CN105890177B - With the forced circulation hot-water heating system from power-failure protecting function - Google Patents
With the forced circulation hot-water heating system from power-failure protecting function Download PDFInfo
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- CN105890177B CN105890177B CN201610388395.6A CN201610388395A CN105890177B CN 105890177 B CN105890177 B CN 105890177B CN 201610388395 A CN201610388395 A CN 201610388395A CN 105890177 B CN105890177 B CN 105890177B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/20—Arrangement or mounting of control or safety devices
- F24H9/2007—Arrangement or mounting of control or safety devices for water heaters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
- F22D1/003—Feed-water heater systems
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
- F24H1/22—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating
Abstract
The present invention provides a kind of forced circulation hot-water heating system with from power-failure protecting function; hot-water heating system provided by the invention specifically includes that water return header, water-cooling wall lower header, water-evaporating furnace, water-cooling wall upper collecting chamber, drum, economizer and recirculation pipe; burner hearth is as low temperature heating surface, and economizer is as high-temperature surface heat supply.Water circulation process in boiler are as follows: water return header to water-cooling wall lower header enters back into water-cooling wall upper collecting chamber, then to drum, flows into economizer by drum, finally flow out from economizer exit.And the first recirculation pipe and the second recirculation pipe are set; when hot-water boiler has a power failure; water circulation between drum and water return header, drum and economizer is converted into two relatively independent natural convection loops; and keep nominal situation water (flow) direction; it prevents the heated vaporization of working medium in furnace wall cooling and economizer pipeline and causes accident; hot-water boiler hot-water heating system is realized from power-failure protecting function, also effectively prevents the low-temperature corrosion of heating surface.
Description
Technical field
The present invention relates to field of heat energy power more particularly to a kind of forced circulation hot water systems with from power-failure protecting function
System.
Background technique
Hot-water boiler is to provide the thermal energy conversion equipment of hot water, and the heat transfer that it releases burning fuel is in pot
Working medium-water makes coolant-temperature gage in pot increase for user's heating or live.With the aggravation of northern China winter haze, country is right
The gradually attention of air contaminant treatment, in recent years central heating are widely used with large capacity hot-water boiler, to increase collection
Middle heat supply reduces environmental pollution.
Special type of the hot-water boiler because of operating condition, it is necessary to assure boiler hot-water does not vaporize, and guarantees that the safety of water circulation can
It leans on.After especially having a power failure suddenly, Working fluid flow is poor and is easy to produce vaporization, causes the accident and influences safety.Additionally there are
The problems such as low-temperature corrosion of low temperature heating surface.
The forced water circulation in hot-water boiler is mainly realized by pipeline and circulating pump in existing hot-water boiler, is realized in pot
Water temperature increases, and final output meets the hot water of heating parameter.Fig. 1 is typical Water Circulation for Hot Water Boiler schematic diagram, as shown in Figure 1,
The typical water circulation process of hot-water boiler are as follows: return water first flows into economizer import header 1, then is entered by economizer import header 1
Economizer 2 is introduced the cold water section 3 of drum after the heating of economizer 2 by aqueduct；From the cold water section 3 of drum again after downcomer
Respectively partial hearth water-cooling wall lower header 4 supplies water, then on the water-cooling wall of part after the heating of partial hearth water-cooling wall uplink
Header 6, then another cold water section of drum is introduced by introducing pipe respectively, then after another cold water section of drum and other downcomer respectively
It supplies water for the other parts water-cooling wall lower header 5 of burner hearth, to part water cooling after the heating of the other parts water-cooling wall uplink of burner hearth
Wall upper collecting chamber 6, then another cold water section of drum is introduced by introducing pipe respectively and is finally reached after specified water supply parameter again repeatedly
Drum hot water section 7 is imported through part water-cooling wall upper collecting chamber 6, the water outlet gate valve through drum hot water section 7 enters heating system and supplies outward
Heat, to complete the transformation of Water Circulation for Hot Water Boiler function.
The hot-water heating system of existing hot-water boiler will using medium process identical with the steam/water circulating process of steam boiler
Economizer is as boiler blow-down water low temperature heating surface, and burner hearth provides height as the high-temperature water heating surface heated again and by drum
Temperature water outlet meets heat user demand.The hot-water heating system, since the working medium of economizer low-temperature zone is that the low temperature heated without boiler returns
Water, therefore the tube wall temperature of economizer low-temperature zone is very low, and is in flue gas low-temperature position, reduces the dew-point temperature of flue gas, from
And cause the low-temperature corrosion of heating surface.
The hot-water heating system of existing hot-water boiler needs to carry out function to drum inner space because of the demand of water circulation process
Segmentation.Namely drum had both been used as economizer and the intermediate of burner hearth part to connect header, belonged to water at low temperature (claiming cold section) container, simultaneously
Again as high-temperature water (claiming hot arc) the container outward supplying heat heated again by burner hearth, it is therefore desirable to pass through setting pot inside drum
Cylinder partition realizes the division of hot arc and Leng Duandeng different function area and maintains normal hot water circuit.To meet multiple water circulations
The needs of process make drum diaphragm structure is complicated, maintenance is difficult and installs manufacture to require also to ensure the safe and reliable of water circulation
Strictly.Once installation designs and unreasonable the disorder of water circulation system will occur and lead to serious safe water circulation problem.Together
There are the cold section of functional areas different with hot arc for Shi Yinwei drum, cause drum thermal deviation uneven and generate alternation thermal (temperature difference) stress, hold
Easily cause fatigue rupture, crisis safety.
The hot-water heating system of existing hot-water boiler does not have from power-failure protecting function.Though special to different cold section of working medium flows
The function is realized equipped with the pipeline controlled with valve, but is completely dependent on manual control, and quantity is more, is operated constant.Work as pot
When furnace has a power failure suddenly, entire hot water cyclesystem is in because losing the power of circulating pump stagnates recurrent state；Due to drum every
The presence of plate, cause in drum between hot arc and cold section and be cold section each between working medium it is still relatively independent, cannot be effectively formed
Natural Circulation；And the limitation of manual control, so that boiler safety is completely dependent on artificial treatment, there are serious hysteresis quality, Bu Nengli
Carve the requirement for meeting power-failure protecting；Simultaneously because hot-water heating system is filled with water in accidental conditions lower pipeline, at this time in furnace
There are still certain heat, phenomena such as the heated vaporization of the water in hot-water heating system can be made and stagnation, refluence and water attack occurs, it is easy
Generation accident, there are larger security risk, the safety of Water Circulation for Hot Water Boiler is poor.
Summary of the invention
The present invention provides a kind of forced circulation hot-water heating system with from power-failure protecting function, to solve existing hot-water boiler
Due to hot-water heating system problem bring drum fatigue and partition problem, low-temperature corrosion problem, water circulation integrity problem and
The problems such as power-failure protecting, so that hot-water heating system is more safe and reliable.
It is provided by the invention a kind of with including: water return header, water from the forced circulation hot-water heating system of power-failure protecting function
Cold wall lower header, water-evaporating furnace, water-cooling wall upper collecting chamber, drum, economizer and recirculation pipe；
Water-evaporating furnace is mounted on above the hot-water boiler combustion apparatus, generates heat for partially absorbing fuel combustion
Amount；Economizer is mounted in hot-water boiler back-end ductwork, for absorbing the heat of tail flue gas release；
The water outlet of water return header is connect with the water intake end of water-cooling wall lower header, and water return header is used for water-cooling wall lower header
It supplies water；Water-cooling wall is laid in water-evaporating furnace side wall, water-cooling wall both ends respectively with the water outlet of water-cooling wall lower header and water-cooling wall
The water intake end of upper collecting chamber connects, and water-cooling wall is used to absorb the heat generated in water-evaporating furnace, to heat the water in water-cooling wall；
Water-cooling wall lower header is located at water-evaporating furnace bottom, and water-cooling wall lower header from the water of water return header for that will be sent into
In water-cooling wall；
Water-cooling wall upper collecting chamber is located at the top of water-evaporating furnace, and the water outlet of water-cooling wall upper collecting chamber is connect with drum, water-cooling wall
The hot water that upper collecting chamber is used to flow on water-cooling wall is sent into drum；
Drum is arranged among burner hearth and economizer pipeline, be not provided in drum the drum of hot arc and cold section of function division every
Plate, drum internal run-through only play the effect of intermediate mixing header, pass through downcomer between drum and the import header of economizer
Connection, so that the high-temperature water in drum flows into economizer；
The outlet header of economizer is used to the high-temperature water heated again in economizer being sent into heating system outward supplying heat；
Recirculation pipe includes the first recirculation pipe and the second recirculation pipe；
First recirculation pipe is connected between drum and water return header, automatic running.When operating normally, with furnace water cooling
Wall be it is in parallel rise flowing, because using being configured by flow and hydrodynamic characterisitic not by flue gas and no longer ad hoc be used for
The manual control valve of power-failure protecting, does not influence the water flow of furnace wall cooling.When hot-water boiler has a power failure, the first recirculation pipe
Immediately auto-conversion function and play the effect of downcomer, so that the water in drum is flowed into water-cooling wall next part by the first recirculation pipe
Case；
Second recirculation pipe is connected between drum and the outlet header of economizer, automatic running.When operating normally, with
Economizer downcomer is water flowing in parallel lower, because using being configured by flow and hydrodynamic characterisitic not by flue gas and not
The ad hoc manual control valve for power-failure protecting again, does not influence the water flow of economizer.When hot-water boiler has a power failure, second again
Circulation pipe immediately auto-conversion function and play the effect of aqueduct, so that the water in economizer is flowed into pot by the second recirculation pipe
In cylinder.
Optionally, the import header of economizer is connect with the drum, so that the water in drum adds by the economizer
It is re-fed into after heat in the heating system.
Optionally, the drum is the pressure-bearing type list drum of internal run-through.
Optionally, first recirculation pipe is arranged between the water return header and the drum.
Optionally, second recirculation pipe is arranged between the high-temperature economizer outlet header and the drum.
Optionally, first recirculation pipe and second recirculation pipe are the pipe of the free switching flows of internal liquid
Road；The maximum stream flow of first recirculation pipe is less than the maximum stream flow of dispersion pipe；The maximum stream flow of second recirculation pipe
Less than the maximum stream flow of downcomer.
Optionally, the water-cooling wall lower header includes: front water wall lower header, rear water wall lower header and side wall
Water-cooling wall lower header；
The water outlet of the water return header by downcomer respectively with the front water wall lower header, it is described after wall water cooling
Wall lower header and side water wall lower header connection.
Optionally, the water-cooling wall upper collecting chamber includes front water wall upper collecting chamber, rear water wall upper collecting chamber and side
Wall water-cooling wall upper collecting chamber；
The water-cooling wall includes for connecting under the water intake end of the front water wall upper collecting chamber and the front water wall
The front water wall of the water outlet of header, the water intake end for connecting the rear water wall upper collecting chamber and the rear water wall
The rear water wall of the water outlet of lower header and water intake end for connecting the side water wall upper collecting chamber and the side wall
The side water wall of the water outlet of water-cooling wall lower header.
Optionally, the drum is by aqueduct respectively and on the front water wall upper collecting chamber, the rear water wall
Header and side water wall upper collecting chamber connection.
Optionally, the economizer specifically includes: high-temperature economizer and low-level (stack-gas) economizer；
The low-level (stack-gas) economizer import header be the economizer import header, the low-level (stack-gas) economizer import header with
Downcomer is provided between the drum；
It is connected between the low-level (stack-gas) economizer outlet header and the high-temperature economizer import header by communicating pipe；
The high-temperature economizer outlet header is used for heating system outward supplying heat.
It is provided by the invention that have from the forced circulation hot-water heating system of power-failure protecting function include: water return header, water-cooling wall
Lower header, water-evaporating furnace, water-cooling wall upper collecting chamber, drum, economizer and recirculation pipe；Water-evaporating furnace is mounted on the hot water
Above boiler combustion equipment, heat is generated for partially absorbing fuel combustion；Economizer is mounted in hot-water boiler back-end ductwork,
For absorbing the heat of tail flue gas release；The water outlet of water return header is connect with the water intake end of water-cooling wall lower header, return water collection
Case is used to supply water to water-cooling wall lower header；Water-cooling wall is laid in water-evaporating furnace side wall, and water-cooling wall both ends are respectively and under water-cooling wall
The water outlet of header is connected with the water intake end of water-cooling wall upper collecting chamber, and water-cooling wall is used to absorb the heat generated in water-evaporating furnace,
To heat the water in water-cooling wall；Water-cooling wall lower header is located at water-evaporating furnace bottom, and water-cooling wall lower header will be for that will come from return water
The water of header is sent into water-cooling wall；Water-cooling wall upper collecting chamber is located at the top of water-evaporating furnace, the water outlet of water-cooling wall upper collecting chamber and pot
Cylinder connection, the hot water that water-cooling wall upper collecting chamber is used to flow on water-cooling wall are sent into drum；Hot arc and cold Duan Gong are not provided in drum
The drum partition that can be divided, is connected between drum and the import header of economizer by downcomer, so that the water in drum flows into
Economizer；The outlet header of economizer is used to the high-temperature water heated again in economizer being sent into heating system outward supplying heat；Again
Circulation pipe includes the first recirculation pipe and the second recirculation pipe；First, second recirculation pipe press flow and hydrodynamic characterisitic into
Row configures not by flue gas and the no longer ad hoc manual control valve for power-failure protecting, automatic running；First recycling
Pipe is connected between drum and water return header, and when hot-water boiler has a power failure, the water in drum passes through the first recirculation pipe from turn
It changes function and declines and flow into water-cooling wall lower header；Second recirculation pipe is connected between drum and the outlet header of economizer, when
When hot-water boiler has a power failure, the water in economizer is risen by the second recirculation pipe auto-conversion function to be flowed into drum.
The present invention is by setting drum and cancels drum partition, and connection inside drum is made to participate in water bath as a whole
Boiler water circulating system.The normal water circulation process of the hot-water heating system are as follows: return water is dispersed pipe to water-cooling wall next part by water return header
Case, then water-cooling wall upper collecting chamber is entered by water-cooling wall, to be flowed into drum by water-cooling wall upper collecting chamber, then from drum through downcomer
Economizer import header is flowed into, finally flow into heating system outward supplying heat from economizer exit header, while automatic conversion is set
The recirculation pipe of function meets the needs of furnace wall cooling and economizer system from power-failure protecting.The hot-water heating system process is simple
Reliably, safety is higher.
Meanwhile the present invention use the inverse process opposite with existing Water Circulation for Hot Water Boiler process, using burner hearth as low temperature by
Hot face, and heating system outward supplying heat is sent into after economizer is heated working medium as high-temperature surface again.The hot-water heating system,
Since the working medium of economizer low-temperature zone is from drum and by water-evaporating furnace heating, Temperature of Working is much higher than return water temperature
High-temperature water, correspondinglyd increase the tube wall temperature of economizer low-temperature zone, though make the dew point of flue gas still in flue gas low-temperature position
Temperature accordingly greatly improves, to solve the problems, such as the low-temperature corrosion of heating surface.
The present invention also passes through the first recirculation pipe of setting and the second recirculation pipe, and recirculation pipe presses flow and hydrodynamic characterisitic
Carry out configuration and not by flue gas, the no longer ad hoc manual control valve for power-failure protecting, automatic running, structure is simple；
And it is not provided with drum partition.When operating normally, recirculation pipe is respectively parallel fluid flow with furnace wall cooling and economizer, not shadow
Ring the water flow of furnace wall cooling and economizer.So that when boiler have a power failure when, recirculation pipe immediately auto-conversion function and play
The effect of aqueduct；Water return header, water-cooling wall lower header, water-cooling wall, water-cooling wall upper collecting chamber, drum and the first recirculation pipe it
Between immediately automatically realize natural water circulation；It is also realized automatically immediately between drum, economizer and the second recirculation pipe simultaneously
Natural water circulation realizes to hot-water boiler hot-water heating system from power-failure protecting function, thoroughly avoids manual operation, greatly mention
The high safety of Water Circulation for Hot Water Boiler system.Meanwhile because using two relatively independent Natural Circulation power-failure protecting circuits,
Respective relatively independent, automatic running has flow resistance small, each circuit system cyclicity enhancing, and it is all that hydrodynamic characterisitic is superior etc.
More advantages.
In addition, the present invention passes through setting drum, and cancel drum partition, drum is made only to play the work of intermediate mixing header
With drum internal run-through participates in Water Circulation for Hot Water Boiler as a whole, and simple flow is completely eliminated because of drum partition knot
The adverse effect that structure is complicated, installation manufacture is difficult and maintenance difficulty etc. is to water circulation system；And manufacture installation is simple and reliable.Together
When, the cold section of function zoning different with hot arc is not present in drum inside, when completely eliminating cylinder thermal deviation unevenness and having a power failure
The drawbacks of Natural Circulation protection cannot effectively be restored in drum and need artificial processing in time.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is this hair
Bright some embodiments for those of ordinary skill in the art without any creative labor, can be with
It obtains other drawings based on these drawings.
Fig. 1 is typical Water Circulation for Hot Water Boiler schematic diagram；
Fig. 2 is the forced circulation hot-water heating system schematic diagram having from power-failure protecting function that the embodiment of the present invention one provides；
Fig. 3 a be it is provided by Embodiment 2 of the present invention have from the forced circulation hot-water heating system structure of power-failure protecting function show
It is intended to；
Fig. 3 b is the forced circulation hot-water heating system another kind provided by Embodiment 2 of the present invention having from power-failure protecting function
Structural schematic diagram.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
Every other embodiment obtained without creative efforts, shall fall within the protection scope of the present invention.
Embodiment one
Fig. 2 is the forced circulation hot-water heating system schematic diagram having from power-failure protecting function that the embodiment of the present invention one provides,
As shown in Fig. 2, forced circulation hot-water heating system provided in this embodiment includes: water-evaporating furnace 100, water-cooling wall 110, water return header
200, water-cooling wall lower header 300, water-cooling wall upper collecting chamber 400, drum 500, economizer 600 and recirculation pipe；
Specifically, the entrance of the water return header 200 of the hot-water boiler of the present embodiment is connect with outer water tube, in order to outside
Water pipe send water to water return header 200.The water outlet of water return header 200 is connect with the water intake end of water-cooling wall lower header 300 simultaneously, is returned
Water header 200 into water-cooling wall lower header 300 for supplying water.
Water-cooling wall lower header 300 is located at the bottom of water-evaporating furnace 100, and water-cooling wall lower header 300 will be for that will come from return water
The water of header 200 is sent into water-cooling wall 110.
Preferably, hot-water boiler provided in this embodiment further includes circulating pump (not shown), and circulating pump is arranged in heat
In kettle furnace body water circulation system, circulating pump, which is used to provide power, is conveyed into water-cooling wall 110 for the water in water return header 200
It is interior.
Water-evaporating furnace 100 is then mounted on above hot-water boiler combustion apparatus, for absorbing the heat of fuel combustion generation.
Water-cooling wall 110, the water outlet with water-cooling wall lower header 300 respectively of 110 both ends of water-cooling wall are laid on the side wall of water-evaporating furnace 100
End is connected with the water intake end of water-cooling wall upper collecting chamber 400.Water-cooling wall 110 is used to absorb the heat generated in water-evaporating furnace 100, with
Heat the water in water-cooling wall 110；
Preferably, water-cooling wall 110 can be improved close using the fin panel casing 110 as made of band steel and hollow tube welding
Sealing property reduces burner hearth and leaks out, improves economy.
Optionally, 110 fin of fin panel casing with a thickness of 5mm, material Q235A, the pitch of light pipe is 100mm.
Optionally, above-mentioned water-cooling wall 110 or the water-cooling wall being only made of light pipe hollow tube, to control hot-water boiler
Manufacturing cost.
Specifically, water-cooling wall upper collecting chamber 400 is located at the top of water-evaporating furnace 100, the water outlet of water-cooling wall upper collecting chamber 400
It is connect by aqueduct with drum 500, so that the hot water that water-cooling wall upper collecting chamber 400 flows into water-cooling wall 110 is sent into drum 500
It is interior.
Further, drum 500 is pressure-bearing type list drum, and partition is not provided in drum 500, is one whole inside drum 500
The container of body perforation, for accommodating the hot water in water-cooling wall upper collecting chamber 400.Drum is arranged in burner hearth and economizer pipeline
Between, the drum partition that drum is divided into the functional area of cold section and hot arc in existing hot-water boiler is eliminated, sends out drum only
The effect of intermediate mixing header is waved, process is simple and reliable, eliminates since there are structure is complicated caused by drum partition, inspection
The drawbacks of cannot effectively restoring Natural Circulation protection in drum when difficult, cylinder thermal deviation is uneven and has a power failure is repaired, but also to pot
The installation requirement of cylinder reduces, and is easily installed.It is not good at by the unreasonable of interior devices of boiler or installation and is caused in addition, also overcomes
Water circulation is bad, causes Water Circulation for Hot Water Boiler short circuit, partial vaporization and influences the serious accidents such as hot-water boiler running parameter.
Preferably, drum 500 is selected into biggish internal diameter and longer length, so that drum 500 has biggish capacity,
More water can be stored, so that it is guaranteed that heating surface has longer vaporization time and higher caloric receptivity, to work as hot water
When boiler occurs to have a power failure suddenly, effectively prevent the generation of vaporization and water attack, enhance boiler from power-failure protecting ability.
Further, it is connected between drum 500 and the import header of economizer 600 by downcomer 510, so that drum 500
Interior hot water flows into economizer 600.
Preferably, in order to guarantee enough water flows, set multiple for the quantity of downcomer.
Further, the outlet header of economizer 600 is connect with external heating system pipeline, and being used for will be in economizer 600
Hot water be sent into heating system；
Optionally, dust stratification is worn and reduced in order to prevent, and economizer is staggered in arrangement using two-tube circle, while also in economizer
Elbow and position through walls install anti-friction protecting watt additional, the supporting beam of economizer uses air cooling beam.
By the water circulation system of change boiler, a kind of new water circulation process is present embodiments provided, as shown in Fig. 2,
The water circulation process of hot-water heating system under normal operation are as follows: water return header → water-cooling wall lower header → furnace wall cooling → water-cooling wall
Upper collecting chamber → drum → downcomer → economizer → heating system.Hot-water boiler provided in this embodiment uses and existing water bath
The opposite inverse process design of furnace water circulation process, using burner hearth as low temperature heating surface, and will using economizer as high-temperature surface
Working medium is sent into heating system outward supplying heat after heating again.The low-temperature corrosion for effectively preventing economizer tube bank, improves province's coal
The service life of device, it is ensured that the safe operation of hot-water boiler.
Further, above-mentioned recirculation pipe includes the first recirculation pipe 710 and the second recirculation pipe 720.Specifically, first
Recirculation pipe 710 is connected between drum 500 and water return header 200.By the way that the first recirculation pipe 710 is arranged, work as hot-water boiler
After power failure, the first recirculation pipe 710 can between drum and water-cooling wall auto-conversion function and play the effect of downcomer, make burner hearth
The water circulation of water wall surface still maintains the water (flow) direction under operating normally.That is, drum and water return header at this time
Between water circulation process are as follows: water return header to water-cooling wall lower box collecting pipe, then by water-cooling wall to drum, finally by drum through first
Recirculation pipe flows back into water return header.Due to ensure that the heated pipeline of original water-cooling wall remains as time to rise overally
Road, it is therefore prevented that phenomena such as because of heated vaporization refluence, stagnation and water attack occur for water in pipeline avoids the hair of hot-water boiler accident
It is raw, to realize the safety for increasing hot-water heating system from power-failure protecting function.
Second recirculation pipe 720 is connected between drum 500 and the outlet header of economizer.When hot-water boiler has a power failure suddenly
When, the second recirculation pipe 720 can between drum 500 and economizer tube auto-conversion function and play the effect of aqueduct, make
The water circulation of economizer surface still maintains water (flow) direction under original normal operation, by the at economizer exit header
Two recirculation pipes 720 import drum 500.That is, economizer surface circuit remains one and rises overally at this time
Circuit, it is therefore prevented that phenomena such as because of heated vaporization refluence, stagnation and water attack occur for water in pipeline avoids hot-water boiler accident
Occur, to realize the safety for increasing boiler from power-failure protecting function.Wherein, recirculation pipe presses flow and hydrodynamic force
Characteristic is configured not by flue gas, and the no longer ad hoc manual control valve for power-failure protecting, automatic running.Together
When, the maximum stream flow of the first recirculation pipe is less than the maximum stream flow of dispersed downcomer；The maximum stream flow of second recirculation pipe is small
In the maximum stream flow of downcomer.
The drum partition of hot arc and cold section of function division is not provided with inside drum in this way, while in drum and water return header
Between and drum and economizer exit header between be respectively arranged with recirculation pipe, and recirculation pipe presses flow and hydrodynamic force
Characteristic is configured not by flue gas, and the no longer ad hoc manual control valve for power-failure protecting, automatic running.
Forced circulation hot-water heating system provided in this embodiment cancels existing water bath by the way that the drum of internal run-through is arranged
Drum is divided into the functional area of cold section He hot arc by drum partition, simple flow eliminates drum due to existing in furnace
It cannot be effectively extensive in drum when barrel structure caused by drum partition is complicated, maintenance is difficult, cylinder thermal deviation is uneven and has a power failure
The drawbacks of multiple Natural Circulation protection.Meanwhile by being arranged the first recirculation pipe between drum and water return header, and drum with
Second recirculation pipe is set between the outlet header of economizer, recirculation pipe by flow and hydrodynamic characterisitic carry out configuration and not by
Flue gas, the no longer ad hoc manual control valve for power-failure protecting, automatic running, structure are simple.When operating normally, then
Circulation pipe is respectively parallel fluid flow with furnace wall cooling and economizer, does not influence the water flow of furnace wall cooling and economizer.Make
When proper hot-water boiler has a power failure suddenly, the water circulation between drum and water-cooling wall, drum and economizer stills remain in normal fortune
Water (flow) direction under row, it is therefore prevented that phenomena such as because of heated vaporization refluence, stagnation and water attack occur for water in pipeline, so as to avoid
The generation of pipe explosion accident realizes having a power failure certainly for hot-water boiler simultaneously because the water in pipeline still maintains Natural Circulation state
Defencive function increases the safety of hot-water boiler.
Embodiment two
Fig. 3 a be it is provided by Embodiment 2 of the present invention have from the forced circulation hot-water heating system structure of power-failure protecting function show
It is intended to.Fig. 3 b is the forced circulation hot-water heating system another kind structure provided by Embodiment 2 of the present invention having from power-failure protecting function
Schematic diagram.As shown in Figure 3a, 3b, on the basis of the above embodiment 1, further, provided in this embodiment that there is automatic stop
The water-cooling wall lower header 300 of the forced circulation hot-water heating system of electric protection function includes: front water wall lower header 310, Hou Qiangshui
Cold wall lower header 320 and side water wall lower header 330, wherein side water wall lower header 330 at least two.
Specifically, the water outlet of water return header 200 by multiple dispersion pipes 210 respectively with front water wall lower header 310,
Rear water wall lower header 320 and side water wall lower header 330 connect.
Correspondingly, the water-cooling wall upper collecting chamber 400 in the present embodiment includes: front water wall upper collecting chamber, on rear water wall
Header 420 and side water wall upper collecting chamber 430, wherein the quantity and side water wall next part of side water wall upper collecting chamber 430
The quantity of case 330 is consistent.
Optionally, the front water wall upper collecting chamber in the present embodiment and rear water wall upper collecting chamber, which can also merge, is designed as
The front-back wall water-cooling wall upper collecting chamber of one entirety；The header can also be cancelled, keep front water wall and rear water wall pipe direct
It is connected with drum 500.
Further, the water-cooling wall in the present embodiment includes: front water wall 111, rear water wall 112 and side wall water
Cold wall 113.
Specifically, front water wall 111 is used for the water intake end of front water wall upper collecting chamber and front water wall lower header
310 water outlet is attached, and rear water wall 112 is used for the water intake end and Hou Qiangshui of rear water wall upper collecting chamber 420
The water outlet of cold wall lower header 320 is attached, and side water wall 113 is used for the water intake end of side water wall upper collecting chamber 430
It is attached with the water outlet of side water wall lower header 330.
Further, drum 500 is by more aqueducts 520 respectively and on front water wall upper collecting chamber, rear water wall
Header 420 and side water wall upper collecting chamber 430 connect.
The water delivery effect of hot-water boiler can be improved by the way that multiple water-cooling wall lower headers 300 and water-cooling wall upper collecting chamber 400 are arranged
The utilization rate of rate and thermal energy.
Further, the economizer 600 of hot-water boiler provided in this embodiment includes high-temperature economizer 610 and low-level (stack-gas) economizer
620.Wherein, 620 import header 621 of low-level (stack-gas) economizer is the import header of economizer 600,620 import header of low-level (stack-gas) economizer
621 are connect by multiple downcomers 510 with drum 500, and the hot water in drum 500 is made to flow into 620 import header of low-level (stack-gas) economizer
In 621, further to heat.By extremely between 610 import header 611 of 620 outlet header 622 of low-level (stack-gas) economizer and high-temperature economizer
A few communicating pipe 623 connects, so that the hot water in low-level (stack-gas) economizer 620 be made to enter in high-temperature economizer 610, by hot water into one
Step heating.610 outlet header 612 of high-temperature economizer is connect with heating system, namely when hot water carries out in high-temperature economizer 610
After heating, is entered in heating system pipeline by 610 outlet header of high-temperature economizer, provide hot water for heating system.
Further, the first recirculation pipe 710 provided in this embodiment is connected between drum 500 and water return header 200.
By the way that the first recirculation pipe 710 is arranged, after hot-water boiler has a power failure, the first recirculation pipe 710 can be between drum and water-cooling wall certainly
Dynamic conversion function and the effect for playing downcomer, make the water of furnace wall cooling surface recycle the water still maintained under operating normally
Flow direction.That is, the water circulation process between drum and water return header at this time are as follows: water return header to water-cooling wall lower header
Pipe, then by water-cooling wall to drum, water return header finally is flow back into through the first recirculation pipe by drum.Due to ensure that original water
The heated pipeline of cold wall remains as the circuit to rise overally, it is therefore prevented that water occurs to flow backwards, stagnate due to heated vaporize in pipeline
And phenomena such as water attack, the generation of hot-water boiler accident is avoided, to realize from power-failure protecting function, increases hot-water boiler
Safety.
Further, the second recirculation pipe 720 provided in this embodiment is arranged in 610 outlet header of high-temperature economizer and pot
Between cylinder 500.When hot-water boiler has a power failure suddenly, the second recirculation pipe 720 can be in 610 outlet header of high-temperature economizer and drum
500 auto-conversion functions and the effect for playing aqueduct, enable the hot water in high-temperature economizer 610 to pass through the second recirculation pipe
720 flow back into drum 500, that is to say, that the water circulation process between drum and economizer at this time are as follows: drum 500 → be lauched
510 → low-level (stack-gas) economizer of pipe, 620 import header → 620 outlet headers of low-level (stack-gas) economizer → communicating pipe → high-temperature economizer 610 into
Mouth header → second 720 → drum of recirculation pipe 500, it is ensured that when hot-water boiler has a power failure suddenly, drum 500 and economizer
Water circulation between 600 still maintains water (flow) direction under normal operation, it is therefore prevented that water is due to heated vaporize in pipeline
Phenomena such as refluence, stagnation and water attack, avoid the generation of Adopted For Pipe-bursting In Hot-water Boiler accident.
Further, in order to reduce influence when recirculation pipe works to hot-water boiler normal duty, recirculation pipe is avoided
Excessive shunting is generated to water flow in drum 500, the passable maximum stream flow of the first recirculation pipe 710 is set smaller than point
The passable maximum stream flow of separate tube 210；The passable peak flow values of second recirculation pipe 720 are set as can less than downcomer 510
By maximum stream flow.
Optionally, when the quantity of the first recirculation pipe 710 is identical as the quantity of dispersion pipe 210, the second recirculation pipe 7520
Quantity it is identical as the quantity of downcomer 510 when, the actual internal area of 710 pipeline of the first recirculation pipe can be set smaller than point
The actual internal area of 210 pipeline of separate tube, and the actual internal area of 720 pipeline of the second recirculation pipe is set smaller than downcomer
The actual internal area of 510 pipelines；Alternatively, when the actual internal area of 710 pipeline of the first recirculation pipe and the stream of 210 pipeline of dispersion pipe
Logical sectional area is identical, and the actual internal area of 7520 pipeline of the second recirculation pipe is identical as the actual internal area of 510 pipeline of downcomer
When, the quantity of the first recirculation pipe 710 can be set smaller than to the quantity of dispersion pipe 210, and by the second recirculation pipe 720
Quantity is set smaller than the quantity of downcomer 510.
In short, the number of tubes and pipeline flow sectional area of the first recirculation pipe of change 710 and dispersion pipe 210 can be passed through
Mode, so that the passable maximum stream flow of the first recirculation pipe 710 is set smaller than the passable maximum stream flow of dispersion pipe 210；
And by way of number of tubes and pipeline flow sectional area changing the second recirculation pipe 720 and downcomer 510, so that the
The passable maximum stream flow of two recirculation pipe 720 is set smaller than the passable maximum stream flow of downcomer 510.
Further, the forced circulation hot-water heating system provided in this embodiment having from power-failure protecting function, can apply
In hot-water boiler, and hot-water boiler is other than forced circulation hot-water heating system, can also include separator, separation outlet turning cigarette
Road, tail vertical well gas flue, air preheater, ash bucket, material returning device and refeed line.
Specifically, being provided with air inlet, first outlet and second outlet on separator.Wherein, the air inlet of separator
It is connect with the exhaust pass of water-evaporating furnace 100.At least one high temperature cyclone separator is provided in separator, being used for will be from water
The flue gas entered in the exhaust pass of cold wall burner hearth 100 is separated with material.
The first outlet of separator is connected with the entrance for separating outlet turning flue, is sent into and is divided for the flue gas after separating
From in outlet turning flue.
The second outlet of separator and the feeding inlet of material returning device connect, and are sent into material returning device for the material after separating.
The outlet of material returning device is connect with water-evaporating furnace 100 by refeed line, for the material after separation to be re-fed into
In water-evaporating furnace, wherein the quantity of refeed line can be multiple, be arranged on the lateral wall of water-evaporating furnace 100.
That is, when fuel and air are mixed and burned in water-evaporating furnace 100, fuel under fluidization situation into
Row burns and releases heat, and high-temperature material, flue gas and 110 heating surface of water-cooling wall carry out heat exchange, heats in water-cooling wall 110
Water.And the flue gas in water-evaporating furnace 100 is in the further combustion heat release in 100 top of water-evaporating furnace, while flue gas (carries a large amount of
Not sufficiently combusted material) enter separator from the exhaust pass on 100 top of water-evaporating furnace from bottom to top, in high-temp. vortex
The lower separation for carrying out flue gas and solid particle of separator effect, and the first outlet feeding point that isolated flue gas is passed through into separator
From in outlet turning flue, and the material after separation is sent into material returning device by second outlet, then returning charge is passed through by material returning device
Pipe is re-fed into water-evaporating furnace 100, makes its full combustion, improves the utilization rate of fuel, also helps environmental protection.
Further, the entrance of tail vertical well gas flue is connected with the outlet for separating outlet turning flue, after separation
Flue gas is entered in tail vertical well gas flue by separating outlet turning flue.And high temperature province is disposed in tail vertical well gas flue
Coal device 610, low-level (stack-gas) economizer 620 and air preheater, air preheater are located at the outlet end of tail vertical well gas flue.Due to separation
The temperature still with higher of flue gas afterwards, by the way that high-temperature economizer 610, low-level (stack-gas) economizer 620 and air preheater to be arranged
In tail vertical well gas flue, it can be made to fully absorb the heat of flue gas in tail vertical well gas flue, it is with heat hot water and sufficiently sharp
Use thermal energy.
Wherein, air preheater is exactly that will enter heat by cooling fin using the flue gas in hot-water boiler tail vertical well gas flue
Air preheat before homogeneous solution-type reactor can be used for improving the heat exchange performance of hot-water boiler, reduce energy to the heating surface of certain temperature
Consumption.Air preheater can be staggered in arrangement using tube bank is vertical, and pass through box-girder for its weight transmitting to hot-water boiler tail
On portion's steelframe, it is supported.
Further, the outlet of tail vertical well gas flue is connected with ash bucket, and ash bucket is in infundibulate, the biggish one end of ash bucket be into
Mouthful, the outlet connection of the entrance and tail vertical well gas flue, while the side of the lesser one end of ash bucket being provided with outlet flue, ash bucket
Outlet flue for the flue gas from tail vertical well gas flue to be expelled to outside furnace.
It is provided in this embodiment that there is the forced circulation hot-water heating system from power-failure protecting function by the way that multiple water-cooling walls are arranged
Lower header and water-cooling wall upper collecting chamber are additionally provided on hot-water boiler with improving the hydrodynamic force uniformity and carrying capacity of boiler
Separator, carries out the separation of flue gas and solid particle to the flue gas that enters out of water-evaporating furnace exhaust pass, and by separation
Flue gas is sent into separation outlet turning flue by the first outlet of separator, and the material after separation is sent by second outlet
Enter in material returning device, then burner hearth is re-fed by material returning device, make material full combustion, improves the utilization rate of fuel, while being discharged
Exhaust gas is then more conducive to environmental protection.
Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Pipe present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: its according to
So be possible to modify the technical solutions described in the foregoing embodiments, or to some or all of the technical features into
Row equivalent replacement；And these are modified or replaceed, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solution
The range of scheme.
Claims (7)
1. a kind of forced circulation hot-water heating system with from power-failure protecting function characterized by comprising water return header, water cooling
Wall lower header, water-evaporating furnace, water-cooling wall upper collecting chamber, drum, economizer and recirculation pipe；
The water-evaporating furnace is mounted on above the combustion apparatus of hot-water boiler, for partially absorbing heat caused by fuel combustion
Amount；The economizer is mounted in the back-end ductwork of the hot-water boiler, for absorbing the heat of tail flue gas release；
The water outlet of the water return header is connect with the water intake end of the water-cooling wall lower header, and the water return header is used for described
Water-cooling wall lower header supplies water；Water-cooling wall is laid in the water-evaporating furnace side wall, the water-cooling wall both ends respectively with the water cooling
The water outlet of wall lower header is connected with the water intake end of the water-cooling wall upper collecting chamber, and the water-cooling wall is for absorbing the water cooling fireplace
The heat generated in thorax, to heat the water in water-cooling wall；
The water-cooling wall lower header is located at the water-evaporating furnace bottom, and the water-cooling wall lower header will be for that will come from the return water
The water of header is sent into the water-cooling wall；
The water-cooling wall upper collecting chamber is located at the top of the water-evaporating furnace, the water outlet of the water-cooling wall upper collecting chamber and the drum
Connection, the high-temperature water that the water-cooling wall upper collecting chamber is used to flow on the water-cooling wall are sent into the drum；
The drum is arranged among the pipeline of the water-evaporating furnace and the economizer and as intermediate mixing header, institute
It states and is connected between drum and the import header of the economizer by downcomer, so that the water in the drum flows into province's coal
Device；
The outlet header of the economizer is used to the high-temperature water heated again in the economizer being sent into heating system；
The recirculation pipe includes the first recirculation pipe and the second recirculation pipe；
First recirculation pipe is arranged between the water return header and the drum；
Second recirculation pipe is arranged between high-temperature economizer outlet header and the drum；
When the hot-water boiler works normally, the first recirculation pipe rising flowing in parallel with the water-evaporating furnace, portion
The water in the water return header is divided to flow in the drum by first recirculation pipe, when the hot-water boiler has a power failure,
Water in the hot-water boiler redistributes flow automatically, so that the water in the drum is flowed by first recirculation pipe
The water-cooling wall lower header；
When the hot-water boiler works normally, second recirculation pipe and the economizer parallel fluid flow, the part pot
Water in cylinder is flow in the economizer exit header by second circulation pipe, when the hot-water boiler has a power failure, the hot water
Water in boiler redistributes flow automatically, so that the water in the economizer flows into the pot by second recirculation pipe
In cylinder；
First recirculation pipe and second recirculation pipe are the not pipeline by flue gas；First recirculation pipe
It is that internal liquid can be by the pipeline of the free switching flows of hydrodynamic characterisitic with second recirculation pipe；First recycling
The maximum stream flow of pipe is less than the maximum stream flow of dispersion pipe；The maximum stream flow of second recirculation pipe is less than the max-flow of downcomer
Amount.
2. forced circulation hot-water heating system according to claim 1, which is characterized in that the water-cooling wall lower header and described time
The connection of water header, the import header of the economizer are connect with the drum, so that the water in the drum passes through province's coal
It is re-fed into the heating system after device heating, the water-evaporating furnace is as low temperature heating surface, and the economizer is as high temperature
Heating surface.
3. forced circulation hot-water heating system according to claim 1, which is characterized in that the drum is internal run-through, and not
Single drum of drum partition for hot arc and cold section of function division is set.
4. forced circulation hot-water heating system according to claim 1 or 2, which is characterized in that the water-cooling wall lower header includes:
Front water wall lower header, rear water wall lower header and side water wall lower header；
The water outlet of the water return header is by downcomer respectively and under the front water wall lower header, the rear water wall
Header and side water wall lower header connection.
5. forced circulation hot-water heating system according to claim 1-3, which is characterized in that the water-cooling wall upper collecting chamber
It include: front water wall upper collecting chamber, rear water wall upper collecting chamber and side water wall upper collecting chamber；
The water-cooling wall includes: for connecting the water intake end of the front water wall upper collecting chamber and the front water wall lower header
The front water wall of water outlet, the water intake end for connecting the rear water wall upper collecting chamber and the rear water wall next part
The rear water wall of the water outlet of case and water intake end for connecting the side water wall upper collecting chamber and the side wall water cooling
The side water wall of the water outlet of wall lower header.
6. forced circulation hot-water heating system according to claim 5, which is characterized in that the drum by aqueduct respectively with
The front water wall upper collecting chamber, the rear water wall upper collecting chamber and side water wall upper collecting chamber connection.
7. forced circulation hot-water heating system according to claim 1-3, which is characterized in that the economizer specifically wraps
It includes: high-temperature economizer and low-level (stack-gas) economizer；
The import header of the low-level (stack-gas) economizer be the economizer import header, the import header of the low-level (stack-gas) economizer with
Downcomer is provided between the drum；
It is connected between the outlet header of the low-level (stack-gas) economizer and the import header of the high-temperature economizer by communicating pipe；
The outlet header of the high-temperature economizer is used for heating system outward supplying heat.
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| CN107327840B (en) * | 2017-08-16 | 2023-07-14 | 哈尔滨红光锅炉总厂有限责任公司 | Water flow system of low-emission circulating fluidized bed boiler |
| CN107477859B (en) * | 2017-08-31 | 2019-10-29 | 北京热华能源科技有限公司 | A kind of water heater with power-off protection and water round-robin method |
| CN115234900A (en) * | 2022-06-24 | 2022-10-25 | 哈尔滨红光锅炉总厂有限责任公司 | Circulating fluidized bed hot water boiler for burning coal powder particles and burning method thereof |
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