STEAM HEATING TYPE SEWAGE TREATMENT DEVICE

Abstract

A steam heating type sewage treatment device includes: a treatment tank connected to a sewage supply pipe, a stirring device disposed in the treatment tank; a steam heating device disposed on an outer surface of the treatment tank; a vacuuming device fixed to a top of the treatment tank and connected to the treatment tank via a first connecting pipe; a heating device connected to the treatment tank by a second connecting pipe and connected to a steam storage tank by a third connecting pipe, and a fourth connecting pipe connected between the steam input pipe and the steam storage tank to recycle the steam. The heating device pressurizes or heats the steam entering the vacuuming device and the connecting pipes, and the heated steam is guided by pipes into the steam heating device, thus achieving the effect of steam recycling.

Claims

1. A steam heating type sewage treatment device, comprising: a treatment tank; a stirring device disposed in the treatment tank; a steam heating device disposed on an outer surface of the treatment tank, and provided with a steam input pipe and a steam output pipe at two sides of a bottom of the steam heating device; a vacuuming device fixed to a top of the treatment tank, and connected to the treatment tank via a first connecting pipe; the steam heating type sewage device being characterized in that: a heating device is connected to the treatment tank by a second connecting pipe, and connected to a steam storage tank by a third connecting pipe, and a fourth connecting pipe is connected between the steam input pipe and the steam storage tank.

2. The steam heating type sewage treatment device as claimed in claim 1, wherein the heating device is a centrifugal steam compressor.

3. The steam heating type sewage treatment device as claimed in claim 1, wherein the heating device is a heating pump.

4. The steam heating type sewage treatment device as claimed in claim 1, wherein a steam trap is provided on the second connecting pipe and located close to the heating device, a first steam return valve is disposed between the steam trap and the vacuuming device, and a wastewater collecting tank is disposed below the steam trap.

5. The steam heating type sewage treatment device as claimed in claim 1, wherein a steam filter and a steam control valve are provided between the vacuuming device and the heating device.

6. The steam heating type sewage treatment device as claimed in claim 1, wherein the fourth connecting pipe is further provided with a second steam return valve.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0014] FIG. 1 shows a steam heating type sewage treatment device in accordance with a first embodiment of the present invention;

[0015] FIG. 2 shows a steam heating type sewage treatment device in accordance with a second embodiment of the present invention.

DETAILED DESCRIPTION

[0016] The present invention will be clearer from the following description when viewed together with the accompanying drawings, which show, for purpose of illustrations only, the preferred embodiment in accordance with the present invention.

[0017] Referring to FIG. 1, a steam heating type sewage treatment device in accordance with the present invention comprises: a treatment tank 1, a stirring device 2, a steam heating device 3, a vacuuming device 6, and a heating device 8.

[0018] The treatment tank 1 communicates with a sewage supplying device via a sewage feeding pipe 20, so that sewage can be supplied by the sewage feeding pipe 20 to the treatment tank 1 for treatment.

[0019] The stirring device 2 is disposed in the treatment tank 1, and includes a stirring shaft 21 extending a radial direction of the treatment tank 1. A plurality of blades 22 is fixed to the stirring shaft 21 and radially extends out from the stirring shaft 21. The stirring shaft 21 has one end inserted through the treatment tank 1 and provided with a driving device 23. The driving device 23 rotates the blades 22 by the stirring shaft 21, so as to fully stir the sewage contained in the treatment tank 1.

[0020] The steam heating device 3 is a sleeve structure sleeved onto the outer surface of the treatment tank 1. A steam input pipe 4 and a steam output pipe 5 are provided at two sides of a bottom of the steam heating device 3, so that steam can be fed into the steam heating device 3 via the steam input pipe 4 and discharged out therefrom by the steam output pipe 5.

[0021] The vacuuming device 6 (vacuum pump) is fixed to the top of the treatment tank 1, and connected to the treatment tank 1 via a first connecting pipe 7. During sewage treatment process, the treatment tank 1 is heated by the steam heating device 3, and turned into a negative pressure state by the vacuuming device 6, which reduces the boiling point of the liquid in the treatment tank 1 while accelerating liquid evaporation. Besides, the stirring of the stirring device 2 can also accelerate the evaporation, and the steam is discharged via the first connecting pipe 7. Finally, the solid residue formed after separation of the liquid via heat evaporation will be pushed out of a residue discharging hole 19 which is located at the bottom of the treatment tank 1.

[0022] The improvement of the present invention is explained as follows:

[0023] The heating device 8 is connected to the treatment tank 1 by a second connecting pipe 9. The heating device 8 can be a centrifugal steam compressor. A steam trap 13 is provided on the second connecting pipe 9 and located close to the heating device 8. Between the steam trap 13 and the vacuuming device 6 is provided a first steam return valve 14 which can be a one-way valve to control the steam to enter the steam trap 13 in a one way manner. The steam trap 13 processes the steam passing therethrough to separate steam and liquid, the separated liquid flows directly to a wastewater collecting tank 15 which is disposed below the steam trap 13, and the separated steam is sucked into and pressurized by the centrifugal steam compressor, which substantially increases the temperature of the steam.

[0024] The steam passing through and pressurized and heated by the heating device 8 (the centrifugal steam compressor) enters a steam storage tank 11 via a third connecting pipe 10. A fourth connecting pipe 12 has two ends connected to the steam storage tank 11 and the steam input pipe 4, and is further provided with a second steam return valve 18. When the high temperature steam in the steam storage tank 11 reaches a certain amount and pressure, it will flow through the fourth connecting pipe 12 and the second steam return valve 18 to the steam input pipe 4 in a one-way manner, and will be mixed with the steam input from outside and enter the steam heating device 3 to heat the treatment tank 1. So the cycle repeats, the steam can be recycled to heat the treatment tank 1, which eliminates the use of condensing device for condensing and recycling of the steam, and enables the most effective use of the latent heat of the steam. Compared with the existing technology, the overall design of the present invention is more economical and practical.

[0025] Referring to FIG. 2, a steam heating type sewage treatment device in accordance with another embodiment of the present invention also comprises: a treatment tank 1, a stirring device 2, a steam heating device 3, a steam input pipe 4, a steam output pipe 5, and a vacuuming device 6. The vacuuming device 6 is also connected to the treatment tank 1 with the first connecting pipe 7, and connected to the heating device 8 by the second connecting pipe 9.

[0026] The difference of this embodiment from the previous embodiment is that the heating device 8 can be a heat pump which is used to heat the recycled steam passing therethrough. The heated steam enters the steam storage tank 11 via the third connecting pipe 10. When the high temperature steam in the steam storage tank 11 reaches a certain amount and pressure, it will flow through the fourth connecting pipe 12 and the second steam return valve 18 to the steam input pipe 4 in a one-way manner, and will be fixed with the steam input from outside and enter the steam heating device 3 to heat the treatment tank 1. The second connecting pipe 9 is connected between the vacuuming device 6 and the heating device (the heat pump), and is further provided with a steam filter 16 and a steam control valve 17 to filter floating impurities, sorting water and steam, and control the flow direction of the steam. In actual application, the steam filter 16 and the steam control valve 17 can be replaced with the steam return valve, the steam trap and the wastewater collecting tank used in the previous embodiment. The steam trap 13 and the wastewater collecting tank 15 are used to remove the moisture to protect the heating device 8. The steam trap 13 and the wastewater collecting tank 15 can also be omitted according to needs when other equivalent heating device is used. Therefore, the first steam return valve 14, the steam trap 13, the wastewater collecting tank 15, the steam filter 16 and the steam control valve 17 can be selectively used or replaced with equivalent components according to the requirements of the heating device 8. The selection of the use of the components is determined by practical requirements.

[0027] In application, and at the beginning of the operation of the sewage treatment device, it needs to introduce external high temperature steam which has already been heated into the steam heating device 3 to heat the treatment tank 1, and then the vacuuming device 6 creates a negative pressure state in the treatment tank 1. When the liquid inside the treatment tank 1 reaches a low boiling point corresponding to the pressure, it will be evaporated into steam and sucked out of the treatment tank 1. The steam is then introduced by pipes into the heating device (heating pump) and heated therein to a high temperature, and then reintroduced into the steam input pipe 4 by the steam storage tank 11 and the fourth connecting pipe 12, and finally mixed with the steam input from outside and enter the steam heating device 3 to heat the treatment tank 1. So the cycle repeats, the steam can be recycled to heat the treatment tank 1, as long as the treatment tank 1 still produces steam. With this recycle design, the sewage treatment device can produce recycled steam, therefore, the demand for external steam begin to reduce significantly, which eliminates the use of condensing device for condensing and recycling of the steam, and enables the most effective use of the latent heat of the steam. Compared with the existing technology, the overall design of the present invention is more economical and practical.

[0028] While we have shown and described various embodiments in accordance with the present invention, it is clear to those skilled in the art that further embodiments may be made without departing from the scope of the present invention.