Steam condensate heat recovery system

Abstract

The utility model relates to the technical field of heat recovery, in particular to a steam condensate heat recovery system. A condensate water decompression storage device connected with a current-effect steam heating device in a multi-effect evaporation device is arranged. And the steam output end of the condensate water pressure reduction storage device is connected with a next-effect steam heating device. Live steam is converted into condensate water after passing through the current-effect steam heating device, and then the condensate water enters the condensate water decompression storage device. The condensate water is subjected to pressure reduction treatment in the condensate water pressure reduction storage device to generate a self-evaporation phenomenon, and evaporated steam is output from the steam output end of the condensate water pressure reduction storage device and then enters a next-effect steam heating device. Therefore, part of the heat of the condensate water is recycled, the utilization efficiency of the steam is improved, and the technical problem that in the prior art, the utilization efficiency of the steam is low is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of heat recovery, in particular to a steam condensate water heat recovery system. Background Art

[0002] FC multi-effect evaporation is usually used in high-salt wastewater evaporation projects. The heat of multi-effect evaporation comes from raw steam outside the boundary. The raw steam is heat-exchanged by the steam heating device, and the condensed water is concentrated in the storage tank and then transported to the outside through the condensed water pump. The condensed water formed by the raw steam after one heat exchange still has a certain amount of heat, but the heat of the condensed water in the prior art is not further recycled, resulting in a technical problem of low steam utilization efficiency. Utility Model Content

[0003] The utility model provides a steam condensate heat recovery system, which solves the technical problem of low steam utilization efficiency in the prior art.

[0004] In order to solve the above technical problems, the technical solution adopted in this embodiment is as follows:

[0005] In some embodiments, the utility model provides a steam condensate heat recovery system, comprising a multiple-effect evaporation device and a condensate pressure reduction storage device; the condensate input end of the condensate pressure reduction storage device is connected to the condensate output end of the current-effect steam heating device in the multiple-effect evaporation device; the steam output end of the condensate pressure reduction storage device is connected to the steam input end of the next-effect steam heating device in the multiple-effect evaporation device; the evaporation circulating liquid input end and output end of the current-effect steam heating device are respectively connected to the evaporation circulating liquid output end and input end of the current-effect evaporation separation device in the multiple-effect evaporation device; the evaporation circulating liquid input end and output end of the next-effect steam heating device are respectively connected to the evaporation circulating liquid output end and input end of the next-effect evaporation separation device in the multiple-effect evaporation device.

[0006] In some embodiments, the steam output end of the condensed water decompression storage device is connected to the steam delivery pipeline between the current effect evaporation separation device and the next effect steam heating device.

[0007] In some embodiments, the pressure value of the condensed water decompression storage device is the same as the pressure value of the current-effect evaporation separation device.

[0008] In some implementations, the pressure value ranges from -30 to -50 KPa.

[0009] In some embodiments, the number of the condensate decompression storage devices is the number of the steam heating devices minus one, and each of the steam heating devices from the first effect to the previous effect of the last effect is connected to a condensate decompression storage device.

[0010] In some embodiments, the multi-effect evaporation device includes any one of a two-effect evaporation device, a three-effect evaporation device, a four-effect evaporation device, and a five-effect evaporation device.

[0011] In some embodiments, the condensed water reduced pressure storage device is a reduced pressure flash tank.

[0012] Beneficial Effects

[0013] The raw steam of the utility model is converted into condensed water after passing through the current steam heating device, and then the condensed water enters the condensed water decompression storage device. After the condensed water is decompressed in the condensed water decompression storage device, self-evaporation will occur, and the evaporated steam is output from the steam output end of the condensed water decompression storage device and enters the next steam heating device. At this point, the heat of the condensed water is partially recycled, the utilization efficiency of the steam is improved, and the technical problem of low steam utilization efficiency in the prior art is solved.

[0014] Additional aspects and advantages of the embodiments of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be understood through the practice of the embodiments of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0016] The methods, systems and / or programs in the accompanying drawings will be further described according to exemplary embodiments. These exemplary embodiments will be described in detail with reference to the drawings. These exemplary embodiments are non-limiting exemplary embodiments, wherein example numbers represent similar mechanisms in the various views of the accompanying drawings.

[0017] Figure 1 It is a structural schematic diagram of a steam condensate heat recovery system provided in one embodiment of the utility model.

[0018] Description of reference numerals:

[0019] 01-current effect steam heating device; 02-current effect evaporation separation device; 03-condensed water pressure reduction storage device; 04-next effect steam heating device; 05-next effect evaporation separation device. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical scheme and advantages of the embodiment of the utility model clearer, the technical scheme in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, rather than all the embodiments. The components of the embodiment of the utility model generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiment of the utility model provided in the drawings is not intended to limit the scope of the utility model for protection, but merely represents the selected embodiment of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the utility model.

[0021] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0022] In the description of the present invention, it should be noted that the terms "first", "second", "third", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0023] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] In an embodiment of the first aspect, the utility model provides a steam condensate heat recovery system, comprising a condensate decompression storage device connected to a current effect steam heating device in a multiple-effect evaporation device. The steam output end of the current condensate decompression storage device is connected to a next effect steam heating device.

[0025] by Figure 1 Taking the two-effect evaporation device shown as an example, the two-effect evaporation device includes a current-effect steam heating device 01, a current-effect evaporation separation device 02, a condensed water decompression storage device 03, a next-effect steam heating device 04, and a next-effect evaporation separation device 05. In the two-effect evaporation device, the current-effect steam heating device 01, the current-effect evaporation separation device 02, and the condensed water decompression storage device 03 belong to the first effect. The next-effect steam heating device 04 and the next-effect evaporation separation device 05 belong to the second effect. In the two-effect evaporation device, the second effect is also the last effect.

[0026] Among them, the steam input end of the current-effect steam heating device 01 is connected to the steam delivery pipeline outside the boundary, and its condensed water output end is connected to the condensed water input end of the condensed water pressure reduction storage device 03. When the evaporation circulation liquid input end and output end of the current-effect evaporation separation device 02 are respectively connected to the evaporation circulation liquid output end and input end of the current-effect steam heating device 01, and its steam output end is connected to the steam input end of the next-effect steam heating device 04. The steam output end of the condensed water pressure reduction storage device 03 is connected to the steam input end of the next-effect steam heating device 04, and its condensed water output end is connected to the outside of the boundary through the first drainage pump. The evaporation circulation liquid output end and input end of the next-effect steam heating device 04 are respectively connected to the evaporation circulation liquid input end and output end of the next-effect evaporation separation device 05, and its condensed water output end is connected to the outside of the boundary through the second drainage pump. The steam output end of the next-effect evaporation separation device 05 is connected to the outside of the boundary.

[0027] When the raw steam passes through the current steam heating device 01, it exchanges heat with the evaporation circulating liquid in the current steam heating device 01 and is converted into condensed water, and then the condensed water enters the condensed water decompression storage device 03. After the condensed water is decompressed in the condensed water decompression storage device 03, the self-evaporation phenomenon will occur. The evaporated steam is output from the steam output end of the condensed water decompression storage device 03 and enters the next steam heating device 04, and exchanges heat with the evaporation circulating liquid in the next steam heating device 04. At this point, the heat of the condensed water is partially recycled, which improves the utilization efficiency of the steam.

[0028] Furthermore, the steam output end of the condensed water decompression storage device 03 is connected to the steam delivery pipeline between the current effect evaporation separation device 02 and the next effect steam heating device 04. The steam that evaporates from the condensed water decompression storage device 03 can be mixed with the steam generated by the current effect evaporation separation device 02 and then enter the next effect steam heating device 04. Since the steam that evaporates from the condensed water decompression storage device is lower in temperature than the steam generated by the current effect evaporation separation device 02, when the two are mixed in the aforementioned delivery pipeline, the superheat of the steam generated by the current effect evaporation separation device 02 can be reduced, thereby improving the overall steam heat exchange efficiency.

[0029] Furthermore, the pressure value of the condensed water decompression storage device 03 is the same as the pressure value of the current evaporation separation device. Figure 1 Taking the two-effect evaporation device shown as an example, the steam evaporated from the condensed water pressure reducing storage device 03 needs to be mixed with the steam generated by the current effect evaporation separation device 02 in the delivery pipeline, and then enter the next effect steam heating device 04 together. The pressure value of the condensed water pressure reducing storage device 03 is set to be the same as that of the current effect evaporation separation device 02, so that the pressure of the steam when mixed in the delivery pipeline can remain unchanged, and the pressure value in the delivery pipeline is in a stable state, thereby ensuring the stable operation of the system.

[0030] Specifically, the aforementioned pressure value has a range of -30 to -50 KPa. In actual application, the steam entering the current steam heating device 01 is usually saturated steam with a pressure range of 0.2 to 1.0 MPa, and the pressure of the steam condensate formed after heat exchange in the current steam heating device 01 is in the range of 0.1 to 0.7 MPa. The pressure is set to -30 to -50 KPa in the condensate pressure reduction storage device 03. After the evaporated steam enters the delivery pipeline between the current evaporation separation device 02 and the next steam heating device 04, it is mixed with the steam with a pressure range of -30 to -50 KPa and enters the next steam heating device 04 together.

[0031] In some embodiments, the number of condensed water decompression storage devices 03 is the number of steam heating devices minus one, and each steam heating device from the first effect to the last effect is connected to a condensed water decompression storage device 03. That is, except for the last effect steam heating device, the condensed water discharged by each steam heating device can be decompressed by the condensed water decompression storage device 03 connected thereto, and then input into the next effect steam heating device after evaporation to generate steam. It can maximize steam heat recovery and improve steam utilization efficiency.

[0032] In some embodiments, the aforementioned multi-effect evaporation device may be any one of a two-effect evaporation device, a three-effect evaporation device, a four-effect evaporation device, and a five-effect evaporation device.

[0033] Specifically, the condensed water reduced pressure storage device 03 may be a reduced pressure flash tank.

[0034] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations on the present invention. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. Steam condensate heat recovery system, characterized in that: It comprises a multiple-effect evaporation device and a condensed water decompression storage device (03); the condensed water input end of the condensed water decompression storage device (03) is connected to the condensed water output end of the current-effect steam heating device (01) in the multiple-effect evaporation device; the steam output end of the condensed water decompression storage device (03) is connected to the steam input end of the next-effect steam heating device (04) in the multiple-effect evaporation device; the evaporation circulation liquid input end and output end of the current-effect steam heating device (01) are respectively connected to the evaporation circulation liquid output end and input end of the current-effect evaporation separation device (02) in the multiple-effect evaporation device; the evaporation circulation liquid input end and output end of the next-effect steam heating device (04) are respectively connected to the evaporation circulation liquid output end and input end of the next-effect evaporation separation device (05) in the multiple-effect evaporation device.

2. The steam condensate heat recovery system according to claim 1, characterized in that: The steam output end of the condensed water decompression storage device (03) is connected to the steam delivery pipeline between the current effect evaporation separation device (02) and the next effect steam heating device.

3. The steam condensate heat recovery system according to claim 2, characterized in that: The pressure value of the condensed water decompression storage device (03) is the same as the pressure value of the current-effect evaporation separation device (02).

4. The steam condensate heat recovery system according to claim 3, characterized in that: The pressure value range is: -30 to -50 KPa.

5. The steam condensate heat recovery system according to claim 1, characterized in that: The number of the condensate decompression storage devices (03) is the number of the steam heating devices minus one, and each of the steam heating devices from the first effect to the last effect is connected to a condensate decompression storage device (03).

6. The steam condensate heat recovery system according to claim 1, characterized in that: The multi-effect evaporation device includes any one of a two-effect evaporation device, a three-effect evaporation device, a four-effect evaporation device, and a five-effect evaporation device.

7. The steam condensate heat recovery system according to claim 1, characterized in that: The condensed water reduced pressure storage device (03) is a reduced pressure flash tank.

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