31results about How to "Increase temperature drop" patented technology

The invention relates to an IF steel rolling method, in particular to a method for rolling interstitial free steel ferrite on traditional hot rolling mills, which mainly solves the technical problem that finish rolling of the traditional IF steel austenite-region rolling is easy to fall into a two-phase region. The method for rolling interstitial free steel ferrite on traditional hot rolling mills comprises the steps of heating a slab through a heating furnace, performing rough rolling in a rough rolling mill, performing finish rolling in a finish rolling mill, performing laminar cooling and coiling. The method is characterized in that rough rolling is performed in an austenite region; the slab is cooled to the temperature at which an austenite structure is basically changed into a ferrite structure after rough rolling is over; finish rolling is performed in a ferrite region; the heating temperature of the slab is 1,130 + / - 20 DEG C; the inlet temperature of finish rolling is 850 + / - 20 DEG C; the final rolling temperature is 820 + / - 20 DEG C; the coiling temperature is 710 + / - 20 DEG C; and the thickness of an intermediate slab is 36 to 40 mm. The method mainly performs IF steel rolling on the traditional hot rolling mills.

The invention provides a hot continuous rolling mill finish rolling inlet variable speed control method which is especially suitable for metal rolling mills or control devices for machining products, and particularly relates to a method for controlling entrance speed of finish rolling strip steel of a hot continuous rolling mill through computer programs. According to four sets of compensation factors, feature parameters of the entering strip steel are determined; according to the feature parameters of the strip steel, speed reducing point correction of the strip steel is determined; according to the speed reducing point correction, a target speed reducing point of the strip steel is determined, and a dynamic speed reducing point is controlled; according to the target speed reducing point of the strip steel, a tracking start point of the head of the strip steel is determined; according to the feature parameters of the strip steel, the shear front-arranging rate of a flying shear is determined; according to the entrance speed of the strip steel and the shear front-arranging rate of the flying shear, the shearing speed of the flying shear is determined. Speed change points are determined according to the types and specifications of steel, the speed of the strip steel before flying shear is controlled in a multilevel mode, conveying time of the strip steel in an intermediate roller way is saved, the rolling efficiency of different strip steel can be maximized, and the rolling efficiency of the strip steel in the hot rolling process is improved.

Downspray spray push draft cooling towers and jet coolers. The tower body is equipped with an external rotating spray propulsion and exhaust device that injects hot water under pressure and sprays mist flow. The nozzle sprays downward and the blades draw air downward; The middle and lower part of the tower wall is equipped with wind buckets. There is a multi-layer water spray screen under the spray device, which distributes water and guides the wind to make the water spray evenly, and the cold air passes through the water mist flow for multiple times to fully exchange heat, which greatly improves the heat transfer efficiency. Because the wind and water are in the same direction, the interference of water mist on the wind blades is reduced, the force of the jet flow is increased, and the downward direction of the spray flow ejection wind can also be used, that is, the three airflows of the wind blade mechanical wind, the spray ejection wind and the fan ejection wind are generated. Heat exchange with the spray flow, the air volume is increased, the air-water ratio is above 1.0, which is 29-90% higher than the existing spray cooling tower, and the temperature drop can be greatly improved. The noise of the water flow in the tower is reduced; the top of the tower does not float; the working water pressure drop is 0.08-0.12MPa. Because the outlet air temperature is similar to the outlet water temperature, it can be used as a jet cooler at the same time for cooling and air conditioning in spring, summer and autumn.

The invention discloses an evaporative water chilling unit comprising parallel air coolers, an air filter and a water filter, wherein a primary direct evaporative cooler and a secondary direct evaporative cooler which are connected in parallel are arranged in a shell of the unit, and a primary air cooler and a secondary air cooler which are connected in parallel are also arranged in the shell of the unit; an air filtering and dust removing device is arranged at one side of the primary direct evaporative cooler; an exhaust fan is arranged at one side of the secondary direct evaporative cooler;and a water collecting box and the water filter are respectively arranged at the lower parts of the two direct evaporative coolers. The water chilling unit of the invention adopts the mode of arranging the primary air cooler and the secondary air cooler in parallel and arranging the primary direct evaporative cooler and the secondary direct evaporative cooler in parallel, and simultaneously, the active air filter and the active water filter are arranged for two-stage filtration; the evaporative cooling technology is fully utilized to prepare high-temperature cold water of which the temperature is between wet-bulb temperature and dew-point temperature; and compared with the traditional water chilling unit refrigerated mechanically, the evaporative water chilling unit of the invention is more economic, energy-saving and environment-friendly and has higher coefficient of performance (cop).

The invention discloses a method for controlling a multi-stage air deflector of an air conditioner. The method for controlling a multi-stage air deflector of an air conditioner includes the following steps: when the air conditioner starts to operate, obtain the air supply volume of a target area; compare The size relationship between the air supply volume of the target area and the preset air supply volume; according to the size relationship, the wind guide angle of the multi-section air deflector is correspondingly adjusted. The invention also discloses an air conditioner and a computer-readable storage medium. The present invention uses multi-section air deflectors to flexibly adjust the air guide angles of one or more sections of air deflectors according to different requirements, so as to realize the adjustment of air supply volume and further increase the speed of temperature drop or temperature rise.

A novel air conditioner dehumidification unit adopts the structure that a compressor, a separating tank and a liquid storage tank are respectively connected with three ports of a reversing valve, and the other three ports of the reversing valve are respectively connected with two ports of first plate fin type heat exchangers and one end of a dew point indirect evaporative cooling device; and the other end of the dew point indirect evaporative cooling device is communicated with the liquid storage tank; the separating tank is communicated with the compressor; the first plate fin type heat exchangers are arranged on the function sections of a combined type air-handling unit; a second throttle valve is arranged on a connecting pipeline of the liquid storage tank and the reversing valve; a first throttle valve is arranged on the connecting pipeline of the dew point indirect evaporative cooling device and the liquid storage tank; in a refrigeration working condition, the second throttle valve works, and in the heating working condition, the first throttle valve works; and in field where dehumidification is required, second plate fin type heat exchangers are additionally arranged on the function sections of the combined type air-handling unit. According to the unit provided by the invention, the cold / hot water circulating system is saved, three working conditions of refrigeration, heating and dehumidification are realized, the heat exchange efficiency is high, and the remarkable effects of energy conservation and emission reduction can be achieved.

The invention discloses a blade hole type prewhirl nozzle for a prewhirl cooling system, and belongs to the field of application of aero-engine prewhirl cooling systems. The blade hole type prewhirl nozzle is characterized in that a blade pressure face and a blade suction face are adopted for forming inclined hole runners deflecting in the circumferential direction of a nozzle ring at equal intervals, deflecting molded faces of the nozzle runners are in a gradually-contracted shape, a minimum laryngeal area is achieved at an outlet of the prewhirl nozzle, the accelerating performance and the deflecting performance of the prewhirl nozzle are effectively guaranteed, and the flowing loss of a main flow is small. Blade type solid blocks are distributed between adjacent runners of the prewhirl nozzle, under the condition that the laryngeal area of the nozzle is definite, the ratio of the blade height to the pitch of the prewhirl nozzle can be flexibly adjusted by additionally arranging the blade type solid blocks, and the long and narrow performance of the sections of the runners is effectively improved, so that the secondary flow loss of the end walls in the runners is reduced, the flow coefficient and the prewhirl efficiency of the prewhirl nozzle are improved, and the system temperature drop effect is further improved.

The invention provides a production method for ultralow-phosphorus hydroforming steel and relates to the technical field of metal material smelting. The production method sequentially comprises the steps of molten iron pretreatment, LD converter smelting, primary LF refining, slagging-off treatment, secondary LF refining, VD vacuum treatment and continuous casting. Specifically, molten iron pretreatment is carried out through a KR method; in the LD converter smelting link, peroxidation is adopted to steel tapping, the final phosphorus content is strictly controlled; in the primary LF refininglink, a slagging material is added, primary refining dephosphorization is carried out, so that the phosphorus content of molten steel reaches to 0.002%-0.003%; after the phosphorus content is qualified, slagging off is carried out; in the secondary LF refining, component adjustment is mainly carried out, and the purity degree is improved; and in VD vacuum treatment, degassing is carried out, and acasting blank is obtained through continuous casting. The HIC and SSCC performance of the ultralow-phosphorus hydroforming steel obtained through the production method can meet requirements of the related standard completely, and the chemical components of a steel plate are stable; the content of harmful chemical components of phosphorus and sulfur is low; nonmetallic inclusion is controlled well; and the quality of the casting blank is good.

The invention belongs to the field of billet continuous casting production, and particularly relates to a gradual cambered chamfered mold with an enhanced water cooling structure and a design method. The mold is provided with four upper opening chamfers and four lower opening chamfers, wherein the chamfer angle is gradually increased according to the thermal contraction rule at the corner of a casting blank from the upper opening chamfers to the lower opening chamfers along the height direction of the inner wall of the mold; the chamfer surfaces formed between the upper opening chamfers and the lower opening chamfers are gradual cambered surfaces; the transition arc length at the boundary of the gradual cambered surfaces increases according to the air gap growth rule; the beveled edges of the upper opening chamfers on the chamber surfaces are straight or cambered; the beveled edges of the lower opening chamfers on the chamber surfaces are also straight or cambered. According to the mold, the air gap is effectively suppressed through a specific cambered chamfer structure, the heat transfer of the corner of the billet is improved, the shell growth is homogenized, the cooling of the corner of the mold is obviously improved by enhancing the water cooling structure of the chamfer region, the grains of the chamfer contact surface are thinned, and the occurrence of the corner defect is surpassed.

The invention discloses an oriented particle board production system and a production method provided with a flame retardant spraying structure. The production system includes: flaking device, wet flaking conveying device, wet flaking silo, drying device, dry flaking conveying device 1, screening device, dry flaking silo, dry flaking conveying device 2, glue mixing device, paving device, hot pressing device and flame retardant spraying structure; the flame retardant spraying structure is connected with the flaking device, dry flaking conveying device 1 and / or dry flaking conveying device 2, glue mixing device, The paving device is connected. The present invention adopts multi-process spraying, the shavings absorb fully, and the flame retardant is evenly distributed. By spraying various flame retardant solutions while shaving, it can unexpectedly obtain excellent coverage of the flame retardant and further improve the flame retardant. Cooling of rings and blades. The flame-retardant oriented strand board obtained by the treatment has excellent flame-retardant performance; the physical properties are equivalent to those of the oriented strand board produced and pressed without adding a flame retardant.

The invention discloses a three-stage evaporative cooling-variable-channel air supply system for a textile mill. The three-stage evaporative cooling-variable-channel air supply system for the textile mill is composed of a main cooler, an auxiliary cooler and a water spray chamber which are connected through an air pipe network and a water pipe network. According to the three-stage evaporative cooling-variable-channel air supply system for the textile mill, which is disclosed by the invention, a three-stage evaporative cooling system is adopted with regard to the special environment, that is, each high-heat workshop of the textile mill, cold is provided for each workshop by virtue of a renewable energy, that is, 'dry air energy', and the way is energy-saving and environment-friendly; pre-cooling secondary air is provided for the main cooler by virtue of the auxiliary cooler, and a remarkable effect during cooling of the secondary air for primary air after a wet bulb temperature is lowered is achieved; a ventilation pipeline can be flexibly changed with regard to different weathers outside each workshop of the textile mill, and the mixed air of all fresh air, all return air and fresh return air can be adopted as the secondary air; and in addition, the main cooler and the auxiliary cooler can be connected in parallel with regard to a period with a high production capacity, of the textile mill, thus an air treatment quantity is increased, and the temperature and humidity of each workshop of the textile mill are ensured.