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 spray washing cooling tower through an integrated dust remover, and the upper end of the spray washing cooling tower is connected with a waste gas treatment system through a steam-water separator. And the spraying, washing and cooling tower is also communicated with a hot water circulating pipeline of the drying machine through a heat pump unit. The waste steam heat energy recycling device has the beneficial effects that waste steam heat energy generated by sludge heat drying can be recycled, waste heat of waste steam is effectively utilized, and meanwhile, the consumption of circulating water is reduced; the sludge heat drying steam consumption is reduced, and the sludge treatment cost is also reduced; the system runs 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 drying, also known as sludge dehydration, refers to the process of removing most of the water content from sludge through infiltration or evaporation, generally referring to the use of self-evaporation facilities such as sludge drying fields (beds). After the sludge is concentrated, the water content of the sludge is further reduced by physical methods to facilitate the transportation, accumulation, utilization or further treatment of the sludge. Sludge drying is the premise and key to sludge treatment and disposal technology. At present, the commonly used drying methods are usually carried out by disc, paddle, thin layer and other drying machines. After the wet sludge is heated by steam, hot oil, electricity, etc., the dry sludge produced is then disposed of independently or collaboratively. The exhaust steam generated in this process will be treated by dust collectors and condensers, the condensed wastewater will be sent to the wastewater treatment system, and the exhaust steam will be sent to the waste gas treatment system or sent to the boiler as the primary and secondary air of the boiler for incineration. The exhaust steam generated by the dryer will be directly cooled by circulating water, and its heat will not be effectively utilized, which is easy to cause energy waste; at the same time, the existing drying system has high drying steam consumption, high-quality energy consumption, and high disposal costs. How 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 spray washing and cooling tower via an integrated dust collector, the upper end of the spray washing and cooling tower is connected to an exhaust gas treatment system via a steam-water separator, and the spray washing and cooling tower is also connected to the hot water circulation pipeline of the dryer via a heat pump unit.

[0006] Preferably, the spray washing cooling tower is connected to the heat pump unit through a wastewater circulation pump, and the other end of the heat pump unit is connected to the hot water circulation pipeline of the dryer through a hot water circulation pump.

[0007] Preferably, a wastewater outlet connected to a wastewater treatment system is provided at the bottom of the spray washing and cooling tower.

[0008] Preferably, a wastewater end is provided at the bottom of the steam-water separator, and the wastewater end is connected to a wastewater treatment system.

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

[0010] Preferably, a first hot water circulation pump is provided on the hot water circulation pipeline of the drying machine.

[0011] The beneficial effects of the utility model are embodied in the following aspects: the utility model can recycle the heat energy of the exhaust steam generated by the thermal drying of sludge, effectively utilize the waste heat of the exhaust steam, and at the same time reduce the consumption of circulating water; reduce the steam consumption of the thermal drying of sludge, and also reduce the cost of sludge disposal; the system of the utility model operates under negative pressure, 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. The dryer can be a disc, thin layer, paddle or other dryer as in the prior art. The upper and lower ends of the dryer 1 are respectively provided with a mud inlet 11 and a mud outlet 12. The mud inlet 11 and the mud outlet 12 are respectively provided at the two ends of the dryer. The mud outlet 12 is further provided with a double-flap air lock, which prevents the exhaust gas in the dryer from leaking out, is beneficial to environmental protection, and is not easy to cause pollution.

[0015] Different from the prior art, the upper end of the drying machine 1 is connected to the spray washing cooling tower 2 through the integrated dust collector 5. In order to improve efficiency, an electric valve group is arranged between the integrated dust collector 5 and the spray washing cooling tower 2 for control. The exhaust gas entering the spray washing cooling tower from the integrated dust collector 5 can remove impurities and pollutants in the exhaust gas, and the temperature of the exhaust gas can also be effectively reduced after spraying treatment. The upper end of the spray washing cooling tower 2 is connected to a vacuum pump 23, and the other end of the vacuum pump 23 is connected to the exhaust gas treatment system through a steam-water separator 4. The bottom of the spray washing cooling tower 2 is provided with a wastewater port 21 connected to the wastewater treatment system. The exhaust gas entering the spray washing cooling tower 2 enters the exhaust gas treatment system for treatment after spraying and cooling, and the wastewater generated by the spray washing cooling tower 2 enters the wastewater treatment system through the wastewater port 21 for treatment. Correspondingly, a wastewater end is arranged at the bottom of the steam-water separator 4, and the wastewater end is connected to the wastewater treatment system.

[0016] The spray washing cooling tower 2 is also connected to the hot water circulation pipeline of the drying machine through the heat pump unit 3. The heat pump unit 3 is provided with one or more groups as needed.

[0017] Furthermore, the spray washing cooling tower 2 is connected to the heat pump unit 3 through the wastewater circulation pump 22. The spray pipeline of the spray washing cooling tower 2 is heat exchanged by the heat pump unit 3 and then continues to enter the spray washing cooling tower 2 to absorb the exhaust steam heat, thereby circulating.

[0018] The other end of the heat pump unit 3 is connected to the hot water circulation pipeline of the dryer through a hot water circulation pump 31. A first hot water circulation pump 13 is provided on the hot water circulation pipeline of the dryer. The hot water circulation pipeline of the dryer flows back to the hot water main pipe through the heat pump unit after the hot water absorbed by the heat pump unit to provide heat to the disc, blade, thin layer and other dryers. The hot water after providing heat is pumped to the hot water circulation pump on each branch pipe through the high-temperature hot water circulation pump on the main pipe to enter the heat pump unit (one or more groups) to absorb heat, and the cycle repeats. The system of the utility model can recycle the exhaust steam heat energy generated by sludge thermal drying, effectively utilize the waste heat of the exhaust gas, reduce the circulation water consumption, reduce the steam consumption of sludge thermal drying, and also reduce the sludge disposal cost.

[0019] 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.

[0020] 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 spray washing and cooling tower through an integrated dust collector, the upper end of which is connected to an exhaust gas treatment system through a steam-water separator, and the spray washing and cooling tower is also connected to the hot water circulation pipeline of the dryer through a heat pump unit.

2. A sludge thermal drying exhaust steam waste heat recovery system as claimed in claim 1, characterized in that: The spray washing cooling tower is connected to the heat pump unit through a wastewater circulation pump, and the other end of the heat pump unit is connected to the hot water circulation pipeline of the drying machine through a hot water circulation pump.

3. A sludge thermal drying exhaust steam waste heat recovery system as claimed in claim 2, characterized in that: A wastewater outlet connected to a wastewater treatment system is provided at the bottom of the spray washing and cooling tower.

4. A sludge thermal drying exhaust steam waste heat recovery system as claimed in claim 3, characterized in that: A wastewater end is arranged at the bottom of the steam-water separator, and the wastewater end is connected to a wastewater treatment system.

5. A sludge thermal drying exhaust steam waste heat recovery system as claimed in claim 4, characterized in that: The lower end of the dryer is provided with a mud outlet, and the mud outlet 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: A first hot water circulation pump is arranged on the hot water circulation pipeline of the drying machine.

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