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

The invention relates to control devices or methods specially for metal rolling machines and manufacturing products of the metal rolling machines and discloses a cooling system for a rolled stripe continuously-casting production line and a control method of the cooling system. The system comprises a segmented laminar flow cooling device and a cooling control system which are arranged behind an online hot rolling machine, wherein the segmented laminar flow cooling device comprises at least two segmented laminar flow cooling collecting pipe areas, wherein one of the at least two segmented laminar flow cooling pipe collecting areas adopts a nozzle cooling collecting pipe with small pipe diameter, the cooling control system is an online double-closed-loop control system and comprises a double-closed-loop control circuit, the double-closed-loop control circuit comprises a feedforward control module, a precomputation module, a feedback control module, a coiling-ahead temperature measuring module and a self-adaption learning module, the double-closed-loop control circuit selects at least one collecting pipe area of the segmented laminar flow cooling device, the number of open collecting pipes in the selected collecting pipe area can be adjusted by a group of control valves, and the requirements on the accuracy of coiling temperature of steel stripes rolled at a low speed during the variation of speed and thickness in a limited cooling area can be met by the nozzle cooling collecting pipe with the small pipe diameter and the online double-closed-loop control system.

The invention provides an efficient oxygen-generation and air stagnation prevention chemical oxygen fire-fighting self-rescue respirator with a cooling layer. The chemical oxygen fire-fighting self-rescue respirator comprises a mask (1), a breathing cover (2), an oxygen-generation tank (3) and an airbag (6), and is characterized in that the breathing cover is arranged on the mask and is connected with an opening of the airbag; an expiration one-way valve and an inspiration one-way valve are arranged at the connecting position of the breathing cover and the airbag; the oxygen-generation tank is arranged in the airbag, and an air inlet in the top of the oxygen-generation tank is connected with the breathing cover through the expiration one-way valve; meanwhile an air guide tube is connected with an air outlet in the bottom of the oxygen-generation tank. According to the self-rescue respirator, the oxygen-generation tank is arranged in the airbag, the airbag is effectively prevented from being wrinkled or adhered, and the air stagnation phenomenon is completely eradicated; a flow channel subdivision staggered fin type cooling structure is adopted in the oxygen-generation tank, the problem that the reaction in a medicament layer is uneven and the cooling problem are effectively solved, and meanwhile the temperature of generated oxygen is effectively lowered through the arrangement of a supporting heat conduction separation plate, a heat isolation layer and the air guide tube.

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 technical field of rough rolling and discloses a method for improving the rough rolling rhythm of strip steel. The method includes the steps that a rolling mill double-descaling water cooling step is adopted, and the temperature of plate blanks in the rolling process is lowered, wherein by adopting the rolling mill double-descaling water cooling step, descaling water is sprayed to the plate blanks at an inlet and an outlet of a rolling mill correspondingly. The method for improving the rolling rhythm by shortening the steel placement time is efficient and stable.

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.

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 an oriented strand board production system provided with a flame retarding agent spraying structure and a production method of oriented strand boards. The production system comprises a flaking device, a wet flaking conveying device, a wet flaking stock bin, a drying device, a first dry flaking conveying device, a screening device, a dry flaking stock bin, a second dry flaking conveying device, a glue stirring device, a paving device, a hot pressing device and the flame retarding agent spraying structure; and the flame retarding agent spraying structure is connected withthe flaking device, the first dry flaking conveying device and/or the second dry flaking conveying device, the glue stirring device and the paving device. Multiple-work-procedure spraying is adoptedfor the system, flaking absorbing is sufficient, and a flame retarding agent is distributed uniformly; various types of flame retarding agent solutions are sprayed while flaking is performed, an excellent flame retarding agent covering rate can be acquired unexpectedly, and the temperature lowering amplitude of a knife ring and a blade is further improved. A flame retarding oriented strand board obtained due to treatment is good in flame retarding performance; and the physical performance of the obtained oriented strand board is equivalent to that of an oriented strand board produced and pressed without adding a flame retarding agent.

The invention discloses a control device for refining ladle slag emulsification. The control device comprises a furnace body; a wall surface of the furnace body comprises a fire-resistant layer, a furnace body permanent layer and a thermal insulation layer that are arranged from the inside to the outside sequentially; a brick cup layer is arranged at the bottom of the furnace body; the thermal insulation layer and the brick cup layer are externally provided with wrapping steel wrapping the whole furnace body; the fire-resistant layer comprises a molten steel fire-resistant layer part located at the lower part of the furnace body and a slag line fire-resistant layer part located at the upper part of the furnace body; a coil is arranged the corresponding upper parts of the thermal insulation layer and the slag line fire-resistant layer; and the two ends of the coil are connected with an anode and a cathode of a direct current power supply. The invention further discloses a control method for the refining ladle slag emulsification. The control method is characterized in that molten steel and slag are poured into furnace body, argon gas is blown in from the bottom of the furnace body for 1-3mins, then the direct current power supply is turned on, the coil is electrified, and an electromagnetic field is formed. An emulsification motion state of the slag is controlled in real time under a dynamic condition, so that the life of a liner material is prolonged effectively, the steel cleanness is improved, and a guarantee is provided for safe and efficient production of high quality steel.

The invention relates to an ultrasonic punching device for blast furnace slag. A flushing tank body is located below a slag inlet. A water tank body is provided with a water inlet pipe, and the water inlet pipe is connected with an externally-connected water pipe. The flushing tank body is connected with a punching pore plate with punching nozzles. A slag flushing ditch is formed between a left-side retaining wall and a right-side retaining wall. The slag flushing ditch is provided with an inclined section and a gentle section. A cambered surface top covering plate is arranged on the rear section of a punching device body. A waste gas collection device is arranged on the cambered surface top covering plate. Amplitude-change poles of an ultrasonic generation device are connected to the left-side retaining wall and the right-side retaining wall. A flow distribution device is mounted on the gentle section of the slag flushing ditch. Flow distribution partitions are arranged on an arc-shaped baffle of the flow distribution device. By means of the ultrasonic punching device for the blast furnace slag, the blast furnace slag enters the slag flushing ditch from the slag inlet, flushing water enters the slag flushing ditch from the punching nozzles in a gathered manner, the flow distribution of the water granulated slag stream is conducted through the flow distribution device and the ultrasonic generation device, and the generation of foaming slag is inhibited; and the granularity of the water granulated slag is uniformized, harmful gas such as SOx and H2S is absorbed effectively, and waste gas is collected and treated by a waste collection device and then discharged. The ultrasonic punching device is simple in structure and environmentally friendly.

The invention discloses a method and system for improving the water cooling quality of a TMCP steel plate. The method and system are used for a TMCP production line. A pre-straightening machine is mounted on an inlet of water cooling equipment in the TMCP production line. The method comprises the steps that after the steel plate is rolled, the steel plate is controlled to advance towards the pre-straightening machine at first speed; the speed of the steel plate is controlled to be reduced to second speed at the position where the distance between the head of the steel plate and the center lineof the pre-straightening machine ranges from 2 m to 3 m, so that the steel plate enters the pre-straightening machine to be straightened at the second speed; and the steel plate passing through the pre-straightening machine is controlled to enter the water cooling equipment at the second speed, water cooling is completed, and the steel plate obtained after water cooling is obtained. The technicalproblem that in an existing TMCP, the water cooling quality of the steel plate is poor is solved.