New pin-plate coupled heat transfer enhancement element and special-shaped tube-panel water-tube heat exchanger
A heat transfer enhancement, special-shaped tube technology, applied in the direction of heat exchanger types, heat exchanger shells, indirect heat exchangers, etc., can solve the problems of occupying flue space, difficult to achieve heat recovery device space, etc., to achieve less ash accumulation , Occupy small space, good anti-wear performance
Active Publication Date: 2015-10-21
CENT SOUTHERN CHINA ELECTRIC POWER DESIGN INST CHINA POWER ENG CONSULTING GROUP CORP +1
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Problems solved by technology
However, in some cases, the arrangement of the flue is extremely compact, and there is no waste heat recovery device arranged in the horizontal straight section of the flue between the air preheater and the horn-shaped inlet of the electrostatic precipitator; Installing a denitrification device on the flue occupies the space above the horizontal straight section of the flue, making it difficult to arrange the heat recovery device in terms of space and implementation
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[0032] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.
[0033] Such as figure 1 As shown, a new pin-plate coupling type heat transfer enhancement element of the present invention includes a base pipe 3, and multiple rows of pin fins 1 are arranged symmetrically on both sides of the base pipe 3 perpendicular to the flow direction of the flue gas. Ribs 2 are provided on the front and rear surfaces of the pipe 3 in the direction of flue gas flow.
[0034] As a preferred embodiment of the present invention, the base pipe 3 and the rib plate 2 are welded by plain pipe and flat steel or directly rolled finned pipe.
[0035] As a preferred embodiment of the present invention, the pin fins 1 are arranged in 2 to 4 rows. The pin-fin pitch along the axial direction of the base tube can adopt equal pitch or variable pitch to achieve the best heat transfer effect; The layout space of the device, th...
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The invention discloses a novel needle-plate-coupling-type heat transfer enhancement element and a special-shaped-pipe-screen-type water pipe heat exchanger. The heat transfer enhancement element comprises a base pipe, multiple rows of needle pins are symmetrically arranged on two-side surfaces, perpendicular to the smoke flowing direction, of the base pipe, ribbed plates are arranged on front-rear surfaces, perpendicular to the smoke flowing direction, of the base pipe, each heat exchange pipe screen of the heat exchanger is composed of the heat transfer enhancement elements, a lower-portion inlet header and an upper-portion outlet header of two ends of adjacent heat exchanger pipe screens are communicated through a large-diameter elbow respectively, and multiple rows of the heat exchange pipe screens are arranged in a flue space in a horn-shaped inlet section of an electrostatic dust collector. The heat transfer enhancement element has the advantages of good wear-resistant performance, less proneness to dust accumulation and high heat transfer capability, the heat exchanger does not occupy other effective space in front of an inlet of the electrostatic dust collector, is compact in structure and extremely convenient to mount and demount on site, modularized production and splicing can be realized, smoke waste heat can be reasonably utilized, and dust collection efficiency of the electrostatic dust collector is improved.
Description
technical field [0001] The invention relates to the technical field of waste heat utilization of coal-fired boiler flue gas, in particular to a novel pin-plate coupling type heat transfer enhancement element and a special-shaped tube-panel water-tube heat exchanger. Background technique [0002] According to statistics, the exhaust gas temperature of general boilers is around 130-140°C. If high-sulfur fuel is used, the exhaust gas temperature can reach about 150°C, and the exhaust gas temperature of a generator set burning lignite can even reach 170-180°C. Generally, every 15°C decrease in the exhaust gas temperature of the boiler can increase the boiler efficiency by about 1.0%. It can be seen that the high exhaust gas temperature seriously affects the efficiency of the boiler. [0003] Excessive flue gas temperature will also greatly affect the normal operation of the electrostatic precipitator. Electrostatic precipitator is a kind of high-efficiency dust removal equipmen...
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IPC IPC(8): F28F1/20F28D7/16F28F9/26
Inventor 王辉赵钦新陈牧金鑫胡玉清王云刚
Owner CENT SOUTHERN CHINA ELECTRIC POWER DESIGN INST CHINA POWER ENG CONSULTING GROUP CORP