Large-scale grate firing pressure phase change heat exchange hot water boiler

Abstract

The invention relates to a large-scale grate firing pressure phase change heat exchange hot water boiler, which is widely applied to the fields of large-scale concentrated heating supply and industries. The hot water boiler comprises a longitudinally-arranged boiler barrel, a longitudinal-transverse collection box, a communicating pipe, a wall pipe, a water cooling wall, a convection bank, a heat exchanger, and the like; the structural frame of a boiler body has a compact structure and strong integrity and greatly reduces the steel frame support of a non-heating surface; a water path of the heat exchanger has a plurality of return strokes without a clapboard to achieve a perfect matching with the boiler, and boiler water circulates to achieve the automatic adjustment of even fall and raise; smoke dust passes through multiple times of gravity settlings through dilatancy and deceleration and multi-loop flow inertia separations in the boiler so as to greatly reduce the primary discharge concentration of the smoke dust; the convection bank is vertically provided with a transverse washing brush to greatly reduce the heating area so as to reduce the thermal resistance and the flow resistance; a full film type water cooling wall is adopted so that the smoke gas flow path is long, the heat exchange effect is good and the heat availability is high; and the boiler does not have scale formation and oxygen corrosion, does not need pollution discharge and use a softening water device and a deoxidization device, and is a concentrated heating supply boiler with remarkable high efficiency, energy saving, water saving, consumption reduction and emission reduction.

Description

technical field [0001] The present invention relates to four major boiler series, that is, large-scale layer-fired pressure phase-change hot water, natural circulation hot water, steam and heat and power cogeneration boilers, and especially relates to a layer-fired pressure phase boiler for large-scale central heating. Change hot water boiler. Background technique [0002] There are many types of large-scale central heating hot water boilers currently popular in the market. Although there are differences, they all have common shortcomings. One is that the water quality requirements are relatively high. Once scale is generated, the lighter ones will increase thermal resistance and reduce thermal efficiency , In severe cases, violent tube accidents occur. Therefore, expensive water softening equipment and chemicals are required, strict water quality testing is required, and regular sewage discharge is required, which not only increases initial investment and operating costs, ...

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Problems solved by technology

[0004] Most of the phase-change hot water boilers sold in the market are used in small pressureless boilers. Due to the technical defects of the water return structure of the heat exchanger, that is, the multi-return water channels are separated by partitions in one drum. , so that the reliability of manufacturing quality is reduced, and it is difficult to overhaul and repair. Due to the small temperature difference between the saturation temperature and the low temperature without pressure, the heating surface required is increased, and the cost of the heat exchanger that has already increased is greatly increased. Therefore, the original It has the performance advantage of phase change heat, but loses the market competitive advantage, and it is more difficult to realize the large-scale phase change heat

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