37results about How to "No overheating phenomenon" patented technology

The invention relates to a process for producing dimethyl carbonate from industrial synthetic gas. According to the invention, O2, CO, N2, NO, and methanol are delivered into an esterification system for esterification; heavy component drawn from the esterification system is subjected to recovery treatment in a wastewater tower; light component drawn from the esterification system passes a compressor II and is subjected to a carbonylation reaction in a carbonylation reactor; the carbonylation reaction product is delivered into a second condensation separation tower, and is subjected to gas-liquid separation; separated liquid phase is refined in a pressurized rectification tower; part of non condensable gas is discharged from the separated gas phase, and the gas phase is continued to be subjected to a reaction in the esterification system; the discharged non-condensable gas is delivered into a denitration reactor; light component at a top of the pressurized rectification tower is subjected to further recovery treatment in a methanol recovery tower; heavy component from the pressurized rectification tower is delivered into a product tower; dimethyl carbonate is drawn from the top of the product tower, and dimethyl oxalate is drawn from the bottom of the product tower. The process has the economical and practical characteristics of low equipment investment, environment friendliness, energy saving, high catalyst efficiency, high raw material utilization rate, and the like.

The invention relates to a method for producing low iron aluminum sulfate by the utilization of coal gangue and belongs to the technical field of coal solid waste resource utilization. The method provided by the invention comprises the following steps of: carrying out calcination activation on coal gangue at the temperature of 785-850 DEG C, adjusting the pH of an aluminum sulfate solution by directly using the activated coal gangue, oxidizing divalent iron ions into trivalent ions, removing iron precipitate and a few gel in the aluminum sulfate solution by the utilization of the adsorption property of the coal gangue, producing low iron aluminum sulfate, recycling the removed iron slag, and terminating the recycling operation when the removed iron slag amount is greater than 120% of the acid-leach residue amount or the mass ratio of aluminium to iron in an iron-removing liquid is less than 160. The temperature of the calcinated coal gangue satisfies the operation condition for the boiling of a circulating fluidized bed. No addition of an auxiliary agent helps heat recovery. The activity of the coal gangue cinder is good, the grinding requirement is not high and the energy consumption is low. Hydrogen peroxide or ozone, air and variable valence element-containing hypervalent compounds KMnO4, MnO2 oxidizing agents are adopted to remove iron with less loss of aluminium. The ratio of Al2O3 to Fe in the product is greater than 160 and the quality of the product is high. The acid leaching reaction is carried out at normal pressure. And the production is easy to operate at low cost.

The present invention discloses a gas-fired hot water device and a control method thereof. The gas-fired hot water device comprises: a first heat exchanger; a combustion device; a second heat exchanger with a first flow passage and a second flow passage, wherein the first flow passage is capable of communicating with the first heat exchanger; a third flow passage capable of communicating with thefirst heat exchanger; a first flow regulating device capable of distributing fluid flowing out of the first heat exchanger between the first flow passage and the third flow passage; a first water pumpcapable of driving fluid flowing through the first heat exchanger to flow into the first flow passage and/or the third flow passage; and a controller capable of controlling the first flow regulatingdevice and regulating the flow quantity of the first flow passage and the third flow passage when the thermal load required for the second flow passage is less than the minimum power of the combustiondevice. According to the device and the method of the present invention, hot water temperature can always be ensured to reach temperature set by a user by regulating the first flow regulating deviceand shunting the third flow passage when the required heat load is less than the minimum power of the gas-fired hot water device, thereby improving user experience.

A solid catalyst for the gas-phase synthesis of dimethylether is composed of ZSM-5 molecular sieve (50-90 Wt%) and zirconium oxide or MCM-41 molecular sieve (10-50 Wt%). Its preparing process and reaction technology are also disclosed.

The invention discloses auxiliary equipment of an impeller cylinder combined engine. A cylinder is provided with a multi-stage air compressor for providing an air source for the engine and is provided with a high-pressure air storage tank; a first air injection hole outside the cylinder is provided with a heat preservation type combustion chamber and is connected with a group of air combustion switches for controlling; conditions are created for controlling the firepower and the air combustion ratio of the engine and doing work after air absorbs heat; one end of a first flow guide pipe and one end of a second flow guide pipe outside the cylinder are provided with a first flow guide branch pipe and a second flow guide branch pipe for heat preservation respectively; lubricating oil in the cylinder and the multi-stage air compressor is discharged into a first heat preservation type heat exchanger for heat exchange and then can be recycled; and a third exhaust hole outside the cylinder is provided with a second heat preservation type heat exchanger, and high-pressure air is subjected to heat absorption and pressurization by the two heat exchangers under the regulation and control of the air combustion switches and then returns into the cylinder through the two flow guide branch pipes for power assistance and work doing, so that the heat efficiency is higher. The heat engine belongs to an upgraded product of an internal combustion engine.

The invention discloses an asymmetric pipe-plate type bundle pipe reactor, which comprises a shell. Heat exchange pipes are arranged in the shell; the shell comprises a barrel-shaped barrel; only onefirst pipe-plate assembling unit is arranged on the upper end in the shell; three to six second pipe-plate assembling units are arranged on the lower end in the shell; the first pipe-plate assemblingunit is provided with only one first pipe plate; each second pipe-plate assembling unit comprises a second pipe plate; the upper end of each heat exchange pipe is connected with the first pipe plate;the heat exchange pipes are divided into multiple pipe groups; the lower end of the heat exchange pipe of each pipe group is arranged on one second pipe plate. The invention also discloses a methanolsynthesis process using the bundle pipe reactor. According to the reactor, the heat exchange pipes and the pipe plates are reasonably arranged in a limited space, so that an overhaul space of the reactor is enlarged within an allowable range, and the reactor can be processed and overhauled conveniently.

The invention relates to a method for preparing liquefied natural gas from semi-coke tail gas. The method includes: firstly, after decoking and benzene and naphthalene removal of semi-coke tail gas, and sending to a rectisol unit for purification and desulfurization; then, mixing the desulfurized semi-coke tail gas with high-methane gas, jointly sending into a methanation unit for methanation to obtain a crude methane gas product, sending into the rectisol unit for purification and decarbonization; finally, performing cryogenic separation to remove nitrogen to obtain liquefied natural gas. Compared with the prior art, the method has advantages that by semi-coke tail gas treatment through the rectisol unit and the methanation unit, circulation absorbing agent consumption is sharply reduced,and energy consumption and system CH4 loss in a decarbonization process are reduced; in addition, by adoption of recovered CH4-rich gas and injection of water and/or system self-produced water vaporinto the methanation unit, methanation reaction temperature rise can be controlled so as to guarantee a methanation process against temperature runaway; moreover, heat balance of a whole system can beeffectively realized in the whole process, and economy in preparation of LNG (liquefied natural gas) from the semi-coke tail gas is improved.

The invention relates to a pretreatment method for desulphurization adsorbents. The pretreatment method comprises: desulphurization adsorbents and hydrocarbon raw materials containing alkenes are subjected to contact reaction under a non-hydrogen condition. The invention also relates to a desulphurization method for sulfur-containing hydrocarbon raw materials. The desulphurization method comprises: desulphurization adsorbents are pretreated according to the above method, and the pretreated desulphurization adsorbents are obtained; sulfur-containing hydrocarbon raw materials, hydrogen donors and the pretreated desulphurization adsorbents are subjected to contact reaction under an adsorption desulphurization reaction condition. The pretreatment method for desulphurization adsorbents takes an obviously short time, and when catalytic cracking gasoline with high content of alkenes is subjected to desulphurization, the pretreated desulphurization adsorbents obtained through the pretreatment method can prevent reactor temperature runaway phenomena caused by vast alkene saturation during the startup process effectively, and the startup difficulty is lowered.

The invention discloses an ageing treatment process for an Al-Er-Li alloy, and belongs to the technical field of non-ferrous metals. The alloy consists of the following components in percentage by mass: 0.1-0.19% of Er, 2.0-2.1% of Li, less than 0.1% of inevitable impurities and the balance Al. The ageing treatment process comprises the following steps of: casting the Al-Er-Li alloy, performing solid-solution treatment, and performing equal-temperature aging treatment for 24-48 hours at a temperature of 175-200 DEG C. After treated by the process, the Al-Er-Li alloy has peak ageing hardness which is kept to be higher than 100 HV.

The invention relates to a 2324 aluminum alloy and a homogenization heat treatment method thereof, and belongs to the technical field of aluminum alloy heat treatment, and the homogenization heat treatment method of the 2324 aluminum alloy comprises the steps that an aluminum alloy ingot is heated to 494-495 DEG C and then heated to 498-500 DEG C for 25-30 h, and finally the aluminum alloy ingot is air-cooled to 20-25 DEG C. According to the method, by means of slow heating at the melting temperature of the low-melting-point eutectic phase, the influence of the temperature on eutectic phase redissolution is fully exerted, redissolution of the low-melting-point eutectic phase is accelerated under the condition that it is guaranteed that the cast ingot is not overburnt, the redissolution time of theta (Al2Cu) and S (Al2CuMg) formed through non-equilibrium solidification is greatly shortened along with temperature rising, and therefore the casting quality of the cast ingot is improved. The time for homogenizing heat treatment of the aluminum alloy cast ingot is saved to a great extent, the heat treatment cost of the aluminum alloy is saved, and the machining efficiency of the aluminum alloy is improved.

The invention discloses a portable device and method for banked blood rewarming. The portable device for banked blood rewarming includes a portable casing, a heating piece, a rotating drum, a drivingmechanism and a controller. The heating piece, the rotating drum, the driving mechanism and the controller are located in the portable casing, the controller is connected with the driving mechanism, the driving mechanism is connected with the rotating drum and drives the rotating drum to rotate, the rotating drum is horizontally arranged, the rotating drum can rotate with the horizontal center line as the axis, the controller is connected with the heating piece, and the controller can control the heating of the heating piece and the rotation of the rotating drum. The portable device has the advantages that the portable device is simple to operate and simple in structure, the cost is reduced, banked blood is heated evenly, and the portable device is safe and reliable.

The invention provides a heat exchanger arrangement structure of a pre-concentration tower. By means of the heat exchanger arrangement structure, arrangement of heat exchangers is reliable and effective, and it is ensured that gas-liquid separation is efficient. The heat exchanger arrangement structure comprises a bottom transverse plate, a first longitudinal partition plate, the multiple heat exchangers, a second partition longitudinal plate assembly and a third longitudinal partition plate. One end of the bottom transverse plate extends to the corresponding position below a liquid inlet. Thefirst longitudinal partition plate blocks the corresponding height position of the liquid inlet. A third longitudinal partition plate protruding upwards is arranged at the other end of the bottom transverse plate. The multiple heat exchangers are arranged in the area, corresponding to the space between the first longitudinal partition plate and the third longitudinal partition plate, of the bottom transverse plate. The multiple heat exchangers are divided by the second partition longitudinal plate assembly to form two independent heat exchange cavities specifically including the first heat exchange cavity and the second heat exchange cavity. The second partition longitudinal plate assembly specifically comprises a first upper limiting partition plate and a second lower limiting partitionplate. The bottom of the first upper limiting partition plate is fixedly connected to the bottom transverse plate.

The invention provides a high-temperature powder-containing gas cooling treatment and heat recovery device. The high-temperature powder-containing gas cooling treatment and heat recovery device comprises a barrel shell part, a gas outlet pipe fixing plate, a gas distribution pipe fixing plate, a gas-steam partition plate, a plurality of gas distribution guide pipes, a plurality of heat exchange branch pipes, a plurality of gas outlet guide pipes, a cooling gas outlet pipe, a steam outlet main pipe, a water supplementing pipe, a hot gas inlet pipe and a liquid level meter. According to the high-temperature powder-containing gas cooling treatment and heat recovery device, heat in gas is recovered in a steam form, the poor quality phenomenon (such as agglomeration and aerogel characteristic loss) that water vapor in the gas is condensed and consequently powder is damaged is avoided, and reliable conditions are provided for normal operation of equipment for collecting nanoscale powder in the gas through a dry method; hot gas flow is evenly distributed in each heat exchange branch pipe, the heat exchange efficiency is improved, the temperature of the gas in each heat exchange branch pipe is uniform, and the water vapor condensation phenomenon and the too high temperature phenomenon of the gas flow in each heat exchange branch pipe are avoided; and the high-temperature powder-containing gas cooling treatment and heat recovery device has the beneficial effects that blockage of a gas flow pipeline is avoided, the structure is compact, safety is high, and the service life is long.