A cold and hot evaporation unit for low-temperature distillation

Abstract

The present application discloses a cold and hot evaporation unit for low-temperature distillation, including a kettle body. An atomization chamber is formed at the top inside the kettle body, and a liquid storage chamber is formed at the bottom. A heating chamber is formed in the middle of the liquid storage chamber. The heating chamber is evenly provided with vertical flow channels communicating the top and bottom of the liquid storage chamber. The top and bottom of the liquid storage chamber are respectively communicated with one end of a liquid inlet pipe and one end of a liquid outlet pipe. The other end of the liquid outlet pipe is communicated to the other end of the liquid inlet pipe through a first high-pressure pump. The middle of the liquid inlet pipe is communicated with one end of an atomization pipe. The other end of the atomization pipe is installed with an atomization nozzle. The atomization nozzle is located in the atomization chamber. A screw extrusion vertical channel is formed at the axis of the liquid storage chamber. The present invention reduces the heat energy required for evaporation.

Description

Technical Field

[0001] This application relates to wastewater treatment, and particularly to a cold and hot evaporation unit for low-temperature distillation. Background Art

[0002] Wastewater is an important part of industrial waste, and wastewater discharge will cause serious pollution to the environment. Distillation is a thermodynamic separation process. Compared with other separation means, such as extraction, its advantage is that it does not require the use of other solvents outside the system components, thus ensuring that no new impurities are introduced. Using distillation to treat industrial wastewater not only solves the problem of industrial wastewater discharge, but also enables the recovery and utilization of useful components in industrial wastewater, saving raw materials.

[0003] The evaporation structure originally designed by our company has poor effects after actual use because the inside of the kettle body integrates cavities such as condensation, atomization, and heating. Summary of the Invention

[0004] The purpose of the present invention is to provide a cold and hot evaporation unit for low-temperature distillation to reduce the thermal energy required for evaporation.

[0005] To achieve the above purpose, the present invention provides the following technical solutions.

[0006] The embodiment of the present application discloses a cold and hot evaporation unit for low-temperature distillation, including a kettle body. An atomization cavity is formed at the top inside the kettle body, and a liquid storage cavity is formed at the bottom. A heating cavity is formed in the middle of the liquid storage cavity. The heating cavity is evenly provided with vertical flow channels connecting the top and bottom of the liquid storage cavity. The top and bottom of the liquid storage cavity are respectively connected to one end of a liquid inlet pipe and one end of a liquid outlet pipe. The other end of the liquid outlet pipe is connected to the other end of the liquid inlet pipe through a first high-pressure pump. The middle of the liquid inlet pipe is connected to one end of an atomization pipe. The other end of the atomization pipe is installed with an atomization nozzle. The atomization nozzle is located in the atomization cavity. A screw extrusion vertical channel is formed at the axis of the liquid storage cavity.

[0007] Preferably, in the above cold and hot evaporation unit for low-temperature distillation, a first valve is installed at one end of the atomization pipe close to the liquid inlet pipe. After passing through the first valve, the atomization pipe is divided into two branches, and each branch is installed with the atomization nozzle. One of the atomization nozzles sprays vertically upward, and the other atomization nozzle sprays horizontally. The liquid outlet pipe is connected to a stock solution pipe near the first high-pressure pump, and a second valve is installed on the stock solution pipe.

[0008] Preferably, in the above-mentioned cold and hot evaporation unit for low-temperature distillation, a downward pressing scraper that moves vertically is formed at the top of the screw extrusion vertical channel. The bottom of the screw extrusion vertical channel is transported through the screw extrusion horizontal channel and then output through a sludge discharge pipe. A drain pipe is formed at one end of the screw extrusion horizontal channel close to the sludge discharge pipe, and a filter element is provided on the drain pipe.

[0009] Preferably, in the above-mentioned cold and hot evaporation unit for low-temperature distillation, a first medium is formed in the heating chamber. The first medium is discharged into the compressor through a first pipeline. After the compressor heats the first medium, it is discharged into the interior of the heating chamber through a second pipeline for heating the liquid in the vertical flow channel.

[0010] Preferably, in the above-mentioned cold and hot evaporation unit for low-temperature distillation, the cold energy formed by the compressor cools the vacuum pump through a second medium in a third pipeline. After the second medium cools the vacuum pump, it acts on a heat exchanger through a fourth pipeline. After the second medium cools the steam in the heat exchanger, it flows back to the compressor through a fifth pipeline.

[0011] Preferably, in the above-mentioned cold and hot evaporation unit for low-temperature distillation, the steam in the atomization chamber is discharged into the heat exchanger through a sixth pipeline formed at its top. After cooling, it is discharged into the bottom of the first tank through a seventh pipeline. A liquid storage is formed at the bottom of the first tank, and the height of the liquid storage is higher than the bottom of the seventh pipeline. The vacuum pump evacuates the first tank near the top through a suction pipe.

[0012] Preferably, in the above-mentioned cold and hot evaporation unit for low-temperature distillation, the steam extracted by the vacuum pump flows through an exhaust pipe to a sandwich heating chamber formed outside the kettle body. A first coil is formed inside the atomization chamber. One end of the first coil is connected to the sandwich heating chamber, and the other end extends out of the kettle body in a sealed manner.

[0013] Preferably, in the above-mentioned cold and hot evaporation unit for low-temperature distillation, an overflow pipeline is formed on one side of the first tank. The height of the overflow pipeline is higher than that of the seventh pipeline. The overflow pipeline is connected to the top of a condensate water storage tank. The bottom of the condensate water storage tank is discharged after being connected to a second high-pressure pump through a pipeline.

[0014] Preferably, in the above-mentioned cold and hot evaporation unit for low-temperature distillation, a second coil is formed in the middle of the third pipeline, and the second coil is located inside the condensate water storage tank.

[0015] Preferably, in the above-mentioned cold and hot evaporation unit for low-temperature distillation, the condensate water storage tank is provided with an inspection port and an exhaust valve is formed at the top.

[0016] Compared with the prior art, the advantages of the technical solution of the present invention are that the evaporation stock solution inside the kettle body does not accumulate, and after heat exchange through the vertical flow channel, it is sprayed into the atomization cavity in the form of spray (stock solution, sewage), and water and other foreign substances (concentrated sewage) are separated in a mist state, ensuring a high vacuum limit state in the atomization cavity and reducing the thermal energy required for evaporation. Through actual use, the common evaporation on the market is at -97 kPa / 69.1 degrees under vacuum, while the evaporation of this technical solution is at -99.6 to -99.9 kPa / 7 to 29 degrees under vacuum. Calculated according to the required amount of thermal energy, it can save 40 - 62 kcal / Kg. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings described below are only some embodiments recorded in the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0018] Figure 1 The following shows a schematic diagram of a cold and hot evaporation unit for low-temperature distillation in a specific embodiment of the present invention;

[0019] Figure 2 The following shows a flow diagram of each medium in a cold and hot evaporation unit for low-temperature distillation in a specific embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] The following will combine the drawings in the embodiments of the present invention to describe the technical solutions in the embodiments of the present invention in detail. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0021] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0022] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "linkage" 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 mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components. 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.

[0023] Combined with Figure 1-2 As shown, the cold and hot evaporation unit 100 for low-temperature distillation includes a kettle body 101. An atomization chamber 102 is formed at the top inside the kettle body 101, and a liquid storage chamber 103 is formed at the bottom. A heating chamber 104 is formed in the middle of the liquid storage chamber 103. The heating chamber 104 is evenly provided with vertical flow channels 105 that communicate the top and bottom of the liquid storage chamber 103. The top and bottom of the liquid storage chamber 103 are respectively communicated with one end of a liquid inlet pipe 106 and one end of a liquid outlet pipe 107. The other end of the liquid outlet pipe 107 is communicated with the other end of the liquid inlet pipe 106 through a first high-pressure pump 108. The middle of the liquid inlet pipe 106 is communicated with one end of an atomizing pipe 109. An atomizing nozzle 110 is installed at the other end of the atomizing pipe 109. The atomizing nozzle 110 is located in the atomization chamber 102. A screw extrusion vertical channel 111 is formed at the axis of the liquid storage chamber 103. A first valve 112 is installed at one end of the atomizing pipe 109 close to the liquid inlet pipe 106. After passing through the first valve 112, the atomizing pipe 109 is divided into two branches, and atomizing nozzles 110 are respectively installed on them. One of the atomizing nozzles 110 sprays vertically upward, and the other atomizing nozzle 110 sprays horizontally. The liquid outlet pipe 107 is communicated with a raw liquid pipe 113 near the first high-pressure pump 108, and a second valve 114 is installed on the raw liquid pipe 113.

[0024] In this embodiment, after the first high-pressure pump extracts the raw liquid and pumps it into the liquid storage chamber, the raw liquid heated in the heating chamber is pumped into the atomizing pipe again through the first high-pressure pump (the second valve is closed at this time) and sprayed out from the atomizing nozzle. The atomizing nozzle improves the atomization efficiency, and multiple atomizing nozzles are provided to improve the atomization efficiency.

[0025] Furthermore, a downward pressing scraper 115 that moves vertically is formed at the top of the screw extrusion vertical channel 111. The bottom of the screw extrusion vertical channel 111 is output through a screw extrusion horizontal channel 116 and a sludge discharge pipe 117. A drain pipe 118 is formed at one end of the screw extrusion horizontal channel 116 close to the sludge discharge pipe 117, and a filter element 119 is installed on the drain pipe 118.

[0026] In this embodiment, the separated concentrated sewage is discharged into the horizontal channel from the vertical channel, discharged in a screw extrusion manner, maintaining a vacuum-sealed state. The excess water during the extrusion process is squeezed out through the filter element, and the concentrated sludge is directly extruded.

[0027] Further, a first medium is formed in the heating chamber 104. The first medium is discharged into the compressor 121 through the first pipeline 120. After the compressor 121 heats the first medium, it is discharged into the interior of the heating chamber 104 through the second pipeline 122 for heating the liquid in the vertical flow channel 105.

[0028] In this embodiment, the first medium is preferably a gas, and the first medium continuously circulates for heating and acts on the stock solution in the vertical flow channel.

[0029] Further, the cold energy formed by the compressor 121 cools the vacuum pump 124 through a second medium in the third pipeline 123. After the second medium cools the vacuum pump 124, it acts on the heat exchanger 126 through the fourth pipeline 125. After the second medium cools the steam in the heat exchanger 126, it returns to the compressor 121 through the fifth pipeline 127. The steam in the atomization chamber 102 is discharged into the heat exchanger 126 through a sixth pipeline 128 formed at its top, and after cooling, it is discharged into the bottom of the first tank body 130 through the seventh pipeline 129. A liquid storage is formed at the bottom of the first tank body 130, and the height of the liquid storage is higher than the bottom of the seventh pipeline 129. The vacuum pump 124 evacuates the first tank body 130 near the top through the suction pipe 131.

[0030] In this embodiment, the second medium preferably uses antifreeze to cool the vacuum pump, and then continues to cool the steam. The heated second medium returns to the compressor in a cycle. The flow direction of the steam is that it is extracted by the vacuum pump. The steam first passes through the heat exchanger and condenses due to cooling. The condensed liquid enters the first tank body. The steam continues to be extracted by the vacuum pump. At this time, the steam can be used as a heat source. Due to the action of the vacuum pump, although there is liquid storage in the first tank body, due to the pressure reason, the gas in the seventh pipeline, that is, the heat exchanger, that is, the atomization chamber, is continuously extracted, and the inside of the kettle body remains in a vacuum state.

[0031] Further, the steam extracted by the vacuum pump 124 flows through the exhaust pipe 132 to the sandwich heating chamber 133 formed outside the kettle body 101. A first coil pipe 134 is formed inside the atomization chamber 102. One end of the first coil pipe 134 is connected to the sandwich heating chamber 133, and the other end extends to the outside of the kettle body 101 in a sealed manner.

[0032] In this embodiment, the steam extracted by the vacuum pump can be used as a heat source to heat the outer wall of the kettle body, thereby maintaining the temperature inside the kettle body. At the same time, due to the action of the first coil pipe, it can enter the kettle body to heat the atomized steam. Subsequently, due to cooling, the gas is discharged, and the formed condensed water is also directly discharged from the other end of the first coil pipe.

[0033] Further, an overflow pipeline 135 is formed on one side of the first tank body 130. The height of the overflow pipeline 135 is higher than the height of the seventh pipeline 129. The overflow pipeline 135 is connected to the top of the condensate pool tank 136, and the bottom of the condensate pool tank 136 is discharged after being connected to the second high-pressure pump 137 through a pipeline.

[0034] In this embodiment, when the stored liquid is higher than a certain height, it flows out through the overflow pipeline and then enters the condensate pool tank. Since a negative pressure is formed inside the first tank, a second vacuum pump is also required to pump out the liquid in the condensate pool tank when the liquid is discharged, so as to keep the equipment from releasing vacuum and maintain low-temperature distillation.

[0035] This design adopts the physical overflow gas-liquid separation method of condensate water: a part of water / steam gushes to the bottom of the first tank, and through the action of the stored liquid in the first tank, the steam is fully liquefied. The liquid level of the stored liquid rises and overflows downward, and the vacuum pump pumps air above the liquid level of the stored liquid, preventing excessive steam from flowing to the vacuum pump chamber and causing the vacuum pump to overload.

[0036] Further, a second coil 138 is formed in the middle of the third pipeline 123, and the second coil 138 is located inside the condensate pool tank 136.

[0037] In this embodiment, it is necessary to inhibit the re-evaporation of the distilled water after condensation. If evaporation occurs, it will increase the burden on the vacuum pump and further affect the distillation capacity in the atomization chamber.

[0038] Further, the condensate pool tank 136 is provided with an inspection port 139 and an exhaust valve 140 is formed at the top.

[0039] In this embodiment, it is used for maintenance, exhaust and other functions.

[0040] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element.

[0041] The above are only the specific embodiments of the present application. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present application, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present application.

Claims

1. A cold and hot evaporation unit for low-temperature distillation, characterized in that It includes a kettle body. An atomization chamber is formed at the top inside the kettle body, and a liquid storage chamber is formed at the bottom. A heating chamber is formed in the middle of the liquid storage chamber. The heating chamber is evenly provided with vertical flow channels communicating the top and bottom of the liquid storage chamber. The top and bottom of the liquid storage chamber are respectively communicated with one end of a liquid inlet pipe and one end of a liquid outlet pipe. The other end of the liquid outlet pipe is connected to the other end of the liquid inlet pipe through a first high-pressure pump. The middle of the liquid inlet pipe is communicated with one end of an atomizing pipe. The other end of the atomizing pipe is installed with an atomizing nozzle. The atomizing nozzle is located in the atomization chamber. A screw extrusion vertical channel is formed at the axis of the liquid storage chamber. One end of the atomizing pipe close to the liquid inlet pipe is installed with a first valve. After passing through the first valve, the atomizing pipe is divided into two branches, and each branch is installed with the atomizing nozzle. One of the atomizing nozzles sprays vertically upward, and the other atomizing nozzle sprays horizontally. The liquid outlet pipe close to the first high-pressure pump is communicated with a stock solution pipe. A second valve is installed on the stock solution pipe. A first medium is formed in the heating chamber. The first medium is discharged into a compressor through a first pipeline. After the compressor heats the first medium, it is discharged into the heating chamber through a second pipeline for heating the liquid in the vertical flow channels. The cold energy generated by the compressor cools the vacuum pump through a second medium in a third pipeline. After the second medium cools the vacuum pump, it acts on a heat exchanger through a fourth pipeline. After the second medium cools the steam in the heat exchanger, it flows back to the compressor through a fifth pipeline. The steam in the atomization chamber is discharged into the heat exchanger through a sixth pipeline formed at its top, and after cooling, it is discharged into the bottom of a first tank through a seventh pipeline. A liquid storage is formed at the bottom of the first tank. The height of the liquid storage is higher than the bottom of the seventh pipeline. The vacuum pump evacuates the air from the first tank near the top through an extraction pipe. An overflow pipeline is formed on one side of the first tank. The height of the overflow pipeline is higher than the height of the seventh pipeline. The overflow pipeline is communicated with the top of a condensate water tank. The bottom of the condensate water tank is discharged after being connected to a second high-pressure pump through a pipeline.

2. The cold and hot evaporation unit for low-temperature distillation according to claim 1, characterized in that, A downward pressing scraper that moves vertically is formed at the top of the screw extrusion vertical channel. The bottom of the screw extrusion vertical channel is transported through a screw extrusion horizontal channel and then output through a sludge discharge pipe. A drain pipe is formed at one end of the screw extrusion horizontal channel close to the sludge discharge pipe. A filter element is provided on the drain pipe.

3. The cold and hot evaporation unit for low-temperature distillation according to claim 1, characterized in that, The steam extracted by the vacuum pump flows through an exhaust pipe to a sandwich heating chamber formed outside the kettle body. A first coil is formed inside the atomization chamber. One end of the first coil is communicated with the sandwich heating chamber, and the other end extends out of the kettle body in a sealed manner.

4. The cold and hot evaporation unit for low-temperature distillation according to claim 1, wherein A second coil is formed in the middle of the third pipeline. The second coil is located inside the condensate water tank.

5. The cold and hot evaporation unit for low-temperature distillation according to claim 1, characterized in that, The condensate water tank is provided with an inspection opening and an exhaust valve is formed at the top.

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