90results about How to "Reduce evaporation energy consumption" patented technology

The present invention discloses a desulfurization and denitrification method for tail gas, used equipment and product application thereof. According to the method provided by the present invention, an oxidative catalyst is not used in a desulfurization column or a denitration column, or a small amount of the oxidative catalyst with a simplified formula added is used outside the desulfurization column and the denitration column, so that the cost is reduced significantly. The oxidative catalyst is not used in the desulfurization column or the denitration column to avoid the severe corrosion of the desulfurization column and denitration column texture by the material, so that the texture cost of the desulfurization column and the denitration column is reduced significantly; The volume of the processed material is small: only 30%-10% of the material in volume in the desulfurization column and the denitration column, and the cost for equipment corrosion prevention is lowered, so that a small amount of the oxidative catalyst used and a simplified formula can be facilitated.

The invention provides a production method of a cement-based grouting material. The method comprises the steps that aggregate and/or a binding material are mixed with a liquid additive, weight ratio of the aggregate and/or the binding material with the liquid additive in the mixture is (90-110) : (0.1-30); the obtained mixture is subjected to a drying process and can be mixed with polymer rubber powder which can re-disperse to obtain the cement-based grouting material. According to the production method, a liquid additive which is not easy to dehydrate and dry, which relates to polycarboxylate superplasticizer particularly, can be dried easily, the performance of the additive can be retained to the greatest extent, the aggregate or the binding material which is subjected to preprocessing of the liquid additive is mixed into other materials according to a specified proportion of the cement-based grouting material, and a cement-based grouting material product with good performance can be produced.

The invention provides a system and a method for cooperatively processing secondary aluminum ash by virtue of a cement kiln. The system comprises a waste residue preprocessing system, an anaerobic wet-grinding conversion system, an alkali metal salt leaching system and a cement kiln resourceful treatment system which are sequentially connected, wherein all equipment and connecting pipelines in thesystem are sealed, and a suction machine is arranged so as to generate a micro-negative pressure. The method comprises the following steps: (S1) secondary aluminum ash preprocessing, (S2) anaerobic wet-grinding conversion, (S3) alkali metal salt leaching, and (S4) cement kiln resourceful treatment. According to the system and the method, the harmless and resourceful final treatment of the secondary aluminum ash can be realized, 0.1t-0.3t of alkali metal salt, 0.02t-0.1t of caustic soda and 0.5t-0.8t of aluminum oxide byproducts can be extracted during the treatment of 1t of secondary aluminumash, and 0.2t-0.3t of cement raw materials and 0.05t-0.2t of a denitration agent can be provided for a cement plant. By utilizing an anaerobic wet-grinding conversion machine, H2 and CH4 generated inthe conversion process do not burn and explode, the disinfection and conversion of solid waste residue materials can be realized, and converted gas can be extracted.

The invention provides a system and method to treat electrolytic aluminum waste residue and co-produce quick-setting quick-hardening cement under cooperation of a cement kiln, wherein the system comprises a waste residue pretreatment system, a conversion reaction system, an alkaline metal salt extraction system and a cement kiln-based parallel production system of quick-setting quick-hardening cement, which are connected in sequence; all units in the system are hermetically connected, and a suction unit is provided to form micro negative pressure. The method comprises the steps: waste residuepretreatment; conversion reaction; extraction of alkaline metal salts and cement-kiln-based parallel production of quick-setting quick-hardening cement. The system and method herein have the advantages that electrolytic aluminum industrial waste residue can be centrally and uniformly treated at a time to eliminate its toxicity and hazard, and harmless, resourceful and final treatment of the electrolytic aluminum waste residue is achieved. The system and method are also capable of producing special quick-setting quick-hardening cement under low energy consumption and low cost, with no three wastes discharged and no secondary pollution caused.

The present invention provides an alumina mother liquor MVR circulation evaporation device and process, technical features are as follows: seed precipitation mother liquor first enters a preheater for heat exchange with vapor condensate water, then enters an evaporator for evaporation, and then enters a vapor-liquid separator; vapor flows out from the top of the vapor-liquid separator, then enters a vapor compression machine to form secondary vapor by temperatures and pressure increase under the effect of the vapor compression machine, and re-enters the evaporator to form a vapor circulation loop; at the same time, the separated mother liquor flows out from the bottom of the vapor-liquid separator, one part of the separated mother liquor flows again back to the evaporator to form a mother liquor circulation loop, and the other part of the separated mother liquor is discharged from a discharge port. The alumina mother liquor MVR circulation evaporation device can be used for alumina mother liquor circulation evaporation, and improves the quality of alumina evaporation mother liquor; the secondary vapor and the condensate water both can be recycled, the evaporation energy consumption is effectively reduced, and the producing capacity of the evaporation process can be improved.

The invention discloses a method for recovering alumina. The method comprises: dissolving out industrial waste containing aluminum and / or associated ore containing aluminum in a solution containing alcohol-alkali; and conducting washing, silicon impurity removal, crystallization treatment and roasting treatment to obtain alumina. Compared with the existing alumina recovery method, the alumina recovery method of the present invention has higher recovery rate and lower energy consumption.

The invention discloses a high-salt and high-COD wastewater recovery zero-discharge technology which comprises the following steps: 1, pre-treating high-salt high-COD wastewater to remove COD, total nitrogen, SS and heavy metal ions; 2, carrying out double-stage concentration on pretreated wastewater by adopting RO-NF-NF-RO concentration so as to obtain a high-concentration Na2SO4 solution and a high-concentration NaCl solution; and 3, filtering the high-concentration Na2SO4 solution and the NaCl solution by adopting a high-pressure flat sheet membrane, and evaporating and concentrating to obtain crystalline salt with the purity of higher than 99%. According to the technology, high-salinity wastewater is progressively treated step by step, no wastewater is discharged in the whole process,characteristic target pollutants can be removed, the water inlet requirement of the next step reaction can be guaranteed, and the wastewater recovery rate of the system process is close to 100%.

The invention discloses a black liquor treatment method combining lignin extraction and synthesis gas production. The method comprises the following steps: lignin extraction, acidic filtrate recycling, dilute black liquor evaporation and concentration, black liquor gasification, alkali fusant dissolution, green liquor causticization, gasified gas desulfurization, and sulfuric acid preparation. Dilute black liquor produced by boiling is divided into two parts; 30-50 wt% of the dilute black liquor is subjected to lignin extraction; part of the acidic filtrate generated from lignin extraction separation is used for acidification of the dilute black liquor, and the other part is subjected to alkalization, and used as a cooking liquor; 50-70 wt% of the dilute black liquor is conveyed into an evaporator for concentration to obtain 60-75% strong thick black liquor, which is sprayed into a gasification furnace for gasification, so as to obtain alkali liquor containing sodium hydroxide and sodium sulfide, and sulfuric acid. The method provided by the invention can recycle lignin (extraction rate of 30-50%) and alkaline substances (recycling rate of 80-90%) from the black liquor, produce synthesis gas and sulfuric acid for recycling within the system, and save energy by 5-10%.

The invention relates to a method for treating wastewater, in particular to a method for treating hydrometallurgical process wastewater, and pertains to the field of energy saving, emission reducing and environmental protection. The method utilizes solar energy or boiler residual heat to preheat high-density hydrometallurgical process wastewater; then the wastewater is sent to a multi-effect evaporator for at least trifle-effect vacuum continuous evaporation and flash crystallization under 0.01MPa to 0.09 MPa vacuum degree; part of the steam after the previous evaporation sequentially enters into the next evaporator and is utilized as the heat source; the condensed hot condensate of evaporators at all levels is recycled. The invention solves the problem that the high-density hydrometallurgical process wastewater is difficult to treat. The invention also has low energy consumption and the complex salt products after evaporation and crystallization can be reutilized.

The invention provides a treatment method of high-concentration salt-containing waste sulfuric acid. The treatment method comprises: (1) preparing a material slurry with a certain concentration from quicklime or limestone and water; (2) adding a proper amount of an inducer into a reaction tank containing high-concentration salt-containing waste sulfuric acid; (3) adding the material slurry into the reaction tank, stirring, measuring the pH value, stopping the adding of the material slurry when the pH value is increased to 3-5, and continuously stirring for a certain time; (4) adding a proper amount of calcium chloride into the reaction tank, and stirring for a certain time; and (5) filtering the solution in the reaction tank, carrying out evaporative crystallization on the filtrate, and drying the filter residue to obtain calcium sulfate dihydrate. With the treatment method of the invention, the salt content of the wastewater entering the evaporator can be greatly reduced, the evaporation energy consumption can be reduced, the yield of salty mud can be greatly reduced, the calcium sulfate dihydrate can be obtained, and the resource utilization of the high-concentration salt-containing waste sulfuric acid can be achieved.

The invention discloses a preparation method of cellulosic fibers. The preparation method includes the following steps that 1, cellulose pulp is mixed with an NMMO water solution with the mass concentration of 60%-85%, preferably 70%-76% to obtain a uniform mixture; 2, the obtained uniform mixture is subjected to dehydration swelling and dissolution defoaming to obtain a cellulose spinning solution; 3, the obtained cellulose spinning solution is filtered and subjected to heat exchange and then enters a spinning machine, after the cellulose spinning solution is extruded through a spinning assembly and air-cooled, the cellulose spinning solution enters a solidification system and is solidified in an NMMO solidification bath with the mass concentration larger than 50% and smaller than 72%, and nascent fibers are obtained; 4, the obtained nascent fibers are washed to obtain cellosilk bundles, and then the cellulosic fibers are obtained through subsequent section treatment. Equipment investment can be greatly reduced, the process is simplified, energy consumption and industrialization cost are reduced, safety production is promoted, the homogeneity and mechanical performance of the fibers are improved, and therefore the preparation method is more suitable for efficient low-consumption industrial production.

The invention discloses a membrane separation technology and particularly relates to a bipolar membrane device for preparing amino-1-propanol. The bipolar membrane device comprises a preprocessing part, a pre-concentrating part and a bipolar membrane part, wherein the preprocessing part is a teflon micro- and ultra-filtration membrane; electrodialysis is performed on the pre-concentrating part through a homogeneous membrane prepared by an impregnation method; the poles of the bipolar membrane part are nickel poles coated with tantalum, platinum and iridium; the bipolar membrane, which are resistant to strong acid and amino-1-propanol, of the bipolar membrane part is a single-plate-method perfluorinated-grafting bipolar membrane, the anode membrane, which is resistant to strong alkali and specially used for stopping alkali, of the bipolar membrane part is a perfluorinated-grafting carboxylic acid anode membrane, and the cathode membrane, which is resistant to strong acid and specially used for stopping acid, of the bipolar membrane part is a cathode membrane adopting a propyl quaternary amine functional group. The bipolar membrane device has the advantages that the overall service life of the device is greatly prolonged by more than 3 years, evaporation energy consumption is reduced greatly, product quality is increased, the material chamber conductivity of a bipolar membrane process is increased greatly, and energy consumption is reduced.

This invention describes a process for raising the temperature of the evaporating primary liquid. In the process, the evaporating primary liquid from the primary liquid pump enters a plate-type heat exchanger for the exchange of heat with a live steam condensate that enters the plate-type heat exchanger from a stripping condensate pump. After the exchange of heat, the heated evaporating primary liquid enters an evaporator for evaporation, and the cooled live steam condensate enters a thermoelectricity plant for flash evaporation. This invention has such advantages as low energy consumption and prevents drastic vibration of the transportation pipes.

The invention discloses an ethylamine production system for conducting membrane separation-hydrolysis treatment on wastewater. The ethylamine production system comprises a fixed bed reactor, a deamination tower, an ethylamine tower, a diethylamine tower, a dealcoholization water tower, an alcohol recycling tower, a triethylamine tower, an extracting tower, a reverse osmosis membrane separator, a hydrolysis rectifying tower and an evaporator; an outlet of the hydrolysis rectifying tower is communicated with an inlet of the evaporator; a tower top distillate opening of the hydrolysis rectifyingtower and a tower bottom outlet of the deamination tower are converged, and then the tower top distillate opening of the hydrolysis rectifying tower is communicated with a feeding port of the ethylamine tower; a dilute phase outlet of the reverse osmosis membrane separator is divided into two paths after running through a tee VI, one path is an outlet pipe for low-concentration wastewater, and theother path is converged with a distilled water outlet and then communicated with a heavy phase inlet. The invention further provides an ethylamine production technology for conducing membrane separation-hydrolysis treatment on wastewater through the production system. By the adoption of the method, the low-concentration wastewater is suitable for biochemical treatment.

The invention discloses a potassium chloride production process for decomposing carnallite with a cleaning solution. The potassium chloride production process is realized by the following steps of: a, dispersing carnallite by using a cleaning solution and putting the dispersed carnallite into a crystallizer; b, adding water in the crystallizer for decomposition, and controlling the concentration to be 31.5-31.7OBe'; c, subjecting a solution obtained after the decomposition to dehydration and separation to obtain crude potassium chloride and a decomposition solution; d, then, adding water into the crude potassium chloride for cleaning to obtain a potassium chloride solution with the concentration controlled to be 27-27.2OBe'; e, dehydrating the potassium chloride solution to obtain a potassium clloride product and a cleaning solution; and f, decomposing the carnallite by using the cleaning solution and repeating the steps b-e. By using the process disclosed by the invention, the carnallite is completely decomposed and particle uniformity of a product is ensured, and because the added water volume is reduced in a cleaning process, the losses of potassium chloride in the cleaning process are reduced.

The invention discloses a treatment technology of mother liquor of iron oxide red. The treatment technology comprises the following six steps: preprocessing by flocculation and depositing, pre-oxidizing, adjusting acid, performing low-pressure reverse osmosis, performing high-pressure reverse osmosis and performing MVR concentration evaporation. The technology is low in energy consumption, high inresource utilization rate, high in wastewater treatment efficiency, complete to treat, and free from secondary pollution; in addition, a complete closed-ring system is formed in the whole technology;the wastewater is recycled and is not drained.