CN113154891B

CN113154891B - Reciprocating movable efficient energy-saving tunnel kiln

Info

Publication number: CN113154891B
Application number: CN202110513306.7A
Authority: CN
Inventors: 王树芹; 陈宏胜; 张怀功; 高志保
Original assignee: Fengtai Tianbao Building Materials Co ltd
Current assignee: Fengtai Tianbao Building Materials Co ltd
Priority date: 2021-05-11
Filing date: 2021-05-11
Publication date: 2022-10-25
Anticipated expiration: 2041-05-11
Also published as: CN113154891A

Abstract

The invention discloses a reciprocating-moving type efficient energy-saving tunnel kiln which comprises a kiln body, rails and a waste heat recovery device, wherein two sides of the kiln body are arranged on the rails through a plurality of kiln wheels, an oxygen supply pipeline is arranged between the rails on the two sides, a waste gas discharge pipe is arranged at the top of the kiln body, a rear cavity is formed in one end, opposite to an opening of a hearth, of the kiln body, and the waste heat recovery device comprises a heat storage unit arranged in the rear cavity, a heat exchange unit arranged on the inner wall of the hearth and an adjustable heat resistance mechanism used for isolating the heat exchange unit from the hearth when the hearth is heated. The working state of the heat exchange unit in the hearth is controlled by the adjustable heat resistance mechanism, so that the heat absorption of the heat exchange unit is prevented when the hearth is heated, the cooling of the hearth and heat treatment products is promoted by a waste heat recycling mode after firing is finished, the energy is fully utilized, and the aims of high-efficiency production and energy consumption saving are fulfilled.

Description

Reciprocating movable efficient energy-saving tunnel kiln

Technical Field

The invention relates to the technical field of energy-saving tunnel kilns, in particular to a reciprocating movable type efficient energy-saving tunnel kiln.

Background

At present, the tunnel kiln for heat treatment of refractory products in China is produced by adopting an intermittent mode in the prior art, a row of kiln cars for heat-treated products in the kiln are pulled out at intervals of a certain time, then the kiln cars for loading the products which are not subjected to heat treatment are pushed in, the products are heated by using electric heating elements arranged beside two side walls in the kiln, and after the products are fired, the heat-treated products are cooled for a period of time and then the kiln cars are taken out.

Because of the intermittent production, the tunnel needs to be repeatedly heated and cooled, and before the kiln car is taken out, if the waste heat in the tunnel kiln is not recycled, the energy cost for using the tunnel kiln is greatly increased.

In the prior art, an energy-saving tunnel kiln with a waste heat recycling function generally directly arranges a component for absorbing waste heat in a hearth, which causes the problems of slow temperature rise, unstable temperature and increased energy consumption of the hearth, or an independent cooling section is arranged to improve the defects, but the manufacturing cost and the occupied area of the energy-saving tunnel kiln are increased.

Disclosure of Invention

The invention aims to provide a reciprocating-moving type efficient energy-saving tunnel kiln so as to solve the technical problem that the energy-saving tunnel kiln with a waste heat recycling function in the prior art is poor in use effect.

In order to solve the technical problems, the invention specifically provides the following technical scheme:

a reciprocating-moving type efficient energy-saving tunnel kiln comprises a furnace body with a hearth, rails and a waste heat recovery device arranged in the furnace body, wherein both sides of the furnace body are arranged on the rails through a plurality of kiln wheels and reciprocate along the rails, at least one oxygen supply pipeline for supplying oxygen to the hearth is arranged between the rails on both sides, and a waste gas discharge pipe communicated with the hearth is arranged at the top of the furnace body relative to the kiln wheels;

a rear cavity is formed in one end, opposite to the opening of the hearth, of the furnace body, and the waste heat recovery device comprises a heat storage unit arranged in the rear cavity, a heat exchange unit arranged on the inner wall of the hearth, and an adjustable heat resistance mechanism used for isolating the heat exchange unit from the hearth when the hearth is heated;

and a main air pipe with one end communicated with the hearth and the other end positioned in the rear cavity is arranged on the hearth wall of the hearth, an air blowing mechanism is arranged on the main air pipe, and air heated by the heat storage unit is conveyed into the hearth through the main air pipe under the pumping of the air blowing mechanism.

As a preferable scheme of the present invention, the inner walls of the two sides of the furnace chamber are both provided with an embedded square groove for the heat exchange units to be embedded in, the adjustable heat-blocking mechanism includes a flexible heat-blocking shutter and a reciprocating driving assembly for driving the flexible heat-blocking shutter, the furnace body is provided with an accommodating groove, the wall of the embedded square groove is provided with a connecting channel communicated with the accommodating groove, the connecting channel is located between the heat exchange units on the two sides, and the flexible heat-blocking shutter passes through the connecting channel under the driving of the reciprocating driving assembly and reciprocates between the embedded square groove and the accommodating groove, so that the heat exchange units in the accommodating groove are isolated from the furnace chamber and are exposed out of the furnace chamber.

As a preferable scheme of the present invention, the square embedding groove is located between the receiving grooves at both sides, the square embedding groove is communicated with the receiving grooves through the n-shaped connecting channel, the flexible heat blocking shutter includes a plurality of strip heat blocking plates movably connected in sequence, and the plurality of strip heat blocking plates move to the outer side of the square embedding groove when the square embedding groove is opened, so as to enhance the heat insulation performance of the furnace body.

As a preferred scheme of the invention, vertical grooves are formed on the groove walls at the two ends of the embedded square groove, the flexible heat-resisting shutter further comprises a bar-shaped connecting plate connected with the adjacent bar-shaped heat-resisting plate, and the bar-shaped connecting plate and the end part of the bar-shaped heat-resisting plate are slidably arranged in the corresponding vertical grooves;

the both sides of bar connecting plate all are provided with and supply correspondingly the bar hinders the hot plate male seal groove between, both sides all seted up a plurality of spacing slide openings on the cell wall of inboard that the inter-plate seal groove is close to mutually, sliding plug installs in the spacing slide opening with corresponding bar hinders hot plate articulated flexible billet, flexible billet for the spacing lug in its lateral wall is installed to the one end of bar hinders hot plate, seted up the confession on the cell wall of inter-plate seal groove spacing lug slip embedding and both ends closed spacing groove.

As a preferred scheme of the present invention, a plurality of air outlet pipes distributed at equal intervals are embedded in the hearth wall of the hearth, the main air pipe is communicated with the hearth through the plurality of air outlet pipes, and the heat exchange units on both sides are symmetrical with respect to the plurality of air outlet pipes arranged in a straight line.

As a preferred scheme of the invention, the heat exchange unit comprises a hot water pipe, a cold water pipe, a plurality of long copper pipes and a plurality of bent copper pipes, the long copper pipes are connected through the bent copper pipes to form a heat exchanger with a circuitous and bent pipeline and communicated end to end, the cold water pipe is positioned below the hot water pipe, the cold water pipe is connected with a water inlet of the heat exchanger, and the hot water pipe is connected with a water outlet of the heat exchanger.

As a preferred scheme of the invention, a single pipe hole for communicating the rear cavity with the embedded square groove and a double pipe hole for communicating the rear cavity with the hearth are formed in the furnace body, heat insulating layers are respectively arranged on the hole walls of the single pipe hole and the double pipe hole, the cold water pipe is inserted in the single pipe hole, the hot water pipe is inserted in the double pipe hole, and a heat exchange synergistic pipe is arranged in the double pipe hole;

one end of the heat exchange synergistic pipe penetrates into the hearth, the other end of the heat exchange synergistic pipe is connected with the main air pipe, and the main air pipe is connected with the air outlet pipes in a plurality relative to the heat exchange synergistic pipe and one end of the air inlet pipe.

As a preferable scheme of the present invention, one ends of the hot water pipe and the cold water pipe connected to the heat exchanger are both arranged in a downward inclination manner, the adjacent long copper pipes are connected by the bent copper pipe to form a V-shaped flow promoting portion, and a cold end of each flow promoting portion close to the cold water pipe is arranged in an upward inclination manner to facilitate the hot water to flow upward in an inclined manner.

As a preferred scheme of the invention, the heat storage unit comprises a heat storage water tank, a heat exchange pipe and an air inlet pipe, one end of the air inlet pipe is connected with the heat exchange pipe, one ends of the cold water pipe and the hot water pipe, which are opposite to the heat exchanger, are both arranged on the heat storage water tank, and the heat exchange pipe is spirally and fittingly arranged on the wall of the heat storage water tank;

the heat exchange efficiency-increasing pipe is connected with the main air pipe through the heat exchange pipe, the heat exchange efficiency-increasing pipe and the air inlet pipe are connected with the heat exchange pipe through an electric control valve, the air inlet pipe penetrates through the hearth relative to the air inlet end of the heat exchange pipe, and the other end of the heat exchange pipe, relative to the air inlet pipe and the heat exchange efficiency-increasing pipe, is connected with the main air pipe.

As a preferable scheme of the present invention, the embedded square grooves on both sides are symmetrical with respect to the air inlet pipe and the heat exchange efficiency increasing pipe, and one end of the heat exchange efficiency increasing pipe extending into the furnace is located above one end of the air inlet pipe extending into the furnace.

Compared with the prior art, the invention has the following beneficial effects:

the adjustable heat-resisting mechanism is used for controlling the working state of the heat exchange unit in the hearth in future, so that the heat absorption of the heat exchange unit is prevented when the hearth is heated, the cooling of the hearth and heat treatment products is promoted by a waste heat recovery and reuse mode after firing is finished, the full utilization of energy is realized, and the purposes of high-efficiency production and energy consumption saving are achieved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.

FIG. 1 is a schematic diagram of the overall structure of an embodiment of the present invention;

FIG. 2 is a right side view of an embodiment of the present invention;

FIG. 3 is a schematic view of the portion A of FIG. 2 according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of a portion B shown in FIG. 2 according to an embodiment of the present invention;

FIG. 5 is a schematic structural view of a flexible thermal shutter according to an embodiment of the present invention;

FIG. 6 is a schematic diagram of a strip-shaped connection board structure according to an embodiment of the present invention;

fig. 7 is a schematic diagram of a connection channel structure according to an embodiment of the invention.

The reference numerals in the drawings denote the following, respectively:

1-furnace body; 2-a waste heat recovery device; 3-adjustable heat resistance mechanism; 4-main air pipe; 5-a blower mechanism; 6-embedding the square groove; 7-a storage groove; 8-connecting the channels; 9-air outlet pipe; 10-single-tube hole; 11-double-tube holes; 12-a heat exchange synergistic tube; 13-an electrically controlled valve; 14-a thermally insulating layer; 15-track; 16-kiln car wheels; 18-exhaust gas discharge pipe;

101-hearth; 102-a rear cavity;

201-a heat storage unit; 202-a heat exchange unit;

301-flexible thermal shutter; 302-a reciprocating drive assembly;

601-vertical groove;

3011-a strip-shaped heat-resistant plate; 3012-a strip-shaped connection plate; 3013-seal grooves between plates; 3014-limiting slide holes; 3015-a flexible steel strip; 3016-a limit bump; 3017-a limit groove;

2011-hot water storage tank; 2012-heat exchange tubes; 2013-an air inlet pipe;

2021-hot water pipe; 2022-cold water pipe; 2023-long copper tube; 2024-bending copper tube.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1 to 7, the present invention provides a reciprocating type high-efficiency energy-saving tunnel kiln, which comprises a furnace body 1 with a hearth 101, rails 15 and a waste heat recovery device 2 installed in the furnace body 1, wherein both sides of the furnace body 1 are installed on the rails 15 through a plurality of kiln wheels 16 and reciprocate along the rails 15, at least one oxygen supply pipeline for supplying oxygen to the hearth 10 is arranged between the rails 15 at both sides, and a waste gas discharge pipe 18 communicated with the hearth 101 is installed at the top of the furnace body 1 opposite to the kiln wheels 16.

The furnace body 1 is movably installed on the rails 15 at both sides through a plurality of kiln wheels 16 at both sides, when firing is carried out, a heat treatment product is placed between the rails 15 at both sides with a gap for exposing an oxygen supply pipeline, then the furnace body 1 is moved to enable the furnace body 1 to move along the rails until the stacked heat treatment product is positioned in the hearth 101, then the interior of the hearth 101 is heated up through electric heating, natural gas combustion heating and the like, the heat treatment product is fired, waste gas generated in the firing process is discharged through a waste gas discharge pipe 18, and the discharged waste gas is purified and discharged through a waste gas desulfurization purification device connected with the other end of the waste gas discharge pipe 18. Since the furnace body 1 is movable, one end of the exhaust gas discharge pipe 18 located outside the furnace 101 is connected to the exhaust gas desulfurization purification apparatus through a pipe that is slidably sealed therewith, or the exhaust gas discharge pipe 18 is made flexible and stretchable so that the exhaust gas discharge pipe 18 is kept connected to the exhaust gas desulfurization purification apparatus in accordance with the reciprocation of the furnace body 1.

On the contrary, after firing, through setting up waste heat recovery device 2 on furnace body 1 come quick recovery furnace 101 in waste heat to reach the purpose that makes the heat treatment goods in furnace 101 rapid cooling in suitable cooling rate, then remove furnace body 1, will expose the good heat treatment goods of firing of furnace body 1 and move, and before firing next time, utilize the heat of waste heat recovery device 2 recovery to preheat the intensification to furnace 101 and the heat treatment goods of waiting to fire, thereby reach the purpose that improves production efficiency and saving energy consumption.

Furthermore, a rear cavity 102 is formed in one end of the furnace body 1 opposite to the opening of the furnace 101, and the waste heat recovery device 2 includes a heat storage unit 201 arranged in the rear cavity 102, a heat exchange unit 202 arranged on the inner wall of the furnace 101, and an adjustable heat resistance mechanism 3 for isolating the heat exchange unit 202 from the furnace 101 when the furnace 101 is heated.

A main air duct 4 with one end communicated with the hearth 101 and the other end positioned in the rear cavity 102 is installed on the hearth wall of the hearth 101, an air blowing mechanism 5 is installed on the main air duct 4, and air heated by the heat storage unit 201 is conveyed into the hearth 101 through the main air duct 4 under the pumping of the air blowing mechanism 5.

The adjustable heat-resistant mechanism 3 isolates the heat exchange unit 202 embedded in the hearth wall of the hearth 101 from the hearth 101 when the hearth 101 is heated and fired so as to avoid the defects of slow heating and unstable temperature of the hearth 101 caused by the heat absorption of the heat exchange unit 202 when the hearth 101 is heated. And after firing, the adjustable heat-resisting mechanism 3 exposes the heat exchange unit 202 embedded in the wall of the hearth 101, the heat exchange unit 202 absorbs heat in the hearth 101 and conducts the absorbed heat to the heat storage unit 201 in the independently arranged preheating collection cavity, on one hand, the cooling of heat treatment products in the hearth 101 is accelerated, which is beneficial to improving production efficiency, on the other hand, the heat storage unit 201 heats air through the absorbed heat, and when next firing is carried out, hot air in the rear cavity 102 enters the hearth 101 through the pumping of the air blowing mechanism 5 and the conveying of the main air pipe 4, so that the heat treatment products in the hearth 101 and the hearth 101 are subjected to initial heating or preheating by utilizing waste heat, and the purpose of saving energy is achieved.

In the prior art, an energy-saving tunnel kiln with a waste heat recycling function generally directly arranges a component for absorbing waste heat in a hearth 101, which causes the problems of slow temperature rise, unstable temperature and increased energy consumption of the hearth 101, or arranges an independent cooling section to improve the disadvantages, but causes the increase of the manufacturing cost and the occupied area of the energy-saving tunnel kiln.

The adjustable heat resistance mechanism 3 controls the working state of the heat exchange unit 202 in the hearth 101, so that the heat exchange unit 202 is prevented from absorbing heat when the hearth 101 is heated, the temperature of the hearth 101 and heat treatment products is reduced by means of waste heat recovery and reuse after firing is finished, energy is fully utilized, and the purposes of efficient production and energy consumption saving are achieved.

Wherein, all set up the embedding square trough 6 that supplies heat transfer unit 202 embedding on the inner wall of furnace 101's both sides, adjustable heat-resisting mechanism 3 includes that the flexibility hinders hot flashboard 301 and is used for driving the reciprocal drive assembly 302 that the flexibility hinders hot flashboard 301 hinders, it accomodates groove 7 to have seted up the intercommunication on the cell wall of embedding square trough 6 and accomodate the linking channel 8 of groove 7, linking channel 8 is located between both sides heat transfer unit 202, the flexible heat-resisting flashboard 301 passes linking channel 8 and at embedding square trough 6 and accomodate reciprocating motion between groove 7 under the drive of reciprocal drive assembly 302, so that accomodate heat transfer unit 202 in the groove 7 and keep apart with furnace 101 and expose out in furnace 101.

The connecting channel 8 is arranged on the wall of the top of the embedded square groove 6, namely the flexible heat-resistant shutter 301 is driven by the reciprocating driving component 302 to open and close the embedded square groove 6 in a lifting mode, specifically, when the hearth 101 is heated and fired, the reciprocating driving component 302 drives the strip-shaped heat-resistant plate 3011 to descend in the embedded square groove 6 through the accommodating groove 7 and through the connecting channel 8 until the embedded square groove 6 is closed, so that the heat exchange unit 202 embedded in the square groove 6 is isolated from the hearth 101, and the purpose of preventing the heat exchange unit 202 from absorbing heat in the heating and firing stages of the hearth 101 is achieved. And when firing is finished, the reverse is made.

Note that, in general, the flexible heat shutter 301, the furnace body 1, and the fitting square groove 6 are insulated by providing an asbestos plate, for example, and the flexible heat shutter 301 is preferably made of a plate material having poor thermal conductivity, such as a foamed ceramic plate, for example. The reciprocating driving assembly 302 is a hydraulic oil cylinder, an air cylinder or other mechanical structures with reciprocating driving functions, and the structure of the reciprocating driving assembly 302 is designed according to the structure of the heat insulation partition plate, the opening and closing mode of the embedded square groove 6 and other factors.

It is further optimized on the above embodiment that the embedding square groove 6 is located between the two side accommodating grooves 7, the embedding square groove 6 is communicated with the accommodating grooves 7 through the n-shaped connecting channel 8, the flexible heat-blocking shutter 301 comprises a plurality of bar-shaped heat-blocking plates 3011 which are sequentially and movably connected, and the bar-shaped heat-blocking plates 3011 move to the outer side of the embedding square groove 6 when the embedding square groove 6 is opened, so as to enhance the heat-insulating property of the furnace body 1.

A plurality of bar heat-resistant boards 3011 swing joint are in order to satisfy the requirement of the bending by a wide margin of flexible heat-resistant flashboard 301, and will accomodate the groove 7 and set up in the outside of embedding square groove 6, not only be favorable to the thermal-insulated heat preservation of furnace body 1 when flexible heat-resistant flashboard 301 will embed square groove 6 and seal, and when flexible heat-resistant flashboard 301 was accomodate in accomodating the groove 7, the thermal-insulated heat preservation performance of furnace body 1 has further been strengthened through flexible heat-resistant flashboard 301, thereby further reduce the heat of furnace 101 heating and waste heat recovery stage furnace 101 and outwards distribute through furnace body 1, not only be favorable to practicing thrift the energy consumption, and avoided leading to furnace body 1 to set up the other bulge that has and accomodate groove 7 because of accomodating of baffle bar heat-resistant board 3011, avoid the increase of furnace body 1 surface area to increase radiating while, be favorable to the pleasing to the eye of furnace body 3011.

Further optimization on the above embodiment is that, vertical groove 601 has all been seted up on the cell wall at the both ends of embedding square groove 6, flexible heat-resisting flashboard 301 is still including the bar connecting plate 3012 of connecting adjacent bar heat-resisting board 3011, the equal slidable mounting in corresponding vertical groove 601 of tip of bar connecting plate 3012 and bar heat-resisting board 3011, come flexible heat-resisting flashboard 301 whole to lead through vertical groove 601, prevent that flexible heat-resisting flashboard 301 from because of bar heat-resisting board 3011 and bar connecting plate 3012 dislocation each other and influencing the closed effect to embedding square groove 6.

And, the both sides of bar connecting plate 3012 all are provided with and supply corresponding bar heat-resistant board 3011 male seal groove 3013 between the board, all seted up a plurality of spacing slide openings 3014 on the inboard cell wall that seal groove 3013 is close to mutually between the board of both sides, sliding plug in installs flexible billet 3015 articulated with corresponding bar heat-resistant board 3011 in spacing slide opening 3014, flexible billet 3015 installs the spacing lug 3016 of outstanding its lateral wall for the one end of bar heat-resistant board 3011, set up on the cell wall of seal groove 3013 between the board and supply spacing lug 3016 slip embedding and both ends closed spacing groove 3017.

The inter-plate sealing groove 3013 is used for inserting the strip heat-resistant plates 3011 when the plurality of strip heat-resistant plates 3011 are stacked, that is, when part of the strip heat-resistant plates 3011 are stored in the storage groove 7 and the embedded square groove 6 is sealed, the strip heat-resistant plates 3011 are inserted into the inter-plate sealing grooves 3013 at the top and bottom of the strip connecting plates 3012, when the height of the flexible heat-resistant shutter 301 is reduced, the flexible heat-resistant shutter 301 forms a whole with two sides isolated from each other by matching with the strip connecting plates 3012 when the embedded square groove 6 is sealed by the plurality of strip heat-resistant plates 3011, so that hot air in the furnace 101 is prevented from permeating into the embedded square groove 6 through a gap at the connection position of the strip heat-resistant plates 3011 and the strip connecting plates 3012, and the heat-resistant effect of the flexible heat-resistant shutter 301 is improved. When the accommodating groove 7 or the plurality of bar-shaped heat blocking plates 3011 embedded in the square groove 6 are driven to rise and pass through the bent connecting passage 8, the upper bar-shaped heat blocking plate 3011 and the bar-shaped heat blocking plate 3011 are hinged by a structure such as a hinge, and the flexible steel bar 3015 which is bendable slides upward relative to the lower unsupported bar-shaped connecting plate 3012, so that the bar-shaped heat blocking plate 3011 is separated from the inter-plate sealing groove 3013 of the bar-shaped connecting plate 3012, and the flexible steel bar 3015 and the hinged connection of the bar-shaped heat blocking plate 3011 and the flexible steel bar 3015 are combined to achieve large-amplitude bending of the whole flexible heat blocking shutter 301, so as to meet the requirement that the flexible heat blocking shutter 301 reciprocates between the accommodating groove 7 and the embedding square groove 6 which are parallel or nearly parallel to each other, and have good heat insulation performance.

The wall of the hearth at the top of the hearth 101 is embedded with a plurality of air outlet pipes 9 distributed at equal intervals, the main air pipe 4 is communicated with the hearth 101 through the air outlet pipes 9, and the heat exchange units 202 on the two sides are symmetrical about the air outlet pipes 9 arranged in a straight line.

The air outlet pipes 9 are arranged at the top of the hearth 101 in a single row or multiple rows, and hot air in the air supply pipeline is blown to the hearth 101 and the heat treatment product below through the air outlet pipes 9, so that the aim of heating the hearth 101 and the heat treatment product is fulfilled.

The heat exchange unit 202 further comprises a hot water pipe 2021, a cold water pipe 2022, a plurality of long copper pipes 2023 and a plurality of bent copper pipes 2024, the plurality of long copper pipes 2023 are connected through the plurality of bent copper pipes 2024 to form a heat exchanger with a circuitous and bent pipeline and communicated end to end, the bent copper pipes 2024 are connected to form a heat exchanger communicated end to end, and the heat exchanger and the heat storage unit 201 conduct heat conduction through flowing media. The cold water pipe 2022 is located below the hot water pipe 2021, the water inlet of the heat exchanger is located below the water outlet, the cold water pipe 2022 is connected with the water inlet of the heat exchanger, and the hot water pipe 2021 is connected with the water outlet of the heat exchanger, so as to meet the flowing rule that the cold water rises and sinks when the hot water flows, and the hot water can flow to the heat storage unit 201 through the hot water pipe 2021 to store heat.

The embodiment is further optimized in that a single-pipe hole 10 for communicating the rear cavity 102 with the embedded square groove 6 and a double-pipe hole 11 for communicating the rear cavity 102 with the hearth 101 are formed in the furnace body 1, heat insulation layers 14 are respectively arranged on the hole walls of the single-pipe hole 10 and the double-pipe hole 11, the cold water pipe 2022 is inserted into the single-pipe hole 10, the hot water pipe 2021 is inserted into the double-pipe hole 11, and the heat insulation layers 14 made of materials with low heat conductivity coefficients such as asbestos prevent the cold water pipe 2022 and the hot water pipe 2021 from exchanging heat with the furnace body 1, so that the absorption of the furnace body 1 to heat is reduced, the water temperature in the cold water pipe 2022 is prevented from rising to influence the water circulation efficiency in the heat exchanger, and the efficiency of the heat exchanger for absorbing waste heat and cooling the hearth 101 is ensured.

In the above embodiment, it is further optimized that one end of the heat exchange efficiency-increasing pipe 12 penetrates into the furnace 101, the other end of the heat exchange efficiency-increasing pipe is connected with the heat exchange pipe 2012, the heat exchange efficiency-increasing pipe 12 and the air inlet pipe 2013 are both connected with the heat exchange pipe 2012 through the electrically controlled valve 13, and one end of the heat exchange pipe 2012, which is opposite to the heat exchange efficiency-increasing pipe 12 and the air inlet pipe 2013, is connected with the plurality of air outlet pipes 9.

Specifically, when waste heat recovery is performed, the reciprocating driving mechanism 302 drives the flexible heat resistance shutter 301 to be embedded into the square groove 6 to be opened, the electric control valve 13 on the air inlet pipe 2013 is closed, the electric control valve 13 on the heat exchange synergistic pipe 12 is switched on, at the moment, along with the starting of the air blowing mechanism 5, the heat exchange synergistic pipe 12 sucks hot air in the hearth 101, the hot air in the heat exchange synergistic pipe 12 directly heats one end, far away from the heat exchanger, of the hot water pipe 2021, the temperature difference of the two ends of the heat exchanger is improved, the flowing of water in the heat exchanger is promoted, the injection efficiency of cold water in the heat exchanger is improved, the heat exchanger keeps a large temperature difference between the internal water of the heat exchanger and the air in the hearth 101, and the heat exchange efficiency of the heat exchanger is improved.

Moreover, when the hot air in the heat exchange synergistic tube 12, which has undergone primary heat exchange with the hot water tube 2021, passes through the heat exchange tube 2012, it again passes through the heat exchange with the heat storage water tank 2011 having a lower temperature, and at this time, the temperature of the air flowing into the furnace 101 through the heat exchange tube 2012, the main air duct 4 and the air outlet tube 9 is greatly reduced, so that the purpose of reducing the temperature of the furnace 101 and the heat-treated product molded in the furnace 101 is promoted.

When waste heat recovery is performed and the hearth 101 needs to be heated, the electric control valve 13 of the air inlet pipe 2013 is switched on, the electric control valve 13 on the heat exchange synergistic pipe 12 is switched off, meanwhile, the reciprocating driving mechanism 302 drives the flexible heat-resistant shutter 301 to seal the embedded square groove 6, and along with the starting of the air blowing mechanism 5, air with low temperature in the hearth 101 sequentially passes through the air inlet pipe 2013 and the heat exchange pipes 2012, is heated by absorbing heat of the heat storage water tank 2011, and flows into the hearth 101 through the main air pipe 4 and the air outlet pipes 9 after being heated, so that the hearth 101 and heat treatment products are heated.

In order to further promote the flow of water flow in the heat exchanger to improve the rate of waste heat recovery, i.e. temperature reduction, the ends of the hot water pipe 2021 and the cold water pipe 2022 connected with the heat exchanger are both arranged obliquely downwards, adjacent long copper pipes 2023 are connected through bent copper pipes 2024 to form flow promoting portions in a V shape, and the cold end of each flow promoting portion close to the cold water pipe 2022 is arranged obliquely upwards to facilitate the oblique upward flow of hot water.

The heat storage unit 201 comprises a heat storage water tank 2011, a heat exchange tube 2012 and an air inlet tube 2013 with one end connected with the heat exchange tube 2012, a cold water tube 2022 and a hot water tube 2021 are both mounted on the heat storage water tank 2011 relative to one end of the heat exchanger, and the heat exchange tube 2012 is spirally and fittingly mounted on the wall of the heat storage water tank 2011. The air inlet pipe 2013 penetrates through the hearth 101 relative to the air inlet end of the heat exchange pipe 2012, and the other end of the heat exchange pipe 2012 relative to the air inlet pipe 2013 and the heat exchange synergistic pipe 12 is connected with the main air duct 4.

The heat exchange tube 2012 is integrally formed on the outer wall of the heat storage water tank 2011, the long copper tube 2023, the bent copper tube 2024, the hot water channel and the heat storage water tank 2011 are all made of materials with high guide coefficients, such as copper and copper alloy, and the long copper tube 2023 and the bent copper tube 2024 heat the heat-conducting media, such as water, inside the heat exchanger by waste heat absorbed by the heat exchanger. The heat conducting medium is exemplified by water, cold water in the heat storage water tank 2011 is supplemented into the heat exchanger through the cold water pipe 2022, heated water in the heat exchanger flows through the hot water pipe 2021 in the heat storage water tank 2011 under the action of the water pressure of the cold water below, so that the temperature of the water in the heat storage water tank 2011 is increased, the water in the heat storage water tank 2011 heats air passing through the heat exchange pipe 2012 through the tank wall of the heat storage water tank 2011, and the heat exchange pipe 2012 is spirally wound on the outer wall of the heat storage water tank 2011 so as to be beneficial to the air in the heat exchange pipe to fully absorb heat through the tank wall of the heat storage water tank 2011. When the blower mechanism 5 is started, air in the sealed hearth 101 is extracted sequentially through the heat exchange pipe 2012 and the air inlet pipe, the extracted air is heated when passing through the heat exchange pipe 2012, and then the air heated by the heat storage water tank 2011 returns to the hearth 101 sequentially through the main air pipe 4 and the air outlet pipes 9, and is circulated and reciprocated to heat the hearth 101 and heat-treated products in the hearth 101 in a primary section.

It should be added that the heat exchange tubes 2012 are preferably arranged in the upper half of the hot water storage tank 2011 or the heat exchange tubes 2012 in the upper half of the hot water storage tank 2011 are wound more densely, that is, the temperature difference between the air in the heat exchange tubes 2012 and the water in the hot water storage tank 2011 is increased, and the time for the air in the heat exchange tubes 2012 to contact with the upper half of the hot water storage tank 2011 with a higher temperature is increased, so as to achieve the purpose of sufficient heat exchange.

In addition, in order to prevent the hot air in the hearth 101 from flowing to the heat exchange tubes 2012 through the air inlet pipe and the heat exchange efficiency increasing pipe 12 in the heating stage and the firing stage, a valve and other parts with the same function are arranged at one ends of the air inlet pipe and the heat exchange efficiency increasing pipe 12 extending into the hearth 101.

In addition, the square grooves 6 embedded in the two sides are symmetrical about the air inlet pipe 2013 and the heat exchange synergistic pipe 12, the end, extending into the hearth 101, of the heat exchange synergistic pipe 12 is located above the end, extending into the hearth 101, of the air inlet pipe 2013, namely, the air inlet ends of the heat exchange synergistic pipe 12 and the air inlet pipe 2013 are located at the end, opposite to the opening of the hearth 101, hot air sprayed downwards from the air outlet pipe 9 above is dispersed to the two sides after colliding with a heat treatment product, and the air inlet pipe arranged at the position of the central line prevents the hot air descending at the two sides from being directly sucked in, so that the heat exchange between the hot air and low-temperature air in the hearth 101 is facilitated, and the preheating or initial heating efficiency of the hearth 101 is improved.

The above embodiments are only exemplary embodiments of the present application, and are not intended to limit the present application, and the protection scope of the present application is defined by the claims. Various modifications and equivalents may be made by those skilled in the art within the spirit and scope of the present application and such modifications and equivalents should also be considered to be within the scope of the present application.

Claims

1. The reciprocating type high-efficiency energy-saving tunnel kiln is characterized by comprising a kiln body (1) with a hearth (101), a rail (15) and a waste heat recovery device (2) arranged in the kiln body (1), wherein two sides of the kiln body (1) are respectively arranged on the rail (15) through a plurality of kiln wheels (16) and reciprocate along the rail (15), at least one oxygen supply pipeline for supplying oxygen to the hearth (101) is arranged between the rails (15) at two sides, and a waste gas discharge pipe (18) communicated with the hearth (101) is arranged at the top of the kiln body (1) relative to the kiln wheels (16);

a rear cavity (102) is formed in one end, opposite to an opening of the hearth (101), of the furnace body (1), the waste heat recovery device (2) comprises a heat storage unit (201) arranged in the rear cavity (102), a heat exchange unit (202) arranged on the inner wall of the hearth (101), and an adjustable heat resistance mechanism (3) used for isolating the heat exchange unit (202) from the hearth (101) when the hearth (101) is heated;

the furnace wall of furnace (101) install one end with furnace (101) intercommunication and the other end is located main tuber pipe (4) in back cavity (102), install blower mechanism (5) on main tuber pipe (4), by the air of heat accumulation unit (201) heating is in under the pump sending of blower mechanism (5) pass through main tuber pipe (4) to carry in furnace (101).

2. The reciprocating high-efficiency energy-saving tunnel kiln as recited in claim 1, wherein the inner walls of the two sides of the furnace (101) are provided with embedded square grooves (6) for the heat exchange units (202) to be embedded, the adjustable heat-resistant mechanism (3) comprises a flexible heat-resistant shutter (301) and a reciprocating driving component (302) for driving the flexible heat-resistant shutter (301), the furnace body (1) is provided with a receiving groove (7), the wall of the embedded square groove (6) is provided with a connecting channel (8) communicated with the receiving groove (7), the connecting channel (8) is located between the heat exchange units (202) on the two sides, and the flexible heat-resistant shutter (301) passes through the connecting channel (8) under the driving of the reciprocating driving component (302) and reciprocates between the embedded square groove (6) and the receiving groove (7) so that the heat exchange units (202) in the receiving groove (7) are isolated from the furnace (101) and exposed in the furnace (101).

3. The reciprocating-moving type high-efficiency energy-saving tunnel kiln according to claim 2, wherein the embedding square groove (6) is positioned between the accommodating grooves (7) at both sides, the embedding square groove (6) is communicated with the accommodating grooves (7) through the connecting channel (8) in an 'n' -shape, the flexible heat-blocking shutter (301) comprises a plurality of bar-shaped heat-blocking plates (3011) which are movably connected in sequence, and the bar-shaped heat-blocking plates (3011) move to the outer side of the embedding square groove (6) when the embedding square groove (6) is opened, so as to enhance the heat-blocking performance of the kiln body (1).

4. The reciprocating high-efficiency energy-saving tunnel kiln according to claim 3, wherein the groove walls at both ends of the embedded square groove (6) are provided with vertical grooves (601), the flexible heat-resistant shutter (301) further comprises bar-shaped connecting plates (3012) connecting the adjacent bar-shaped heat-resistant plates (3011), and the bar-shaped connecting plates (3012) and the bar-shaped heat-resistant plates (3011) are slidably mounted in the corresponding vertical grooves (601);

the both sides of bar connecting plate (3012) all are provided with the confession and correspond seal groove (3013) between bar heat-resisting board (3011) male, both sides all seted up a plurality of spacing slotted holes (3014) on the cell wall of inboard that seal groove (3013) are close to mutually between the board, sliding plug installs in spacing slotted hole (3014) and corresponds bar heat-resisting board (3011) articulated flexible billet (3015), flexible billet (3015) for spacing lug (3016) outstanding in its lateral wall are installed to the one end of bar heat-resisting board (3011), seted up the confession on the cell wall of seal groove (3013) between the board spacing lug (3016) slip embedding and both ends closed spacing groove (3017).

5. The reciprocating-type efficient energy-saving tunnel kiln as claimed in claim 3, wherein a plurality of air outlet pipes (9) are embedded in the wall of the hearth (101) and are distributed at equal intervals, the main air pipe (4) is communicated with the hearth (101) through the air outlet pipes (9), and the heat exchange units (202) on two sides are symmetrical about the air outlet pipes (9) which are arranged in a straight line.

6. The reciprocating type high-efficiency energy-saving tunnel kiln according to claim 5, characterized in that the heat exchange unit (202) comprises a hot water pipe (2021), a cold water pipe (2022), a plurality of long copper pipes (2023) and a plurality of bent copper pipes (2024), the plurality of long copper pipes (2023) are connected through the plurality of bent copper pipes (2024) to form a heat exchanger with a circuitous and curved pipe, the cold water pipe (2022) is positioned below the hot water pipe (2021), the cold water pipe (2022) is connected with the water inlet of the heat exchanger, and the hot water pipe (2021) is connected with the water outlet of the heat exchanger.

7. The reciprocating high-efficiency energy-saving tunnel kiln according to claim 6, characterized in that a single pipe hole (10) for communicating the rear cavity (102) with the embedded square groove (6) and a double pipe hole (11) for communicating the rear cavity (102) with the furnace (101) are formed in the furnace body (1), the wall of each of the single pipe hole (10) and the wall of the double pipe hole (11) are provided with a heat insulation layer (14), the cold water pipe (2022) is inserted into the single pipe hole (10), the hot water pipe (2021) is inserted into the double pipe hole (11), and the double pipe hole (11) is provided with a heat exchange synergistic pipe (12);

one section end of the heat exchange synergistic pipe (12) penetrates into the hearth (101) and the other end of the heat exchange synergistic pipe is connected with the main air pipe (4), and the main air pipe (4) is connected with a plurality of air outlet pipes (9) relative to one ends of the heat exchange synergistic pipe (12) and the air inlet pipe (2013).

8. The reciprocating high-efficiency energy-saving tunnel kiln according to claim 6, characterized in that the ends of the hot water pipe (2021) and the cold water pipe (2022) connected with the heat exchanger are all arranged in a downward inclination manner, the adjacent long copper pipes (2023) are connected through the bent copper pipe (2024) to form a V-shaped flow promoting part, and the cold end of each flow promoting part close to the cold water pipe (2022) is arranged in an upward inclination manner to facilitate the hot water to flow obliquely upward.

9. The energy-efficient reciprocating tunnel kiln according to claim 7, characterized in that the heat storage unit (201) comprises a heat storage water tank (2011), a heat exchange pipe (2012) and an air inlet pipe (2013) with one end connected with the heat exchange pipe (2012), one ends of the cold water pipe (2022) and the hot water pipe (2021) relative to the heat exchanger are both installed on the heat storage water tank (2011), and the heat exchange pipe (2012) is spirally and fittingly installed on the wall of the heat storage water tank (2011);

the heat exchange synergistic tube (12) is connected with the main air pipe (4) through the heat exchange tube (2012), the heat exchange synergistic tube (12) and the air inlet tube (2013) are connected with the heat exchange tube (2012) through an electric control valve (13), the air inlet tube (2013) penetrates through the hearth (101) relative to the air inlet end of the heat exchange tube (2012), and the other end of the heat exchange tube (2012) relative to the air inlet tube (2013) and the heat exchange synergistic tube (12) is connected with the main air pipe (4).

10. The reciprocating high-efficiency energy-saving tunnel kiln according to claim 9, characterized in that the embedded square grooves (6) on two sides are symmetrical about the air inlet pipe (2013) and the heat exchange efficiency increasing pipe (12), and one end of the heat exchange efficiency increasing pipe (12) extending into the hearth (101) is positioned above one end of the air inlet pipe (2013) extending into the hearth (101).