24results about "Ammonium sulfites" patented technology

A process for stabilizing nutrients in anaerobic digestate involves removing hydrogen sulfide and ammonia from biogas. This process involves circulating the digestate in a column and contacting it with the biogas. Additional ammonium bisulfite, ammonia, and / or sulfur dioxide may be added to the contacting device to remove hydrogen sulfide from the biogas. The reactions will create ammonium bisulfite, ammonium sulfite, and ammonium thiosulfate to prevent ammonia and hydrogen sulfide emissions to allow for land application.

The invention belongs to the technical field of flue gas purification, and particularly relates to a method for removing SO2 and CO2 in flue gas, which comprises the following steps: S1, selecting HA-Ca and NH4Cl as raw materials, adding water, and fully stirring and fusing to obtain a mixture of CaCl2 and HA-NH4; s2, a mixture of CaCl2 and HA-NH4 is heated and decomposed, and a mixture of HA and CaCl2 and NH3 are obtained; s3, filtering the mixture of the HA and the CaCl2 to obtain an HA precipitate and a CaCl2 solution; s4, a CaCl2 solution is introduced into the NH3 obtained in the step S2 and the flue gas containing CO2, and a mixture of NH4Cl and CaCO3 is generated; s5, filtering the mixture of the NH4Cl and the CaCO3 to obtain a CaCO3 precipitate and a NH4Cl solution; s6, NH3 obtained in S2 is added into an absorption reaction device, SO2-containing flue gas and water are introduced, and (NH4) 2SO3 is generated through a reaction; s7, (NH4) 2SO3 is subjected to oxidation, and (NH4) 2SO4 is obtained; s8, (NH4) 2SO4 and HA in the S3 are mixed to be used as the humic acid organic compound fertilizer; the method has the advantages of efficient waste gas treatment capacity, low raw material cost, simple process flow and no secondary pollution.

The invention discloses a wastewater treatment method and system, and the treatment method comprises the following steps: carrying out first concentration crystallization treatment on wastewater to obtain a concentrated treatment solution, carrying out solid-liquid separation treatment on the concentrated treatment solution to obtain ammonium sulfate and a first mother solution, and monitoring the specific gravity of the first mother solution and the mass content of phosphorus in the first mother solution, the wastewater comprises NH4 < + >, SO4 < 2-> and PO4 < 3->; when the specific gravity of the first mother liquor and the mass content of the phosphorus element meet first preset values, carrying out second concentration and crystallization treatment on the first mother liquor to obtain ammonium dihydrogen phosphate and second mother liquor; when the specific gravity of the first mother liquor and the mass content of the phosphorus element do not meet the first preset value, mixing the first mother liquor with the wastewater, and then carrying out first concentration crystallization treatment. According to the treatment method, the impurity content in ammonium sulfate can be reduced, the added value of byproducts is improved, and the economic benefit of wastewater treatment is improved.

The present application relates to a high concentration of ammonium bisulfite preservation solution, the preservation solution components include ammonium bisulfite and ethanol, the concentration of ammonium bisulfite is about 13 mol / L to about 15 mol / L, the concentration of ethanol is about 0.3 mol / L to about 1.5 mol / L. The present application also provides a method and kit for preserving high concentration of ammonium bisulfite solution.

This invention discloses a system for producing ammonium sulfite using electrolytic manganese ammonium sulfate double salt. The system includes a drum high-temperature drying device. The electrolytic manganese ammonium sulfate mixture output from the drum high-temperature drying device is fed into a crushing device via an elevator. The electrolytic manganese ammonium sulfate mixture output from the crushing device is fed into an anaerobic calcining furnace. A three-stage electrostatic precipitator is connected to the rear end of the anaerobic calcining furnace. The exhaust gas, after dust removal by the three-stage electrostatic precipitator, is sent to a multi-stage absorption and conversion tower via an exhaust gas pipeline. The conversion liquid and the completed absorption liquid after passing through the multi-stage absorption and conversion tower are sent to an evaporation device. This system and method for producing ammonium sulfite using electrolytic manganese ammonium sulfate double salt improves the calcination effect through pretreatment such as drying and crushing, and ultimately converts the ammonium sulfate into sulfur dioxide through anaerobic calcination to prepare ammonium sulfite. The difference lies in the direct blending and calcination method used in domestic and international processes.

In a method for physical and thermochemical treatment of biomass, the biomass moisture content is reduced in a dryer and ammonia (NH3) is also released from the biomass during drying. The dried biomass is then either pyrolyzed in a pyrolysis reactor and the pyrolysis gas is forwarded to and combusted in a combustion device to form flue gas, or is combusted in a combustion facility unit to form flue gas. In either case the flue gas is fed to a mixer. Oxygen (O2) is metered to the flue gas in the mixer and is fed directly to the dryer as drying gas. As the drying gas passes through the dryer, the sulfur dioxide (SO2) contained in the drying gas and / or the sulfur trioxide (SO3) chemically reacts with the ammonia (NH3) to form ammonium sulfite ((NH4)2SO3) and / or ammonium sulfate ((NH4)2SO4). Also a treatment facility physically and thermochemically treats the biomass.

The present invention belongs to the technical field of flue gas purification, and particularly relates to a method for removing SO2 and CO2 from flue gas, comprising the following steps: S1: Using HA-Ca and NH4Cl as raw materials, fully stirring and mixing them with water to obtain a mixture of CaCl2 and HA-NH4; S2: Heating and decomposing the mixture of CaCl2 and HA-NH4 to obtain a mixture of HA and CaCl2, and NH3; S3: Filtering the mixture of HA and CaCl2 to obtain HA precipitate and CaCl2 solution; S4: Passing the NH3 obtained in S2 into the CaCl2 solution, and passing flue gas containing CO2 to generate a mixture of NH4Cl and CaCO3; S5: Filtering the mixture of NH4Cl and CaCO3 to obtain CaCO3 precipitate and NH4Cl solution; S6: Adding the NH3 obtained in S2 into the absorption reaction device, passing flue gas containing SO2 and water, and reacting to generate (NH4)2SO3; S7: Oxidizing (NH4)2SO3 to obtain (NH4)2SO4; S8: Mixing (NH4)2SO4 with HA in S3 and using it as a humic acid organic compound fertilizer; it has high-efficiency waste gas treatment capacity, low raw material cost, simple process flow, and no secondary pollution.

The invention belongs to the field of waste gas treatment, and particularly relates to a flue gas ammonia process desulfurization recovery method and system.The method comprises the steps that flue gas enters the bottom of a desulfurization tower, is evenly distributed through a first gas distribution brick layer and then continues to rise, the flue gas and desulfurization liquid sent by primary tail absorption liquid circulation are subjected to countercurrent removal, and most SO2 is removed; and then the flue gas is removed from the reverse flow of the desulfurization liquid circularly sent by the second-stage tail absorption liquid, and SO2 in the flue gas is further removed, so that the flue gas meets the standard requirement. And the desulfurized flue gas enters a second gas distribution brick layer to uniformly distribute the gas again, the uniformly distributed gas is washed, the entrained desulfurization liquid is removed, washing and cooling are performed, and finally the gas is discharged into the atmosphere. According to the method, ammonium sulfite is directly utilized, a drying and concentrating facility is omitted, an oxidation process is omitted, investment is reduced, and processes are reduced.

A control process and apparatus provide feed forward control of stoichiometric proportions of hydrogen sulfide and ammonia to a thermal oxidizer and an ammonia scrubber, respectively. To account for unmeasured or uncalculated sulfur feed to the thermal oxidizer, a feed back measurement of sulfur dioxide and ammonia concentration is used to correct the flow rate of hydrogen sulfide to the thermal oxidizer and / or ammonia to the ammonia scrubber.

A process for producing ammonium sulfite and ammonium bisulfite from an ammonia gas stream. The process involves injected sulfur dioxide into a circulating liquid stream to an optimal pH that captures gaseous ammonia from a gas stream. The captured ammonia reacts with sulfur dioxide and water to form the desired products.

The disclosure provides a method for manufacturing ammonia. The method comprises providing a metal nitride, a refrigerant fluid, a proton donating compound and optionally one or more of the following: nitrogen gas, a solvent, and an additive. The method also comprises combining the metal nitride, the refrigerant fluid, the proton donating compound and optionally the one or more of the 5 following: nitrogen gas, the solvent, and the additive whereby protonation of the metal nitride takes place to provide ammonia, a metal salt and / or metal hydroxide, and heat.

The invention relates to a method for the physical and thermochemical treatment of biomass (5), wherein the biomass (5) is reduced in its water content in a drying device (4) and additionally ammonia (NH3) is released from the biomass (5) during drying. Subsequently the dried biomass (5) is pyrolyzed in a pyrolysis reactor (2) and the pyrolysis gas is further conducted to a combustion device (3) and combusted there to flue gas, or combusted to flue gas in a combustion plant unit (17), which flue gas is introduced into a mixing device (9), respectively. In the mixing device (9) oxygen (O2) is metered into the flue gas and introduced as drying gas directly into the drying device (4). While the drying gas is conducted through the drying device (4), sulfur dioxide (SO2) and / or sulfur trioxide (SO3) contained in the drying gas chemically reacts with ammonia (NH3) to form ammonium sulfite ((NH4)2SO3) and / or ammonium sulfate ((NH4)2SO4). Additionally, the invention relates to a treatment device (1) for the physical and thermochemical treatment of biomass (5).

The present invention is based on the combined removal of hydrogen sulfide from a raw gas mixture and removal of ammonia from a waste liquid. The invention relates to a method for the combined removal of hydrogen sulfide from a raw gas mixture and removal of ammonia from a waste liquid. The invention also relates to a method for the production of ammonium sulfate.

The invention belongs to the technical field of environmental protection engineering, and provides a modular efficient integrated ground dust removal and desulfurization integrated system which comprises a modular skid base, an efficient bag-type dust remover, a rotational flow plate tower desulfurization device, an induced draft fan, a spraying system and a control system. All the units are integrated on the same base, and the flues are linearly connected through CFD optimization, so that the pressure loss is reduced; the control system constructs a triple closed loop of ammonia balance, water balance and concentration control, and dynamically regulates agent addition, liquid level and slurry discharge to ensure that sulfur dioxide and particulate matters at an outlet are lower than those at the outlet. The system is compact in structure, capable of being integrally hoisted, uniform in by-product ammonium sulfate crystal particle size and suitable for various industrial scenes.

A process for producing ammonium sulfite and ammonium bisulfite from an ammonia gas stream. The process involves injected sulfur dioxide into a circulating liquid stream to an optimal pH that captures gaseous ammonia from a gas stream. The captured ammonia reacts with sulfur dioxide and water to form the desired products.

The invention discloses a system and a method for producing ammonium sulfite by using electrolytic manganese ammonium sulfate double salt, which are characterized in that the calcination effect is improved through the pretreatment of drying, crushing and the like, and the ammonium sulfate is finally converted into sulfur dioxide through the calcination in an oxygen-free environment to prepare the ammonium sulfite. The difference is that a direct blending and calcining mode is adopted for treatment at home and abroad, but the method cannot be popularized and applied technically and economically, after ammonium sulfate in the ammonium sulfate double salt is decomposed, a high-value ammonium sulfite product can be produced by adopting the mode, and the method is high in technical feasibility and low in cost. And the residual high-manganese-content substance can be used for producing electrolytic manganese metal by an electrolytic manganese system, so that certain economic benefits can be generated, and huge environmental protection benefits and safety guarantee are achieved.

A control process and apparatus provide feed forward control of stoichiometric proportions of hydrogen sulfide and ammonia to a thermal oxidizer and an ammonia scrubber, respectively. To account for unmeasured or uncalculated sulfur feed to the thermal oxidizer, a feed back measurement of sulfur dioxide and ammonia concentration is used to correct the flow rate of hydrogen sulfide to the thermal oxidizer and / or ammonia to the ammonia scrubber.

The invention relates to a high-concentration ammonium hydrogen sulfite preserving fluid which comprises the following components: ammonium hydrogen sulfite and ethanol, the concentration of the ammonium hydrogen sulfite is about 13 mol / L to about 15 mol / L, and the concentration of the ethanol is about 0.3 mol / L to about 1.5 mol / L. The invention further provides a method and a kit for preserving the high-concentration ammonium bisulfite solution.

A process and apparatus for managing hydrogen sulfide in a refinery is provided. In the process, a hydrogen sulfide stream from said refinery is fed to a sulfur recovery unit to produce sulfur and a sulfur compound stream or to a thermal oxidizer. The sulfur compound stream and the hydrogen sulfide stream are then thermally oxidized to produce a sulfur oxide stream. The sulfur oxide stream is then reacted with an ammonia stream. In aspect, the product of the reaction can be a fertilizer. The ammonia stream can be obtained from stripping the hydrogen sulfide stream.

The invention discloses a point discharge plasma nitrogen fixation device and method based on plane medium assistance. The nitrogen fixation device comprises a plasma generator, a reactor and a gas system, the plasma generator is used for discharging, the gas system is used for providing reaction gas, the reactor is an electrolytic tank, an electrolyte is arranged in the electrolytic tank, the electrolyte is provided with a plane medium, and the plane medium is provided with a nitrogen source. The planar medium takes foamed nickel as a substrate, the surface of the foamed nickel is loaded with oxide and / or hydroxide, and the foamed nickel is completely wetted and placed at an electrolyte interface before reaction, so that the plasma discharge effect acts on foamed nickel pores. The design of the reaction system aims to improve the ionization degree of the gas by introducing the planar solid-phase medium, so that a stable micro-discharge environment is favorably formed at an interface by a discharge electric field, heat energy or ineffective current loss is reduced, and the nitrogen activation efficiency and the energy utilization rate are remarkably improved.

The application discloses a kind of gasification high flash gas and stripping gas combined production process for producing process, belong to novel coal gasification synthetic ammonia technical field, including saturated hot water tower, high-efficiency separator, stripping tower and spray tower, saturated hot water tower is connected with high-efficiency separator by high flash gas inlet pipe, high-efficiency separator is connected with high flash gas outlet pipe and full solid condensate pipe, full solid condensate pipe is communicated with saturated hot water tower, high flash gas outlet pipe is connected with stripping tower, stripping tower is connected with stripping gas outlet pipe and ammonia water pipe, stripping gas outlet pipe and ammonia water pipe are connected with spray tower, spray tower is connected with non-condensable gas outlet pipe, non-condensable gas outlet pipe is connected with sulfur recovery device.The application uses the above structure of a kind of gasification high flash gas and stripping gas combined production process, removes impurity in high flash gas, reduces the steam consumption in stripping process, energy saving and consumption reduction;Remove gas ammonia in stripping gas, solve the problem of poor quality of sulfuric acid, increase flue gas desulfurization device, improve economic benefit.

The application discloses a novel method and device for resource conversion of sulfur hexafluoride. The method comprises the following steps: firstly, performing primary discharge treatment on SF6 to dissociate SF6 into fluorine atoms and low-fluorine sulfides; secondly, performing fluorination reaction of the fluorine atoms and the low-fluorine sulfides with tungsten to convert the fluorine atoms and the low-fluorine sulfides into WF6 and reduce sulfur into elemental sulfur; thirdly, controlling the fluorination reaction temperature to be 120-160 DEG C to make the generated elemental sulfur into liquid state, so that the elemental sulfur is conveniently collected; fourthly, condensing mixed gas containing WF6, collecting the liquefied WF6, mixing the condensed mixed gas with water vapor, and performing secondary discharge treatment on the mixed gas containing water vapor; under the action of the water vapor, the mixed gas is further degraded, and the degradation products tend to be SO2 and HF; fifthly, separating the SO2 and the HF; sixthly, treating the HF by using a "hydrogen fluoride-liquid ammonia" liquid phase method to obtain ammonium fluoride and ammonium bifluoride; and seventhly, treating the SO2 by using a wet ammonia method to obtain ammonium sulfite and ammonium sulfate.

A control process and apparatus provide feed forward control of stoichiometric proportions of hydrogen sulfide and ammonia to a thermal oxidizer and an ammonia scrubber, respectively. To account for unmeasured or uncalculated sulfur feed to the thermal oxidizer, a feed back measurement of sulfur dioxide and ammonia concentration is used to correct the flow rate of hydrogen sulfide to the thermal oxidizer and / or ammonia to the ammonia scrubber.