Steam supplementing pipeline based on evaporation heat exchange system

Abstract

The utility model discloses a steam supplementing pipeline based on an evaporation heat exchange system. The steam supplementing pipeline comprises a horizontal pipe heat exchanger, a salt precipitation circulation pipeline, a salt precipitation tank, a steam compressor, a condensate water bucket and a new high-temperature and high-pressure steam input pipeline. The steam compressor is used for compressing secondary unsaturated steam which is generated by the self-precipitation salt tank and input through the first steam pipeline and then conveying high-temperature and high-pressure saturated steam to the second steam pipeline; the steam generator is used for generating new high-temperature and high-pressure saturated steam and conveying the new high-temperature and high-pressure saturated steam into the second steam pipeline, and when steam in the steam channel serving as a heat source of the transverse pipe heat exchanger is insufficient or the whole system is started in a cold state, the new saturated high-temperature and high-pressure steam can be input into the second steam pipeline. The high-salt-content wastewater passing through the feed liquid passage can be continuously and stably subjected to evaporative crystallization, or the whole evaporative crystallization system can be smoothly started in a cold state, so that the evaporation effect and the treatment efficiency of the whole evaporative crystallization process are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to wastewater treatment technical field especially, relates to a steam supplement pipeline based on evaporative heat exchange system. BACKGROUND

[0002] With the rapid development of our country's industry, a large amount of high salt wastewater is produced in the industrial production process, and this kind of wastewater has high corrosivity, biological refractory and environmental pollution. The traditional high salt wastewater treatment can adopt evaporation crystallization technology, and the salt in wastewater is evaporated to realize water and salt separation. However, if the steam as the heat source of the heat exchanger is insufficient, it will lead to insufficient heat exchange efficiency in the heat exchange system, and further destroy the thermal balance of the whole heat exchange system, finally affect the evaporation effect and treatment efficiency of the whole evaporation crystallization process, and even lead to the difficulty of the whole evaporation crystallization process.

[0003] Therefore, it is necessary to provide a steam supplement pipeline based on evaporative heat exchange system to overcome the above defects. UTILITY MODEL CONTENT

[0004] The utility model aims at providing a steam supplement pipeline based on evaporative heat exchange system, which aims at solving the problem of insufficient steam in the heat source of the heat exchanger and improving the evaporation effect and treatment efficiency of the whole evaporation crystallization process.

[0005] In order to achieve the above purpose, the utility model provides a steam supplement pipeline based on evaporative heat exchange system, which comprises:

[0006] The horizontal tube heat exchanger comprises a liquid channel and a steam channel for heat exchange.

[0007] The salt separation circulating pipeline is communicated with both ends of the liquid channel.

[0008] The salt separation tank is connected with one end of the salt separation circulating pipeline and one end of the steam channel; the liquid in the salt separation circulating pipeline is heated by the horizontal heat exchange tube, and the secondary unsaturated steam is generated in the salt separation tank.

[0009] The steam compressor is communicated with the salt separation circulating pipeline through the first steam pipeline and communicated with one end of the steam channel through the second steam pipeline; the steam compressor is used for compressing the secondary unsaturated steam generated from the salt separation tank and input through the first steam pipeline, and then conveying the high-temperature and high-pressure saturated steam to the second steam pipeline.

[0010] The condensate barrel is communicated with one end of the steam channel away from the second steam pipeline, so as to receive the high-temperature condensate water formed by the high-temperature and high-pressure saturated steam in the steam channel and the liquid channel after heat exchange.

[0011] A new high-temperature and high-pressure steam input pipeline, one end of which is connected with a steam generator, and the other end is connected with the second steam pipeline; the steam generator is used to generate new high-temperature and high-pressure steam and deliver it into the second steam pipeline.

[0012] In a preferred embodiment, a temperature sensor, a flow meter and a pressure sensor are arranged on the new high-temperature and high-pressure steam input pipeline.

[0013] In a preferred embodiment, an outlet gate valve is arranged on the new high-temperature and high-pressure steam input pipeline, which is used to control the on-off of the new high-temperature and high-pressure steam input pipeline.

[0014] In a preferred embodiment, a steam and water drainage pipeline is arranged in the middle of the new high-temperature and high-pressure steam input pipeline; the steam and water drainage pipeline is arranged below the new high-temperature and high-pressure steam input pipeline, and is used to drain the condensed water condensed on the inner wall of the new high-temperature and high-pressure steam input pipeline.

[0015] In a preferred embodiment, the steam and water drainage pipeline is provided with a steam and water drainage pipeline front stop valve, a Y-type filter, a steam and water drainage valve and a steam and water drainage pipeline rear stop valve.

[0016] In a preferred embodiment, the steam and water drainage pipeline is further provided with a steam and water drainage bypass, two ends of which are respectively connected to the steam and water drainage pipeline front stop valve and one end of the steam and water drainage pipeline rear stop valve away from each other; the steam and water drainage bypass is further provided with a steam and water drainage bypass stop valve.

[0017] In a preferred embodiment, a predetermined position of the second steam pipeline is provided with a steam exhaust pipeline in communication with the outside; the steam exhaust pipeline is provided with a first exhaust hand valve, a second exhaust hand valve and a safety valve.

[0018] In a preferred embodiment, a predetermined position of the cross-pipe heat exchanger is provided with a non-condensable gas discharge pipeline in communication with the outside; the non-condensable gas discharge pipeline is provided with a first non-condensable gas discharge hand valve and a flow limiting orifice plate; the first non-condensable gas discharge hand valve is used to control the on-off of the non-condensable gas discharge pipeline, and the flow limiting orifice plate is used to adjust the flow of the non-condensable gas discharge pipeline.

[0019] In a preferred embodiment, the non-condensable gas discharge pipeline is connected in parallel with a non-condensable gas discharge bypass, which is provided with a second non-condensable gas discharge hand valve and a non-condensable gas regulating valve; the second non-condensable gas discharge hand valve is used to control the on-off of the non-condensable gas discharge bypass, and the non-condensable gas regulating valve is used to adjust the flow of the non-condensable gas discharge bypass.

[0020] The steam supplement pipeline based on the evaporation heat exchange system provided by the utility model, by connecting the new high-temperature high-pressure steam input pipeline between the steam generator and the second steam pipeline, when the steam passage steam as the heat source of the cross-pipe heat exchanger is insufficient or the whole system is started, the high-temperature high-pressure saturated steam can be input to the second steam pipeline in time, the evaporation crystallization of the high-salt wastewater in the liquid passage can be continuously and stably ensured, or the whole evaporation crystallization system can be started smoothly under the cold state, and then the evaporation effect and the processing efficiency of the whole evaporation crystallization process are improved. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical scheme of the embodiments of the utility model, the following will be briefly introduced the drawings needed to be used in the embodiments, it should be understood, the following drawings only shows some embodiments of the utility model, therefore should not be regarded as the limitation to the scope, for the ordinary skilled person in the art, under the premise of not paying the creative labor, can also obtain other related drawings according to these drawings.

[0022] Figure 1 The pipeline schematic diagram of the steam supplement pipeline based on the evaporation heat exchange system provided by the utility model is provided.

[0023] Marked in the figure: 100, steam supplement pipeline based on evaporation heat exchange system.

[0024] 10, cross-pipe heat exchanger;11, liquid passage;12, steam passage;20, salt separation circulation pipeline;21, salt separation tank;22, circulating pump;23, circulation pipeline;

[0025] 30, steam compressor;301, first steam pipeline;302, second steam pipeline;40, condensate barrel;50, new high-temperature high-pressure steam input pipeline;51, steam generator;52, flow meter;53, pressure sensor;54, temperature sensor;55, outlet gate valve;

[0026] 60, steam drain pipeline;61, steam drain pipeline front stop valve;62, steam drain pipeline rear stop valve;63, Y-type filter;64, drain valve;601, steam drain bypass;602, steam drain bypass stop valve;

[0027] 70, steam evacuation pipeline;71, first evacuation valve;72, second evacuation valve;73, safety valve;80, non-condensable gas discharge pipeline;81, first non-condensable gas discharge hand valve;82, flow limiting orifice plate;801, non-condensable gas discharge bypass;802, second non-condensable gas discharge hand valve;803, non-condensable gas regulating valve. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical scheme and beneficial technical effects of the utility model clearer and more understandable, the utility model will be further described in detail below in combination with the drawings and specific embodiments. It should be understood that the specific embodiments described in the specification are only for the purpose of explaining the utility model and are not intended to limit the utility model.

[0029] It should also be understood that the terms used in this utility model specification are only for the purpose of describing specific embodiments and are not intended to limit the utility model. As used in the utility model specification and the appended claims, the singular forms "a", "an" and "the" are intended to include the plural forms unless the context clearly indicates otherwise.

[0030] It should be further understood that the term "and / or" used in the utility model specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes these combinations.

[0031] In an embodiment of the utility model, a steam supplement pipeline 100 based on an evaporation heat exchange system is provided for timely supplementing high-temperature steam when the steam of the entire device or heat source is insufficient.

[0032] As shown in Figure 1 The steam supplement pipeline 100 based on the evaporation heat exchange system includes a cross-pipe heat exchanger 10, a salt separation circulation pipeline 20, a steam compressor 30, a condensate bucket 40, and a new high-temperature high-pressure steam input pipeline 50.

[0033] The cross-pipe heat exchanger 10 includes a feed liquid passage 11 and a steam passage 12 for heat exchange. The feed liquid passage 11 and the steam passage 12 are arranged in the same direction in countercurrent, so that efficient heat exchange can be performed. Here, the feed liquid passage 11 is defined as a cold source to increase the temperature of the internal fluid, and the steam passage 12 is a heat source for high-temperature high-pressure saturated steam (i.e., high-temperature water vapor) to flow, so as to provide heat to the fluid in the feed liquid passage 11. After heat exchange, part of the high-temperature water vapor in the gaseous state (e.g., 160-170℃) will condense into liquid high-temperature condensate water (e.g., 80-95℃).

[0034] The two ends of the salt separation circulating pipeline 20 are respectively communicated with the two ends of the liquid channel 11. The salt separation circulating pipeline 20 comprises a salt separation tank 21, a circulating pump 22 and a circulating pipeline 23, and the circulating pipeline 23 communicates the inside and outside of the salt separation tank 21. The salt separation tank 21 connects one end of the salt separation circulating pipeline 20 and one end of the steam channel 12. The liquid in the salt separation circulating pipeline 20 is heated by the cross-pipe heat exchanger 10, and then generates secondary unsaturated steam in the salt separation tank 21. The low-temperature evaporated raw water enters the liquid channel 11, thereby realizing the circulation in the salt separation circulating pipeline 20 and participating in the evaporation and crystallization process. In the evaporation and crystallization process, the separated salt crystals precipitate at the bottom of the salt separation tank 21, and the generated secondary unsaturated steam accumulates at the top of the salt separation tank 21.

[0035] The steam compressor 30 is communicated with the salt separation circulating pipeline 20 (specifically, the top of the salt separation tank 21) through the first steam pipeline 301, and is communicated with one end of the steam channel 12 through the second steam pipeline 302. The steam compressor 30 is used to compress the secondary unsaturated steam generated from the salt separation tank 21 and input through the first steam pipeline 301, and then deliver high-temperature and high-pressure saturated steam to the second steam pipeline 302. Specifically, the steam from the top of the salt separation tank 21 can enter the steam compressor 30 through the first steam pipeline 301. The steam compressor 30 compresses the secondary unsaturated steam, converts electrical energy into heat energy to obtain high-quality high-temperature and high-pressure saturated steam, and then delivers the high-temperature and high-pressure saturated steam to the steam channel 12 to provide a heat source.

[0036] The condensate bucket 40 is communicated with the end of the steam channel 12 away from the second steam pipeline 302, so as to receive the high-temperature condensate water formed by the high-temperature and high-pressure saturated steam in the steam channel 12 after heat exchange with the liquid channel 11. It can be understood that after heat exchange, the high-temperature and high-pressure saturated steam is condensed from gas to liquid, and then flows into the condensate bucket 40 for collection. The high-temperature condensate water can be used to preheat the low-temperature evaporated raw water, or can be used for other purposes.

[0037] In the embodiment of the utility model, one end of new high temperature and high pressure steam input pipeline 50 is connected with steam generator 51, and the other end is connected with second steam pipeline 302. Steam generator 51 is used to generate new high temperature and high pressure saturated steam and deliver to second steam pipeline 302. It can be understood that if the steam quantity in steam passage 12 is insufficient or the temperature is not enough, it will lead to that the circulating liquid in circulating pipeline 23 does not reach the predetermined temperature, and the secondary unsaturated steam generated in the evaporation crystallization is insufficient, further makes steam compressor 30 cannot generate enough high quality high temperature and high pressure saturated steam, finally will destroy the heat balance of the whole heat exchange system, makes the whole evaporation crystallization process difficult to continue. Therefore, at this time, new high temperature and high pressure steam input pipeline 50 can be used to supplement high temperature and high pressure saturated steam in second steam pipeline 302, so that salt separation circulating pipeline 20 can normally operate, and enough secondary unsaturated steam can also be provided for steam compressor 30.

[0038] Among them, flow meter 52, pressure sensor 53, temperature sensor 54 and the like are arranged on new high temperature and high pressure steam input pipeline 50, so as to monitor the steam parameters in new high temperature and high pressure steam input pipeline 50, avoid that the supplemented steam quantity is too much or too little, thereby guaranteeing the steam quality.

[0039] Outlet gate valve 55 is arranged on new high temperature and high pressure steam input pipeline 50, and outlet gate valve 55 is used to control the on-off of new high temperature and high pressure steam input pipeline 50. That is, when steam needs to be supplemented, outlet gate valve 55 is opened, when steam does not need to be supplemented, outlet gate valve 55 is closed, avoiding that the high temperature and high pressure steam generated by steam compressor 30 in second steam pipeline 302 flows back.

[0040] Further, steam drain pipeline 60 is further arranged in the middle of new high temperature and high pressure steam input pipeline 50. Steam drain pipeline 60 is arranged below new high temperature and high pressure steam input pipeline 50, and is used to drain the condensate condensed on the inner wall of new high temperature and high pressure steam input pipeline 50. It should be noted that part of heat is lost in the steam delivery process (the longer the delivery pipeline, the more the loss), so a small amount of steam will condense into condensate. This part of condensate can be drained through steam drain pipeline 60, avoiding that the condensate forms water hammer phenomenon in the steam pipe, causing the steam delivery pipe to vibrate.

[0041] Among them, steam drain pipeline 60 is provided with steam drain pipeline front stop valve 61, steam drain pipeline rear stop valve 62, Y type filter 63 and drain valve 64. Further, steam drain pipeline 60 is further provided with steam drain bypass 601. The two ends of steam drain bypass 601 are respectively connected to the ends of steam drain pipeline front stop valve 61 and steam drain pipeline rear stop valve 62 away from each other. Steam drain bypass 601 is further provided with steam drain bypass stop valve 602.

[0042] It should be noted that, under normal circumstances, both the pre-steam trap shut-off valve 61 and the post-steam trap shut-off valve 62 are normally open. Condensate flows sequentially through the pre-steam trap shut-off valve 61, the Y-type filter 63 (which filters impurities), the steam trap 64 (which allows only condensate to pass through, preventing steam from passing), and finally the post-steam trap shut-off valve 62. This is the normal condensate drainage process. The purpose of setting up the pre-steam trap shut-off valves 61 and 62 is to facilitate equipment maintenance. For example, if the steam trap 64 is damaged, the pre-steam trap shut-off valve 61 can be closed, allowing for safe maintenance of the steam trap 64 without worrying about steam leakage.

[0043] In special circumstances: When the steam trap 60 cannot work properly (e.g., during equipment repair or maintenance), the steam trap bypass shut-off valve 602 can be opened to drain water through this bypass. However, since there is no drain valve 64 on this bypass, steam will be carried along with the drain water. Therefore, this bypass is only for emergency use. When using it, either the steam trap bypass shut-off valve 602 should be kept at a certain small opening, or the condensate should be drained after opening the drain and then immediately closed.

[0044] In one embodiment, a steam venting pipe 70 communicating with the outside is provided at a first predetermined position of the second steam pipe 302. The steam venting pipe 70 is provided with a first venting manual valve 71, a second venting manual valve 72, and a safety valve 73. The steam venting pipe 70 is used to vent the internal steam, which facilitates a rapid reduction in the temperature of the liquid in the brine tank 21 when the system is shut down.

[0045] The safety valve 73 automatically opens to release steam in case of system malfunction or overpressure of steam in the pipeline, thus protecting against accidents. The first and second vent valves 71 and 72 are typically used to release steam and cool the system after shutdown, or to release steam and reduce pressure during system operation. The purpose of these two vent valves is to provide double protection against the inherent risks of operating on steam pipelines.

[0046] The predetermined position of the cross-pipe heat exchanger 10 is provided with a non-condensable gas discharge pipeline 80 which is in communication with the outside. The non-condensable gas discharge pipeline 80 is provided with a first non-condensable gas discharge hand valve 81 and a flow limiting orifice plate 82. The first non-condensable gas discharge hand valve 81 is used to control the on-off of the non-condensable gas discharge pipeline 80. The flow limiting orifice plate 82 is used to adjust the flow of the non-condensable gas discharge pipeline 80 by changing the outlet size. Further, the non-condensable gas discharge pipeline 80 is connected in parallel with a non-condensable gas discharge bypass 801. The non-condensable gas discharge bypass 801 is provided with a second non-condensable gas discharge hand valve 802 and a non-condensable gas regulating valve 803. The second non-condensable gas discharge hand valve 802 is used to control the on-off of the non-condensable gas discharge bypass 801. The non-condensable gas regulating valve 803 is used to adjust the flow of the non-condensable gas discharge bypass 801.

[0047] The non-condensable gas discharge pipeline 80 is mainly used to discharge the non-condensable gas in the cross-pipe heat exchanger 10 which affects heat exchange. It should be noted that the non-condensable gas in the pipeline will have a great influence on steam heat exchange, so it is necessary to discharge the non-condensable gas, and the non-condensable gas is discharged by discharging steam together, so the flow limiting orifice plate 82 is used to control the amount of discharged steam to avoid waste of heat.

[0048] In summary, the steam supplement pipeline 100 based on the evaporation heat exchange system provided by the utility model, by connecting the new high-temperature and high-pressure steam input pipeline 50 between the steam generator 51 and the second steam pipeline 302, when the steam in the steam passage 12 which is the heat source of the cross-pipe heat exchanger 10 is insufficient or the whole system is started in a cold state, the new high-temperature and high-pressure saturated steam can be input to the second steam pipeline 302 in time, so that the high-salt wastewater passing through the liquid passage 11 can be continuously and stably evaporated and crystallized, or the whole evaporation and crystallization system can be successfully started in a cold state, thereby improving the evaporation effect and processing efficiency of the whole evaporation and crystallization process.

[0049] The utility model is not limited to the description in the specification and embodiments, so that other advantages and modifications can be easily realized by those skilled in the art, and the utility model is not limited to specific details, representative equipment and the drawing examples shown and described herein without departing from the spirit and scope of the general concept defined by the claims and equivalent ranges.

Claims

1. A steam makeup line based on an evaporative heat exchange system, characterized in that, The application relates to a heat exchanger, which comprises: a cross-pipe heat exchanger, which comprises a material liquid channel and a steam channel for heat exchange; a salt separation circulating pipeline, which is communicated with two ends of the material liquid channel; a salt separation tank, which is connected with one end of the salt separation circulating pipeline and one end of the steam channel; the material liquid in the salt separation circulating pipeline is heated by the cross-pipe heat exchanger, and secondary unsaturated steam is generated in the salt separation tank; a steam compressor, which is communicated with the salt separation circulating pipeline through a first steam pipeline and communicated with one end of the steam channel through a second steam pipeline; the steam compressor is used for compressing the secondary unsaturated steam generated from the salt separation tank and input through the first steam pipeline, and then delivering high-temperature and high-pressure saturated steam to the second steam pipeline; a condensate barrel, which is communicated with one end of the steam channel far away from the second steam pipeline, so as to receive high-temperature condensate water formed by the high-temperature and high-pressure saturated steam in the steam channel after heat exchange with the material liquid channel; a new high-temperature and high-pressure steam input pipeline, one end of which is connected with a steam generator, and the other end is connected with the second steam pipeline; the steam generator is used for generating new high-temperature and high-pressure saturated steam and delivering the steam into the second steam pipeline.

2. The steam makeup line based on the evaporation heat exchange system as claimed in claim 1, characterized in that, The new high-temperature and high-pressure steam input pipeline is provided with a temperature sensor, a flow meter and a pressure sensor.

3. The steam makeup line based on the evaporation heat exchange system as claimed in claim 1, characterized in that, The new high-temperature and high-pressure steam input pipeline is provided with an outlet gate valve, which is used for controlling the on-off of the new high-temperature and high-pressure steam input pipeline.

4. The steam makeup line based on the evaporation heat exchange system as claimed in claim 1, characterized in that, The middle part of the new high-temperature and high-pressure steam input pipeline is further provided with a steam drain pipeline; the steam drain pipeline is arranged below the new high-temperature and high-pressure steam input pipeline, and is used for draining the condensate water condensed on the inner wall of the new high-temperature and high-pressure steam input pipeline.

5. The steam makeup line based on evaporation heat exchange system as claimed in claim 4 wherein, The steam drain pipeline is provided with a steam drain pipeline front stop valve, a Y-shaped filter, a drain valve and a steam drain pipeline rear stop valve.

6. The steam makeup line based on evaporation heat exchange system as claimed in claim 5 wherein, The steam drain pipeline is further provided with a steam drain bypass, two ends of the steam drain bypass are respectively connected to the steam drain pipeline front stop valve and one end of the steam drain pipeline rear stop valve far away from each other; the steam drain bypass is further provided with a steam drain bypass stop valve.

7. The steam makeup line based on evaporation heat exchange system as claimed in claim 1 wherein, A steam exhaust pipeline, which is communicated with the outside, is arranged at a predetermined position of the second steam pipeline; the steam exhaust pipeline is provided with a first exhaust hand valve, a second exhaust hand valve and a safety valve.

8. The steam makeup line based on evaporation heat exchange system as claimed in claim 1 wherein, A non-condensable gas discharge pipeline, which is communicated with the outside, is arranged at a predetermined position of the cross-pipe heat exchanger; the non-condensable gas discharge pipeline is provided with a first non-condensable gas discharge hand valve and a flow limiting orifice; the first non-condensable gas discharge hand valve is used for controlling the on-off of the non-condensable gas discharge pipeline, and the flow limiting orifice is used for limiting the flow of the non-condensable gas discharge pipeline.

9. The steam makeup line based on evaporation heat exchange system as claimed in claim 8 wherein, The non-condensable gas discharge pipeline is parallelly connected with a non-condensable gas discharge bypass; the non-condensable gas discharge bypass is provided with a second non-condensable gas discharge hand valve and a non-condensable gas discharge regulating valve; the second non-condensable gas discharge hand valve is used for controlling the on-off of the non-condensable gas discharge bypass, and the non-condensable gas discharge regulating valve is used for adjusting the flow of the non-condensable gas discharge bypass.

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