59results about How to "Reduce ammonia consumption" patented technology

The invention relates to a method for desulfurizing and denitrating smoke simultaneously through an ammonia method, which is carried out in a desulfurizing and denitrating system. The desulfurizing and denitrating system comprises a desulfurizing and denitrating tower, the desulfurizing and denitrating tower is provided with a washing demisting segment, an absorption segment and an oxidation segment, wherein the absorption segment is provided with a first desulfurizing spray layer, a second desulfurizing spray layer and a denitrating spray layer from top to bottom; the oxidation segment is provided with a denitrating circulation layer, a desulfurizing circulation layer and an oxidation layer from top to bottom, wherein the denitrating circulation layer, the desulfurizing circulation layerand the oxidation layer are respectively communicated with the denitrating spray layer, the second desulfurizing spray layer and the first desulfurizing spray layer through circulating pipelines positioned outside the desulfurizing and denitrating tower; smoke enters from a smoke inlet, sequentially contacts with the absorption liquid of the denitrating spray layer, the second desulfurizing spraylayer and the first desulfurizing spray layer for denitration and desulfurization, then enters the washing demisting segment and then is exhausted; the absorption liquid of the spray layers descends to the oxidation segment and reacts on the oxidation layer to generate ammonium sulfate; and the absorption liquid of the denitrating circulation layer, the desulfurizing circulation layer and the oxidation layer is respectively delivered to the denitrating spray layer, the second desulfurizing spray layer and the first desulfurizing spray layer through the circulating pipelines positioned outsidethe desulfurizing and denitrating tower.

The invention discloses a process and system for treating nitrochlorobenzene ammonolysis wastewater. According to the process, ammonolysis wastewater is evaporated by using ammonia distilling equipment so as to liberate free ammonia; or an alkaline substance is added firstly so as to convert ammonium ions in the ammonolysis wastewater into the free ammonia, and then, evaporation is carried out; the free ammonia in vapor is absorbed by water and then returns to a material proportioning process of nitrochlorobenzene ammonolysis; and the evaporated wastewater enters an electrolysis and catalytic oxidation sewage treatment device for degradation, enters an ammonium chloride recovery device for ammonium chloride recovery and then can be discharged. Compared with the prior art, the process and the system have the advantages that the free ammonia is recovered and utilized in a cycling manner, so that the consumption of ammonia is reduced; after the free ammonia is recovered, the consumption of neutralizing acid is reduced, the volume of the wastewater is reduced, and the load of the sewage treatment device is reduced; and by adopting the process and the system, the recovery ratio of ammonia and ammonium chloride can be adjusted randomly according to the market price of liquid ammonia and ammonium chloride.

The invention relates to the technical field of environmental protection equipment, in particular to a double-oxidation, double-loop and double-demisting desulfurization tower and a processing device for carrying out desorption and recovery treatment for sulfur dioxide in flue gas from a boiler, wherein the tower body is divided into four sections, comprising an oxidation section, an oxidation evaporation saturation section, a purification absorption section and a demisting section from bottom to top; a flue gas inlet is arranged at the middle of the tower; the top of the tower is provided with a flue gas outlet and a dewatering and demisting section for desorbing water vapor; the bottom of the tower is provided with the oxidation section for collecting reaction products and carrying out ventilation oxidation for the reaction products; the dewatering and demisting section is provided with a device for demisting, filling and spraying process water; and the oxidation section is provided with a circulating liquid outlet which is connected to a spray system through a circulating pump. The invention has the beneficial effects of simple structure, convenient operation and maintenance, environmental protection, good double demisting effect, and low ammonia consumption; and in the invention, double oxidation efficiency reaches 99%, double circulation desulfuration efficiency is more than 98%, demisting effect is good, ammonia consume is low and the product ammonium sulfate reaches the standard.

The present invention provides new technological process of producing urea in a completely circulating high pressure solution system. On the basis of available high pressure system, three pieces of high pressure apparatus including one urea synthesizing tower, one synthesizing tower separator and one gas stripping column are increased, the original urea synthesizing tower is altered into the second one, the first urea synthesizing tower is for feeding CO2 and ammonia only and the second urea synthesizing tower is for pressure lowering operation. The system of the present invention has one 30-100 % raised production capacity and greatly lowered power consumption.

The invention discloses a flue gas conditioning agent for flue gas mercury removal and a composite flue gas purifying method thereof. The flue gas conditioning agent is ammonium bromide powder or ammonium bromide solution. The flue gas conditioning agent is put into a flue of a combustion system at 150-450 DEG C and activated by use of the temperature of the flue gas; the activated flue gas conditioning agent reinforces conversion of the elemental mercury steam to mercury oxide and particle mercury in a flue gas environment, and the activation of the flue gas conditioning agent and the oxidation and adsorption of mercury are performed at the same time; and then the flue gas mercury removal is realized by use of the existing flue gas purifying equipment of the system. According to the flue gas conditioning agent and the composite flue gas purifying method disclosed by the invention, the flue gas is subjected to trace conditioning at specific temperature, and the gas-phase oxidation or gas-solid catalytic oxidation process of the mercury steam in the flue gas environment is reinforced so as to change the state of mercury in the flue gas; and finally, the flue gas mercury removal is realized by use of the existing purifying equipment of the system. The use of an activated carbon-based adsorbent can be avoided, and the flue gas mercury removal is realized by use of the existing equipment while maintaining the reusing value of fly ash.

The invention belongs to the field of chemical industry, and in particular, relates to a dilute nitric acid production process. The process includes the following steps: after ammonia evaporation andheating, adjusting the flow quantity, allowing gas ammonia to enter an ammonia-air mixer and uniformly mixing the gas ammonia with compressed air; allowing the ammonia-air mixture after mixing to enter an oxidation furnace, carrying out catalytic oxidation reaction on a platinum mesh surface, oxidizing ammonia into nitric oxide, recycling waste heat from process gas leaving the catalyst through awaste heat boiler and tail gas respectively, and then condensing by a low-pressure quick cooler, after separation of dilute acid, mixing the process gas with air from a bleaching tower, and then allowing the mixed gas to enter an oxidation nitrogen compressor; further increasing the temperature of gas through the compressed process gas; recycling waste heat of the compressed process gas, cooling,and then allowing the cooled process gas to enter an absorption tower; and carrying out a reaction of oxide of nitrogen in the absorption tower after absorption with water to generate nitric acid. Theprocess has the advantages of high nitrogen oxide absorption rate, low ammonia consumption, high acid concentration and low tail gas emission concentration, and can reach the standard without furthertreatment.

The invention discloses a glass furnace flue gas desulfurization and denitrification system and process. The system comprises a glass furnace burner regenerative chamber primary denitrification unit, a flue gas dust removal device, a decomposition-process ammonia production device and a flue gas desulfurization and secondary denitrification unit. Primary denitrification of flue gas is completed in a glass furnace burner regenerative chamber by using ammonia as a denitrification agent, secondary denitrification can be realized during subsequent ammonia desulfurization, ammonia and ammonium hydrogen sulfate are produced by using a desulfurization product ammonium sulfate, the ammonia can be used as a primary denitrification absorbent, hydrogen peroxide is further produced by using the ammonium hydrogen sulfate and is used as an oxidant of NOx in the flue gas, residual liquid can be cyclically utilized, thereby the ammonia does not need to be externally supplied during the primary denitrification in the invention, and the secondary removal of the remaining NOx in the flue gas is realized in the subsequent ammonia desulfurization process. The glass furnace flue gas desulfurization and denitrification system and process disclosed by the invention are simple and the desulfurization and denitrification efficiency are high.

The invention belongs to the field of chemical synthesis, and particularly relates to a synthesis method of a 1,4-diamino-anthraquinone leuco body. The synthesis method comprises the following steps:adopting 1,4-diamino-anthraquinone as a raw material to mix with hydrazine hydrate and an organic solvent; reacting with ammonia gas for 3-4 hours under the conditions of the reaction pressure being 0.2-0.5 Mpa and the reaction temperature being 50-100 DEG C; exhausting ammonia gas after finishing reaction; and cooling, crystallizing, filtering and drying a reaction product to obtain the 1,4-diamino-anthraquinone leuco body. The synthesis method has the advantages of no high-COD (chemical oxygen demand), high-ammonia nitrogen and high-salinity waste water in the synthesis process, recyclability of filtrated stock, reduction of ammonia consumption, efficient reduction of production cost and high-purity and high-yield products, and is suitable for scale production.

The invention discloses a preparation method of high-purity solid hydroxylamine sulphate. The preparation method of the high-purity solid hydroxylamine sulphate comprises the following steps: adding a 5-15% hydroxylamine sulphate aqueous solution into a first reactor, mixing the hydroxylamine sulphate aqueous solution with 18-23% ammonia water, controlling the temperature of the first reactor to 20-30 DEG C, and regulating the pH value of the solution to 5.8-6.5, so that a first reaction product is obtained; fully mixing an extracting agent, a diluter and a stabilizer in a volume ratio of 1:(3-3.5):(0.001-0.002), putting the obtained mixture into a second reactor, regulating the pH value to 7.0-7.8 by adopting 18-23% ammonia water, and controlling the temperature of the second reactor to 20-30 DEG C, so that a second reaction product is obtained; carrying out extraction, concentration, cold crystallization, centrifugation and vacuum drying on the first reaction product and the second reaction product, so that the target product high-purity solid hydroxylamine sulphate is obtained. The preparation method of the high-purity solid hydroxylamine sulphate has the advantages of simple temperature, mild reaction conditions, high yield and low cost.

The invention relates to a dilute nitric acid device adopting a double pressure method, and the device can increase output at the high temperature season and improve heat energy recovery efficiency. The device is characterized in that a gaseous ammonia outlet of an ammonia evaporator is communicated with a cold fluid inlet of a second ammonia superheater; a cold fluid outlet of the second ammonia superheater is communicated with a cold fluid inlet of a first ammonia superheater; the gaseous ammonia outlet of the ammonia evaporator is communicated with the cold fluid inlet of the first ammonia superheater; a gaseous ammonia inlet of an ammonia filter is communicated with a cold fluid outlet of the first ammonia superheater; a tail gas outlet of a tail gas expansion machine is communicated with a thermal fluid inlet of the second ammonia superheater; an air filter, an air blast dehumidification device and an axial flow compressor are sequentially connected; a gas outlet of the air filter is communicated with a gas inlet of an air blower; a gas outlet of the air blower is communicated with a thermal fluid inlet of a heat exchanger; a thermal fluid outlet of the heat exchanger is communicated with an inlet of a demister; an outlet of the demister is communicated with an inlet of the axial flow compressor; a cold fluid outlet of the heat exchanger, a cold water pump, a refrigerating unit and a cold fluid inlet of the heat exchanger are sequentially communicated.

The invention relates to a denitration uniformity measurement optimizing system and method under fluctuating loads. The system comprises two flue inlets formed in a side A and a side B respectively and two SCR reactors arranged between two flue outlets, remote control adjusting doors (4) are formed between the two flue inlets and the two SCR reactors, grid method tour measuring devices (2) are arranged between the two flue outlets and the two SCR reactors, reference point calibration loops (3) are arranged between the two flue outlets and the two grid method tour measuring devices, and a uniformity analysis control system (1) is further arranged and connected with the remote control adjusting doors (4), the reference point calibration loops (3) and the grid method tour measuring devices (2) separately. According to the system and method, through the reference point calibration loops, the deviation influence of NOx overall fluctuation is removed, through the uniformity measurement result, the relative amplitude of NOx values at different position points is accurately reflected, and misjudgment and wrong adjustment caused by the influence of fluctuation are avoided.

The invention discloses a preparation method of ammonium bifluoride. The method comprises steps as follows: a, dilute ammonia water and ammonium bifluoride mother liquor are mixed to adsorb gas containing fluorine and silicon, and a mixed solution is obtained; b, the mixed solution and filter-press residues obtained in Step d are mixed for slurry making and filter-press separation, and a filtrate and a silica by-product are obtained; c, ammonia is introduced into the filtrate; d, slurry is subjected to filter-press separation, and an ammonium fluoride filtrate and filter-press residues are obtained; e, the ammonium fluoride filtrate is subjected to vacuum concentration; f, concentrated slurry is dissolved, the pH value of the solution is adjusted with hydrogen fluoride, and cooling crystallization is performed; g, ammonium bifluoride crystals are filtered, separated and dried, and the ammonium bifluoride product is obtained. With the adoption of the method, the utilization rate of fluorine and ammonia is increased, the gas containing fluorine and silicon is changed into the ammonium bifluoride product with the high economic value in the phosphoric acid production process, the production cost is low, the economic benefit is significant, meanwhile, the purity and other indexes of the product meet the requirement for superior products, and the method is suitable to be popularized and applied in the field.

The invention discloses a device for preparing sulfite. SO2-containing feed gas passes through a flue gas conditioning unit, then enters an acidic sulfite preparation unit and a basic sulfite slurry preparation and residual SO2 re-absorption unit in sequence, and is discharged out of the system; the synthesized intermediate slurry passes through an acidic sulfite conditioning and target product separating unit and a product drying unit in sequence, and finally a solid-phase target product or a liquid-phase target product is obtained. Ammonia in the feed gas can be fully recycled by the deviceand method, the ammonia consumption of a unit product can be reduced by 1/4-1/2, and the production cost of a target product is lower. The primary purity of the target product is high, secondary separation and purification are not needed, the loss in a purification step is avoided, and the yield of the target product can be increased by 0.8%-2.3% according to empirical analysis. The primary purityof the target product reaches 98.5-99.3%, one set of process equipment can be used for producing various products, and the market requirements can be better met.

The invention relates to a circulating spouting type NOx emission reduction system and a working method thereof. The circulating spouting type NOx emission reduction system comprises a rotary kiln, asmoke chamber, a spouting ring, a fuel system, a tertiary air pipe, a reactor, a first material distribution valve, a first cyclone cylinder, a denitration system, a decomposing furnace, a hopper anda second cyclone cylinder. An air inlet of the smoke chamber is connected with an air outlet of the rotary kiln, an air outlet of the reactor is connected to one side of the decomposing furnace and communicated with the interior of the decomposing furnace, and an air inlet of the reactor is connected with an air outlet of the smoke chamber through the spouting ring. An air outlet of the tertiary air pipe is connected to the bottom of the decomposing furnace, a feeding port of the hopper is connected to the lower portion of the air outlet of the tertiary air pipe, and an air inlet of the secondcyclone is connected with an air outlet of the decomposing furnace; The formation of NOX is effectively avoided or reduced so that the emission reduction efficiency of NOX is improved, and the ammonia water consumption of the denitration system is greatly reduced to save the production cost; meanwhile, the problem of serious material accumulation at the bottom of the decomposing furnace is solved, and secondary pollution can be avoided.

The invention discloses a device and a method for removing free ammonia from mixed slurry of ammonium sulfate and calcium carbonate, and belongs to the technical field of deamination. The method adopts the following technical scheme: feeding mixed slurry of ammonium sulfate and calcium carbonate to a deamination tank; and heating the slurry to be in a boiling state by steam under a negative pressure condition, and then feeding the generated mixed gas into a condenser; conveying an absorption liquid to an ammonia tank after the generated ammonia gas is absorbed by the absorption liquid in a hydraulic ejector. By adopting the technical scheme, the removal rate for removing the free ammonia from the slurry is over 90%, the removed free ammonia is recycled to prepare ammonium hydroxide, and the recovery rate can be up to 100%. In addition, a sulfuric acid does not need to be added in the technical scheme, the moisture content of the mixed slurry is reduced in deamination, the problem of unorganized emission of ammonia in the process of preparing ammonium sulfate from phosphogypsum is solved, the production intensity of a filter separator in the process for preparing ammonium sulfate from phosphogypsum is improved, ammonia consumption of the system is reduced, the production cost is reduced, and the production and operation environment is improved.

The invention discloses a heat self-exchange tube array fin dual ammonia preparation device, which is mainly composed of two absorption reactors. The inside of each absorption reactor can closely contact with the outer wall of a liquid ammonia steel cylinder, so that the liquid ammonia steel cylinder can be contained between the two absorption reactors; and array tubes and fins are arranged in the two absorption reactors. In the ammonia preparation process, the heat released from the absorption reaction can simultaneously absorbed by the liquefied ammonia gasification process through the array tubes and fins in the reactors, so as to reach the purpose of dual exchange of array tubes and fins; heat released from the reaction process is effectively removed, and heat required by liquid ammonia gasification is supplied, so as to facilitate the proceeding of the reaction towards the product generation direction as well as supply stable gasification temperature for liquid ammonia; and heat direct self-exchange of heat released in the absorption reaction and heat absorbed by liquid ammonia gasification in the system is realized, so that the ammonia preparation process is carried out and completed under efficient and stable conditions without the need of cooling water and electricity.

The invention discloses a method and device for recovering ammonia from nitrochlorobenzene ammonolysis wastewater. According to the method, ammonolysis wastewater is evaporated by using ammonia distilling equipment so as to liberate free ammonia; or an alkaline substance is added firstly so as to convert ammonium ions in the ammonolysis wastewater into the free ammonia, and then, evaporation is carried out; the free ammonia in vapor is absorbed by water, then returns to a material proportioning process of nitrochlorobenzene ammonolysis and is cyclically reused in a manner of serving as an ammonolysis raw material; and then, the treated wastewater is subjected to electrolysis and catalytic oxidation treatment and ammonium chloride recovery. Compared with the prior art, the method and the device have the advantages that the free ammonia is recovered and utilized in a cycling manner, so that the consumption of ammonia is reduced; after the free ammonia is recovered, the consumption of neutralizing acid is reduced, the volume of the wastewater is reduced, and the load of the sewage treatment device is reduced; and by adopting the method and the device, the recovery ratio of ammonia and ammonium chloride can be adjusted randomly according to the market price of liquid ammonia and ammonium chloride.