Multi-effect evaporation non-condensable gas discharging system

Abstract

The utility model discloses a multi-effect evaporation non-condensable gas discharging system which comprises at least three evaporation units connected in series. The evaporation unit comprises a heat exchanger, a separator and a circulating pump, an air inlet pipe is arranged on a shell layer of the heat exchanger, the top of the heat exchanger is connected with the separator through a pipeline, the bottom of the separator is connected with the bottom of the heat exchanger through a pipeline and the circulating pump, and an air outlet pipe is further arranged on the shell layer of the heat exchanger. The top of the separator is connected with a gas outlet pipe through a pipeline, and the gas outlet pipe is used for being connected with a gas inlet pipe on the next evaporation unit; according to the evaporation unit, the defects in the prior art are overcome, and the purposes of improving the heat exchange rate of the system and reducing invalid steam discharged by non-condensable gas are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of multiple-effect evaporation, in particular to a multiple-effect evaporation non-condensable gas discharge system. Background Art

[0002] With the rapid development of pharmaceutical companies, the discharge of pharmaceutical and chemical wastewater has increased. Furthermore, pharmaceutical and chemical wastewater is characterized by high salinity, difficulty in degradation, and complex composition, making it challenging to treat. Multi-effect evaporation is a commonly used method for treating pharmaceutical and chemical wastewater. It effectively removes salt from wastewater, allowing it to flow directly into biochemical tanks for biochemical treatment. Multi-effect evaporation primarily utilizes raw steam in the first effect and heat from secondary steam in the remaining effects, reducing production costs and improving economic benefits for the company. However, due to the continuous discharge of non-condensable gases from the heating chambers of each effect during the evaporation process, a considerable amount of heat in the discharged non-condensable gases is wasted, increasing steam consumption. Utility Model Content

[0003] The purpose of the utility model is to provide a multi-effect evaporation non-condensable gas discharge system, which overcomes the shortcomings of the prior art, fully utilizes the heat of the evaporation system, and saves fresh steam.

[0004] In order to solve the above problems, the technical solutions adopted by the present invention are as follows:

[0005] A multi-effect evaporation non-condensable gas emission system comprises at least three evaporation units connected in series;

[0006] The evaporation unit includes a heat exchanger, a separator, and a circulation pump. The shell of the heat exchanger is provided with an air inlet pipe. The top of the heat exchanger is connected to the separator through a pipe. The bottom of the separator is connected to the bottom of the heat exchanger through a pipe and a circulation pump. The shell of the heat exchanger is also provided with an air outlet pipe. The top of the separator is connected to the air outlet pipe through a pipe. The air outlet pipe is used to connect to the air inlet pipe of the next evaporation unit.

[0007] A vacuum pump is also provided on the outlet pipe of the heat exchanger of the evaporation unit at the end, and the top of the separator of the evaporation unit at the end is emptied.

[0008] Furthermore, the heat exchanger is a double-tube circulation heat exchanger.

[0009] Compared with the prior art, the implementation effects of the present invention are as follows: the multi-effect evaporation non-condensable gas emission system achieves the purpose of improving the system heat exchange rate and reducing the invalid steam emitted by non-condensable gas by changing the process route, thereby achieving the effect of saving fresh steam. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a schematic structural diagram of the utility model.

[0011] Explanation of the accompanying symbols: E01, single-effect heat exchanger; E02, double-effect heat exchanger; E03, triple-effect heat exchanger; S01, single-effect separator; S02, double-effect separator; S03, triple-effect separator; P01, single-effect circulation pump; P02, double-effect circulation; P03, triple-effect circulation pump; P04, vacuum pump. DETAILED DESCRIPTION

[0012] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0013] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They 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 direction and be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0014] In the description of this utility model, it should be noted that, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections; and they may refer to direct connections or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of these terms in this utility model based on the specific circumstances.

[0015] like Figure 1 As shown, the multi-effect evaporation non-condensable gas discharge system of the present invention includes a first evaporation unit, a second evaporation unit and a third evaporation unit connected in series.

[0016] The first evaporation unit includes a single-effect heat exchanger E01, a single-effect separator S01 and a single-effect circulation pump P01. An air inlet pipe is provided on the shell of the single-effect heat exchanger E01. The top of the single-effect heat exchanger E01 is connected to the single-effect separator S01 through a pipeline. The bottom of the single-effect separator S01 is connected to the bottom of the single-effect heat exchanger E01 through a pipeline and the single-effect circulation pump P01. An air outlet pipe is also provided on the shell of the single-effect heat exchanger E01. The top of the single-effect separator S01 is connected to the air outlet pipe through a pipeline.

[0017] The second evaporation unit includes a second-effect heat exchanger E02, a second-effect separator S02 and a second-effect circulation P02 pump. The shell of the second-effect heat exchanger E02 is provided with an air inlet pipe connected to the air outlet pipe of the first-effect heat exchanger E01. The top of the second-effect heat exchanger E02 is connected to the second-effect separator S02 through a pipeline. The bottom of the second-effect separator S02 is connected to the bottom of the second-effect heat exchanger E02 through a pipeline and the second-effect circulation P02 pump. An air outlet pipe is also provided on the shell of the second-effect heat exchanger E02, and the top of the second-effect separator S02 is connected to the air outlet pipe through a pipeline.

[0018] The third evaporation unit includes a triple-effect heat exchanger E03, a triple-effect separator S03 and a triple-effect circulation pump P03. An air inlet pipe connected to the air outlet pipe of the first-effect heat exchanger E01 is provided on the shell of the triple-effect heat exchanger E03. The top of the triple-effect heat exchanger E03 is connected to the triple-effect separator S03 through a pipeline. The bottom of the triple-effect separator S03 is connected to the bottom of the triple-effect heat exchanger E03 through a pipeline and the triple-effect circulation pump P03. The top of the triple-effect separator S03 is emptied. An air outlet pipe is also provided on the shell of the triple-effect heat exchanger E03. A vacuum pump P04 is also provided on the air outlet pipe of the triple-effect heat exchanger E03. The vacuum pump P04 is used to discharge non-condensable gas.

[0019] When the multi-effect evaporation non-condensable gas emission system is in use, the raw steam enters the shell of the first-effect heat exchanger E01 from the air inlet pipe, exchanges heat with the chemical wastewater that enters the heat exchanger through the first-effect circulation pump P01, flows out of the first-effect heat exchanger E01, and enters the shell of the second-effect heat exchanger E02. After the chemical wastewater that has been sent to the first-effect heat exchanger E01 by the first-effect circulation pump P01 for heat exchange enters the first-effect separator S01, the steam generated in the first-effect separator S01 also enters the shell of the second-effect heat exchanger E02 and exchanges heat with the second-effect heat exchanger E02. The chemical wastewater in the second-effect heat exchanger E02 is heat exchanged, so that all the waste heat generated by the first evaporation unit can enter the second evaporation unit, effectively reducing the heat loss; and the steam entering the second evaporation unit from the first evaporation unit passes through the second-effect heat exchanger E02, the second-effect circulation P02 pump and the second-effect separator S02 after heat exchange (the heat exchange path is the same as the first evaporation unit, that is, the second-effect circulation P02 pump sends the chemical wastewater in the second-effect separator S02 to the second-effect heat exchanger E02 for heat exchange). After heat exchange, the steam generated by the second-effect separator S02 is sent to the third evaporation unit, and the steam after heat exchange in the second-effect heat exchanger E02 also enters the third evaporation unit), entering the third evaporation unit, so that all the waste heat generated by the second evaporation unit can enter the third evaporation unit; the steam entering the third evaporation unit through the second evaporation unit passes through the triple-effect heat exchanger E03, the triple-effect circulation pump P03 and the triple-effect separator S03 for heat exchange, and the remaining steam generated by the triple-effect heat exchanger E03 is extracted from the vacuum pump P04, and the triple-effect circulation pump P03 continuously circulates the chemical wastewater in the triple-effect separator S03. Since the temperature of the chemical wastewater in the triple-effect separator S03 is not high at this time, basically no steam is generated, so the top of the triple-effect separator S03 can be directly emptied and connected to the external atmosphere; therefore, the utility model effectively realizes the utilization of the heat of the raw steam through the first evaporation unit, the second evaporation unit and the third evaporation unit connected in series, avoids heat waste, reduces energy consumption and saves resources.

[0020] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A multi-effect evaporation non-condensable gas emission system, characterized by: comprising at least three evaporation units connected in series; The evaporation unit includes a heat exchanger, a separator, and a circulation pump. The shell of the heat exchanger is provided with an air inlet pipe. The top of the heat exchanger is connected to the separator through a pipe. The bottom of the separator is connected to the bottom of the heat exchanger through a pipe and a circulation pump. The shell of the heat exchanger is also provided with an air outlet pipe. The top of the separator is connected to the air outlet pipe through a pipe. The air outlet pipe is used to connect to the air inlet pipe of the next evaporation unit. A vacuum pump is also provided on the outlet pipe of the heat exchanger of the evaporation unit at the end, and the top of the separator of the evaporation unit at the end is emptied.

2. The multi-effect evaporation non-condensable gas exhaust system according to claim 1, characterized in that: The heat exchanger is a double-tube circulation heat exchanger.

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