30results about How to "Realize graded recycling" patented technology

The invention provides a brine concentration method for sea salt production and belongs to the technical field of sea salt production. The method comprises steps as follows: seawater enters a pretreatment device for removal of impurities and enters a nanofiltration device for removal of divalent ions, nanofiltration producing water enters a multi-stage high-pressure reverse osmosis device for highconcentration, and high-concentration saline water is prepared; part of high-pressure reverse osmosis producing water is subjected to low-pressure reverse osmosis for preparation of pure water, and the other part of water flows back to a seawater desalting plant. The multi-stage high-pressure reverse osmosis device is formed through series connection of high-pressure reverse osmosis membrane groups in a form of continuous section groups, producing water of each section of the high-pressure reverse osmosis membrane groups flows back for use or enters a pure water preparation process, concentrated water of each section of the high-pressure reverse osmosis membrane groups enters the downstream high-pressure reverse osmosis membrane groups, the purpose of high concentration is finally achieved through continuous series connection, and strong brine is prepared. According to the method, more efficient concentration is realized, factory brine preparation is realized, the tedding area for salt making is greatly reduced, graded reuse of producing water is realized, utilization efficiency of the producing water is improved, and treatment cost is reduced.

The invention provides a method for co-preparation of bamboo activated carbon, bamboo vinegar and bamboo tar. The method for co-preparation of the bamboo activated carbon, the bamboo vinegar and the bamboo tar takes bamboo wood as raw materials, and through multi-stage machining of a three-stage conical screw extruder, achieves graded recovery of by products of the bamboo vinegar and the bamboo tar and overcomes the technical defect in the prior art that, due to difference in technical conditions, collecting methods and processing methods, obtained bamboo vinegar and bamboo tar are large in quality discrepancy and incapable of achieving effective separation and purification. Therefore, the method for co-preparation of the bamboo activated carbon, the bamboo vinegar and the bamboo tar achieves graded recovery of the by-products of the bamboo vinegar and the bamboo tar, obtains the bamboo vinegar and the bamboo tar of different grades and greatly improves the value added of the by-products of bamboo activated carbon production.

Provided are a plate-type multi-stage flash distillation apparatus for desulfurization wastewater treatment and recovery and a method therefor. The apparatus is mainly composed of plate-type heat exchangers, a plate-type condenser (12), a boiler (29), flash distillation tanks, freshwater tanks, water pumps and stainless steel pipelines. A pretreated desulfurization wastewater is brought into the plate-type heat exchanger stage by stage, heated to a certain temperature, and then brought into a first stage flash distillation tank (5) for flash distillation, the secondary steam is brought into the next-stage plate-type heat exchangers and condensed to release the latent heat to preheat the desulfurization wastewater, the concentrated desulfurization wastewater is brought into the next-stage flash distillation tank for flash distillation, and the process is carried out in sequence to the final stage, in which the secondary steam is brought into the plate-type condenser (12), the condensed fresh water in each stage is brought into a freshwater pool (17) for recycling, a part of the concentrated desulfurization wastewater is used as a circulating liquid to maintain the continuous proceeding of the flash distillation process, and a part thereof is brought into a concentrated liquid treating pool (19) and subjected to a centralized treatment. The apparatus and method can recover the latent heat of the secondary steam, has a high concentration multiple, a small occupation area and a low energy consumption, and can achieve zero release of the desulfurization wastewater.

The invention relates to a method and a device for reducing methanol content in a formaldehyde process by a silver method, and belongs to the technical field of chemical production. The technical scheme is that the method comprises the following steps of: after thermally recovering and cooling a formaldehyde liquid at the bottom of an absorption tower in the formaldehyde process by the silver method, extracting and feeding part of the formaldehyde liquid to a vacuum groove; conveying gas analyzed at the top of the vacuum groove to an inlet of an air fan; arranging a concentration evaporator between the outlet of an oxidation reactor and the inlet of the absorption tower; evaporating and condensing residual liquid of the evaporator by reaction waste heat at 90-110 DEG C; evaporating methanol in the residual liquid with water; recovering mixed gas of vapor and methanol steam to material gas; and recovering methanol which is less than 0.5% in percentage by weight in the condensed residual liquid to the absorption tower. According to the invention, the inlet temperature of the absorption tower is reduced, while the heat recovery efficiency of the system is improved. The load of a water cooler of the absorption tower is reduced, and the consumption of cooling water is reduced, so that the residual liquid is recovered in grades by 100%, and methanol recovered is free from backmixing, therefore, the energy-saving, consumption reducing and environmental protecting purposes are realized.

The invention discloses a microgravity vacuum environment oriented lunar surface in-situ resource 3D printing device, and belongs to the manufacturing field of spatial additive manufacturing. The device is characterized in that the obtaining and screening of surface particular materials of lunar soil, lunar dust and the like are achieved by a lunar surface in-situ resource grabbing and screening unit; a 3D printing shaping unit is formed through ink jetting, 3D printing is conducted by using screened particular materials, and the device is suitable for lunar surface microgravity vacuum environment and the 3D printing manufacturing of large components of future lunar base. The device has the advantages that the lunar surface in-situ resources are taken as printing consuming materials, the materials do not need to be carried to the moon through spatial transportation, so that transportation energy consumption is greatly reduced, the manufacturing cost is reduced, and the device is particularly suitable for the production of components of lunar base building facilities, mechanical parts and the like.

The invention discloses a vertical draft sintering machine and a sintering process. The sintering machine includes at least two sintering chambers arranged vertically at intervals. The top of the sintering chamber is the feeding end and the bottom is the discharging end. The grates are connected to the gas outlet flue, and the air inlet channel and / or the gas outlet flue are shared between two adjacent sintering chambers. The sintering process is to add the sintering mixture from the feed end of the top of the sintering chamber, and finally the sintered ore is discharged from the discharge end of the bottom of the sintering chamber; In the sintering chamber, the flue gas in the sintering chamber enters the gas outlet flue on the other side of the sintering chamber through the grate bar under the action of negative pressure and is discharged. The air inlet channel and / or the gas outlet flue are shared between two adjacent sintering chambers. The invention has the advantages of simple structure, small smoke generation, no air leakage problem, good stability, small occupied area, high waste heat utilization rate, improved sintered ore quality, energy saving and consumption reduction.

The invention discloses a method for regeneration treatment of oil-based drilling fluid, which comprises the following steps: S1. Pump waste oil-based drilling fluid to a vacuum low-temperature high-efficiency film evaporator for rapid evaporation, and the evaporated mixed gas is cooled into a liquid phase and then enters The first collection tank is recovered; S2, the oil and solid mixture in the vacuum low-temperature high-efficiency film evaporator is pumped into the circulating thermal desorption device for pyrolysis, and the pyrolysis gas enters the controllable condenser to generate condensate; S3, the circulating heat The combustion chamber of the hydrolysis device produces high-temperature tail gas, and the high-temperature tail gas exchanges heat with the normal-temperature air through an air-gas indirect heat exchanger to obtain hot air and low-temperature tail gas; S4, the tail gas is discharged up to the standard; S5, the circulating thermal desorption device discharges the solid phase through the high-temperature spiral ; S6, mixing the recovered liquid phase collected by the first collection tank in step S1 and the condensate collected by the second collection tank in step S2 at a ratio of 5:1 to obtain a mixed solution, and recovering oil and recovered water by processing the mixed solution.

The invention relates to a smoke exhaust heat utilization device of a directly-fired triple effect machine, comprising a directly-fired high pressure generator (9), a medium pressure generator (11), a low pressure generator (13), a high temperature solution heat exchanger (8), a medium temperature solution heat exchanger (7) and a low temperature solution heat exchanger (5). A smoke outlet pipe (10) of the directly-fired high pressure generator (9) is internally and additionally provided with a smoke exhaust heat utilization device (15); the shell side of the smoke exhaust heat utilization device (15) is sequentially provided with a high temperature smoke heat exchange tube bundle (16), a medium temperature smoke heat exchange tube bundle (17) and a low temperature smoke heat exchange tube bundle (18) upwards along the smoke flow direction; the tube side of the high temperature smoke heat exchange tube bundle (16) is arranged in series on a solution pipeline for entering and exiting the directly-fired high pressure generator (9); the tube side of the medium temperature smoke heat exchange tube bundle (17) is arranged in series on a solution pipeline for entering the medium pressure generator (11); and the tube side of the low temperature smoke heat exchange tube bundle (18) is arranged in series on a solution pipeline for entering the low pressure generator (13). The inventioncan further improve the fuel heat utilization ratio of the directly-fired triple effect machine, reduce the temperature of smoke exhaust and reduce the heat loss of smoke exhaust.

The invention discloses a coke drying system dry gas temperature and flow self-adjustment control device and method. A high-temperature waste gas branch pipe and a low-temperature waste gas branch pipe are arranged at the front end and the rear end of a heat exchanger, flow control valves are arranged on the branch pipes, a temperature sensor is arranged on a dry gas header pipe behind an induced draft fan, and high-temperature waste gas and low-temperature waste gas are controlled by the temperature sensor and the flow control valves on the two branch pipes to be mixed to reach the temperatures needed by the coke drying process. The high-temperature hot blast stove flue waste gas branch pipe and the low-temperature hot blast stove flue waste gas branch pipe are arranged at the front position and the rear position of the hot blast stove flue waste gas heat exchanger, flow of the two branch pipes is controlled through feedback of the temperature sensor, the dry gas temperature self-adjustment function can be achieved, graded recycling of hot blast stove flue waste flue gas heat can also be achieved, waste of waste gas heat is avoided, and remarkable economic benefits and energy-saving benefits are achieved.