CN115646998A - Wet garbage water thermal recycling treatment system and method - Google Patents

Abstract

The invention relates to a wet garbage water thermal recycling treatment system and a method thereof in the technical field of organic waste treatment, wherein the wet garbage water thermal recycling treatment system comprises a slurry mixing tank, a screw pump, a centrifugal machine, a liquid storage tank and a primary treatment subsystem; the primary treatment subsystem comprises a first reaction kettle, a first flash separator, a second reaction kettle and a heater, wherein the first reaction kettle is communicated with the second reaction kettle through the first flash separator, the heater is used for heating the first reaction kettle and the second reaction kettle respectively, the screw pump is used for pumping wet garbage in the slurry mixing tank into the first reaction kettle and the second reaction kettle respectively, the centrifuge receives materials in the first reaction kettle and the second reaction kettle and separates the materials into liquid materials and solid materials, the liquid materials are conveyed into the liquid storage tank, and the solid materials are conveyed to external equipment. According to the invention, energy recovery is carried out by adopting a flash evaporation switching mode, so that the energy utilization rate is improved, the heating time is shortened, and the problem of high energy consumption of the device in the prior art is solved.

Description

Wet garbage water thermal recycling treatment system and method

Technical Field

The invention relates to the technical field of organic waste treatment, in particular to a wet garbage hydrothermal recycling treatment system and a method thereof.

Background

At present, wet garbage is mainly processed into organic fertilizer, is buried, is fermented to generate methane, is subjected to incineration treatment and the like, wherein pollutants such as garbage leachate, methane generated by garbage piles and the like are difficult to be led out, collected and treated by the landfill treatment, so that not only is the surrounding environment seriously polluted, but also potential safety hazards exist, and the image of a town is seriously influenced; and the waste incineration treatment easily generates toxic gases such as dioxin and the like, pollutes air and generates peculiar smell, and seriously influences the surrounding environment.

The technology for treating the household garbage by using the hydrothermal method is very suitable for treating the municipal household garbage, and is a garbage treatment technology which is rapid, efficient and environment-friendly. Hydrothermal oxidation (hydro-thermal oxidation-HTO) is a very effective chemical oxidation technique, and is particularly suitable for the treatment of toxic and organic wastes. The hydrothermal method is a method of oxidizing and decomposing organic substances or reducing inorganic substances dissolved and suspended in garbage in an aqueous phase with air or other oxidants at high temperature and high pressure to remove COD (chemical oxygen demand), BOD (biochemical oxygen demand), SS (sulfide) and the like to a large extent. It is characteristic of such processes that the reaction is carried out in the hot water phase.

In the process of implementing the invention, the inventor finds that at least the following problems exist in the prior art: high energy consumption and insufficient reduction. For example, publication No. CN108380636A discloses a continuous pilot plant for treating domestic garbage by a hydrothermal method, which comprises an engine, a raw material barrel, a slurry pump, a preheater, an oxidant pump, an oxidant storage tank, a filter, a solid-liquid separator, a cooler, a reactor, and a control connection mechanism. The device has the problems of high energy consumption and no reduction.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a system and a method for hydrothermal recycling of wet garbage.

The invention provides a wet garbage water thermal recycling treatment system, which comprises a slurry mixing tank, a screw pump, a centrifugal machine, a liquid storage tank and a primary treatment subsystem;

the primary treatment subsystem comprises a first reaction kettle, a first flash separator, a second reaction kettle and a heater, the first reaction kettle is communicated with the second reaction kettle through the first flash separator, the heater is used for heating the first reaction kettle and the second reaction kettle respectively, the slurry mixing tank is used for storing wet garbage after sorting, crushing, pulping and emulsifying, the screw pump is used for pumping the wet garbage in the slurry mixing tank into the first reaction kettle and the second reaction kettle respectively, the centrifuge receives materials in the first reaction kettle and the second reaction kettle and separates the materials into liquid materials and solid materials, the liquid materials are conveyed into the liquid storage tank, and the solid materials are conveyed to external equipment;

when the first reaction kettle is heated and pressurized and kept for a preset time under a constant temperature and pressure state, the slurry mixing pipe conveys the wet garbage into the second reaction kettle through the screw pump, and heat energy is conveyed into the second reaction kettle through the first flash separator before the first reaction kettle discharges the materials, so that the wet garbage in the second reaction kettle is preheated; when the second reaction kettle is heated and pressurized and kept for a preset time under a constant temperature and pressure state, the slurry mixing tank pumps the wet garbage into the first reaction kettle with the emptied materials through the screw pump, heat energy is conveyed into the first reaction kettle through the first flash separator before the second reaction kettle discharges the materials, and the wet garbage in the second reaction kettle is preheated and circulated in sequence.

In some embodiments, the primary treatment subsystem further comprises a feed surge tank in communication with the first flash separator, the feed surge tank for maintaining a pressure and temperature balance between the first reaction vessel and the second reaction vessel.

In some embodiments, the outer peripheral surface of the slurry mixing tank is provided with a heat preservation cavity, the feeding balance tank is communicated with the heat preservation cavity, and steam in the feeding balance tank is introduced into the heat preservation cavity to heat the slurry mixing tank.

In some embodiments, the system further comprises an oil-water separator, wherein the liquid material in the liquid storage tank enters the oil-water separator and is separated into water and liquid fertilizer, and the liquid fertilizer is sent to the next-stage treatment subsystem.

In some embodiments, the secondary treatment subsystem comprises a second flash separator, a steam compressor and a heat exchanger, the second flash separator is communicated with the oil-water separator and receives the conveyed liquid fertilizer, the second flash separator conveys steam into the heat exchanger through the steam compressor, condensed water discharged by the heat exchanger enters an external water tank, and the second flash separator and the concentrated liquid fertilizer discharged by the heat exchanger are discharged to external equipment.

In some embodiments, the second flash separator is in communication with the holding chamber, and excess steam in the holding chamber enters the second flash separator.

In some embodiments, the secondary processing subsystem further comprises a third flash separator, an inlet of the third flash separator being in communication with the second flash separator, and an outlet of the third flash separator being in communication with the vapor compressor.

The invention also provides a wet garbage water heat recycling treatment method, which adopts the wet garbage water heat recycling treatment system and comprises a flash evaporation switching step and a multi-stage distillation step;

the flash switching step comprises:

a1, pumping sorted, crushed, pulped and emulsified wet garbage into a size mixing tank through an emulsification pump;

a2, pumping the wet garbage in the size mixing tank into the first reaction kettle through the screw pump;

a3, starting the heater to heat the first reaction kettle, simultaneously sending air into the first reaction kettle through an air compressor to pressurize, and keeping the first reaction kettle at a preset temperature and a preset pressure for a preset time;

a4, pumping the wet garbage in the size mixing tank into the second reaction kettle through the screw pump while the step A3 is carried out;

a5, after the first reaction kettle is kept at constant temperature and constant pressure for a preset time, opening valves of the first flash separator, the first reaction kettle and the second reaction kettle respectively, transferring heat energy in the first reaction kettle into the second reaction kettle through flash evaporation of the first flash separator, and heating wet garbage in the second reaction kettle;

a6, after the temperature and the pressure in the first reaction kettle are reduced to preset values, opening a discharge valve of the first reaction kettle, conveying the material in the first reaction kettle into the centrifugal machine, separating the material into a liquid material and a solid material through the centrifugal machine, conveying the liquid material into the liquid storage tank, and conveying the solid material to external equipment;

a7, heating the second reaction kettle by the heater, and simultaneously feeding air into the second reaction kettle by an air compressor for pressurization, wherein the second reaction kettle is kept at a preset temperature and a preset pressure for a preset time;

a8, pumping the wet garbage in the size mixing tank into the first reaction kettle through the screw pump while the step A7 is carried out;

a9, after the second reaction kettle is kept at constant temperature and constant pressure for a preset time, opening the first flash separator, the first reaction kettle and a valve of the second reaction kettle, and transferring the heat energy in the second reaction kettle to the first reaction kettle through the first flash separator in a flash manner to heat the wet garbage in the first reaction kettle;

a10, after the temperature and the pressure in the second reaction kettle are reduced to preset values, opening a discharge valve of the second reaction kettle, conveying the material in the second reaction kettle into the centrifugal machine, separating the material into a liquid material and a solid material through the centrifugal machine, conveying the liquid material into the liquid storage tank, and conveying the solid material to external equipment; and A11, repeating the steps A1-A10.

The multistage distillation step comprises:

b1, conveying the liquid material in the liquid storage tank into an oil-water separator, separating the liquid material into water and liquid fertilizer through the oil-water separator, and conveying the liquid fertilizer into the second flash separator for flash separation;

b2, carrying out flash evaporation separation by the second flash evaporation separator to form steam and concentrated liquid fertilizer, wherein the steam is sent into the heat exchanger by the steam compressor, and the concentrated liquid fertilizer is discharged from a discharge outlet of the second flash evaporation separator to external equipment;

and B3, the heat exchanger converts the steam into condensed water and concentrated liquid fertilizer through heat exchange, the condensed water is discharged into an external water tank, and the concentrated liquid fertilizer is conveyed into external equipment.

In some embodiments, the step A5 and/or the step A9 further comprises a temperature and pressure balancing step, wherein the temperature and pressure balancing step comprises: the first flash separator and the feeding balancing tank are in steam transmission, so that the first reaction kettle and the second reaction kettle are kept in balance of temperature and pressure during feeding.

In some embodiments, step B2 further comprises a steam redistillation step, wherein the steam redistillation step comprises: and after the steam generated in the feeding balancing tank is introduced into the heat preservation cavity of the size mixing tank to preheat the size mixing tank, the redundant steam is introduced into the second flash separator through a pipeline to carry out distillation.

Compared with the prior art, the invention has the following beneficial effects:

1. according to the invention, energy recovery is carried out by adopting a double-kettle periodic heating and flash evaporation switching mode, so that the energy utilization rate is improved, the heating time is shortened, and the problem of high energy consumption of the device in the prior art is solved.

2. According to the invention, by arranging the feeding balance tank, the balance of the pressure and the temperature of the first reaction kettle and the second reaction kettle can be kept while feeding, and the redundant steam can be used for heating the charging tank, so that the utilization rate of energy is further improved.

3. The invention forms a multi-effect distillation treatment system by arranging the secondary treatment subsystem, treats the liquid fertilizer generated by the hydrothermal process by the multi-effect distillation technical process, solves the problems of deoiling and desalting and achieves the effect of reduction.

Drawings

Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:

FIG. 1 is a schematic flow chart of one embodiment of the present invention;

fig. 2 is a schematic flow chart of another embodiment of the present invention.

Detailed Description

The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that it would be obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit of the invention. All falling within the scope of the present invention.

Example 1

The present embodiment provides a wet waste water thermal recycling system, as shown in fig. 1, including a slurry mixing tank 1, a screw pump 2, a centrifuge 3, a liquid storage tank 4 and a primary treatment subsystem 5, wherein the primary treatment subsystem 5 includes a first reaction vessel 51, a first flash separator 52, a second reaction vessel 53 and a heater 54.

The size mixing tank 1 is used for storing wet garbage after sorting, crushing, pulping and emulsification, and the emulsified wet garbage can be pumped into the size mixing tank 1 through an emulsification pump. The inlet of the screw pump 2 is communicated with the outlet of the size mixing tank 1, and the outlet of the screw pump 2 is respectively communicated with the inlet of the first reaction kettle 51 and the inlet of the second reaction kettle 53 through pipelines. The emulsified wet garbage in the size mixing tank 1 is pumped into the first reaction kettle 51 and the second reaction kettle 53 respectively through the screw pump 2, and the processes of pumping the wet garbage in the size mixing tank 1 into the first reaction kettle 51 and the second reaction kettle 53 by the screw pump 2 are independent and can be pumped simultaneously or respectively. The first flash separator 52 is in communication with the first reaction vessel 51 and the second reaction vessel 53 through pipes, respectively. The heat energy in the first reaction vessel 51 and the second reaction vessel 53 is transferred to each other through the first flash separator 52, that is, the heat energy in the first reaction vessel 51 is transferred to the second reaction vessel 53 through the first flash separator 52, or the heat energy in the second reaction vessel 53 is transferred to the first reaction vessel through the first flash separator 52. The heater 54 may be a heat-transfer oil electric heating furnace, and the heater 54 is used for heating the first reaction vessel 51 and the second reaction vessel 53, respectively. The centrifuge 3 may be a horizontal screw centrifuge. The inlet of the centrifuge 3 is respectively communicated with the discharge hole of the first reaction kettle 51 and the discharge hole of the second reaction kettle 53 through pipelines. The outlet of the centrifuge 3 is communicated with the liquid storage tank 4 through a pipeline. The liquid material produced by the centrifugal force of the centrifuge 3 is conveyed into the liquid storage tank 4.

The working principle of the embodiment is as follows: pumping the emulsified wet garbage into the size mixing tank 1 through an emulsification pump, firstly pumping part of the wet garbage in the size mixing tank 1 into a first reaction kettle 51 through a screw pump 2, starting a heater 54 to heat the first reaction kettle 51, simultaneously pressurizing the first reaction kettle 51 through an air compressor, stopping heating and boosting when the first reaction kettle 51 is heated and pressurized to 200 ℃ and 2.0MPa, and keeping the temperature and the pressure for about 1 hour. In the process that the first reaction kettle 51 is heated and pressurized and is kept at constant temperature and constant pressure for a preset time, the wet garbage in the size mixing tank 1 is pumped into the second reaction kettle 53 by the screw pump 2. After the wet garbage in the first reaction kettle 51 is reacted for a predetermined time under constant temperature and pressure, the first flash separator 52 and the valves of the first reaction kettle 51 and the second reaction kettle 53 are opened, the heat energy in the first reaction kettle 51 is transferred into the second reaction kettle 53 through the first flash separator 52, at this time, the wet garbage in the second reaction kettle 53 is pumped into the second reaction kettle, and then the wet garbage in the second reaction kettle 53 is preheated through the heat energy transfer. After the temperature in the first reaction vessel 51 is reduced to 115 ℃ and the pressure is reduced to normal temperature, the discharge valve of the first reaction vessel 51 is opened, and the material in the first reaction vessel 51 is sent to the centrifuge 3. The materials are separated into liquid materials and solid materials through the centrifugal acting force of the centrifugal machine 3, and the solid materials are humic acid organic fertilizers and are discharged into external equipment for additional treatment. The liquid material is discharged out of the liquid storage tank 4 through a pipeline for further treatment.

While the first reactor 51 is discharged, the heater 54 heats the second reactor 53, and the second reactor 53 is pressurized by the air compressor, and when the third reactor 53 is heated to 200 ℃ and 2MPa, the temperature and pressure rise are stopped and maintained at the temperature and pressure for about 1 hour. In the process of heating and pressurizing the third reaction vessel 53 and maintaining the third reaction vessel at a constant temperature and a constant pressure for a predetermined time, the emulsified wet refuse is pumped into the first reaction vessel 51 from which the material has been emptied by the screw pump 2. After the wet garbage in the third reaction kettle 53 is reacted for a predetermined time under constant temperature and pressure, the first flash separator 52 and the valves of the first reaction kettle 51 and the second reaction kettle 53 are opened, the heat energy in the second reaction kettle 53 is transferred into the first reaction kettle 51 through the first flash separator 52, at this time, the wet garbage in the first reaction kettle 51 is pumped into the first reaction kettle 51, and then the wet garbage in the first reaction kettle 51 is preheated through the transferred heat energy. After the temperature in the third reaction kettle 53 is reduced to 115 ℃ and the pressure is reduced to normal temperature, the discharge valve of the second reaction kettle 51 is opened, and the materials in the second reaction kettle are discharged into the centrifuge 3. Similarly, centrifuge 3 separates the material into liquid material and solid material, and in liquid material passed through the pipeline and discharged to liquid reserve tank 4, solid material was humic acid fertilizer, discharges into external equipment and handles separately.

In this embodiment, the first reaction kettle 51 and the second reaction kettle 53 adopt the above alternative heating to heat up and transfer the heat energy to the other side through the first flash separator 52 to circularly treat the wet garbage, that is, adopt the mode of double-kettle periodic heating and flash switching to carry out energy recovery, improve the energy utilization rate, shorten the heating time at the same time, and solve the problem of high energy consumption of the device in the prior art.

Further, the device also comprises an oil-water separator 6, wherein the inlet of the oil-water separator 6 is communicated with the outlet of the liquid storage tank 4. The oil-water separator 6 receives the liquid material in the liquid storage tank 4, separates the liquid material into water and liquid fertilizer, pumps the water into the water tank through the pumping mechanism for centralized biochemical treatment, and discharges the liquid fertilizer to the next-stage treatment system for further treatment.

Example 2

This embodiment 2 forms on the basis of embodiment 1, through setting up the balanced jar of feeding, not only can keep the pressure of first reation kettle and second reation kettle, the temperature is balanced when the feeding, can heat the charging bucket with unnecessary steam moreover, further improves the utilization ratio of energy. Specifically, the method comprises the following steps:

as shown in fig. 1, the primary treatment subsystem 5 further includes a feed balance tank 55, and an outlet of the first flash separator 52 is in communication with an inlet of the feed balance tank 55. Feed balance tank 55 is used to contain excess steam in first flash separator 52, and feed balance tank 55 can also supplement steam in first flash separator 52 to balance the pressure and temperature of first reaction vessel 51 and second reaction vessel 53 during feeding.

Further, a heat-retaining chamber (not shown) is provided on the outer peripheral surface of the seasoning tank 1, and the heat-retaining chamber may be formed by providing a layer of sealed heat-retaining material on the outer wall surface of the seasoning tank 1. An outlet of the feeding balance tank 55 is communicated with the heat preservation cavity, steam is conveyed into the heat preservation cavity through the feeding balance tank 55, and then the emulsified wet garbage in the seasoning tank 1 is preheated, so that the energy utilization rate is further improved, and the energy consumption is reduced.

Example 3

The embodiment 3 is formed on the basis of the embodiment 1 or 2, a multi-effect distillation treatment system is formed by arranging a secondary treatment subsystem, and the liquid fertilizer generated by the hydrothermal process is treated by the multi-effect distillation technical process, so that the problems of deoiling and desalting are solved, and the effect of reduction is achieved. Specifically, the method comprises the following steps:

as shown in fig. 1-2, the secondary processing subsystem 7 includes a second flash separator 71, a vapor compressor 72, and a heat exchanger 73. An inlet of the second flash separator 71 is communicated with a liquid fertilizer discharge port of the oil-water separator 6. A vapor outlet of the second flash separator 71 is in communication with a vapor compressor 72, the vapor compressor 72 delivering vapor to a heat exchanger 73. After the liquid fertilizer in the oil-water separator 6 is discharged into the second flash separator 71, the liquid fertilizer continues to undergo flash separation through the second flash separator 71, the separated water vapor is conveyed into the heat exchanger 73 through the steam compressor 72, and the concentrated material is discharged to external equipment through the discharge port for further treatment. Most of the steam is changed into condensed water after heat exchange in the heat exchanger 73, the part changed into the condensed water is pumped into a water tank for biochemical treatment, and the rest small part of concentrated liquid fertilizer is discharged into external equipment for additional treatment. Preferably, the heat exchangers 73 can be designed in two or more groups in parallel, so that the efficiency is improved.

Further, the secondary processing subsystem 7 further includes a third flash separator 74 (whether the flash separator is connected to the oil-water separator, and further introduces liquid fertilizer), an inlet of the third flash separator 74 is connected to a steam outlet of the second flash separator 71, and a steam outlet of the third flash separator 74 is connected to the steam compressor 72. At this time, the steam flash-separated in the second flash separator 71 enters the third flash separator 74 and is subjected to a flash separation again, and then the steam is discharged into the heat exchanger 73 through the steam compressor 72. The utilization efficiency of energy is improved, and the concentration and decrement of liquid materials are further improved.

In some preferred embodiments, the second flash separator 71 may be communicated with a heat-preserving chamber of the size mixing tank 1, and excess steam in the heat-preserving chamber may enter the second flash separator 71, so as to further improve the energy utilization efficiency.

The multi-stage distillation also becomes a multi-effect distillation, and the multi-effect distillation system is a heat exchange system formed by combining a plurality of evaporators in series. The method is characterized in that a plurality of evaporators are connected in series, secondary steam of the previous evaporator is used as heating steam of the next evaporator, and a heating chamber of the next evaporator is a condenser of the previous evaporator, so that the principle of the multi-effect evaporator is realized. The same amount of water is evaporated, the amount of raw steam required by multiple effects is far less than that of single effect, in the process of the multiple-effect evaporation system, the operating pressure and the solution boiling point of each effect are sequentially reduced, the secondary steam of the front effect is used as the heating steam of the rear effect, namely, the heating chamber of the rear effect is equal to the condenser of the secondary steam of the front effect, and only raw steam is consumed in the process, so that the steam utilization rate is improved.

The multi-stage distillation subsystem in the embodiment adopts a cocurrent feeding evaporation process, wherein the cocurrent feeding evaporation process means that the solution and the steam flow in the same direction and flow from one stage to the last stage in sequence, and is called a cocurrent feeding method. The concurrent feeding evaporation process can utilize the pressure difference between the effects for the solution transportation without pumping. Meanwhile, when the solution of the first effect flows into the first effect with lower temperature and pressure, evaporation (flash evaporation) is generated, so that a part of secondary steam can be generated. The operation is simple and convenient, and the process conditions are stable. After distillation, the separated liquid is separated into grease and salt through different specific gravities of the liquid except for concentrated liquid fertilizer, the liquid fertilizer is concentrated to 10% of the original quantity and is filled as concentrated liquid humic acid organic fertilizer, water after steam condensation after multi-effect distillation is introduced into a biochemical water treatment device for water treatment, and the water is discharged after reaching the standard.

Example 4

The embodiment 4 is a wet waste water thermal recycling treatment method based on the embodiment 3, which adopts a wet waste water thermal recycling treatment system, as shown in fig. 1-2, including a flash evaporation switching step and a multi-stage distillation step;

the flash switching step comprises:

a1, pumping sorted, crushed, pulped and emulsified wet garbage into a size mixing tank 1 through an emulsification pump;

a2, pumping wet garbage in the slurry mixing tank 1 into a first reaction kettle 51 through a screw pump 2;

a3, starting a heater 54 to heat the first reaction kettle 51, simultaneously sending air into the first reaction kettle 51 through an air compressor to pressurize, and keeping the first reaction kettle 51 at a preset temperature and a preset pressure for a preset time;

a4, pumping the wet garbage in the size mixing tank 1 into a second reaction kettle 52 through a screw pump 2 while the step A3 is carried out;

a5, after the first reaction kettle 51 is kept at constant temperature and constant pressure for a preset time, the first flash separator 52 and valves of the first reaction kettle 51 and the second reaction kettle 53 are opened, heat energy in the first reaction kettle 51 is transferred into the second reaction kettle 52 through the first flash separator 52 in a flash evaporation mode, and wet garbage in the second reaction kettle 52 is heated;

a6, after the temperature and the pressure in the first reaction kettle 51 are reduced to preset values, a discharge valve of the first reaction kettle 51 is opened, the material in the first reaction kettle 51 is conveyed into the centrifuge 3, the material is separated into a liquid material and a solid material through the centrifuge 6, the liquid material is conveyed into the liquid storage tank 4, and the solid material is conveyed to external equipment;

a7, heating the second reaction kettle 53 through a heater 54, simultaneously feeding air into the second reaction kettle 53 through an air compressor for pressurization, and keeping the second reaction kettle 53 at a preset temperature and a preset pressure for a preset time;

a8, while the step A7 is carried out, pumping the wet garbage in the size mixing tank 1 into a first reaction kettle 51 through a screw pump 2;

a9, after the second reaction kettle 53 is kept at constant temperature and constant pressure for a preset time, the first flash separator 52 and the valves of the first reaction kettle 51 and the second reaction kettle 53 are opened, and heat energy in the second reaction kettle 53 is transferred into the first reaction kettle 51 through the first flash separator 52 in a flash evaporation mode to heat wet garbage in the first reaction kettle 51;

a10, after the temperature and the pressure in the second reaction kettle 53 are reduced to preset values, opening a discharge valve of the second reaction kettle 53, conveying the material in the second reaction kettle 53 into a centrifuge 3, separating the material into a liquid material and a solid material through a centrifuge 6, conveying the liquid material into a liquid storage tank 4, and conveying the solid material to external equipment;

and A11, repeating the steps A1-A10.

Preferably, step A5 and/or step A9 further comprises a temperature and pressure balancing step, wherein the temperature and pressure balancing step comprises: the vapor transfer between the first flash separator 52 and the feed balance tank 55 allows the first reaction vessel 51 and the second reaction vessel 52 to maintain a balance of temperature and pressure during the feeding.

The multi-stage distillation step comprises:

b1, conveying the liquid material in the liquid storage tank 4 into an oil-water separator 6, separating the liquid material into water and liquid fertilizer through the oil-water separator 6, and conveying the liquid fertilizer into a second flash separator 71 for flash separation;

b2, carrying out flash evaporation separation by a second flash evaporation separator 71 to form steam and concentrated liquid fertilizer, sending the steam into a heat exchanger 71 by a steam compressor 72, and discharging the concentrated liquid fertilizer from a discharge outlet of the second flash evaporation separator 71 to external equipment;

b3, the heat exchanger 73 converts the steam into condensed water and concentrated liquid fertilizer through heat exchange, the condensed water is discharged into an external water tank, and the concentrated liquid fertilizer is conveyed to external equipment.

Preferably, step B2 further comprises a steam redistillation step in which the steam is: and after the steam generated in the feed balancing tank 55 is introduced into the heat preservation cavity of the size mixing tank 1 to preheat the size mixing tank 1, the redundant steam is introduced into the second flash separator 71 through a pipeline to carry out distillation.

In the description of the present application, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present application.

The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.

Claims (10)

1. A wet garbage hydrothermal recycling treatment system is characterized by comprising a slurry mixing tank (1), a screw pump (2), a centrifuge (3), a liquid storage tank (4) and a primary treatment subsystem (5);

the primary treatment subsystem (5) comprises a first reaction kettle (51), a first flash separator (52), a second reaction kettle (53) and a heater (54), the first reaction kettle (51) is communicated with the second reaction kettle (53) through the first flash separator (52), the heater (54) is used for respectively heating the first reaction kettle (51) and the second reaction kettle (53), the slurry mixing tank (1) is used for storing wet garbage after sorting, crushing, pulping and emulsifying, the screw pump (2) is used for respectively pumping the wet garbage in the slurry mixing tank (1) into the first reaction kettle (51) and the second reaction kettle (53), the centrifuge (7) receives materials in the first reaction kettle (51) and the second reaction kettle (53) and separates the materials into liquid materials and solid materials, the liquid materials are conveyed into the liquid tank (4), and the solid materials are conveyed to external equipment;

when the first reaction kettle (51) is heated and pressurized and kept for a preset time under a constant temperature and pressure state, the slurry mixing pipe (1) conveys the wet garbage into the second reaction kettle (53) through the screw pump (2), and before the first reaction kettle (51) is unloaded, the first flash separator (52) conveys heat energy into the second reaction kettle (53) to preheat the wet garbage in the second reaction kettle (53); when the second reaction kettle (5) is heated and pressurized and kept for a preset time under a constant temperature and pressure state, the slurry mixing tank (1) pumps the wet garbage into the first reaction kettle (3) with the emptied materials through the screw pump (2), and before the second reaction kettle (5) discharges the materials, the heat energy is conveyed into the first reaction kettle (3) through the first flash separator (4) to preheat the wet garbage in the second reaction kettle (53) and circulate in sequence.

2. The wet waste hydrothermal recycling system of claim 1, wherein the primary treatment subsystem (5) further comprises a feed balancing tank (55), the feed balancing tank (55) is in communication with the first flash separator (52), and the feed balancing tank (55) is configured to maintain a pressure and temperature balance between the first reaction vessel (51) and the second reaction vessel (53).

3. The wet garbage hydrothermal recycling treatment system as claimed in claim 2, wherein a heat preservation cavity is arranged on the outer peripheral surface of the slurry mixing tank (1), the feeding balance tank (55) is communicated with the heat preservation cavity, and steam in the feeding balance tank (55) is introduced into the heat preservation cavity to heat the slurry mixing tank (1).

4. The wet waste water thermal recycling treatment system according to claim 1, further comprising an oil-water separator (6), wherein the liquid material in the liquid storage tank (4) enters the oil-water separator (6) and is separated into water and liquid fertilizer, and the liquid fertilizer is sent to the next-stage treatment subsystem.

5. The wet garbage hydrothermal recycling treatment system according to claim 4, characterized in that the secondary treatment subsystem (7) comprises a second flash separator (71), a vapor compressor (72) and a heat exchanger (73), the second flash separator (71) is communicated with the oil-water separator (6) and receives the delivered liquid fertilizer, the second flash separator (71) delivers the vapor to the heat exchanger (73) through the vapor compressor (72), the condensed water discharged from the heat exchanger (73) enters an external water tank, and the second flash separator (71) and the concentrated liquid fertilizer from the heat exchanger (73) are discharged to external equipment.

6. The wet waste water thermal reclamation processing system as recited in claim 5, wherein the second flash separator (71) is communicated with the heat-preserving chamber, and excess steam in the heat-preserving chamber enters the second flash separator (71).

7. The wet waste water thermal reclamation processing system as recited in claim 5, wherein the secondary processing subsystem (7) further comprises a third flash separator (74), an inlet of the third flash separator (74) being in communication with the second flash separator (71), an outlet of the third flash separator (74) being in communication with the vapor compressor (72).

8. A wet waste hydrothermal recycling treatment method is characterized in that the wet waste hydrothermal recycling treatment system according to any one of claims 5 to 7 is adopted, and comprises a flash evaporation switching step and a multi-stage distillation step;

the flash switching step comprises:

a1, pumping sorted, crushed, pulped and emulsified wet garbage into a size mixing tank (1) through an emulsification pump;

a2, pumping the wet garbage in the size mixing tank (1) into the first reaction kettle (51) through the screw pump (2);

a3, starting the heater (54) to heat the first reaction kettle (51), and simultaneously feeding air into the first reaction kettle (51) through an air compressor to pressurize, wherein the first reaction kettle (51) is kept at a preset temperature and a preset pressure for a preset time;

a4, pumping the wet garbage in the size mixing tank (1) into the second reaction kettle (52) through the screw pump (2) while the step A3 is carried out;

a5, after the first reaction kettle (51) is kept at constant temperature and constant pressure for a preset time, opening valves of the first flash separator (52) and the first reaction kettle (51) and the second reaction kettle (53), and transferring heat energy in the first reaction kettle (51) into the second reaction kettle (52) through the first flash separator (52) in a flash evaporation mode to heat wet garbage in the second reaction kettle (52);

a6, after the temperature and the pressure in the first reaction kettle (51) are reduced to preset values, a discharge valve of the first reaction kettle (51) is opened, the material in the first reaction kettle (51) is conveyed into the centrifuge (3), the material is separated into liquid material and solid material through the centrifuge (6), the liquid material is conveyed into the liquid storage tank (4), and the solid material is conveyed to an external device;

a7, heating the second reaction kettle (53) through the heater (54), and simultaneously feeding air into the second reaction kettle (53) through an air compressor for pressurization, wherein the second reaction kettle (53) is kept at a preset temperature and a preset pressure for a preset time;

a8, while the step A7 is carried out, pumping the wet garbage in the size mixing tank (1) into the first reaction kettle (51) through the screw pump (2);

a9, after the second reaction kettle (53) is kept at constant temperature and constant pressure for a preset time, starting valves of the first flash separator (52) and the first reaction kettle (51) and the second reaction kettle (53), and transferring heat energy in the second reaction kettle (53) into the first reaction kettle (51) through flash evaporation of the first flash separator (52) to heat wet garbage in the first reaction kettle (51);

a10, after the temperature and the pressure in the second reaction kettle (53) are reduced to preset values, a discharge valve of the second reaction kettle (53) is opened, the material in the second reaction kettle (53) is conveyed into the centrifuge (3), the material is separated into liquid material and solid material through the centrifuge (6), the liquid material is conveyed into the liquid storage tank (4), and the solid material is conveyed to an external device;

and A11, repeating the steps A1-A10.

The multistage distillation step comprises:

b1, conveying the liquid material in the liquid storage tank (4) into an oil-water separator (6), separating the liquid material into water and liquid fertilizer through the oil-water separator (6), and conveying the liquid fertilizer into the second flash separator (71) for flash separation;

b2, performing flash evaporation separation by the second flash evaporation separator (71) to form steam and concentrated liquid fertilizer, wherein the steam is sent into the heat exchanger (71) by the steam compressor (72), and the concentrated liquid fertilizer is discharged to external equipment from a discharge outlet of the second flash evaporation separator (71);

b3, the heat exchanger (73) converts the steam into condensed water and concentrated liquid fertilizer through heat exchange, the condensed water is discharged into an external water tank, and the concentrated liquid fertilizer is conveyed to external equipment.

9. The wet waste water thermal reclamation treatment method as claimed in claim 8, wherein the step A5 and/or the step A9 further comprises a temperature and pressure balancing step, and the temperature and pressure balancing step comprises: the first flash separator (52) is in vapor communication with the feed equalization tank (55) such that the first reaction vessel (51) and the second reaction vessel (52) maintain a temperature and pressure balance as they are fed.

10. The wet waste water thermal recycling method according to claim 8 or 9, further comprising a steam redistillation step in the step B2, wherein the steam distillation step is: and steam generated in the feeding balance tank (55) is introduced into a heat preservation cavity of the size mixing tank (1) to preheat the size mixing tank (1), and then redundant steam is introduced into the second flash separator (71) through a pipeline to carry out distillation.

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