Novel household garbage leachate low-pressure evaporation device

Abstract

The utility model discloses a novel low-pressure evaporation device for household garbage leachate, which relates to the technical field of leachate treatment and comprises a circulating pump III for conveying concentrated liquor into a triple-effect heater and / or a material transfer pump II, a liquid outlet end of the triple-effect heater is connected with a side port of the triple-effect evaporation chamber, and a bottom port of the triple-effect evaporation chamber is connected with the circulating pump III and the preheater; the liquid inlet of the circulating pump II used for conveying the concentrated liquid to the material transfer pump I and / or the second-effect heater is connected with the liquid outlet ends of the second-effect evaporation chamber and the material transfer pump II, and the liquid outlet end of the second-effect heater is connected with the side port of the second-effect evaporation chamber; according to the device, pretreated concentrated liquor is evaporated, generated steam condensed cold water is recycled to the circulating water tank after being cooled, and evaporated and concentrated mother liquor enters the concentrated liquor back-spraying tank for back-spraying incineration, so that the aims of effectively reducing the concentrated liquor and effectively incinerating the concentrated liquor are fulfilled.

Description

Technical Field

[0001] This utility model specifically relates to the field of leachate treatment technology, and more specifically to a novel low-pressure evaporation device for concentrated leachate after treatment of municipal solid waste. Background Technology

[0002] Leachate concentrate contains high concentrations of pollutants, making direct treatment difficult. Concentration concentrates these pollutants, facilitating more targeted subsequent treatment methods such as advanced oxidation and incineration. For example, after evaporation and concentration, the concentrations of organic matter and salts in the concentrate increase; incineration at this point can more thoroughly remove pollutants, improving treatment efficiency and effectiveness.

[0003] Concentration can significantly reduce the volume of landfill leachate concentrate. For example, evaporation or membrane technologies can be used to separate most of the water, thereby reducing the amount of water needed for subsequent treatment, and decreasing the size and cost of treatment equipment.

[0004] Chinese Patent Publication No. CN221692896U discloses a landfill leachate concentration device, comprising: a housing, a blower, an atomizer, a filter plate, a liquid inlet, a circulation tank, and an exhaust port. The device thoroughly concentrates the landfill leachate by: the liquid inlet delivers the leachate to the atomizer, which disperses and atomizes the leachate; the blower blows the atomized leachate to the filter plate to separate the water; the humid air formed by the separated water is discharged through the exhaust port; and the leachate after water separation flows into the circulation tank, which then transports the leachate back to the liquid inlet for circulating filtration, thus completing the thorough concentration of the landfill leachate.

[0005] The leachate concentration device in the aforementioned patent disperses the leachate through an atomizer and then separates the water through a filter plate. This concentration effect is poor and it is not suitable for use in large-scale waste treatment plants. Utility Model Content

[0006] The purpose of this invention is to provide a novel low-pressure evaporation device for municipal solid waste leachate, which evaporates the pretreated concentrated liquid, and the resulting steam condensate is cooled and reused in a circulating water tank. The concentrated mother liquor is then injected back into the concentrated liquid return spray tank for incineration, thereby achieving the purpose of effectively reducing the volume of concentrated liquid and effectively incinerating it; thus solving the technical problems mentioned in the background art.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] A novel low-pressure evaporation device for municipal solid waste leachate includes a circulation pump three that transports concentrated liquid to a triple-effect heater and / or a transfer pump two; the liquid outlet of the triple-effect heater is connected to the side port of the triple-effect evaporation chamber, and the bottom port of the triple-effect evaporation chamber is connected to the circulation pump three and the preheater.

[0009] The second circulating pump delivers the concentrated liquid to the first transfer pump and / or the second-effect heater. The inlet of the second circulating pump is connected to the second-effect evaporation chamber and the outlet of the second transfer pump, wherein the outlet of the second-effect heater is connected to the side port of the second-effect evaporation chamber.

[0010] The inlet of the first circulating pump is connected to the first-effect evaporation chamber and the outlet of the first transfer pump; the outlet of the first-effect heater is connected to the first-effect evaporation chamber through a pipeline.

[0011] The top outlet of the first-effect evaporator is connected to the inlet of the second-effect heater via a pipe; the top outlet of the second-effect evaporator is connected to the inlet of the third-effect heater via a pipe.

[0012] As a further technical solution of this utility model, the air inlet of the first-effect heater is connected to a steam source through a pipe, and the air outlet of the first-effect heater is connected to the air inlet of the preheater through a pipe; the liquid inlet of the preheater is connected to a feed pump through a pipe.

[0013] As a further technical solution of this utility model, the first-effect evaporation chamber is connected to the inlet and outlet of the discharge pump through two pipes respectively, wherein the connection point between the pipe connecting the outlet of the discharge pump and the first-effect evaporation chamber is higher than the connection point between the pipe connecting the inlet of the discharge pump and the first-effect evaporation chamber.

[0014] As a further technical solution of this utility model, the pipe connecting the inlet end of the discharge pump to the single-effect evaporation chamber is connected to a pipe leading to the crystallization tank via a tee.

[0015] As a further technical solution of this utility model, the crystallization tank is a jacketed tank, and the jacket of the crystallization tank is connected to the cooling water pipe; the discharge end of the crystallization tank is connected to the mother liquor tank through a pipe.

[0016] As a further technical solution of this utility model, a gas-liquid separator is connected between the double-effect heater and the triple-effect heater; a gas-liquid separator is connected between the triple-effect heater and the condenser; a condensate tank is connected to the bottom of the condenser, and the condensate tank is also connected to a condensate pump.

[0017] As a further technical solution of this utility model, the condenser and the vacuum pump are connected by a pipeline.

[0018] Compared with the prior art, the beneficial effects of this utility model are:

[0019] 1. This utility model evaporates the pretreated concentrated liquid, and the resulting steam condensate is cooled and reused in the circulating water tank. The concentrated mother liquor is then injected back into the concentrated liquid return spray tank for incineration, so as to achieve the purpose of effectively reducing the volume of concentrated liquid and effectively incinerating and disposing of it.

[0020] 2. In this invention, the evaporator primarily uses steam to provide heat energy. After being filtered through a sand filter, the concentrated liquid directly enters the preheater. In the preheater, steam initially preheats the concentrated liquid. The preheated steam then re-enters the first-effect heating chamber to further heat and evaporate the concentrated liquid there. The preheated concentrated liquid then sequentially enters the third-effect, second-effect, and first-effect heating chambers and the evaporation chamber for counter-current evaporation. The steam generated in the first-effect evaporation chamber provides heat to the second-effect heating chamber, and the steam from the second-effect evaporation chamber provides heat to the third-effect heating chamber, forming a co-current energy supply. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of this utility model.

[0022] In the diagram: 1-Single-effect heater, 2-Double-effect heater, 3-Triple-effect heater, 4-Condenser, 5-Preheater, 6-Single-effect evaporation chamber, 7-Double-effect evaporation chamber, 8-Triple-effect evaporation chamber, 9-Condensate tank, 10-Mother liquor tank, 11-Crystallization tank, 12-Gas-liquid separator one, 13-Gas-liquid separator two, 14-Circulation pump one, 15-Circulation pump two, 16-Circulation pump three, 17-Transfer pump one, 18-Transfer pump two, 19-Vacuum pump, 20-Condensate pump, 21-Feed pump, 22-Mother liquor return pump, 23-Discharge pump. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Please see Figure 1 In this embodiment of the utility model, a novel low-pressure evaporation device for leachate from municipal solid waste includes a circulation pump 16 that transports concentrated liquid to a triple-effect heater 3 and / or a transfer pump 2 18; the liquid outlet of the triple-effect heater 3 is connected to the side port of the triple-effect evaporation chamber 8, and the bottom port of the triple-effect evaporation chamber 8 is connected to the circulation pump 3 16 and the preheater 5.

[0025] The circulation pump 2 15 delivers the concentrated liquid to the transfer pump 1 17 and / or the double-effect heater 2. The inlet of the circulation pump 2 15 is connected to the outlet of the double-effect evaporation chamber 7 and the transfer pump 2 18, wherein the outlet of the double-effect heater 2 is connected to the side port of the double-effect evaporation chamber 7.

[0026] The circulation pump 14 delivers the concentrated liquid to the first-effect heater 1. The inlet of the circulation pump 14 is connected to the first-effect evaporation chamber 6 and the outlet of the transfer pump 17. The outlet of the first-effect heater 1 is connected to the first-effect evaporation chamber 6 through a pipeline.

[0027] The top outlet of the first-effect evaporator 6 is connected to the inlet of the second-effect heater 2 via a pipe; the top outlet of the second-effect evaporator 7 is connected to the inlet of the third-effect heater 3 via a pipe.

[0028] More specifically, the air inlet of the single-effect heater 1 is connected to a steam source via a pipe, and the air outlet of the single-effect heater 1 is connected to the air inlet of the preheater 5 via a pipe; the liquid inlet of the preheater 5 is connected to the feed pump 21 via a pipe.

[0029] By adopting the above technical solution, the landfill leachate (i.e., concentrated liquid, hereinafter referred to as concentrated liquid) is transported to the preheater 5 for preheating by the feed pump 21, and then transported to the triple-effect evaporator 8 for storage. When the liquid level in the triple-effect evaporator 8 reaches the set value, the circulation pump 3 16 is turned on to transport the concentrated liquid to the triple-effect heater 3 for heating treatment. As the liquid level of the concentrated liquid continues to increase, the concentrated liquid will overflow into the triple-effect evaporator 8 through the outlet of the triple-effect heater 3. With the continuous operation of the circulation pump 3 16, an internal circulation will be formed, which will accelerate the temperature of the triple-effect heater 3 and the triple-effect evaporator 8 and achieve the initial evaporation.

[0030] When the amount of concentrated liquid in the triple-effect heater 3 and triple-effect evaporator 8 increases, the transfer pump 2 18 is turned on and the concentrated liquid is transported to the second-effect evaporator 7 for temporary storage. When the liquid level in the second-effect evaporator 7 reaches the set value, the circulation pump 2 15 is turned on and the concentrated liquid in the second-effect evaporator 7 is transported to the second-effect heater 2 for heating. When the concentrated liquid in the second-effect heater 2 reaches a certain level, it will overflow into the second-effect evaporator 7, thus forming an internal circulation and improving the evaporation of the concentrated liquid in the second-effect evaporator 7.

[0031] When the concentrated liquid in the second-effect evaporator 7 and the second-effect heater 2 reaches the set value, the transfer pump 17 is turned on, and the transfer pump 17 transports the concentrated liquid to the first-effect evaporator 6 for temporary storage. When the liquid level in the first-effect evaporator 6 reaches the set value, the circulation pump 14 is turned on, and the concentrated liquid is transported to the first-effect heater 1 for final heating treatment. After the first-effect heater 1 is full, it overflows into the first-effect evaporator 6, realizing internal circulation again. This is conducive to the full evaporation of the concentrated liquid, thereby realizing the concentration treatment of the concentrated liquid.

[0032] The concentrated liquid can be directly injected into the combustion furnace for combustion treatment.

[0033] In this embodiment, the first-effect evaporation chamber 6 is connected to the inlet and outlet of the discharge pump 23 by two pipes respectively. The connection point between the pipe connecting the outlet of the discharge pump 23 and the first-effect evaporation chamber 6 is higher than the connection point between the pipe connecting the inlet of the discharge pump 23 and the first-effect evaporation chamber 6.

[0034] More specifically, the pipe connecting the first-effect evaporation chamber 6 to the inlet end of the discharge pump 23 is connected to a pipe leading to the crystallization tank 11 via a tee.

[0035] The crystallization tank 11 is a jacketed tank, and the jacket of the crystallization tank 11 is connected to the cooling water pipe; the discharge end of the crystallization tank 11 is connected to the mother liquor tank 10 through a pipe.

[0036] When the concentrate needs to be crystallized, after the concentrate is fully concentrated, it can be transported to the crystallization tank 11 by the discharge pump 23. After cooling water is introduced into the crystallization tank 11, the concentrate in the crystallization tank 11 can be crystallized. The crystallized concentrate is transported to the mother liquor tank 10. Finally, it is recycled and crystallized by the mother liquor return pump 22.

[0037] As a further explanation of the above embodiment, the first-effect heater 1 is directly connected to high-temperature steam. When the concentrated liquid enters the first-effect heater 1, the concentrated liquid reaches the highest temperature and the evaporation effect is the best, thus further realizing the concentration treatment of the concentrated liquid.

[0038] The concentrated liquid heated by the first-effect heater 1 has a high temperature. After the concentrated liquid overflows into the first-effect evaporation chamber 6, it will generate steam. The steam is transported through the pipeline to the second-effect heater 2 to heat the concentrated liquid circulating in the inner circuit. The concentrated liquid heated by the second-effect heater 2 overflows into the second-effect evaporation chamber 7. The steam generated by the concentrated liquid in the second-effect evaporation chamber 7 is transported to the third-effect heater 3 to heat the concentrated liquid circulating in the third-effect heater 3.

[0039] The concentrated liquid heated by the triple-effect heater 3 overflows into the triple-effect evaporation chamber 8, and the preheated concentrated liquid undergoes initial evaporation in the triple-effect evaporation chamber 8.

[0040] The triple-effect evaporator 8 is also connected to the condenser 4 via a pipe; the condenser 4 is connected to the vacuum pump 19 via a pipe.

[0041] Vacuum pump 19 will evacuate condenser 4, thus the vapor in triple-effect evaporator 8 will be extracted. Under vacuum conditions, the boiling point of the concentrated liquid in triple-effect evaporator 8 will be lowered, thereby enabling rapid evaporation of the concentrated liquid in triple-effect evaporator 8.

[0042] In this embodiment, a gas-liquid separator 12 is connected between the double-effect heater 2 and the triple-effect heater 3; a gas-liquid separator 13 is connected between the triple-effect heater 3 and the condenser 4; a condensate tank 9 is connected to the bottom of the condenser 4, and the condensate tank 9 is also connected to the condensate pump 20.

[0043] The steam in the double-effect heater 2 is separated by the gas-liquid separator 12 and then enters the triple-effect heater 3. The steam in the triple-effect heater 3 is separated by the gas-liquid separator 13 and then enters the condenser 4. Finally, the collected condensate is discharged into the condensate tank 9 for storage and then discharged by the condensate pump 20.

[0044] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0045] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style of the specification is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A novel low-pressure evaporation device for municipal solid waste leachate, characterized in that: This includes a circulation pump three (16) that delivers concentrated liquid to the triple-effect heater (3) and / or the transfer pump two (18); the liquid outlet of the triple-effect heater (3) is connected to the side port of the triple-effect evaporation chamber (8), and the bottom port of the triple-effect evaporation chamber (8) is connected to the circulation pump three (16) and the preheater (5). The inlet of the second circulation pump (15) is connected to the outlet of the second circulation pump (17) and / or the second-effect heater (2), which delivers the concentrated liquid to the first transfer pump (17) and / or the second-effect heater (2). The outlet of the second-effect heater (2) is connected to the side port of the second-effect evaporation chamber (7). The inlet of the circulating pump (14) is connected to the outlet of the first-effect evaporation chamber (6) and the discharge end of the transfer pump (17) in the first-effect heater (1); the outlet end of the first-effect heater (1) is connected to the first-effect evaporation chamber (6) through a pipe. The top outlet of the first-effect evaporator (6) is connected to the inlet of the second-effect heater (2) via a pipe; the top outlet of the second-effect evaporator (7) is connected to the inlet of the third-effect heater (3) via a pipe.

2. The novel low-pressure evaporation device for municipal solid waste leachate according to claim 1, characterized in that: The air inlet of the single-effect heater (1) is connected to a steam source through a pipe, and the air outlet of the single-effect heater (1) is connected to the air inlet of the preheater (5) through a pipe; the liquid inlet of the preheater (5) is connected to the feed pump (21) through a pipe.

3. The novel low-pressure evaporation device for municipal solid waste leachate according to claim 1, characterized in that: The first-effect evaporation chamber (6) is connected to the inlet and outlet of the discharge pump (23) by two pipes respectively. The connection point between the pipe connecting the outlet of the discharge pump (23) and the first-effect evaporation chamber (6) is higher than the connection point between the pipe connecting the inlet of the discharge pump (23) and the first-effect evaporation chamber (6).

4. The novel low-pressure evaporation device for municipal solid waste leachate according to claim 3, characterized in that: The pipe connecting the first-effect evaporation chamber (6) to the inlet of the discharge pump (23) is connected to a pipe leading to the crystallization tank (11) via a tee.

5. The novel low-pressure evaporation device for municipal solid waste leachate according to claim 4, characterized in that: The crystallization tank (11) is a jacketed tank, and the jacket of the crystallization tank (11) is connected to the cooling water pipe; the discharge end of the crystallization tank (11) is connected to the mother liquor tank (10) through a pipe.

6. The novel low-pressure evaporation device for municipal solid waste leachate according to claim 1, characterized in that: A gas-liquid separator (12) is connected between the two-effect heater (2) and the three-effect heater (3); a gas-liquid separator (13) is connected between the three-effect heater (3) and the condenser (4); a condensate tank (9) is connected to the bottom of the condenser (4), and the condensate tank (9) is also connected to the condensate pump (20).

7. The novel low-pressure evaporation device for municipal solid waste leachate according to claim 6, characterized in that: The condenser (4) and the vacuum pump (19) are connected by a pipe.

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