233 results about "Nitrous oxide" patented technology

The embodiment of the invention discloses a water-gas interface greenhouse gas flux automatic monitoring system and a distribution prediction method. The system comprises a wind speed sensor and an air pressure and temperature sensor which are respectively used for collecting the wind speed of air at a monitoring point, the atmospheric pressure and the Kelvin air temperature; the infrared sensor is used for collecting the content of CO2, CH4 and N2O in the air of the monitoring point; the acidity sensor and the temperature sensor are respectively used for collecting the pH value and the centigrade water temperature of monitoring point water; the carbon dioxide sensor is used for collecting the concentration of bicarbonate in water at a monitoring point; the methane sensor and the nitrous oxide sensor are respectively used for collecting the contents of greenhouse gases CH4 and N2O dissolved in the monitoring point water; and the calculation module is used for calculating the flux of the greenhouse gas on the water-gas interface. According to the embodiment of the invention, the water-gas interface flux of various greenhouse gases under actual conditions can be accurately monitored.

The present invention discloses a method for assessing nitrogen emissions from farmland soil at a regional scale based on transfer learning, the method comprising: obtaining existing farmland soil nitrogen, nitric oxide and nitrous oxide data, and constructing an emission database; establishing a coupled domain adaptive and random forest regression model based on the data in the emission database; adjusting the parameters of the random forest model using farmland soil nitrogen emission observation data, and optimizing the random forest model; using the optimized model to perform global farmland emission prediction on farmland soil nitrogen data, and obtaining a regional scale farmland soil nitrogen emission assessment result. The present invention uses field measured data of nitrous oxide and nitric oxide, which have the same production pathway as nitrogen, to construct a random forest model, and based on transfer learning technology and ideas, uses limited nitrogen field observation data to calibrate the constructed model to meet the needs of large-scale assessment of farmland soil nitrogen emissions, thereby achieving farmland soil nitrogen emission assessment.

The present invention relates to a catalyst for low-temperature catalytic decomposition of nitrous oxide (N2O), a preparation method, an activation method and a use thereof. The catalyst of the present invention uses rare earth metal elements and alkaline earth metal elements as promoters to assist in dispersing the active components and optimizing their electronic structures. After being pretreated and activated by H2, the activity of N2O catalytic decomposition is stably promoted, and a low-temperature N2O decomposition catalyst with excellent catalytic performance is obtained. In the catalyst preparation method of the present invention, through the co-doping of rare earth elements and alkaline earth Ba elements, the electronic structure of the catalyst is optimized; then it is activated by H2 pretreatment to generate surface defects and adjust the interaction between the active components and the promoters, thereby significantly improving the catalyst activity on the premise of maintaining good catalyst life.

The invention relates to the technical field of biological denitrification, in particular to a nitrogen-doped carbon dot-based microbial electronic control denitrification system and application thereof. The system comprises electron donor microorganisms, electron acceptor microorganisms and nitrogen-doped carbon dots, the nitrogen-doped carbon dots serve as electron mediators outside cells, an efficient extracellular electron transfer network is constructed, and interspecific electron transfer resistance is reduced; meanwhile, the nitrogen-doped carbon dots can regulate and control intracellular electron transport chains and the energy metabolism process, the improvement of the reducing power and the energy level is promoted, and the metabolism mode optimization is realized. By cooperatively regulating and controlling generation, transmission and utilization of electrons under an extreme electron donor limited oligotrophic condition, the system disclosed by the invention can realize efficient denitrification, avoid nitrite accumulation, remarkably inhibit generation of nitrous oxide (N2O), reduce dependence on an external organic carbon source and an electron source, and improve the denitrification efficiency. And a new technical approach is provided for improving the deep denitrification efficiency under the low-carbon condition.

A rainwater garden including: a bioretention area; a rainwater collection area; and a first perforated drainage pipe. The bioretention area includes, from bottom up, a gravel layer, a transition layer, a chalcopyrite substrate layer, a biochar substrate layer, a planting layer, a cover layer, and a water storage layer. The first perforated drainage pipe is disposed in the gravel layer. The first perforated drainage pipe includes an outlet end extending to connect to the rainwater collection area; and the outlet end is flush with a top surface of the chalcopyrite substrate layer.

The invention provides a multi-department nitrous oxide emission accounting method and system based on multi-source heterogeneous big data. The method comprises the following steps: accounting nitrous oxide emissions of fuel combustion, industrial production, agricultural activity and waste treatment in a reference year; calculating the monthly nitrous oxide emission amount of a fuel combustion emission source in the target year, the monthly nitrous oxide emission amount of an industrial production emission source in the target year, the monthly nitrous oxide emission amount of an agricultural activity emission source in the target year and the monthly nitrous oxide emission amount of a waste treatment emission source in the target year; and adding to obtain the total nitrous oxide emission in the target year. The method has the advantages that emission source accounting methods discussed by the method are kept consistent, the accounting boundary is clear and definite, and the accounting result has accumulability and comparability; the method does not depend on traditional national statistical data, and overcomes the defects that previous data are not available, lagged, missing and the like; the method disclosed by the invention fully reveals the spatial-temporal heterogeneity of emission of different emission sources in a regional level.

The invention belongs to the technical field of soil improvement, and particularly relates to a modified porous composite material as well as a preparation method and application thereof. The composite material comprises modified ceramsite and microorganisms, the modified ceramsite comprises a ceramsite matrix and a calcium alginate gel layer; the ceramsite matrix has a porous structure; the calcium alginate gel layer is loaded on the surface and the interior of the ceramsite matrix, and the surface and the interior of the ceramsite matrix and the interior of the calcium alginate gel layer are coated with microorganisms by the calcium alginate gel layer. The composite material with a specific structure can improve microbial activity, has an obvious promotion effect on ferrous oxidation, and can effectively avoid degradation of organic carbon in soil, so that a stable carbon sequestration effect is achieved; meanwhile, generation of nitrous oxide in the process of iron-oxidizing bacterium ferrous oxidation coupling nitrate reduction can be effectively inhibited, greenhouse gas emission in the process of iron-oxidizing bacterium nitrate reduction coupling ferrous oxidation is reduced, the DOC concentration is reduced, and good carbon sequestration and emission reduction effects are achieved.

The invention provides a farmland net carbon emission prediction method, a farmland net carbon emission prediction system and a farmland net carbon emission prediction device. The farmland net carbon emission prediction method comprises the following steps: acquiring crop related data, nitrous oxide emission measured data, methane emission measured data and carbon sequestration efficiency measured data of different crops in different planting areas; constructing a nitrous oxide emission prediction model according to the crop related data and nitrous oxide emission measured data; constructing a methane emission prediction model according to the crop related data and the methane emission measured data; constructing a carbon sequestration efficiency prediction model according to the crop related data and the carbon sequestration efficiency measured data; calculating a methane emission predicted value, a nitrous oxide emission predicted value and a carbon sequestration efficiency predicted value; and calculating a net carbon emission predicted value according to the nitrous oxide emission predicted value, the methane emission predicted value, the carbon sequestration efficiency predicted value and a preset net carbon emission model. According to the invention, high-precision and regionalized prediction and evaluation of farmland net carbon emission can be realized.

The present application belongs to the technical field of solar cells, and specifically relates to a TOPCon solar cell and a preparation method therefor. In the present application, a tunnel oxide layer is deposited by means of a combination of PECVD and PEALD. A thin oxide layer with a thickness of 0.1-0.5 nm is pre-deposited by means of PECVD, wherein in a subsequent PEALD process, the thin oxide layer chemically passivates a surface of a substrate, and then the PEALD process is used to uniformly deposit a tunnel oxide layer on the basis of the oxide layer. The basic principle of such growth mode is atomic layer deposition, the uniformity of the oxide layer is good, and the influence of an airflow, temperature, electric field and radio frequency in a tube is relatively small; therefore, electroluminescence test defects such as dark spots caused by producing the tunnel oxide layer completely by means of nitrous oxide ionization can be avoided, and the influence of damage of plasma bombardment to the surface of a substrate can be reduced, thereby improving to a certain extent the conversion efficiency of the TOPCon solar cell.

This invention discloses a platinum-based catalyst, its preparation method, and its application in the catalytic combustion of methane. The preparation method includes reacting a catalyst supported on reduced platinum in a mixed atmosphere of methane / nitrous oxide or methane / nitrous oxide / inert gas at the lowest temperature required for the complete catalytic combustion of methane by nitrous oxide, yielding a catalyst supported on low-oxidation-state platinum. This invention achieves a breakthrough reduction in the temperature for complete methane conversion to below 200°C and maintains long-term stability. This invention enables the simultaneous degradation of two greenhouse gases, methane and nitrous oxide, which is beneficial for mitigating the greenhouse effect. The catalyst of this invention has a simple manufacturing process, excellent performance, and long lifespan, and can be widely used in equipment such as flue gas treatment, natural gas vehicle exhaust treatment, and air purifiers.

Disclosed is a waste gas treatment apparatus for semiconductor and display processes, the apparatus including: a pre-treatment unit having an inlet and an outlet formed therein, and configured to spray a cleaning solution to waste gas introduced through the inlet to primarily treat in the waste gas; a reaction unit configured to simultaneously treat fluorine compounds and nitrous oxide (N2O) in waste gas discharged from the pre-treatment unit; a post-treatment unit configured to spray a cleaning solution to waste gas discharged from the reaction unit to secondarily treat in the waste gas; and a heat exchange unit installed between the pre-treatment unit and the reaction unit.

The present application relates to the field of agricultural environmental protection method, particularly to a method for reducing the pollution of vegetable field soil non-point source and N2O.The method provided by the present application fully considers the carbon and nitrogen content, C / N and cellulose content of different exogenous carbon materials, reduces the application of chemical fertilizer nitrogen under the premise of ensuring the nitrogen supply of vegetables according to the nitrate nitrogen content of vegetable field soil, increases the amount of effective state carbon and the content of holocellulose by optimizing the combination and proportion of different exogenous carbon materials, improves the nitrate nitrogen assimilation of vegetable field soil, reduces the nitrogen leaching and soil N2O emission, and realizes the coordinated reduction and regulation of the pollution of vegetable field soil non-point source and N2O.The method is clear, simple, convenient, easy to implement.

The article of the present design (hereinafter referred to as the "Article") is a tank for a rocket engine for storing oxidizer or fuel for the rocket engine. When storing oxidizer in the Article, some oxidizers, such as nitrous oxide, generate high vapor pressure (up to 7 MPa) at room temperature, placing the tank under significant pressure. Therefore, the design must be carefully designed to ensure sufficient strength. The size of the Article is adjusted appropriately to match the size of the rocket engine, but it is generally expected that the tank will be used with an inner diameter ranging from approximately 10 cm to 50 cm. Furthermore, the Article is preferably made of metal, carbon material, or reinforced resin to withstand the pressure of the oxidizer or fuel. The Article is broadly composed of an outer shell 100, a fuel or oxidizer storage section 200, a columnar section 300, a rocket engine storage section 400, and a support section 500 (see Reference Figure 1). The support section 500 can be provided with appropriate bolt holes to function as a flange for securing the rocket engine. A rocket engine can be stored in the hollow portion inside the tank (storage portion 400 for the rocket engine). The total length of the rocket engine to be stored can be freely set, and can be the same as the total length of the hollow portion inside the tank of the present design, or it can be shorter or longer than the total length of the hollow portion. A flange 410 for fixing the rocket engine can be provided on the inside of the columnar portion 300 as needed, and by adjusting the attachment position of the flange 410 for fixing the rocket engine, rocket engines of various lengths can be fixed from above (see Reference Figure 2).

The ammonium nitrate recycling structure comprises a melting device and a reaction kettle, the melting device is connected with the reaction kettle through an ammonium nitrate delivery pump, a control valve is arranged between the ammonium nitrate delivery pump and the reaction kettle, and a cooling coil is arranged at a decomposed gas rising section in the reaction kettle. The liquid inlet end of the cooling coil pipe is connected with the melting device through an ammonium nitrate circulating pump, the liquid return end of the cooling coil pipe is connected back to the melting device, and an ammonium nitrate solution in the melting device is used as a cooling medium in the cooling coil pipe and exchanges heat with undecomposed ammonium nitrate steam rising along with nitrous oxide in the reaction kettle; the liquid drops formed after condensation return to the reaction kettle for continuous thermal decomposition, the utilization rate of ammonium nitrate is improved, meanwhile, the ammonium nitrate solution serving as a cooling medium in the cooling coil returns to the melting device after heat exchange and temperature rise, and the energy consumption of the melting device for preheating the ammonium nitrate solution is reduced.

The invention discloses preparation of a nickel and cerium doped cobalt-based catalyst and application of the nickel and cerium doped cobalt-based catalyst in catalytic decomposition of nitrous oxide. The nickel and cerium doped cobalt-based catalyst is of a Ni and Ce co-doped spinel type Co3O4 structure and has a mesoporous structure, and the molar ratio of cobalt to nickel to cerium is 1: 0.12: 0.04. The preparation method comprises the following steps: preparing a mixed solution in which the molar ratio of cobalt nitrate to nickel nitrate to cerium nitrate is 1: 0.12: 0.04 by adopting a coprecipitation method, adding sodium carbonate as a coprecipitator into the mixed solution, adjusting the pH value of the mixed solution to 9 while stirring, carrying out coprecipitation and aging, then washing and drying the precipitate, and roasting for 3 hours in an air atmosphere at 300-400 DEG C to obtain the nickel and cerium doped cobalt-based catalyst. The catalyst provided by the invention has good low-temperature nitrous oxide decomposition capability and anti-interference capability under complex working conditions.

The utility model discloses a nitrogen circulating and collecting device. Wherein the nitrous oxide monitoring chamber is hermetically mounted above the plant growth chamber; a space is defined between the nitrous oxide monitoring chamber and the plant growth chamber, a gas inlet and a gas outlet are formed in the nitrous oxide monitoring chamber, and the gas outlet is sequentially connected with a nitrous oxide sensor, a gas pump and the gas inlet through a gas pipeline to form a loop; and the lower end of the nitrous oxide monitoring chamber is integrally and fixedly connected with an annular fitting step. According to the utility model, the interference of man-made disturbance in the acquisition process can be reduced, and the accuracy and reliability of monitoring data are improved.

Aspects and embodiments relate to a therapeutic gas delivery system coupling, a therapeutic gas delivery system including such a coupling, and a method of coupling components of a therapeutic gas delivery system using such a coupling. According to various, but not necessarily all, embodiments there is provided: a therapeutic gas delivery system coupling comprising: an inlet coupleable to a therapeutic gas supply; a delivery outlet configured for delivery of therapeutic gas to a subject; a waste outlet coupleable to a gas extraction system; the coupling comprising a body portion having: a main cavity located between the inlet and the delivery outlet; and an ancillary cavity, located between the main cavity and the waste outlet; wherein: the main cavity and ancillary cavity are linked via an exhalation valve, the exhalation valve being moveable between: a closed position if a pressure differential between the ancillary cavity and the main cavity is greater than or substantially equal to zero, and an open position if a pressure differential between the ancillary cavity and the main cavity is less than zero; and wherein the ancillary cavity further comprises a waste valve, the waste valve being moveable between: an open position if a pressure differential between the ancillary cavity and ambient pressure is less than zero, and a closed position if a pressure differential between the ancillary cavity and ambient pressure is greater than or equal to zero. Arrangements in accordance with described approaches may improve the capture efficiency of exhaled gas, for example, exhaled gas containing nitrous oxide, during and between periods of active administration of therapeutic gases.

The invention relates to the technical field of sewage treatment, and discloses a system and a method for inhibiting nitrous oxide release in a sewage denitrification process, and the system comprises a water inlet unit, a denitrification reaction unit, a dissolved oxygen monitoring module, a central control unit, a gas collection unit and a performance evaluation module. The multi-point arrangement and encryption communication mode of the dissolved oxygen monitoring module improves the accuracy and safety of data acquisition, and the corrosion-resistant design of the gas collection unit and infrared absorption spectrometry detection ensure the reliability of gas analysis. The central control unit realizes the adaptive capability of the system through real-time monitoring and dynamic adjustment, and the performance evaluation module improves the long-term operation efficiency of the system through data analysis and optimization suggestion generation. According to the method, a dissolved oxygen dynamic balance regulation mechanism and a multi-parameter collaborative optimization strategy are introduced, and a real-time monitoring and feedback control technology is combined, so that the problem of generation of byproducts in the nitrification and denitrification process is solved, and the release amount of nitrous oxide is effectively reduced.

The application belongs to the field of catalysts, and provides an alkali metal modified catalyst for decomposing nitrous oxide and a preparation method and application thereof. The catalysts Co / x%K / ZrO2 and Co / y%K / z%Cs / ZrO2 provided by the application both have high activity, good tolerance to impurity gases (NO x , H2O, O2), and excellent catalytic decomposition capacity of N2O under low temperature conditions, and the latter has better comprehensive performance. It is proved that the method of the application is an important strategy for designing an efficient and high-selectivity catalyst system, and solves the problem that there is no cobalt-based catalyst with high efficiency for decomposing N2O while having good tolerance to impurity gases.

The invention discloses a cobalt-based catalyst for producing ammonia through catalytic oxidation of nitrous oxide and nitric oxide as well as a preparation method and application of the cobalt-based catalyst, and belongs to the technical field of catalysts and environmental pollution. The preparation method of the cobalt-based catalyst comprises the following steps: (1) mixing a cobalt source, a carbon-containing nitrogen compound, a precipitator and a solvent for reaction to obtain a precursor solution; (2) putting the precursor solution into a high-pressure reaction kettle for hydrothermal reaction to obtain a solid, namely a precursor; and (3) performing pyrolysis treatment on the precursor in an inert atmosphere to obtain the cobalt-based catalyst. The cobalt-based catalyst prepared by the invention is applied to electrocatalytic conversion from N2O to NH3 for the first time, and shows excellent catalytic activity.

The present application relates to a kind of purification method of nitric oxide gas, comprising the following steps: crude nitric oxide gas is imported into extraction column, and the extraction phase obtained after extraction is imported into resolution column for temperature resolution;Nitric oxide gas resolved is imported into ethanol absorption tower after alkali washing tower and condenser;Again imported into the adsorption tower filled with 13X molecular sieve;After adsorption, the gas is collected into product collection bottle, and the purity of more than 99.99% nitric oxide product is obtained.The present application uses ferrous sulfate solution as extractant, extracts refined nitric oxide, realizes the efficient extraction of nitric oxide by the coordination reaction of ferrous ion and nitric oxide in the purification process, then uses ethanol as absorbent, utilizes the significant difference in solubility of nitric oxide and nitrous oxide in ethanol, can selectively absorb the nitrous oxide impurity difficult to remove, finally uses 13X molecular sieve to further remove nitrous oxide, which is beneficial to reduce disproportionation reaction and improve product purity.

This invention discloses a quantitative method and system for the contribution of river nitrous oxide sources and fate processes, relating to the field of biotechnology. The method includes: collecting surface water and groundwater samples; determining the physicochemical properties of the water samples, including calculating and quantifying the water-to-groundwater exchange ratio; extracting dissolved nitrous oxide from the water samples after determining the physicochemical properties and performing isotope analysis on the nitrous oxide to generate isotope test results; conducting indoor culture experiments on the water samples after completing the isotope analysis to determine whether there are abiotic sources of nitrous oxide in the water samples, generating indoor culture results; and quantifying the contribution of river nitrous oxide sources based on the results of the water-to-groundwater exchange ratio, the isotope test results, and the indoor culture results. This invention effectively analyzes the sources and fate processes of nitrous oxide in rivers and accurately quantifies the contributions of different sources.

A method for purifying air through a pre-purification unit (PPU) of an air separation unit (ASU) system having a pre-PPU cooler located upstream of the PPU to cool the compressed air before it is sent to the PPU, the method may include the steps of passing air through an adsorber of the PPU to pass the air through a bed of adsorbent material within a vessel of the adsorber. In response to a determination that a problem exists with the pre-PPU cooler that causes the pre-PPU cooler to trip or require the pre-PPU cooler to be taken offline, the ASU system should continue to operate at full capacity even if nitrous oxide (N2O) in the air output of the PPU exceeds a first preselected threshold and is below a second preselected threshold associated with carbon dioxide (CO2) breakthrough. The ASU and PPU may be designed to implement embodiments of the method.

This application relates to the field of diesel engine exhaust gas treatment technology, and provides an aftertreatment system and a diesel engine. The aftertreatment system includes a first oxidation catalytic conversion module located downstream of the diesel engine's exhaust outlet; a particulate filter module located downstream of the first oxidation catalytic conversion module; a selective catalytic reduction module located downstream of the particulate filter module for reducing nitrogen oxides in the exhaust gas discharged from the particulate filter module; an ammonia oxidation catalytic module located downstream of the selective catalytic reduction module for oxidizing ammonia in the exhaust gas discharged from the selective catalytic reduction module; and a second oxidation catalytic conversion module located downstream of the ammonia oxidation catalytic module for decomposing nitrous oxide in the exhaust gas discharged from the ammonia oxidation catalytic module. Using this system can significantly improve exhaust gas treatment efficiency.

To clean components in semiconductor manufacturing equipment, such as an optical system or an electron beam system, a component is heated in a chamber. A supercritical fluid formulation is applied to the component in the chamber, which removes molecular and / or particulate contaminants. The supercritical fluid formulation can include one or more of carbon dioxide, water, HCF, alkane, alkene, nitrous oxide, methanol, ethanol, or acetone.

The article of the present design (hereinafter referred to as the "Article") is a tank for a rocket engine for storing oxidizer or fuel for the rocket engine. When storing oxidizer in the Article, some oxidizers, such as nitrous oxide, generate high vapor pressure (up to 7 MPa) at room temperature, placing the tank under significant pressure. Therefore, the design must be carefully designed to ensure sufficient strength. The size of the Article is adjusted appropriately to match the size of the rocket engine, but it is generally expected that the tank will be used with an inner diameter ranging from approximately 10 cm to 50 cm. Furthermore, the Article is preferably made of metal, carbon material, or reinforced resin to withstand the pressure of the oxidizer or fuel. The Article is broadly composed of an outer shell 100, a fuel or oxidizer storage section 200, a columnar section 300, a rocket engine storage section 400, and a support section 500 (see Reference Figure 1). The support section 500 can be provided with appropriate bolt holes to function as a flange for securing the rocket engine. A rocket engine can be stored in the hollow portion inside the tank (storage portion 400 for the rocket engine). The total length of the rocket engine to be stored can be freely set, and can be the same as the total length of the hollow portion inside the tank of the present design, or it can be shorter or longer than the total length of the hollow portion. A flange 410 for fixing the rocket engine can be provided on the inside of the columnar portion 300 as needed, and by adjusting the attachment position of the flange 410 for fixing the rocket engine, rocket engines of various lengths can be fixed from above (see Reference Figure 2).

Use of a gas hydrate for producing a frozen food foam product, wherein the gas comprises air and / or one or more of carbon dioxide, nitrogen, nitrous oxide, argon and oxygen, preferably the gas comprises carbon dioxide and / or nitrogen.

The embodiment of the invention discloses an automatic monitoring system and a distribution prediction method for greenhouse gas concentration in an inland water body. The system comprises an acidity sensor and a temperature sensor which are respectively used for collecting the pH value and the temperature of water at a monitoring point; the carbon dioxide sensor is used for collecting the concentration of bicarbonate in water at a monitoring point; the methane sensor and the nitrous oxide sensor are respectively used for collecting the contents of greenhouse gases CH4 and N2O dissolved in the monitoring point water; and the operator device is used for calculating the concentration of the greenhouse gas in the water according to the sensor data. According to the embodiment, the concentration of various greenhouse gases in the water body under the actual condition can be accurately monitored.

This invention provides an apparatus and method for recovering nitrous oxide from high-ammonia-nitrogen wastewater using algae-bacteria symbiotic technology. The apparatus includes an aerobic reaction unit and an anoxic reaction unit; the first outlet of the aerobic reaction unit and the inlet of the anoxic reaction unit are connected, and a monovalent anion exchange membrane is installed at the connection point; the aerobic reaction unit is connected to a first gas collection unit via a first gas outlet, and the anoxic reaction unit is connected to a second gas collection unit via a second gas outlet, for recovering nitrous oxide generated in both the aerobic and anoxic reaction units. This invention, by inoculating the aerobic reaction unit with algae-bacteria symbiotic sludge that achieves short-cut nitrification, effectively reduces the aeration energy consumption of short-cut nitrification through microalgae photosynthesis, realizes the recovery of nitrous oxide in the aerobic reaction unit, reduces the denitrification load in the anoxic reaction unit, increases the denitrification conversion rate, and reduces operating costs, embodying a high-efficiency, low-carbon, and environmentally friendly design concept.

To provide a boiler capable of suppressing generation of unburned substances such as carbon monoxide and soot and suppressing generation of dinitrogen monoxide during mixed combustion of hydrocarbon-based fuel as fuel of which combustion speed is higher than that of ammonia and ammonia fuel, and a control method for the boiler.SOLUTION: An ammonia mixed combustion boiler 1 as a boiler includes: a burner 20 to which at least either of first fuel F1 or ammonia fuel F2 and combustion air A1 are supplied; a damper 304; a combustion state detection section 44 that detects combustion of the first fuel F1 and mixed combustion of the first fuel and the ammonia fuel F2 distinctively; and a control section 40. The control section 40 includes a combustion control section that performs control so that an exhaust gas oxygen concentration becomes a first oxygen concentration when the combustion state detection section 44 detects single combustion of the first fuel F1, and that performs control so that the exhaust gas oxygen concentration becomes a second oxygen concentration lower than the first oxygen concentration when mixed combustion of the first fuel F1 and the ammonia fuel F2 is detected.SELECTED DRAWING: Figure 1