CN113776055B - Radiant tube low-nitrogen combustion and flue gas waste heat recovery system - Google Patents

Radiant tube low-nitrogen combustion and flue gas waste heat recovery system Download PDF

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Publication number
CN113776055B
CN113776055B CN202110965447.2A CN202110965447A CN113776055B CN 113776055 B CN113776055 B CN 113776055B CN 202110965447 A CN202110965447 A CN 202110965447A CN 113776055 B CN113776055 B CN 113776055B
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pipeline
radiant tube
air
steam
coil pipe
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CN202110965447.2A
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CN113776055A (en
Inventor
宋中华
李�浩
王昌亮
丁翠娇
闫乃忠
杨超
胡金伟
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Wuhan Iron and Steel Co Ltd
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Wuhan Iron and Steel Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/12—Radiant burners
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B1/00—Methods of steam generation characterised by form of heating method
    • F22B1/02—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers
    • F22B1/18—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being a hot gas, e.g. waste gas such as exhaust gas of internal-combustion engines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/46—Details, e.g. noise reduction means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/46—Details, e.g. noise reduction means
    • F23D14/66—Preheating the combustion air or gas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
    • F23L7/00—Supplying non-combustible liquids or gases, other than air, to the fire, e.g. oxygen, steam
    • F23L7/002—Supplying water
    • F23L7/005—Evaporated water; Steam
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00—Combustion technologies with mitigation potential
    • Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Air Supply (AREA)

Abstract

The invention discloses a radiant tube low-nitrogen combustion and flue gas waste heat recovery system, which comprises a radiant tube, a burner, a gas pipeline, a normal-temperature air pipeline, a coil pipe, a water inlet pipeline, a water vapor pipeline and a drainage pipeline, wherein the burner is arranged on the radiant tube; a burner is arranged at one end of the radiant tube, and the gas pipeline, the normal-temperature air pipeline and the water vapor pipeline are respectively communicated with the inside of the burner; the other end of the radiant tube is a smoke outlet end, the smoke outlet end is communicated with a smoke exhaust pipeline, and a coil pipe is arranged in the smoke exhaust pipeline; the water inlet pipeline is communicated with the water inlet of the coil pipe, and the steam outlet of the coil pipe is communicated with the steam pipeline. The beneficial effects of the invention are as follows: the invention designs the coil pipe in the smoke exhaust pipeline, heats the water into steam by the high-temperature waste heat of the smoke exhausted by the radiant tube, then mixes the steam with the combustion air, and then enters the radiant tube to be mixed with fuel gas for combustion, thereby reducing the oxygen concentration and the high-temperature peak value of a combustion area, eliminating the need of installing and arranging a special complex smoke entrainment reflux device on the burner of the radiant tube, and having small required space.

Description

Radiant tube low-nitrogen combustion and flue gas waste heat recovery system
Technical Field
The invention relates to the field of metallurgical energy, in particular to a radiant tube low-nitrogen combustion and flue gas waste heat recovery system.
Background
Currently, the traditional low-nitrogen oxide combustion technology widely used in the steel industry mainly comprises a staged combustion process and a flue gas circulation process. The flue gas circulation process is to mix the flue gas containing nitrogen, water vapor and carbon dioxide generated by combustion into combustion air through a device, and reduce the oxygen concentration and local high temperature of a combustion area by utilizing the flue gas, thereby reducing the generation amount of nitrogen oxides. In this process, it is very important how effectively the flue gas is introduced into the combustion air to dilute the oxygen content of the air. However, the radiant tube diameter for the cold-rolled annealing furnace is small, and there are the following problems:
(1) Because the radiant tube has smaller structure size, the combustion device has complex structure, and when adopting the flue gas backflow low nitrogen oxide combustion technology, a special flue gas entrainment device is required; however, the space of the head of the radiation tube is small, particularly the U-shaped radiation tube has short stroke, and the space of the heat exchanger and the burner is small, so that the smoke reflux device is complex and difficult to arrange, the smoke circulation quantity can not be ensured, and the effect of reducing NOx is poor.
(2) The high-concentration nitrogen contained in the flue gas increases the N concentration of the combustion reaction zone, inhibits the effect of reducing nitrogen oxides, increases the volume of the gas in the radiant tube, accelerates the flow speed, and causes incomplete combustion outside the discharge tube when the fuel gas does not react.
(3) The radiation tube has small combustion space, high combustion strength and high exhaust gas temperature, but the currently used air-flue gas heat exchanger has limited waste heat recovery capability in a limited space, so that the temperature of finally discharged flue gas is over high, usually 500-600 ℃, and the finally discharged flue gas is cooled by cooling air and then discharged into the atmosphere through a flue gas fan, so that the heat loss of the exhausted flue gas is large and the heat efficiency is low.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides a low-nitrogen combustion and flue gas waste heat recovery system for a radiant tube, solves the problems of local high temperature and high emission concentration of nitrogen oxides in the existing radiant tube, and can also recover the heat of high-temperature flue gas discharged by the radiant tube.
The invention adopts the technical scheme that: a radiant tube low-nitrogen combustion and flue gas waste heat recovery system comprises a radiant tube, a burner, a gas pipeline, a normal-temperature air pipeline, a coil pipe, a water inlet pipeline, a water vapor pipeline and a drainage pipeline; a burner is arranged at one end of the radiant tube, and the gas pipeline, the normal-temperature air pipeline and the water vapor pipeline are respectively communicated with the inside of the burner; the other end of the radiant tube is a smoke outlet end, the smoke outlet end is communicated with a smoke exhaust pipeline, and a coil pipe is arranged in the smoke exhaust pipeline; the water inlet pipeline is communicated with the water inlet of the coil pipe, and the steam outlet of the coil pipe is communicated with the steam pipeline; the steam in the steam pipeline and the combustion air in the normal temperature air pipeline enter the burner and are mixed with fuel gas for combustion, high-temperature flue gas generated by combustion exchanges heat with water in the water inlet pipeline through the coil pipe, and the water is heated to generate steam and then enters the nozzle.
According to the scheme, the coil pipe is of a spiral structure and is vertically arranged in the smoke exhaust pipeline; the water inlet of the coil pipe is positioned at the lower end and is communicated with the water inlet pipeline; the steam outlet of the coil pipe is positioned at the upper end and is communicated with the steam pipeline; water enters from the lower end of the coil pipe, steam is generated above the coil pipe and flows out, the water flow direction is from bottom to top, water enters from the lower part, and steam is discharged from the upper part.
According to the scheme, the outer wall of the coil pipe is provided with the fins.
According to the scheme, the coil pipe is a hollow steel pipe or a hollow copper pipe.
According to the scheme, the air-smoke heat exchanger is arranged at the outlet end of the radiant tube, an air channel is arranged in the air-smoke heat exchanger, the inlet of the air channel is communicated with the normal-temperature air pipeline, and the outlet of the air channel is communicated with the heating air pipeline; the gap between the outer wall of the air-smoke heat exchanger and the inner wall of the radiant tube is a smoke flow passage; the water vapor pipeline is communicated with the heating air pipeline; air in the air flow passage exchanges heat with the flue gas and then enters the heating air pipeline, and the air is mixed with steam in the steam pipeline and then enters the nozzle to be mixed with fuel gas for combustion.
According to the scheme, the air-smoke heat exchanger is arranged at the joint of the smoke exhaust pipeline and the radiant tube.
According to the scheme, the radiation tube is a U-shaped tube.
The beneficial effects of the invention are as follows:
(1) The invention designs the coil pipe in the smoke exhaust pipeline, heats the water into steam by the high-temperature waste heat of the smoke exhausted by the radiant tube, then mixes the steam with the combustion air, and then enters the radiant tube to be mixed with fuel gas for combustion, thereby reducing the oxygen concentration and the high-temperature peak value of a combustion area, eliminating the need of installing and arranging a special complex smoke entrainment reflux device on the burner of the radiant tube, and having small required space.
(2) The water entering the coil pipe exchanges heat with the high-temperature flue gas exhausted by the radiant tube, the temperature of the high-temperature flue gas exhausted by the radiant tube can be reduced to below 300 ℃ (the temperature is measured in actual production), a cold air suction cooling device is not required to be arranged, the heat carried by water vapor and combustion air are mixed and then enter the radiant tube again, and the flue gas waste heat recovery rate and the heat efficiency are high.
(3) In the invention, the flue gas-water heat exchanger occupies smaller space than the traditional gas-gas heat exchanger due to larger water evaporation and phase change heat.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Fig. 2 is a flow chart of the gas in the present embodiment.
Fig. 3 is a schematic structural diagram of a coil in this embodiment.
Wherein: 1-a normal temperature air pipeline; 2-air pipeline valve; 3-a water inlet pipeline; 4-a water inlet pipeline valve; 5-a smoke exhaust pipeline; 6-coil pipe; 7-a water vapor pipeline; 8-a water vapor pipeline valve; 9-heating air duct; 10-burner; 11-a gas pipeline; 12-a gas pipeline valve; 13-a radiant tube; 14-an air-to-smoke heat exchanger; 15-pipe network valve.
Detailed Description
For a better understanding of the present invention, the present invention is further described below with reference to the drawings and specific examples.
The low-nitrogen combustion and flue gas waste heat recovery system of the radiant tube shown in fig. 1 comprises a radiant tube 13, a burner 10, a gas pipeline 11, a normal-temperature air pipeline 1, a coil 6, a water inlet pipeline 3 and a water vapor pipeline 7; a burner 10 is arranged at one end of the radiant tube 13, and the gas pipeline 11, the normal-temperature air pipeline 1 and the water vapor pipeline 7 are respectively communicated with the inside of the burner 10; the other end of the radiant tube 13 is a smoke outlet end, the smoke outlet end is communicated with a smoke exhaust pipeline 5, and a coil pipe 6 is arranged in the smoke exhaust pipeline 5; the water inlet pipeline 3 is communicated with a water inlet of the coil pipe 6, and a steam outlet of the coil pipe 6 is communicated with a steam pipeline 7. In the invention, steam in the steam pipeline 7 and combustion air in the normal temperature air pipeline 1 enter the burner 10 to be mixed with fuel gas for combustion, high temperature flue gas generated by combustion exchanges heat with water in the water inlet pipeline 3 through the coil pipe 6, and the water is heated to generate steam and then enters the nozzle.
Preferably, as shown in fig. 3, the coil pipe 6 has a spiral structure and is vertically arranged in the smoke exhaust pipe 5; the water inlet of the coil pipe 6 is positioned at the lower end and is communicated with the water inlet pipeline 3; the steam outlet of the coil pipe 6 is positioned at the upper end and is communicated with the steam pipeline 7; water enters from the lower end of the coil pipe 6, steam is generated above the coil pipe and flows out, the water flow direction is from bottom to top, water enters from the lower part, and steam is discharged from the upper part.
Preferably, the coil pipe 6 is a hollow steel pipe or copper pipe; the outer wall of the coil pipe 6 is provided with fins, so that the turbulent flow of the flue gas is enhanced, and the heat exchange efficiency is improved.
Preferably, an air-smoke heat exchanger 14 is arranged at the outlet end of the radiant tube 13, an air flow channel is arranged inside the air-smoke heat exchanger 14, the inlet of the air flow channel is communicated with the normal-temperature air pipeline 1, and the outlet of the air flow channel is communicated with the heating air pipeline 9; the gap between the outer wall of the air-smoke heat exchanger 14 and the inner wall of the radiant tube 13 is a smoke flow passage; the water vapor pipeline 7 is communicated with a heating air pipeline 9; air in the air flow passage exchanges heat with flue gas and then enters the heating air pipeline 9, and the air is mixed with steam in the steam pipeline 7 and then enters the nozzle to be mixed with fuel gas for combustion.
In the invention, the water vapor is converged into the heating air pipeline 9 through the water vapor pipeline 7, and the normal-temperature air enters the air-smoke heat exchanger 14 through the normal-temperature air pipeline 1 to exchange heat with the high-temperature smoke, so that the implementation can maximize the air preheating and can recycle more smoke waste heat.
Preferably, the air-to-smoke heat exchanger 14 is mounted at the junction of the smoke exhaust duct 5 and the radiant tube 13.
Preferably, the radiant tube 13 is a U-shaped tube.
In the present invention, the steam pipe 7 is further provided with waterThe steam pipeline valve 8 controls the pressure and flow of the steam entering the heating air pipeline 9 by the steam pipeline valve, the steam pressure is controlled to be 10-15 kPa, the steam flow is determined according to the burning requirement of the burner 10, the steam flow accounts for 0-50% of the combustion air flow, and O in the air after being mixed with the steam 2 The content is 14-21%.
In this embodiment, an air pipeline valve 2 is configured on the normal temperature air pipeline 1 to control on-off of air; the gas pipeline 11 is provided with a gas pipeline valve 12 for controlling the on-off of gas; a water inlet valve is arranged on the water inlet pipeline 3 to control the on-off of water inlet; the steam channel is communicated with a steam pipe network, and a functional network valve is arranged on a communication pipeline of the steam channel and the steam pipe network.
When the system of the invention is in operation, the flow directions of the fluids are shown in figure 2; the whole system is operated by the following three processes:
1. the ambient air with the oxygen content of 21% enters an air-smoke heat exchanger 14 arranged at the tail part of a radiation pipe 13 through an air pipeline valve 2, and enters a heating air pipeline 9 after the smoke in a smoke flow passage exchanges heat;
2. water enters a coil pipe 6 arranged in a smoke exhaust pipeline 5 through a water inlet pipeline 3 and a water inlet pipeline valve 4, exchanges heat with high-temperature smoke outside the coil pipe 6, is heated in the coil pipe 6 to generate water vapor, the water vapor with smaller density rises through a water vapor pipeline 7, part of the water vapor enters a heating air pipeline 9 through a water vapor pipeline valve 8, is mixed with preheated air in the heating air pipeline 9, enters a burner 10 arranged in a radiant tube 13, and is mixed with fuel gas for combustion; the other part of water vapor enters a steam pipe network for other working procedures through a pipe network valve 15;
3. the high-temperature flue gas generated by combustion heats the radiant tube 13, enters the flue gas flow channel, exchanges heat with air, exchanges heat with water in the coil pipe 6, and is discharged.
Finally, it should be noted that the foregoing is merely a preferred embodiment of the present invention, and the present invention is not limited thereto, and although the present invention has been described in detail with reference to the embodiment, it will be apparent to those skilled in the art that modifications may be made to the technical solutions described in the foregoing embodiments, or equivalents may be substituted for some of the technical features thereof, but any modifications, equivalents, improvements or changes thereof may be made without departing from the spirit and principle of the present invention.

Claims (7)

1. The low-nitrogen combustion and flue gas waste heat recovery system for the radiant tube is characterized by comprising the radiant tube, a burner, a gas pipeline, a normal-temperature air pipeline, a coil pipe, a water inlet pipeline, a water vapor pipeline and a drainage pipeline; a burner is arranged at one end of the radiant tube, and the gas pipeline, the normal-temperature air pipeline and the water vapor pipeline are respectively communicated with the inside of the burner; the other end of the radiant tube is a smoke outlet end, the smoke outlet end is communicated with a smoke exhaust pipeline, and a coil pipe is arranged in the smoke exhaust pipeline; the water inlet pipeline is communicated with the water inlet of the coil pipe, and the steam outlet of the coil pipe is communicated with the steam pipeline; the steam in the steam pipeline and the combustion air in the normal temperature air pipeline enter the burner and are mixed with fuel gas for combustion, high-temperature flue gas generated by combustion exchanges heat with water in the water inlet pipeline through the coil pipe, and the water is heated to generate steam and then enters the nozzle.
2. The radiant tube low nitrogen combustion and flue gas waste heat recovery system as recited in claim 1, wherein the coil is of a spiral structure and vertically arranged in the flue gas duct; the water inlet of the coil pipe is positioned at the lower end and is communicated with the water inlet pipeline; the steam outlet of the coil pipe is positioned at the upper end and is communicated with the steam pipeline; water enters from the lower end of the coil pipe, steam is generated above the coil pipe and flows out, the water flow direction is from bottom to top, water enters from the lower part, and steam is discharged from the upper part.
3. The radiant tube low nitrogen combustion and flue gas waste heat recovery system of claim 2, wherein the outer wall of the coil is provided with fins.
4. The radiant tube low nitrogen combustion and flue gas waste heat recovery system of claim 2, wherein the coil is a hollow steel tube or copper tube.
5. The radiant tube low-nitrogen combustion and flue gas waste heat recovery system as recited in claim 1, wherein an air-flue heat exchanger is arranged at the outlet end of the radiant tube, an air flow passage is arranged in the air-flue heat exchanger, the inlet of the air flow passage is communicated with a normal-temperature air pipeline, and the outlet of the air flow passage is communicated with a heating air pipeline; the gap between the outer wall of the air-smoke heat exchanger and the inner wall of the radiant tube is a smoke flow passage; the water vapor pipeline is communicated with the heating air pipeline; air in the air flow passage exchanges heat with the flue gas and then enters the heating air pipeline, and the air is mixed with steam in the steam pipeline and then enters the nozzle to be mixed with fuel gas for combustion.
6. The radiant tube low nitrogen combustion and flue gas waste heat recovery system of claim 5, wherein the air-to-flue heat exchanger is mounted at the junction of the flue gas duct and the radiant tube.
7. The radiant tube low nitrogen combustion and flue gas waste heat recovery system of claim 1, wherein the radiant tube is a U-shaped tube.
CN202110965447.2A 2021-08-23 2021-08-23 Radiant tube low-nitrogen combustion and flue gas waste heat recovery system Active CN113776055B (en)

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CN113776055B true CN113776055B (en) 2023-06-30

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0828821A (en) * 1994-07-12 1996-02-02 Tokyo Gas Co Ltd Radiant tube burner equipment producing little nitrogen oxide, and burning method thereof
CN2506879Y (en) * 2001-10-23 2002-08-21 陕西杨凌航天节水科技股份有限公司 natural gas gasification burner
CN102607030A (en) * 2012-04-09 2012-07-25 武汉钢铁(集团)公司 Double-regenerative combustor

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6806444B2 (en) * 2001-02-21 2004-10-19 William S. Lerner Heat warning safety device using fiber optic cables
US6869277B2 (en) * 2002-03-16 2005-03-22 Exxonmobil Chemical Patents Inc. Burner employing cooled flue gas recirculation
US20070221142A1 (en) * 2006-03-20 2007-09-27 American Water Heater Company, A Corporation Of The State Of Nevada Ultra low NOx water heater

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0828821A (en) * 1994-07-12 1996-02-02 Tokyo Gas Co Ltd Radiant tube burner equipment producing little nitrogen oxide, and burning method thereof
CN2506879Y (en) * 2001-10-23 2002-08-21 陕西杨凌航天节水科技股份有限公司 natural gas gasification burner
CN102607030A (en) * 2012-04-09 2012-07-25 武汉钢铁(集团)公司 Double-regenerative combustor

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