Steam-air preheater controlling emission concentration of dioxin

An air preheater and emission concentration technology, applied in lighting and heating equipment, combustion methods, combustion types, etc., can solve problems such as easy generation of dioxins, decreased heat exchange efficiency, excessive dioxin concentration, etc., and achieve structural Simple, convenient control, and the effect of lower emission concentration

Inactive Publication Date: 2019-03-15
上海双木散热器制造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, as the heat exchange proceeds, the temperature of the steam in the tube bundle will gradually decrease, which greatly reduces the heat exchange efficiency.
In addition, when the temperature in the furnace is lower than 850°C, dioxins are easily produced when the chlorine-containing waste is burned, resulting in excessive dioxin concentrations in the exhaust gas.

Method used

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  • Steam-air preheater controlling emission concentration of dioxin

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0027] Such as figure 1 As shown, the steam-air preheater for controlling dioxin emission concentration includes a shell 12 , a first tube bundle 2 , a second tube bundle 4 , a temperature sensor 11 and a control cabinet 10 .

[0028] The housing 12 is hollow. The left end of the housing 12 is an air inlet, and the right end is an air outlet. Gas enters from the left end of the housing 12 and is discharged from the right end of the housing 12 . refer to figure 1 , the left end of the housing 12 is the air inlet pipe 1, and the right end is the air outlet pipe 5, the air inlet pipe 1 and the air outlet pipe 5 are respectively reducing pipes, wherein the air inlet pipe 1 becomes larger from left to right, and the outlet pipe 5 becomes larger. The air duct 5 becomes bigger successively from right to left. Further, the air inlet pipe 1 and the air outlet pipe 5 may have a symmetrical structure.

[0029] The cross section of the housing 12 can be square or circular.

[0030] Bo...

no. 2 example

[0043] The difference from the first embodiment is that there are two first tube bundles 2 .

[0044] Such as figure 1 As shown, the two first tube bundles 2 are respectively located on the left side of the second tube bundle 4 , and the two first tube bundles 2 are arranged along the axial direction of the casing 12 . Those skilled in the art can understand that the two first tube bundles 2 are internally connected, so that the steam passes through the two first tube bundles 2 in sequence to exchange heat for the gas passing through the casing 12 .

[0045]Each first tube bundle 2 has a pipe for discharging condensed water, and each pipe is provided with a first outlet valve group 7 for adjusting the amount of condensed water discharge, and the two pipes are finally connected to the first condensed water tank connect.

[0046] An inspection section 3 is arranged between the two first tube bundles 2 .

[0047] To sum up, by increasing the number of the first tube bundles 2 ...

no. 3 example

[0049] The difference from the first embodiment is that there are two second tube bundles 4 .

[0050] Such as figure 1 As shown, the two second tube bundles 4 are respectively located on the right side of the first tube bundle 2 , and the two second tube bundles 4 are arranged along the axial direction of the casing 12 . The two second tube bundles 4 are connected internally, so that steam can pass through the two second tube bundles 4 in sequence to exchange heat with the gas passing through the shell 12 .

[0051] An inspection section 3 is arranged between the two second tube bundles 4 .

[0052] To sum up, by increasing the number of the second tube bundle 4, the contact area between the second tube bundle 4 and the housing 12 is increased, that is, the contact area between the steam passing through the second tube bundle 4 and the gas passing through the housing 12 is increased, effectively improving the heat exchange efficiency , to avoid a large number of dioxins.

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Abstract

The invention discloses a steam-air preheater controlling the emission concentration of dioxin. The steam-air preheater comprises a casing, a first tube bundle, a second tube bundle, a temperature sensor and a control cabinet. The two ends of the casing are provided with an air inlet and an air outlet correspondingly. The first tube bundle is mounted on the casing, is adjacent to the air inlet ofthe casing and is used for heating gas passing through the casing. The second tube bundle is mounted on the casing, is adjacent to the air outlet of the casing and is used for heating gas passing through the casing. The temperature sensor is mounted on the casing and used for detecting the temperature of gas passing through the casing. The control cabinet controls the steam consumption of the first tube bundle and / or the second tube bundle according to the gas temperature detected by the temperature sensor, so that the effect that the temperature of the gas passing through the casing is always850 DEG C or higher is ensured, generation of dioxin is greatly reduced, thus, the emission concentration of dioxin is controlled to be lower than the national standard, control is convenient, and the structure is simple.

Description

technical field [0001] The invention belongs to the field of air preheaters, in particular to a steam-air preheater for controlling the emission concentration of dioxins. Background technique [0002] With the rapid development of urbanization, the amount of domestic waste removal has also continued to increase, and waste incineration technology has been widely used in line with the requirements of harmless waste disposal, reduction, and resource utilization. Garbage contains a lot of plastics, resulting in a large amount of sulfur oxides in the incineration flue gas, which can easily cause low-temperature corrosion and serious ash deposition on the heating surface at the tail of the waste heat boiler, thus affecting the life of the boiler and the stability of operation. [0003] Among them, the air preheater is the last component of the flue gas side flow of the waste heat boiler, and it is arranged at the most downstream of the flue gas as the tail heating surface. In ord...

Claims

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Application Information

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IPC IPC(8): F23G5/46F23J15/02F23J15/06
CPCF23G5/46F23J15/02F23J15/06
Inventor 周谦张杰
Owner 上海双木散热器制造有限公司
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