6results about How to "Reduce ammonia consumption" patented technology

The invention relates to a recovery system for copper in tin stripping wastewater by using waste ammonia water and a use method thereof.The recovery system comprises a tin deposition reaction tank, a first filter pressing system, a first-stage copper deposition system, a second-stage copper deposition system and an ammonium nitrate storage tank, the whole system introduces a waste ammonia water storage tank and a connecting pipeline thereof, the collected waste ammonia water is used as a raw material, and the waste ammonia water is recycled. According to the invention, the copper-containing sludge is used as a raw material and participates in the first-stage copper deposition step of the tin-stripping wastewater process, the original industrial ammonia water is replaced as the raw material, the ammonia consumption during the production of the copper-containing sludge can be greatly reduced, the copper deposition effect and the back-end production are not influenced, the use demand of the industrial ammonia water can be reduced, and the production cost can also be reduced.

The invention discloses an ammonia-process dump leaching method for copper sulphide ore, which comprises the following steps: treating the copper sulphide ore by adopting a dump leaching mode at a leaching agent temperature of-10-4 DEG C, taking an ammonium salt solution as a leaching agent, controlling the total ammonia concentration of the leaching agent to be 0.5-5mol / L and the pH range to be 7.5-9.5, adding the leaching agent into the copper sulphide ore by adopting a dripping leaching mode, and the copper-containing leachate is extracted and then returned to the leaching process, and ammonia and the ammonia leaching accelerant in the copper-containing leachate are recycled. The temperature of the leaching agent is controlled to be-10-4 DEG C for leaching, the ammonia consumption in the ammonia leaching process can be remarkably reduced, the leaching efficiency of copper under the low-temperature condition can be improved by adding the ammonia leaching accelerant, meanwhile, the copper-containing leachate is returned to the leaching process after being extracted, ammonia and the ammonia leaching accelerant in the copper-containing leachate are recycled, the purpose of effectively leaching chalcopyrite under the low ammonia consumption is achieved, and the method is suitable for large-scale industrial production. And a new technology is provided for development and utilization of low-grade primary copper sulphide ore in alpine regions.

The utility model provides a kind of coal pulverizer coal dust initial temperature promotion device, it is related to the technical field of coal-fired unit, including the flue between denitration device and air preheater and the flue gas inlet of coal pulverizer are communicated to the first pipeline leading out between them, high-temperature dust collector and temperature rising fan are sequentially provided on the first pipeline along the flow direction of flue gas;Flue between induced draft fan and chimney and the flue of first pipeline and second pipeline between high-temperature dust collector and temperature rising fan are converged;Valve group is arranged on the first pipeline and second pipeline;Valve group electric signal is connected with temperature control unit, for calculating the drying output demand temperature of coal pulverizer, solve the existing preprocessing easy to return moisture and technical problem of backflow abrasion equipment, reach the technical effect that internal flue gas of system is used to provide heat for coal pulverizer, while saving energy, reducing coal pulverizer explosiveness, improve low load condition boiler combustion state, improve boiler efficiency.

The invention discloses a dry denitration method and device for low-flue-gas-flow high-concentration NOx flue gas, and the method comprises the following steps: introducing flue gas into a pipeline, arranging a reserved catalyst layer at the initial end of the pipeline, arranging multiple stages of catalyst layers in the pipeline at the rear end of the reserved catalyst layer, arranging ammonia spraying grids on the reserved catalyst layer and the multiple stages of catalyst layers, and spraying ammonia on the ammonia spraying grids. Heat exchangers are arranged at the rear ends of other catalyst layers except the last stage; when the flue gas enters the pipeline, the flue gas is heated to a reaction temperature at the inlet of the pipeline, ammonia gas is sprayed out through the ammonia spraying grid, so that the flue gas and the ammonia gas are subjected to a multi-stage reaction under the action of a catalyst when passing through the reserved catalyst layer and the multi-stage catalyst layer, and during the period, the heat exchanger is used for heat exchange and temperature control to maintain each stage of reaction temperature at the reaction temperature, so that denitration is realized. The method has the characteristics of high denitration efficiency, low ammonia consumption, simple equipment, controllable system temperature, no wastewater generation and the like.

The invention relates to the technical field of kiln flue gas denitration, and discloses a kiln flue gas ultralow temperature denitration system and method.The method comprises the steps that S1, flue gas data and equipment data are collected and subjected to time alignment, and a synchronous data sequence is obtained; s2, calculating a derivation quantity and a comprehensive change trend quantity according to the synchronous data sequence, and constructing a process feature sequence; s3, establishing a control prediction model to output a control response result, constructing a reaction characterization quantity according to the process feature sequence, constructing a controllability characterization quantity according to the control response result, and generating a denitration reaction state estimation quantity; and S4, calculating an ammonia spraying control quantity and a temperature adjustment control quantity according to the denitration reaction state estimation quantity, applying a change rate constraint according to the controllability characterization quantity, and issuing and executing the ammonia spraying control quantity and the temperature adjustment control quantity. According to the method, self-adaptive distribution of ammonia spraying and temperature adjustment can be achieved under complex working conditions, adjustment oscillation is reduced, and the continuity and reliability of denitration operation are improved.

The invention discloses a method and equipment for cyclic utilization of ammonia gas for stable solidification of electrolytic manganese residues, and relates to the technical field of electrolytic manganese residues, the equipment comprises a washing tower, an ammonia water pipeline is communicated with an acid leaching pool, an ammonia water pipeline valve is fixedly communicated with the ammonia water pipeline, one end of a conveying pipe is fixedly communicated with a spraying pipe, and the other end of the conveying pipe is fixedly communicated with an acid leaching pool. The bottom of the spray pipe is fixedly communicated with a spray head, a cooling heat exchange device is arranged in the washing tower, a gas-liquid separation device is fixedly mounted at the upper position in the washing tower, and a filler layer is arranged below the spray head in the washing tower. Ammonia in tail gas generated in the stable solidification process of the electrolytic manganese residues is collected through ammonia collecting equipment to prepare ammonia water, then the obtained ammonia water is introduced into an acid leaching pool in the electrolytic manganese residue process, and pH is adjusted to remove Fe < 3 + > in leachate. The method can effectively reduce ammonia consumption, improve the operation environment of the electrolytic manganese residue stable curing site, create economic benefits and facilitate use.