RU2021561C1 - Chimney - Google Patents

Abstract

FIELD: combustion engineering. SUBSTANCE: chimney has gas discharging tube, ducts for hot and cold gases, manifold, and distributors with openings. Hot gases enter mixing chamber from gas duct and cold gases enter manifold and distributors and issue into the mixing chamber through the openings. EFFECT: improved design. 4 dwg

Description

 The invention relates to energy, in particular to a device for removing flue gases from power boilers.

 Known chimney (Richter LA Gas-air ducts of thermal power plants. M.: Energy, 1969, s.217), containing a gas outlet, ducts of "hot" and "cold" gases.

 The main disadvantage of the device is the significant uneven distribution of the temperature of the flue gases in the barrel, and as a result, a sharp decrease in the reliability and durability of the barrel.

 The closest technical solution is a device containing a gas outlet, gas ducts of "hot" and "cold" gases and a mixing chamber.

 The main disadvantage of the device is a decrease in the durability and reliability of the barrel due to the low quality of mixing.

 The purpose of the invention is to increase the reliability and durability of the barrel due to the intensification of mass transfer processes. This is achieved due to the fact that the chimney containing the exhaust pipe, the hot and cold gas flues and the mixing chamber, moreover, it is equipped with a collector and distributors connected to it, having along the holes forming a variable diameter and a pitch between them, while in each concrete section of the distributor, the condition S / d = const is satisfied, where S is the step between the holes; d is the diameter of the hole.

^-2/3;

=

;

=

; h = kd

sinβ или, используя уравнение неразрывности (G = ρ VF) получают
h = K

d sinβ, или после несложных преобразований

=

sinβ, так как для отдельных насадков по длине распределителя выполняются условия k = const,

= const,

= const , β = const, то для обеспечения

= const для отдельных насадков по длине распределителя должно выполняться условие S/d = const. Таким образом, если S/d = const для отдельных насадков по длине распределителя, то

=const и θ = const и если θ = 1,0 для одного насадка, то автоматически для всех. Отсюда следует, что условие S/d = const является необходимым и достаточным.It is known that the mixing quality in the transverse flow of jets is determined by the ratio
θ =

^-2/3 ;

=

;

=

; h = kd

sinβ or, using the continuity equation (G = ρ VF) get
h = K

d sinβ, or after simple transformations

=

sinβ, since for individual nozzles along the length of the distributor the conditions k = const are satisfied,

= const

= const, β = const, then to ensure

= const for individual nozzles along the length of the distributor, the condition S / d = const must be satisfied. Thus, if S / d = const for individual nozzles along the length of the distributor, then

= const and θ = const, and if θ = 1.0 for one nozzle, then automatically for all. It follows that the condition S / d = const is necessary and sufficient.

 An analysis of the scientific, technical and patent literature showed that well-known technical solutions having features similar to those of the prototype were not found.

 The proposed technical solution has significant differences.

 In FIG. 1 shows the proposed pipe, a longitudinal section; figure 2 - section aa in fig. 1; figure 3 - node I in figure 2; figure 4 - node II in figure 2.

 The smokestack contains a gas outlet shaft 1, a mixing chamber 2, gas ducts of “hot” and “cold” gases 4.3, a manifold 7, a distributor 5, along which aperture 6 is made. The diameter of the hole 6 and the pitch between the holes vary along the length of the distributor, but in each particular section, the condition S / d = const is satisfied.

 The device operates as follows.

 "Hot" flue gases from the flue 4 enter directly into the mixing chamber 2, and "cold" from the flue 3 to the collector 7, the distributor 5, and from there through the openings 6 to the mixing chamber 2, where they are effectively mixed and fed into the exhaust pipe 1. The uniform distribution of "cold gas" along the length of the distributor is provided, for example, by changing the diameter of the nozzle along the length of the distributor. However, to ensure uniform distribution of "cold" gas along the height of the mixing chamber, it is necessary to change the pitch. As shown above, the condition S / d = const guarantees θ = const.

= 0-0,80;

= 1.0 - 2.65;

= 0.01 - 0.10;

= 0.2 - 2.0, показал, что при S/d = const качество смешения максимально.The studies presented in the laboratory "Hydrogasdynamics" in a wide range of changes in geometric and operational parameters

= 0-0.80;

= 1.0 - 2.65;

= 0.01 - 0.10;

= 0.2 - 2.0, showed that at S / d = const the quality of mixing is maximum.

=

;

=

;

=

; d_э= d

;

=

где G - массовый расход; β - угол атаки; d - диаметр; S - шаг; μ - коэффициент расхода. Индексы: с - струя; Э - эквивалентный; п - поток; см - смесь.

=

;

=

;

=

; d _e = d

;

=

where G is the mass flow rate; β is the angle of attack; d is the diameter; S is the step; μ is the flow coefficient. Indices: s - stream; E - equivalent; n is the flow; cm is a mixture.

Claims (1)

A SMOKE PIPE containing a gas outlet trunk, hot and cold gas flues, a mixing chamber, characterized in that, in order to increase the reliability and durability of the barrel, it is equipped with a collector and distributors connected to it, having along the holes of variable diameter and pitch between them, at this condition is met in each particular section of the distributor
S / d = const,
where S is the pitch between the holes;
d is the diameter of the holes.

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