57results about How to "Low grade requirements" patented technology

The invention discloses a low-pressure ethanol recovery device and method with triple effect rectification. The low-pressure ethanol recovery device with triple effect rectification comprises a first rectifying tower, a second rectifying tower, a third rectifying tower, a rectifying tower reboiler, a rectifying tower feed preheater, a condenser, a return tank, a dilute ethanol feed preheater, a temporary finished product storage tank and a finished product cooler. In the ethanol recovery method with triple effect rectification, by controlling the recovery of the finished ethanol in the second rectifying tower, the content of ethanol in tower bottom wastewater of the second rectifying tower is 5wt%-30wt%, the temperature of the tower bottom wastewater is 100-120 DEG C, and the working pressure of the third rectifying tower is 250-400kPa. The invention adopts the low-pressure triple effect rectification technique and reduces energy loss in the technical process, thus greatly reducing the energy consumption; and the operating pressure and temperature of the third rectifying tower are greatly reduced, and the requirements on the high temperature resistant and corrosion resistant properties of equipment are reduced, thereby reducing the equipment investment and the maintenance cost.

The invention discloses a distillation dehydration device and a distillation dehydration process for co-producing ethanol fuels and custom grade edible alcohols. The device comprises a molecular sieve adsorption/desorption tower, a coarse fractionating tower, an assembled tower, a rectifying tower, a methanol tower and mash pre-heaters, wherein the wine steam of the assembled tower, after compressed by an ethanol steam compressor, is used as the heat sources and raw material wine steams of the coarse fractionating tower and the methanol tower; the wine steam of the rectifying tower is used asthe heat source of the assembled tower; and the wine steam of the coarse fractionating tower, the anhydrous alcohol steam and the wine steam of the methanol tower are respectively used as the heat sources of the first, second and third mash pre-heaters. The device can simultaneously produce ethanol fuels and custom gradeedible alcohols, and can separately produce ethanol fuels or custom grade edible alcohols. The device and the process of the invention have the advantages that, because a multi-effect energy coupling mode is adopted, compared with an original process, the energy consumption ofthe process of the invention is greatly reduced, and the steam consumption of the ethanol fuel per metric ton is reduced to 1.1 to 1.5 t/t, compared with the steam consumption of 1.5 to 2.0 t/t in the original process, the steam consumption is down by 25 to 35 percent without consuming high-grade steams (more than 0.7 MPag); and the steam consumption of the custom grade edible alcohol per metric ton is reduced to 1.2 to 1.4 t/t, compared with the steam consumption of 1.9 to 2.5 t/t in the original process, the steam consumption is down by 35 to 50 percent.

The invention discloses a synchronous desulphrization and denitration method of flue gas pyrolusite pulp for reclamation. The method mainly comprises the following steps: pyrolusite, water and metal-chelator are prepared into pulp which is taken as an absorbing agent; sulfur dioxide and nitrogen oxides in the flue gas are synchronously absorbed and removed by the absorbing agent; the flue gas is discharged when the purification reaches a standard; the primary product of the mixed mother solution of manganese sulfate and manganese nitrate is obtained after absorbing tail solution is purified; and by utilizing the different solubility of manganese sulfate and manganese nitrate at same temperature, the mixed mother solution is heated firstly to cause the manganese sulfate therein to be crystallized and separated, next, the left mother solution is cooled to cause the manganese nitrate therein to be crystallized and separated, and the left solution is returned to preparation pulp for recycling. No waster water is discharged in the whole process, thereby achieving the purposes of controlling waste by waste, recycling sulfur resources and improving the comprehensive utilization value of pyrolusite. The method is characterized by high desulphrization and denitration efficiency and manganese utilization rate, little secondary pollution, obvious economic benefit and the like.

The invention provides a transformation method for preparing potassium nitrate via nitratite, which adopts the technology steps that the ore is crushed until the grinding diameter is below 2cm, and multilevel counterflow heat immersed making the content of NaNO3 equal and more than 450g/l; potassium chlorate is added for heat transformation; four-effect evaporation is applied for brine evaporation and saline miner degree after degree, making the content of KNO3 equal and more than 800g/l; finished product potassium nitrate is obtained through three level vacuum cold crystallization, centrifugal detach and then drying. The nitrate recovery yield of the invention is above 75%, the potassium recovery yield is above 85%. The invention has the advantages of simplifying the technological process, saving investment cost, having high power-efficiency utilization ratio, and being suitable for low grade soda-nitre mine coal mining.

The invention discloses a lithium bromide absorption type water chilling unit for a direct cooling type cold-blast air evaporator, which comprises a lithium bromide absorption type water chilling unit and a refrigerant circulator and a lithium bromide solution circulator thereof, wherein the lithium bromide absorption water chilling unit comprises a condenser 1, a generator 2, a direct cooling type cold-blast air evaporator 3, an absorber 4, a solution heat exchanger 5, a solution pump 6 and a refrigerant pump 7, and the water chilling unit is directly connected with an air conditioner air system. The lithium bromide absorption water chilling unit is characterized in that the direct cooling type cold-blast air evaporator 3 is a vacuum closed cylinder consisting of air-cooled heat transfer pipe sets 9, and air is cooled in an air-cooled manner. By adopting the invention, the contradiction between unit performance and heat source grade in the traditional lithium bromide absorption water chilling technology is eliminated, the unit performance parameter is improved, and advantages are created for continuous application of solar refrigerating air conditioners and comprehensive utilization of low-temperature waste heat and exhaust heat.

The invention relates to a production method of feed-grade monocalcium phosphate. The production method of feed-grade monocalcium phosphate comprises the following steps: firstly, purifying phosphoric acid by wet process with the concentration of 45-60wt% in percentage by mass of phosphorus pentoxide to the feed grade standard; secondly, grinding natural calcium carbonate mine into fine powder, wherein the content of CaCO3 in the natural calcium carbonate fine powder reaches 95wt% above; thirdly, carrying out matching and metering reaction on phosphoric acid and the natural calcium carbonate fine powder according to the range of Ca/P=0.56-0.65, and adding feed-grade monocalcium phosphate returning charge; fourthly, feeding the resultant in the step 3 into a curing storeroom, and curing for 72 hours above; drying the cured materials, and drying a finished product until the water content is 1-4wt%; and sixthly, crushing and screening the dried product to obtain the feed-grade monocalcium phosphate product conforming to the GB22549-2008 standard. According to the production method disclosed by the invention, other production technological defects are overcome, the feed-grade monocalcium phosphate product is synthesized by one step; the raw material grade requirement is low; the technological process is short; white fertilizers and waste water are not generated.

The invention relates to an absorbent solution circulating system and a method. The absorbent solution consists of absorbent and working substance; and the absorbent solution circulating system comprises a generator, an absorber, an absorbent crystallizer and an automatic absorbent solution heat exchanger. The absorbent crystallizer is used for cooling absorbent solution from the generator and/or absorbent solution from the absorber to form crystallized absorbent solution and absorbent crystals, the crystallized absorbent solution is delivered to the generator, and the absorbent crystals are delivered to the absorber; and the automatic absorbent solution heat exchanger is used for exchanging heat with the crystallized absorbent solution and/or absorbent crystals with the absorbent solution from the generator and/or the absorbent solution from the absorber. The system can achieve circulation of the absorbent solution between the generator and the absorber in the circulation of an absorption heat pump, so as to improve grade of cold or heat outwards output by the circulation of the absorption heat pump and efficiency.

The invention discloses a method for preparing potassium chloride from low-grade potassium resource ore at low energy consumption, and relates to the technical field of inorganic salt. The method comprises following steps: 1, decomposing low-grade potassium resource ore; 2, evaporating potassium dissolved brine to prepare sylvine and carnallite; 3, preparing artificial sylvine; 4, preparing a sylvine solution; 5, diluting the sylvine solution; 6, building a solar pond; 7, horizontally filling the solar pond layer by layer; 8, running the solar pond; 9, hot melting sylvine; 10, filtering; 11, cooling and crystallizing; and 12, low-temperature mother liquor recycling. The method has the beneficial effects that the energy consumption is low, the cost is saved, utilization of low-grade potassium resources is improved, the solubility of potassium chloride is improved, and the energy consumption in the recycling process of the low-grade potassium resources is reduced.

The invention relates to the technical field of preparation of novel building materials, and discloses a method for reducing the preparation cost of sulphoaluminate cement. The method performs modification of fly ash, and the obtained modified fly ash is used as a bauxite substitute for preparing sulphoaluminate cement clinker; rare earth is used for activating hydration activity of mineral substances in the coal ash so as to provide early hydration strength for cement, and the stability of later activity is maintained; the method has a fast hydration speed, stimulates activity, exerts later strength, improves the microstructure of the sulphoaluminate cement slurry, inhibits the later strength from collapsing, is very beneficial to the performance development of sulphoaluminate cement, andreduces the production cost of cement. The prepared sulphoaluminate cement has the 3-day compressive strength of 56 MPa or above and the 28-day compressive strength of 78 MPa or above, fly ash is effectively utilized, and the cost is reduced.