CN212713108U - Fly ash washing and evaporative crystallization system - Google Patents
Fly ash washing and evaporative crystallization system Download PDFInfo
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- CN212713108U CN212713108U CN202021280109.2U CN202021280109U CN212713108U CN 212713108 U CN212713108 U CN 212713108U CN 202021280109 U CN202021280109 U CN 202021280109U CN 212713108 U CN212713108 U CN 212713108U
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Abstract
The utility model discloses a flying ash washing and evaporative crystallization system, the bottom of a flying ash washing device is connected with the bottom of a heat pipe condensation tower through a water pump, the upper part of the heat pipe condensation tower is connected with a water inlet at the top of a falling film evaporative crystallization tower, and a condensed water outlet at the side surface of the heat pipe condensation tower is connected with the top of the flying ash washing device; a hot water outlet on the side surface of the falling film evaporation crystallization tower is connected with a heat pipe condensation tower, a steam outlet at the bottom of the falling film evaporation crystallization tower is connected with a crystallized salt separator, the top of the crystallized salt separator is connected with a steam compressor, and the steam compressor is communicated with the falling film evaporation crystallization tower; and the bottoms of the crystallized salt separator and the falling film evaporation crystallization tower are provided with crystallized salt outlets. The utility model discloses the steam heat recovery who produces the crystallization evaporation utilizes the back condensation to be used for flying dust washing, realizes the inner loop of water, reaches the water conservation and does not have the outer environmental protection effect who arranges of waste water.
Description
Technical Field
The utility model belongs to the technical field of domestic waste burns flying dust and handles, in particular to flying dust washing and evaporative crystallization system.
Background
Fly ash is generated in the waste incineration process, and contains salt, heavy metal, dioxin and the like, so that environmental pollution is caused, and therefore, the fly ash needs to be effectively and safely treated. At present, fly ash is mainly treated by adopting stabilized landfill and a cement kiln in a synergistic way. High concentrations of soluble salts in the fly ash pose a threat to landfill body stability and also affect cement quality. Therefore, the fly ash is treated after being efficiently washed, which is gradually becoming a consensus, and the market demand is increasing. The fly ash washing process generates a large amount of salt-containing wastewater, and secondary treatment is needed. The biological method can not be sampled to treat the high-salinity wastewater, and the conventional evaporation crystallization has high energy consumption and high cost.
Disclosure of Invention
The utility model aims at overcoming current waste incineration flying dust and handling bottleneck and difficult point, providing a flying dust washing and evaporation crystallization system, can realize that the high-efficient washing of flying dust is desalted and the energy-conserving evaporation of waste water retrieves the crystalline salt.
Therefore, the technical scheme of the utility model is that: a fly ash washing and evaporative crystallization system is characterized in that: comprises a fly ash washing device, a heat pipe condensing tower, a falling film evaporation crystallization tower, a steam compressor and a crystallized salt separator; the bottom of the fly ash washing device is connected with the bottom of a heat pipe condensing tower through a water pump, the upper part of the heat pipe condensing tower is connected with a water inlet at the top of a falling film evaporation crystallization tower, and a condensed water outlet at the side surface of the heat pipe condensing tower is connected to the top of the fly ash washing device; a hot water outlet on the side surface of the falling film evaporation crystallization tower is connected with a heat pipe condensation tower, a steam outlet at the bottom of the falling film evaporation crystallization tower is connected with a crystallized salt separator, the top of the crystallized salt separator is connected with a steam compressor, and the steam compressor is communicated with the falling film evaporation crystallization tower; and the bottoms of the crystallized salt separator and the falling film evaporation crystallization tower are provided with crystallized salt outlets.
Preferably, the bottom of the falling film evaporation crystallization tower is provided with a rotatable centrifugal plate, a steam outlet is positioned on one side of the centrifugal plate, and a first crystallization salt outlet is positioned below the centrifugal plate.
Preferably, the salt separator contains salt fog filter screen and whirl board in, and the salt separator bottom of crystallizing is the cone structure, and the second salt outlet of crystallizing is located the end of cone structure.
High-salinity wastewater generated by secondary washing of the fly ash in the fly ash washing device is pumped into a heat pipe condensing tower by a water pump to be preheated, and the heat pipe condensing tower can generate medium-temperature high-salinity wastewater and condensed water; the heated medium-temperature high-salt wastewater is sprayed into the falling film evaporation crystallization tower from the top of the falling film evaporation crystallization tower, exchanges heat with high-temperature high-pressure steam generated by a steam compressor in the falling film evaporation crystallization tower to carry out evaporation crystallization, and when salt-containing steam passes through a centrifugal plate below, the salt-containing steam generates rotation and centrifugal motion, so that the crystallized salt and the steam are separated for the first time, and the crystallized salt is collected at the bottom of the falling film evaporation crystallization tower. And salt fog steam enters into the crystal salt separator, and the salt fog steam generates rotation and centrifugal motion when passing through the blades of the rotational flow plate, and the steam continuously rises and intercepts the salt fog through the salt fog filter screen, and drips and collects at the bottom of the crystal salt separator. The secondary steam is compressed by a steam compressor (a compression ratio 2) to form high-temperature high-pressure steam, the high-temperature high-pressure steam enters a falling film evaporation crystallization tower to heat and evaporate salt-containing wastewater, and hot water discharged by the falling film evaporation crystallization tower passes through a heat pipe condensing tower to generate condensed water, and the condensed water enters a fly ash washing device to wash fly ash.
The original fly ash is dewatered by a vacuum belt conveyor and a plate-and-frame filter press in a secondary washing mode to generate desalted fly ash, the total water-ash ratio is about 6, and the ratio of external supplementing water to the original ash is about 0.18; and the generated high-salt-content wastewater enters a heat pipe condensing tower for preheating. The whole system is required to be firstly introduced with starting steam during starting, and the starting steam can be closed after starting.
The utility model discloses an excellent beneficial effect lies in:
1) the utility model recovers the latent heat of waste water evaporation and the waste heat of the crystallizer effluent, improves the system energy utilization efficiency and has the energy-saving effect;
2) the utility model recycles the steam heat generated by crystallization evaporation and then condenses the steam heat for washing fly ash, realizes the internal circulation of water, and achieves the environmental protection effects of water saving and no wastewater discharge;
3) the bottom centrifugal plate of the falling film evaporator and the salt mist trapping device realize secondary separation of crystallized salt, improve separation of the crystallized salt, reduce damage to blades of a vapor compressor and prolong the service life of a device system;
4) the utility model discloses well flying dust washing adopts second grade washing mode, pipeline one-way connection.
Drawings
The following detailed description is made with reference to the accompanying drawings and embodiments of the present invention
Fig. 1 is a schematic structural view of the present invention;
FIG. 2 is a flow chart of the operation of the fly ash washing device.
Labeled as: the device comprises a fly ash washing device 1, a crystallized salt separator 2, a salt mist filter screen 21, a rotational flow plate 22, a vapor compressor 3, a falling film evaporation crystallization tower 4, a centrifugal plate 41, a heat pipe condensing tower 5 and a water pump 6;
the method comprises the following steps of salt-containing wastewater a, hot water b, medium-temperature salt-containing wastewater c, high-temperature high-pressure steam d, crystallized salt e1, secondary crystallized salt e2, salt spray steam f, condensed water g, original fly ash h, desalted fly ash i, starting steam j, exogenous make-up water k and secondary steam m.
Detailed Description
See the drawings. The fly ash washing and evaporative crystallization system comprises a fly ash washing device 1, a crystallized salt separator 2, a vapor compressor 3, a falling film evaporative crystallization tower 4, a heat pipe condensing tower 5 and a water pump 6; the bottom of the fly ash washing device 1 is connected with the bottom of a heat pipe condensing tower 5 through a water pump 6, a water inlet at the top of a falling film evaporation crystallization tower 4 is connected above the heat pipe condensing tower 5, and a condensed water outlet at the side surface of the heat pipe condensing tower 5 is connected to the top of the fly ash washing device 1; the bottom of the falling film evaporation crystallization tower 4 is provided with a centrifugal plate 41, and when steam passes through the centrifugal plate 41 below, centrifugal motion is generated, so that crystallized salt is separated from the steam; a steam outlet of the falling film evaporation crystallization tower 4 is connected with a crystallized salt separator 2, the crystallized salt separator 2 contains a salt mist filter screen 21 and a cyclone plate 22, and the bottom of the salt mist filter screen is conical, so that liquid and crystallized salt can be conveniently collected to the bottom of the crystallized salt separator; the top of the crystallized salt separator 2 is connected with a vapor compressor 3, and the discharged secondary steam enters the vapor compressor 3 and is compressed into high-temperature high-pressure steam; the steam compressor 3 is communicated with the falling film evaporation crystallization tower 4, and high-temperature and high-pressure steam enters the falling film evaporation crystallization tower 4 to heat and evaporate the salt-containing wastewater; the hot water at the outlet of the falling film evaporation crystallization tower 4 is communicated with the heat pipe condensing tower 5, the condensed water generated after the hot water discharged from the falling film evaporation crystallization tower 4 passes through the heat pipe condensing tower 5 enters the fly ash washing device 1 for washing and desalting, the generated salt-containing wastewater is pumped into the heat pipe condensing tower 5 and then enters the falling film evaporation crystallization tower for evaporation and crystallization, and therefore circulation is formed.
The working process is as follows: salt-containing wastewater a (room temperature, 25 ℃) is pumped into a heat pipe condensing tower 5 by a water pump 6, the flow is 50t/h, the salt concentration is about 5-6%, after the salt-containing wastewater a exchanges heat with hot water b (80 ℃) discharged by a falling film evaporation crystallization tower 4 in the heat pipe condensing tower 5 and is preheated, medium-temperature salt-containing wastewater c (60 ℃) is sprayed from the top of the falling film evaporation crystallization tower 4, and exchanges heat with high-temperature high-pressure steam d (150 ℃, 0.2MPa) generated by a steam compressor 3 in the falling film evaporation crystallization tower 4 for evaporation. Salt-containing steam (100 ℃, 0.1MPa) passes through the lower centrifugal plate 41, the crystallized salt is separated from the steam once, the crystallized salt e1 is collected at the bottom of the falling film evaporation crystallization tower 4, and the collection amount of the crystallized salt e1 is about 2.3 t/h. And the salt spray steam f enters the crystallized salt separator 2, the salt spray steam f generates rotation and centrifugal motion when passing through blades of the rotational flow plate 22, the steam continuously rises and intercepts the salt spray through the salt spray filter screen 21, the salt spray drops and collects at the bottom of the crystallized salt separator 2, and the collection amount of secondary crystallized salt e2 is about 0.2 t/h. The secondary steam m is compressed by a steam compressor 3 (a compression ratio 2) to form high-temperature high-pressure steam d (150 ℃, 0.2MPa), the high-temperature high-pressure steam d enters a falling film evaporation crystallization tower 4 to heat and evaporate the medium-temperature salt-containing wastewater c, and hot water b (-80 ℃) discharged by the falling film evaporation crystallization tower 4 passes through a heat pipe condensing tower 5 to generate condensed water g (40 ℃) and then enters a fly ash washing device 1 to wash fly ash. The original fly ash h is subjected to secondary washing, vacuum filtration and plate-and-frame filter pressing to generate desalted fly ash i (the water content is 30%), the washing water-ash ratio is about 6, and the generated salt-containing wastewater a enters a heat pipe condensing tower 5 for preheating. The whole system is required to be firstly introduced with starting steam j during starting, and the starting steam can be closed after starting. After the fly ash washing device is started, the water amount of the external supplement water k is 1.5 t/h.
Claims (3)
1. A fly ash washing and evaporative crystallization system is characterized in that: comprises a fly ash washing device, a heat pipe condensing tower, a falling film evaporation crystallization tower, a steam compressor and a crystallized salt separator; the bottom of the fly ash washing device is connected with the bottom of a heat pipe condensing tower through a water pump, the upper part of the heat pipe condensing tower is connected with a water inlet at the top of a falling film evaporation crystallization tower, and a condensed water outlet at the side surface of the heat pipe condensing tower is connected to the top of the fly ash washing device; a hot water outlet on the side surface of the falling film evaporation crystallization tower is connected with a heat pipe condensation tower, a steam outlet at the bottom of the falling film evaporation crystallization tower is connected with a crystallized salt separator, the top of the crystallized salt separator is connected with a steam compressor, and the steam compressor is communicated with the falling film evaporation crystallization tower; and the bottoms of the crystallized salt separator and the falling film evaporation crystallization tower are provided with crystallized salt outlets.
2. A fly ash water washing and evaporative crystallization system as claimed in claim 1, wherein: the bottom of the falling film evaporation crystallization tower is provided with a rotatable centrifugal plate, a steam outlet is positioned on one side of the centrifugal plate, and a first crystallization salt outlet is positioned below the centrifugal plate.
3. A fly ash water washing and evaporative crystallization system as claimed in claim 1, wherein: the crystal salt separator contains a salt mist filter screen and a cyclone plate, the bottom of the crystal salt separator is of a conical structure, and a second crystal salt outlet is located at the tail end of the conical structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021280109.2U CN212713108U (en) | 2020-07-02 | 2020-07-02 | Fly ash washing and evaporative crystallization system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021280109.2U CN212713108U (en) | 2020-07-02 | 2020-07-02 | Fly ash washing and evaporative crystallization system |
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| CN212713108U true CN212713108U (en) | 2021-03-16 |
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| CN202021280109.2U Active CN212713108U (en) | 2020-07-02 | 2020-07-02 | Fly ash washing and evaporative crystallization system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113620497A (en) * | 2021-08-27 | 2021-11-09 | 国网陕西省电力公司电力科学研究院 | Transformer substation sewage treatment process |
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2020
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113620497A (en) * | 2021-08-27 | 2021-11-09 | 国网陕西省电力公司电力科学研究院 | Transformer substation sewage treatment process |
| CN113620497B (en) * | 2021-08-27 | 2023-05-19 | 国网陕西省电力公司电力科学研究院 | Sewage treatment process for transformer substation |
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