CN214581161U - Purification and waste heat recovery device for combined treatment of flue gas of two heating furnaces - Google Patents

Purification and waste heat recovery device for combined treatment of flue gas of two heating furnaces Download PDF

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CN214581161U
CN214581161U CN202023112023.1U CN202023112023U CN214581161U CN 214581161 U CN214581161 U CN 214581161U CN 202023112023 U CN202023112023 U CN 202023112023U CN 214581161 U CN214581161 U CN 214581161U
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flue gas
smoke
heating furnace
control valve
bypass pipeline
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郭国杰
郭易乔
单春华
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Acre Coking and Refractory Engineering Consulting Corp MCC
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Acre Coking and Refractory Engineering Consulting Corp MCC
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    • 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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Abstract

The utility model relates to a purification and waste heat recovery device of two heating furnace flue gas of combined treatment, including gas cleaning device, flue gas draught fan, ground chimney, combustion air fan, flue gas remote control valve one, flue gas remote control valve two, flue gas governing valve one, flue gas governing valve two, manometer one, manometer two, flue gas by pass pipeline one and flue gas by pass pipeline two. The beneficial effects are as follows: the utility model discloses a device carries out waste heat recovery and purification simultaneously to the flue gas of two heating furnaces, the project investment is economized, take up an area of fewly, the working costs is low, it is very important to energy saving and emission reduction to have, simultaneously, flue gas desulfurization is gathered to this technology, the denitration, remove dust in an organic whole, flue gas aftertreatment purification measure is complete, satisfy the environmental protection emission requirement, and applicable heating furnace fuel gas's kind wide range, strong adaptability, upgrade to newly-built or put into production benzene hydrogenation or other similar chemical plant and reform transform all very easy implementation.

Description

Purification and waste heat recovery device for combined treatment of flue gas of two heating furnaces
Technical Field
The utility model relates to a flue gas treatment technical field especially relates to a purification and waste heat recovery device of two heating furnace flue gases of combined treatment.
Background
The crude benzene refining (benzene hydrogenation) process takes coked crude benzene as a raw material, and produces important chemical products such as pure benzene, toluene, xylene and the like in a hydrogenation and distillation mode, wherein a main reactor heating furnace is required to heat circulating gas in the hydrogenation process, and a heat source is required to be provided for the bottom of a distillation tower in the distillation process. In many benzene hydrogenation production enterprises, because of the limitation of field conditions, no heat source media such as high-pressure steam and medium-pressure steam exist in public and auxiliary conditions, a heat conduction oil heating furnace is required to be arranged besides a main reactor heating furnace, namely, heat conduction oil is adopted as a heat medium to provide heat required by distillation.
The main reactor heating furnace and the heat conducting oil heating furnace play very important roles in the benzene hydrogenation device, and are also used as energy consumption households of production enterprises, the economic benefit of the enterprises is directly influenced by the heat efficiency, and the development and survival of the enterprises are directly influenced by whether the smoke emission meets the environmental protection requirement or not.
Benzene hydrogenation enterprises generally adopt coke oven gas, blast furnace gas or natural gas and the like as fuel gas of a heating furnace, and the flue gas after combustion is discharged to the atmosphere. In comparison, the heat load of the heat conducting oil heating furnace in the benzene hydrogenation device is nearly 10 times that of the heating furnace in the main reactor, so the energy consumption and the smoke discharge amount of the heat conducting oil heating furnace are dominant in the benzene hydrogenation device, and the heat conducting oil heating furnace is used as an organic heat carrier heating furnace, and the national standard has hard regulation and requirements on the heat efficiency.
The benzene hydrogenation process has been developed in China for nearly thirty years, and dozens of benzene hydrogenation devices are built and put into production in China. In the past, the national requirements on environmental protection are loose, energy-saving consciousness of production enterprises is not strong, corresponding measures are not taken for the smoke generated by a heating furnace of a benzene hydrogenation device, the heat of high-temperature smoke is not effectively recycled, energy waste is caused, the heat efficiency of the heating furnace is low, and a large amount of SO in the smoke is generated2、SO3And NOXDirectly discharged to the atmosphere without treatment, causing environmental pollution. In recent years, with increasingly strict requirements of environment protection, energy conservation and emission reduction in countries, places and enterprises, the built benzene hydrogenation device faces the problem of being required to be modified and upgraded, namely, a matched facility for flue gas purification and waste heat recovery is required to be added to the built heating furnace, and complete flue gas treatment measures are required to be considered simultaneously when a newly built benzene hydrogenation device is built.
SUMMERY OF THE UTILITY MODEL
For overcoming the prior art defect, the utility model provides a technical problem provides a purification and waste heat recovery device of two heating furnace flue gases of combined treatment, carry out waste heat recovery and purification simultaneously to the flue gas of two heating furnaces, the project investment is economized, take up an area of less, the working costs is low, it is very important meaning to energy saving and emission reduction, and simultaneously, flue gas desulfurization is gathered to this technology, the denitration, remove dust in an organic whole, flue gas aftertreatment measures are complete, satisfy the environmental protection emission requirement, and applicable heating furnace fuel gas's kind wide range, strong adaptability, it all implements very easily to upgrade to newly-built or put into production benzene hydrogenation or other similar chemical plant.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a purification and waste heat recovery device for jointly processing smoke of two heating furnaces comprises a smoke purification device, a smoke induced draft fan, a ground chimney, a combustion air fan, a smoke remote control valve I, a smoke remote control valve II, a smoke control valve I, a smoke control valve II, a pressure gauge I, a pressure gauge II, a smoke bypass pipeline I and a smoke bypass pipeline II, and is characterized in that the smoke purification device comprises a denitration reactor, an air preheater, a desulfurization absorption tower and a bag-type dust remover, wherein the denitration reactor, the air preheater, the desulfurization absorption tower and the bag-type dust remover are sequentially connected through smoke pipelines;
the inlet of the smoke induced draft fan is connected with the outlet of the smoke purification device, and the outlet of the smoke induced draft fan is connected with a ground chimney;
the inlet of the combustion air fan is communicated with the atmosphere, the outlet of the combustion air fan is connected with the air inlet of the air preheater, and the air outlet of the air preheater is connected with the bottom of the heat-conducting oil heating furnace;
the first flue gas remote control valve is arranged on a chimney at the upper part of the heat conduction oil heating furnace, a first pressure gauge and a first flue gas bypass pipeline are arranged on the chimney of the heat conduction oil heating furnace, which is next to the first flue gas remote control valve, the other end of the first flue gas bypass pipeline is connected with an inlet of a flue gas purification device, a first flue gas regulating valve is arranged on the first flue gas bypass pipeline, and the first flue gas regulating valve and the first pressure gauge are in interlocking control;
the second flue gas remote control valve is arranged on a chimney at the upper part of the main reactor heating furnace, a second pressure gauge and a second flue gas bypass pipeline are arranged on the main reactor heating furnace chimney close to the second flue gas remote control valve, the other end of the second flue gas bypass pipeline is connected to the first flue gas bypass pipeline in front of the flue gas purification device, the second flue gas bypass pipeline is provided with a second flue gas adjusting valve, and the second flue gas adjusting valve and the pressure gauge are controlled in a dual-lock mode.
The motor of the smoke draught fan adopts a variable frequency motor.
Compared with the prior art, the beneficial effects of the utility model are that:
1) the flue gas of the two heating furnaces is simultaneously subjected to waste heat recovery and purification, so that the investment is saved, the occupied area is small, and the operating cost is low;
2) the hot flue gas of the heating furnace of the main reactor and the high-temperature flue gas produced by the heat-conducting oil heating furnace are preheated to the combustion air of the heat-conducting oil heating furnace, so that the process flow is simplified, the temperature of the combustion air of the heat-conducting oil heating furnace is further increased, the fuel gas consumption is saved, the heat efficiency of the heat-conducting oil heating furnace as an organic heat carrier furnace is further increased, and the heat efficiency of the heat-conducting oil heating furnace is far beyond the requirement of the national standard on the heat efficiency of the organic heat carrier furnace;
3) the utility model not only effectively recovers and utilizes the waste heat of the high-temperature flue gas, but also integrates the functions of flue gas desulfurization, denitration and dust removal, thereby meeting the increasingly severe environmental protection emission requirements of the state and the place;
4) before the flue gas of the heating furnace is discharged to the atmosphere, the flue gas is subjected to complete post-treatment and purification measures, so that the range of types of fuel gas adopted by the heating furnace is wide, and the adaptability is stronger;
5) the device has flexible production, simple operation and reasonable configuration, and is easy to implement for new construction or upgrading and reconstruction in the produced benzene hydrogenation or other similar chemical devices.
Drawings
Fig. 1 is a schematic view of the process principle of the present invention.
In the figure: 1-heat-conducting oil heating furnace 2-main reactor heating furnace 3-flue gas induced draft fan 4-ground chimney 5-combustion air fan 6-denitration reactor 7-air preheater 8-desulfurization absorption tower 9-bag dust remover 10-flue gas remote control valve I11-flue gas remote control valve II 12-flue gas regulating valve I13-flue gas regulating valve II 14-pressure gauge I15-pressure gauge II 16-flue gas by-pass pipeline I17-flue gas by-pass pipeline II
Detailed Description
The following description of the embodiments of the present invention will be made with reference to the accompanying drawings:
the utility model relates to a purification and waste heat recovery device for combined treatment of two heating furnace flue gases, which comprises a flue gas purification device, a flue gas draught fan 3, a ground chimney 4, a combustion air fan 5, a flue gas remote control valve 10, a flue gas remote control valve 11, a flue gas regulating valve 12, a flue gas regulating valve 13, a pressure gauge 14, a pressure gauge 15, a flue gas bypass pipeline 16 and a flue gas bypass pipeline 17, wherein the flue gas purification device comprises a denitration reactor 6, an air preheater 7, a desulfurization absorption tower 8 and a bag-type dust remover 9, wherein the denitration reactor 6, the air preheater 7, the desulfurization absorption tower 8 and the bag-type dust remover 9 are connected through the flue gas pipeline in sequence, so as to realize desulfurization, denitration and dust removal purification treatment of the flue gas, and meet increasingly severe environmental protection emission requirements of the country and the place;
the inlet of the flue gas induced draft fan 3 is connected with the outlet of the flue gas purification device, and the outlet is connected with the ground chimney 4;
the inlet of the combustion air fan 5 is communicated with the atmosphere, the outlet of the combustion air fan is connected with the air inlet of the air preheater 7, the air outlet of the air preheater 7 is connected with the bottom of the heat-conducting oil heating furnace 1, and the heated air after heat exchange with the high-temperature flue gas is sent to the heat-conducting oil heating furnace 1;
the first flue gas remote control valve 10 is arranged on a chimney at the upper part of the heat conduction oil heating furnace 1, a first pressure gauge 14 and a first flue gas bypass pipeline 16 are arranged on the chimney of the heat conduction oil heating furnace 1, which is close to the position below the first flue gas remote control valve 10, the other end of the first flue gas bypass pipeline 16 is connected with an inlet of a flue gas purification device, a first flue gas regulating valve 12 is arranged on the first flue gas bypass pipeline 16, and the first flue gas regulating valve 12 and the first pressure gauge 14 are in interlocking control to realize automatic regulation of flue gas pressure;
the second flue gas remote control valve 11 is arranged on a chimney at the upper part of the main reactor heating furnace 2, a second pressure gauge 15 and a second flue gas bypass pipeline 17 are arranged on the chimney of the main reactor heating furnace 2, which is close to the lower part of the second flue gas remote control valve 11, the other end of the second flue gas bypass pipeline 17 is connected to a first flue gas bypass pipeline 16 in front of a flue gas purification device, a second flue gas regulating valve 13 is arranged on the second flue gas bypass pipeline 17, and the second flue gas regulating valve 13 and the second pressure gauge 15 are in interlocking control to realize automatic regulation of flue gas pressure; the flue gas of the main reactor heating furnace 2 and the flue gas of the heat conduction oil heating furnace 1 are gathered and then enter the flue gas purification device at the same time, and the combustion air of the heat conduction oil heating furnace 1 is preheated through the air preheater 7, so that the process flow is simplified, the temperature of the combustion air of the heat conduction oil heating furnace 1 is further improved, the fuel gas consumption is saved, the heat efficiency of the heat conduction oil heating furnace 1 serving as an organic heat carrier furnace is further improved, and the requirement of the heat efficiency of the heat conduction oil heating furnace 1 on the heat efficiency of the organic heat carrier furnace by national standards is further met.
The motor of the smoke draught fan 3 adopts a variable frequency motor, and the size of the smoke volume can be regulated and controlled through variable frequency speed regulation.
A purification and waste heat recovery device for combined treatment of flue gas of two heating furnaces comprises the following process steps and methods:
1) during normal production, the flue gas remote control valve I10 of the chimney on the upper part of the heat conduction oil heating furnace 1 is closed, flue gas generated by the heat conduction oil heating furnace 1 is led out from the flue gas bypass pipeline I16 and enters the denitration reactor 6 in the flue gas purification device, and the flue gas denitration adopts a Selective Catalytic Reduction (SCR) process to remove NH in ammonia water3As a reducing agent, NO in the flue gas is reduced under the action of a catalystXReduction to harmless N2And water; a first flue gas regulating valve 12 is arranged on a first flue gas bypass pipeline 16 of the heat conduction oil heating furnace 1, and automatic regulation is realized by the first flue gas regulating valve and a first chimney pressure gauge 14 on the upper part of the first flue gas bypass pipeline so as to maintain the stable pressure of the chimney of the heat conduction oil heating furnace 1;
2) during normal production, the flue gas remote control valve II 11 of the chimney on the upper part of the main reactor heating furnace 2 is closed, the flue gas generated by the main reactor heating furnace 2 is led out by the flue gas bypass pipeline II 17, and is converged with the flue gas bypass pipeline I16 of the heat conduction oil heating furnace 1 to enter the denitration reactor 6 in the flue gas purification device; a second flue gas regulating valve 13 is arranged on a second flue gas bypass pipeline 17 of the main reactor heating furnace 2, and automatic regulation is realized by the second flue gas bypass pipeline and a second chimney pressure gauge 15 on the upper part of the second flue gas bypass pipeline so as to maintain the stable pressure of the chimney of the main reactor heating furnace 2;
3) the denitrated high-temperature flue gas flows out of the denitration reactor 6, enters the air preheater 7, exchanges heat with air sent by the combustion air fan 5, and the heated air flows out of the air preheater 7 and enters the heat-conducting oil heating furnace 1 from the bottom;
4) the cooled flue gas flows out from an air preheater 7 and enters a desulfurization absorption tower 8, and the flue gas desulfurization adopts a semidry process and adopts hydrated lime Ca (OH)2For absorbing agent, SO in the flue gas2、SO3Removing harmful gases, feeding the desulfurized flue gas into a bag-type dust collector 9, and filtering to remove dust particles in the flue gas;
5) the dedusted flue gas flows out of the bag-type dust collector 9 and enters a flue gas induced draft fan 3, the flue gas induced draft fan 3 pumps the flue gas to a ground chimney 4 to be discharged to the atmosphere at high altitude, and the flue gas induced draft fan 3 adopts a variable frequency motor to carry out variable frequency speed regulation so as to adapt to the change of the flue gas amount of the heat-conducting oil heating furnace 1 and the main reactor heating furnace 2 caused by the change of production load;
6) during start-up debugging, when a flue gas purification device or a flue gas induced draft fan 3 is in an accident state, opening a first flue gas remote control valve 10 or a second flue gas remote control valve 11 of a chimney on the upper portion of a heat conduction oil heating furnace 1 or a main reactor heating furnace 2, closing a first flue gas regulating valve 12 or a second flue gas regulating valve 13 on a first flue gas bypass pipe 16 or a second flue gas bypass pipe 17, discharging flue gas to the atmosphere from a chimney at the top of the heat conduction oil heating furnace 1 or the main reactor heating furnace 2 in a short period, and introducing combustion-supporting air into the bottom of the heat conduction oil heating furnace 1 through natural air suction at the moment.
The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.

Claims (2)

1. A purification and waste heat recovery device for jointly processing smoke of two heating furnaces comprises a smoke purification device, a smoke induced draft fan, a ground chimney, a combustion air fan, a smoke remote control valve I, a smoke remote control valve II, a smoke control valve I, a smoke control valve II, a pressure gauge I, a pressure gauge II, a smoke bypass pipeline I and a smoke bypass pipeline II, and is characterized in that the smoke purification device comprises a denitration reactor, an air preheater, a desulfurization absorption tower and a bag-type dust remover, wherein the denitration reactor, the air preheater, the desulfurization absorption tower and the bag-type dust remover are sequentially connected through smoke pipelines;
the inlet of the smoke induced draft fan is connected with the outlet of the smoke purification device, and the outlet of the smoke induced draft fan is connected with a ground chimney;
the inlet of the combustion air fan is communicated with the atmosphere, the outlet of the combustion air fan is connected with the air inlet of the air preheater, and the air outlet of the air preheater is connected with the bottom of the heat-conducting oil heating furnace;
the first flue gas remote control valve is arranged on a chimney at the upper part of the heat conduction oil heating furnace, a first pressure gauge and a first flue gas bypass pipeline are arranged on the chimney of the heat conduction oil heating furnace, which is next to the first flue gas remote control valve, the other end of the first flue gas bypass pipeline is connected with an inlet of a flue gas purification device, a first flue gas regulating valve is arranged on the first flue gas bypass pipeline, and the first flue gas regulating valve and the first pressure gauge are in interlocking control;
the second flue gas remote control valve is arranged on a chimney at the upper part of the main reactor heating furnace, a second pressure gauge and a second flue gas bypass pipeline are arranged on the main reactor heating furnace chimney close to the second flue gas remote control valve, the other end of the second flue gas bypass pipeline is connected to the first flue gas bypass pipeline in front of the flue gas purification device, the second flue gas bypass pipeline is provided with a second flue gas adjusting valve, and the second flue gas adjusting valve and the pressure gauge are controlled in a dual-lock mode.
2. The device for purifying and recovering the waste heat of the flue gas of the two heating furnaces in the combined treatment manner according to claim 1, wherein a motor of the flue gas induced draft fan is a variable frequency motor.
CN202023112023.1U 2020-12-22 2020-12-22 Purification and waste heat recovery device for combined treatment of flue gas of two heating furnaces Active CN214581161U (en)

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CN202023112023.1U CN214581161U (en) 2020-12-22 2020-12-22 Purification and waste heat recovery device for combined treatment of flue gas of two heating furnaces

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