CN116046092A - Method for measuring flue gas amount of boiler chimney - Google Patents
Method for measuring flue gas amount of boiler chimney Download PDFInfo
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- CN116046092A CN116046092A CN202211566647.1A CN202211566647A CN116046092A CN 116046092 A CN116046092 A CN 116046092A CN 202211566647 A CN202211566647 A CN 202211566647A CN 116046092 A CN116046092 A CN 116046092A
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- flue gas
- water
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
- G01F1/86—Indirect mass flowmeters, e.g. measuring volume flow and density, temperature or pressure
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- Measuring Temperature Or Quantity Of Heat (AREA)
Abstract
The invention discloses a method for measuring the flue gas quantity of a boiler chimney, wherein a measuring device is arranged in the chimney, the measuring device comprises two water-cooling walls, the center of a hinge of each water-cooling wall is coincident with the center of the chimney, cooling pipes are arranged on the water-cooling walls, the arrangement direction of the cooling pipes is parallel to the flow direction of flue gas, and a fan-shaped columnar measuring area is formed by the water-cooling walls and the wall surface of the chimney; the inlet of the cooling pipe is provided with a flowmeter, and the positions of the flue gas inlet and outlet in the measuring area and the positions of the water inlet and outlet in the cooling pipe are provided with thermometers; cooling water is introduced into the cooling pipe to cool the flue gas in the measuring area; and obtaining the mass flow of the flue gas flowing through the section of the measuring area through the cooling water flow, the specific heat capacity of the cooling water, the inlet and outlet temperatures of the flue gas and the specific heat capacity of the flue gas, thereby obtaining the mass flow of the flue gas in the whole chimney. The invention has simple operation and convenient arrangement of the measuring device, and is also suitable for measuring the flow of the large-section flow field.
Description
Technical Field
The invention relates to a method for calculating the flue gas amount, in particular to a method for measuring the flue gas amount of a boiler chimney.
Background
At present, the measurement of the boiler flue gas emission mainly depends on a dynamic pressure measurement device or a device with damping, is suitable for the flow measurement of a uniform flow field or a small-section flow field, and is not suitable for the flow measurement of a large-section flow field.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a method for measuring the flue gas amount of a boiler chimney.
The invention solves the problems by adopting the following technical scheme: the method is characterized in that a measuring device is adopted and is arranged in a chimney, the measuring device comprises two water-cooled walls, the two water-cooled walls are connected through a hinge, the center of the hinge is coincident with the center of the chimney, cooling pipes are arranged on the water-cooled walls, the arrangement direction of the cooling pipes is parallel to the flow direction of smoke, and a fan-shaped columnar measuring area is formed by the water-cooled walls and the wall surface of the chimney in a surrounding mode;
the inlet of the cooling pipe is provided with a flowmeter, and the positions of the flue gas inlet and outlet in the measuring area and the positions of the water inlet and outlet in the cooling pipe are provided with thermometers; in the measurement range, the specific heat capacity of the flue gas is considered to be a fixed value of 1.05kJ/kg/K, and the specific heat capacity of the cooling water is considered to be a fixed value of 4.18kJ/kg/K;
cooling water is introduced into the cooling pipe, the temperature of a cooling water inlet of the cooling pipe is far lower than the temperature of the flue gas, the flue gas in the measuring area is cooled by the cooling water, and the mass flow of the flue gas flowing through the section of the measuring area can be obtained through the flow rate of the cooling water, the specific heat capacity of the cooling water, the temperature of a cooling water inlet and outlet, the temperature of a flue gas inlet and outlet and the specific heat capacity of the flue gas; the smoke flow conditions in other fan-shaped areas in the chimney are approximately considered to be the same as those in the measuring area, and the smoke mass flow in the whole chimney is obtained according to the smoke flow in the measuring area and the included angle alpha between the two water cooling walls.
Further, the section of the chimney is divided into a measuring area by the measuring device, and the flue gas flow velocity field of other fan-shaped section areas is considered to be the same as the measuring area.
Further, the mass flow of the flue gas flowing through the section of the measuring area can be obtained through the cooling water flow, the specific heat capacity of the cooling water, the temperature of the cooling water inlet and outlet, the temperature of the flue gas inlet and outlet and the specific heat capacity of the flue gas, and then the mass flow of the flue gas of the chimney can be obtained by expanding the mass flow of the flue gas to the section of the whole chimney according to the equal proportion of the included angle alpha between the two water cooling walls.
Compared with the prior art, the invention has the following advantages and effects: the invention has simple operation and convenient arrangement of the measuring device, and is also suitable for measuring the flow of the large-section flow field.
Drawings
FIG. 1 is a cross-sectional view of a horizontal arrangement of a measuring device in an embodiment of the present invention.
Fig. 2 is a horizontal cross-sectional view of a measuring device according to an embodiment of the present invention.
Fig. 3 is a schematic view of a longitudinal arrangement of a measuring device according to an embodiment of the present invention.
In the figure: chimney 1, water-cooled wall 2, cooling tube 3, hinge 4, export flue gas temperature measurement station 11, import flue gas temperature measurement station 12, import temperature measurement station 13, flow measurement station 14, export temperature measurement station 15.
Detailed Description
The present invention will be described in further detail by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and not limited to the following examples.
Examples
As shown in fig. 1, the measuring device is mounted on the inner side of the chimney 1, the end of the water-cooled wall 2, which is the main component of the measuring device, is mounted on the inner wall of the chimney 1, the two water-cooled walls 2 are connected by a hinge 4, and the included angle α between the two water-cooled walls 2 should be as small as possible, so as to improve the measuring accuracy. The length L of the water wall 2 should be half the inner diameter R of the chimney 1.
As shown in fig. 2, the measuring device mainly comprises two water-cooled walls 2 and cooling pipes 3 welded on the wall surfaces of the water-cooled walls 2, wherein the outer diameter of each cooling pipe 3 is d, the center-to-center distance of each cooling pipe 3 is s, and the two water-cooled walls 2 are connected through a hinge 4.
As shown in fig. 3, taking a single water-cooled wall 2 as an example, an outlet flue gas temperature measuring point 11 is arranged on the upper side of the water-cooled wall 2, an inlet flue gas temperature measuring point 12 is arranged on the lower side of the water-cooled wall 2, a cooling pipe 3 is welded on the wall surface of the water-cooled wall 2, an inlet water temperature measuring point 13 and a flow measuring point 14 are arranged on the inlet side of the cooling pipe 3, and an outlet water temperature measuring point 15 is arranged on the outlet side.
The water cooling wall 2 and the wall surface of the chimney 1 form a fan-shaped columnar measuring area, boiler flue gas enters from the lower side of the measuring area, cooling water flows through the cooling pipe 3 at a certain flow rate, the cooling water is heated by the flue gas flowing through the measuring area, and the flue gas is cooled. The wall surface of the water-cooled wall 2 is provided with a heat insulation layer to insulate the heat of the flue gas outside the measuring area. The degree of the included angle alpha between the two water-cooled walls 2 can be obtained through measurement, the cooling water inlet temperature t1, the cooling water outlet temperature t2, the cooling water flow q, the flue gas inlet temperature t3 and the flue gas outlet temperature t4 are considered to be the constant value of 1.05kJ/kg/K, and the specific heat capacity of the cooling water is considered to be the constant value of 4.18kJ/kg/K. The flow formula of the flue gas flowing through the measurement area is as follows:
what is not described in detail in this specification is all that is known to those skilled in the art.
Although the present invention has been described with reference to the above embodiments, it should be understood that the invention is not limited to the embodiments described above, but is capable of modification and variation without departing from the spirit and scope of the present invention.
Claims (3)
1. The method for measuring the flue gas amount of the boiler chimney is characterized by comprising a measuring device, wherein the measuring device is arranged in the chimney (1), the measuring device comprises two water-cooled walls (2), the two water-cooled walls (2) are connected through a hinge (4), the center of the hinge (4) coincides with the center of the chimney (1), a cooling pipe (3) is arranged on the water-cooled walls (2), the arrangement direction of the cooling pipe (3) is parallel to the flow direction of flue gas, and a fan-shaped columnar measuring area is formed by the water-cooled walls (2) and the wall surface of the chimney (1) in a surrounding mode;
the inlet of the cooling pipe (3) is provided with a flowmeter, and the positions of the flue gas inlet and outlet in the measuring area and the positions of the water inlet and outlet of the cooling pipe (3) are provided with thermometers; in the measuring range, the specific heat capacity of the flue gas is considered to be a fixed value, and the specific heat capacity of the cooling water is considered to be a fixed value;
cooling water is introduced into the cooling pipe (3), the temperature of a cooling water inlet of the cooling pipe (3) is lower than the temperature of the flue gas, the flue gas in the measuring area is cooled by the cooling water, and the mass flow of the flue gas flowing through the section of the measuring area can be obtained through the flow rate of the cooling water, the specific heat capacity of the cooling water, the temperature of a cooling water inlet and outlet, the temperature of a flue gas inlet and outlet and the specific heat capacity of the flue gas; the flue gas flow conditions in other fan-shaped areas in the chimney (1) are approximately considered to be the same as those in the measurement area, and the flue gas mass flow in the whole chimney (1) is obtained according to the flue gas flow in the measurement area and the included angle alpha between the two water cooling walls (2).
2. The method for measuring the flue gas amount of a boiler chimney according to claim 1, wherein the measuring device divides the section of the chimney (1) into measuring areas, and the flue gas flow velocity field of other fan-shaped section areas is considered to be the same as the measuring areas.
3. The method for measuring the flue gas amount of the boiler chimney according to claim 1 or 2, wherein the flue gas mass flow flowing through the section of the measuring area can be obtained through cooling water flow, cooling water specific heat capacity, cooling water inlet and outlet temperature, flue gas inlet and outlet temperature and flue gas specific heat capacity, and then the flue gas mass flow of the chimney (1) is obtained by expanding the flue gas mass flow to the section of the whole chimney (1) according to the equal proportion of an included angle alpha between two water cooling walls (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211566647.1A CN116046092A (en) | 2022-12-07 | 2022-12-07 | Method for measuring flue gas amount of boiler chimney |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211566647.1A CN116046092A (en) | 2022-12-07 | 2022-12-07 | Method for measuring flue gas amount of boiler chimney |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116046092A true CN116046092A (en) | 2023-05-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211566647.1A Pending CN116046092A (en) | 2022-12-07 | 2022-12-07 | Method for measuring flue gas amount of boiler chimney |
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| Country | Link |
|---|---|
| CN (1) | CN116046092A (en) |
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2022
- 2022-12-07 CN CN202211566647.1A patent/CN116046092A/en active Pending
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