White white elimination system

Abstract

The white elimination system comprises a heat exchange assembly, a flash tank and a first temperature measuring device, the heat exchange assembly is provided with a heat release side pipeline and a heat absorption side pipeline, an inlet of the heat release side pipeline is used for allowing pressurized drain water to enter, and an inlet of the heat absorption side pipeline is used for allowing cooling water to enter; an inlet of the flash tank is communicated with an outlet of the heat release side pipeline, and the first temperature measuring equipment is arranged between the outlet of the heat release side pipeline and the inlet of the flash tank so as to measure the temperature of pressure drain water entering the flash tank. According to the white elimination system, heat exchange is carried out on the pressure drain water entering the flash tank through the heat exchange assembly, part of heat of the pressure drain water is recycled, the temperature of the pressure drain water is reduced, the temperature of the pressure drain water is reduced to the saturation temperature corresponding to the local atmospheric pressure, and therefore no steam is generated when the flash tank works.

Description

Technical Field

[0001] The present invention relates to the technical field of de - whitening, and particularly relates to a de - whitening system. Background Art

[0002] The regular blowdown of the steam boiler enters the regular blowdown flash tank, and the condensate water generated by steam users enters the drain flash tank. The flash tanks are directly emptied. The above - mentioned blowdown and condensate water are all high - temperature water under pressure. The pressure is released in the flash tank and becomes steam and saturated water. The saturated water is taken away by a pipeline, and the steam discharged into the atmosphere will generate white fog. The white fog not only has an adverse impact on the surrounding environment and ecology, but also wastes heat and water volume. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems in the related art to some extent.

[0004] For this purpose, an embodiment of the present invention provides a de - whitening system, which exchanges heat for the pressurized drain water entering the flash tank, recovers part of the heat of the pressurized drain water, reduces the temperature of the pressurized drain water, and reduces the temperature of the pressurized drain water to the saturation temperature corresponding to the local atmospheric pressure, so that no steam is generated during the operation of the flash tank.

[0005] The de - whitening system according to an embodiment of the present invention includes a heat - exchange component, a flash tank, and a first temperature - measuring device. The heat - exchange component has a heat - releasing side pipeline and a heat - absorbing side pipeline. The inlet of the heat - releasing side pipeline is for the pressurized drain water to enter, the inlet of the heat - absorbing side pipeline is for cooling water to enter, the inlet of the flash tank is communicated with the outlet of the heat - releasing side pipeline, and the first temperature - measuring device is arranged between the outlet of the heat - releasing side pipeline and the inlet of the flash tank to measure the temperature of the pressurized drain water entering the flash tank.

[0006] The de - whitening system according to an embodiment of the present invention exchanges heat for the pressurized drain water entering the flash tank through the heat - exchange component, recovers part of the heat of the pressurized drain water, reduces the temperature of the pressurized drain water, and reduces the temperature of the pressurized drain water to the saturation temperature corresponding to the local atmospheric pressure, so that no steam is generated during the operation of the flash tank.

[0007] In some embodiments, the heat - exchange component includes a first heat exchanger and a regulating valve. The first heat exchanger has a first heat - releasing side and a first heat - absorbing side. The inlet of the first heat - releasing side is for the pressurized drain water to enter, the outlet of the first heat - releasing side forms the outlet of the heat - releasing side pipeline, the inlet of the regulating valve is for cooling water to enter, and the outlet of the regulating valve is communicated with the inlet of the first heat - absorbing side.

[0008] In some embodiments, the heat exchange assembly further includes a second heat exchanger having a second heat release side and a second heat absorption side. The inlet of the second heat release side forms the inlet of the heat release side pipeline, and the outlet of the second heat release side is communicated with the inlet of the first heat release side. The inlet of the second heat absorption side is for cooling water to enter.

[0009] In some embodiments, the de - white system further includes a second temperature measuring device disposed between the outlet of the second heat release side and the inlet of the first heat release side.

[0010] In some embodiments, the de - white system further includes a controller connected to the first temperature measuring device, the second temperature measuring device, and the regulating valve.

[0011] In some embodiments, the inlet of the second heat absorption side is provided with a water inlet pipe for cooling water to enter. The de - white system further includes a bypass pipe and a bypass valve. The bypass pipe is disposed on the water inlet pipe, and the bypass valve is disposed on the bypass pipe.

[0012] In some embodiments, the cooling water entering the second heat absorption side is the water to be heated in the water - using system.

[0013] In some embodiments, both the first heat exchanger and the second heat exchanger are water - to - water heat exchangers.

[0014] In some embodiments, the cooling water entering the first heat absorption side is the cooling water in the circulating cooling system. Brief Description of the Drawings

[0015] Figure 1 is a schematic diagram of the de - white system according to an embodiment of the present invention;

[0016] Figure 2 is a schematic diagram of the de - white system according to another embodiment of the present invention.

[0017] Reference Signs:

[0018] De - white system 100, heat exchange assembly 1, first heat exchanger 11, regulating valve 12, second heat exchanger 13, expansion vessel 2, first temperature measuring device 3, second temperature measuring device 4, controller 5, water inlet pipe 6, bypass pipe 7, bypass valve 8. Detailed Description of the Embodiments

[0019] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present invention, and should not be construed as a limitation to the present invention.

[0020] Refer to the attached Figure 1And Figure 2 , a blanking elimination system 100 according to an embodiment of the present invention will be described in detail.

[0021] The blanking elimination system 100 according to an embodiment of the present invention includes a heat exchange assembly 1, a flash tank 2, and a first temperature measuring device 3. The heat exchange assembly 1 has a heat release side pipeline and a heat absorption side pipeline. The inlet of the heat release side pipeline is supplied with pressurized condensate, and the inlet of the heat absorption side pipeline is supplied with cooling water. The inlet of the flash tank 2 is communicated with the outlet of the heat release side pipeline. The first temperature measuring device 3 is arranged between the outlet of the heat release side pipeline and the inlet of the flash tank 2 to measure the temperature of the pressurized condensate entering the flash tank 2.

[0022] The pressurized condensate is high-pressure and high-temperature water discharged by the regular blowdown of a steam boiler, or, when high-temperature and high-pressure steam flows in a pipeline, part of the steam will condense into water due to heat dissipation and be discharged through a steam trap as pressurized high-temperature condensate. The pressurized condensate enters the heat release side of the heat exchange assembly 1 through the inlet of the heat release side pipeline, and the cooling water enters the heat absorption side of the heat exchange assembly 1 through the inlet of the heat absorption side pipeline. In the heat exchange assembly 1, the cooling water and the pressurized condensate exchange heat. The temperature of the cooling water rises and the temperature of the pressurized condensate drops. Then, the cooling water is discharged from the outlet of the heat absorption side pipeline, and the pressurized condensate is discharged from the outlet of the heat release side pipeline. After being detected by the first temperature measuring device 3, the temperature of the cooled pressurized condensate is obtained, and then the pressurized condensate enters the flash tank 2. When the temperature measured by the first temperature measuring device 3 is lower than the saturation temperature corresponding to the local atmospheric pressure, no steam will be generated when the flash tank 2 discharges the pressurized condensate.

[0023] Among them, the "local" in the saturation temperature corresponding to the local atmospheric pressure refers to the place where the blanking elimination system 100 according to the embodiment of the present invention is used, and the saturation temperature refers to the temperature when the liquid and the vapor are in a dynamic equilibrium state. For example, if the atmospheric pressure at the place of use is the standard atmospheric pressure of 101.325 KPa, then the corresponding saturation temperature is 100 °C.

[0024] The blanking elimination system 100 according to an embodiment of the present invention exchanges heat for the pressurized condensate entering the flash tank 2 through the heat exchange assembly 1, recovers part of the heat of the pressurized condensate, reduces the temperature of the pressurized condensate, and reduces the temperature of the pressurized condensate to the saturation temperature corresponding to the local atmospheric pressure, so that no steam is generated when the flash tank 2 operates.

[0025] Further, the heat exchange assembly 1 includes a first heat exchanger 11 and a regulating valve 12. The first heat exchanger 11 has a first heat release side and a first heat absorption side. The inlet of the first heat release side is supplied with pressurized condensate, and the outlet of the first heat release side forms the outlet of the heat release side pipeline. The first heat release side of the first heat exchanger 11 forms a part of the heat release pipeline. The inlet of the regulating valve 12 is used to supply cooling water, and the outlet of the regulating valve 12 is communicated with the inlet of the first heat absorption side. The first heat absorption side of the first heat exchanger 11 forms a part of the heat absorption pipeline.

[0026] The regulating valve 12 regulates the flow rate of the cooling water entering the first heat absorption side, thereby being able to regulate the heat exchange amount with the pressurized drain water, so as to ensure that after heat exchange in the first heat exchanger 11, the temperature of the pressurized drain water is lower than the saturation temperature, and then ensure that no steam is generated in the flash tank 2 for the pressurized drain water.

[0027] Specifically, the cooling water entering the first heat absorption side is the cooling water in the circulating cooling system, and the cooling water discharged from the first heat absorption side flows back to the circulating cooling system.

[0028] In some embodiments, the heat exchange assembly 1 further includes a second heat exchanger 13. The second heat exchanger 13 has a second heat release side and a second heat absorption side. The inlet of the second heat release side forms the inlet of the heat release side pipeline. The outlet of the second heat release side is communicated with the inlet of the first heat release side. The second heat release side of the second heat exchanger 13 forms a part of the heat release side pipeline. The inlet of the second heat absorption side is for the cooling water to enter, and the second heat absorption side of the second heat exchanger 13 forms a part of the heat absorption pipeline. When the cooling water enters the second heat absorption side and the pressurized drain water enters the second heat release side, heat exchange occurs between the pressurized drain water and the cooling water in the second heat exchanger 13, thereby reducing the temperature of the pressurized drain water.

[0029] The de - white system 100 of the embodiment of the present invention uses two heat exchangers (the first heat exchanger 11 and the second heat exchanger 13) to participate in the heat exchange of the pressurized drain water. On the one hand, when the two heat exchangers work simultaneously, two - stage heat exchange can be carried out on the pressurized drain water, improving the cooling effect of the pressurized drain water, further ensuring that the temperature of the pressurized drain water entering the flash tank 2 is lower than the saturation temperature, and thus further ensuring that no steam is generated in the flash tank 2. On the other hand, the two heat exchangers can work alternately. When the cooling water on the heat absorption side of one of them is affected by other factors and cannot ensure the cooling water inlet, or when the heat absorption side needs maintenance, etc., the other can work normally, carry out heat exchange between the pressurized drain water and the cooling water, ensure the effective reduction of the temperature of the pressurized drain water, and thus ensure that no steam is generated in the flash tank 2.

[0030] The de - white system 100 of the embodiment of the present invention further includes a second temperature measuring device 4. The second temperature measuring device 4 is arranged between the outlet of the second heat release side and the inlet of the first heat release side. The second temperature measuring device 4 measures the temperature of the pressurized drain water on the second heat release side after passing through the second heat exchanger 13 (the temperature of the first heat release side entering the first heat exchanger 11). Combining the data obtained by the first temperature measuring device 3 is convenient for observing and comparing the temperatures of the pressurized drain water discharged from the heat release sides of the two heat exchangers, so as to facilitate adjusting the flow rate of the cooling water on the first heat absorption side of the first heat exchanger 11, thereby ensuring the heat exchange effect between the pressurized drain water and the cooling water, the cooling effect of the pressurized drain water, ensuring the temperature of the pressurized drain water entering the flash tank 2, and then further ensuring that no steam is generated in the flash tank 2.

[0031] Specifically, after the pressurized drain water passes through the second heat exchanger 13 and the second temperature measuring device 4 measures that the temperature is lower than the saturation temperature corresponding to the local atmospheric pressure, the control valve 12 can be closed to stop the water supply to the first heat absorption side of the first heat exchanger 11. Then, when the pressurized drain water flows through the first heat exchanger 11, it no longer exchanges heat and cools down. When the second temperature measuring device 4 measures that the temperature is higher than the saturation temperature corresponding to the local atmospheric pressure, the control valve 12 is opened and the opening degree of the control valve 12 is adjusted to increase the water inlet flow rate of the first heat absorption side of the first heat exchanger 11, ensuring that the temperature of the pressurized drain water after passing through the first heat exchanger 11 is reduced below the saturation temperature.

[0032] Specifically, both the first temperature measuring device 3 and the second temperature measuring device 4 are temperature sensors.

[0033] Specifically, the cooling water entering the second heat absorption side is the water to be heated in the water use system, that is, process water. For example, the make-up water for the deaerator, the condensate water of the steam turbine condenser. The heated process water discharged from the second heat absorption side enters the corresponding water use system. The second heat exchanger 13 exchanges heat between the pressurized drain water and the process water to be heated, thereby recovering a part of the heat of the pressurized drain water and reducing the energy consumed for heating the process water in the water use system.

[0034] In some embodiments, as Figure 2 shown, the inlet of the second heat absorption side is provided with a water inlet pipe 6. The water inlet pipe 6 is used for supplying cooling water to enter, that is, the water inlet pipe 6 is used to communicate with the water use system to supply the water to be heated (process water) to enter the second heat absorption side. The dewhite system 100 further includes a bypass pipe 7 and a bypass valve 8. The bypass pipe 7 is arranged on the water inlet pipe 6, and the bypass valve 8 is arranged on the bypass pipe. The flow rate of the process water is controlled and adjusted by its water use system. In the case of no process water, that is, when no cooling water enters the water inlet pipe, the pressure of the water inlet pipe and the second heat absorption side is adjusted through the bypass valve.

[0035] In some embodiments, the dewhite system 100 further includes a controller 5. The controller 5 is connected to the first temperature measuring device 3, the second temperature measuring device 4, and the control valve 12. The controller 5 acquires the temperature data of the first temperature measuring device 3 and the temperature data of the second temperature measuring device 4. The controller 5 controls the opening degree of the control valve 12, controls the opening, closing, and flow rate adjustment of the control valve 12, thereby being able to improve the automation degree of the dewhite system 100 of the embodiments of the present invention.

[0036] Specifically, both the first heat exchanger 11 and the second heat exchanger 13 are water-water heat exchangers. The water-water heat exchanger is small in volume and occupies less space. Compared with the method in the related art of using a steam-water heat exchanger to exchange heat with the steam generated by the flash tank 2, the de-white system 100 of the embodiment of the present invention occupies less space and can ensure that no steam is generated (that is, the flash tank 2 does not discharge steam externally). Compared with the method of spraying water to cool the steam generated by the flash tank in the related art, the de-white system 100 of the embodiment of the present invention has the advantages of water saving and energy saving.

[0037] Refer to the appendix Figure 1 , taking the pressurized condensate with a pressure of 5 MPa, a temperature of 265 °C, and a flow rate of 6 t / h as an example for illustration. This saturated condensate sequentially passes through the second heat release side of the second heat exchanger 13, the second temperature measuring device 4, the first heat release side of the first heat exchanger 11, the first temperature measuring device 3, and finally enters the drain flash tank 2.

[0038] Under normal conditions, the cooling water entering the second heat absorption side of the second heat exchanger 13 is the 40 °C condensate of the steam turbine condenser, with a normal flow rate of 60 t / h. After heat exchange in the second heat exchanger 13, the temperature is 57.5 °C. The temperature of this saturated condensate (pressurized condensate) at the outlet of the second heat release side of the second heat exchanger 13 is 90 °C. Since 90 °C is lower than the saturation temperature, the regulating valve 12 is closed, disconnecting the circulating cooling water from entering the first heat exchanger 11, and the flow rate of the circulating cooling water is zero. Under the condition of no condensate from the steam turbine condenser, the water inflow into the second heat absorption side of the second heat exchanger 13 is 0, and the regulating valve 12 is opened to allow the circulating cooling water to enter the first heat absorption side of the first heat exchanger 11, so that the flow rate of the circulating cooling water is 100 t / h. The temperature of the cooling water entering and leaving the first heat exchanger 11 is 32 °C / 42 °C, and the temperature of this saturated condensate (pressurized condensate) at the outlet of the second heat release side of the second heat exchanger 13 is 90 °C.

[0039] The pressurized condensate below the saturation temperature enters the flash tank 2, expands to generate low-pressure condensate, and no steam is generated. It should be noted that, to ensure the safety of the flash tank 2, the pipeline connecting the flash tank 2 to the air is still retained.

[0040] Thus, the de-white system 100 of the embodiment of the present invention recovers the heat of the pressurized condensate, avoids waste of energy, the flash tank 2 does not generate steam, and has the advantages of less occupied space, water saving and energy saving.

[0041] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the orientation or positional relationships shown in the drawings. These are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation on the present invention.

[0042] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of these features. In the description of the present invention, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0043] In the present invention, unless otherwise clearly specified and limited, the terms "mounted", "connected", "coupled", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or communicable with each other; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] In the present invention, unless otherwise clearly specified and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0045] In the present invention, terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0046] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A descaling system (100), characterized in that: include: A heat exchange component (1), the heat exchange component (1) comprising a heat release side pipeline and a heat absorption side pipeline, the inlet of the heat release side pipeline is for pressurized drain water to enter, and the inlet of the heat absorption side pipeline is for cooling water to enter; an expansion tank (2), the inlet of the expansion tank (2) being in communication with the outlet of the heat release side pipeline; and A first temperature measuring device (3) is provided between the outlet of the heat release side pipeline and the inlet of the expansion tank (2) to measure the temperature of the pressurized drain entering the expansion tank (2).

2. The descaling system (100) according to claim 1, characterized in that: The heat exchange component (1) comprises a first heat exchanger (11) and a regulating valve (12), wherein the first heat exchanger (11) has a first heat release side and a first heat absorption side, wherein the inlet of the first heat release side is supplied with pressurized drain water, and the outlet of the first heat release side forms the outlet of the heat release side pipeline, and the inlet of the regulating valve (12) is used for supplying cooling water, and the outlet of the regulating valve (12) is connected to the inlet of the first heat absorption side.

3. The descaling system (100) according to claim 2, characterized in that: The heat exchange component (1) further comprises a second heat exchanger (13), the second heat exchanger (13) having a second heat release side and a second heat absorption side, the inlet of the second heat release side forming the inlet of the heat release side pipeline, the outlet of the second heat release side being connected to the inlet of the first heat release side, and the inlet of the second heat absorption side for cooling water to enter.

4. The descaling system (100) according to claim 3, characterized in that: It further comprises a second temperature measuring device (4), wherein the second temperature measuring device (4) is arranged between the second heat release side outlet and the first heat release side inlet.

5. The descaling system (100) according to claim 4, characterized in that: It further comprises a controller (5), wherein the controller (5) is connected to the first temperature measuring device (3), the second temperature measuring device (4) and the regulating valve (12).

6. The descaling system (100) according to claim 5, characterized in that: The inlet of the second heat absorption side is provided with a water inlet pipe, and the water inlet pipe is used to supply cooling water. The descaling system (100) further comprises a bypass pipe and a bypass valve, and the bypass pipe is arranged on the water inlet pipe, and the bypass valve is arranged on the bypass pipe.

7. The descaling system (100) according to claim 3, characterized in that: The cooling water entering the second heat absorbing side is the water to be heated in the water system.

8. The descaling system (100) according to claim 3, characterized in that: The first heat exchanger (11) and the second heat exchanger (13) are both water-to-water heat exchangers.

9. The descaling system (100) according to claim 2, characterized in that: The cooling water entering the first heat absorption side is cooling water in the circulating cooling system.

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