Kaolin powder and/or coal gangue powder are/is used as the solid absorbent, thereby greatly improving the soot deposition and corrosion conditions of the heating surface, and prolonging the service life of the combustor.

The invention discloses a movable gas shock-wave ash clearing gun, and belongs to the technical filed of boiler ash clearing. The movable gas shock-wave ash clearing gun comprises an ignition controlbox; and the ignition control box specifically comprises an electrical control device, an air pipeline, a gas pipeline, a mixed ignition device, a gas delivering pipe and a set of replaceable gun barrel heads; an air inlet of the air pipeline is connected with an air source, a gas inlet of the gas pipeline is connected with a gas source, and the mixed ignition device is provided with an air inlet,a gas inlet, a mixed gas outlet, an ignition head and a connector of the ignition head; the gas delivering pipe comprises a soft connecting pipe, a hard connecting pipe and connecting accessories; and the replaceable gun barrel heads are connected with one end of the hard connecting pipe. The movable gas shock-wave ash clearing gun has the technical effects that ash clearing can be conducted in atargeted mode according to the ash accumulating situation of the heated surface of a boiler, the ash clearing efficiency is high, the movable gas shock-wave ash clearing gun is simple in structure, convenient to operate and low in production cost, and the operation failure rate of the movable gas shock-wave ash clearing gun is quite low.

The invention discloses a method for reducing ash blocking of a rotor of a heating surface rotary air preheater. When temperature sensors detect that the lowest temperature of surfaces of heat transfer elements in chambers which are located at one side of a rotor cold end is lower than 100 DEG C, an electric signal is sent to an electrical control system through the temperature sensors, the rotating speed of a rotor driven by a variable-speed motor is improved through the electrical control system, and the rotating speed of the variable-speed motor is kept until the lowest temperature of the cold end of the rotor exceeds 100 DEG C. The invention aims to provide the method for reducing the ash blocking of the rotor of the heating surface rotary air preheater, the ash accumulation and the scale accumulation on the surfaces of the heat transfer elements and the inner walls of the chambers can be reduced or avoided, cleaning of the accumulating ash on the surfaces of the heat transfer elements and the inner walls of the chambers is more convenient, the heat exchange efficiency is high, and the service life is long.

The invention discloses a heat exchanger for waste heat recovery of a coal-fired boiler. The design concept combining a section-separated heat transfer enhancement principle and a technology for flexibly adjusting the tube wall temperature through graded water supply is adopted, the heat exchanger is divided into a high-temperature section adopting carbon steel and a low-temperature section adopting ND steel, tube bundles are staggered, media inside and outside tubes are in a counter-flow type, the tube wall temperature of the high-temperature section and the low-temperature section is adjusted precisely in a graded water supply manner, so that the tube wall temperature is higher than the acid dew point temperature of flue gas throughout, and a low-temperature corrosion relieving effect is realized. The technical problems of low heat transfer temperature pressure and serious low-temperature acid-dew-point corrosion in low-temperature flue gas waste heat recovery of the coal-fired boiler are solved very well, by means of combination of section-separated heat transfer enhancement and flexible adjustment of the tube wall temperature through graded water supply, the heat exchange performance and the anti-corrosion effect of the low-temperature heat exchanger are improved obviously, the efficiency and the economical efficiency of the low-temperature flue gas waste heat recovery of the coal-fired boiler are improved substantially, and the heat exchanger has good social and economic benefit and great industrial application and popularization potential.

The invention discloses an improved H finned tube used for waste heat recycling. The finned tube comprises a base tube and fin sets; the base tube has a certain length, multiple parallel fin sets arearranged in the axial direction of the base tube and are connected to the outer wall of the base tube, the windward sides of the fin surfaces are provided with flow disturbance rods, spherical protrusion structures are arranged at the positions, on the side of the base tube, of the center positions of the fin surfaces, and a small wing vortex generator is arranged on the leeward sides of the fin surfaces. When smoke flows past, the direction is not changed, the fins with spherical protrusions and the flow disturbance rods can change the airflow motion states, disturbance is intensified, the hysteresis heat layer thickness can be reduced, and the aim of reinforcing heat transfer is achieved to a certain degree.

The invention discloses a skin-imitated efficient swinging fluff heat dissipation coating, and belongs to the technical field of coatings. The coating can realize innovative concentration of heat absorbed by a coating body from a system through heat collection balls, then conduct the heat to the outside through a double-effect heat dissipation composite rod, and extrude air supply base balls by utilizing the characteristic that a thermal expansion wrapping sleeve is heated to expand, so that the heat dissipation effect of the coating is improved. Gas in a gas supply base ball is extruded intoa double-effect heat dissipation composite rod, a traction mid-span airbag rod is inflated and expanded, hardening of the traction mid-span airbag rod is promoted to drive the whole double-effect heatdissipation composite rod to stand up, the traction mid-span airbag rod is forced to slowly leak gas to the outside based on the magnetic attraction effect, and on one hand, the traction mid-span airbag rod is promoted to be softened and fall down again. According to the double-effect heat dissipation composite rod, the swing action can be achieved, the dust accumulation phenomenon can be improved, air flowing near the coating body can be accelerated, heat on the double-effect heat dissipation composite rod is taken away from the interior through the air leakage process, and the heat dissipation effect of the coating body is remarkably improved.

The invention discloses a production method for improving productivity of an alkaline furnace. The method comprises the following steps: (1) evaporating and concentrating of black liquor, wherein coniferous wood dissolving pulp black liquor is evaporated and concentrated by using I effect, II effect, III effect, IV effect, V effect, VI effect and super-concentration effect, so that the concentration of the treated black liquor is over 72%; (2) air volume and air pressure proportioning, wherein the primary air volume is 40000 Nm<3>/h, the primary air pressure is 1000 pa, the secondary air volume is 45000 Nm<3>/h, the secondary air pressure is 1200 pa, the tertiary air volume is 32000 Nm<3>/h, and the tertiary air pressure is 1800 pa; and (3) jet combustion, wherein black liquor jet combustion is performed by setting the aperture of a black liquor spray gun at 20 mm and setting the jet pressure at 0.08 Mpa. According to the invention, the problem of insufficient productivity of an alkalirecovery system is solved, and through adjustment of the production process, the black liquor treatment capacity is effectively improved, and the alkali yield and the steam yield are increased.

The invention belongs to the technical field of computer input equipment and discloses a keyboard convenient to clean and capable of intelligently adjusting pressing force. The keyboard comprises a shell; the bottom of the shell is fixedly connected with a keyboard wire; the right end of the bottom of the shell is elastically connected with a support through a return spring; the left end of the support is rotatably connected with a pulley; a screw rod is rotatably connected to the bottom of the shell; a clamping block is movably connected to the outer portion of the screw rod; a first spring is elastically connected to the end, away from the keyboard wire, of the clamping block; and a rotary disc is rotatably connected to the left end of the shell. According to the keyboard convenient to clean and capable of intelligently adjusting the pressing force, the key pressure is adjusted according to the requirements of a user, the user experience is enhanced, the extending length of the keyboard wire is adjusted according to the actual use environment, the length of the keyboard wire is conveniently adjusted, the keyboard wire is prevented from being excessively long and intertwined, andaccumulated dust in grooves in the bottom of the keyboard is conveniently cleaned; time waste caused by dismounting all the keys is avoided.

The invention relates to an ironing worktable, in particular to an ironing worktable for an electric iron and aims to provide an ironing worktable capable of fixing clothes, facilitating placement of an electric iron and used for the for electric iron. For solving the technical problem, the ironing worktable for the electric iron comprises a worktable body and the like. A fixing mechanism is symmetrically arranged on the worktable body, and a placement mechanism is connected to the right side of the worktable body. The fixing mechanism is arranged on the worktable body and can fix clothes, a worker can conveniently iron the clothes, and the ironing worktable is provided with the placement mechanism so that the electric iron can be placed well.