A steam heating pipe network heat storage energy-saving device and method with a load regulation function

Abstract

The present invention discloses a steam heating pipe network heat storage energy-saving device and method with a load regulation function, including a drain tank. The inlet of the drain tank is an open structure, and the inlet of the drain tank is connected to a steam pipe. The inlet of the drain tank communicates the inner cavity of the steam pipe and the inner cavity of the drain tank. A water outlet is provided on the bottom side wall of the drain tank, and the water outlet is connected to a water collecting tank. The water outlet is connected to the water collecting tank through a switching valve. In the present invention, the accumulated water at the lower part of the drain tank is discharged to the water collecting tank through the switching valve, and the hot water in the water collecting tank can be recovered by a transport vehicle or discharged centrally, avoiding the problems of resource waste and environmental pollution.

Description

Technical Field

[0001] The present invention belongs to the technical field of steam heating energy conservation, and particularly relates to a steam heating pipe network heat storage energy conservation device and method with a load regulation function. Background Art

[0002] The load of heat users in industrial steam heating often changes continuously with the adjustment of production volume. Especially for most users, the production capacity during the day and at night is different, resulting in a large change in the steam consumption load. This brings great pressure to the steam supply regulation of the heat source. At the same time, traditional heating pipe networks need to arrange drain points to discharge the condensed water generated in the pipe network outside the pipe, which not only wastes a large amount of energy but also causes serious pollution and safety hazards to the surrounding environment. Summary of the Invention

[0003] In order to solve the problems existing in the prior art, the present invention provides a steam heating pipe network heat storage energy conservation device and method with a load regulation function, which solves the problems that when the steam load of current users changes greatly, the requirements for steam supply regulation of the heat source are relatively high, and the drain points arranged in the heating pipe network directly output condensed water, wasting a large amount of energy and polluting the environment.

[0004] To achieve the above object, the present invention provides the following technical solution: A steam heating pipe network heat storage energy conservation device with a load regulation function, including a drain tank. The inlet of the drain tank is an open structure. The inlet of the drain tank is connected to the steam pipe. The inlet of the drain tank communicates with the inner cavity of the steam pipe and the inner cavity of the drain tank. An outlet is opened on the bottom side wall of the drain tank. The outlet is connected to a water collecting tank. The outlet is connected to the water collecting tank through a switching valve.

[0005] Further, the outlet of the drain tank is connected to a cooling pipe. The outlet of the cooling pipe is connected to a first drain pipe. The outlet of the first drain pipe is connected to the water collecting tank. The switching valve is arranged on the first drain pipe.

[0006] Further, the outlet of the cooling pipe is also connected to a second drain pipe. The outlet of the second drain pipe is connected to the water collecting tank. The switching valve is also arranged on the second drain pipe.

[0007] Further, the switching valve includes a thermostatic drain valve and a bypass valve. The thermostatic drain valve is arranged on the first drain pipe. The bypass valve is arranged on the second drain pipe.

[0008] Further, a condensate outlet is opened on the steam pipe. The condensate outlet is connected to the inlet of the drain tank. The condensate outlet is located at the bottom of the steam pipe.

[0009] Further, the straight channel is between the inlet of the drain tank and the condensate outlet of the water collecting tank.

[0010] Further, a drain port is provided on the bottom side wall of the water collecting tank, a drain pipe is connected to the drain port, and a valve is provided on the drain pipe.

[0011] Further, an air extraction pipe is connected to the top side wall of the water collecting tank, and a vacuum pump is provided on the air extraction pipe.

[0012] The present invention also provides a method for a steam heating pipe network heat storage energy-saving device with a load regulation function, including the following steps: the drain tank receives the condensate in the steam pipe cavity, and the temperature of the condensate is the saturation temperature of the steam pressure. When the steam load in the steam pipe cavity increases, the condensate stored in the drain tank flashes to generate secondary steam;

[0013] After opening the switch valve, the condensate in the drain tank is input into the water collecting tank, and the water in the water collecting tank is collected for recovery or centralized discharge operation.

[0014] Further, an air extraction pipe is connected to the top side wall of the water collecting tank, and a vacuum pump is provided on the air extraction pipe. The vacuum pump is turned on to output the non-condensable gas in the water collecting tank cavity.

[0015] Compared with the prior art, the present invention has at least the following beneficial effects:

[0016] The present invention provides a steam heating pipe network heat storage energy-saving device with a load regulation function. By connecting a drain tank to the steam pipe, the condensate in the steam pipe cavity can flow into the drain tank. The temperature of the condensate is the saturation temperature of the local steam pressure. When the user steam load increases, since the adjustment of the heat source is not timely, the steam pressure in the steam pipe network will decrease. At this time, the saturated water under high pressure in the drain tank will flash to generate secondary steam, and the secondary steam is input into the steam pipe network from the opening of the drain tank to make up for the decrease in the steam pressure in the steam pipe network, which is beneficial to stabilizing the steam pressure in the steam pipe network. The steam generated by the flashing of the condensate in the steam pipe network is beneficial to stabilizing the pressure in the pipe network and regulating the load, and at the same time can be used as a supplementary steam source to play an energy-saving role. Moreover, the accumulated water at the lower part of the drain tank is discharged into the water collecting tank through the switch valve, and the hot water in the water collecting tank can be recovered by a transport vehicle or discharged centrally, avoiding the problems of resource waste and environmental pollution.

[0017] Further, the cooling pipe connected to the outlet of the drain tank can output the condensate in the drain tank to the water collecting tank, ensuring that the condensate in the drain tank will not accumulate excessively. By a reasonable drainage volume, excessive water accumulation in the drain tank is avoided, and the occurrence of water hammer phenomenon is prevented.

[0018] Further, the second drain pipe is connected to the water collecting tank, which can increase the flow rate and rate of the condensate input from the drain tank into the water collecting tank, and improve the working efficiency.

[0019] Furthermore, the thermostatic steam trap on the first hydrophobic pipeline can discharge the condensate while preventing steam leakage, ensuring the discharge of the condensate and isolating the steam to avoid waste of resources.

[0020] Furthermore, the air extraction pipe and the vacuum pump connected to the top side wall of the water collection tank can discharge the non-condensable gas in the inner cavity of the water collection tank to ensure the saturated pressure of the hot water in the water collection tank.

[0021] The present invention also provides a method for a steam heating pipe network heat storage and energy saving device with a load regulation function. The condensate of the steam in the steam pipeline enters the drain tank, and the temperature of the condensate is the saturated temperature of the local steam pressure. When the steam load of the user suddenly increases, due to the untimely adjustment of the heat source, the steam pressure in the steam pipe network will decrease. The saturated water under high pressure in the drain tank will flash to generate secondary steam to make up for the untimely adjustment of the heat source and achieve an energy-saving effect. At the same time, too much hot water in the drain tank can be discharged into the water collection tank to avoid excessive water accumulation in the drain tank and prevent the occurrence of water hammer phenomenon. Description of the Drawings

[0022] Figure 1 is a schematic structural diagram of the present invention;

[0023] Figure 2 is a schematic structural diagram of another embodiment of the present invention;

[0024] In the drawings: 1 - steam pipeline, 2 - drain tank, 3 - cooling pipeline, 4 - bypass valve, 5 - thermostatic steam trap, 6 - water collection tank, 7 - air extraction pipe, 8 - vacuum pump, 9 - drainage pipeline, 10 - valve. Detailed Embodiments

[0025] The present invention will be further described below in conjunction with the drawings and specific embodiments.

[0026] As Figure 1 shown, the present invention provides a steam heating pipe network heat storage and energy saving device with a load regulation function, including a drain tank 2, a water collection tank 6 connected to the steam pipeline 1, and a cooling pipeline 3 located between the two. A switch valve is provided on the cooling pipeline 3.

[0027] In this embodiment, a condensate outlet is provided on the steam pipeline 1. The condensate outlet is connected to the inlet of the drain tank 2. The condensate outlet is located at the bottom of the steam pipeline 1. In this embodiment, the straight channel is between the inlet of the drain tank 2 and the condensate outlet of the water collection tank 6, and the inlet of the drain tank 2 is an open structure. The inlet of the drain tank 2 communicates with the inner cavity of the steam pipeline 1 and the inner cavity of the drain tank 2 to ensure the rate of the secondary steam input from the drain tank 2 into the steam pipeline 1;

[0028] Specifically, during the operation of the steam pipe network, the condensed water in the steam pipe 1 accumulates in the drain tank 2. When the steam load is small, the pressure drop generated by the steam is small, and the condensed water is at the saturation temperature under a relatively high steam pressure. When the steam load increases, due to the untimely adjustment of the heat supply heat source, the steam pressure in the steam pipe network will decrease. At this time, the drain water under a relatively high pressure will flash to generate secondary steam, making up for the decrease in the steam pressure in the steam pipe network, which is beneficial to stabilizing the steam pressure in the steam pipe network. The drain water in the steam pipe network generates secondary steam through flashing, which is beneficial to stabilizing the pressure in the steam pipe network, adjusting the load in the steam pipe 1, and at the same time acting as a supplementary steam source to play an energy-saving role.

[0029] In this embodiment, a water outlet is provided on the bottom side wall of the drain tank 2, and the water outlet is connected to a water collecting tank 6, and the water outlet is connected to the water collecting tank 6 through a switching valve. Specifically, the water outlet of the drain tank 2 is connected to a cooling pipe 3, the outlet of the cooling pipe 3 is connected to a first drain pipe, and the outlet of the first drain pipe is connected to the water collecting tank 6. The switching valve is arranged on the first drain pipe. In this embodiment, the outlet of the cooling pipe 3 is also connected to a second drain pipe, the outlet of the second drain pipe is connected to the water collecting tank 6, and the switching valve is also arranged on the second drain pipe. Preferably, the switching valves are a bypass valve 4 and a thermostatic drain valve 5 respectively. The first drain pipe is provided with a thermostatic drain valve 5. The characteristic of the thermostatic drain valve 5 is that it can discharge when the temperature of the hot water is lower than a certain saturation temperature, so that the high-temperature drain water can accumulate in the drain tank 2 for a certain period of time. The accumulated water at the lower part of the drain tank 2 will be discharged to the water collecting tank 6 through the thermostatic drain valve 5 after being cooled to a certain temperature in the cooling pipe 3. The hot water in the water collecting tank 6 can be recovered by a transport vehicle or discharged centrally. In this embodiment, when the accumulated water volume in the drain tank 2 is too large and the discharge needs to be increased, the bypass valve 4 is opened, so that the accumulated water in the drain tank 2 is respectively input into the water collecting tank 6 through the first drain pipe and the second drain pipe.

[0030] In this embodiment, a drain port is provided on the bottom side wall of the water collecting tank 6, and a drain pipe 9 is connected to the drain port. A valve 10 is arranged on the drain pipe 9. When it is necessary to collect the accumulated water in the water collecting tank 6, the valve 10 is opened to take the hot water in the water collecting tank 6.

[0031] As Figure 2 shown, in another embodiment of this embodiment, an air extraction pipe 7 is provided on the top side wall of the water collecting tank 6, and a vacuum pump 8 is arranged on the air extraction pipe 7. The vacuum pump 8 is started to extract the non-condensable gas in the water collecting tank 6, discharging the non-condensable gas precipitated when the condensed water condenses, so as to ensure the pressure in the water collecting tank 6, corresponding to the saturation pressure of the condensed water temperature.

[0032] In another embodiment of the present invention, a method for a steam heating pipe network heat storage energy-saving device with a load regulation function is also provided, including the following steps: The drain tank 2 receives the condensate in the inner cavity of the steam pipe 1, and the temperature of the condensate is the saturation temperature of the steam pressure. When the steam load in the inner cavity of the steam pipe 1 increases, the condensate stored in the drain tank 2 flashes to generate secondary steam;

[0033] After opening the switch valve, the condensate in the drain tank 2 is input into the collecting tank 6, and the moisture in the collecting tank 6 is collected for recycling or centralized discharge operations;

[0034] Open the vacuum pump 8 to output the non-condensable gas in the inner cavity of the collecting tank 6.

[0035] The energy-saving effect calculation of the present invention takes the operation of the medium-pressure steam pipe in the heating pipe network as an example. The common operating range of the medium-pressure steam pipe is generally between 2.1 MPa and 2.7 MPa. The saturated steam enthalpy value corresponding to 2.7 MPa (gauge pressure) is 2803.18 kJ / kg, and the saturated water enthalpy value is 999.66 kJ / kg; the saturated steam enthalpy value corresponding to 2.1 MPa (gauge pressure) is 2800.21 kJ / kg, and the saturated water enthalpy value is 931.12 kJ / kg.

[0036] The calculation formula for the secondary steam generated by the sudden reduction in pressure causing the saturation water to flash:

[0037]

[0038] In the formula:

[0039] β: The generation ratio of secondary steam (flash steam), kg (flash steam) / kg (condensate).

[0040] h f : Liquid enthalpy, kJ / kg.

[0041] h fg : Evaporation enthalpy or latent heat of evaporation, kJ / kg. h fg =h g -h f hg is the saturated steam enthalpy

[0042] P 1 : High pressure

[0043] P 2 : Low pressure

[0044] Therefore, the secondary steam generation amount in the above example is 0.034 kg (steam) / kg (condensate)

[0045] Energy-saving ratio:

[0046]

[0047] γ: The energy loss reduced by this invention compared with the traditional direct hydrophobic method.

[0048] In the above example, the energy-saving ratio is 6.8%, that is, compared with the traditional hydrophobic method, this invention can reduce 6.8% of the heat loss caused by hydrophobicity. If the hot water in the water collection tank 6 can be recycled, the energy-saving ratio will be higher than 10%.

[0049] To sum up, when this invention is used in the steam pipeline network, the steam condensate in the pipeline enters the drainage tank, and the temperature of the condensate is the saturation temperature of the local steam pressure. When the steam load of the user suddenly increases, the steam pressure in the pipeline network will decrease due to the untimely adjustment of the heat source. The saturated water under high pressure in the drainage tank will flash to generate secondary steam to make up for the untimely adjustment of the heat source and achieve the effect of energy saving. The bypass valve at the bottom of the drainage tank is normally in a normally closed state, and the thermostatic steam trap can accumulate the condensate in the drainage tank. At the same time, by reasonably setting the drainage temperature, it is possible to avoid excessive water accumulation in the drainage tank and prevent the occurrence of water hammer phenomenon.

[0050] Finally, it should be noted that the above-described embodiments are only specific embodiments of the present invention, used to illustrate the technical solutions of the present invention, rather than limiting it. The protection scope of the present invention is not limited thereto. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that any person skilled in the art within the technical scope disclosed by the present invention can still modify the technical solutions described in the foregoing embodiments or easily think of changes, or perform equivalent replacements on some of the technical features; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope defined by the claims.

Claims

1. A method for a heat storage and energy-saving device of a steam heating pipe network with a load regulation function, Characterized in that, It includes a drain tank (2), the inlet of the drain tank (2) is an open structure, the inlet of the drain tank (2) is connected to the steam pipe (1), the inlet of the drain tank (2) communicates with the inner cavity of the steam pipe (1) and the inner cavity of the drain tank (2), a water outlet is provided on the bottom side wall of the drain tank (2), and the water outlet is connected to a water collecting tank (6), and the water outlet is connected to the water collecting tank (6) through a switching valve; The water outlet of the drain tank (2) is connected to a cooling pipe (3), the outlet of the cooling pipe (3) is connected to a first drain pipe, and the outlet of the first drain pipe is connected to the water collecting tank (6), and the switching valve is arranged on the first drain pipe; The outlet of the cooling pipe (3) is also connected to a second drain pipe, the outlet of the second drain pipe is connected to the water collecting tank (6), and the switching valve is also arranged on the second drain pipe; The drain tank (2) receives the condensed water in the inner cavity of the steam pipe (1), and the temperature of the condensed water is the saturation temperature of the steam pressure. When the steam load in the inner cavity of the steam pipe (1) increases, the condensed water stored in the drain tank (2) flashes to generate secondary steam; After opening the switching valve, the condensed water in the drain tank (2) is input into the water collecting tank (6), and the water in the water collecting tank (6) is collected for recycling or centralized discharge operation.

2. The method for a heat storage and energy-saving device of a steam heating pipe network with a load regulation function according to claim 1, Characterized in that, The switching valve includes a thermostatic drain valve (5) and a bypass valve (4), the thermostatic drain valve (5) is arranged on the first drain pipe, and the bypass valve (4) is arranged on the second drain pipe.

3. The method for a heat storage and energy-saving device of a steam heating pipe network with a load regulation function according to claim 1, Characterized in that, A condensed water outlet is provided on the steam pipe (1), the condensed water outlet is connected to the inlet of the drain tank (2), and the condensed water outlet is located at the bottom of the steam pipe (1).

4. The method for a heat storage and energy-saving device of a steam heating pipe network with a load regulation function according to claim 3, Characterized in that, A straight channel is provided between the inlet of the drain tank (2) and the condensed water outlet of the water collecting tank (6).

5. The method for a heat storage and energy-saving device of a steam heating pipe network with a load regulation function according to claim 1, Characterized in that, A drain port is provided on the bottom side wall of the water collecting tank (6), a drain pipe (9) is connected to the drain port, and a valve (10) is arranged on the drain pipe (9).

6. The method for a heat storage and energy-saving device of a steam heating pipe network with a load regulation function according to claim 1, Characterized in that, An air extraction pipe (7) is connected to the top side wall of the water collecting tank (6), and a vacuum pump (8) is arranged on the air extraction pipe (7).

7. The method for a heat storage and energy-saving device of a steam heating pipe network with a load regulation function according to claim 1, Characterized in that: An air extraction pipe (7) is connected to the top side wall of the water collecting tank (6), and a vacuum pump (8) is provided on the air extraction pipe (7). When the vacuum pump (8) is turned on, the non-condensable gas in the inner cavity of the water collecting tank (6) is output.

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