A steam heating network operation regulation system and method based on condensation coefficient

Abstract

The present invention discloses a steam heating network operation regulation system and method based on the condensation coefficient, which belongs to the field of steam heating. The present invention calculates the corresponding steam heating network condensation coefficient η based on the historical operation data of the steam heating network, and uses the minimum value of the condensation coefficient during safe operation as the threshold value η of the steam heating network condensation coefficient. min Calculate the condensation coefficient value η under actual operating conditions and compare η with η min The difference between the two values is used to calculate the water spray cooling amount for the steam heating network, achieving primary adjustment of the cooling amount. Based on actual pipe loss feedback, the cooling water adjustment amount is compared with the corresponding pipe loss change, enabling secondary adjustment of the cooling water amount. This invention simultaneously considers the water hammer risk caused by steam condensation in the heating network and the pipe loss changes caused by water spray cooling. Based on the calculated results, the water hammer risk in the steam heating network during water spray cooling can be controlled within a safe range while maintaining a high level of overall heating economic efficiency.

Description

Technical Field

[0001] The present invention belongs to the field of steam heating, and in particular relates to a steam heating network operation regulation system and method based on a condensation coefficient. Background Art

[0002] A heating network is a crucial component of a centralized heating system, primarily responsible for heat transmission. When steam is the transmission medium, it is called a steam heating network. When the combined heat demand of heat users and the total heat losses of the steam heating network are less than the heat provided by the centralized heat source, water spraying can often be used to reduce the heat source steam parameters and improve the economic efficiency of the centralized heat source's heating.

[0003] Water hammer is a phenomenon in which the liquid flow rate in a closed pipe changes dramatically, causing a sharp fluctuation in liquid pressure. This can lead to severe vibrations in the piping system and, in severe cases, damage to the pipes. Therefore, water hammer should be avoided as much as possible during piping system operation. During the actual operation of a steam heating network, due to heat loss, the steam temperature drops, and steam condensation is very likely to occur. A portion of the condensed steam is discharged from the steam heating network through equipment such as steam traps, while the remaining portion remains in the steam heating network. Especially for thermal pipelines using water spray cooling, as the steam parameters continue to drop, the amount of steam condensation and the amount of condensed steam remaining in the steam heating network will increase accordingly, increasing the risk of water hammer in the steam heating network.

[0004] Currently, the calculation of water spray cooling capacity is primarily based on direct energy conservation analysis of the steam heating network, resulting in relatively crude results. Furthermore, this calculation method has the following drawbacks: 1) It fails to consider the relationship between water spray cooling and fluctuations in water hammer risk. Previous calculation methods have not accounted for the water hammer risk associated with condensed steam remaining in the steam heating network. Consequently, water spray cooling based on the calculated results may trigger water hammer in the steam heating network. 2) The economic benefits of heating are low. Since the addition of cooling water to the steam heating network alters the steam parameters and flow rate within the pipelines, pipe losses in the steam heating network also change accordingly. The resulting economic losses may outweigh the additional economic benefits of water spray cooling, resulting in a reduction in the overall economic benefits of heating.

[0005] Therefore, how to determine the amount of water spray cooling in the steam heating network so that the water hammer risk of the steam heating network is low while the overall heating economic benefits remain at a high level becomes a problem that needs to be solved. Summary of the Invention

[0006] The purpose of the present invention is to overcome the defects in the prior art and provide a steam heating network operation regulation system and method based on the condensation coefficient.

[0007] The specific technical solutions adopted in the present invention are as follows:

[0008] In a first aspect, the present invention provides a steam heating network operation regulation system based on a condensation coefficient, comprising a steam heating network trunk line, a heat user branch line, an overheating test section, a thermal parameter monitoring system, a thermal parameter monitoring and control terminal, and a water spray cooling device;

[0009] The steam heating network trunk line is connected to each heat user through several heat user branches. An overheating section test starting point and an overheating section test end point are arranged on the steam heating network trunk line. The pipeline between the overheating section test starting point and the overheating section test end point is the overheating test section; thermal parameter monitoring systems are respectively arranged at the overheating section test starting point, the overheating section test end point, the heat user and the external environment. The thermal parameter monitoring system is used to obtain temperature, pressure and flow data; the data collected by the thermal parameter monitoring system is finally transmitted and stored in the thermal parameter monitoring and control terminal; a water spray cooling device is provided at the front end of the steam heating network trunk line; the water spray cooling device is connected to the thermal parameter monitoring and control terminal, and is used to adjust the water flow according to the data collected by the thermal parameter monitoring and control terminal.

[0010] Preferably, the pipe length of the superheat test section is ≥700m or the steam temperature difference between the superheat test starting point and the superheat test end point is ≥3°C; the steam superheat at the superheat test end point is ≥60°C, and the superheat test section contains at least one of each type of pipe accessories on the steam heating network trunk line.

[0011] Preferably, the main line of the steam heating network is a branch-like heating network with a single heat source or multiple heat sources.

[0012] In a second aspect, the present invention provides a method for regulating a steam heating network operation regulation system based on a condensation coefficient according to any one of the first aspects, as follows:

[0013] S1. Determine whether the steam in the superheat test section is overheated; if so, proceed to steps S2 to S6; if not, end the adjustment process;

[0014] S2, thermal parameter monitoring and control terminal based on the superheating section test starting steam temperature, steam pressure and flow G s , the steam temperature and steam pressure at the end of the superheat section test, as well as the structural dimensions of the superheat section test section, are used to obtain the enthalpy drop loss q of the superheat section test section. t ;

[0015] S3, thermal parameter monitoring and control terminal reads the heat source steam temperature t s , steam temperature in superheat test section t e and steam temperature t of each heat user i , calculate the steam heat network temperature correction coefficient ε, and then calculate the enthalpy drop loss q of the entire pipeline;

[0016] S4. Based on the actual historical operation data of the steam heating network, the corresponding steam heating network condensation coefficient η is calculated, and the minimum value under safe operation conditions is the threshold value η of the steam heating network condensation coefficient min ;

[0017] S5. By comparing η min and η to determine the primary adjustment amount G of the cooling water sprayed by the water cooling device j , as follows:

[0018]

[0019] Where ΔG is the total condensation amount;

[0020] When η≥η min When η<η, step S6 is performed to adjust the cooling water flow rate for the second time; min When , the adjustment process ends;

[0021] S6, considering the economic margin, adjust the flow rate G of the primary cooling water j The economic coefficient m is multiplied by the calculated product and the change value ΔG of the actual pipe loss of the steam heating network is compared. gs The difference between them is used as the basis for the secondary regulation flow M of the desuperheating water in the steam heating network, as follows:

[0022] M=mG j -ΔG gs .

[0023] Preferably, the method for determining whether the steam is superheated in step S1 is as follows:

[0024] According to the steam thermal parameter data measured by the thermal parameter monitoring system at the superheat section test starting point and the superheat section test end point, it is judged whether the superheat section test end point meets the steam superheat degree ≥ 60℃ and whether the temperature difference between it and the superheat section test starting point is ≥ 3℃.

[0025] As a preference, in step S2, the enthalpy drop loss q in the overheating test section is t The calculation formula is as follows:

[0026]

[0027] Where: h s and h e are the steam enthalpy values at the start and end of the superheat test section, respectively. The steam enthalpy values are calculated using the corresponding steam temperature and steam pressure. t It is the outer surface area of the insulation layer of the overheat test section.

[0028] Preferably, in step S3,

[0029] The calculation formula of steam heating network temperature correction coefficient ε is as follows:

[0030]

[0031] The calculation formula for the enthalpy drop loss q of the entire pipeline is as follows:

[0032] q=εq t ,

[0033] Where, T a Indicates the external ambient temperature.

[0034] Preferably, in step S4, the steam heating network condensation coefficient η is defined as the actual pipe loss G of the steam heating network. gs The ratio of the total condensation volume ΔG to the total condensation volume ΔG is determined by the corrected enthalpy drop loss q in step S3, as follows:

[0035]

[0036] Where: A is the total surface area of the pipeline being tested, m 2 ; G i is the flow value of each heat user; h s is the enthalpy of the heat source steam; h i is the enthalpy of the hot user steam; h w is the saturated steam enthalpy corresponding to the average of the heat source and heat user pressures;

[0037] The monitoring and control terminal obtains the heat source flow G through the thermal parameter monitoring system s and the flow rate of each hot user G i , calculate the pipe loss G of the steam heating network gs :

[0038] G gs =G s -∑G i ,

[0039] Then calculate the condensation coefficient η of the steam heat network being measured:

[0040]

[0041] Threshold value η of steam heating network condensation coefficient min =MIN(η1,η2,…η N ).

[0042] Compared with the prior art, the present invention has the following beneficial effects:

[0043] 1. The method of the present invention calculates the water spray cooling amount of the steam heating network based on the condensation coefficient of the steam heating network. The result takes into account the water hammer risk caused by steam condensation in the steam heating network. According to the calculated result, the water hammer risk of the steam heating network is controlled within a reliable range when water spray cooling is performed.

[0044] 2. The method of the present invention adjusts the water spray cooling amount accordingly according to the pipe loss feedback during the actual operation of the steam heating network, which can maintain the overall heating economic benefits in a high range. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 Schematic diagram of the structure of the steam heating network operation regulation system based on the condensation coefficient of the present invention;

[0046] Figure 2 This is a flow chart of the steam heating network operation adjustment method based on the condensation coefficient of the present invention;

[0047] Figure 3 Schematic diagram of a branched steam heating network according to an embodiment of the present invention.

[0048] Explanation of the accompanying symbols: steam heating network main line 1, heat user branch line 2, heat user 3, overheating section test starting point 4, overheating section test end point 5, overheating test section 6, thermal parameter monitoring system 7, thermal parameter monitoring and control terminal 8, water spray cooling device 9. DETAILED DESCRIPTION

[0049] The present invention will be further described and illustrated below with reference to the accompanying drawings and specific embodiments. The technical features of each embodiment of the present invention may be combined accordingly, provided that there is no conflict between them.

[0050] like Figure 1 As shown, a steam heating network operation regulation system based on condensation coefficient provided by the present invention mainly includes a steam heating network trunk line 1, a heat user branch line 2, an overheating test section 6, a thermal parameter monitoring system 7, a thermal parameter monitoring control terminal 8 and a water spray cooling device 9.

[0051] Specifically, the steam heat network trunk line 1 is connected to each heat user 3 through multiple heat user branches 2. The steam heat network trunk line 1 is provided with an overheating section test starting point 4 and an overheating section test end point 5. The pipeline between the overheating section test starting point 4 and the overheating section test end point 5 serves as an overheating test section 6. Thermal parameter monitoring systems 7 are respectively arranged at the overheating section test starting point 4, the overheating section test end point 5, the heat user 3 and the external environment. The thermal parameter monitoring system 7 is used to obtain temperature, pressure and flow data at each monitoring point. The data collected by the thermal parameter monitoring system 7 is ultimately transmitted and stored in the thermal parameter monitoring control terminal 8. A water spray cooling device 9 is provided at the front end of the steam heat network trunk line 1 (i.e., near the power plant outlet). The water spray cooling device 9 is connected to the thermal parameter monitoring control terminal 8 and is used to adjust the water flow according to the data collected by the thermal parameter monitoring control terminal 8.

[0052] In actual use, the steam heating network trunk line 1 preferably adopts a single or multiple heat source branch-shaped heating pipe network. The pipe length of the superheat test section 6 should be ≥700m, or the steam temperature difference between the superheat test starting point 4 and the superheat test end point 5 should be ≥3°C. The steam superheat at the superheat test end point 5 should be ≥60°C, and the superheat test section 6 should contain at least one of each type of pipe accessories available on the steam heating network trunk line 1. The various pipe accessories here include elbows, brackets, and rotary compensators. This configuration is designed to ensure the generality of the superheat section.

[0053] like Figure 2 The figure shows a flow chart of a method for regulating the steam heating network operation regulation system. The specific regulation method is as follows:

[0054] S1. Judgment of steam superheat characteristics in superheat test section 6: If the steam superheat characteristics are met, proceed to steps S2 to S6; if the steam superheat characteristics are not met, end the adjustment process.

[0055] In actual application, the steps are as follows:

[0056] According to the steam thermal parameter data measured by the thermal parameter monitoring system 7 at the superheat section test starting point 4 and the superheat section test end point 5, it is determined whether the superheat section test end point 5 meets the steam superheat degree ≥ 60°C and whether the temperature difference between it and the superheat section test starting point 4 is ≥ 3°C.

[0057] In actual application, since the superheat section test starting point 4 is generally selected at a location with a thermal parameter monitoring system, it is not easy to set up a thermal parameter monitoring system 7 at the superheat section test end point 5. Therefore, the pressure value of the superheat section test end point 5 can also be obtained by calculation, as follows:

[0058] Based on the length, pipe diameter, steam flow rate and other data of the superheat test section 6, the pressure difference between the starting point and the end point of the superheat test section 6 is obtained, and combined with the pressure at the superheat test starting point 4, the pressure value of the superheat test end point 5 is obtained.

[0059] S2. Enthalpy drop loss test and calculation based on heat balance method: When the conditions of step S1 above are met, the thermal parameter monitoring and control terminal 8 measures the steam temperature, steam pressure and flow rate G at the starting point 4 of the superheating section. s , the steam temperature and steam pressure at the superheating section test end point 5, and the structural dimensions of the superheating test section 6, the enthalpy drop loss q of the superheating test section 6 is obtained t .

[0060] In actual application, the enthalpy drop loss q in the superheat test section 6 is t The calculation formula is as follows:

[0061]

[0062] Where: h s and h e are the steam enthalpy values at the starting point 4 and the end point 5 of the superheat test section, respectively. The steam enthalpy values are calculated by the corresponding steam temperature and steam pressure; A t is the outer surface area of the insulation layer of the overheating test section 6.

[0063] S3. Correction of average enthalpy drop loss in steam heating network: The thermal parameter monitoring and control terminal 8 reads the heat source steam temperature t s , steam temperature of superheat test section 6 t e and the steam temperature t of each heat user 3 i , the steam heat network temperature correction coefficient ε is calculated, and then the enthalpy drop loss q of the entire pipeline is calculated.

[0064] In practical application, the calculation formula of steam heating network temperature correction coefficient ε is as follows:

[0065]

[0066] The calculation formula for the enthalpy drop loss q of the entire pipeline is as follows:

[0067] q=εq t ,

[0068] Where, T a Indicates the external ambient temperature.

[0069] S4. Determine the threshold value of the steam heating network condensation coefficient: Based on a large amount of actual historical operation data of the steam heating network, calculate the corresponding steam heating network condensation coefficient η, and the minimum value under safe operating conditions is the threshold value η of the steam heating network condensation coefficient min .

[0070] That is to say, by statistically calculating the steam heating network condensation coefficient under safe operating conditions, the minimum value is the steam heating network condensation coefficient threshold η min At the same time, according to the steam parameters (including temperature and pressure values) and flow rates of the heat users and heat sources during the actual operation of the steam heating network, the corresponding heating network condensation coefficient η can be calculated.

[0071] In practical application, the condensation coefficient η of the steam heating network is defined as the actual pipe loss G of the steam heating network. gs The ratio of the total condensation volume ΔG to the total condensation volume ΔG is determined by the corrected enthalpy drop loss q in step S3, as follows:

[0072]

[0073] Where: A is the total surface area of the pipeline being tested, in m 2 ; G i is the flow value of each heat user 3; h s is the enthalpy of the heat source steam; h i is the enthalpy of steam of heat user 3; h w It is the saturated steam enthalpy corresponding to the average pressure of the heat source and heat user 3.

[0074] The monitoring and control terminal 8 obtains the heat source flow G through the thermal parameter monitoring system 7 s and the flow rate of each hot user G i , calculate the pipe loss G of the steam heating network gs :

[0075] G gs =G s -∑G i ,

[0076] Then calculate the condensation coefficient η of the steam heat network being measured:

[0077]

[0078] Threshold value η of steam heating network condensation coefficient min =MIN(η1,η2,…η N ).

[0079] S5. Primary regulation calculation of desuperheating water flow in steam heating network: by comparing η min and η to determine the cooling water sprayed by the water cooling device 9, the cooling water once adjusted amount G j , as follows:

[0080]

[0081] Where ΔG is the total condensation amount.

[0082] That is, when η ≥ η min When η<η, step S6 is performed to adjust the cooling water flow rate for the second time. min When , the adjustment process ends.

[0083] S6. Secondary regulation calculation of desuperheating water flow in steam heating network: Since the actual pipe loss of steam heating network will also change in the process of changing desuperheating water flow, the change value of the actual pipe loss of steam heating network is ΔG gs Considering the economic margin, the flow rate G of the primary cooling water is adjusted. j The economic coefficient m is multiplied by the calculated product and the change value ΔG of the actual pipe loss of the steam heating network is compared. gs The difference between them is used as the basis for the secondary regulation flow M of the desuperheating water in the steam heating network, as follows:

[0084] M=mG j -ΔG gs .

[0085] According to the pipe loss feedback during actual operation, when M takes the maximum value, the corresponding water spray cooling adjustment amount G j The most economical.

[0086] Example

[0087] This embodiment utilizes the regulating system of the present invention to achieve regulation of the cooling water flow rate, as follows:

[0088] like Figure 3 The figure shows a typical branched steam heating network applicable to this embodiment. The heat source point, superheat degree, and steam parameters of each heat user measured by the monitoring control terminal are shown in Table 1. The heat balance method is applied to the superheat section from s to e to obtain the enthalpy drop loss q in the superheat section. t for:

[0089]

[0090] According to the temperature of other nodes in the steam heating network measured by the monitoring and control terminal, the temperature correction coefficient ε of the steam heating network is obtained as follows:

[0091]

[0092] Then the average enthalpy drop loss q of the steam heating network is:

[0093] q=ε·q t =163.72W / m 2

[0094] Table 1 Steam parameter characteristics of typical dendritic heating network

[0095]

[0096]

[0097] According to the established quantitative relationship between heat dissipation loss and steam flow loss in the pipe, the steam condensation amount of the heat network is calculated as:

[0098]

[0099] The pipe loss G of the steam heating network can be obtained by monitoring the heat source point and the steam flow of the heat user through the monitoring control terminal. gs for:

[0100]

[0101] Therefore, the condensation coefficient η of the heating network is:

[0102]

[0103] Based on historical operating data, the steam heating network condensation coefficient under safe operating conditions is calculated, and the steam heating network condensation coefficient threshold η can be obtained. min .

[0104] η min =MIN(η1,η2,…η N )=20%

[0105] Comparison of the steam heating network condensation coefficient η under actual operation and the threshold η min , the cooling water primary adjustment amount G can be determined j .

[0106] G j =(η-η min )ΔG=2.22t / h

[0107] If the economic margin is 20%, the secondary adjustment amount M of the desuperheating water is:

[0108] M=mG j -ΔG gs =1.83t / h

[0109] By testing the heat loss of the dendritic heating network, it was found that the condensation coefficient of the heating network was 37.4%, which is higher than the threshold value of the condensation coefficient. The primary and secondary regulation amounts of the desuperheating water were 2.22t / h and 1.83t / h respectively.

[0110] While taking into account the operational risks and economic efficiency of the steam heating network, the present invention realizes secondary regulation of the desuperheating water volume. Through actual calculation, the obtained desuperheating water regulation volume can provide guidance for the operational regulation of the steam heating network. The implementation of the present invention can effectively improve the reliability and economy of the thermal system in actual operation, and has a wide range of application scenarios.

[0111] The embodiment described above is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Persons skilled in the art may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, any technical solution obtained by equivalent substitution or equivalent transformation falls within the scope of protection of the present invention.

Claims

1. A steam heating network operation regulation system based on condensation coefficient, characterized in that: It includes a steam heating network trunk line (1), a heat user branch line (2), an overheating test section (6), a thermal parameter monitoring system (7), a thermal parameter monitoring control terminal (8) and a water spray cooling device (9); The steam heat network trunk line (1) is connected to each heat user (3) through a plurality of heat user branches (2). An overheating section test starting point (4) and an overheating section test end point (5) are arranged on the steam heat network trunk line (1). The pipeline between the overheating section test starting point (4) and the overheating section test end point (5) is an overheating test section (6). A thermal parameter monitoring system (7) is arranged at the overheating section test starting point (4), the overheating section test end point (5), the heat user (3) and the external environment. The thermal parameter monitoring system (7) is used to obtain temperature, pressure and flow data. The data collected by the thermal parameter monitoring system (7) is finally transmitted and stored in the thermal parameter monitoring control terminal (8). A water spray cooling device (9) is provided at the front end of the steam heat network trunk line (1). The water spray cooling device (9) is connected to the thermal parameter monitoring control terminal (8) and is used to adjust the water flow according to the data collected by the thermal parameter monitoring control terminal (8).

2. The steam heating network operation regulation system based on condensation coefficient according to claim 1 is characterized in that: The pipe length of the superheat test section (6) is ≥700m or the steam temperature difference between the superheat test starting point (4) and the superheat test end point (5) is ≥3°C; the steam superheat at the superheat test end point (5) is ≥60°C, and the superheat test section (6) contains at least one of each type of pipe accessories provided on the steam heating network trunk line (1).

3. The steam heating network operation regulation system based on condensation coefficient according to claim 1 is characterized in that: The steam heat network trunk line (1) is a branch-shaped heat supply network with a single heat source or multiple heat sources.

4. A method for regulating the steam heating network operation regulation system based on the condensation coefficient according to any one of claims 1 to 3, characterized in that: The details are as follows: S1, judging whether the steam in the overheat test section (6) is overheated; if satisfied, proceed to steps S2 to S6; if not satisfied, end the adjustment process; S2, thermal parameter monitoring and control terminal (8) based on the steam temperature, steam pressure and flow rate G of the superheat section test starting point (4) s , the steam temperature and steam pressure at the superheating section test end point (5), and the structural dimensions of the superheating test section (6), the enthalpy drop loss q of the superheating test section (6) is obtained t ; S3, thermal parameter monitoring and control terminal (8) reads the heat source steam temperature t s , Superheat test section (6) steam temperature t e and steam temperature t of each heat user (3) i , calculate the steam heat network temperature correction coefficient ε, and then calculate the enthalpy drop loss q of the entire pipeline; S4. Based on the actual historical operation data of the steam heating network, the corresponding steam heating network condensation coefficient η is calculated, and the minimum value under safe operation conditions is the threshold value η of the steam heating network condensation coefficient min ; S5. By comparing η min and η to determine the primary adjustment amount G of the cooling water sprayed by the water cooling device (9) j , as follows: Where ΔG is the total condensation amount; When η≥η min When η<η, step S6 is performed to adjust the cooling water flow rate for the second time; min When , the adjustment process ends; S6. Considering the economic margin, adjust the flow rate G of the primary cooling water. j The economic coefficient m is multiplied by the calculated product and the change value ΔG of the actual pipe loss of the steam heating network is compared. gs The difference between them is used as the basis for the secondary regulation flow M of the desuperheating water in the steam heating network, as follows: M=mG j -ΔG gs 。 5. The adjustment method according to claim 4, characterized in that: The method for determining whether the steam is superheated in step S1 is as follows: Based on the steam thermodynamic parameter data measured by the thermodynamic parameter monitoring system (7) at the superheat section test starting point (4) and the superheat section test end point (5), it is determined whether the superheat section test end point (5) satisfies the steam superheat degree ≥ 60°C and whether the temperature difference between the superheat section test end point (5) and the superheat section test starting point (4) is ≥ 3°C.

6. The adjustment method according to claim 4, characterized in that: In step S2, the enthalpy drop loss q of the overheating test section (6) t The calculation formula is as follows: Where: h s and h e are the steam enthalpy values at the starting point (4) and the end point (5) of the superheat test section, respectively. The steam enthalpy values are calculated by the corresponding steam temperature and steam pressure; A t is the outer surface area of the insulation layer of the overheating test section (6).

7. The adjustment method according to claim 4, characterized in that: In the step S3, The calculation formula of steam heating network temperature correction coefficient ε is as follows: The calculation formula for the enthalpy drop loss q of the entire pipeline is as follows: q=εq t , Where, T a Indicates the external ambient temperature.

8. The adjustment method according to claim 4, characterized in that: In step S4, the condensation coefficient η of the steam heating network is defined as the actual pipe loss G of the steam heating network. gs The ratio of the total condensation volume ΔG to the total condensation volume ΔG is determined by the corrected enthalpy drop loss q in step S3, as follows: Where: A is the total surface area of the pipeline being tested, m 2 ; G i is the flow value of each heat user (3); h s is the enthalpy of the heat source steam; h i is the enthalpy of steam of heat user (3); h w is the saturated steam enthalpy corresponding to the mean of the pressures of the heat source and the heat user (3); The monitoring and control terminal (8) obtains the heat source flow G through the thermal parameter monitoring system (7) s and the flow rate of each hot user G i , calculate the pipe loss G of the steam heating network gs : G gs =G s -∑G i , Then calculate the condensation coefficient η of the steam heat network being measured: Threshold value η of steam heating network condensation coefficient min =MIN(η1,η2,…η N ).

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