Yara International

The present disclosure provides a method for measuring the biuret content of an aqueous solution comprising urea, one or more ammonium salts, free ammonia, and biuret, the method comprises: passing a first aqueous solution comprising urea, one or more ammonium salts, free ammonia, and biuret, through an ion exchange column comprising acid groups with a pKa ranging from 3.0 to 5.0, thereby obtaining a second aqueous solution comprising urea, one or more ammonium salts, and biuret and depleted in ammonia; analyzing the second aqueous solution in a system comprising a high-performance liquid chromatography device, thereby measuring the biuret content of the second aqueous solution; and processing the biuret content of the second aqueous solution, thereby obtaining the biuret content of the first aqueous solution.

The present disclosure relates to a horizontally oriented gas handling equipment of a chemical production plant, comprising a bottom with a lowest part, and being configured to receive a gas which comprises solid particles, wherein, during operation, the solid particles at least partially are carried over from the gas phase to a condensate phase, and comprising a drain arrangement located in the lowest part of the bottom of the gas handling equipment, which comprises a drain nozzle comprising an drain opening, and a drain pipe which is in liquid communication with the drain nozzle, the drain opening being configured to drain the condensate out of the gas handling equipment towards the drain pipe, and wherein a collar which at least partially surrounds the drain opening and comprises one or more collar drain openings which are located in a side of the collar opposite to the flow direction of the incoming gas in the gas handling equipment, at least part of the solid particles of the condensate being stopped by the collar, thereby obtaining a remaining part of the condensate with a reduced amount of solid particles which will flow towards the one or more collar drain openings, and subsequently in the nozzle opening and finally in the drain pipe. The present disclosure further relates to a nitric acid production plant comprising an ammonia oxidizer, an absorption tower, and horizontally oriented gas handling equipment. The present disclosure finally relates to a method for handling a gas with solid particles in a horizontally oriented gas handling equipment of a chemical production plant.

The present disclosure relates to a gas handling equipment of a chemical production plant, comprising a bottom with a lowest part, and being configured to receive a gas which comprises solid particles, wherein, during operation, the solid particles at least partially are carried over from the gas phase to a condensate phase, and comprising a drain arrangement located in the lowest part of the bottom of the gas handling equipment, which comprises a drain nozzle comprising an drain opening, and a drain pipe which is in liquid communication with the drain nozzle, the drain opening being configured to drain the condensate out of the gas handling equipment towards the drain pipe, and wherein one or more floating ball liquid traps are installed downstream the one or more drain arrangements, each floating ball trap being configured to evacuate the condensate out of one or more of the drain pipes when condensate is present in the drain pipe of the respective drain arrangement(s). The present disclosure further relates to a nitric acid production plant comprising an ammonia oxidizer, an absorption tower, and gas handling equipment. The present disclosure finally relates to a method for handling a gas in a gas handling equipment of a chemical production plant.

The present disclosure relates to a heat exchange arrangement comprising one or more shell and tube heat exchangers having a shell with an inner space, the heat exchanger having a tube-side inlet which enters a tube-side fluid to be heated or cooled in a front head located in between the tube-side inlet and a front tube sheet, from which the tube-side fluid then is distributed to a plurality of tubes which are held in place by tube sheets, and through which the tube-side fluid moves and during the movement is cooled or heated by a first shell-side heating or cooling fluid which moves through a first compartment with a first compartment inlet and a first compartment outlet, and by a second shell-side heating or cooling fluid which moves through a second compartment with a second compartment inlet and a second compartment outlet, whereafter the cooled or heated tube-side fluid is collected in a rear head located between a rear tube sheet and a tube-side outlet through which the cooled process gas leaves the heat exchanger, the tubes further being supported by a first and a second intermediate tube sheet placed between the front tube sheet and the rear tube sheet and between which a buffer compartment is formed with a buffer fluid with a buffer fluid temperature, the buffer fluid not chemically reacting producing insoluble compounds that precipitate as scale and not comprising compounds that chemically react with the shell resulting in corrosion at the buffer fluid temperature, and having a pressure which is higher than the higher one of the pressure of the first shell-side fluid in the first compartment and the second shell-side fluid in the second compartment.

The present disclosure relates to a method and a system to increase the dissolved oxygen content in a water body having a dissolved oxygen content of between 0 mg/l and 4 mg/l, or to anticipate a future drop of a dissolved oxygen content of a water body to between 0 mg/l and 4 mg/l, wherein the water body is non-stratified, or is stratified and comprises at least an epilimnion, wherein the method comprises a step a, wherein a stream of diluted aqueous nitrate containing liquid droplets of which at least part are diluted oxygenated aqueous nitrate containing liquid droplets are formed, and a subsequent step b, wherein the diluted aqueous nitrate containing liquid droplets of which at least part are oxygenated diluted aqueous nitrate containing liquid droplets are further spread, in case of a non-stratified water body, in a part of the water body or in the whole water body, and in case of a stratified water body, in a part of the epilimnion of the water body or in the whole epilimnion of the water body.

A burner basket assembly of an ammonia oxidation reactor, wherein the burner basket assembly comprises a burner basket inner side wall, a gas-permeable bottom plate, wherein between the burner basket inner side wall and the bottom plate a circumferential radial clearance is present, an L-shaped clearance cover profile which comprises a horizontal and a vertical clearance cover plate, wherein the horizontal and the vertical clearance cover plate are mechanically fixed to each other, wherein the vertical clearance cover plate comprises a window opening, and wherein the L-shaped cover profile during operation is displaceable in a vertical direction in view of the burner basket inner side wall, and at least one key-lock system which comprises a lock which is connected to the burner basket inner side wall, which extends through the window opening in the vertical clearance cover plate, and which comprises at least one lock opening, and a key which has at least a vertical pin with a certain pin length, wherein the lock opening is configured to allow insertion of the pin in the lock opening, and at the same time is configured to limit movement of the pin in view of the lock opening to such an extent that radial movement of the vertical clearance plate in view of the burner basket inner side wall is restricted.

The present disclosure provides a pressure control valve (1), in particular for use in a urea-producing plant. The present disclosure also provides a urea-producing plant comprising one or more pressure control valves (1), and the use of a pressure control valve (1) in a urea-producing plant. The pressure control valve (1) comprises a first body part (2) and a second body part (3) fluidically connected to each other through a valve seat (8), wherein the first body part (2) comprises an inlet (4) and a flow-regulating component, the movement of which regulates the volume flow rate of fluid flowing from the first body part (2) to the second body part (3); the second body part (3) comprises an outlet (5); the first body part (2) and the second body part (3) are made from the same first material; wherein the valve seat (8) has a cylindrical shape and circular walls and comprises an inner region (10) and an outer region (9), and wherein the outer region (9) is made from a second material, the inner region (10) is made from a third material, and the second material has a lower hardness than the third material.

The present disclosure relates to a computer-implemented method for anomaly ranking of an industrial asset, wherein the method comprises receiving operational data from a plurality of sensors coupled to an industrial asset; processing the operational data to determine a deviation amount, wherein determining a deviation amount comprises determining a difference between a sensor output value and a sensor limit threshold value; defining at least two anomaly events for the at least one sensor comprising a sensor output value outside a predetermined sensor limit threshold value and ranking the at least two anomaly events, wherein ranking an anomaly event comprises: processing the operational data to determine a deviation duration, wherein determining a deviation duration comprises determining the time when the plurality of sensor output values lie outside the sensor limit threshold value; determining a severity factor for each anomaly event based on the deviation amount and deviation duration; determining a priority factor of each anomaly based on the severity factor; outputting the at least two ranked anomaly events on a user terminal based on the priority factor.

The present invention relates to a computer-implemented method and system for determining an agricultural product related gas emission in a geographical area, wherein the method comprises determining a geographical area, receiving soil and weather data for the determined geographical area, receiving agricultural product data, wherein receiving agricultural product data comprises receiving an agricultural product composition and an agricultural product amount, wherein determining an emission amount further comprises, generating a grid with a plurality of grid cells over the determined area, and determining for a plurality of grid cells: a soil profile, a volumetric soil water content, a water filled pore space value based on the volumetric soil water content and the soil profile, an emission factor based on the water filled pore space, an agricultural product amount, an emission amount of an agricultural product related gas based on the emission factor and the agricultural product distribution, and the method further comprising generating an emission amount of the agricultural product related gas for the determined area based on the determined emission amount for at least a portion of the grid cells.

System for detecting overflow of a fluid in a storage tank (15) comprising an an inlet pipe (14) configured to receive the fluid from a delivery station (11) and in communication with the storage tank (15); an outlet pipe (16) in communication with the storage tank (15) and configured to release vapours and excess fluid rising from the storage tank; and an electric level switch (17) mounted on the outlet pipe (16) and connected to a line (18A), the line (18A) configured to receive vapours and the excess fluid from the outlet pipe and particularly configured for transferring the vapours and excess fluid to a scrubbing reservoir (19A). The electric level switch (17) comprises a central body (34) including a plurality of sensors (34a, 34b) disposed at its centre and is adapted to receive or detect the excess fluid rising in the outlet pipe. The present disclosure further provides a method for detecting overflow of a fluid in a storage tank and the use of the system to perform the method of present disclosure.