CN214582400U - Energy-saving low-emission vertical heating furnace for heating medium-high pressure air - Google Patents

Energy-saving low-emission vertical heating furnace for heating medium-high pressure air Download PDF

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Publication number
CN214582400U
CN214582400U CN202120532845.0U CN202120532845U CN214582400U CN 214582400 U CN214582400 U CN 214582400U CN 202120532845 U CN202120532845 U CN 202120532845U CN 214582400 U CN214582400 U CN 214582400U
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heat exchanger
pressure air
high pressure
energy
medium
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CN202120532845.0U
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Inventor
余江游
秦凤华
武斌
高阳
徐少春
周圣亮
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Wisdri Wuhan Thermal Industry Co ltd
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Wisdri Wuhan Thermal Industry Co ltd
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Abstract

The utility model discloses an energy-conserving, low vertical heating furnace that discharges for well high-pressure air heating, the inside of heating furnace body distributes along the inner wall has radiant tube bank, upper and lower part do not installs upper and lower annular pipe case, top and connectThere is the one-level heat exchanger, the gas nozzle of flue gas backward flow formula is installed to the bottom, the one-level heat exchanger up has connected gradually second grade heat exchanger and chimney through the pipeline, annular pipe case about the port inserts respectively about the radiation tube bank, lower annular pipe case entry inserts medium-high pressure air, the one-level heat exchanger shell side leads to medium-high pressure air and the entry passes through the connecting pipe and inserts upper annular pipe case, the flue gas is led to the one-level heat exchanger shell side, the second grade heat exchanger tube side leads to combustion-supporting wind and the import is connected with combustion-supporting fan through the cold blast pipe, the export passes through the hot-blast main and inserts the gas nozzle, the second grade heat exchanger shell side leads to the flue gas, the upper portion of chimney is equipped with the flue baffle that has actuating mechanism, the lower part inserts the gas nozzle through the back flow that has high temperature circulating fan. The utility model is energy-saving and NOxThe discharge is low.

Description

Energy-saving low-emission vertical heating furnace for heating medium-high pressure air
Technical Field
The utility model relates to a vertical heating furnace, concretely relates to energy-conserving, low vertical heating furnace that discharges for well high-pressure air heating.
Background
The vertical heating furnace is widely used in the industrial fields of metallurgy, chemical engineering and the like, and is used for heating medium-high pressure air to the temperature required by the process. The vertical heating furnace in the current market still has certain defects in the design and use processes, and mainly has the following aspects: 1) the heat efficiency is low-the smoke exhaust temperature of the chimney is higher, the smoke is directly discharged after passing through the radiation and convection heat exchange section, and the waste heat of the smoke is not effectively utilized; 2) the existing low-nitrogen combustion technologies such as staged combustion, hearth flue gas internal circulation and the like cannot effectively reduce the temperature of the flame root, so that the discharged NO is difficult to be dischargedxThe concentration is reduced to 80mg/Nm3The following.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing an energy-conserving, low vertical heating furnace that discharges for well high-pressure air heating, the utility model discloses simple to operate, energy-conservation, NOxThe discharge concentration is less than 50mg/Nm3It is suitable for heating medium and high pressure air.
The utility model adopts the technical proposal that:
the energy-saving low-emission vertical heating furnace comprises a heating furnace body, wherein a radiation tube bundle is distributed in the heating furnace body along the inner wall, an upper annular tube box and a lower annular tube box are respectively arranged at the upper part and the lower part of the heating furnace body, a first-stage heat exchanger is connected at the top part of the heating furnace body, a flue gas reflux type gas burner is arranged at the bottom part of the heating furnace body, a second-stage heat exchanger and a chimney are sequentially connected with the first-stage heat exchanger through a pipeline upwards, the upper end and the lower end of the radiation tube bundle are respectively connected into the upper annular tube box and the lower annular tube box, medium-high pressure air is connected into the inlet of the lower annular tube box, medium-high pressure air is connected into the shell pass of the first-stage heat exchanger, flue gas is introduced into the tube pass of the second-stage heat exchanger, combustion-supporting air is connected with a combustion-supporting fan through a cold air pipe, the outlet of the second-stage heat exchanger is connected into the gas burner through a hot air pipe, flue baffle with an actuating mechanism, the flue gas is introduced into the shell pass of the second-stage heat exchanger, and the chimney is provided with a flue baffle plate, The lower part is connected with a gas burner through a return pipe with a high-temperature circulating fan.
Further, the heating furnace body is in a vertical cylindrical shape, the outer wall of the heating furnace body is provided with a steel structure layer, and the inner wall of the heating furnace body is provided with a refractory ceramic fiber module heat insulation layer.
Furthermore, an access door is arranged on the heating furnace body.
Furthermore, the inner wall of the heating furnace body is hung with the radiation tube bundle through a fixed hook.
Furthermore, a plurality of radiant tube bundles are distributed along the inner wall of the heating furnace body, a single radiant tube bundle is bent forwards in a shape like a Chinese character 'ji' from a lower port, then bent backwards in a shape like a Chinese character 'ji' upwards and until to an upper port, and the upper port and the lower port of the radiant tube bundle are in the same vertical row.
Furthermore, the primary heat exchanger is of a shell-and-tube structure, and a lower tube plate of a tube pass of the primary heat exchanger is directly connected with the heating furnace body.
Furthermore, a plurality of baffle plates are arranged in the shell pass of the primary heat exchanger.
Furthermore, an expansion joint is arranged on the shell side of the primary heat exchanger.
Furthermore, the secondary heat exchanger adopts a square tube type structure, the top of the secondary heat exchanger is connected with the cylindrical chimney through a pipeline below the upper circle, and the bottom of the secondary heat exchanger is connected with the cylindrical primary heat exchanger through a pipeline above the lower circle.
Furthermore, the tube pass of the secondary heat exchanger is horizontally arranged, and the inlet and the outlet are on the same side.
The utility model has the advantages that:
the utility model discloses simple to operate, energy-conserving, NOxThe discharge concentration is less than 50mg/Nm3The high-pressure air preheating furnace is suitable for heating of medium-high pressure air during operation, fuel gas, preheated combustion-supporting air and backflow flue gas are burnt in the heating furnace body after entering the fuel gas burner to generate high-temperature flue gas, the flue gas exchanges heat with the radiation tube bundle in the hearth firstly to heat the medium-high pressure air to the design process temperature, then the flue gas enters the primary heat exchanger to preliminarily heat the medium-high pressure air, meanwhile, the temperature of the flue gas is greatly reduced, then the flue gas enters the secondary heat exchanger to preheat the combustion-supporting air by utilizing waste heat, the energy-saving purpose is achieved, finally, one part of the flue gas is directly discharged through natural draft of a chimney, the other part of the flue gas is forced to flow back to the fuel gas burner through the high-temperature circulating fan to be premixed with air, the temperature of flame is effectively reduced, and NO is reducedxGeneration of NOxIs less than 50mg/Nm3
Drawings
Fig. 1 is a schematic structural diagram of an energy-saving and low-emission vertical heating furnace for heating medium-high pressure air in the embodiment of the present invention.
Fig. 2 is a sectional view taken along line a of fig. 1.
Fig. 3 is a schematic view of the structure of a single radiant tube bundle in the present invention.
In the figure: 1-a chimney; 2-a flue damper with an actuating mechanism; 3-a pipeline below the upper circle; 4-a secondary heat exchanger; 5-a pipeline with an upper part and a lower part; 6, a cold air pipe; 7-hot air pipes; 8-a primary heat exchanger; 9-baffle plate; 10-an expansion joint; 11-an upper ring channel; 12-a furnace body; 13-an access door; 14-a lower ring channel; 15-combustion-supporting fan; 16-a connecting tube; 17-a radiant tube bundle; 18-a return pipe; 19-fixing the hook; 20-refractory ceramic fiber modules; 21-a gas burner; 22-high temperature circulating fan; a-a medium-high pressure air inlet; b-medium and high pressure air outlet.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and examples.
As shown in figure 1, an energy-saving and low-emission vertical heating furnace for heating medium-high pressure air comprises a heating furnace body 12, wherein a radiation tube bundle 17 is distributed in the heating furnace body 12 along the inner wall, upper and lower annular tube boxes (11 and 14) are respectively installed at the upper part and the lower part, a first-stage heat exchanger 8 is connected at the top, a flue gas reflux type gas burner 21 is installed at the bottom, a second-stage heat exchanger 4 and a chimney 1 are sequentially connected with the first-stage heat exchanger 8 upwards through a pipeline, the upper and lower ports of the radiation tube bundle 17 are respectively connected into the upper and lower annular tube boxes (11 and 14), the inlet of the lower annular tube box 14 is connected into medium-high pressure air, the inlet of the first-stage heat exchanger 8 is communicated with the medium-high pressure air, the inlet of the first-stage heat exchanger 8 is connected into the upper annular tube box 11 through a connecting pipe 16, the pipe side of the first-stage heat exchanger 8 is communicated with flue gas, the pipe side of the second-stage heat exchanger 4 is communicated with combustion-supporting air, the inlet of the second-supporting fan 15 is connected with a combustion-supporting fan through a cold air pipe 6, and the outlet of the hot-air burner 21 is connected through a hot air pipe 7, the shell pass of the secondary heat exchanger 4 is communicated with flue gas, the upper part of the chimney 1 is provided with a flue baffle 2 with an actuating mechanism, and the lower part is connected with a gas burner 21 through a return pipe 18 with a high-temperature circulating fan 22.
As shown in fig. 1 and 2, in this embodiment, the heating furnace body 12 is a vertical cylinder, the outer wall of the heating furnace body 12 is a steel structure layer, and the inner wall of the heating furnace body 12 is a refractory ceramic fiber module 20 insulating layer, so that the heating furnace body 12 has high structural strength, is high temperature resistant, and is durable.
As shown in fig. 1, in the present embodiment, an access door 13 is provided on the furnace body 12 to facilitate maintenance when the furnace is shut down.
As shown in FIG. 1, in this embodiment, the radiant tube bundle 17 is suspended from the inner wall of the furnace body 12 by the fixing hooks 19, and the radiant tube bundle 17 is easy to install. In this embodiment, as shown in fig. 2, a plurality of radiant tube bundles 17 are distributed along the inner wall of the heating furnace body 12, as shown in fig. 3, a single radiant tube bundle 17 is bent forward in a shape like a Chinese character 'ji' from the lower port, and then bent backward in a shape like a Chinese character 'ji' upward and until reaching the upper port, and the upper and lower ports of the radiant tube bundle 17 are in the same vertical row, which facilitates installation, improves heat exchange efficiency and realizes uniform heat exchange.
As shown in fig. 1, in this embodiment, the primary heat exchanger 8 is of a shell-and-tube structure, and a lower tube plate of a tube pass of the primary heat exchanger 8 is directly connected to the heating furnace body 12, so that equipment replacement is facilitated.
As shown in fig. 1, in this embodiment, a plurality of baffles 9 are disposed in the shell side of the primary heat exchanger 8 to enable the medium-high pressure air and the flue gas to exchange heat sufficiently.
As shown in fig. 1, in this embodiment, an expansion joint 10 is disposed on the shell side of the primary heat exchanger 8, so as to improve the safety of use and avoid damage due to excessive heating.
As shown in fig. 1, in the present embodiment, the secondary heat exchanger 4 has a square tubular structure, the top of the secondary heat exchanger 4 is connected to the cylindrical chimney 1 through the upper and lower pipes 3, and the bottom of the secondary heat exchanger 4 is connected to the cylindrical primary heat exchanger 8 through the upper and lower pipes 5.
As shown in fig. 1, in this embodiment, the tube pass of the secondary heat exchanger 4 is horizontally arranged, and the inlet and the outlet are on the same side, which is convenient for installation and pipeline arrangement.
The utility model discloses simple to operate, energy-conserving, NOxThe discharge concentration is less than 50mg/Nm3The high-pressure air preheating furnace is suitable for heating of middle-high pressure air during operation, fuel gas, preheated combustion-supporting air and backflow flue gas enter a fuel gas burner 21 and then are combusted in a heating furnace body 12 to generate high-temperature flue gas, the flue gas exchanges heat with a radiation tube bundle 17 in a hearth firstly to heat the middle-high pressure air to a design process temperature, then the flue gas enters a primary heat exchanger 8 to primarily heat the middle-high pressure air, the temperature of the flue gas is greatly reduced, then the flue gas enters a secondary heat exchanger 4 to preheat the combustion-supporting air by using waste heat, the energy-saving purpose is achieved, finally, one part of the flue gas is directly discharged through natural draft of a chimney 1, and the other part of the flue gas is forced to flow back to the fuel gas burner 21 through a high-temperature circulating fan 22 and is premixed with air, so that the temperature of the root of the flame is effectively reduced, NO is reducedxGeneration of NOxIs less than 50mg/Nm3
It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are intended to be included within the scope of the invention as defined in the appended claims.

Claims (10)

1. The utility model provides an energy-conserving, low emission vertical furnace for well high-pressure air heating which characterized in that: comprises a heating furnace body, wherein a radiation tube bundle is distributed in the heating furnace body along the inner wall, an upper annular tube box and a lower annular tube box are respectively arranged at the upper part and the lower part, a first-stage heat exchanger is connected at the top part, the gas nozzle of flue gas backward flow formula is installed to the bottom, the one-level heat exchanger has up connected gradually second grade heat exchanger and chimney through the pipeline, annular pipe case about the port inserts respectively about the radiant tube bank, lower annular pipe case entry inserts medium-high pressure air, the one-level heat exchanger shell side leads to medium-high pressure air and the entry inserts annular pipe case through the connecting pipe, the flue gas is led to the one-level heat exchanger shell side, the second grade heat exchanger shell side leads to combustion-supporting wind and the import is connected with combustion-supporting fan through the cold blast pipe, the export inserts the gas nozzle through the hot-blast main, the flue gas is led to the second grade heat exchanger shell side, the upper portion of chimney is equipped with the flue baffle that has actuating mechanism, the lower part inserts the gas nozzle through the back flow that has high temperature circulating fan.
2. The energy-saving, low-emission vertical furnace for medium-high pressure air heating according to claim 1, characterized in that: the heating furnace body is in a vertical cylindrical shape, the outer wall of the heating furnace body is a steel structure layer, and the inner wall of the heating furnace body is a refractory ceramic fiber module heat-insulating layer.
3. The energy-saving, low-emission vertical furnace for medium-high pressure air heating according to claim 1, characterized in that: an access door is arranged on the heating furnace body.
4. The energy-saving, low-emission vertical furnace for medium-high pressure air heating according to claim 1, characterized in that: the inner wall of the heating furnace body is hung with the radiation tube bundle through the fixed hook.
5. The energy-saving, low-emission vertical furnace for medium-high pressure air heating according to claim 1, characterized in that: a plurality of radiant tube bundles are distributed along the inner wall of the heating furnace body, a single radiant tube bundle is bent forwards in a shape like a Chinese character 'ji' from a lower port, then is bent backwards in a shape like a Chinese character 'ji' upwards and until the upper port is connected with an upper port, and the upper port and the lower port of the radiant tube bundle are vertically arranged in the same row.
6. The energy-saving, low-emission vertical furnace for medium-high pressure air heating according to claim 1, characterized in that: the primary heat exchanger is of a shell-and-tube structure, and a lower tube plate of a tube pass of the primary heat exchanger is directly connected with the heating furnace body.
7. The energy-saving, low-emission vertical furnace for medium-high pressure air heating according to claim 1, characterized in that: a plurality of baffle plates are arranged in the shell side of the primary heat exchanger.
8. The energy-saving, low-emission vertical furnace for medium-high pressure air heating according to claim 1, characterized in that: an expansion joint is arranged on the shell side of the first-stage heat exchanger.
9. The energy-saving, low-emission vertical furnace for medium-high pressure air heating according to claim 1, characterized in that: the secondary heat exchanger is of a square tube type structure, the top of the secondary heat exchanger is connected with the cylindrical chimney through a pipeline below the upper circle, and the bottom of the secondary heat exchanger is connected with the cylindrical primary heat exchanger through a pipeline above the lower circle.
10. The energy-saving, low-emission vertical furnace for medium-high pressure air heating according to claim 1, characterized in that: the tube pass of the secondary heat exchanger is horizontally arranged, and the inlet and the outlet are on the same side.
CN202120532845.0U 2021-03-15 2021-03-15 Energy-saving low-emission vertical heating furnace for heating medium-high pressure air Active CN214582400U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202120532845.0U CN214582400U (en) 2021-03-15 2021-03-15 Energy-saving low-emission vertical heating furnace for heating medium-high pressure air

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202120532845.0U CN214582400U (en) 2021-03-15 2021-03-15 Energy-saving low-emission vertical heating furnace for heating medium-high pressure air

Publications (1)

Publication Number Publication Date
CN214582400U true CN214582400U (en) 2021-11-02

Family

ID=78319706

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202120532845.0U Active CN214582400U (en) 2021-03-15 2021-03-15 Energy-saving low-emission vertical heating furnace for heating medium-high pressure air

Country Status (1)

Country Link
CN (1) CN214582400U (en)

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