Method for opening environmental-friendly measuring holes on titanium composite plate chimney wall
A composite plate and chimney technology, applied in the direction of pipes, pipes/pipe joints/pipes, sampling devices, etc., can solve the problems affecting the overall quality of the chimney lining titanium, the risk of corrosion, damage to the lining titanium, etc., and achieve good promotion and application value. , The material is cheap, the effect of solving the corrosion problem
Active Publication Date: 2017-07-14
HUANENG QINMEI RUIJIN POWER GENERATION CO LTD
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Problems solved by technology
[0004] The first method: due to the small diameter of the measuring hole, the lining titanium process is highly demanding and very cumbersome. At the same time, the high temperature during carbon steel welding will damage the lining titanium, affect the overall quality of the chimney lining titanium, and bring risks to anti-corrosion
[0005] The second method: titanium metal is relatively soft, and its strength is not enough, and it cannot be used for heavy-duty measuring instruments; and titanium is expensive, and the cost performance is not high; construction is inconvenient, and the welding of titanium plates requires professionals to complete
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[0022] Take the installation of a measuring pipe (DN100, length 300mm) as an example:
[0023] 1. Material preparation:
[0024] The temperature of the wet flue gas after desulfurization is about 55°C, and the condensed water contains high chloride ions, and the pH value is about 3, which is very corrosive. Alloy materials of 316L and above must be selected to meet the corrosion resistance requirements.
[0025] A pipe made of 316L, 100 in diameter and 300 in length is used as the sampling pipe 3, with 4 316L standard alloy flanges, 6 carbon steel flanges for ordinary steel pipes, 9 blind blocking plates, and 7 bolts And nut (8) 16, supporting polytetrafluoroethylene soft rubber pad, promptly pad 5 two, some alloy welding rods.
[0026] 2. Fully weld one end of the measuring sampling tube 3 with the alloy flange 4 (with an alloy welding rod);
[0027] 3. Select the installation position of the measuring sampling tube 3 on the titanium composite plate wall, and use a plasma c...
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The invention relates to the field of environmental protection of the smoke-gas treatments in power plants, and provides a method for opening and environmental-friendly measuring holes on titanium composite plate chimney wall. Circular measuring holes are formed in the titanium composite plate chimney wall. Sampling tubes welded with alloy flanges are sleeved with polytetrafluoroethylene soft rubber gaskets, and then the sampling tubes penetrate through the measuring holes from the inner wall of a chimney, that is the titanium lining side. The inner wall of the chimney is ensured to attach the alloy flanges closely. A conventional carbon steel flange is welded on one sampling tube away from the outer wall of the chimney 50mm. Single-headed bolts, facing towards the outer wall of a titanium composite flue, penetrate through the carbon steel flanges. At the same time screws on the other side of the carbon steel flange are sleeved with nuts. The bolts and the nuts are fastened to make the screws support an outer wall plate of the chimney. Another carbon steel flange is mounted on the other side of the sampling tube and is sleeved with a polytetrafluoroethylene soft rubber gasket and a blind block board, that is, the completing of the installation. The method for opening and environmental-friendly measuring holes on titanium composite plate chimney wall is economic in cost, convenient to construct and strong in load capacity, and the corrosion problem of the titanium composite plate chimney wall after opening holes is effectively solved.
Description
technical field [0001] The invention relates to the field of flue gas control and environmental protection in power plants, in particular to a method for opening environmental protection measuring holes on the chimney wall of a titanium composite plate. Background technique [0002] Titanium composite plate (steel plate lined with titanium, the general thickness of titanium is 1.2mm) has a good anti-corrosion effect. There are a large number of titanium composite chimneys in operation in thermal power plants in my country. Due to the increasingly stringent national environmental protection policies, the new standards and norms are getting higher and higher, especially after the implementation of the ultra-low emission policy, it is necessary to add new measuring points or comparative sampling holes (measurement holes) on the existing titanium composite plate chimneys Pipeline DN00 or so), in order to meet the specification requirements. [0003] Since titanium materials can...
Claims
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IPC IPC(8): F16L5/02G01N1/10
CPCF16L5/02G01N1/10
Inventor 李健平陈常青钟彩霞文作伟晏志仁
Owner HUANENG QINMEI RUIJIN POWER GENERATION CO LTD