RU2068971C1 - Smoke stack - Google Patents

Abstract

FIELD: power engineering; devices for discharge of flue gases from power-generating boilers. SUBSTANCE: smoke stack has gas discharge channel 1, mixing chamber 2, hot and cold gas ducts and header 5. Flue gases flow from slots to distributors 6 through gas ducts and header and then they enter mixing chamber 2. Mechanism 8 is provided for motion of distributors. EFFECT: enhanced efficiency. 2 dwg

Description

 The invention relates to energy, in particular to devices for the removal of flue gases from energy boilers.

 Known chimney containing a gas outlet, flues, a mixing chamber located between the barrel and flues [1] This pipe is the closest analogue to the proposed one.

 The disadvantage of this device is the decrease in the efficiency of gas mixing when the operating mode deviates from the nominal one and, as a result, the uneven distribution of temperatures in the exhaust pipe and a decrease in its durability increase.

 The technical task of the invention is to increase the reliability and durability of the pipe while diverting gas flows with a significant temperature difference.

 The problem is solved in that a chimney containing a gas outlet barrel, flues, a mixing chamber located between the barrel and flues, is provided with an annular collector arranged around the mixing chamber and connected to one of the flues with radially arranged and arranged to move along its axis distributors with with slots in the area of the collector, with one end of each distributor outside the collector and plugged, and the second introduced into the mixing chamber.

 In FIG. 1 shows a diagram of a device; in FIG. 2, section A in FIG. 1.

 The smokestack contains a gas outlet shaft 1, a mixing chamber 2, gas ducts 3, 4, a manifold 5, comprising distributors 6 mounted along the radius and provided with slots 7 in the collector area. The distributors 6 are mounted with the possibility of axial movement using the mechanism 8. The position of the distributor is determined by the mechanism for fixing the movement 9.

 The operation of the device is as follows.

 Two gas streams with different temperatures enter the mixing chamber 2. One directly from the gas duct 3, the other from the gas duct 4 to the manifold 5, and through the slots 7 to the distributors 6 and then to the mixing chamber 2, where the flows are effectively mixed in the nominal mode. When changing the operating mode, the mixing quality decreases. To ensure a high value of mixing quality in variable modes, it is provided that the distributors move along their own axis, which is carried out by mechanism 8, and the position of the distributor is determined by the movement fixing mechanism 9.

где h высота механического экрана (распределителя), погруженная в проточную часть,
θ параметр качества,
A характерный размер потока,
K коэффициент
d диаметр отверстия
V скорость
r плотность
h глубина проникновения.It is known that with transverse flow of jets, the mixing efficiency is limited by convective heat and mass transfer and can be determined by the relation

where h is the height of the mechanical screen (distributor), immersed in the flow part,
θ quality parameter
A characteristic flow size,
K coefficient
d hole diameter
V speed
r density
h penetration depth.

Indices: 2 frontier limit
3 restriction on convective mass transfer.

with a jet, see mixture,
S in the plane of the trajectory, the jet.

и при неизменном положении распределителя (b const) меняется

и, как следствие, уменьшается качество смешения θ. Для того, чтобы вернуть значение качества смешения (например q 1,0) в данном устройстве при изменении режима работы и, следовательно, h_s предлагается память"b" таким образом, чтобы величина

сохранялась неизменной. Очевидно, в этом случае значение θ также сохраняется неизменным. В данном изобретении изменение "b" предлагается осуществлять за счет перемещения распределителя вдоль собственной оси, т.е. по радиусу трубопровода.Thus, when you change the operating mode of the device changes

and at a constant position of the distributor (b const) changes

and, as a consequence, the mixing quality θ decreases. In order to return the value of the mixing quality (for example, q 1.0) in this device when changing the operating mode and, therefore, h _s , the memory "b" is proposed so that the value

remained unchanged. Obviously, in this case, the value of θ also remains unchanged. In the present invention, it is proposed to change “b” by moving the distributor along its own axis, i.e. along the radius of the pipeline.

0,0078 0,0627,

0,196 0,784, b 0 - 0,60
показали, что при неизменном значении b изменение G приводит к изменению качества смешения от 1 до нуля,
изменение величины

позволяет получить высокое качество смешения в широком диапазоне изменения режима работы устройства (G var). Здесь

где G массовый расход
d диаметр
b высота механического экрана
μ коэффициент расхода
Индексы: c струя, э эквивалентный, п поток, о отверстия. ЫЫЫ1Studies conducted in a wide range of changes in geometric and operational parameters:
G 0 0.80,

0.0078 0.0627,

0.196 0.784, b 0 - 0.60
showed that at a constant value of b, a change in G leads to a change in the quality of mixing from 1 to zero,
change in magnitude

allows you to get high quality mixing in a wide range of changes in the operating mode of the device (G var). Here

where G is mass flow
d diameter
b height of the mechanical screen
μ flow coefficient
Indices: c stream, e equivalent, n stream, o holes. YYY1

Claims (1)

 A chimney containing a gas outlet trunk, flues, a mixing chamber located between the barrel and flues, characterized in that it is provided with an annular collector arranged around the mixing chamber and connected to one of the flues with radially arranged and movable spreaders along its axis with slots in the collector area, with one end of each distributor outside the collector and loaded, and the other introduced into the mixing chamber.

Images