Steam issues in urea-based reductant denitration in SCR and SNCR – seeking help
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This post was last edited by slll611 on 2016-5-15 00:16. In the process using urea as a reducing agent, the urea dissolution tank needs to be heated with steam from the plant to dissolve the urea. What is the amount of heat required for the urea particles to be converted into a 50% urea solution? . . . . It is necessary to calculate the size of the steam pipes. Is there any expert to help? ?
The heat of solution is very small; the specific values are not known. You can calculate it based on the heat required to raise the temperature of water and urea from room temperature to the desired temperature
But if it goes from the room temperature at which urea dissolves to the designed temperature, less heat is required; however, a large amount of heat is needed for urea particles to dissolve in water, right{:3_62:}.
When calculating the designed steam consumption, it is necessary to take into account the heat required for dissolving the urea particles, the heat that needs to be absorbed to reach the designed temperature, as well as the heat that is lost normally. The total heat is the steam enthalpy value, which can then be converted using the heat transfer coefficient.
It is necessary to determine the size of the urea dissolution tank; calculate the heat required to heat the water, plus the heat absorbed during urea dissolution, taking heat losses into account. The heat exchange area is determined based on the steam parameters (pressure and temperature), in accordance with the specifications of the coiled tubes used in the design
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