Sludge heat drying dead steam waste heat recovery system

Abstract

The utility model provides a sludge heat drying dead steam waste heat recovery system which comprises a drying machine, the upper end of the drying machine is connected with a heat exchanger through an integrated dust remover, one end of the heat exchanger is connected with a demister, the upper end of the demister is connected with a boiler through an exhaust fan, and the lower end of the demister is connected with a wastewater treatment system. The device has the beneficial effects that exhaust gas generated by sludge heat drying can be treated and finally fed into a waste gas treatment system or a boiler to serve as primary air and secondary air of the boiler to be incinerated. Meanwhile, waste water condensed by the waste steam heat exchanger and the demister is conveyed to the waste water treatment system to be treated, so that the heat energy of the exhaust gas is better utilized. The system is operated under negative pressure, waste gas does not leak out, environmental protection is facilitated, and pollution is not prone to being caused.

Description

Technical Field

[0001] The utility model belongs to the technical field of heat energy recovery and treatment, and in particular relates to a sludge thermal drying exhaust steam waste heat recovery system. Background Art

[0002] Sludge treatment is the process of reducing, stabilizing and harmlessly treating sludge. The higher the degree of sewage treatment, the more sludge residues will need to be treated. Sludge drying is the premise and key to sludge treatment and disposal technology. The existing drying methods generally use disc, paddle, thin layer and other dryers. After the wet sludge is heated by steam, hot oil, electricity, etc., the generated dry sludge is then disposed of independently or collaboratively. The exhaust steam generated is treated by the dust collector and condenser, and the condensed wastewater is sent to the wastewater treatment system, and the exhaust gas is sent to the exhaust gas treatment system or to the boiler as the primary and secondary air of the boiler for incineration. The exhaust gas generated by the dryer is directly cooled by circulating water, and the heat cannot be effectively utilized, which is easy to cause energy waste; and the existing drying system drying technology has high steam consumption, high-quality energy consumption, and high disposal costs. How to effectively utilize the waste heat of exhaust steam to reduce the cost of sludge treatment has become a technical problem that needs to be solved at present. Utility Model Content

[0003] In order to solve the deficiencies of the prior art and reduce energy consumption, the utility model provides a sludge thermal drying exhaust steam waste heat recovery system.

[0004] The purpose of the utility model is achieved through the following technical solutions:

[0005] A sludge thermal drying exhaust steam waste heat recovery system comprises a dryer, the upper end of the dryer is connected to a heat exchanger via an integrated dust collector, one end of the heat exchanger is connected to a demister, the upper end of the demister is connected to a boiler via an exhaust gas fan, and the lower end of the demister is connected to a wastewater treatment system.

[0006] Preferably, the integrated dust collector is connected to the exhaust steam end of the dryer, and the integrated dust collector is connected to the exhaust gas heat exchanger via an electric valve group.

[0007] Preferably, the upper end of the demister is connected to cooling water.

[0008] Preferably, the lower end of the exhaust gas heat exchanger is connected to the wastewater treatment system through a pipeline.

[0009] Preferably, the mud outlet of the dryer is provided with a double-flap air lock, the upper end of the dryer is provided with a mud inlet, and the mud inlet and the mud outlet are respectively provided at two ends of the dryer.

[0010] Preferably, a heat exchange medium inlet is provided at the upper end of the exhaust gas heat exchanger, and a heat exchange medium outlet is provided at the lower end of the exhaust gas heat exchanger.

[0011] The beneficial effects of the utility model are as follows: the utility model can treat the exhaust gas generated by sludge thermal drying and finally send it to the exhaust gas treatment system or to the boiler as the primary and secondary air of the boiler for incineration. At the same time, the waste water condensed from the exhaust steam heat exchanger and the demister is sent to the waste water treatment system for treatment, so that the heat energy of the exhaust gas is better utilized. The system combined with the utility model can operate under negative pressure under the action of the double flap air lock, and the exhaust gas does not leak out, which is beneficial to environmental protection and not easy to cause pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0013] Figure 1 : Schematic diagram of system connection structure of the utility model. DETAILED DESCRIPTION

[0014] The utility model discloses a waste heat recovery system for waste steam from sludge thermal drying, combined with Figure 1 As shown, it includes a dryer 1, a mud outlet 12 of the dryer 1 is provided with a double-flap air lock, a mud inlet 11 is provided at the upper end of the dryer 1, and the mud inlet 11 and the mud outlet 12 are respectively provided at both sides of the dryer 1. A steam inlet and a steam outlet are respectively provided at both ends of the dryer 1.

[0015] The upper end of the dryer 1 is connected to the heat exchanger 3 through the integrated dust collector 2 via the electric valve group 23. In this embodiment, the heat exchanger 3 is an exhaust gas heat exchanger. The exhaust gas intake volume can be better controlled through the electric valve group 23, thereby better coordinating the utilization of the exhaust gas.

[0016] The upper end of the exhaust gas heat exchanger is connected to the demister 4, and the lower end of the exhaust gas heat exchanger is connected to the wastewater treatment system through the exhaust gas outlet 33. The upper end of the exhaust gas heat exchanger is also provided with a heat exchange medium inlet 31, and the lower end of the exhaust gas heat exchanger is provided with a heat exchange medium outlet 32.

[0017] The upper end of the demister 4 is connected to the boiler through the exhaust air fan 5, and the lower end outlet 41 of the demister 4 is connected to the wastewater treatment system. The upper end of the demister 4 is also connected to cooling water 42.

[0018] When in use, the sludge enters the dryer 1 for drying. After the exhaust gas is removed by the integrated dust collector, it enters the exhaust gas heat exchanger. The waste water condensed by the heat exchange medium (which can be water or other) of the exhaust gas heat exchanger enters the waste water treatment system through the lower end of the exhaust gas heat exchanger for further treatment. Part of the exhaust steam will be secondary condensed through the demister, and after the exhaust gas blower 5, the exhaust gas will be sent to the exhaust gas treatment system or sent to the boiler as the primary and secondary air of the boiler for incineration. The waste water part also enters the waste water treatment system for further treatment.

[0019] The entire treatment process can make good use of the exhausted gas, while reducing the use of circulating water, greatly reducing the treatment cost, and is highly practical.

[0020] Finally, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0021] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A sludge thermal drying exhaust steam waste heat recovery system, characterized by: It includes a dryer, the upper end of which is connected to a heat exchanger via an integrated dust collector, one end of the heat exchanger is connected to a demister, the upper end of the demister is connected to a boiler via an exhaust gas fan, and the lower end of the demister is connected to a wastewater treatment system.

2. A sludge thermal drying exhaust steam waste heat recovery system as claimed in claim 1, characterized in that: The integrated dust collector is connected to the exhaust steam end of the dryer, and the integrated dust collector is connected to the exhaust gas heat exchanger through an electric valve group.

3. A sludge thermal drying exhaust steam waste heat recovery system as claimed in claim 2, characterized in that: The upper end of the demister is connected with cooling water.

4. A sludge thermal drying exhaust steam waste heat recovery system as claimed in claim 3, characterized in that: The lower end of the exhaust gas heat exchanger is connected to the wastewater treatment system through a pipeline.

5. A sludge thermal drying exhaust steam waste heat recovery system as claimed in claim 4, characterized in that: The mud outlet of the dryer is provided with a double-flap air lock, the upper end of the dryer is provided with a mud inlet, and the mud inlet and the mud outlet are respectively provided at two ends of the dryer.

6. A sludge thermal drying exhaust steam waste heat recovery system as claimed in claim 5, characterized in that: The exhaust gas heat exchanger is provided with a heat exchange medium inlet at the upper end, and a heat exchange medium outlet at the lower end.

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