Design method of fire hydrant system of high-fall pumped storage plant

Abstract

The invention provides a design method of a high-fall pumping and storage plant fire hydrant system. The design method comprises the following steps: S1, collecting a lower reservoir high water level H1, a lower reservoir dead water level H2, a highest fire hydrant elevation F1 and a lowest fire hydrant elevation F2 input by a user on an input interface for displaying information; s2, based on the basic parameters, a preferred fire hydrant system design form is recommended to a user through a software data algorithm, and the preferred fire hydrant system design form is one of a temporary high-pressure fire water supply system, a high-pressure and temporary high-pressure fire water supply system, a high-pressure fire water supply system and a high-pressure and reduced-pressure combined fire water supply system; and S3, on the basis of the fire hydrant system design form recommended in the step S2, critical setting parameter values are recommended to the user, and the critical setting parameter values mainly comprise the system switching critical water level H3, the fire pump lift H4, the pressure reducing valve water loss H5 and the critical pressure reducing elevation F3. The productivity is liberated, the working efficiency is improved, and the system design error probability is reduced.

Description

Technical Field

[0001] The present invention relates to a design method for a high-drop pumped storage plant fire hydrant system, which is suitable for the design of a pumped storage plant fire hydrant system that uses reservoir water as a fire water source, and realizes the determination of the design system form selection and critical design parameter feedback. Background Art

[0002] The hub of a pumped storage project is generally composed of a reservoir, a water diversion steel pipe, a power plant, a switch station and other parts. Because of the large water storage capacity of the lower reservoir, it can meet the water consumption requirements for fire fighting even under extreme dead water level conditions. Therefore, the lower reservoir is generally used as the preferred water source for fire water supply in the power plant.

[0003] The water level in the reservoir area is greatly affected by the season and grid scheduling, especially for daily regulation pumped storage power stations, which need to balance the grid voltage changes by adjusting the water volume between the upper and lower reservoirs, causing the water level in the reservoir area to fluctuate continuously between the normal water level and the dead water level.

[0004] Different from the fire hydrant system in civil buildings that uses fire water tanks as water supply sources, the water level fluctuation of such fire water tanks is generally only 3 to 5 meters, and the pressure of the inlet pipe is relatively stable, which has little impact on the pressure of the fire protection system. The water level fluctuation of the lower reservoir of the pumped storage project is generally 20 to 40 meters. In the design of the fire protection system scheme, it is necessary to ensure the minimum pressure requirement of the most unfavorable (highest point) fire hydrant under low water level conditions, and also to ensure that the fire hydrant at the lowest point will not be over-pressurized under high water level conditions. This is a problem that is easily overlooked in the design.

[0005] How to propose a method for selecting the system form and feedback on critical design parameters with wide coverage, simplicity and convenience for the pumped storage plant fire hydrant system that uses reservoir water as the fire water source is the main problem faced by the system design. Summary of the invention

[0006] The object of the present invention is to provide a design method for a high-drop pumped storage plant fire hydrant system to achieve automatic determination of system design form selection and pressure reduction critical parameter determination.

[0007] To this end, the above-mentioned purpose of the present invention is achieved through the following technical solutions:

[0008] S1, to display the information input interface, collect the lower reservoir high water level H1, lower reservoir dead water level H2, highest fire hydrant elevation F1, and lowest fire hydrant elevation F2 input by the user in the input interface.

[0009] S2. Based on the above basic parameters, the software data algorithm is used to recommend the preferred fire hydrant system design form to the user: temporary high-pressure fire water supply system, high-pressure + temporary high-pressure fire water supply system, high-pressure fire water supply system, and high-pressure + reduced-pressure combined fire water supply system. One of the four system forms is preferred.

[0010] S3. Based on the fire hydrant system design recommended in step S2, critical setting parameter values ​​are recommended to the user, mainly including the system switching critical water level H3, fire pump head H4, pressure reducing valve water loss H5, and critical pressure reducing elevation F3.

[0011] in:

[0012] H3 needs to be calculated only for high pressure + temporary high pressure fire water supply system and high pressure + reduced pressure combined fire water supply system.

[0013] H4 only needs to be calculated for temporary high-pressure fire water supply system or high-pressure + temporary high-pressure fire water supply system.

[0014] H5 needs to be calculated only when the fire water supply system is a combination of high pressure + reduced pressure.

[0015] While adopting the above technical solutions, the present invention may also adopt or combine the following technical solutions:

[0016] As a preferred technical solution of the present invention: in step S2, the system form selection is divided into three steps: the most unfavorable working condition analysis, the overpressure working condition analysis, and the second unfavorable working condition analysis;

[0017] The most unfavorable working condition analysis and judgment: judge by whether H2-F1 is ≥35m;

[0018] Analysis and judgment of overpressure condition: judge by whether H1-F2 is ≤100m;

[0019] Secondary adverse working condition analysis and judgment: judge by whether H1-F1 is ≥35m;

[0020] When H2-F1≥35m and H1-F2≤100m, the feedback result is: high pressure fire water supply system;

[0021] When H2-F1≥35m and H1-F2>100m, the feedback result is: high pressure + reduced pressure combined fire water supply system;

[0022] When H2-F1<35m and H1-F1≥35m, the feedback result is: high pressure + temporary high pressure fire water supply system;

[0023] When H2-F1<35m and H1-F1<35m, the feedback result is: temporary high-pressure fire water supply system.

[0024] As a preferred technical solution of the present invention: the feedback result is a high-pressure fire water supply system, and the parameter determination of the critical decompression elevation F3 is performed:

[0025] When H1-F2≤50m, the feedback result is " / ";

[0026] When H1-F2>50m, the feedback result of F3 is H1-50m.

[0027] As a preferred technical solution of the present invention: the feedback result is a temporary high-pressure fire water supply system, and the parameters of the pump head critical threshold H4 and the pressure reduction critical threshold F3 are determined: the pump head critical threshold H4 = F2 + 35 - H2 m;

[0028] When H1+H4-F2≤50m, the feedback result of F3 is “ / ”;

[0029] When H1+H4-F2>50m, the feedback result of F3 is H1+H4-50m.

[0030] As a preferred technical solution of the present invention: the feedback result is a high pressure + temporary high pressure fire water supply system, and the parameters of the system switching critical threshold H3, the pump head critical threshold H4, and the pressure reduction critical threshold F3 are determined: the system switching critical threshold H3 = F1 + 35m; the pump head critical threshold H4 = F1 + 35-H2 m;

[0031] When H3+H4-F2≤50m, the feedback result of F3 is “ / ”;

[0032] When H3+H4-F2>50m, the feedback result of F3 is H3+H4-50m.

[0033] As a preferred technical solution of the present invention: the feedback result is a high-pressure + reduced-pressure combined fire water supply system, and the parameters of the system switching critical threshold H3, the pressure reducing valve critical threshold H5, and the pressure reducing critical threshold F3 are determined: the system switching critical threshold H3 = the larger value of F2 + 100m and 35 + 5 + F1m; the pressure reducing valve critical threshold H5 = H3-F1-35m;

[0034] When H1-H5-F2≤50m and H3-F2≤50m, the feedback result of F3 is “ / ”;

[0035] When H1-H5-F2>50m or H3-F2>50m, the F3 feedback result is the larger value of H1-H5-50m and H3-50m.

[0036] The present invention provides a design method for a high-drop pumped storage plant fire hydrant system, which realizes automatic selection of fire hydrant system design, and realizes automatic verification of the lowest working pressure of the highest fire hydrant, the highest working pressure of the lowest fire hydrant and the fire hydrants that need to take pressure reduction measures as stipulated in the current specifications, which effectively solves the risk of not being able to fully consider the safety of the system due to the uneven design levels of different designers at this stage, and uses computers instead of manual work to realize system selection calculations, liberates productivity, improves work efficiency, and reduces the probability of errors in system design. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is a diagram of the information entry interface.

[0038] Figure 2 This is an overall logic diagram of the design method of the high-drop pumped storage plant fire hydrant system provided by the present invention.

[0039] Figure 3 Select a logical diagram for your system.

[0040] Figure 4 Feedback logic diagram for critical design parameters.

[0041] Figure 5 This is a typical high-pressure fire water supply system schematic.

[0042] Figure 6 This is a typical schematic diagram of a temporary high-pressure water supply system.

[0043] Figure 7 It is a typical high pressure + temporary high pressure fire water supply system.

[0044] Figure 8 It is a typical high pressure + reduced pressure combined fire water supply system.

[0045] In the figure: 1. Basic project information input column (used to collect basic project information); 2. Lower reservoir high water level H1 input column; 3. Lower reservoir dead water level H2 input column; 4. Highest fire hydrant elevation F1 input column; 5. Lowest fire hydrant elevation F2 input column; 6. Information feedback column (feedback system form and critical parameters according to this algorithm); 7. System form feedback column (temporary high-pressure fire water supply system, high-pressure + temporary high-pressure fire water supply system, high-pressure fire water supply system, high-pressure + pressure reduction combined fire water supply system four system forms, one is preferred); 8. Critical water level H3 feedback column; 9. Fire pump head H4 feedback column; 10. Pressure reducing valve water loss H5 feedback column; 11. Critical pressure reducing valve elevation F3 feedback column. DETAILED DESCRIPTION

[0046] like Figures 1 to 8As shown, a design method for a high-drop pumped storage plant fire hydrant system has a basic project information input column 1. The user inputs the lower reservoir high water level H1, the lower reservoir dead water level H2, the highest fire hydrant elevation F1, and the lowest fire hydrant elevation F2 in this interface, and the system makes a judgment.

[0047] 1. System form determination

[0048] Step 1.1: Worst case analysis

[0049] The system performs the most unfavorable fire hydrant pressure analysis based on the dead water level H2 of the lower reservoir and the highest fire hydrant elevation F1:

[0050] If H2-F1≥35m, it is determined that the most unfavorable fire hydrant use requirements can be met when the reservoir area is at low water level, and a high-pressure water supply system can be used, and step 1.2-1 can be entered;

[0051] If H2-F1<35m, it is determined that the reservoir area cannot meet the most unfavorable fire hydrant use requirements when the water level is low, and a water pump is needed to increase the pressure and go to step 1.2-2.

[0052] Step 1.2-1: Overpressure condition analysis

[0053] The system analyzes the lowest fire hydrant pressure based on the lower reservoir high water level H1 and the lowest fire hydrant elevation F2:

[0054] If H1-F2≤100m, it is determined that there is no overpressure under any operating condition of the system, and the feedback recommendation system form is a high-pressure fire water supply system;

[0055] If H1-F2>100m, it is determined that some fire hydrants are over-pressured when the water level in the reservoir is high, and the feedback recommendation system is a high-pressure + low-pressure combined fire water supply system.

[0056] Step 1.2-2: Analysis of sub-adverse conditions

[0057] The system performs the most unfavorable fire hydrant pressure analysis based on the high water level H1 of the lower reservoir and the highest fire hydrant elevation F1:

[0058] If H1-F1≥35m, it is determined that the system can meet the gravity water supply conditions when the water level is high, and the feedback recommendation system form is high pressure + temporary high pressure fire water supply system;

[0059] If H1-F1 is less than 35m, it is determined that the system gravity water supply requirements cannot be met under any water level condition in the reservoir area, and the feedback recommendation system form is a temporary high-pressure fire water supply system.

[0060] The above content is fed back to the system form feedback column 7.

[0061] (II) Critical parameter determination

[0062] According to the feedback judgment result of step (a), the critical parameters of the system are judged.

[0063] 2.1 High-pressure fire water supply system:

[0064] Step 2.1.1: Determine the necessity of decompression

[0065] The system analyzes the lowest fire hydrant pressure based on the lower reservoir high water level H1 and the lowest fire hydrant elevation F2:

[0066] If H1-F2≤50m, the system is judged to not need to reduce pressure, and feedback “ / ” is given to the critical pressure reducing valve elevation feedback column 11.

[0067] If H1-F2>50m, the system is judged to need decompression and proceed to step 2.1.2.

[0068] Step 2.1.2: Calculation of the critical decompression threshold F3

[0069] The system calculates the pressure relief critical threshold F3 according to the high water level H1 of the lower reservoir, F3 = H1-50 m, and feeds back the calculation result of F3 to the critical pressure relief valve elevation feedback column 11.

[0070] 2.2 Temporary high pressure fire water supply system:

[0071] Step 2.2.1: Calculation of critical threshold H4 of pump head

[0072] The system calculates the critical threshold H4 of the pump head according to the dead water level H2 of the lower reservoir and the elevation F2 of the lowest fire hydrant, H4=F2+35-H2, feeds back the calculation result of H4 to the fire pump head feedback column 9, and enters step 2.2.2.

[0073] Step 2.2.2: Determine the necessity of decompression

[0074] The system determines the necessity of decompression based on the high water level H1 of the lower reservoir, the elevation F2 of the lowest fire hydrant, and the calculation result H4 of step 2.2.1:

[0075] If H1+H4-F2≤50m, the system determines that decompression is not required and feedbacks “ / ” to the critical decompression valve elevation feedback column 11;

[0076] If H1+H4-F2>50m, the system determines that decompression is necessary and proceeds to step 2.2.3.

[0077] Step 2.2.3: Calculation of the critical decompression threshold F3

[0078] The system calculates the pressure relief critical threshold F3 according to the high water level H1 of the lower reservoir and the calculation result H4 of step 2.2.1, F3=H1+H4-50m, and feeds back the calculation result of F3 to the critical pressure relief valve elevation feedback column 11.

[0079] 2.3 High pressure + temporary high pressure fire water supply system:

[0080] Step 2.3.1: Calculation of system switching critical threshold H3

[0081] The system calculates the system switching critical threshold H3 based on the highest fire hydrant elevation F1, H3=F1+35, and feeds back the H3 calculation result to the critical water level feedback column 8.

[0082] When the reservoir water level H> the system switching critical threshold H3, the system switches to the high-pressure water supply system, and further calculates the pressure reduction critical threshold F3 according to step 2.1.1;

[0083] When the reservoir water level H ≤ the system switching critical threshold H3, the system switches to a temporary high-pressure water supply system and enters step 2.3.2.

[0084] Step 2.3.2: Calculation of critical threshold H4 of pump head

[0085] The system calculates the critical threshold H4 of the pump head according to the dead water level H2 of the lower reservoir and the elevation F1 of the highest fire hydrant, H4=F1+35-H2, feeds back the calculation result of H4 to the fire pump head feedback column 9, and enters step 2.2.3.

[0086] Step 2.3.3: Determine the necessity of decompression

[0087] The system determines the necessity of decompression based on the calculation result of the critical water level H3 in step 2.3.1, the calculation result of the critical threshold value H4 of the pump head in step 2.3.2, and the lowest fire hydrant elevation F2:

[0088] If H3+H4-F2≤50m, the system determines that decompression is not required and feeds back “ / ” to the critical decompression valve elevation feedback column 11;

[0089] If H3+H4-F2>50m, the system determines that decompression is necessary and proceeds to step 2.3.4.

[0090] Step 2.3.4: Calculation of the critical decompression threshold F3

[0091] The system calculates the pressure reducing critical threshold F3 according to the calculation results of the critical water level H3 in step 2.3.1 and the calculation results of the pump head critical threshold H4 in step 2.3.2, F3=H3+H4-50m, and feeds back the calculation results of F3 to the critical pressure reducing valve elevation feedback column 11.

[0092] 2.4 High pressure + reduced pressure combined fire water supply system:

[0093] Step 2.4.1: Calculation of system switching critical threshold H3

[0094] The system calculates the critical threshold H3 for system switching based on the lowest fire hydrant elevation F12 and the lowest fire hydrant elevation F2: H3(1) = F2 + 100m, H3(2) = 35 + 5 + F1m (5m is the minimum inlet and outlet head difference of the pressure reducing valve). The larger value of H3(1) and H3(2) is taken and the H3 calculation result is fed back to the critical water level feedback column 8.

[0095] When the reservoir water level H> the system switching critical threshold H3, the system switches to the reduced pressure water supply system and enters step 2.4.2;

[0096] When the reservoir water level H ≤ the system switching critical threshold H3, the system switches to the high-pressure water supply system and enters step 2.4.3.

[0097] Step 2.4.2: Calculation of the critical threshold value H5 of the pressure reducing valve

[0098] The system calculates the pressure reducing valve critical threshold H5 according to the highest fire hydrant elevation F1 and the calculation result of the system switching critical threshold H3 in step 2.4.1, H5 = H3-F1-35, and feeds back the calculation result of H5 to the pressure reducing valve water loss feedback column 10, and enters step 2.4.2.1.

[0099] Step 2.4.2.1: Determine the necessity of decompression

[0100] The system determines the necessity of reducing pressure based on the calculation result of the pressure reducing valve critical threshold value H5 in step 2.4.2, the high water level H1 of the lower reservoir and the elevation F2 of the lowest fire hydrant:

[0101] If H1-H5-F2≤50m, proceed to step 2.4.3;

[0102] If H1-H5-F2>50m, the system determines that decompression is necessary and proceeds to step 2.4.2.2.

[0103] Step 2.4.2.2: Calculation of critical decompression threshold F3(1)

[0104] The system calculates the pressure relief critical threshold F3 based on the calculation result of the pressure relief valve critical threshold H5 in step 2.4.2 and the high water level H1 of the lower reservoir, F3(1)=H1-H5-50 m, and records this value.

[0105] Step 2.4.3: Determine the necessity of decompression

[0106] The system determines the necessity of decompression based on the calculation result of the system switching critical threshold H3 in step 2.4.1 and the lowest fire hydrant elevation F2:

[0107] If H3-F2≤50m, the system determines that decompression is not required and feedbacks “ / ” to the critical decompression valve elevation feedback column 11;

[0108] If H3-F2>50m, the system determines that decompression is necessary and proceeds to step 2.4.3.1.

[0109] Step 2.4.3.1: Calculation of critical decompression threshold F3(2)

[0110] The system calculates the decompression critical threshold F3 according to the calculation result of the system switching critical threshold H3 in step 2.4.1, F3(2)=H3-50 m, records this value as F3(2), and proceeds to step 2.4.4.

[0111] Step 2.4.4: Determination of the critical decompression threshold F3

[0112] The system takes the larger value of the decompression critical threshold F3(2) calculated in step 2.4.3.1 and the decompression critical threshold F3(1) calculated in step 2.4.2.2 and feeds it back to the critical decompression valve elevation feedback column 11.

[0113] After the above determination is completed, the results will be fed back to the system form feedback column 7, the critical water level H3 feedback column 8, the fire pump head H4 feedback column 9, the pressure reducing valve water loss H5 feedback column 10, and the critical pressure reducing valve elevation F3 feedback column 11.

[0114] Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Any changes, additions or substitutions made by ordinary technicians in this technical field within the scope of the present invention should fall within the protection scope of the present invention.

Claims

1. A design method for a high-drop pumped storage powerhouse fire hydrant system, characterized by: The method comprises the following steps: S1, to display the information input interface, collect the lower reservoir high water level H1, lower reservoir dead water level H2, highest fire hydrant elevation F1, and lowest fire hydrant elevation F2 input by the user in the input interface; S2. Based on the above basic parameters, the software data algorithm recommends the preferred fire hydrant system design form to the user: temporary high-pressure fire water supply system, high-pressure + temporary high-pressure fire water supply system, high-pressure fire water supply system, high-pressure + pressure reduction combined fire water supply system, and one of the four system forms is preferred; S3. Based on the fire hydrant system design recommended in step S2, critical setting parameter values ​​are recommended to the user, mainly including: system switching critical water level H3, fire pump head H4, pressure reducing valve water loss H5, and critical pressure reducing elevation F3.

2. The design method of a high-drop pumped storage powerhouse fire hydrant system according to claim 1 is characterized by: In step S2, the system form selection is divided into three steps: the most unfavorable working condition analysis, the overpressure working condition analysis, and the second most unfavorable working condition analysis; The most unfavorable working condition analysis and judgment: judge by whether H2-F1 is ≥35m; Analysis and judgment of overpressure condition: judge by whether H1-F2 is ≤100m; Secondary adverse working condition analysis and judgment: judge by whether H1-F1 is ≥35m; When H2-F1≥35m and H1-F2≤100m, the feedback result is: high pressure fire water supply system; When H2-F1≥35m and H1-F2>100m, the feedback result is: high pressure + reduced pressure combined fire water supply system; When H2-F1<35m and H1-F1≥35m, the feedback result is: high pressure + temporary high pressure fire water supply system; When H2-F1<35m and H1-F1<35m, the feedback result is: temporary high-pressure fire water supply system.

3. The design method of a high-drop pumped storage powerhouse fire hydrant system according to claim 1 or 2 is characterized in that: The feedback result is a high-pressure fire water supply system, and the parameter determination of the critical pressure reduction elevation F3 is performed: When H1-F2≤50m, the feedback result is " / "; When H1-F2>50m, the feedback result of F3 is H1-50m.

4. The design method of a high-drop pumped storage powerhouse fire hydrant system according to claim 1 or 2, characterized in that: The feedback result is a temporary high-pressure fire water supply system, and the parameters of the pump head critical threshold H4 and the pressure reduction critical threshold F3 are determined: the pump head critical threshold H4 = F2 + 35 - H2 m; When H1+H4-F2≤50m, the feedback result of F3 is " / "; When H1+H4-F2>50m, the feedback result of F3 is H1+H4-50m.

5. The design method of a high-drop pumped storage powerhouse fire hydrant system according to claim 1 or 2, characterized in that: The feedback result is a high pressure + temporary high pressure fire water supply system, and the parameters of the system switching critical threshold H3, the pump head critical threshold H4, and the pressure reduction critical threshold F3 are determined: the system switching critical threshold H3 = F1 + 35m; the pump head critical threshold H4 = F1 + 35-H2 m; When H3+H4-F2≤50m, the feedback result of F3 is " / "; When H3+H4-F2>50m, the feedback result of F3 is H3+H4-50m.

6. The design method of a high-drop pumped storage powerhouse fire hydrant system according to claim 1 or 2, characterized in that: The feedback result is a high-pressure + reduced-pressure combined fire water supply system, and the parameters of the system switching critical threshold H3, the pressure reducing valve critical threshold H5, and the pressure reducing critical threshold F3 are determined: the system switching critical threshold H3 = the larger value of F2 + 100m and 35 + 5 + F1m; the pressure reducing valve critical threshold H5 = H3-F1-35m; When H1-H5-F2≤50m and H3-F2≤50m, the F3 feedback result is " / "; When H1-H5-F2>50m or H3-F2>50m, the F3 feedback result is the larger value of H1-H5-50m and H3-50m.

Images