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Ring screw smoke flue for smoke tube built-in water tube of shell type smoke tube boiler

A technology of smoke tube boilers and threaded smoke tubes, which is applied to fire tube steam boilers, fixed tubular conduit components, steam boilers, etc., can solve the problems of low heat transfer efficiency, environmental pollution, and large energy consumption, and achieve improved transmission efficiency. Thermal efficiency, small footprint, and the effect of reducing the flow cross-sectional area

Inactive Publication Date: 2010-02-24
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problems of low heat transfer efficiency, large volume, high cost, high energy consumption and serious environmental pollution of existing industrial shell-type smoke-tube boilers, the present invention provides an industrial shell-type smoke-tube boiler smoke tube The cross-section of the built-in water pipe is a circular threaded flue. The specific technical solution to solve the above problems is as follows:

Method used

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  • Ring screw smoke flue for smoke tube built-in water tube of shell type smoke tube boiler
  • Ring screw smoke flue for smoke tube built-in water tube of shell type smoke tube boiler
  • Ring screw smoke flue for smoke tube built-in water tube of shell type smoke tube boiler

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specific Embodiment approach 1

[0008] Specific Embodiment 1: This embodiment is composed of a drum 6, a threaded smoke pipe 5, and a threaded water pipe 4 axially arranged at the axis of the threaded smoke pipe 5. An annular smoke pipe is formed between the threaded smoke pipe 5 and the wall of the threaded water pipe 4. Air channel, the water channel is formed in the pipe of the threaded water pipe 4, the threaded smoke pipe 5 is arranged in the drum 6, the water inlet at the right end of the threaded water pipe 4 is connected with the right header 11, and the water outlet at the left end of the threaded water pipe 4 is connected with the left header 3 connected.

[0009] The threaded smoke pipe 5 adopts a threaded pipe whose outer diameter is Φ89 or Φ108mm, and the threaded water pipe 4 adopts a threaded pipe whose outer diameter is Φ32 or Φ38mm.

[0010] The flue gas forms a swirling flue gas channel under the action of the internal thread of the threaded smoke pipe, which significantly improves the flue...

specific Embodiment approach 2

[0011] Embodiment 2: The threaded smoke pipe 5 of this embodiment is welded on the tube plates at both ends of the drum 6 .

[0012] The working process of the boiler is as follows:

[0013] The loose coal is placed in the coal hopper 1, scattered on the fire grate, and enters in the lower furnace 19 along with the rotation of the fire grate. The coal on the grate is burned by the heat from the furnace flue gas and the heat radiated from the furnace arch, and the air entering the air chamber 22. The smoke from coal combustion flows into the upper furnace 17 from the lower furnace 19, and is cooled by the water in the furnace. The wall 15 and the part of the drum exposed in the upper furnace transfer heat and enter the flue gas chamber 2, and the flue gas swirls in the annular flue gas channel formed between the threaded smoke pipe 5 and the threaded water pipe 4 wall, so that the flue gas swirls Significantly improved, thereby strengthening the lateral scour of the pipe wall,...

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Abstract

It is about the ring screw thread smoke channel of the boiler shell type gas tube in the boiler field. It solves the low heat transmission efficiency, big size, high cost, energy costly and pollutantfeature of the boiler's smoke tube. It is made of screw thread water pipe (4) along the shaft at the axial center of the screw thread smoke tube (5), with the inner pipe of the screw thread smoke pipe (5) and the outside pipe of the screw thread water pipe (4) sharing a tube wall. The screw thread smoke tube (5) is set inside the boiler, the water inlet of the right end of the screw thread waterpipe (4) connects with the right header (11), and water outlet of the left screw thread water pipe connects with the left header. It speeds up the stirring and mixing of the swirling boundary layer ofthe smokes to improve the heat conductivity of smokes. The water pipe set inside the smoke pipe (5) increases the heat transmission area, cooling down the exhaust temperature. The water pipe (4) of the smoke pipe (5) reduces the flowing section of the smoke channel, speeds up the smoke flow, improving the heat transmission performance and efficiency.

Description

technical field [0001] The invention relates to the field of boilers. Background technique [0002] Industrial boiler is an important thermal power equipment in our country, it is widely used and in great demand. By 2003, the number of industrial boilers in use nationwide was 527,400 units and 1,254,000 MW, nearly twice the installed capacity of power plant boilers. At present, industrial shell-type smoke tube boilers mainly use threaded smoke tubes to enhance the heat transfer of the smoke tubes. However, the thermal efficiency of industrial boilers is still not high, and the average operating efficiency is only 60% to 65%, which is 10 to 20 percentage points lower than similar foreign products, resulting in serious waste of energy, and the volume is large and the cost is high; at the same time, the smoke and dust of industrial boilers Emissions are one of the main sources of air pollution in my country. Contents of the invention [0003] In order to solve the problems ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F22B9/00F24H1/14F28D7/14
Inventor 赵云华何玉荣陆慧林王淑彦刘文铁
Owner HARBIN INST OF TECH
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