CN111304393A - Method for checking main technological parameters of plate heat exchanger - Google Patents
Method for checking main technological parameters of plate heat exchanger Download PDFInfo
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- CN111304393A CN111304393A CN202010261586.2A CN202010261586A CN111304393A CN 111304393 A CN111304393 A CN 111304393A CN 202010261586 A CN202010261586 A CN 202010261586A CN 111304393 A CN111304393 A CN 111304393A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B9/00—Stoves for heating the blast in blast furnaces
- C21B9/14—Preheating the combustion air
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
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Abstract
The invention relates to a method for checking main process parameters of a plate heat exchanger, which is characterized in that a reference value and a target value of an outlet end are set and compared with an actual measured temperature flow value, and the target value of the temperature of a flue gas outlet is taken as a target to redistribute the flow of flue gas. The operation state is determined by measuring the numerical values of air, coal gas and flue gas, the temperature value of a flue gas outlet is set, and then the flue gas is reasonably distributed, so that the operation resistance loss of the heat exchanger is avoided, and the service life is prolonged.
Description
Technical Field
The invention relates to the technical field of hot blast stoves, in particular to a method for checking main process parameters of a plate heat exchanger.
Background
The plate type heat exchanger of the blast furnace hot blast stove is an advanced high-efficiency energy-saving heat exchanger at present, has the advantages of high heat transfer efficiency, low pressure drop, high temperature resistance, compact structure, corrosion resistance, long service life, difficult dust deposition and the like, and is widely applied. These parameters, if not accurately verified, can have the following effects: the temperature of the preheated air or coal gas cannot reach the preset target and benefit, and the air temperature and the fuel cost of the blast furnace are influenced; the temperature of the preheated flue gas exceeds the standard, so that the waste heat recovery effect cannot reach the preset target; the temperature of the preheated flue gas is ultralow (particularly a gas preheater), the long-time operation of the preheater shortens the service life of the preheater, and even causes safety accidents; because the flow of the combustion air, the gas and the flue gas is not accurately checked, the actual running resistance loss of the combustion air, the gas and the flue gas is possibly caused to exceed the design value, and the normal burning of the hot blast stove is influenced.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a method for checking main process parameters of a plate heat exchanger.
The technical purpose of the invention is realized by the following technical scheme: a checking method for main process parameters of a plate heat exchanger comprises the following determination steps:
s1: setting reference values, wherein the annual average temperature of the combustion air inlet temperature, the coal gas inlet temperature and the flue gas inlet temperature is used as the reference values, and the annual average hourly flow of the coal gas flow is 1.2-1.3 times as large as the annual average hourly flow of the coal gas flow; taking the flue gas flow as a reference value according to a coefficient of 1.50-1.80 of the checked gas flow; the air flow is based on 1.2-1.3 times of annual average hourly flow, and then the upper limit value of the air-fuel ratio of the hot blast stove is used as a reference value;
s2: measuring actual values, and measuring the actual values of combustion air inlet temperature, coal gas inlet temperature, flue gas inlet temperature, coal gas flow and combustion air flow;
s3: and checking the actual numerical value, comparing the actual numerical value with the reference numerical value, judging whether the actual numerical value is too low, calculating the respective flue gas distribution amount and the designed heat exchange amount of the air preheater and the coal gas preheater and the combustion air for the hot blast stove after preheating and the coal gas outlet temperature by taking the flue gas outlet temperature reaching a certain numerical value as a target, and redistributing the flue gas flow to ensure that the flue gas outlet temperature reaches the numerical value.
In one embodiment, in the step S3, the atmospheric temperature in winter is considered to be lower than the annual average atmospheric temperature by more than 5 to 10 ℃, and the inlet temperature of the combustion air is checked at a temperature of 5 to 10 ℃ lower than the annual average temperature; the temperature of the gas inlet is the annual average temperature of the gas pipe network of the hot blast furnace or the blast furnace gas after the gas pipe network or the blast furnace gas is subjected to residual pressure such as TRT and the like for power generation; the temperature of the flue gas inlet is the average temperature of the working condition of the hot blast stove in normal time.
In one embodiment, the combustion air for burning the hot blast stove and the target temperature of the gas outlet are both: more than 190 ℃; the flow resistance loss values of combustion air, coal gas and flue gas are all controlled to be less than or equal to 800 Pa.
In conclusion, the invention has the following beneficial effects:
firstly, the checking of the heat exchange efficiency is completed by comparing the data of the combustion air inlet temperature, the coal gas inlet temperature, the flue gas inlet temperature, the coal gas flow, the combustion air flow and the like with the reference data;
secondly, selecting a proper temperature and flow standard aiming at the heat exchange efficiency so as to ensure the heat exchange efficiency;
thirdly, avoid causing the damage of equipment because the parameter is not up to standard, influence the availability factor and the life of equipment.
Drawings
FIG. 1 is a schematic diagram of the heat exchanger of the present invention;
FIG. 2 is a process flow diagram of the present invention.
In the figure: 1-a first flue gas preheater, 2-a second flue gas preheater, 3-a gas preheater, 4-an air preheater, 5-a flue gas inlet, 6-a flue gas outlet, 7-a coal gas inlet, 8-a coal gas outlet, 9-an air inlet, 10-an air outlet, A1-an air inlet measuring point, A2-an air outlet measuring point, B1-a coal gas inlet measuring point, B2-a coal gas outlet measuring point, C1-a flue gas inlet measuring point, and C2-a flue gas outlet measuring point.
Detailed Description
The invention is described in detail below with reference to the figures and examples.
It should be noted that all the directional terms such as "upper" and "lower" referred to herein are used with respect to the view of the drawings, and are only for convenience of description, and should not be construed as limiting the technical solution.
Referring to fig. 1, a plate heat exchanger, including parallelly connected flue gas preheater 1 and two 2 of flue gas preheater, flue gas preheater 1 links to each other with gas heater 3 and carries out the heat transfer, flue gas preheater two 2 links to each other with air heater 4 and carries out the heat transfer, and flue gas preheater 1 and two 2 one ends of flue gas preheater are provided with flue gas inlet 5, flue gas inlet 5 is divided into two, communicate with flue gas preheater 1 and two 2 of flue gas preheater respectively, flue gas outlet 6 is converged into to flue gas preheater 1 and two 2 other ends of flue gas preheater, gas heater 3 is provided with gas inlet 7 and gas outlet 8, air heater 4 is provided with air inlet 9 and air outlet 10. From the above, when flue gas exchanges heat with combustion air and coal gas, temperature and flow play decisive factors, influence heat exchange efficiency.
The working efficiency can be obtained by measuring the entering temperature and flow of air, coal gas and flue gas, and the flow and temperature are redistributed according to the reference value so as to achieve the optimal heat exchange efficiency.
Referring to fig. 2, a method for checking main process parameters of a plate heat exchanger includes the following steps:
s1: setting reference values, wherein the annual average temperature of the combustion air inlet temperature, the coal gas inlet temperature and the flue gas inlet temperature is used as the reference values, and the annual average hourly flow of the coal gas flow is 1.2-1.3 times as large as the annual average hourly flow of the coal gas flow; taking the flue gas flow as a reference value according to a coefficient of 1.50-1.80 of the checked gas flow; the air flow is based on 1.2-1.3 times of annual average hourly flow, and then the upper limit value of the air-fuel ratio of the hot blast stove is used as a reference value;
s2: measuring actual values, measuring combustion air inlet temperature and flow at air inlet measurement point a1 and combustion air outlet temperature and flow at air outlet measurement point a2 in fig. 1; measuring the temperature and flow rate of the gas inlet at a gas inlet measuring point B1 and the temperature and flow rate of the gas outlet at a gas outlet measuring point B2; the temperature and the flow of the flue gas inlet are measured at a flue gas inlet measuring point C1, the temperature and the flow of the flue gas outlet are measured at a flue gas outlet measuring point C2, and temperature detection equipment and flow detection equipment are respectively arranged at each measuring point to realize parameter measurement;
s3: checking an actual numerical value, comparing the actual numerical value with a reference numerical value, judging whether the actual numerical value is too low, respectively calculating the respective flue gas distribution amount and the designed heat exchange amount of an air preheater and a gas preheater, combustion air for a preheated hot blast stove burner and the gas outlet temperature by taking the flue gas outlet temperature of 140-150 ℃ as a target, and ensuring that the flue gas outlet temperature is within an interval of 140-150 ℃ by regulating and controlling the flue gas flow corresponding to the air preheater or the gas preheater; and smoke control valves are respectively arranged on the first smoke preheater and the second smoke preheater, and the smoke flow is redistributed by adjusting the sizes of the control valves.
By adopting the above scheme, compare the back through actual numerical value and reference value to guarantee equipment life and set for the flue gas outlet temperature as the target, the flue gas flow with at least one preheater of air heater or coal gas preheater is strengthened to rethread regulation and control flue gas valve, realizes reaching the target of flue gas outlet temperature, improves life.
In the step S3, the atmospheric temperature in winter is considered to be lower than the annual average atmospheric temperature by more than 5-10 ℃, and the inlet temperature of combustion-supporting air is checked according to the annual average temperature which is lower than 5-10 ℃; the temperature of the gas inlet is the annual average temperature of the gas pipe network of the hot blast furnace or the blast furnace gas after the gas pipe network or the blast furnace gas is subjected to residual pressure such as TRT and the like for power generation; the temperature of the flue gas inlet is the average temperature of the working condition of the hot blast stove in normal time.
The combustion-supporting air for the burning of the hot blast stove and the target temperature of a coal gas outlet are as follows: more than 190 ℃; the flow resistance loss values of combustion air, coal gas and flue gas are all controlled to be less than or equal to 800 Pa.
Example 1
Checking the inlet temperatures of combustion air, coal gas and flue gas at 25-30 ℃, 35-45 ℃ and 290-300 ℃; checking the gas flow according to the annual average hourly flow rate which is 1.2-1.3 times; the flow rate of the combustion-supporting air is checked according to the upper limit value of the air-fuel ratio of the hot blast stove burning furnace on the basis of 1.2-1.3 times of the annual average hourly flow rate; checking the flow rate of the flue gas according to a coefficient of 1.50-1.80 of the checked gas flow rate; the target temperature of the flue gas outlet is 140-150 ℃, the respective flue gas distribution amount and the designed heat exchange amount of the air preheater and the gas preheater 3 are respectively calculated, the flue gas flow is regulated and controlled, and the flue gas outlet temperature is in a range of 140-150 ℃; the combustion-supporting air for the preheated hot blast stove burning furnace and the coal gas outlet target temperature are both as follows: more than 190 ℃; meanwhile, the actual running resistance loss values of combustion air, coal gas and flue gas are all controlled to be less than or equal to 800Pa, and the requirements of normal burning of the hot blast stove are met.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (3)
1. A method for checking main process parameters of a plate heat exchanger is characterized in that the measuring steps comprise:
s1: setting reference values, wherein the annual average temperature of the combustion air inlet temperature, the coal gas inlet temperature and the flue gas inlet temperature is used as the reference values, and the annual average hourly flow of the coal gas flow is 1.2-1.3 times as large as the annual average hourly flow of the coal gas flow; taking the flue gas flow as a reference value according to a coefficient of 1.50-1.80 of the checked gas flow; the air flow is based on 1.2-1.3 times of annual average hourly flow, and then the upper limit value of the air-fuel ratio of the hot blast stove is used as a reference value;
s2: measuring actual values, and measuring the actual values of combustion air inlet temperature, coal gas inlet temperature, flue gas inlet temperature, coal gas flow and combustion air flow;
s3: and checking the actual numerical value, comparing the actual numerical value with the reference numerical value, judging whether the actual numerical value is too low, calculating the respective flue gas distribution amount and the designed heat exchange amount of the air preheater and the coal gas preheater and the combustion air for the hot blast stove after preheating and the coal gas outlet temperature by taking the flue gas outlet temperature reaching a certain numerical value as a target, and redistributing the flue gas flow to ensure that the flue gas outlet temperature reaches the numerical value.
2. The method for checking the main process parameters of the plate heat exchanger according to claim 1, wherein in the step S3, the atmospheric temperature in winter is considered to be lower than the annual average atmospheric temperature by more than 5-10 ℃, and the inlet temperature of combustion air is checked at 5-10 ℃ lower than the annual average temperature; the temperature of the gas inlet is the annual average temperature of the gas pipe network of the hot blast furnace or the blast furnace gas after the gas pipe network or the blast furnace gas is subjected to residual pressure such as TRT and the like for power generation; the temperature of the flue gas inlet is the average temperature of the working condition of the hot blast stove in normal time.
3. The method for checking the main process parameters of the plate heat exchanger according to claim 1, wherein the target temperatures of combustion air for the burning furnace of the hot blast stove and the target temperature of a coal gas outlet are both: more than 190 ℃; the flow resistance loss values of combustion air, coal gas and flue gas are all controlled to be less than or equal to 800 Pa.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010261586.2A CN111304393B (en) | 2020-04-02 | 2020-04-02 | Method for checking main technological parameters of plate heat exchanger |
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| CN202010261586.2A CN111304393B (en) | 2020-04-02 | 2020-04-02 | Method for checking main technological parameters of plate heat exchanger |
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| CN111304393B CN111304393B (en) | 2021-11-16 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114048635A (en) * | 2022-01-11 | 2022-02-15 | 天津国能津能滨海热电有限公司 | Performance detection method and device of air preheater and electronic equipment |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1557972A (en) * | 2004-01-16 | 2004-12-29 | 冶金自动化研究设计院 | Optimizing control method for hybrid type blast furnace hot blast stove |
| UA81876C2 (en) * | 2006-12-25 | 2008-02-11 | Государственное Предприятие "Украинский Институт По Проектированию Металлургических Заводов" | Device for utilization of heat of blast-furnace airheaters outgoing combustion gases |
| CN103131812A (en) * | 2011-12-01 | 2013-06-05 | 上海雷林工程技术有限公司 | Plate-type air and coal gas double-preheating system for hot blast stove |
| CN105157057A (en) * | 2015-08-28 | 2015-12-16 | 莱芜钢铁集团电子有限公司 | Combustion control method and system for hot blast heater |
| CN110533270A (en) * | 2018-05-28 | 2019-12-03 | 广东韶钢松山股份有限公司 | A kind of blast funnace hot blast stove preheater operating status appraisal procedure |
| CN110699502A (en) * | 2019-09-30 | 2020-01-17 | 鞍钢集团自动化有限公司 | Method for high-precision prediction of gas consumption of blast furnace hot blast stove |
| CN210127253U (en) * | 2019-05-17 | 2020-03-06 | 南京华电节能环保设备有限公司 | Load-adjustable heating medium type double-preheating heat exchanger for blast furnace hot blast stove |
-
2020
- 2020-04-02 CN CN202010261586.2A patent/CN111304393B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1557972A (en) * | 2004-01-16 | 2004-12-29 | 冶金自动化研究设计院 | Optimizing control method for hybrid type blast furnace hot blast stove |
| UA81876C2 (en) * | 2006-12-25 | 2008-02-11 | Государственное Предприятие "Украинский Институт По Проектированию Металлургических Заводов" | Device for utilization of heat of blast-furnace airheaters outgoing combustion gases |
| CN103131812A (en) * | 2011-12-01 | 2013-06-05 | 上海雷林工程技术有限公司 | Plate-type air and coal gas double-preheating system for hot blast stove |
| CN105157057A (en) * | 2015-08-28 | 2015-12-16 | 莱芜钢铁集团电子有限公司 | Combustion control method and system for hot blast heater |
| CN110533270A (en) * | 2018-05-28 | 2019-12-03 | 广东韶钢松山股份有限公司 | A kind of blast funnace hot blast stove preheater operating status appraisal procedure |
| CN210127253U (en) * | 2019-05-17 | 2020-03-06 | 南京华电节能环保设备有限公司 | Load-adjustable heating medium type double-preheating heat exchanger for blast furnace hot blast stove |
| CN110699502A (en) * | 2019-09-30 | 2020-01-17 | 鞍钢集团自动化有限公司 | Method for high-precision prediction of gas consumption of blast furnace hot blast stove |
Non-Patent Citations (2)
| Title |
|---|
| 杨军等: "韶钢3200m3高炉热风炉板式换热器改造", 《南方金属》 * |
| 王洪军: "板式换热器在高炉热风炉中的应用", 《冶金动力》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114048635A (en) * | 2022-01-11 | 2022-02-15 | 天津国能津能滨海热电有限公司 | Performance detection method and device of air preheater and electronic equipment |
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