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CN-122015288-A - Multi-fuel nine-return-stroke efficient energy-saving boiler

CN122015288ACN 122015288 ACN122015288 ACN 122015288ACN-122015288-A

Abstract

The invention discloses a multi-fuel nine-return-stroke high-efficiency energy-saving boiler which comprises a water jacket shell, a hearth, a grading air supply assembly and a heat exchange assembly, wherein the water jacket shell is a closed water cavity structure formed by enclosing an outer heat insulation shell and an inner furnace wall, the top of the water jacket shell is of an arc structure and is provided with an air outlet, the hearth is arranged in the water jacket shell, a grate and a furnace door are arranged at the bottom of the hearth, a lower ash removal port is arranged below the grate and is used for cleaning ash in a grate area, the grading air supply assembly comprises a primary air channel, a secondary air channel and a tertiary air channel, the primary air channel is arranged below the grate, the secondary air channel and the tertiary air channel are symmetrically arranged on the side wall of the hearth, the heat exchange assembly comprises preheating pipes horizontally arranged right above the hearth, and a plurality of annular fire pipes arranged right above the preheating pipes, and the annular fire pipes are arranged in a multi-layer staggered mode along the flow direction of smoke.

Inventors

  • YANG WENQING

Assignees

  • 漳州沸扬锅炉有限公司

Dates

Publication Date
20260512
Application Date
20260327

Claims (6)

  1. 1. The multi-fuel nine-return-stroke efficient energy-saving boiler is characterized by comprising a water jacket shell, a hearth, a grading air supply assembly and a heat exchange assembly, wherein the water jacket shell is an enclosed water cavity structure formed by enclosing an outer heat preservation shell and an inner furnace wall, the top of the water jacket shell is of an arc structure and is provided with an air outlet, the hearth is arranged in the water jacket shell, a grate and a furnace door are arranged at the bottom of the hearth, a lower ash removal port is arranged below the grate and is used for cleaning ash in a grate area, the grading air supply assembly comprises a primary air channel, a secondary air channel and a tertiary air channel, the primary air channel is arranged below the grate, the secondary air channel and the tertiary air channel are symmetrically arranged on the side wall of the hearth, the heat exchange assembly comprises a preheating pipe horizontally arranged right above the hearth, a plurality of annular fire pipes arranged right above the preheating pipe, and a plurality of annular fire pipes are arranged in a multi-layer staggered mode along the flow direction of smoke, so that the smoke flows back to back in sequence between the adjacent annular fire pipes after rising from the hearth, nine continuous smoke heat exchange processes are formed, and the smoke is sequentially in the nine continuous flow, and the smoke heat exchange process is sequentially carried out, and the smoke is sequentially in contact with the annular heat exchange tubes and the ash return-stroke area is formed by the annular heat exchange tubes and the inner wall and the ash exchange layer is arranged on the side wall and the side wall of the annular heat exchange layer.
  2. 2. The multi-fuel nine-return high-efficiency energy-saving boiler of claim 1, wherein a water gauge for monitoring the water cavity liquid level is arranged on the outer side of the water jacket shell.
  3. 3. The multi-fuel nine-return high-efficiency energy-saving boiler of claim 1, wherein the nine flue gas heat exchange returns are formed by a staggered arrangement structure of a plurality of layers of annular fire tubes, and each time flue gas passes through one layer of annular fire tubes and turns back, one heat exchange return is correspondingly completed, so that the contact time and the heat exchange path of the flue gas and the heat exchange part are prolonged.
  4. 4. The multi-fuel nine-return high-efficiency energy-saving boiler of claim 1, wherein the primary air channel, the secondary air channel and the tertiary air channel are all communicated with the same blower, and each air channel is independently provided with an air quantity adjusting device, and the air quantity of each air channel is adjusted to adapt to different combustion demands of three fuels, namely coal, firewood and biomass particles.
  5. 5. The multi-fuel nine-return high-efficiency energy-saving boiler of claim 1, wherein the preheating pipe is fixedly arranged right above the hearth along the horizontal direction, and the bottom straight surface of the preheating pipe is used for directly absorbing radiant heat generated by combustion of fuel in the hearth to realize first-stage heat exchange.
  6. 6. The multi-fuel nine-return high-efficiency energy-saving boiler of claim 1, wherein a plurality of annular fire tubes are arranged in a multi-layer interval staggered manner along the vertical direction, and the arrangement positions of two adjacent layers of annular fire tubes are staggered, so that the flue gas forms S-shaped reciprocating turn-back flow between the adjacent annular fire tubes, and the flue gas is ensured to fully flow through the outer wall of each annular fire tube.

Description

Multi-fuel nine-return-stroke efficient energy-saving boiler Technical Field The invention relates to the technical field of boilers, in particular to a multi-fuel nine-return-stroke efficient energy-saving boiler. Background The boiler is used as a heat energy device for transferring heat energy released by fuel combustion to water and other media so as to generate hot water or steam, and is widely applied to the fields of industrial production, heating, domestic hot water supply and the like. The structure of a conventional boiler generally comprises a furnace and a single smoke tube or a simple fire tube assembly arranged above the furnace, and high-temperature smoke generated by combustion of fuel in the furnace is discharged through the smoke tube, and heat exchange is performed with water in a water cavity of the boiler in the process. However, the existing boiler generally has the problems of short flue gas flow path and insufficient heat exchange in design. Specifically, most of the flue gas of the boiler is discharged from the chimney only through one to two return strokes, and a large amount of heat in the flue gas is not absorbed effectively, namely, is dissipated into the atmosphere, so that the heat efficiency of the boiler is difficult to improve, and energy waste is caused. In addition, the traditional single-return or short-return structure enables the contact time of the flue gas and the heat exchange component to be too short, the heat exchange area is limited, and the deep utilization of the heat energy of the flue gas cannot be realized. Therefore, how to extend the flow path of the flue gas and increase the heat exchange times in a limited space, so as to improve the heat efficiency of the boiler is a technical problem to be solved in the field. Disclosure of Invention The invention aims to provide a multi-fuel nine-return-stroke efficient energy-saving boiler which is used for solving the problem of low heat efficiency caused by short flue gas flow and insufficient heat exchange of the conventional boiler. In order to achieve the above purpose, the present invention adopts the following technical scheme: the utility model provides a high-efficient energy-saving boiler of nine return strokes of many fuels, includes water jacket casing, furnace, hierarchical air supply subassembly and heat exchange component, the water jacket casing is outer heat preservation shell and inlayer oven enclose into closed water cavity structure, water jacket casing top is arc structure and is equipped with the gas outlet, the furnace set up in the inside of water jacket casing, just the furnace bottom is equipped with grate and furnace gate, the grate below is equipped with the lower part deashing mouth and is used for clearing up grate regional lime-ash, hierarchical air supply subassembly includes primary air channel, secondary air channel and tertiary air channel, the primary air channel corresponds the setting of grate below, secondary air channel and tertiary air channel symmetry arrange in the furnace lateral wall, the heat exchange component includes the level and arranges in the preheating tube directly over the furnace, and locates many annular firetubes just over the firetube, many the annular firetube is the multilayer crisscross arrangement along the flue gas flow direction, makes the flue gas rise the back in proper order between adjacent annular firetube, forms nine continuous heat exchange return strokes, and in nine continuous flow outer wall and in proper order with the preheating tube and tertiary air channel symmetry arrange in the annular side wall of the annular shell of the side wall of furnace and the heat exchange tube of the annular shell and the annular side wall of the heat exchange tube of the installation of the boiler is equipped with the dust collector. Preferably, a water level gauge for monitoring the water cavity liquid level is arranged on the outer side of the water jacket shell. Preferably, the nine flue gas heat exchange return strokes are formed by a staggered arrangement structure of a plurality of layers of annular fire tubes, and each time flue gas passes through one layer of annular fire tubes, the flue gas is turned back once, namely, one heat exchange return stroke is correspondingly completed, so that the contact time and the heat exchange path of the flue gas and the heat exchange component are prolonged. Preferably, the primary air channel, the secondary air channel and the tertiary air channel are all communicated with the same blower, and each air channel is independently provided with an air quantity adjusting device, and the different combustion demands of three fuels, namely coal, firewood and biomass particles, are adapted by adjusting the air quantity of each air channel. Preferably, the preheating pipe is fixedly arranged right above the hearth along the horizontal direction, and the bottom straight surface of the preheating pipe is used for directly ab