Verification method for industrial gas pipeline spray cooling device arrangement

Abstract

The invention provides a verification method for arrangement of an industrial gas pipeline spraying cooling device. The verification method comprises the following steps that VLA air pipe parameters are obtained, booster water pump parameters are obtained, nozzles are selected, the nozzles are installed at intervals according to the spraying diameters of the nozzles, and the spraying ranges of the nozzles can be connected; calculating whether the nozzle at the most unfavorable point meets the normal working pressure requirement or not; judging whether the cooling temperature conserved by heat exchange accords with an estimated range or not; the lowest total water pressure required by the total faucet can be obtained through the lowest water pressure of the normal work of the spray head, and then the lowest total water pressure is compared with the supplied water pressure to verify whether the water pressure meets the expectation or not; according to the method, the actual cooling degree effect can be obtained through system cooling calculation, and the actual cooling degree effect is compared with expected cooling for verification; meanwhile, actual use data can be estimated in advance; according to the method, the reliability can be quickly verified by continuously improving the data of each factor.

Description

Technical Field

[0001] The invention relates to the technical field of spray arrangement, and in particular to a method for verifying the arrangement of a spray cooling device for an industrial gas pipeline. Background Art

[0002] In summer, due to the influence of ambient temperature, the temperature of objects outdoors is relatively high. The VLA carbon steel duct used in industrial gas pipelines will continue to absorb the temperature of light and ambient temperature in the external environment, which may cause the surface temperature of the VLA carbon steel duct to exceed 70 degrees. Due to the large amount of VLA gas in the duct, the temperature in the duct will generally reach 55 degrees under the conditions of thermal radiation and convection. The cooling capacity of the public circulating water used by the carbon bed VLA cooling system has also reached full load in the hot summer. The high-temperature VLA gas enters the carbon bed, which has the safety risk of causing the activated carbon to accumulate heat and catch fire at high temperatures.

[0003] Combined with the existing working conditions, the solution is to add a spray cooling facility above the VLA gas duct to cool the VLA gas. In the spray arrangement, the spray has a diameter range. The spray brought by the spray can increase the humidity around the pipeline, thereby reducing the temperature of the pipeline. However, in the factory environmental protection requirements, it is necessary to ensure that there is no water accumulation on the ground around the pipeline. At the same time, it is necessary to ensure the cooling amount of the pipeline by the spray, and the pipeline must be reasonably laid according to the length of the spray laying. In actual laying, the rationality of the laying cannot be estimated in advance, which is easy to cause unreasonable rework of the laying, and increase the difficulty and progress of the laying. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a method for verifying the arrangement of an industrial gas pipeline spray cooling device to solve the problem of the rationality of the pipeline spray cooling arrangement.

[0005] Based on the technical problems existing in the background technology, the present invention proposes a method for verifying the layout of an industrial gas pipeline spray cooling device, comprising the following steps:

[0006] S1: Get the VLA air duct parameters, get the booster pump parameters, select the nozzles, and install the nozzles according to the nozzle spray diameter intervals so that the spray range of the nozzles can be connected;

[0007] S2: Calculate whether the nozzle at the most unfavorable point meets the normal working pressure requirement;

[0008] S3: Whether the cooling temperature is within the estimated range according to the law of heat exchange conservation.

[0009] Preferably, step S2 comprises the following steps:

[0010] S21: Obtain the total water pressure value and record it as h.

[0011] S22: Obtain the minimum water pressure requirement for the faucet with the lowest water pressure to work normally, and record it as h0;

[0012] S23: Obtain the water pressure loss between the tap with the lowest water pressure and the total pressure head, and record it as h f ;

[0013] S24: Obtain the local water pressure loss of the tap with the lowest water pressure and record it as h j ;

[0014] S25: by h=h0+h f +h j Get h, take h0 = 2bar;

[0015] Preferably, step S23 calculates h f Follow these steps:

[0016] S231: Obtain the pipeline length and record it as L (m);

[0017] S232: Obtain the average flow velocity of the water flow in the pipeline and record it as V (m / s);

[0018] S233: Obtain the hydraulic radius and record it as R (m);

[0019] S234: Obtaining Xiecai coefficient C—Xiecai coefficient;

[0020] S235: Obtain the pipeline roughness coefficient and record it as n;

[0021] S236: Through the Xie Cai-Manning formula h f =LV 2 / C 2 R is calculated to get h f .

[0022] Preferably, step S24 calculates h j Follow these steps:

[0023] S241: By formula h j =hf×15% to get h j .

[0024] Preferably, step S3 comprises the following steps:

[0025] S31: Obtain the density of the VLA gas in the duct and record it as ρ VLA ;

[0026] S32: Get the VLA gas volume flow rate in the air duct and record it as V VLA ;

[0027] S33: Obtain the specific heat of the VLA gas in the duct and record it as Cp VLA ;

[0028] S34: enthalpy of evaporation of water at room temperature 30 degrees ΔH;

[0029] S35: Take the flow rate M of the sprinkler water 水 ;

[0030] S36: Through the heat conservation formula ρ VLA V VLA Cp VLA Δt=ΔHM 水 × heat exchange efficiency × duct wetting rate, the calculated value of the gas temperature drop in the outlet duct Δt;

[0031] S37: Compare Δt with the estimated value.

[0032] Compared with the prior art, the verification method for the arrangement of the industrial gas pipeline spray cooling device proposed by the present invention adopts the above technical solution and achieves the following technical effects:

[0033] The present invention can obtain the minimum total water pressure required by the total faucet through the minimum water pressure for normal operation of the shower head, and then compare the minimum total water pressure with the supplied water pressure to verify whether it meets expectations; the method can obtain the actual cooling numerical effect through system cooling calculation and compare and verify the expected cooling; at the same time, the actual usage data can be estimated in advance.

[0034] In this application, reliability can be quickly verified by continuously improving the data of each factor. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is a simplified diagram of the air duct installation distribution of the present invention. DETAILED DESCRIPTION

[0036] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0038] Example

[0039] Please refer to Figure 1 The present invention proposes a method for verifying the arrangement of an industrial gas pipeline spray cooling device, comprising the following steps:

[0040] S1: Get the VLA duct parameters. The outer diameter of the duct is 2700 mm. The length of the duct is 50 meters and 60 meters. The two ducts are installed in a vertical arrangement. Get the booster pump parameters. The output pressure of the booster pump is 4 bar and the output water flow is 15m 3 / h, the nozzles used are those with a working pressure of 2 bar and a spraying diameter of 1 meter. According to the spraying diameter of the nozzles, the radius is 0.5 meters, so the maximum spacing between the two nozzles is 1 meter. In this application, the nozzles are installed 1 meter apart and 0.5 meters away from the surface of the air duct. The number is 100.

[0041] S2: Calculate whether the most unfavorable point sprinkler meets the normal working pressure requirement. The most unfavorable point sprinkler is the sprinkler with the lowest pressure. The closer the sprinkler is to the water source, the higher its pressure will be. Its pressure can make the sprinkler reach a spray with a diameter of 1 meter. The farther away from the water source, the smaller the sprinkler pressure will be. It is defined as the most unfavorable point sprinkler. When the most unfavorable point sprinkler meets its working pressure, it means that the pressure of each sprinkler can work normally.

[0042] S3: Based on whether the outlet cooling temperature meets the estimated range according to the heat exchange conservation, the heat conservation is used to calculate whether the temperature reduction of the outlet air duct meets the expected value, and a comparison is performed.

[0043] In a specific embodiment, refer to Figure 1 , step S2 comprises the following steps:

[0044] S21: Obtain the total water pressure value and record it as h, where the pressure of the water source is 4 bar. The calculated h is the minimum water pressure requirement. If h is less than 4 bar, it means that the pressure of the arranged sprinkler device meets the requirements. Calculate the h value and check that it does not exceed 28m.

[0045] S22: Obtain the minimum water pressure requirement for the normal operation of the faucet with the lowest water pressure, and record it as h0; take the working water head of 20m under the nozzle wetting diameter of 1m;

[0046] S23: Obtain the water pressure loss between the tap with the lowest water pressure and the total pressure head, and record it as h f ;

[0047] S24: Obtain the local water pressure loss of the tap with the lowest water pressure and record it as h j ;

[0048] S25: by h=h0+h f +h j Get h, take h0 = 2bar; under the condition that the nozzle working pressure h0 is 2bar, according to h = h0 + h f +h j The calculation requires a total water head of 23.51 meters, while the actual total water head is 28 meters, which meets the usage requirements.

[0049] In a specific embodiment, refer to Figure 1 Step S23 calculates h f Follow these steps:

[0050] S231: Obtain the length of the pipeline and record it as L (m); in this example, L is the distance from the farthest end of the parallel pipeline to the inlet, which is 60m;

[0051] S232: Obtain the average flow velocity of the water flow in the pipeline and record it as V (m / s); all nozzles are calculated based on the water flow rate of 50L / h when the free water head of the nozzle at the most unfavorable point is 2bar;

[0052] S233: Obtain the hydraulic radius and record it as R (m); take R = d / 4;

[0053] S234: Obtaining the Xiecai coefficient C—Xiecai coefficient; R 1 / 6 / n;

[0054] S235: Obtain the pipeline roughness coefficient and record it as n; for stainless steel pipe n = 0.015;

[0055] S236: Through the Xie Cai-Manning formula h f =LV 2 / C 2 R is calculated to get h f ; Finally, h is calculated f is 3.06m, the local head loss is 15% of the loss along the way, h j =h f ×15%=0.45m.

[0056] In a specific embodiment, refer to Figure 1Step S24 calculates h j Follow these steps:

[0057] S241: By formula h j =hf×15% to get h j .

[0058] In a specific embodiment, refer to Figure 1 , step S3 comprises the following steps:

[0059] S31: Obtain the density of the VLA gas in the duct and record it as ρ VLA ; Since more than 98% of VLA gas is air, ρ VLA Use ρ 空气 Instead, it is 1.293kg / m 3 ;

[0060] S32: Get the VLA gas volume flow rate in the air duct and record it as V VLA ; The flow rate in this application is 210000m 3 / h;

[0061] S33: Obtain the specific heat of the VLA gas in the duct and record it as Cp VLA ; The gas temperature in the air duct is usually up to 55 degrees. In this application, the density of VLA gas is close to that of air, so the specific heat of air is used instead. The specific heat of air at 55°C is 1.005 kJ / (kg·°C)

[0062] S34: Take the evaporation enthalpy of water at room temperature 30 degrees ΔH; it is found that ΔH = 2423.7 kJ / kg;

[0063] S35: Take the flow rate M of the sprinkler water 水 ; The water spraying capacity of the nozzle is designed to be 5t / h;

[0064] S36: Through the heat conservation formula ρ VLA V VLA Cp VLA Δt=ΔHM 水 × heat transfer efficiency × duct wetting rate, the calculated gas temperature drop Δt in the outlet duct; the heat transfer efficiency of a single duct pass shell and tube heat exchanger is 20%, and the spray water can generally only wet 50% of the duct surface, that is, the upper half of the duct. The VLA gas temperature drop Δt in the duct is calculated to be 4.45℃;

[0065] S37: Comparing Δt with the estimated value of 4.4 degrees, it is consistent with the actual temperature drop forecast.

[0066] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A method for verifying the layout of an industrial gas pipeline spray cooling device, characterized in that: The following steps are involved: S1: Get the VLA air duct parameters, get the booster pump parameters, select the nozzles, and install the nozzles according to the nozzle spray diameter intervals so that the spray range of the nozzles can be connected; S2: Calculate whether the nozzle at the most unfavorable point meets the normal working pressure requirement; S3: Whether the cooling temperature is within the estimated range according to the law of heat exchange conservation.

2. The verification method for the arrangement of the industrial gas pipeline spray cooling device according to claim 1 is characterized in that: Step S2 includes the following steps: S21: Obtain the total water pressure value and record it as h. S22: Obtain the minimum water pressure requirement for the faucet with the lowest water pressure to work normally, and record it as h0; S23: Obtain the water pressure loss between the tap with the lowest water pressure and the total pressure head, and record it as h f ; S24: Obtain the local water pressure loss of the tap with the lowest water pressure and record it as h j ; S25: by h=h0+h f +h j Obtain h and take h0=2bar.

3. The verification method for the arrangement of the industrial gas pipeline spray cooling device according to claim 2 is characterized in that: Step S23 calculates h f Follow these steps: S231: Obtain the pipeline length and record it as L (m); S232: Obtain the average flow velocity of the water flow in the pipeline and record it as V (m / s); S233: Obtain the hydraulic radius and record it as R (m); S234: Obtaining Xiecai coefficient C—Xiecai coefficient; S235: Obtain the pipeline roughness coefficient and record it as n; S236: Through the Xie Cai-Manning formula h f =LV 2 / C 2 R is calculated to get h f .

4. The method for verifying the arrangement of the industrial gas pipeline spray cooling device according to claim 2 is characterized in that: Step S24 calculates h j Follow these steps: S241: By formula h j =hf×15% to get h j .

5. The method for verifying the arrangement of the industrial gas pipeline spray cooling device according to claim 1 is characterized in that: Step S3 includes the following steps: S31: Obtain the density of the VLA gas in the duct and record it as ρ VLA ; S32: Get the VLA gas volume flow rate in the air duct and record it as V VLA ; S33: Obtain the specific heat of the VLA gas in the duct and record it as Cp VLA ; S34: enthalpy of evaporation of water at room temperature 30 degrees ΔH; S35: Take the flow rate M of the sprinkler water 水 ; S36: Through the heat conservation formula ρ VLA V VLA Cp VLA Δt=ΔHM 水 × heat exchange efficiency × duct wetting rate, the calculated value of the gas temperature drop in the outlet duct Δt; S37: Compare Δt with the estimated value.

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