A steam regenerated sludge drying device

Abstract

The present invention relates to the technical field of sludge drying, and in particular to a steam-regenerated sludge drying device. A steam-regenerated sludge drying device comprises a steam thin-layer dryer, an external steam input port and a flash evaporation device. The external steam input port is connected to the steam thin-layer dryer. The flash evaporation device is provided with a demister, a liquid retainer and a sprayer in sequence. The external steam input port is connected to the flash evaporation device. The first condensate output port of the steam thin-layer dryer and the second condensate output port of the flash evaporation device are connected to the sprayer through a condensate delivery pipe. A condensate circulation water pump is provided on the condensate delivery pipe. A steam-regenerated sludge drying device has the advantages of fully recycling and utilizing steam condensate, greatly reducing the loss of condensate waste heat; increasing the temperature of the regenerated steam, reducing the heat load of purchased steam or steam boilers, reducing the production and operation costs of the enterprise, saving energy and protecting the environment, and achieving comprehensive energy utilization.

Description

Technical Field

[0001] The present invention relates to the technical field of sludge drying, and in particular to a steam-regenerated sludge drying device. Background Art

[0002] Steam drying is an important drying technology that utilizes steam energy to evaporate the water in the sludge through heat exchange in the shell of a heat exchanger. Low-pressure steam is generally used and is widely used due to its high efficiency, operational flexibility, ease of control, and excellent stability.

[0003] However, current sludge drying equipment discharges condensate generated during the sludge drying process. For example, Chinese invention patent publication number CN113045178A discloses a steam fluidized heating sludge drying system comprising a bubbling bed sludge dryer, a cyclone purifier, and a steam regenerator connected in sequence. The bubbling bed sludge dryer is divided into at least two upper connected spaces from the inlet to the outlet, each space having an air distribution chamber below. The cyclone purifier's slag discharge pipe is inserted below the bed layer of the first space. The steam regenerator comprises a main working chamber, a drain tank, and an auxiliary water tank, the drain tank and the auxiliary water tank being located on either side of the main working chamber. The main working chamber has multiple heat exchange surfaces spaced apart from top to bottom, and the main working chamber is connected to each air distribution chamber via a pipe. Discharging condensate increases steam input, boiler gas consumption, sludge drying costs, energy waste, and environmental damage. Summary of the Invention

[0004] In view of this, the present invention aims to provide a steam-regenerated sludge drying device, which recovers condensed water on the basis of the original drying process and recycles the condensed water. The steam condensed water enters the steam compressor after low-pressure flash evaporation and separation, and regenerates low-pressure steam to solve the problems of high steam input, large boiler gas consumption, high sludge drying cost, serious energy waste, and environmental pollution.

[0005] To solve the above problems, the present invention provides a steam-regenerated sludge drying device, comprising:

[0006] The steam thin layer dryer is provided with a material inlet and a first condensate outlet;

[0007] an external steam input port, connected to the steam thin layer drying machine via a steam inlet;

[0008] The flash evaporation device is equipped with a demister, a liquid retainer and a sprayer in sequence;

[0009] The external steam input port is on the side of the demister away from the liquid retainer and is connected to the flash evaporation device through the secondary steam outlet;

[0010] A second condensate outlet is provided on a side of the flash evaporation device close to the sprayer, and the first condensate outlet and the second condensate outlet are connected to the sprayer through a condensate delivery pipe;

[0011] A condensate circulating water pump is provided on the condensate water delivery pipe.

[0012] Furthermore, the liquid baffle includes a liquid baffle plate and a liquid baffle mechanism which are sequentially arranged from the demister to the sprayer.

[0013] Furthermore, a bypass channel is provided inside the liquid blocking mechanism, and the bypass channel is communicated with the liquid blocking plate and the sprayer.

[0014] Furthermore, the liquid blocking mechanism includes:

[0015] a bottom plate, which is laterally arranged in the middle of the flash evaporation device, and the bottom plate (27) has at least four sides, including two pairs of opposite sides, wherein one pair of opposite sides is connected to the inner wall of the flash evaporation device (16), and a preset gap is formed between the other pair of opposite sides and the inner wall of the flash evaporation device (16);

[0016] a fixed plate assembly, comprising two fixed plates arranged side by side, the two fixed plates being spaced apart by a first preset distance, the fixed plate assembly being connected to the bottom plate and the side wall of the flash evaporation device;

[0017] an upper baffle, a first end of which is fixed to the side wall of the flash evaporation device, a second end of which extends obliquely toward the bottom plate, a gap being defined between the second end of the upper baffle and the bottom plate, and a second preset distance being spaced between the upper baffle and the fixed plate assembly;

[0018] The gap between the bottom plate and the side wall of the flash evaporation device, the gap between the fixed plates and between the fixed plate assembly and the side wall of the flash evaporation device, the distance between the fixed plate assembly and the upper baffle plate, and the gap between the upper baffle plate and the bottom plate form the bypass channel.

[0019] Furthermore, two of the fixed plate assemblies and two of the upper baffles are symmetrically arranged relative to the center of the flash evaporation device.

[0020] Furthermore, the steam regeneration sludge drying device further comprises:

[0021] A cooler is connected to the flash evaporation device between the liquid blocking mechanism and the sprayer.

[0022] Furthermore, the cooler is connected to a vacuum pump.

[0023] Furthermore, the steam regeneration sludge drying device further comprises:

[0024] The discharge bin is communicated with the sludge outlet of the steam thin layer dryer, and a discharge port is provided on the discharge bin.

[0025] Furthermore, the steam regeneration sludge drying device further comprises:

[0026] The steam compressor is arranged between the external steam input port and the steam inlet.

[0027] Furthermore, the steam thin layer drying machine is provided with an exhaust gas outlet.

[0028] Compared with the prior art, the steam regeneration sludge drying device described in the present invention has the following advantages:

[0029] The advantage of this technical solution is that it adopts the steam regeneration sludge drying technology system of the present invention and utilizes the control system to fully recycle and utilize the steam condensate, greatly reducing the loss of waste heat of the condensate; increasing the temperature of the regenerated steam, reducing the heat load of purchased steam or steam boilers, reducing the production and operation costs of the enterprise, saving energy and protecting the environment, and achieving comprehensive energy utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A schematic diagram of the structure of a steam-regenerated sludge drying device proposed in an embodiment of the present invention;

[0031] Figure 2 This is a schematic diagram of the liquid blocking mechanism structure proposed in an embodiment of the present invention.

[0032] Description of reference numerals:

[0033] 1-steam thin layer dryer, 2-exhaust port, 3-steam inlet, 4-material inlet, 5-vacuum pump, 6-cooler, 7-steam compressor, 8-external steam input port, 9-secondary steam outlet, 10-demister, 11-liquid baffle, 12-cooling water, 13-liquid baffle mechanism, 14-condensate outlet, 15-sprinkler, 16-flash device, 17-second condensate output port, 18-condensate outlet main pipe, 19-condensate delivery pipe, 20-condensate circulating water pump, 21-first condensate output port, 22-discharge port, 23-discharge silo, 24-sludge outlet, 25-upper baffle, 26-fixed plate assembly, 27-bottom plate. DETAILED DESCRIPTION

[0034] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0035] In the present invention, the descriptions involving "first," "second," "upper," and "lower," etc. are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first," "second," "upper," and "lower" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments may be combined with each other, but this must be based on the fact that they can be implemented by a person of ordinary skill in the art. When the technical solutions between the embodiments can be combined, they are all within the scope of protection claimed by the present invention.

[0036] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0037] like Figure 1 As shown, a steam-regenerated sludge drying device comprises: a steam thin-layer dryer 1, an external steam input port 8 and a flash evaporation device 16. The steam thin-layer dryer 1 is provided with a material inlet 4 and a first condensate output port 21. The external steam input port 8 is connected to the steam thin-layer dryer 1 through the steam inlet 3. The flash evaporation device 16 is provided with a demister 10, a liquid retainer and a sprayer 15 in sequence. The external steam input port 8 is connected to the flash evaporation device 16 through a secondary steam outlet 9 on the side of the demister 10 away from the liquid retainer. A second condensate output port 17 is provided on the side of the flash evaporation device 16 close to the sprayer 15, and the first condensate output port 21 and the second condensate output port 17 are connected to the sprayer 15 through a condensate delivery pipe 19. A condensate circulation water pump 20 is provided on the condensate delivery pipe 19.

[0038] The steam-regenerated sludge drying device of the above structure is connected to the sprayer 15 through the first condensate outlet 21 and the second condensate outlet 17 via the condensate delivery pipe 19. The condensate discharged from the steam thin-layer dryer 1 enters the sprayer 15 for flash evaporation to produce saturated steam. The sprayer 15 is located in the upper part of the flash chamber inside the flash evaporation device 16. The condensate discharged from the flash evaporation device 16 is then transported back to the flash evaporation device 16. At the same time, the condensate generated in the steam thin-layer dryer 1 is also transported to the flash evaporation device 16 and sprayed through the sprayer 15, thereby realizing the reuse of the condensate. The control system fully recycles and reuses the steam condensate, significantly reducing the loss of waste heat from the condensate; increasing the temperature of the regenerated steam, reducing the heat load of purchased steam or steam boilers, reducing the production and operation costs of the enterprise, saving energy and protecting the environment, and achieving comprehensive energy utilization.

[0039] In the initial stage of operation, external steam is first added through the external steam input port 8. After the system runs stably, the external steam input is reduced or closed.

[0040] The liquid retainer includes a liquid retaining plate 11 and a liquid retaining mechanism 13 which are sequentially arranged from the demister 10 to the sprayer 15 .

[0041] A bypass channel is provided inside the liquid blocking mechanism 13 , and the bypass channel is communicated with the liquid blocking plate 11 and the sprayer 15 .

[0042] The liquid retaining mechanism 13 includes a bottom plate 27, a fixed plate assembly 26, and an upper baffle 25. The bottom plate 27 is disposed transversely in the middle of the flash evaporation device 16 and has at least four sides, including two pairs of opposing sides. One pair of opposing sides is connected to the inner wall of the flash evaporation device 16, and the other pair of opposing sides has a preset gap between them. The fixed plate assembly 26 includes two fixed plates arranged side by side, separated by a first preset distance. The fixed plate assembly 26 is connected to the bottom plate 27 and the side wall of the flash evaporation device 16. The upper baffle 25 has a first end fixed to the side wall of the flash evaporation device 16 and a second end extending obliquely toward the bottom plate 27. A gap is formed between the second end of the upper baffle 25 and the bottom plate 27, and a second preset distance is separated between the upper baffle 25 and the fixed plate assembly 26. The gap between the bottom plate 27 and the side wall of the flash evaporation device 16, the gap between the fixed plates and between the fixed plate assembly 26 and the side wall of the flash evaporation device 16, the distance between the fixed plate assembly 26 and the upper baffle 25, and the gap between the upper baffle 25 and the bottom plate 27 form the bypass channel.

[0043] Preferably, one end of the upper baffle 25 connected to the inner wall of the flash evaporation device 16 is in an arc shape that conforms to the inner wall, so as to avoid a gap between the upper baffle 25 and the inner wall, which would cause steam to leak out of the gap.

[0044] The saturated steam passes through the liquid blocking mechanism 13, blocks and filters out the condensate particles, then enters the liquid blocking plate 11, then enters the demister 10 for further gas-liquid separation, and finally is discharged as dry saturated steam. The blocked condensate falls back to the bottom plate 27, and falls into the flash chamber from around the bottom plate 27. It re-enters the flash evaporation device 16 through the second condensate output port 17. A bypass channel of the above structure is provided inside the liquid blocking mechanism 13, and the bypass channel is connected to the liquid blocking plate 11 and the sprayer 15. The flash steam passes through the liquid blocking mechanism 13 in the flash evaporation device 16, and is initially separated by bypassing and collision.

[0045] The steam condensate from the steam thin layer dryer 1 enters the flash evaporation device 16, and is discharged through the flash evaporation spray device 15, the liquid blocking mechanism 13, the liquid blocking plate 11, the demister 10, etc. to generate dry saturated steam, and enters the steam compressor 7 to generate low-pressure steam 3 that enters the steam thin layer dryer 1 to dry the sludge.

[0046] Two of the fixed plate assemblies 26 and the upper baffles 25 are symmetrically arranged relative to the center of the flash evaporation device.

[0047] The steam regeneration sludge drying device further includes a cooler 6 connected to the flash evaporation device 16 between the liquid blocking mechanism 13 and the sprayer 15 .

[0048] Cooling water 12 is passed through the cooler 6 , and the cooler 6 is connected to a vacuum pump 5 .

[0049] The non-condensable gas is extracted from the flash device 16 by using the vacuum pump 5 and first cooled by the cooling water on the other side through the cooler 6. Part of the steam extracted from the vacuum pipeline is condensed and discharged from the condensate outlet 14 of the cooler 6.

[0050] The steam regenerated sludge drying device further includes: a discharge bin 23 connected to the sludge outlet 24 of the steam thin layer dryer 1, and a discharge port 22 is provided on the discharge bin 23.

[0051] The wet sludge material enters the steam thin layer dryer 1 from the material inlet 4 , is dehydrated and dried, and is discharged from the sludge outlet 24 of the steam thin layer dryer 1 , enters the dry sludge discharge bin 23 , and is finally discharged from the sludge outlet 24 .

[0052] The steam compressor 7 is arranged between the external steam input port 8 and the steam inlet 3 .

[0053] The steam after flash separation enters the steam compressor 7 for pressurization, temperature increase and compression, and generates high-temperature steam which enters the steam thin-layer dryer 1 through the steam inlet 3 .

[0054] The steam thin layer drying machine 1 is provided with an exhaust port 2. Waste generated during the drying process is discharged from the exhaust port 2.

[0055] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be based on the scope defined by the claims.

Claims

1. A steam regenerated sludge drying device, characterized in that: include: A steam thin-layer drying machine (1) is provided with a material inlet (4) and a first condensate outlet (21); An external steam input port (8) is connected to the steam thin layer drying machine (1) via a steam inlet (3); A flash evaporation device (16) is provided with a demister (10), a liquid retainer and a sprayer (15) in sequence; The external steam input port (8) is on a side of the demister (10) away from the liquid retainer and is connected to the flash evaporation device (16) through a secondary steam outlet (9); A second condensate outlet (17) is provided on a side of the flash evaporation device (16) close to the sprayer (15), and the first condensate outlet (21) and the second condensate outlet (17) are connected to the sprayer (15) via a condensate delivery pipe (19); A condensate circulating water pump is provided on the condensate water delivery pipe (19); The liquid retainer comprises a liquid retaining plate (11) and a liquid retaining mechanism (13) arranged in sequence from the demister (10) to the sprayer (15); A bypass channel is provided inside the liquid blocking mechanism (13), and the bypass channel is in communication with the liquid blocking plate (11) and the sprayer (15); The liquid blocking mechanism (13) comprises: a bottom plate (27) disposed transversely in the middle of the flash evaporation device (16), and the bottom plate (27) has at least four side edges, including two pairs of opposite side edges, wherein one pair of opposite side edges is connected to the inner wall of the flash evaporation device (16), and a preset gap is formed between the other pair of opposite side edges and the inner wall of the flash evaporation device (16); a fixed plate assembly (26), comprising two fixed plates arranged side by side, the two fixed plates being spaced apart by a first preset distance, the fixed plate assembly (26) being connected to the bottom plate (27) and the side wall of the flash evaporation device (16); an upper baffle (25), a first end of which is fixed to a side wall of the flash evaporation device (16), a second end of which is inclined and extends toward the bottom plate (27), and a gap is provided between the second end of the upper baffle (25) and the bottom plate (27), and a second preset distance is provided between the upper baffle (25) and the fixed plate assembly (26); The gap between the bottom plate (27) and the side wall of the flash evaporation device (16), the gap between the fixed plates and between the fixed plate assembly (26) and the side wall of the flash evaporation device (16), the distance between the fixed plate assembly (26) and the upper baffle (25), and the gap between the upper baffle (25) and the bottom plate (27) form the bypass channel; A cooler (6) is connected to the flash evaporation device (16) between the liquid blocking mechanism (13) and the sprayer (15).

2. The steam regenerated sludge drying device according to claim 1, characterized in that: Two of the fixed plate assemblies (26) and two of the upper baffles (25) are symmetrically arranged relative to the center of the flash evaporation device.

3. The steam regenerated sludge drying device according to claim 1, characterized in that: The cooler (6) is connected to a vacuum pump (5).

4. The steam regenerated sludge drying device according to claim 1, characterized in that: Also includes: The discharge bin (23) is in communication with the sludge outlet (24) of the steam thin-layer dryer (1), and a discharge port (22) is provided on the discharge bin (23).

5. The steam regenerated sludge drying device according to claim 1, characterized in that: Also includes: The steam compressor (7) is arranged between the external steam input port (8) and the steam inlet (3).

6. The steam regenerated sludge drying device according to claim 1, characterized in that: The steam thin layer drying machine (1) is provided with an exhaust gas outlet (2).

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