CN112843978B

CN112843978B - Two-way sealed intensification denitrification facility of flue is burnt to danger useless

Info

Publication number: CN112843978B
Application number: CN202011576938.XA
Authority: CN
Inventors: 乔德友; 陶经坚
Original assignee: Shanghai Yude Environment Protection Engineering Co ltd
Current assignee: Shanghai Yude Environmental Protection Co.,Ltd.
Priority date: 2020-12-28
Filing date: 2020-12-28
Publication date: 2021-10-12
Anticipated expiration: 2040-12-28
Also published as: CN112843978A

Abstract

The invention discloses a heating and denitration device for bidirectionally sealing a hazardous waste incineration flue, which comprises a flue gas pipeline, a heating device, a denitration device, a flue bidirectional sealing device and a support frame, wherein the heating device and the denitration device are connected through the flue gas pipeline in a sealing manner, the heating device and the flue bidirectional sealing device are connected through the flue gas pipeline, the heating device is sequentially provided with a steam heater, a flue gas heater and a natural gas heating heater, the steam heater is fixedly connected with the support frame, the steam heater and the flue bidirectional sealing device are connected through the flue gas pipeline in a sealing manner, the flue gas heater is fixedly connected with the flue bidirectional sealing device, and the natural gas heating heater is fixedly connected with the flue gas heater through the flue gas pipeline.

Description

Two-way sealed intensification denitrification facility of flue is burnt to danger useless

Technical Field

The invention relates to the technical field of heating and denitration, in particular to a heating and denitration device for bidirectionally sealing a hazardous waste incineration flue.

Background

With the stricter requirements of the state on the incineration emission of the hazardous wastes, the requirements on the emission of nitrogen oxides and dioxin substances are higher, and therefore, more and more denitration devices are required to be arranged in more and more projects. The catalyst usually has two kinds of high temperature and medium and low temperature, the high temperature is usually designed at the outlet of the dust remover, but the sensitivity to sulfur trioxide is less, the medium and low temperature catalyst is usually selected for the flue gas generated by burning the hazardous waste, and the reaction temperature is between 220 ℃ and 250 ℃. The heating mode of the flue gas is provided with a plurality of modes, one mode is a steam heater, the other mode is a flue gas heater, the third mode is a natural gas heating heater, one or more modes can be selected, the steam pressure of a common boiler of a hazardous waste incineration system is low, the temperature of the steam is lower than 200 ℃, the temperature of the flue gas cannot be increased to 250 ℃ by the steam, and therefore, the combination of the modes is needed. In addition, a single heating mode is adopted, so that the situation that if the heating device fails, the subsequent denitration device cannot normally operate can occur.

When the flue is designed, the design of a bypass flue is often met, and two valves are usually arranged for switching, such as a valve A and a valve B, wherein when the valve A is used for a channel A, the valve A is opened, and the valve B is closed, and when the valve B is used for a channel B, the valve B is opened, and the valve A is closed. If two bypasses are combined, three valves are provided, for example valve a, valve B and valve C, where valve a and valve C are one channel, and when the channel is taken, the two valves are open, valve B is closed, and valve B is the other channel, and when the valve B is taken, the valves a and C are closed. The arrangement is a conventional design method and has several disadvantages, namely that three valves are arranged, namely three actuating mechanisms are arranged, and the failure rate is high; secondly, when the channel A and the channel C are arranged, the channel B on the other side is only provided with one valve, so that the sealing property cannot be ensured, and the leakage is easy.

Disclosure of Invention

The invention aims to provide a heating and denitration device for bidirectionally sealing a hazardous waste incineration flue, which aims to solve the problems in the background technology.

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

the utility model provides a two way seal's of flue intensification denitrification facility is burnt to danger useless, includes flue gas pipeline, rising temperature device, denitrification facility, flue two way seal device and support frame, rising temperature device and denitrification facility pass through flue gas pipeline sealing connection, and rising temperature device and flue two way seal device pass through flue gas pipeline connection, rising temperature device is equipped with steam heater, flue gas heater and natural gas intensification heater in proper order, steam heater and support frame fastening connection, steam heater and flue two way seal device pass through flue gas pipeline sealing connection, flue gas heater and flue two way seal device fastening connection, natural gas intensification heater and flue gas heater pass through flue gas pipeline fastening connection.

Through tertiary intensification device, step by step with the temperature heating to the temperature that denitration reaction needs, furthest has utilized the energy that burns in-process and produce, has reduced loss and emission, has ensured through the cubic intensification that catalytic reaction can't be accomplished when single device damages the drawback, and the branch that vertically and horizontally staggered linked firmly constitutes the support frame and is convenient for follow-up installation and dismantlement maintenance. The deacidified low-temperature flue gas enters a steam heater, heat exchange and temperature rise are carried out through a heat exchange sheet inserted in a steam channel, part of the flue gas after primary temperature rise and heat exchange passes through a flue bidirectional sealing device and flows into a low-temperature flue pipe of the flue gas heater through a flue pipe, a heat exchange layer is arranged between the low-temperature flue pipe and a high-temperature flue pipe, the high-temperature flue gas after denitration reaction flows through the high-temperature flue pipe, heat is transferred into the low-temperature flue pipe from bottom to top through the heat exchange layer to heat the low-temperature flue gas, the flue gas after secondary temperature rise and heat exchange enters a natural gas temperature rise heater through the flue pipe, the flue gas is heated for the third time through a natural gas burner at the bottom end, the flue gas after tertiary heating enters from the upper end of the denitration device through the flue pipe, a built-in double catalyst layer enables the denitration reaction to be more thorough, the emission of pollutants is reduced, and a spare layer is arranged at the bottom end of the denitration device, the double catalyst layers can be started in time when the efficacy is weakened or invalid, the furnace does not need to be shut down for replacement, the high-temperature flue gas after denitration reaction enters the high-temperature flue pipe through a flue gas pipeline, the temperature is reduced through heat exchange, and the flue gas is directly discharged into the air by an induced draft fan; the other part of the smoke is directly discharged from the smoke outlet through the bidirectional flue sealing device, and does not participate in the subsequent two-stage heating. Steam heater and flue gas heater make full use of the useless unnecessary heat that burns the in-process and produce of danger, reduced manufacturing cost, the support frame through criss-cross arrangement is fixed each device, installation cost and installation area have been reduced, connect through flue gas pipeline between each device, can not restrict the mounted position, also be convenient for seal, through flue two-way sealing device, set up two sealing members simultaneously in the passageway, prevent to take place to reveal, cause the pollution.

Furthermore, the steam heater comprises a flue gas inlet pipe, a steam pipeline, a positioning part, a steam heater frame, a heat exchange plate, a fixing lug and a fixing support, a flue gas inlet is arranged at the upper end of the steam heater frame, the flue gas inlet pipe is hermetically connected with the flue gas inlet at the upper end of the steam heater frame, the steam heater frame is fixedly connected with the support frame through the fixing lug, the outer circular surface of the steam heater frame is fixedly connected with the fixing lug, the steam heater frame is fixedly connected with the steam pipeline through the fixing support, the inner surface of the steam heater frame is fixedly connected with the fixing support, the steam pipeline lower surface links firmly with the fixed bolster up end, the lower extreme is equipped with steam outlet pipe and steam in proper order on the steam pipeline and advances the pipe, and steam outlet pipe and steam advance the pipe and pass through the setting element to be fixed at steam heater frame surface, are equipped with steam channel in the middle of the steam pipeline, heat exchanger fin one end is inserted in steam channel.

The flue gas advances the pipe inflow from the flue gas, steam heater flows through, at steam heater shelf location steam pipe, when steam advances the pipe and gets into from below steam, heat the flue gas through the heat exchanger fin, not with flue gas direct contact, prevent to pollute, steam temperature moves the process on and constantly reduces, then discharges from the steam outlet pipe, each spare part passes through fixed connection in the device, because factors such as flue gas impact take place the displacement when preventing to use, influence holistic sealing performance, cause and reveal. The steam flow direction is opposite to the flue gas flow direction, the temperature of the steam flowing out of the secondary heating device is the highest, the temperature of the lower end of the steam is the highest, and the temperature of the flue gas outlet of the steam heater is the highest in the period.

Further, the flue gas heater includes the dead lever, the bracing piece, low temperature tobacco pipe and high temperature tobacco pipe, be equipped with the heat transfer layer between low temperature tobacco pipe and the high temperature tobacco pipe, heat transfer layer bottom and high temperature tobacco pipe top fastening connection, heat transfer layer top and low temperature tobacco pipe bottom fastening connection, the dead lever bottom is fixed with ground, dead lever side upper end and low temperature tobacco pipe side link firmly, dead lever side lower extreme and high temperature tobacco pipe side link firmly, bracing piece bottom and dead lever link firmly, bracing piece upper end and high temperature tobacco pipe lower surface link firmly, low temperature tobacco pipe exit end and intensification heater pass through pipe seal and connect, high temperature tobacco pipe entrance point and denitrification facility exit end pass through flue gas pipeline sealing connection.

The flue gas heater is a secondary heater, flue gas flows into from the smoke inlet pipe port of the flue gas bidirectional sealing device and flows out from the K1 flue gas outlet, and enters the low-temperature smoke pipe of the flue gas heater through the flue gas pipeline, the low-temperature smoke pipe and the high-temperature smoke pipe exchange heat through the heat exchange layer to secondarily heat the flue gas in the low-temperature pipeline, and the heated flue gas flows to the natural gas heating heater through the flue gas pipeline. Because steam heater's export flue gas position is lower, so fix flue gas heater subaerial through the dead lever, the gas flow in the pipeline of being convenient for, the heat transfer layer is convenient for improve heat exchange efficiency through linking firmly with high temperature tobacco pipe and low temperature tobacco pipe, and the high temperature flue gas after the denitration reaction flows through from high temperature tobacco pipe, makes high temperature tobacco pipe shell take place to warp and the displacement easily, supports fixedly through the bracing piece that the bottom was erect.

Further, the natural gas heating heater comprises a heating heater frame, a natural gas burner and a fan, heating furnace, blender and spray gun, natural gas burner ignition side inserts intensification heater frame lower extreme, fan air inlet pipe inserts the intensification heater upper end, fan lower extreme and support frame link firmly, the fan air outlet passes through flue gas pipeline and heating furnace air inlet fastening connection, heating furnace bottom and support frame fastening connection, heating furnace air outlet and blender feed inlet pass through flue gas pipeline and connect, blender bottom and support frame link firmly, blender upper end discharge gate and spray gun pass through flue gas pipeline and connect, natural gas intensification heater and denitrification facility pass through flue gas pipeline sealing connection, intensification heater frame top is equipped with the smoke outlet, intensification heater frame top smoke outlet and flue gas pipeline sealing connection, the spray gun shower nozzle inserts the flue gas pipeline and is close to intensification heater frame one end.

The natural gas heating heater is a third-stage heating device and also a safety device, when the front steam heater is damaged and fails, the smoke can be directly heated without shutdown for maintenance, the smoke heated by the smoke heater for the second time enters the natural gas heating heater through a smoke pipeline, the front two stages are heated by the heat generated in the burning process, the energy consumption is reduced, the third heating is needed to be carried out, the temperature of the denitration reaction is reached, the bottom of the heating heater frame is provided with a natural gas combustion device, the smoke is heated by the heat generated by the combustion of the natural gas, the temperature of the smoke rises more uniformly due to the combustion at the bottom end, the high-temperature smoke rises along the pipeline in the heating heater frame, and as the denitration reaction needs to be catalyzed by adding a nitrogen source which needs to be melted at high temperature, the side surface of a smoke outlet at the upper end of the heating heater frame is provided with an air inlet of a fan, avoid directly heating the cold air, the fan sends the high temperature flue gas to the heating furnace to heat the nitrogen source granule, the nitrogen source granule after melting gets into the blender along with the high temperature flue gas, and carries out intensive mixing in the blender, atomizes through the spray gun, makes in nitrogen source flue gas and the high temperature flue gas mix and pass to denitration reaction device through the pipeline.

Further, denitrification facility includes denitrification facility frame and fixed plywood, and denitrification facility from the top down is equipped with double catalyst layer and reserve layer in proper order, and double catalyst layer and reserve layer are through fixed plywood and denitrification facility frame fastening connection, and the denitrification facility frame is through fixed plywood outer lane and support frame fastening connection.

Catalyze high temperature flue gas through two catalyst layers, improve the catalytic reaction efficiency of flue gas, set up a reserve layer in the lower extreme, prevent that two catalyst layers from becoming invalid and causing the blowing out, when two catalyst layers become invalid, launch reserve layer, avoid not fully reacting the flue gas and directly discharge and cause the pollution in the air, connect the internals through fixed plywood, the dismouting maintenance of being convenient for fixes denitrification facility on the support frame, fixes denitrification facility.

Further, the flue bidirectional sealing device comprises an inlet smoke pipe, a valve body, a first valve plate, a second valve plate, a first valve rod, a second valve rod and a cylinder, the inlet smoke pipe is tightly connected with the valve body, one side plate surface of the first valve plate is fixedly connected with one end of the first valve rod, one end, far away from the first valve plate, of the first valve rod is movably connected with the cylinder, one side plate surface of the second valve plate is fixedly connected with one end of the second valve rod, one end, far away from the second valve plate, of the second valve rod is movably connected with the cylinder, a slide way is arranged in the middle of the first valve rod, the second valve rod penetrates through the slide way in the middle of the first valve rod, the valve body is sequentially provided with a K1 smoke outlet, a K3 smoke outlet, a K4 smoke outlet and a K2 smoke outlet from top to bottom, the K1 smoke outlet is hermetically connected with a low-temperature smoke pipe smoke inlet through a smoke pipe, the K2 smoke outlet is hermetically connected with a high-temperature smoke pipe outlet, the second valve rod penetrates through a K3 smoke outlet, and the K4 smoke pipe are hermetically connected with a smoke pipe, the valve body is internally provided with two valve plate cavities, the peripheral surface of the first valve plate is attached to the inner surface of the valve plate cavity, and the peripheral surface of the second valve plate is attached to the inner surface of the valve plate cavity.

The two-way flue sealing device is formed by combining two three-way valves and is provided with a flue gas inlet and four flue gas outlets, the valve rods are controlled by two cylinders to do reciprocating motion, a valve plate fixedly connected with the valve rods is driven to do reciprocating motion in a valve plate cavity, the peripheral surface of a first valve plate is attached to the inner surface of the valve plate cavity, the peripheral surface of a second valve plate is attached to the inner surface of the valve plate cavity, the valve plate can be sealed to prevent flue gas leakage, when one flue is used, the other flue has a two-layer sealing function, in order to prevent motion interference between the two valve rods, a slide way is arranged on a rod body of the first valve rod, the second valve rod can slide in the slide way of the first valve rod, no valve actuating mechanism is arranged in a channel where the flue gas flows, no air leakage occurs, and strict sealing performance is ensured; only two pneumatic actuators are provided, so that the failure rate is reduced.

The flue gas heated by the steam heater enters the interior of the flue bidirectional sealing device from the inlet flue pipe, when the flue gas needs to be treated, the cylinder controls the valve rod to do reciprocating motion, the first valve plate fixedly connected with the first valve rod moves towards the direction far away from the K1 flue gas outlet along the valve plate cavity, then the internal flue gas channel is sealed, the second valve rod slides along the middle slide way of the first valve rod, the second valve plate fixedly connected with the second valve rod moves towards the position close to the K3 flue gas outlet along the valve plate cavity, and simultaneously the internal flue gas channel is sealed, the low-temperature flue gas flows out from the K1 flue gas outlet, the flue gas heated by the flue gas heater and the natural gas heating heater and then subjected to catalytic reaction by the denitration device enters from the K2 flue gas outlet through the flue gas pipeline, passes through the valve plate cavity, and flows towards the exhaust assembly from the K4 flue gas outlet and is exhausted; when the smoke is not required to be processed continuously, the cylinder controls the first valve rod to move to the position of the K1 smoke outlet until the first valve plate blocks the K1 smoke outlet, the external smoke circulation channel is sealed, the cylinder controls the second valve rod to move in the direction far away from the K3 smoke outlet until the valve plate blocks the K2 smoke outlet, the external smoke circulation channel is sealed secondarily, the smoke enters from the inlet smoke pipe, flows to the K4 smoke outlet through the valve plate cavity and then is directly discharged by the exhaust assembly.

As optimization, the exhaust assembly is arranged at the smoke outlet end of the bidirectional flue sealing device K4, the treated smoke is discharged to the air along a chimney through the induced draft fan, the induced draft fan increases the exhaust efficiency, the smoke is discharged upwards along the vertical direction when being discharged through the chimney, and various sealing devices can prevent the smoke from being leaked and prevent the smoke from polluting the surrounding environment.

Compared with the prior art, the invention has the following beneficial effects: according to the invention, the flue gas which needs to be subjected to catalytic reaction is heated by the three-stage heating device, the flue gas is heated to the temperature required by denitration reaction, the heat generated in the hazardous waste incineration process is effectively utilized, the heating cost is reduced, when the front steam heater fails, the flue gas can be directly heated by the natural gas heating heater, and the problems of incomplete denitration reaction and substandard flue gas emission caused by insufficient temperature are avoided; through a flue sealing device, when the flue gas needs to carry out external treatment, it is sealed through two valve plates with inside flue, when the flue gas can directly discharge, two valve plates seal the outside passage, and double seal prevents that the flue gas from taking place to leak, reduces the fault rate through pneumatic actuator.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic diagram of the general structure of the present invention;

FIG. 2 is a schematic structural view of a bidirectional flue sealing device of the present invention;

FIG. 3 is a schematic diagram of the steam heater configuration of the present invention;

FIG. 4 is a schematic diagram of the flue gas heater configuration of the present invention;

FIG. 5 is a schematic diagram of the natural gas warming heater of the present invention;

FIG. 6 is a schematic view of the structure of the blower, the heating furnace, the mixer and the spray gun of the present invention;

FIG. 7 is a schematic view of a heater according to the present invention in a partial cross-sectional configuration;

FIG. 8 is a schematic view of the denitration apparatus according to the present invention;

in the figure: 1-heating device, 11-steam heater, 111-flue gas inlet pipe, 112-steam pipeline, 1121-steam inlet pipe, 1122-steam outlet pipe, 1123-steam channel, 113-positioning piece, 114-steam heater frame, 115-heat exchange sheet, 116-fixing ear piece, 117-fixing support, 12-flue gas heater, 121-heat exchange layer, 122-fixing rod, 123-supporting rod, 124-low temperature smoke pipe, 125-high temperature smoke pipe, 13-natural gas heating heater, 131-heating heater frame, 132-natural gas burner, 133-fan, 134-heating furnace, 135-mixer, 136-spray gun, 2-denitration device, 21-denitration device frame, 22-double catalyst layer, 23-standby layer, 24-fixed laminate, 3-flue bidirectional sealing device, 31-inlet smoke tube, 32-valve body, 321-K1 smoke outlet, 322-K2 smoke outlet, 323-K3 smoke outlet, 324-K4 smoke outlet, 325-valve plate cavity, 331-first valve plate, 332-second valve plate, 341-first valve rod, 342-second valve rod, 35-cylinder, 4-air exhaust assembly, 41-induced draft fan, 42-chimney and 5-support frame.

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.

The invention provides the technical scheme that:

as shown in figures 1-5, a two way seal's of flue intensification denitrification facility is burnt to danger useless, including flue gas pipeline, rising temperature device 1, denitrification facility 2, two way seal of flue 3 and support frame 5, rising temperature device and denitrification facility 2 pass through flue gas pipeline sealing connection, and rising temperature device 1 and two way seal of flue 3 pass through flue gas pipeline connection, rising temperature device 1 is equipped with steam heater 11, flue gas heater 12 and natural gas heating heater 13 in proper order,

steam heater

11 and 5 fastening connection of support frame, steam heater 11 and two way seal of flue 3 pass through flue gas pipeline sealing connection, flue gas heater 12 and 3 fastening connection of two way seal of flue, natural gas heating heater 13 and flue gas heater 12 pass through flue gas pipeline fastening connection.

Through tertiary intensification device, step by step with the temperature heating to the temperature that denitration reaction needs, furthest has utilized the energy that burns in-process and produce, has reduced loss and emission, has ensured through the cubic intensification that catalytic reaction can't be accomplished when single device damages the drawback, and the branch that vertically and horizontally staggered linked firmly constitutes support frame 5 and is convenient for follow-up installation and dismantlement maintenance. The deacidified low-temperature flue gas enters the steam heater 11, heat exchange and temperature rise are carried out through the heat exchange sheet 115 inserted in the steam channel 1123 and steam, part of the flue gas after primary temperature rise and heat exchange passes through the flue bidirectional sealing device 3 and flows through the flue gas pipeline to enter the low-temperature flue gas pipe 124 of the flue gas heater 12, the heat exchange layer 121 is arranged between the low-temperature flue gas pipe 124 and the high-temperature flue gas pipe 125, the high-temperature flue gas after denitration reaction flows through the high-temperature flue gas pipe 125, heat is transferred into the low-temperature flue gas pipe 124 from bottom to top through the heat exchange layer 121 to heat the low-temperature flue gas, the flue gas after secondary temperature rise and heat exchange enters the natural gas temperature rise heater 13 through the flue gas pipeline, the flue gas is heated for the third time through the natural gas combustor 132 at the bottom, the flue gas after tertiary heating enters from the upper end of the denitration device 2 through the flue gas pipeline, and the built-in double catalyst layer 22 enables the denitration reaction to be more thorough, the emission of pollutants is reduced, the standby layer 23 is arranged at the bottom end of the denitration device 2, the dual catalyst 22 layer on the standby layer can be started in time when the effect is weakened or invalid, the denitration device does not need to be shut down and replaced, high-temperature flue gas after denitration reaction enters the high-temperature flue tube 125 through a flue gas pipeline, the temperature is reduced through heat exchange, and the flue gas is directly discharged into the air through the induced draft fan 41; the other part of the smoke is directly discharged from the smoke outlet through the smoke channel bidirectional sealing device 3 and does not participate in the subsequent two-stage heating. Steam heater 11 and flue gas heater 12 make full use of the useless surplus heat that burns the in-process and produce of danger, manufacturing cost has been reduced, support frame 5 through criss-cross arrangement is fixed each device, installation cost and installation area have been reduced, connect through flue gas pipeline between each device, can not restrict the mounted position, also be convenient for seal, through flue two-way seal device 3, set up two sealing members simultaneously in the passageway, prevent to take place to reveal, cause the pollution.

As shown in fig. 3, the steam heater 11 includes a flue gas inlet 111, a steam pipeline 112, a positioning element 113, a steam heater frame 114, heat exchange fins 115, fixing lugs 116 and a fixing bracket 117, a flue gas inlet is disposed at the upper end of the steam heater frame 114, the flue gas inlet 111 is hermetically connected with the flue gas inlet at the upper end of the steam heater frame 114, the steam heater frame 114 is tightly connected with the supporting frame 5 through the fixing lugs 116, the outer circumferential surface of the steam heater frame 114 is tightly connected with the fixing lugs 116, the steam heater frame 114 is fixedly connected with the steam pipeline 112 through the fixing bracket 117, the inner surface of the steam heater frame 114 is fixedly connected with the fixing bracket 117, the lower surface of the steam pipeline 112 is fixedly connected with the upper end surface of the fixing bracket 117, a steam outlet pipe 1122 and a steam inlet pipe 1121 are sequentially disposed at the upper end and the lower end of the steam pipeline 112, the steam outlet pipe 1122 and the steam inlet pipe 1121 are fixed on the outer surface of the steam heater frame 114 through the positioning element 113, a steam channel 1123 is arranged in the middle of the steam pipeline 112, and one end of the heat exchange plate 115 is inserted in the steam channel 1123.

The flue gas advances tub 111 from the flue gas and flows into, steam heater 11 flows through, install steam pipe 112 on steam heater frame 114, when steam advances tub 1121 from below and enters, heat the flue gas through heat exchanger fin 115, not with flue gas direct contact, prevent the pollution, steam temperature moves the process and constantly reduces on, then discharge from steam outlet pipe 1122, each spare part passes through fixed connection in the device, because factors such as flue gas impact take place the displacement during the prevention use, influence holistic sealing performance, cause and reveal. The steam flow direction is opposite to the flue gas flow direction, so that the temperature of the steam flowing out of the secondary heating device is the highest, the temperature of the lower end of the steam is the highest, and the temperature of the flue gas outlet of the steam heater 11 is the highest in the period.

As shown in fig. 4, the flue gas heater 12 includes a fixing rod 122, a supporting rod 123, a low-temperature flue tube 124 and a high-temperature flue tube 125, a heat exchanging layer 121 is disposed between the low-temperature flue tube 124 and the high-temperature flue tube 125, the bottom end of the heat exchanging layer 121 is fastened and connected with the top end of the high-temperature flue tube 125, the top end of the heat exchanging layer 121 is fastened and connected with the bottom end of the low-temperature flue tube 124, the bottom end of the fixing rod 122 is fixed to the ground, the upper end of the side surface of the fixing rod 122 is fixedly connected with the side surface of the low-temperature flue tube 124, the lower end of the side surface of the fixing rod 121 is fixedly connected with the side surface of the high-temperature flue tube 125, the bottom end of the supporting rod 123 is fixedly connected with the lower surface of the high-temperature flue tube 125, the outlet end of the low-temperature flue tube 124 is connected with the temperature-rising heater 13 through a pipe seal, and the inlet end of the high-temperature flue tube 125 is connected with the outlet of the denitration device 2 through a flue gas pipe seal.

The flue gas heater 12 is a two-stage heater, flue gas flows in from the smoke inlet pipe mouth 31 of the flue gas two-way sealing device 3 and flows out from the K1 flue gas outlet 321, and enters the low-temperature smoke pipe 124 of the flue gas heater 12 through the flue gas pipeline, the low-temperature smoke pipe 124 and the high-temperature smoke pipe 125 exchange heat through the heat exchange layer 121, the flue gas in the low-temperature pipeline 124 is heated secondarily, and the heated flue gas flows to the natural gas temperature-rising heater 13 through the flue gas pipeline. Because the outlet flue gas position of the steam heater 11 is lower, the flue gas heater 12 is fixed on the ground through the fixing rod 122, so that the gas in the pipeline can flow conveniently, the heat exchange layer 121 is fixedly connected with the high-temperature flue tube 125 and the low-temperature flue tube 124, so that the heat exchange efficiency can be improved, the high-temperature flue gas after the denitration reaction flows through the high-temperature flue tube 125, the shell of the high-temperature flue tube 125 is easy to deform and displace, and the high-temperature flue gas is supported and fixed through the supporting rod 123 erected at the bottom end.

As shown in fig. 5 to 7, the natural gas temperature-increasing heater 13 includes a temperature-increasing heater frame 131, a natural gas burner 132, a fan 133, a heating furnace 134, a mixer 135 and a spray gun 136, the ignition side of the natural gas burner 132 is inserted into the lower 131 end of the temperature-increasing heater frame, the air inlet pipe mouth of the fan 133 is inserted into the upper end of the temperature-increasing heater 13, the lower end of the fan 133 is fixedly connected with the support frame 5, the air outlet of the fan 133 is fixedly connected with the air inlet of the heating furnace 134 through a flue gas pipe, the bottom end of the heating furnace 134 is fixedly connected with the support frame 5, the air outlet of the heating furnace 134 is connected with the feed inlet of the mixer 135 through a flue gas pipe, the bottom end of the mixer 135 is fixedly connected with the support frame 5, the discharge outlet at the upper end of the mixer 135 is connected with the spray gun 136 through a flue gas pipe, the natural gas temperature-increasing heater 13 is hermetically connected with the denitration device 2 through a flue gas pipe, the top end of the temperature-increasing heater frame 131 is provided with a flue gas outlet hole hermetically connected with the flue gas pipe, the spray head of the spray gun 136 is inserted into one end of the flue gas pipeline close to the heating heater frame 131.

The natural gas heating heater 13 is a third-stage heating device and also a safety device, when the front steam heater 11 is damaged and fails, the smoke can be directly heated without shutdown for maintenance, the smoke heated by the smoke heater 12 for the second time enters the natural gas heating heater 13 through a smoke pipeline, the front two stages are heated by the heat generated in the burning process, the energy consumption is reduced, the smoke needs to be heated for the third time to the temperature of the denitration reaction, a natural gas combustion device 132 is arranged at the bottom of the heating heater frame 131, the smoke is heated by the heat generated by the combustion of the natural gas, the smoke temperature rises more uniformly due to the combustion at the bottom end, the high-temperature smoke rises along the inner pipeline of the heating heater frame 131, a nitrogen source needs to be added for catalytic reaction due to the denitration reaction, the nitrogen source needs to be melted at high temperature, and therefore, an air inlet of a fan is arranged on the side surface of a smoke outlet at the upper end of the heating heater frame 131, avoid directly heating cold air, fan 133 sends the high temperature flue gas to heating furnace 134 to heat the nitrogen source granule, the nitrogen source granule after melting gets into blender 135 along with the high temperature flue gas, and carries out intensive mixing in blender 135, atomizes through spray gun 136, makes in nitrogen source flue gas and the high temperature flue gas mix and pass through the pipeline and reach denitration reaction device 2.

As shown in fig. 8, the denitration device 2 includes a denitration device frame 21 and a fixing layer plate 24, the denitration device 2 is provided with a double catalyst layer 22 and a standby layer 23 in sequence from top to bottom, the double catalyst layer 22 and the standby layer 23 are fastened and connected with the denitration device frame 21 through the fixing layer plate 24, and the denitration device frame 21 is fastened and connected with the support frame 5 through an outer ring of the fixing layer plate 24.

Catalyze high temperature flue gas through two catalyst layers 22, the catalytic reaction efficiency of flue gas is improved, set up a reserve layer 23 in the lower extreme, prevent that two catalyst layers 22 from becoming invalid and causing the blowing out, when two catalyst layers 22 become invalid, launch reserve layer 23, avoid not fully reacting the flue gas and directly discharge and cause the pollution in the air, connect internal member through fixed plywood 24, the dismouting maintenance of being convenient for, fix denitrification facility 2 on support frame 5, fix denitrification facility 2.

As shown in fig. 1-2, the bidirectional flue sealing device 3 includes an inlet smoke tube 31, a valve body 32, a first valve plate 331, a second valve plate 332, a first valve rod 341, a second valve rod 342, and a cylinder 35, the inlet smoke tube 31 is fastened to the valve body 32, one side plate of the first valve plate 33 is fixedly connected to one end of the first valve rod 341, which is far from the first valve plate 331, is movably connected to the cylinder 35, one side plate of the second valve plate 332 is fixedly connected to one end of the second valve rod 342, which is far from the second valve plate 332, is movably connected to the cylinder 35, a slide way is provided in the middle of the first valve rod 341, the second valve rod 342 passes through the slide way in the middle of the first valve rod 341, the valve body 32 is sequentially provided with a K1 smoke outlet 321, a K3 smoke outlet 323, a K4 smoke outlet 324, and a K2 smoke outlet 322, the K1 smoke outlet 321 and a low temperature smoke tube 124 are hermetically connected to a smoke outlet 322, the K2 smoke tube 125 is hermetically connected to a smoke outlet through a smoke tube, the second valve rod 341 passes through the smoke outlet 323 of K3, the smoke outlet 324 of K4 is connected with the smoke pipeline in a sealing way, two valve plate cavities 325 are arranged inside the valve body 32, the peripheral surface of the first valve plate 331 is attached to the inner surface of the valve plate cavity 325, and the peripheral surface of the second valve plate 332 is attached to the inner surface of the valve plate cavity 325.

The two-way flue sealing device 3 is formed by combining two three-way valves and is provided with a flue gas inlet and four flue gas outlets, the valve rod is controlled by two cylinders 35 to do reciprocating motion, a valve plate fixedly connected with the valve rod is driven to do reciprocating motion in a valve plate cavity 325, the peripheral surface of a first valve plate 331 is attached to the inner surface of the valve plate cavity 325, the peripheral surface of a second valve plate 332 is attached to the inner surface of the valve plate cavity 325, so that the valve plates can be sealed to prevent flue gas leakage, when one flue is used, the other flue has a two-layer sealing function, in order to prevent the motion interference between the two valve rods, a slide way is arranged on the rod body of the first valve rod 341, the second valve rod 342 can slide in the slide way of the first valve rod 341, a valve actuating mechanism is not arranged in a channel where the flue gas flows, no air leakage occurs, and strict sealing performance is ensured; only two pneumatic actuators are provided, so that the failure rate is reduced.

The flue gas heated by the steam heater 11 enters the flue bidirectional sealing device 32 from the inlet smoke pipe 31, when the smoke needs to be treated, the cylinder 35 controls the valve rod to do reciprocating motion, the first valve plate 331 fixedly connected with the first valve rod 341 moves along the valve plate cavity 325 towards the direction far away from the smoke outlet 321 of the K1, then the internal flue gas channel is sealed, the second valve stem 342 slides along the first valve stem 341 mid-way, the second valve plate 332 fixedly connected to the second valve rod 342 is moved along the valve plate chamber 325 to a position close to the flue gas outlet 323 of K3, meanwhile, the internal flue gas channel is sealed, low-temperature flue gas flows out from a K1 flue gas outlet 321, is heated by a flue gas heater 12 and a natural gas heating heater 13, then enters from a K2 flue gas outlet 322 through a flue gas pipeline after being subjected to catalytic reaction by a denitration device 2, passes through a valve plate cavity 325, and flows from a K4 flue gas outlet 324 to an exhaust assembly 4 to be exhausted; when the smoke does not need to be treated continuously, the cylinder 35 controls the first valve rod 341 to move to the position of the smoke outlet 321 of the K1 until the first valve plate 331 blocks the smoke outlet 321 of the K1 to seal the external smoke circulation channel, the cylinder 35 controls the second valve rod 342 to move in the direction away from the smoke outlet 323 of the K3 until the second valve plate 332 blocks the smoke outlet 322 of the K2 to seal the external smoke circulation channel for the second time, the smoke enters from the smoke inlet pipe 31, flows to the smoke outlet 324 of the K4 through the smoke outlet 323 of the K3 and is directly discharged by the exhaust assembly 4.

As shown in fig. 1, the exhaust assembly 4 is arranged at the end of the K4 smoke outlet 324 of the bidirectional flue sealing device 3, the treated smoke is exhausted to the air along the chimney 42 through the induced draft fan 41, the induced draft fan 41 increases the exhaust efficiency, the smoke is exhausted upwards along the vertical direction through the chimney 42, and various sealing devices can prevent the smoke from leaking and prevent the smoke from polluting the surrounding environment.

The working principle of the invention is as follows: adopt tertiary rising temperature equipment 1, divide the cubic to heat the flue gas, preceding twice use steam heater 11 and flue gas heater 12, make full use of the heat that burns in-process production and tentatively heat the flue gas, then heat the flue gas to the required temperature of denitration reaction through natural gas rising temperature heater 13, and carry the flue gas after tertiary heating among the denitrification facility 2, the high temperature flue gas after will reacting carries out the heat transfer through high temperature tobacco pipe 125 and low temperature tobacco pipe 124 of flue gas heater 12 earlier, utilize natural gas rising temperature equipment 13 directly to heat the flue gas when steam heater 11 breaks down. The two-way flue sealing device 3 is provided with an inner flue and an outer flue, and when one flue is communicated, the two-way sealing of the other flue is realized by changing the positions of the valve plate and the flue gas outlet.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a two-way sealed intensification denitrification facility of useless incineration flue of danger which characterized in that: the heating and denitration device comprises a flue gas pipeline, a heating device (1), a denitration device (2), a flue bidirectional sealing device (3) and a support frame (5), the temperature rising device (1) is connected with the denitration device (2) in a sealing way through a flue gas pipeline, the temperature rising device (1) is connected with the flue bidirectional sealing device (3) through the flue gas pipeline, the temperature rising device (1) is sequentially provided with a steam heater (11), a flue gas heater (12) and a natural gas temperature rising heater (13), the steam heater (11) is tightly connected with the support frame (5), the steam heater (11) is connected with the flue bidirectional sealing device (3) in a sealing way through a flue gas pipeline, the flue gas heater (12) is tightly connected with the flue bidirectional sealing device (3), the natural gas heating heater (13) and the flue gas heater (12) are fixedly connected through a flue gas pipeline;

the flue gas heater (12) comprises a fixed rod (122), a support rod (123), a low-temperature flue pipe (124) and a high-temperature flue pipe (125), a heat exchange layer (121) is arranged between the low-temperature smoke pipe (124) and the high-temperature smoke pipe (125), the bottom end of the heat exchange layer (121) is fastened and connected with the top end of the high-temperature smoke pipe (125), the top end of the heat exchange layer (121) is fastened and connected with the bottom end of the low-temperature smoke pipe (124), the bottom end of the fixed rod (122) is fixed with the ground, the upper end of the side surface of the fixed rod (122) is fixedly connected with the side surface of the low-temperature smoke tube (124), the lower end of the side surface of the fixed rod (122) is fixedly connected with the side surface of the high-temperature smoke tube (125), the bottom end of the supporting rod (123) is fixedly connected with the fixed rod (122), the upper end of the supporting rod (123) is fixedly connected with the lower surface of the high-temperature flue pipe (125), the outlet end of the low-temperature smoke pipe (124) is hermetically connected with the warming heater (13) through a pipeline, the inlet end of the high-temperature smoke pipe (125) is hermetically connected with the outlet end of the denitration device (2) through a smoke pipeline;

the two-way flue sealing device (3) comprises an inlet smoke pipe (31), a valve body (32), a first valve plate (331), a second valve plate (332), a first valve rod (341), a second valve rod (342) and a cylinder (35), wherein the inlet smoke pipe (31) is fixedly connected with the valve body (32), one side plate face of the first valve plate (331) is fixedly connected with one end of the first valve rod (341), one end, far away from the first valve plate (331), of the first valve rod (341) is movably connected with the cylinder (35), one side plate face of the second valve plate (332) is fixedly connected with one end of the second valve rod (342), one end, far away from the second valve plate (332), of the second valve rod (342) is movably connected with the cylinder (35), a slide way is arranged in the middle of the first valve rod (341), the second valve rod (342) penetrates through the middle slide way of the first valve rod (341), and the valve body (32) is sequentially provided with a K1 smoke outlet (321), K3 exhanst gas outlet (323), K4 exhanst gas outlet (324) and K2 exhanst gas outlet (322), K1 exhanst gas outlet (321) and low temperature tobacco pipe (124) advance the mouth and pass through flue gas pipeline sealing connection, K2 exhanst gas outlet and high temperature tobacco pipe outlet pass through flue gas pipeline sealing connection, K3 exhanst gas outlet (323) is passed in second valve rod (342), K4 exhanst gas outlet (324) and flue gas pipeline sealing connection, valve body (32) inside is equipped with two valve plate chambeies (325), surface and valve plate chamber (325) interior surface laminating around first valve plate (331), surface and valve plate chamber (325) interior surface laminating around second valve plate (332).

2. The bi-directional sealed heating and denitration device for the hazardous waste incineration flue as claimed in claim 1, characterized in that: the steam heater (11) comprises a flue gas inlet pipe (111), a steam pipeline (112), a positioning piece (113), a steam heater frame (114), a heat exchange plate (115), a fixing lug piece (116) and a fixing support (117), wherein a flue gas inlet is formed in the upper end of the steam heater frame (114), the flue gas inlet pipe (111) and the flue gas inlet at the upper end of the steam heater frame (114) are in sealing connection, the steam heater frame (114) and a support frame (5) are in fastening connection through the fixing lug piece (116), the outer circular surface of the steam heater frame (114) is in fastening connection with the fixing lug piece (116), the steam heater frame (114) and the steam pipeline (112) are in fixed connection through the fixing support (117), the inner surface of the steam heater frame (114) is in fixed connection with the fixing support (117), and the lower surface of the steam pipeline (112) is fixedly connected with the upper end surface of the fixing support (117), the steam heating device is characterized in that a steam outlet pipe (1122) and a steam inlet pipe (1121) are sequentially arranged at the upper end and the lower end of the steam pipeline (112), the steam outlet pipe (1122) and the steam inlet pipe (1121) are fixed on the outer surface of the steam heater frame (114) through positioning pieces (113), a steam channel (1123) is arranged in the middle of the steam pipeline (112), and one end of each heat exchange fin (115) is inserted into the steam channel (1123).

3. The bi-directional sealed heating and denitration device for the hazardous waste incineration flue as claimed in claim 1, characterized in that: natural gas intensification heater (13) is including intensification heater frame (131), natural gas combustor (132), fan (133), heating furnace (134), blender (135) and spray gun (136), natural gas combustor (132) ignition side inserts intensification heater frame (131) lower extreme, fan (133) air inlet pipe mouth inserts intensification heater (13) upper end, and fan (133) lower extreme and support frame (5) link firmly, and fan (133) air outlet passes through flue gas pipeline and heating furnace (134) air inlet fastening connection, heating furnace (134) bottom and support frame (5) fastening connection, heating furnace (134) air outlet and blender (135) feed inlet pass through flue gas pipeline connection, blender (135) bottom and support frame (5) link firmly, and blender (135) upper end discharge gate and spray gun (136) pass through flue gas pipeline connection, natural gas intensification heater (13) and denitrification facility (2) pass through flue gas pipeline sealing connection, intensification heater frame (131) top is equipped with the smoke outlet, intensification heater frame (131) top smoke outlet and flue gas pipeline sealing connection, spray gun (136) shower nozzle inserts the flue gas pipeline and is close to intensification heater frame (131) one end.

4. The bi-directional sealed heating and denitration device for the hazardous waste incineration flue as claimed in claim 1, characterized in that: denitration device (2) are equipped with two catalyst layer (22) and reserve layer (23) including denitration device frame (21) and fixed plywood (24) from the top down in proper order, denitration device (2), two catalyst layer (22) and reserve layer (23) are through fixed plywood (24) and denitration device frame (21) fastening connection, denitration device frame (21) are through fixed plywood (24) outer lane and support frame (5) fastening connection.

5. The bi-directional sealed heating and denitration device for the hazardous waste incineration flue as claimed in claim 1, characterized in that: the utility model discloses a denitration device, including intensification denitrification facility, intensification denitrification facility still includes exhaust subassembly (4), exhaust subassembly (4) and flue two-way sealing device (3) pass through flue gas pipeline sealing connection, exhaust subassembly (4) including draught fan (41) and chimney (42), draught fan (41) advance mouth of cigarette and K4 exhanst gas outlet (324) pass through flue gas pipeline sealing connection, and draught fan (41) bottom is arranged in subaerially, chimney (42) and draught fan (41) air inlet end fastening connection.