CN111174189A - Process for efficient waste heat recovery and denitration combination of gas turbine tail gas - Google Patents

Process for efficient waste heat recovery and denitration combination of gas turbine tail gas Download PDF

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Publication number
CN111174189A
CN111174189A CN201910793178.9A CN201910793178A CN111174189A CN 111174189 A CN111174189 A CN 111174189A CN 201910793178 A CN201910793178 A CN 201910793178A CN 111174189 A CN111174189 A CN 111174189A
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CN
China
Prior art keywords
pressure
denitration
low
flue gas
pressure boiler
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Pending
Application number
CN201910793178.9A
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Chinese (zh)
Inventor
杨卫东
高军
田俊凯
汪红亮
陆朝阳
范昌海
寇亮
周轶
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Zhejiang Satellite Energy Co ltd
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Zhejiang Satellite Energy Co ltd
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Priority to CN201910793178.9A priority Critical patent/CN111174189A/en
Publication of CN111174189A publication Critical patent/CN111174189A/en
Pending legal-status Critical Current

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22STEAM GENERATION
    • F22BMETHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B1/00Methods of steam generation characterised by form of heating method
    • F22B1/02Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers
    • F22B1/18Methods 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
    • F22B1/1807Methods 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 using the exhaust gases of combustion engines
    • F22B1/1815Methods 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 using the exhaust gases of combustion engines using the exhaust gases of gas-turbines
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/46Removing components of defined structure
    • B01D53/54Nitrogen compounds
    • B01D53/56Nitrogen oxides
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/92Chemical or biological purification of waste gases of engine exhaust gases
    • B01D53/94Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
    • B01D53/9404Removing only nitrogen compounds
    • B01D53/9409Nitrogen oxides

Abstract

The utility model provides a process for high-efficient waste heat recovery of gas turbine tail gas and denitration allies oneself with uses, flue gas from gas turbine emission gets into flue gas denitration system, through high-pressure boiler superheat section and the saturated steam that comes from the high-pressure steam pocket carry out the heat transfer, then through high-pressure boiler evaporation zone and the high-pressure boiler water heat transfer that comes from the high-pressure steam pocket, later get into denitration reaction bed and catalyst contact through the fan and carry out the denitration reaction, later through low-pressure boiler evaporation zone and the low-pressure boiler water heat transfer that comes from the low-pressure steam pocket, discharge through the chimney after high-pressure boiler economize coal section and high-pressure boiler water heat. The high-pressure steam drum and the low-pressure steam drum exchange heat with the flue gas to generate high-pressure steam and low-pressure steam, and waste heat in the flue gas is recovered to the maximum extent, so that the comprehensive utilization rate of the gas turbine is improved to more than 95%, the operation and investment cost is reduced, and the requirements of energy conservation and environmental protection are met.

Description

Process for efficient waste heat recovery and denitration combination of gas turbine tail gas
Technical Field
The invention belongs to the technical field of flue gas denitration and waste heat recovery, and particularly relates to a process for efficient waste heat recovery and denitration combination of a gas turbine.
Background
Along with the national higher and higher requirements on environmental protection and chemical energy consumption, the gas turbine is more and more widely applied to chemical automation, and has obvious energy-saving effect compared with the traditional steam turbine and the energy-saving effect of taking a motor as a driving force. With the increasingly strict national requirements on air pollution control, the types of pollutants for limiting emission are gradually increased, the emission control requirements of nitrogen oxides and dust are clearly and forcibly implemented for many times, and the emission of nitrogen oxides in many regions in China is forced to be 50mg/Nm3The following. Therefore, in order to meet the requirement of environmental protection, the flue gas is usually required to be subjected to dust removal and denitration treatment.
On the other hand, the energy utilization in China still has the problems of low utilization efficiency, poor economic benefit, high energy consumption and the like, wherein the low utilization rate of industrial waste heat and the insufficient comprehensive utilization of energy are important reasons for energy consumption, the industrial waste heat resources in China are rich and widely exist in the production process of various industries in industry, the waste heat resources account for 17% -67% of the total fuel consumption, the recovery rate can reach 60%, the waste heat utilization rate is large in promotion space, the energy-saving potential is huge, the industrial waste heat recovery and utilization is considered as a new energy source, and the new energy source becomes an important content for promoting the energy-saving and emission-reducing work in China in recent years. The industrial waste heat mainly takes the flue gas waste heat, and accounts for more than 50% of the total amount of industrial waste heat resources.
At present, most of the traditional power plants adopt a high-temperature denitration mode to treat flue gas, and the application of a gas turbine in chemical automatic continuous production is severely limited.
Traditional gas turbine adopts solitary waste heat recovery device and independent denitration to ally oneself with usefulness, and it is not enough to have waste heat recovery, and the energy consumption is extravagant, does not accord with the requirement to energy-concerving and environment-protective under the new trend. Solitary denitrification facility leads to the denitration cost to increase, no matter low temperature or high temperature denitration, and the maintenance cost is high, and the waste heat after the denitration can not be retrieved moreover, causes the secondary waste of energy consumption.
Chinese patent application No. 201210156824.9 discloses a flue gas waste heat recovery device of a gas boiler (direct combustion engine) with denitration and water collection functions, which is used for removing nitrogen oxides in flue gas by ozone oxidation and alkali liquor absorption while recovering flue gas waste heat and water collection functions. However, the device has the defects of high energy consumption, high investment cost, large maintenance pressure, high operation cost, low stability and the like, and is not suitable for being applied to the chemical continuous production mainly based on stability.
Chinese patent application No. 201620886151.6 discloses a bypass flue gas denitration system of combustion engine tail gas, and this patent technique utilizes flue gas denitration system to carry out denitration treatment to the flue gas, utilizes exhaust-heat boiler to carry out waste heat recovery, realizes the technical transformation of power plant basically, thereby this technique is used and is had the fault rate height to make the shut down risk increase in the automatic continuous application of chemical industry, and the waste heat shortcoming such as not fully recovered.
Disclosure of Invention
The invention aims to provide a process for efficient waste heat recovery and denitration combined use of tail gas of a gas turbine, which realizes denitration and waste heat efficient recovery of flue gas while chemical automation continuous application of a gas turbine is realized, so that the comprehensive utilization rate of the gas turbine is improved and reaches over 95 percent, the operation and investment cost is reduced, and the requirements of energy conservation and environmental protection are met.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the utility model provides a process for high-efficient waste heat recovery of gas turbine tail gas and denitration allies oneself with uses, flue gas from gas turbine emission gets into flue gas denitration system, through high-pressure boiler superheat section and the saturated steam that comes from the high-pressure steam pocket carry out the heat transfer, then through high-pressure boiler evaporation zone and the high-pressure boiler water heat transfer that comes from the high-pressure steam pocket, later get into denitration reaction bed and catalyst contact through the fan and carry out the denitration reaction, later through low-pressure boiler evaporation zone and the low-pressure boiler water heat transfer that comes from the low-pressure steam pocket, discharge through the chimney after high-pressure boiler economize coal section and high-pressure boiler water heat.
Preferably, the flue gas denitration system further comprises an emergency discharge chimney and an emergency discharge valve for controlling the emergency discharge chimney.
Preferably, two fans are arranged, and one fan is used for standby; the fan has the advantages that the pressure P in front of the fan is less than 5kPa, the smaller the pressure in front of the fan is, the higher the efficiency of the combustion engine is relative to the pressure P in front of the fan, the pressure in front of the fan is controlled to be 0.5-5 kPa, preferably 1-2 kPa, and along with the extension of the working time of the fan, a motor or a rotor in the fan can be out of order to cause the fan to stop running, and once the running fan stops running, the other fan is automatically started, the pressure of smoke discharged by the combustion engine is not influenced, and the efficiency of the combustion. This operation is stable, and degree of automation is high, can avoid leading to the combustion engine to shut down because of fan shutdown, makes the even running of system, is fit for the automatic continuous requirement of chemical industry.
Preferably, the low-pressure boiler water from the low-pressure steam drum exchanges heat with the flue gas and then returns to the low-pressure steam drum, and the generated low-pressure steam enters a low-pressure steam pipe network.
Preferably, the high-pressure boiler water after heat exchange with the flue gas in the coal-saving section of the high-pressure boiler enters the high-pressure boiler evaporation section through the high-pressure steam drum, returns to the high-pressure steam drum after heat exchange with the flue gas, then forms saturated steam, enters the high-pressure boiler evaporation section to exchange heat with the flue gas to generate superheated steam, and the superheated steam enters the temperature and pressure reducing device to generate saturated steam and enters the high-pressure steam pipe network.
Preferably, the denitration reaction bed layer is used for denitration reaction by adopting an SCR denitration catalyst.
In the process for the efficient waste heat recovery and denitration combined use of the tail gas of the gas turbine, the invention comprises the following steps: the low-pressure steam pocket and the high-pressure steam pocket exchange heat with the flue gas for multiple times, so that the waste heat in the flue gas is recovered to the maximum extent, and the utilization efficiency of the flue gas is improved. And adopt the double fan design in flue gas denitration process, can effectively avoid because the combustion engine that the fan trouble arouses shuts down the risk to can make the combustion engine even running satisfy the continuous automatic requirement of chemical industry.
A low-pressure steam drum: the low-pressure boiler feed water enters a low-pressure steam drum, the low-pressure boiler water enters the low-pressure boiler evaporation section from the low-pressure steam drum, exchanges heat with flue gas to recover heat, returns to the low-pressure steam drum, generates low-pressure steam, and enters a low-pressure steam pipe network.
A high-pressure steam drum: the high-pressure boiler supplies water, enters the coal-saving section of the high-pressure boiler to exchange heat with the flue gas and then enters the high-pressure steam drum, the high-pressure boiler water enters the evaporation section of the high-pressure boiler from the high-pressure steam drum to exchange heat with the flue gas again and then returns to the high-pressure steam drum, saturated steam enters the superheating section of the high-pressure boiler from the high-pressure steam drum to exchange heat with the flue gas to generate superheated steam, and the superheated steam enters the temperature and pressure reducing device to generate.
Compared with the prior art, the invention has the advantages that:
the invention fully considers the space, the direct waste heat recovery benefit, the system resistance and the like, does not influence the efficiency of the direct waste heat recovery gas turbine, can realize the high-efficiency waste heat recovery of the gas turbine, and simultaneously meets the environmental protection requirement of denitration.
The invention can realize space saving, small investment and low operation cost, does not need additional afterburning consumption and meets the operation requirement of chemical automation on the combustion engine continuously.
Under the background of environmental protection continuous upgrading, more environmental protection than traditional solitary waste heat recovery device can be transferred NO under different operating modesxThe compound is controlled to 30mg/m3The following.
The high-pressure steam drum and the low-pressure steam drum exchange heat with the flue gas to generate high-pressure steam and low-pressure steam, and waste heat is recovered to the maximum extent, so that the comprehensive utilization rate of the gas turbine is improved to more than 95%, the operation and investment cost is reduced, and the requirements of energy conservation and environmental protection are met.
The flue gas denitration system provided by the invention adopts the double fans, so that the shutdown risk of the gas turbine is reduced, the automation degree is high, and the flue gas denitration system is suitable for the continuous requirement of chemical automation.
Drawings
FIG. 1 is a schematic diagram of an embodiment of the present invention;
in the figure: t1 emergency discharge chimney, T2 normal discharge chimney, V1 high-pressure boiler steam pocket, V2 low-pressure boiler steam pocket, MX1 high-pressure boiler economize coal section, MX2 low-pressure boiler evaporation section, MX3 high-pressure boiler evaporation section, MX4 high-pressure boiler superheat section, MX5 temperature and pressure reduction ware, C1 fan 1, C2 fan 2, HV1 emergency discharge valve, HV2 control valve, R1 denitration reaction bed.
Detailed Description
Referring to fig. 1, the process for the efficient waste heat recovery and denitration of the tail gas of the gas turbine is combined,
520 ℃ flue gas discharged from a gas turbine enters a flue gas denitration system through an HV2 control valve, exchanges heat with saturated steam from a high-pressure steam drum V1 through a high-pressure boiler overheating section MX4, is cooled to 420 ℃, exchanges heat with high-pressure boiler water from the high-pressure steam drum V1 through a high-pressure boiler evaporation section MX3, is cooled to 220 ℃, enters a denitration reaction bed layer R1 through a fan C1 (a fan C2 for standby) to contact with an SCR denitration catalyst for denitration reaction, and the content of nitrogen oxides in the flue gas is reduced to 30mg/Nm3Then the flue gas passes through the low-pressure boiler evaporation section MX2 to exchange heat with low-pressure boiler water from a low-pressure steam pocket V2, is cooled to 165 ℃, and finally is cooled to 120 ℃ in the high-pressure boiler coal-saving section MX1 to exchange heat with high-pressure boiler water, and then is discharged to the atmosphere through a normal discharge chimney T2.
The flue gas denitration system also comprises an emergency discharge chimney T1 and an emergency discharge valve HV1 for controlling the emergency discharge chimney, when the fans are in failure and can not normally operate, the emergency discharge valve HV1 is opened to discharge the flue gas entering the flue gas denitration system through the economic discharge chimney T1, and the pressure in the system is ensured to be within a safe range.
Low-pressure drum V2: the low-pressure boiler feed water P3 enters a low-pressure steam pocket V2, then enters a low-pressure boiler evaporation section MX2, exchanges waste heat with denitrated flue gas, and then returns to V2 to generate low-pressure steam P4, and enters a low-pressure steam pipe network. Wherein the pressure of the low-pressure steam recovered by the low-pressure steam drum V2 is 0.4MPa, and the recovery rate is 6 t/h.
High-pressure drum V1: high-pressure boiler feed water P1 enters a high-pressure boiler coal-saving section MX1 to exchange heat with gas turbine flue gas to generate high-pressure boiler water P2 and enters a high-pressure steam drum V1, the high-pressure boiler water P2 enters a high-pressure boiler evaporation section MX3 from the high-pressure steam drum V1 to exchange heat with the flue gas again and then returns to V1, saturated steam enters a high-pressure boiler superheating section MX4 from the high-pressure steam drum V1 to exchange heat with the flue gas, and the generated superheated steam enters MX5 to generate saturated steam P5 and enters a high-pressure steam pipe network. Wherein the pressure of the high-pressure steam recovered by the high-pressure steam drum V1 is 4.0MPa, and the recovery rate is 336 t/h.
The pressure P before the fan is controlled to be 1.2kPa by the fan, and the comprehensive utilization rate of the gas turbine can reach more than 95% by recycling waste heat through the high-pressure steam drum and the low-pressure steam drum, so that the energy-saving effect is obvious.

Claims (6)

1. A process for efficient waste heat recovery and denitration of tail gas of a gas turbine is characterized in that flue gas discharged from the gas turbine enters a flue gas denitration system, exchanges heat with saturated steam from a high-pressure steam drum through a high-pressure boiler overheating section, exchanges heat with high-pressure boiler water from the high-pressure steam drum through a high-pressure boiler evaporation section, enters a denitration reaction bed layer through a fan to contact with a catalyst for denitration reaction, exchanges heat with low-pressure boiler water from a low-pressure steam drum through a low-pressure boiler evaporation section, and is discharged through a chimney after the high-pressure boiler coal-saving section exchanges heat with the high-pressure boiler water.
2. The process for efficient waste heat recovery and denitration of gas turbine exhaust as claimed in claim 1, wherein said low pressure boiler water from the low pressure drum is returned to the low pressure drum after heat exchange with flue gas, and the generated low pressure steam enters a low pressure steam pipe network.
3. The process for efficient waste heat recovery and denitration of gas turbine exhaust gas as claimed in claim 1, wherein the high pressure boiler water after heat exchange with the flue gas in the coal saving section of the high pressure boiler passes through the high pressure drum and enters the evaporation section of the high pressure boiler, and after heat exchange with the flue gas, returns to the high pressure drum, and then forms saturated steam which enters the evaporation section of the high pressure boiler to exchange heat with the flue gas to generate superheated steam, and the superheated steam enters the temperature and pressure reducing device to generate saturated steam which enters the high pressure steam pipe network.
4. The process for efficient waste heat recovery and denitration of gas turbine exhaust gas as claimed in claim 1, wherein said flue gas denitration system further comprises an emergency discharge chimney disposed at one side of the flue gas inlet duct and an emergency discharge valve for controlling the emergency discharge chimney.
5. The process for efficient waste heat recovery and denitration of gas turbine exhaust as claimed in claim 1, wherein the denitration catalyst used in the denitration reaction bed is an SCR denitration catalyst.
6. The process for efficient waste heat recovery and denitration of gas turbine exhaust as claimed in claim 1, wherein two fans are provided, one fan for standby.
CN201910793178.9A 2019-08-26 2019-08-26 Process for efficient waste heat recovery and denitration combination of gas turbine tail gas Pending CN111174189A (en)

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CN201910793178.9A CN111174189A (en) 2019-08-26 2019-08-26 Process for efficient waste heat recovery and denitration combination of gas turbine tail gas

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CN201910793178.9A CN111174189A (en) 2019-08-26 2019-08-26 Process for efficient waste heat recovery and denitration combination of gas turbine tail gas
PCT/CN2019/124941 WO2021036099A1 (en) 2019-08-26 2019-12-12 Combined process for high-efficient waste heat recovery and denitration of exhaust gas of gas turbine

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CN1215818A (en) * 1997-10-08 1999-05-05 东芝株式会社 Exhaust heat recovery boiler
CN105716052A (en) * 2014-12-02 2016-06-29 上海优华系统集成技术有限公司 High-temperature flue gas heat joint optimization system
CN207471512U (en) * 2017-11-09 2018-06-08 贵州毅达环保股份有限公司 A kind of boiler evaporator system
CN110038414A (en) * 2019-03-25 2019-07-23 华电电力科学研究院有限公司 A kind of gas turbine flue gas denitrating system and method for denitration

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JPS609201B2 (en) * 1975-09-29 1985-03-08 Hitachi Ltd
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JP3727668B2 (en) * 1993-09-17 2005-12-14 三菱重工業株式会社 Exhaust gas boiler
CN102512954A (en) * 2011-12-23 2012-06-27 东方电气集团东方锅炉股份有限公司 Heat recovery steam generator flue gas denitration apparatus
CN105526578B (en) * 2016-01-28 2018-02-23 南京华电节能环保设备有限公司 Coke-oven plant's flue gas energy-conserving and environment-protective comprehensive treatment device and technique

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1215818A (en) * 1997-10-08 1999-05-05 东芝株式会社 Exhaust heat recovery boiler
CN105716052A (en) * 2014-12-02 2016-06-29 上海优华系统集成技术有限公司 High-temperature flue gas heat joint optimization system
CN207471512U (en) * 2017-11-09 2018-06-08 贵州毅达环保股份有限公司 A kind of boiler evaporator system
CN110038414A (en) * 2019-03-25 2019-07-23 华电电力科学研究院有限公司 A kind of gas turbine flue gas denitrating system and method for denitration

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