57results about How to "Large adjustment ratio" patented technology

A pressure regulator that has particular application for an anode input side of a fuel cell system to provide the desired large turn-down ratio. The pressure regulator includes at least two valves positioned in parallel where the first valve is smaller than the second valve. The first valve is opened and closed and the second valve is maintained closed at low flow rates. Once the flow rate is high enough, the first valve is maintained completely open, and the second valve is opened and closed to control the flow at high flow rates.

In devices known in the art, “conventional firetube” and “waste heat recovery” boilers each require many small tubes making successive passes within the boiler. In one embodiment of the invention, however, an enhanced conduit replaces numerous conventional small tubes. In some embodiments, the enhanced conduit incorporates a plurality of fins, each of which extends through a wall of the conduit. In other embodiments, the enhanced conduit incorporates a plurality of tubes along its outer surface, through which a heat transfer medium flows. Both designs enhance the heat transfer relationship between the hot fluid and the heat transfer medium by providing a continuous heat transfer relationship with the heat transfer medium, increasing the surface area involved in the heat transfer relationship and enhancing convection/conduction couples. For some applications, all of the tube banks of other devices in the art can be replaced by one continuous enhanced conduit.

The invention discloses a biogas burner which comprises a combustor drum outer pipe, a combustor drum inner pipe, a conical flame stabilizing disc, an outer air pipe, an air-outlet hole, an air spinning sheet, a gas spinning sheet, a decoking conical port, an air-inlet device, an air-inlet outer pipe and an adjusting bolt. The air-inlet outer pipe is welded on a conical port connector, a detachable flange is further fixed on the air-inlet outer pipe, the air-inlet device and the decoking conical port are fixed on the detachable flange, a conical port adapting flange is fixedly connected onto the conical port connector, the adjusting bolt is locked on the outer air pipe and butts against the air inlet outer pipe, the combustor drum inner pipe is sleeved on the combustor drum outer pipe, a support plate is further arranged on the combustor drum inner pipe, and the conical flame-stabilizing disc is fixedly connected onto the combustor drum inner pipe. The biogas burner enables fuel to be sufficiently combusted, cannot pollute environment, is not prone to be blocked, and is free of tempering blowing-off, long in service life and good in stability.

A regulating valve used for accurately positioning a valve plug and regulating pressure or flow rate of fluid in a fluid transportation pipeline is especially suitable for power station, petroleum and chemical department, belonging to the field of engineering elements or parts. The regulating valve comprises three parts which are a valve body, a driving cylinder and a servo mechanism, and the valve body having the conventional structure of a stop valve is combined with the driving cylinder that is internally provided with a piston into a whole; a channel used for drawing in the controlled fluid is also processed; the servo mechanism mainly includes a servo pipe and a screw gearing pair (or a pinion and rack gearing pair). The gap between the end surface of the servo pipe and the end surface of an axial aerial drainage hole in the center of the piston is regulated to change the differential pressure of the controlled fluid at the two sides of the piston, and the valve plug linked with the piston is further moved and is accurately balanced at the requested position. The regulating valve has the advantages that the mobile servo pipe has low power consumption (watt level), high positioning accuracy, large turndown ratio, high sensitivity, good stability and easy combination with a fluid control system having high intelligence.

A cooling mechanism for a casting apparatus having a mold that includes sides, a bottom, and a top defining a cavity. The cooling mechanism allows for simultaneous injection of liquid and gas onto a cast ingot therefore providing a lower minimum operation liquid flow rate, while maintaining a fairly constant coolant impingement location on the ingot surface. As a result, heat is extracted from the metal ingot at a much lower rate allowing the ingot to experience superior startup butt curl control, which substantially reduces the number of localized stresses that can lead to cracking of the ingot. Reducing the number of cracks in the ingot substantially reduces the number of wasted ingots, therefore improving efficiency and reducing costs. A method of casting is also disclosed.

A continuously variable fluent control valve for controlling supersonic flow of gas. The valve has an upper plate with a very slightly angled physical control surface and a lower plate with a physical nozzle inlet. As the valve opens and closes during supersonic flow, a hydrodynamic pintle forms in the nozzle inlet just below the physical control surface. The hydrodynamic pintle provides a fluid control surface for redirecting flow from horizontal fllow to vertical flow through the nozzle and, depending on the expansion needs of the supersonic flow, the hydrodynamic pintle changes shape, expanding or shrinking in the axial direction of the valve. Because of the nearly flat physical control surface of the upper plate, matieral ablation is significantly reduced. The fluid-fluid boundary between the hydrodynamic pintle and the supersonic flow produces a flow through the nozzle with little or no recirculation.

The embodiment of the invention discloses a fully-premixed metal net combustor. A spiral flow type mixer is arranged on the upstream of a gas mixing and distributing device and arranged in a premixing cavity, the gas mixing and distributing device is arranged in a supporting element below the combustion surface, due to the fact that the spiral flow type mixer has the better gas and air mixing effect, the gas mixing and distributing device has the better uniform gas distributing effect, combustion is complete, and pollutants can be reduced. A high-temperature-resistant metal net serves as the combustion surface, the porosity of the metal net is large, air resistance is small, the mesh net is not likely to be blocked by tiny dust in air, and therefore the efficiency of a draught fan is high. Due to the adoption of the gas mixing and distributing device, the length-diameter ratio of the premixed combustor can be large, the premixed combustor with the high power can be manufactured, service life is long, and cost is low.

The invention provides high-efficiency heat transfer devices and apparatuses In one embodiment, the invention includes a vessel capable of containing the heat transfer medium, a conduit extending through a wall of the vessel, the conduit having a first surface for contacting the heat transfer medium and a second surface for contacting a fluid within the conduit, a helical member residing around and along a length of the first surface of the conduit capable of angularly directing a flow of the heat transfer medium along the first surface of the conduit; and a plurality of fins helically arranged adjacent the helical member, each fin extending through a wall of the conduit and being capable of directing at least a portion of the heat transfer medium to an area within a radius of the conduit.

A dry-method fume-desulfurizing system with parallel more towers features that its desulfurizing reaction tower is composed of 2 or more desulfurizing reaction subtowers, whose fume mixing chambers at their bottom are parallelly connected to form a large desulfurizing reaction system with wide regulation range. Said fume mixing chamber has the guide plate for uniformly distributing the fume to the fume jet accelerator in each substower. There is a composite fume jet in the middle of said subtower to form a strong turbulent mixing region.

The invention relates to the field of environmental protection technology and particularly relates to a novel energy-saving and environment-friendly combustion engine, which comprises a muffler, a primary air port, a secondary air port, a nozzle, an igniter, an injector, a sprayer, a plum blossom-type flue brick, a nameplate, a motor, a combustion cylinder, an air pressure switch, a control box and an ignition transformer. The injector and the sprayer are directly connected to form an integral structure. The nozzle and the motor are directly connected and are positioned right in front of the muffler. The nameplate is arranged on the left upper part of an instrument. The igniter is arranged in front of the muffler. The combustion cylinder is directly connected with the ignition transformer and is right above the sprayer. According to the technical scheme of the invention, through reasonably organizing the combustion process, the above combustion engine is more energy-saving, more environment-friendly, higher in combustion efficiency, stable in combustion, good in flame performance, strong in radiation capability, high in heat recovery capability, small in noise, less in amount of noxious gas and smoke, convenient to use, simple in design, low in cost and worth to popularize and use widely during the working process.

The invention relates to an adjustable swirl blade assembly and a flat flame burner comprising the same, and belongs to the technical field of combustion equipment. The adjustable swirl blade assembly comprises an adjustable swirl blade assembly body and a blade transmission device, and the body comprises a central rectification body, an outer cylinder, an inner cylinder and a plurality of rotatable blades which are coaxially arranged; the blade transmission device comprises a plurality of blade rotating shafts which are fixedly connected with the blades and are used for controlling the blades to rotate, transmission connecting rods which are fixedly connected with one ends of the blade rotating shafts in a one-to-one correspondence manner, a total connecting ring which is connected with the transmission connecting rods and surrounds the adjustable swirl blade assembly body, and an operating rod which is connected with the total connecting ring and is used for controlling the total connecting ring to move; and each transmission connecting rod is formed by rotationally connecting three rigid connecting rods, and two rotating pairs with non-coaxial lines and non-parallel rotating shafts are formed at the joint. The technical problem that in a traditional device, control over blades is not accurate is solved, a combustor can operate under the small-load working condition, the large air-fuel ratio working condition and the condition that the fuel heat value fluctuates violently, and stable flat flames are formed.

A heat processing furnace which adopts a porous medium burner belongs to the technical field of heat processing furnace. The furnace includes a hearth body and burners. The burners adopt porous ceramics foam; the burners are arranged on the top part or the side wall of the furnace; the surrounding masonrys of the outlet sections of the burners are designed to be of a gradually expanded horn shape; the crossing line of the extending surface of the outlet sections of two neighboring burners or the crossing line between the extending surface of the outlet sections of the burners and the wall of the furnace wall is arranged above a workpiece to be heated; the heat loss of the wall of the furnace arranged in the mode is less; the radiation heat transmission share is large. The ceramics materials of the burners are cordierite, yttrium oxide-based zirconia, calcium oxide-based zirconia, silicon nitride, aluminum oxide or the ceramics particles bonded by a bonding agent. The burner is formed by one or a plurality of same burning units. The porous medium burner of the invention has the advantages of small size, low manufacture cost, low mounting difficulty, large adjusting ratio, high burning intensity and low contamination discharge. The heat processing furnace has the advantages of high burning efficiency, less heat loss and high heating quality.

The invention provides a forced recirculation water pipe steam boiler system and an operating method thereof. A floater water carrier is arranged in a water tank, the floater water carrier is connected to a condenser through a boiler water supply pipeline, a boiler feed pump is connected in series to the boiler water supply pipeline, the condenser is connected to a buffer liquid control tank through a water feeding pipeline, the buffer liquid control tank is connected to a water inlet of a boiler body through a high-temperature water supply pipeline, a high-temperature circulation pump is connected in series on the high-temperature water supply pipeline, the water inlet of the boiler body communicates to a burner plate and a square coil pipe of a hearth, the square coil pipe of the hearthis connected to a tail gathering header, the tail gathering header is connected to a fin type downcomer economizer, the fin type downcomer economizer is connected to a bottom converging header, the bottom converging header is connected to a boiling ascension pipe of the hearth, the boiling ascension pipe of the hearth is connected to a top gathering header, a steam-water mixing outlet of the top gathering header is connected to a steam-water separator through a steam-water mixing pipeline, and a liquid outlet of the steam-water separator is connected to the buffer liquid control tank through areflow pipeline.

The invention discloses a flat flame burner. The flat flame burner comprises an air inlet pipe 1, an gas inlet pipe 3, a swirler 2, a burner shell 7, burner bricks 8, a variable cross section device 5and a variable cross section control rod 6, wherein the burner blocks 8 form a combustion channel 16 with a gradually-wide structure and communicates with the burner shell 7, the air inlet pipe 1 isvertically arranged on the burner shell 7, the gas inlet pipe 3 is a variable-cross-section pipe and sequentially passes through the burner shell 7 and the swirler 2 and extends into the combustion channel 16, the variable cross section device 5 is arranged at the bottom of the gas inlet pipe 3, the largest cross section of the variable cross section device 5 is equal to the cross section of the bottom of the gas inlet pipe 3, the gas inlet pipe 3 is arranged axial with the burner shell 7, the swirler 2, the variable-cross-section device 5 and the combustion channel 16, one end of the variable-section control rod 6 is connected with a blade driving ring 4 through a connecting rod, and the other end of the variable-section control rod 6 is arranged at the inlet of the gas inlet pipe 3, so that the variable-section control rod 6 is used for controlling the cross section area of the variable cross section device 5 to change the outlet of the bottom of the gas inlet pipe 3.

The invention provides a combustor for exhaust gas incineration and adjustable in adjustment ratio. The combustor for the exhaust gas incineration and adjustable in adjustment ratio comprises a bearing cover plate, a main fire gun, a taper spray head and a translation drive mechanism, wherein the translation drive mechanism can drive the main fire gun and the taper spray head to translate, therebychanging the size of an interval between the outer circumference of a big mouth end of the taper spray head and an opening of a hearth. Compared with the prior art, when the amount of process exhaustgas is obviously increased, the translation drive mechanism moves the main fire gun and the taper spray head back and enlarges the interval between the taper spray head and the hearth, a great amountof the exhaust gas can enter the hearth form the interval, differential pressure of the exhaust gas which passes through the taper spray head returns to a normal range, smooth combustion is ensured,the adjustment ratio of the combustor is increased, and the effective incineration of the exhaust gas is realized.