SU964355A2

SU964355A2 - Air heater with loose intermediate heat transfer agent

Info

Publication number: SU964355A2
Application number: SU813254588A
Authority: SU
Inventors: Манус Соломонович Шкляр; Марк Наумович Гойхман; Надежда Константиновна Корнева
Original assignee: Всесоюзный Научно-Исследовательский И Проектный Институт Вторичных Цветных Металлов
Priority date: 1981-03-02
Filing date: 1981-03-02
Publication date: 1982-10-07

Description

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Изобретение относитс к теплообменной технике и моует быть использовано в тештоиспользующих установках, например промьшшенных печах.The invention relates to heat exchange technology and can be used in test installations, such as industrial furnaces.

Известен воздухоподогреватель с сыпучим промежуточным теплоносителем, перемещаемым под дейстаием силы т жести, содержащий верхнюю и 1ШЖШОЮ камеры, снабженные натрубка ми подвода и отвода греющего газа и воздуха, в первой из которых размещен теплообменник, а в другой - объединенные попг1рно жалюзийные решетки, образующие каналы дл сыпучего теплоносител , подсоединенные к бункеру и подъемнику 1. A known air heater with a flowable intermediate heat carrier, moved under the force of gravity, contains an upper chamber and a single chamber, equipped with fittings for supplying and discharging heating gas and air, in the first of which a heat exchanger is placed, and in the other - combined populum louvre lattices forming channels for bulk coolant connected to the hopper and lift 1.

Недостатком известного воздухоподогревател вл етс низка зксштуатационна надежность , св занна с загр знением частицами пыли, содержащимис в греющем газе, поверхности труб и промежуточного теплоносител .A disadvantage of the known air preheater is the low operational safety associated with the contamination of dust particles contained in the heating gas, the surface of the pipes and the intermediate heat carrier.

По основному авт. св. V 666387 известен воздухоподогреватель с а гаучим промежуточным теплоносителем, перемещаемым под действием силы т жести, содержащий:верхнюю и нижнюю камеры, снабжешше патрубками подвода и отвода греющего газа и воздуха, в первой из которых размещен теплообменник, а в другой - объединешп 1е попарно жалюзийные решетки, образующие каналы дл сыпучего теплоносител подсоединенные к бункеру Н подъемнику, причем теплообменник выполнен в виде симметрично расположенных секций, одна из полостей каждой из которых подключена к патрубкам подвода и отвода воздуха, а друга - к патрубку подвода греющего газа и соединена через газоход, расположенный между секци ми, с каналами нижней камеры, подсоединенньпии к патрубкам отвода греющего газа 2.According to the main author. St. V 666387 is well-known with an air heater with a gauchy intermediate coolant, moved under the action of gravity, containing: upper and lower chambers, supplied with connections for supplying and discharging heating gas and air, in the first of which a heat exchanger is placed, and in the other - a combi-1e pairwise louvre forming channels for the heat-transfer fluid connected to the hopper H lift, and the heat exchanger is made in the form of symmetrically arranged sections, one of the cavities of each of which is connected to the inlet pipes air outlet, and the other - to the pipe supplying the heating gas and is connected through a flue located between the sections, with the chamber channels, nozzles podsoedinennpii to the heating gas outlet 2.

Недостатком зтого воздухоподогревател вл етс сравнительно низка эффективность теплообмена между греющим газом и воздухом , что обусловлено участием в теплообмене только слоев воздуха, расположенных у стенок труб.The disadvantage of this air preheater is the relatively low efficiency of heat exchange between the heating gas and air, which is due to the participation in the heat exchange only of air layers located at the pipe walls.

Цель изобретени - интенсификаци теплообмена .The purpose of the invention is to intensify heat transfer.

Поставле ша цель достигаетс тем, что внутри Каждой трубы теплообменника соосноThe goal is achieved by the fact that inside each heat exchanger tube is coaxially

установлена с образованием кольцевого зазора дополнительна труба с продольной прорезью, обращенной вниз и -упом нутые кольцевые зазоры заполнены ниже верхних образующих внутренних труб сыпучим теплоносителем.An additional pipe is installed with the formation of an annular gap with a longitudinal slit facing downward and the aforementioned annular gaps are filled below the upper forming internal pipes with a flowing heat carrier.

На фиг. I представлен воздухоподогреватель продольный разрез; на фиг. 2 - то же, поперечный разрез; на фиг. 3 - труба теплообменника , сечение.FIG. I presents an air heater longitudinal section; in fig. 2 - the same, cross section; in fig. 3 - heat exchanger tube, cross section.

Claims

The air heater contains the top 1 and bottom 2 chambers, equipped with nozzles 3 inlets and 4 exhaust gas gases and nozzles 5 inlets and 6 outlet heated air, respectively. In chamber 1 there is a heat exchanger 7, and in s chamber 2 there are louvered lattice 8 combined in pairs, forming channels for a bulk heat transfer fluid connected to bunker 9 and lift 10. Heat exchanger 7 is made in the form of symmetrically arranged sections II, one of the cavities of each of which is connected to the inlet 5 and the 6 outlet of heated air, and the other to the heating gas inlet 3 and connected through a duct 12 located between sections 11 with channels of the lower chamber 2 connected to the outlet 6 of the heating gas. Inside each pipe 13 of the heat exchanger 7 coaxially installed with the formation of an annular gap 14 an additional pipe 15 with a longitudinal slot 16 facing down and the annular gaps 14 are filled below the upper forming internal pipes 15 with a free-flowing coolant 17. A filter 18 is installed between the hopper 9 and the elevator 10, and the bunker 9 is provided at the bottom with a distributor 19. The air preheater operates in the following manner. The heating gas through the nozzles 3 is supplied to the chamber 1 and transfers its heat to the heat exchanger 7 and the intermediate heat carrier, which comes from the bunker 9 through the distributor 19. The heat carrier intensifies the heat transfer from the gas to the heat exchanger 7 and simultaneously cleans its surface. Next, the heating gas from the chamber: 1 enters the duct 12, passes through the louvered grilles 8 and is discharged through the nozzles 4. In the layer of friable coolant, the heating gas is filtered, leaving particles of dust. The intermediate heat carrier j with dust particles enters the lift 10 and then into the filter 18, from where it is sent to the hopper 9. Air is supplied to the pipes 13 of the heat exchanger 7 through the pipe 5 into the pipes 15, passes through the slot 16 into the gap 14, passes through a layer of friable coolant 17 and is discharged through the pipe 6. With the air movement described above, its intensive heat exchange with the walls of the pipes 13 is created. The application of the proposed air preheater will allow to intensify the heat exchange. . The invention of the air heater with a free-flowing intermediate coolant according to the author. St. No. 666387, characterized in that, in order to intensify heat exchange, an additional tube is coaxially installed inside each heat exchanger tube to form an annular gap, an additional tube with a longitudinal slit facing down, and said annular gaps are filled below the upper forming internal tubes with a friable coolant. Sources of information- taken into account in the examination 1. USSR author's certificate number 322567, cl. F 23 L 15/02, 1970.

2. USSR author's certificate number 666387, cl. F 23 L 15/02, 1979.

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