CN2270890Y - Backfire type boiler grate with heating pipe - Google Patents

Abstract

The utility model relates to a grate of backfire type boiler, which is characterized in that the traditional water cooling grate pipe bundle is changed into a fully hermetic heat pipe filled with a working medium, and the heat releasing end of the heat pipe extends into the liquid working medium which is filled in the lower part of a hermetic box body. An inner fin and an outer fin are both arranged on the heat pipe so that the heat transferring process is enhanced. A heat exchanger which is used for heating the outside cold water is arranged in the top of the box body, and distilled water is used as the working medium. The box body is fixedly integrated with the grate of a cantilever in order to form an independent component which is separated from a boiler body, and the integration is embedded in the boiler body. The utility model has assembling and disassembling properties, and the service life of the grate is prolonged because fouling is eliminated thoroughly.

Description

Counter-burning type boiler heat pipe grate

The utility model relates to the water-cooled grate of counter-burning type double-grate boiler, particularly a kind of heat pipe-type fire grate.

The used fire grate of present counter-burning type double-grate boiler divides two-layer up and down, and lower floor is the plain cast iron fire grate, and the upper strata is hollow water-cooled grate, and its two ends directly communicate with drum, are full of boiling water in the pipe.Can not be pure because of water quality, fouling can appear inevitably, become the obstacle of heat transfer.The thermic load at fire grate place is the highest in this kind boiler, influences when conducting heat when serious fouling in the fire grate tube bank, and water-cooled grate will burn out because of overheated.Therefore, general boiler all is furnished with water treatment facilities, thereby has increased investment and administrative expenses.In addition, existing boiler purposes is single, can not provide steam, hot water or boiling water simultaneously according to user's needs.This class boiler also have to be repaired the little boiler of shortcoming, especially diameter of difficulty, and fire grate is fixed in the body of heater, in fact can't place under repair, and use to the user and to cause very big difficulty.

The purpose of this utility model is the above-mentioned difficulties that will overcome prior art, and a kind of fire grate of non flouling behaviour is provided, and prolongs fire grate service life greatly.

Another purpose of the present utility model is to make the multipurpose boiler that boiler becomes can provide steam, hot water or boiling water simultaneously.

The 3rd purpose of the present utility model is in order to make fire grate for ease of maintenaince and change.

The purpose of this utility model realizes in the following way: in double-grate boiler, the totally enclosed heat pipe that is filled with working medium is made in hollow water-cooled grate tube bank in the past, the release end of heat of this heat pipe stretches into the bottom of an airtight casing and is dipped in the interior liquid working substance of casing, and casing top is provided with the heat exchanger of the extraneous cold water of heating; One is become in the tube bank of the fire grate of said casing and cantilever, forms an individual components that can be separated with body of heater, is inlaid in the boiler furnace, makes it to have assembling or the property dismantled.

For strengthening heat transfer, should be provided with outer fin and inner fin in the heat pipe grate tube bank.

Describe embodiment of the present utility model in detail below in conjunction with accompanying drawing.

Accompanying drawing is the structural representation of heat pipe-type fire grate.

Referring to accompanying drawing, have lower furnace door 7, middle fire door 8, upper furnace door 9 and exhanst gas outlet 5 etc. on the body of heater 10 of counter-burning type boiler.Lower fire grating 6 is arranged in the stove.Casing 1, fire grate tube bank 2 and heat exchanger 3 are drawn together in pyrotube furnace package among the figure.Fire grate tube bank 2 is made up of many parallel heat pipes, and heat pipe is L shaped, is made by seamless steel pipe, takes out air wherein, fills the heat transfer medium with water and raising operating temperature, and shut at two ends.The fire grate of cantilever tube bank 2 is stretched out from casing 1 bottom, and the two is fixed to be one.Top of chamber is equipped with helix tube or serpentine coil heat exchanger 3 in the casing 1, and the extraneous cold water of heating that needs is by passing through in the pipe.Bottom half is filled with certain quantity of fluid working medium 4.Because of the latent heat of water is big, cheaply be easy to get, non-corrosiveness adopts pure distilled water to make working medium usually, and whole box body and the extraneous air-tight state that keeps can be surrounded by heat insulation layer outside the casing 1.

L shaped heat pipe grate tube bank 2 comprises horizontal segment 22 and vertical section 21 two parts.The horizontal segment 22 that is in the burner hearth is heat absorbing end, and vertical section 21 in the casing is release end of heat.The liquid heat-transfer medium of horizontal segment is in hot junction heat absorption evaporation when heat pipe grate is heated in burner hearth.Steam is by flowing to cold junction in the pipe, and emits latent heat at this place, and the steam liquid that congeals into again flows back to the hot junction heat absorption.Cold junction is that release end of heat helps coagulating liq straight up and utilizes gravity fall to reflux.Inside and outside fin preferably is set on the heat pipe, as the heat pipe cold junction outer fin 24 can be set, the heat pipe hot junction can be provided with inner fin 23 etc., with augmentation of heat transfer.The cantilever end of heat pipe grate tube bank 2 is downward-sloping, helps rising of saturated vapor bubble and coagulating liq and refluxes.Because of whole process occurs in the airtight heat pipe, as adopt treated pure working medium distilled water, can not produce incrustation scale fully, its thermal resistance is little, heat transfer is rapid, and the furnace grate tube wall temperature is near the temperature of boiled water in the heat pipe.Water in the heat pipe grate is in saturation state, temperature is generally below 340 ℃, and general carbon steel permission operating temperature is 480 ℃, although thereby temperature height in the stove, but still can work on overall safety ground by the fire grate that carbon steel makes, so fire grate adopts general mild steel to get final product, and tube wall correspondingly can be thinner, and prolong the service life of fire grate greatly.

The release end of heat of heat pipe grate tube bank 2 makes interior liquid working substance 4 ebullition, gasifications of casing form a large amount of saturated vapors, is full of the superjacent air space of liquid working substance.Saturated vapor and heat exchanger 3 cold walls contact, and steam discharges gasification latent heat, condenses into liquid, and heat is passed to cold water in the heat exchanger, and heat exchanger 3 is with regard to exportable hot water or boiling water even steam.The liquid that condenses goes back to casing 1 bottom following of gravity effect.

Heat pipe-type fire grate among the figure preferably is inlaid in the boiler furnace 10 as a separate part together with casing, makes protrusion one side that the cantilever fire grate is housed become the part of boiler inner wall.After packing into, casing 1 should seal with boiler wall maintenance on every side.When the needs place under repair, whole heat pipe grate can disassemble from boiler body, loads onto again after fixing again.Remove and install so conveniently, overcome the shortcoming that present double grate boiler is repaired difficulty.

Pyrotube furnace raftings when capable, and the cold water that flows through heat exchanger 3 can in time be taken away the heat in the casing, and the temperature and the pressure of saturation water are lower in the casing, the good cooling results of opposite heat tube cold junction, thereby inside heat pipe slightly is negative pressure, do not have explosion danger, and the possibility of leakage is also very little.Working medium circulates in the system of sealing, can not dryout, and is safe and reliable.For preventing in the casing just in case hypertonia is equipped with safety valve 12 on the casing.Should be condensing of clean steam in the casing 1, need be provided with incoagulable gas vent valve 11.

The heat pipe-type fire grate has the advantage that heat output is big, heat transfer efficiency is high owing to thoroughly eliminated fouling and adopted the latent heat heat exchange that phase transformation is arranged.Because of conducting heat rapidly, the fire grate temperature is lower, has prolonged the service life of fire grate greatly.Boiler needn't adopt water treatment facilities simultaneously, has reduced investment and operating cost.This heat pipe-type fire grate can provide hot water, boiling water even steam for boiler is additional by heat exchanger 3, thereby becomes the multipurpose boiler.If boiler itself is used to provide steam, then heat pipe grate just can be used to provide hot water or boiling water.If boiler itself is used to provide hot water, then heat pipe grate can be used to provide boiling water and steam.The user can be as required, selects neatly and regulate.When not needing hot water or boiling water, promptly deliver to the boiler feed water mouth, improve the inflow temperature of boiler.

Claims (3)

1, a kind of fire grate of counter-burning type boiler, comprise hollow fire grate tube bank (2), it is characterized in that said fire grate tube bank (2) is the totally enclosed heat pipe that is filled with working medium, the release end of heat of heat pipe (21) stretches into the bottom of an airtight casing (1) and is dipped in the interior liquid working substance (4) of casing, and casing (1) top is provided with the heat exchanger (3) of the extraneous cold water of heating; One is become in the fire grate of said casing (1) and cantilever tube bank (2), forms an individual components that can be separated with body of heater, is inlaid in the boiler furnace (10).

2, fire grate as claimed in claim 1 is characterized in that said heat pipe grate tube bank (2) is provided with outer fin (24) and inner fin (23), with strengthening heat transfer.

3, fire grate as claimed in claim 1 or 2 is characterized in that said heat exchanger (3) is helix tube or serpentine coil heat exchanger.

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