Fluent-based method for arranging selective non-catalytic reduction (SNCR) spray gun on circulating fluidized bed boiler

A circulating fluidized bed and spray gun technology, applied in the field of circulating fluidized bed SNCR, can solve the problems of ignoring combustion reaction and ignoring chemical reaction

Inactive Publication Date: 2014-11-19
ZHEJIANG TIANLAN ENVIRONMENTAL PROTECTION TECH
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Problems solved by technology

Simplification shortens the simulation calculation time, but because chemical reactions

Method used

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  • Fluent-based method for arranging selective non-catalytic reduction (SNCR) spray gun on circulating fluidized bed boiler
  • Fluent-based method for arranging selective non-catalytic reduction (SNCR) spray gun on circulating fluidized bed boiler
  • Fluent-based method for arranging selective non-catalytic reduction (SNCR) spray gun on circulating fluidized bed boiler

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[0035] The present invention will now be explained in detail in conjunction with the embodiments and the drawings of the specification.

[0036] Such as Figure 5 As shown, the steps of an embodiment of the present invention are as follows:

[0037] Step 1. Import the physical model of the circulating fluidized bed boiler into the fluent, the physical model including the furnace, flue and separator connected in sequence.

[0038] The physical model is pre-established, such as figure 1 As shown, the established physical model includes three calculation areas, which are sequentially connected to the furnace, furnace outlet flue, and cyclone separator (separator), and each calculation area is divided into grids. The flue at the outlet of the furnace is the place where spray guns are usually arranged, and the gas velocity is also relatively high. For the accuracy of calculation, the grid is finer, and the number of divisions is 2,800,000 to 3,200,000.

[0039] Step 2: Set boundary conditi...

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Abstract

The invention discloses a fluent-based method for arranging a selective non-catalytic reduction (SNCR) spray gun on a circulating fluidized bed boiler. The method comprises the steps of 1, introducing a physical model of the circulating fluidized bed boiler into fluent; 2, setting the boundary conditions in the physical model, and carrying out numerical simulation to obtain the temperature and the velocity field of flue gas from a hearth to a separator; arranging the SNCR spray gun at the position where the temperature and the velocity field meet the first condition; 3, calculating the mixing effect of a reducing agent in a flue according to the position of the SNCR spray gun; 4, judging whether the mixing effect meets the second condition of the arrangement of the spray gun or not; if not, continuously adjusting until the position of the SNCR spray gun is determined; and 5, according to the determined position of the SNCR spray gun, arranging the SNCR spray gun at the position corresponding to the circulating fluidized bed boiler. The chemical reaction and the combustion reaction of the reducing agent in the flue are considered by the method, so that the denitration effect of the circulating fluidized bed boiler can be improved.

Description

technical field [0001] The invention relates to circulating fluidized bed SNCR technology, in particular to an SNCR spray gun method for setting circulating fluidized bed boilers based on fluent. Background technique [0002] SNCR technology is to spray the reducing agent containing amino group into the furnace, generally in the high temperature area of ​​900 ~ 1100 ℃ and NO x Oxidation-reduction reaction occurs to remove NO x the goal of. This method takes the boiler furnace or flue as the reactor, which can be realized through the transformation of the boiler, the transformation period is short, and the engineering difficulty is small. The reducing agent of SNCR is generally ammonia, ammonia water or urea. [0003] A typical SNCR process system is mainly composed of reductant storage, delivery and injection devices, including reductant storage tanks, delivery pumps, pipelines, injectors and related control systems, as well as NO x Online monitoring system. Among them,...

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Application Information

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IPC IPC(8): B01D53/79B01D53/56
Inventor 王岳军杨黎莫建松刘学炎吴忠标
Owner ZHEJIANG TIANLAN ENVIRONMENTAL PROTECTION TECH
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