Method for selecting smoke gas average flow rate measure point of desulfurized flue gas online monitoring system of coal-fired power plant
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An average velocity, coal-fired power plant technology, applied in average velocity measurement, measuring device, velocity/acceleration/shock measurement, etc., can solve problems such as instability, large centrifugal force, flow sampling and measurement difficulties, etc.
Active Publication Date: 2013-01-02
STATE GRID CORP OF CHINA +2
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[0004] The purpose of the present invention is to solve the problem that the sampling point of the desulfurization flue gas parameters in the existing coal-fired power plant is shifted to the horizontal flue at the chimney inlet mixing flue, because the air flow in the mixing flue generates a large centrifugal force, which is extremel
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specific Embodiment approach 1
[0125] Specific implementation mode one: combine Figure 1-Figure 3 To illustrate this embodiment, the specific steps of the method for selecting the average flow rate measuring point of flue gas in the coal-fired power plant desulfurization flue gas online monitoring system in this embodiment are:
[0126] Step 1. The grid method is used to determine the average flow velocity of the flue gas in the mixed flue, and the flow velocity V of the wet flue gas at the measuring point of the mixed flue s混 It can be obtained according to formula (1):
[0127]
[0128] Among them: K p is the standard Pitot tube correction coefficient, K p =1.0;P d混 is the dynamic pressure, Pa; ρ s混 is the density of wet flue gas in the mixed flue, kg / m 3 ,
[0129] The wet flue gas density ρ of the mixed flue in formula (1) s混 Calculate according to formula (2):
[0130]
[0131] where: ρ n混 is the density of wet smoke under standard conditions, kg / m 3 ; T s is the flue gas temperature,...
specific Embodiment approach 2
[0172] Specific implementation mode two: combination Figure 1-Figure 3 To illustrate this embodiment, the specific steps of the method for selecting the average flow rate measuring point of flue gas in the coal-fired power plant desulfurization flue gas online monitoring system in this embodiment are:
[0173] Step 1. Determine the average flow velocity of flue gas in the mixed flue,
[0174] Calculate the flue gas volume flow Q under the actual state of the outlet of the dust collector 1 ,
[0175] Q 1 = 3600 × F 1 × V 1 ‾ - - - ( 1 )
[0176] Where: F 1 is the cross-sectional area of the flue at the outlet of the dust collector, m 2 ; is the average flow velocity at the outlet of the dust collector, m / s, It c...
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Abstract
The invention discloses a method for selecting a smoke gas average flow rate measure point of a desulfurized flue gas online monitoring system of a coal-fired power plant, and relates to a method for selecting a flue gas flow rate measure point. Particularly, the invention relates to a method for selecting the smoke gas average flow rate measure point of the desulfurized flue gas online monitoring system of the coal-fired power plant, which is used for solving the problems that the fluctuation of flow value is big and the flow can not be sampled and metered easily as the large centrifugal force caused by the air flow in the mixed flue is extremely unstable and relatively complex when a sampling point of the desulfurized flue gas parameter of the existing coal-fired power plant is displaced to a level smoke flue of a mixed flue at the inlet of a chimney. The method of selecting the smoke gas average flow measure point particularly comprises the following steps: step one, determining the average flow rate of the smoke gas in the flue; step two, seeking for the average flow rate representing point from the mixed flue; step three, verifying the relative stability of the average flow rate representing point. According to the method, the smoke gas average flow rate measure point of the desulfurized flue gas online monitoring system of the coal-fired power plant is selected and the smoke gas online monitoring system can collect data conveniently.
Description
technical field [0001] The invention relates to a method for selecting a flue gas flow velocity measuring point, in particular to a method for selecting a flue gas average flow velocity measuring point for a coal-fired power plant desulfurization flue gas on-line monitoring system. Background technique [0002] In order to realize that the desulfurization efficiency of the coal-fired power plant meets the performance guarantee value in the performance test after the desulfurization device is put into operation, domestic equipment manufacturers usually design the net flue gas measurement point on the clean flue gas flue at the outlet of the desulfurization tower when designing sampling points. One is because there is a long enough straight-pipe flue before the sampling point, which can ensure that the flue gas monitoring system samples under a relatively stable air flow, reflecting the actual state of the flue gas; second, it can prevent the bypass flue baffle from If it is n...
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