44results about How to "Reduce the amount of replacement" patented technology

The present invention provides a fuel cell system and a control method thereof that performs a scavenging process when the fuel cell is stopped, whereby stable electrical power production is ensured after startup, and faster startup is possible. The fuel cell system performs the scavenging process in which scavenging gas is supplied into an anode gas system when the fuel cell is stopped. When a startup request for the fuel cell is detected while the anode scavenging process is being performed, the concentration of hydrogen in the anode gas is detected, and then whether to continue the anode scavenging process and prohibit the fuel cell from starting, or to suspend the anode scavenging process and allow the fuel cell to start is determined based on this detected concentration of hydrogen in the anode gas system.

A scissors lift comprises an upper frame module (1) and a lower frame module (2), a scissor mechanism (3) and a drive unit (4). The upper frame module (1) and the lower frame module (2) are connected by the scissor mechanism (3) in such a way that a lifting movement, by which the spacing between the upper frame module (1) and lower frame module (2) changes, is rendered possible. The scissors lift, particularly the upper frame module (1) and/or the lower frame module (2), have a central portion (5) to which extension 6 and/or 7 that are pre-produced in fixed sizes and are fitted together in the manner of a modular construction system to make a scissors lifting lift of desired size.

The invention discloses wheels of loop wheel machine of sintering machine that can increase the service life of bearings, comprising wheel body, bearing, axles of loop wheel machine, bearing holder is set at the end of axle of loop wheel machine, the wheel body holder is installed on the bearings, and lubricating mouth is also set on the said bearings, and axles of loop wheel machine are equipped with grease channel, one end of the channel has a grease nipple, the other end connects the lubricating mouth.

This invention relates to a cooling technology of motors providing a forcing circulation evaporation cooling device of a hydrogenrerator stator winding connection pipes connect the stator winding, a condenser, a pressure circulation pump and electro-hydraulic separation joints to an evcaporation cooling loop filled with evaporation cooling medium and a pressure circulation pump forcing the circulation of the evaporation cooling medium is also in the loop, every line-rod set consisting hollow heads and solid leads in the stator winding contains odd N serial line-rods, two leading out ends of the line rod set are connected with the up and down insulation lead pipes by the electro-hydaulic separation joints, several line-rod sets and a condenser constitute an independent evaporation cooling loop.

A method of recovering carbon dioxide, including bringing gas to be processed containing carbon dioxide (CO₂) and oxygen into contact with the CO₂-absorbing solution according to Claim 1 in an absorption column to form a CO₂-rich solution; subsequently circulating the solution in a regeneration column to thermally release and recover CO₂ and recirculating the absorbing solution as a CO₂-poor solution inside the absorption column; and performing heat exchange between the solution being delivered from the absorption column to the regeneration column and the solution recirculated from the regeneration column to the absorption column, wherein an alkanolamine aqueous solution containing a silicone oil and/or an organosulfur compound represented by the Formula (A) or (B) is added to the solution inside the absorption column and/or the solution recirculated from the regeneration column to the absorption column to adjust the composition of the absorbing solution inside the absorption column so as to include the alkanolamine in an amount of 30% by weight or more and 60% by weight or less, the organosulfur compound in an amount of 0.01% by weight or more and 2% by weight or less, and the silicone oil in an amount of 5 ppm by weight or more and 100 ppm by weight or less.

A boiler water level control method and its control system, based on the principle of three-impulse cascade control, controls the valve position of the feed water regulating valve; the control system can also compare the upper and lower limit values ​​of the water level from the steam drum with the water level tracking value respectively The signal directly controls the full closing and full opening of the water supply regulating valve. The boiler water level control system working in the above method is composed of three-impulse transmitters for steam drum water level, steam flow rate and feed water flow rate, controller, upper computer, hand operator and electric water feed regulating valve. , The selection module and the comparison module are used to calculate the upper limit value and the lower limit value of the water level, set the limit valve position, and judge the state of the water level exceeding the limit. The system responds quickly and has a high level of automation, reducing labor intensity and ensuring safe operation of the boiler.

The invention relates to the field of textile accessories and especially to a wear resistant palm fiber for a matched circular weaving machine. The wear resistant palm fiber comprises a palm fiber fixing hook, a drawing metal line and a fiber threading hole, wherein, a wear resistant loop is clamped in the fiber threading hole, an outer ring of the wear resistant loop is provided with a groove matched with an inner ring of the wear resistant loop, and the wear resistant loop is made of a manganese steel alloy material. According to the invention, the wear resistant loop is clamped in the fiber threading hole, which enables wear resistance of the fiber threading hole to be substantially improved and the service life of the palm fiber to be prolonged; and the wear resistant palm fiber has an improved structure, so when the palm fiber is worn, it only needs to replace the wear resistant loop without replacing the whole palm fiber, thereby lowering down production cost and improving economic benefits.

A pressure-variable adsorption process with auxiliary system features use of a primary adsorption-regeneration cyclic system composed of two or more adsorption towers and an additional adsorption-regeneration cyclic system also composed of two or more adsorption towers. The charge gas is input to the said primary system which outputs the components difficult to be adsorbed. When the content of the components easily adsorbed in the primary system is going to go beyond the standard value, its output is switched to the said additional system. It can simulatenious obtain high-purity easily adsorbed components and difficultly adsorbed components with high output rate and low cost.

The invention provides a casting ladle and a device for preparing nodular cast iron. The casting ladle comprises a shell, a first fire-retarding portion and a second fire-retarding portion. The shellcomprises a ladle body and a ladle nozzle. The first fire-retarding portion is attached to the inner surface of the ladle body. The second fire-retarding portion is attached to the inner surface of the ladle nozzle. With the casting ladle and the device for preparing nodular cast iron, the problem that a fire-retarding portion of a ladle nozzle of an existing casting ladle is corroded badly, and the cost of replacement is high. Because the first fire-retarding portion is attached to the inner surface of the ladle body, and the second fire-retarding portion is attached to the inner surface of the ladle nozzle, the ladle body and the fire-retarding portion of the ladle nozzle are cast independently, the ladle nozzle can be replaced independently, operation is more convenient and quick, the production efficiency is improved, and the economic benefit is good.

The invention provides a carbon-free steel ladle composite ladle bottom constructing technology. The technology is applied to guarantee that the ladle bottom repairing difficulty and the repairing cost are reduced while a ladle bottom is safely used. The carbon-free steel ladle composite ladle bottom constructing technology comprises the following steps that a ladle bottom is cleaned, pouring of perpetual lining casting materials is carried out, maintaining is carried out, pouring of ladle bottom working layer casting materials is carried out, maintaining is carried out, ladle bottom working bricks are constructed, and baking is carried out; and the technology is used for constructing the ladle bottom, the first-layer perpetual lining casting materials can achieve the aims of guaranteeingthe ladle bottom safety and the thermal insulation and heat preservation effect, the second-layer ladle bottom working layer casting materials guarantee the using safety of the repaired ladle bottom,and the third-layer carbon-free prefabricated bricks can be locally replaced and mended by replacing damaged parts. The steel ladle bottom using safety, the ladle bottom repairing difficulty and ladlebottom repairing cost have contradiction all the times, the three-layer refractory material structures of the composite ladle bottom well solve the problems.

The invention discloses an acetylene tail gas recovery device for BDO production, and solves the problems of large methanol replacement amount and incapability of long-period stable operation in the existing BDO production technology. Acetylene tail gas from an ethynylation reaction system is washed by a washing tower, then enters a tail gas compressor, is pressurized, passes through a liquid removal system, enters an absorption tower after water and other small liquid drops are removed, tail gas subjected to low-temperature methanol absorption is fed into an acetylene torch, rich liquid enters a regeneration tower to be regenerated, and tower bottom regeneration liquid returns to the absorption tower to be recycled. Recycled acetylene is obtained from the tower top. The method is simple in process, convenient to operate, low in methanol replacement amount, good in device operation stability and high in competitiveness.

The invention discloses a construction process of a composite ladle bottom of a steel ladle. The construction process comprises the following specific construction process flows of cleaning the ladlebottom of the steel ladle; pouring a permanent lining castable; carrying out primary curing; building a working layer brick of the ladle bottom; pouring a working layer castable of the ladle bottom; and carrying out secondary curing and baking. According to construction process of the composite ladle bottom of the steel ladle, the ladle bottom is divided into three layers, namely the first layer of the ladle bottom permanent lining, the second layer of a working layer aluminum-magnesium-carbon brick layer and the third layer of a ladle bottom castable layer, wherein the first layer of the permanent lining castable can ensure the safety of the ladle bottom and heat insulation, the second layer of the ladle bottom working layer brick ensures the safe use of the repaired ladle bottom, and thethird layer of the ladle bottom castable protects the ladle bottom working brick.

The invention relates to a VOCs waste gas treatment device which comprises a waste gas collecting device, a waste gas treatment device, a condensing device, a safety device, an induced draft fan, an oil gas collecting device, a gas discharging device, a connecting pipe fitting of the gas discharging device and an electric control system device. The waste gas collecting device is connected with the waste gas treatment device, and the waste gas treatment device is composed of a hollow outer cylinder structure framework, an organic membrane micro-filtration pipe and a filter pipe inner baffle plate; the waste gas treatment device is connected with the condensing device through a first induced draft fan and is connected with the safety device through a second induced draft fan; the organic membrane micro-filtration pipe and the filter pipe inner baffle plate are arranged in the hollow outer cylinder structure framework in parallel, and the filter pipe inner baffle plate is perpendicular to the pipe wall of the organic membrane micro-filtration pipe to form crossed and alternate fan-shaped channels in the organic membrane micro-filtration pipe. By arranging the baffling concave-convex plate structure with the large specific surface area, organic components in the VOCs waste gas can be rapidly adsorbed, and are fully adsorbed and filtered by the organic membrane on the filter pipe, so that the purpose of effectively removing VOCs is achieved.

The invention relates to the technical field of composite materials, in particular to an environment-friendly composite material which comprises silicon dioxide aerogel, aramid fibers, glass fibers, tetraethoxysilane, silicon carbide, diepoxypropane ethyl ether, vinyl resin, an initiator, an accelerant and a reinforcing agent. The preparation method comprises the following specific steps: adding silicon dioxide aerogel, aramid fiber and glass fiber into an emulsifying machine, filtering, evaporating excessive water, adding tetraethoxysilane, silicon carbide and diepoxypropane ethyl ether into a crusher, crushing, cleaning, mixing with vinyl resin for later use, and performing extrusion molding to obtain the composite material. And finally, mixing the mixture in each stage, filtering, drying, dehydrating, and extruding to form. Through comparison of a finished product experiment result and an existing finished product experiment result, the finished product is more durable than the existing finished product and is more difficult to damage, so that the replacement amount is reduced, the cost of a user is reduced, and the device is more environment-friendly.

The invention discloses a parabolic long-life continuous casting submersed nozzle which comprises a nozzle body, the top of the nozzle body is a bowl opening portion, the lower portion of the nozzle body is provided with a slag line portion, and the nozzle body between the bowl opening portion and the slag line portion is composed of a cylindrical body on the upper portion and a parabolic body on the lower portion. 48-52% by mass of Al203 is contained in the cylinder body and the parabola-shaped body, wear-resistant coatings are arranged on the inner circumferential walls of the cylinder body and the parabola-shaped body respectively, the wear-resistant coatings are composed of 28-32% by mass of C + SiC mixture, 45-50% by mass of magnesium oxide is contained in the bowl opening part, a wear-resistant coating is arranged on the inner circumferential wall of the bowl opening part, and the wear-resistant coatings are composed of 20-30% by mass of magnesium oxide. A wear-resistant coating is arranged on the inner circumferential wall of the slag line part, the wear-resistant coating is composed of 15-20% by mass of a C + SiC mixture, 80-82% by mass of ZrO2 is contained in the slag line part, the wear-resistant coating is arranged on the inner circumferential wall of the slag line part, and the wear-resistant coating is composed of 18-22% by mass of a C + SiC mixture.