45results about How to "Achieve denitrification" patented technology

The invention discloses a processing method of coking steaming ammonia wastewater. The processing method of the coking steaming ammonia wastewater comprises pretreatment of coking steaming ammonia wastewater and biochemical treatment of the coking ammonia wastewater. The pretreatment of the coking steaming ammonia wastewater uses an adjusting pool, an internal electrolysis reactor, a Fenton oxidation pond and a coagulative precipitation tank. A sequencing batch membrane bioreactor technology is adopted by the biochemical treatment, and working procedures of inflow, unused-leaving, reacting and discharging are sequentially performed according to a time period. The processing method of the coking steaming ammonia wastewater can effectively remove persistent organic pollutants and ammonia nitrogen, strengthen effluent quality, and reduce operational and investing costs of equipment.

This invention relates to a complex flow artificial marsh composed of a vertical flow artificial marsh unit at the top and a level flow gravel bed at the bottom to become an integral structure, which is a solid sewage zoology process system, the level flow gravel bed is under the vertical flow marsh unit to reduce occupied areas with exclusive nitrogen-removing effect, in which, TSS, BOD and TN in the sewage are removed effectively and processed water can be collected by collecting wells and used in pouring greenbelt in local areas, besides, rain flows can be stored in underground deposition tanks and processed and re-used by the complex flow artificial marsh to realize situ processing life sewage and rain flows.

The invention discloses a glass fiber coated filter material with a catalytic function and a preparation method thereof. The glass fiber coated filter material consists of a glass fiber filter material base material, a glass fiber protective film, a catalyst nano-particle layer and an expanded microporous polytetrafluoroethylene filter film. During application in filtering, dust is firstly blockedby the expanded microporous polytetrafluoroethylene filter film of the glass fiber coated filter material with the catalytic function, so that the active sites on catalyst nano-particles are prevented from being covered with the dust and thus losing activity, the catalytic function of the catalyst is efficient and can last for a long time, and residual harmful gas is decomposed by the catalyst nano-particle layer to achieve the purpose of comprehensive prevention and control of the dust and harmful gas. The integration of dust removal, desulfurization, denitration, dioxin removal, mercury removal and the like is achieved, and the filter material is particularly suitable for industrial production.

The present invention provides coupling multistage apparatus with active carbon to purify waste gas, and the apparatus is used in desulfurizing, denitrating, dedusting, eliminating heavy metal and eliminating organic compound of waste gas. It consists of pre-purifying room, movable adsorption bed, purified gas outlet, material feeding mechanism, and discharging mechanism. Each of the material feeding mechanism and the discharging mechanism consists of material bin, material guide pipe and gas trap valve. The movable adsorption bed consists of one or several adsorption sections superposed sequentially, the material feeding mechanism is set on the top, the discharging mechanism is set in the bottom, and the pre-purifying room and the purified gas outlet are set in the side. The apparatus has compact structure, simple material distribution, complete functions, less resistance, high purifying effect, fully use of active carbon, long service life and low running cost.

The invention discloses a composite ecological treatment method for intercepting farmland recession pollutants, relates to a farmland ecological treatment system, and provides an ecological ditch-plant pond-constructed wetland composite system for ecologically intercepting farmland recession pollutants and a construction method thereof. The method can relieve the continuous pressure of farmland recession on the natural water environment, overcome the technical defects of existing farmland recession treatment, effectively solve the problems that an artificial wetland purification system is single in function, the effluent quality cannot meet the specified requirements and the like, strengthen the removal effect on organic matter, nitrogen and phosphorus in water, reduce the occupied area ofthe wetland, reducing the wetland load, prevent wetland blockage, achieve the purposes of high efficiency and low consumption, and beautify the environmental landscape. The system is low in investment and operation cost, convenient to operate, free of electromechanical equipment and operation energy consumption and suitable for being applied to ecological interception treatment engineering of farmland returned water pollutants greatly affected by natural rainfall.

The invention provides a catalyst and a preparation method thereof, wherein the catalyst comprises the following compositions in percentage by mass: 20 to 60% of Fe2O3, 20 to 60% of MnO2, 9.7 to 30% of Mn2O3, and 6 to 30% of Mn3O4; and the method for preparing the catalyst comprises the following steps of: adding a polyethylene glycol aqueous solution into a bivalent manganese salt aqueous solution at a certain temperature, then adding potassium permanganates and a ferric salt aqueous solution into the obtained mixed solution; stirring the obtained mixture so as to obtain a precipitate; filtering the obtained object so as to obtain a solid as the precursor of the catalyst; drying and then roasting the solid; and crushing the obtained solid subjected to roasting into particles so as to obtain the catalyst. The catalyst and the preparation method provided by the invention have the advantages that by using the prepared catalyst, at a reaction temperature of 100 DEG C, the rate of conversion between NO in tail gas and NO2 can achieve 91%; the prepared catalyst is larger in specific surface area and pore volume, and high in catalytic oxidation efficiency; and the prepared catalyst has a low-temperature catalytic activity, and can be used in the removal of NO in low-temperature oxygen-containing exhaust emission sources without performing the removal at a high temperature and addingoxidants, thereby saving energy and reducing consumption and cost.

This invention discloses a method for treating wastewater by using integrated aerobic granular sludge membrane biological reactor. Said reactor comprises a reaction pond, in which are placed baffle plates (vertically placed plates and inclined placed plates). The above mentioned plates separate the reaction pond into a reaction zone and a settling zone. In the settling zone, on the side wall of reaction pond is equipped with an effluent outlet tube. In the lower middle part of reaction zone is equipped with an aerator. Above the aerator are placed membrane elements, which are then connected with effluent outlet tube and sucking pump. The operation procedures are: continuously feeding wastewater, feeding aerobic granular sludge into the biological reactor, controlling the temperature, proceeding the biological reaction. This invention has advantages of: simple treatment process, high treatment efficiency, stable operation, obtaining effluent water with the need requirement, long service life of membrane elements, low investment and energy-saving.

The invention discloses a sewage deep treatment method by using an oxygenation filter system. The method is implemented by establishing an oxygenation filter system, wherein the oxygenation filter system comprises a sewage deep treatment tank in which a filter layer is arranged. Domestic sewage is sufficiently oxygenated through an oxygenation device, and sent into the sewage deep treatment tank through a water inlet pump; the sewage flowing out of a water distributor passes through the filter layer from bottom to top; a porous sintered ceramic granule filter material with developed pore structure can provide an attachment space for microbial films; the growth of the microbial films can enhance the removal effect on COD (chemical oxygen demand) and ammonia nitrogen in the sewage; as the water flow ascends, the dissolved oxygen content in the sewage gradually decreases, and an anoxic layer is formed on the upper part of the filter layer, thereby implementing the denitrification action and lowering the total nitrogen content in water; and since the filter layer has favorable adsorption and entrapment actions, the (suspended sediment) SS content in the sewage is lowered. The oxygenation filter system is small in occupied area and simple to operate, does not need to clean the filter layer after shutdown, and provides favorable conditions for removing COD, ammonia nitrogen and TN (total nitrogen).

The invention relates to a new rural domestic sewage nitrogen and phosphorus removal purification system. The system includes rural domestic sewage householders, septic tanks in corresponding connection with rural domestic sewage householders' sewage pipes and a water outlet pipe connected to the septic tanks. Every rural domestic sewage householder is connected to a septic tank correspondingly, a purification tank is additionally disposed behind the septic tanks, all the septic tanks are in parallel connection, and are gathered and then connected to the purification tank, the purification tank is connected to the water outlet pipe, and the purification tank is equipped with a reflux pipeline connected to the septic tanks. The septic tanks and purification tank are employed to realize rural sewage treatment, and achieve a two-stage biological treatment effect. A high activated sludge concentration is maintained, the purification tank is free of blockage, collection and gathering of scattered household sewage for co-treatment can be realized, and the sewage treatment reaches the effect of first level A of total nitrogen and total phosphorus. Aerobic activated sludge particles are utilized for synchronous realization of nitrification and denitrification effects.

The embodiment of the invention discloses a coke oven combustion waste gas denitration system and method. The system comprises a reducing agent storage device and a reducing agent jetting device located inside a coke oven heat storage chamber and connected with the reducing agent storage device outside the coke oven heat storage chamber through a connecting pipeline, and a first stop valve is arranged on the connecting pipeline. Compared with the prior art, because different denitration technologies are adopted, a denitration catalytic device is not needed; according to the technical scheme, the construction investment is small, the operation cost is low and a small area of land is occupied.

The invention discloses a denitrifying bacterium capable of efficiently denitriding under the condition of low carbon-nitrogen ratio and an application thereof. The denitrifying bacterium disclosed by the invention is Bacillus sp. DN-LWX4 which can be used to remove nitrate nitrogen, the perseveration number of the Bacillus sp. DN-LWX4 in China General Microbiological Culture Collection Center is No. 8290. The Bacillus sp. DN-LWX4 disclosed by the invention can be completely denitrified by glucose, ethanol, acetic acid, sodium acetate and other carbon sources, the removal rate of NO3-N can reach 95% when the initial concentration of NO3-N is 110.13mg / L; the carbon-nitrogen ratio of 3:1 is sufficient to satisfy the conditions of the bacterial demand for a carbon source, and the nitrogen removal rate of nitrate is 99.52% when the initial NO3-N concentration is 110.13mg / L.

The invention relates to a method and device for treating waste gas of a TFT glass substrate kiln. The device comprises a cooling tank, a dust removal box, a combustion chamber and an SCR reaction unit which are sequentially communicated; a first discharging opening for discharging mixtures and boric oxides is formed in the bottom of the cooling tank; a first waste gas inlet, a first waste gas outlet and a cooling medium inlet are formed in the cooling tank, and the first waste gas outlet is communicated with the dust removal box; a dust removal device is arranged in the dust removal box; and an air inlet, a natural gas inlet and a reducing agent inlet are formed in the combustion chamber. The method comprises the steps of firstly, removing the boric oxides in the waste gas, secondly, removing particle matter in the waste gas, thirdly, adopting a combustion manner to remove parts of the nitric oxides, and fourthly, adopting a catalytic deoxidizing reaction to remove the nitric oxides, completing treatment of the waste gas of the TFT glass substrate kiln, and performing discharging after the environment-friendly standard is achieved. The operation steps are simple, and various forms of boron and nitrogen oxides in the waste gas of the kiln can be effectively removed.

The invention provides a baffling type ammonia removal, denitrification and aeration biological filter tank. The baffling type ammonia removal, denitrification and aeration biological filter tank mainly comprises a filter tank, wherein a water inlet is formed in the upper part of a left side wall of the filter tank, and a water outlet is formed in the upper part of a right side wall of the filtertank; the filter tank is internally provided with a plurality of baffling filtering units; each baffling filtering unit comprises a baffle plate, a supporting plate and a filling frame; a water distribution channel is formed between every the two baffling filtering units; a medicament supplementing device is arranged at the top of each water distribution channel; each medicament supplementing device is internally filled with an alkalinity medicament or a carbon source. The filter tank provided by the invention is scientific and reasonable in structure, can be used for supplementing the alkalinity or the carbon source, and has good ammonia removal and denitrification effects.

The invention relates to a low-temperature carbon-based combined desulfurization and denitrification flue gas system and a use method thereof. The system comprises a first reactor, a second reactor and a third reactor and the reactors have the same structures. Each one of the first reactor, the second reactor and the third reactor comprises a central carbon-based bed, left and right air distribution grilles and left and right gas collection tanks in the outer side. The carbon-based bed is filled with an activated carbon material. The system utilizes the three same reactors and has functions of fine desulfurization, denitration and regeneration. The fine desulfurization and denitratio processes are connected in series and are connected to the regeneration process in parallel and the processes are carried out simultaneously so that in-situ regeneration is really realized. The reactor comprises the central carbon-based bed, left and right air distribution grilles and left and right gas collection tanks. The bed has a large windward area so that uniform gas distribution in the work and regeneration processes is guaranteed and a floor space is reduced. The system further improves the desulfurization and denitrification performances of the activated carbon material.

The invention provides a flue gas concerted catalytic denitration and demercuration technology. The technology realizes simultaneous removal of NOx and Hg<0> without arranging a flue gas purifying device, so the reconstruction cost of present apparatuses is saved, and pollution to atmosphere is reduced, thereby the technology has strong industrial application values. The technology comprises the following steps: 1, injecting ammonia gas fully mixed with air to a boiler flue gas through the nozzle of an ammonia injection grating, fully mixing, and converting NOx in the flue gas into N2 under the action of an upper portion honeycomb Ce-Cu-V-W-TiO2 composite catalyst; 2, introducing treated flue gas obtained in step 2, and carrying out catalytic oxidation on a tiny amount of O2 and HCl and Hg<0> under the action of a lower portion honeycomb Ce-Cu-V-W-TiO2 composite catalyst to generate HgCl2; and 3, allowing a treated gas obtained in step 2 to enter the operating unit of a desulfurization tower, capturing gaseous divalent mercury having high solubility in water by a wet washing system to remove the gaseous divalent mercury, and treating sulfur-containing compounds in the flue gas to recover elemental sulfur.

The invention provides an ecological filter dam based on efficient in-situ interception of pollutants and application of the ecological filter dam, and belongs to the technical field of water environment treatment. The ecological filter dam sequentially comprises a dam front intercepting area, a front dam, a biological contact oxidation area and a rear dam in the water flow direction. The dam front intercepting area comprises an overwater trash holding buoy and a fishing net; the front dam is formed by stacking a plurality of ecological gabion single bodies, which are respectively filled withmedium and small-particle-size matrixes and large-particle-size matrixes in a staggered manner; an aeration system in the biological contact oxidation zone comprises an aeration pipe arranged at the bottom of the river channel and a microporous aeration disc attached to the aeration pipe; a filler supporting body is arranged above the aeration system, and biological filler is hung on the filler supporting body; the rear dam is formed by stacking a plurality of ecological gabion single bodies filled with matrixes with superfine particle sizes in a staggered mode. The ecological filter dam can effectively improve the removal capacity of the filter dam, the problem of dam body blockage is fundamentally solved, and the service life of the ecological filter dam is greatly prolonged. And meanwhile, the dam body adopts modular units, is easy to construct, can be replaced and disassembled in time, and is wide in applicability.

The invention discloses a denitration demisting device after wet desulfurization. The denitration demisting device comprises a cylinder, wherein an air inlet and an air outlet are respectively formed in the upper and lower ends of the cylinder; the device consists of a denitration part for performing denitration on flue gas subjected to the wet desulfurization, and a demisting part for demisting the flue gas subjected to the wet desulfurization; the denitration part for performing the denitration on the flue gas subjected to the wet desulfurization comprises a nozzle for spraying an oxidizing agent and an electrostatic channel; the demisting part for demisting the flue gas subjected to the wet desulfurization comprises an electrostatic channel through which wet flue gas does a spiral motion from top to bottom; an electrostatic channel is formed in the cylinder; a nozzle is arranged in the air inlet; the air inlet is mutually connected with the cylinder by virtue of a volute type air inlet pipe; the volute type air inlet pipe penetrates through the side wall of the cylinder and is communicated with the electrostatic channel; and the air outlet penetrates through the lower end surface of the cylinder and is communicated with the electrostatic channel.

The invention discloses an activated coke flue desulfurization and denitrification integrated treating system. The system mainly includes a desulfurization and denitrification integrated reactor, an ammonium hydroxide storage tank, an ammonia spraying and mixing tower, an ammonium hydroxide pump, a waste coke cabin and an induced draft fan. Original flue from a boiler enters a desulfurization module of the reactor through a desulfurization inlet of the desulfurization and denitrification integrated reactor, the flue is in contact with activated coke inside the reactor, SO2 in the flue is adsorbed by the activated coke inside the reactor to be removed, desulfurized flue enters the ammonia spraying and mixing tower to be fully mixed with ammonium hydroxide in the ammonium hydroxide storage tank and then enters a denitrification module of the reactor, NOx in the flue reacts with ammonia inside the reactor to be reduced into N2 through low-temperature catalysis of the activated coke, cleanflue obtained after desulfurization and denitrification is conveyed into a chimney through the induced draft fan to be discharged, and waste coke generated in the reactor is conveyed into the waste coke cabin. The activated coke flue desulfurization and denitrification integrated treating system has the advantages of being low in investment and running cost, simple in structure and reliable during running.

The invention discloses a combined device for deeply purifying tail water of an urban sewage treatment plant and an operation method, belonging to the technical field of sewage treatment. The device is composed of an intermittent aeration activated carbon biofilter and a three-dimensional S-shaped channel plant floating bed, wherein the intermittent aeration activated carbon biofilter successively comprises a water inlet tube, a biological activated carbon layer, a graded gracel layer, a water outlet tube, an aeration tube and the like from top to bottom; the three-dimensional S-shaped channel plant floating bed is composed of an upper layer of S-shaped channel and a lower layer of S-shaped channel; because the plant floating bed is made of buckle plates with holes, the plant floating bed is convenient to install and good for the growth of plant roots; the intermittent aeration activated carbon biofilter can be utilized to trap and decompose solid suspended matters and organic matters in tail water, and nutrient matters can be partially removed; and the three-dimensional S-shaped channel plant floating bed can further adsorb nutrient matters in the tail water. In the combined device, different filter materials and plant floating bed materials can be replaced according to the water quality characteristic of sewage and regeneration reuse requirements, and the combined device is flexible to operate and can purify various contaminated water bodies.

The invention provides a marsh gas factory tail gas processing system, which comprises an oxidation combustion device, a first waste heat recovery device, a desulfurization device, a second waste heatrecovery device, a denitration device and a third waste heat recovery device, wherein the oxidation combustion device, the first waste heat recovery device, the desulfurization device, the second waste heat recovery device, the denitration device and the third waste heat recovery device are connected in sequence. The service life of the ceramic fiber filter tube of the tail gas processing systemcan be as long as 7-10 years. Since the device system works at a high temperature during a section with nitrogen oxide and sulfur oxide, and therefore, equipment corrosion caused by condensation is avoided.

The invention relate to a novel powdery denitration catalyst and a preparation method thereof. The novel powdery denitration catalyst is characterized by being prepared from the components in percentage by weight: 5-30% of active components, 15-50% of an assistant and 20-80% of an additive, wherein the active components are an oxide of Fe and an oxide of Mn, the assistant is one or more of oxidesof Ce, La, Er, Si, Al, Ca and Ti, and Au or Pt, and the additive is a mixture of one or two of active carbon or urea and one or two of melamine or glucose. The roasted active components, assistant andadditive are fully mixed and ball-milled, and the novel powdery denitration catalyst is prepared. The novel powdery denitration catalyst is environmental friendly in component, NO<x> removal activitytemperature is high, the window is wide, and denitration can be effectively achieved within the temperature range of 700-1200 DEG C.

The invention relates to a novel biochemical disinfection integrated device, comprising an external fan, and a facultative zone, a self-aeration biological runner aerobic zone, an inclined plate settling zone and a disinfection function section which are sequentially connected, wherein the facultative zone is provided with partition plates; the facultative zone is divided into a plurality of zones by the partition plates, and diversion pipes are arranged among the zones; the self-aeration biological runner aerobic zone is provided with a self-aeration biological runner, bionic filler, particle filler, a bottom-perforated aerator pipe and an internal circulation pipeline; the inclined plate settling zone is provided with inclined plate filler, a three-phase separator, a stainless steel isolation net and an effluent weir trough; the disinfection function section is installed on a water outlet pipe. The novel biochemical disinfection integrated device solves the problem of a large boundary effect of bottom microporous aeration, has excellent sewage decontamination ability, and is simple and easy in system control operation, full in stirring of the particle filler and simple in structure of the disinfection function section.

The invention belongs to the technical field of catalyst processing, and particularly relates to a coal combustion catalyst with demercuration effects and a preparation method thereof. The invention particularly relates to the high-activity coal combustion catalyst and the preparation method thereof. The catalyst is prepared from the following raw material ingredients: a cerous nitrate solution, Al2O3, ferric nitrate, CuCl2, a yttrium nitrate solution, a gadolinium nitrate solution, MnO2, diatom ooze, hydrotalcite, palygorskite, calcium carbonate, loofah sponge, straw, corn stalks, chitosan, citric acid, hexahydrocresol, polyoxyethylene ether and a raising agent. The catalyst has high chemical stability; the activity can be maintained in a long time; the catalyst can be recovered to be repeatedly used; by using the catalyst, the combustion speed of fire coal can be effectively accelerated; the effects of denitration, sulfur fixation and demercuration can be achieved; the discharge quantity of smoke can be reduced; the environment pollution is reduced, and the application value is high.

The invention relates to a method for preparing a synergistic desulfurization and denitrification agent for a cement kiln by recycling hazardous waste and solid waste. The method comprises the following steps: (1) mixing a crushed waste SCR (Selective Catalytic Reduction) denitrification catalyst, electrolytic manganese residues and carbide slag according to a certain mass ratio; (2) carrying out coarse grinding on the mixed material; and (3) adding an auxiliary agent into the material subjected to coarse grinding according to a certain proportion, and performing fine grinding to obtain the desulfurization and denitrification agent. According to the invention, nitrogen oxide and sulfur dioxide in the cement kiln tail gas can be synergistically removed, the emission standard is met, escape ammonia generated by an SNCR system can be eliminated, and increasingly strict ammonia escape supervision requirements are met; dangerous waste and solid waste can be treated while the desulfurization and denitrification cost is reduced, and resource reutilization is performed to create an environment-friendly value. Dust and waste liquid are not additionally generated, the technological process is easy to operate, and equipment and land occupation are not newly added.

The invention relates to a sewage sludge treatment device. The sewage sludge treatment device comprises a concentrating device (1), a first heat exchanger (2), a second heat exchanger (3), an anaerobic digestion reactor (4), an aerobic digestion reactor (5) and a sludge dewatering device (6) which communicate with one another sequentially, wherein a medium inlet of a heat exchange tube 2a in the first heat exchanger communicates with a returned sludge outlet (5a) of the aerobic digestion reactor, an outlet of the heat exchange tube (2a) communicates with a returned sludge inlet (5b) of the aerobic digestion reactor, and an inlet of a distributing pipe (5e) of a spraying member (5d) at the upper part of an internal cavity of the aerobic digestion reactor (5) communicates with the outlet of the heat exchange tube (2a) in the first heat exchanger or is connected with and communicates with the middle section of a third tube element (9). The sewage sludge treatment device has the characteristics that the efficiency of removal of volatile suspended solids from sewage sludge can be increased, meanwhile, ammonia nitrogen is reduced, and the energy consumption is lowered.

A separating reacting pulverizer comprises a housing and a transmission device, the transmission device is arranged on the housing, a housing chamber is arranged in the housing, a vortex wheel is arranged in the housing chamber, the transmission device is connected with the vortex wheel, one end of the housing chamber is provided with a housing chamber inlet, and the other end of the housing chamber is provided with a housing chamber outlet. The separating reacting pulverizer is widely applicable to dust removal, desulfurization, denitrification, smoke removal, deodorization, vehicular and marine emission purification, lampblack suction, air purification, oil gas recycling, garbage treatment, nuclear waste treatment, powder separation, mineral separation, sea water desalination, wastewatertreatment, water purification, oil refining, oxygen production, reactors, boilers, combustors, pulverizing equipment and other fields, can provide deep purification for flue gas, can solve air pollution and water pollution, can eliminate haze, and allows water resource shortage, water pollution and environmental pollution to be thoroughly solved. The separating reacting pulverizer is suitable forproducing various powders, including nano powder, can provide low-temperature full combustion for fuels without producing nitric oxides, can provide intra-furnace dry desulfurization and dedusting, and allows a boiler to be completely green.

The invention discloses a flue gas denitrification system. The flue gas denitrification system comprises a boiler hearth, a pyrolysis mechanism, an SCR reactor, a pipeline system and an exhausting pressurizing mechanism, wherein the pyrolysis mechanism, the SCR reactor and the pipeline system are located outside the boiler hearth; one end of a flue gas pipeline is communicated to the boiler hearth, and the other end of the flue gas pipeline is communicated to a pyrolysis mechanism; one end of a hearth flue is communicated to the boiler hearth, and the other end of the hearth flue is communicated to the SCR reactor; an air outlet pipeline is communicated to a hearth flue through the flue gas pipeline; and the exhausting pressurizing mechanism is connected between the pyrolysis mechanism andthe SCR reactor and is communicated to the air outlet pipeline. The exhausting pressurizing mechanism is arranged at the lower end of the pyrolysis mechanism, and pressurized high-temperature flue gas is introduced into the SCR reactor, so that the flue gas denitrification is realized; and compared with the prior art, the flue gas denitrification system has the advantages that the defect of an over-high temperature of the exhausting pressurizing mechanism is improved, and the service life of the system is not influenced.

An embodiment of the invention discloses an ammonia spraying control system which comprises a boiling furnace, an ammonia water pump, an air compressor pump and a PLC (programmable logic controller) control unit. A high-pressure fan is mounted on the boiling furnace and connected with the PLC control unit through a furnace working feedback unit, an ammonia water pipe is connected at the output endof the ammonia water pump and connected with the boiling furnace through a uniform spraying structure, and a compressed air pipe is connected at the output end of the air compressor pump and connected with the ammonia water pipe. According to the ammonia spraying control system, ammonia water can be intelligently sprayed, an ammonia spraying device can be automatically started when the furnace isstarted, the ammonia spraying device can automatically stop when the furnace is pressed due to failure of a production line or other reasons, caking of slag in the boiling furnace is avoided, the ammonia water can be sprayed to various directions in the boiling furnace, and ammonia gas is more uniformly distributed in the boiling furnace. Besides, according to the system, the ammonia water cannotbe evaporated before entering the boiling furnace, and the influence of increasing of pressure in an ammonia spraying pipe on follow-up spraying of the ammonia water is avoided.

The invention provides a biological nitrogen removal system and a process thereof. The system comprises a primary anaerobic system, a primary anoxic system and a sedimentation system. The primary anaerobic system, the primary anoxic system and the sedimentation system are arranged and communicated in sequence; the primary anaerobic system is a tank body provided with a plug-flow stirring device; the primary anoxic system is a tank body provided with a plug-flow stirring device and an aeration device; the tank bodies of the primary anaerobic system and the primary anoxic system are connected; a separation wall is provided with an opening; the sedimentation system comprises a primary sedimentation tank and a secondary sedimentation tank; the top of primary sedimentation tank is provided with an overflow channel; the bottom of the secondary sedimentation tank is provided with a mud bucket; the upper part of the mud bucket is communicated to the primary sedimentation tank and is provided with an effluent overflow port; and the second sedimentation tank is provided with a baffle plate for preventing short flow. The biological nitrogen removal system can effectively realize interexchange of mud and water, realize synchronous nitrification and denitrification, effectively remove nitrogen-containing pollutants in wastewater and reduce cost. A production flow is compact and floor space can be saved.