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 a water ring vacuum pump, one end of the heat exchanger is connected with a steam-water separator, one end of the water ring vacuum pump is connected with the steam-water separator, and the other end of the water ring vacuum pump is connected with the steam-water separator. And the upper end of the steam-water separator is connected with a waste gas treatment system through a waste steam fan. The waste steam heat recovery device has the beneficial effects that the waste steam heat energy generated by sludge heat drying can be recycled, the waste heat of the 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] With the acceleration of my country's urbanization process, the sewage treatment rate has increased year by year, and the output of wet sludge has also increased sharply. The principles and requirements of sludge treatment in my country are to achieve "reduction, stabilization, harmlessness and resource utilization". Sludge drying is the premise and key to sludge treatment and disposal technology. The existing drying methods basically 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. Among them, the exhaust steam generated is treated by the dust collector and condenser, and the condensed wastewater will be sent to the wastewater treatment system, and the exhaust gas will be sent to the exhaust gas treatment system or sent to the boiler as the primary and secondary air incineration of the boiler. The exhaust gas generated by the dryer is usually directly cooled by circulating water, and its heat cannot 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 cost. 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] The sludge thermal drying exhaust steam waste heat recovery system comprises a dryer, the upper end of the dryer is connected to a heat exchanger through a water ring vacuum pump, one end of the heat exchanger is connected to a steam-water separator, one end of the water ring vacuum pump is connected to a steam-water separator, and the upper end of the steam-water separator is connected to a waste gas treatment system through an exhaust steam fan.

[0006] Preferably, an integrated dust collector is connected to the exhaust steam end of the dryer, and the integrated dust collector is connected to the water ring vacuum pump via an electric valve group.

[0007] Preferably, the water ring vacuum pump is connected to the heat exchanger via a pressure pump.

[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, 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, the heat exchanger is provided with a water inlet and a water outlet.

[0011] Preferably, a water seal pipe is provided in the middle of the steam-water separator.

[0012] 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 gas, 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

[0013] 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.

[0014] Figure 1 : Schematic diagram of system connection structure of the utility model. DETAILED DESCRIPTION

[0015] 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 upper end of the dryer 1 is provided with a mud inlet 13, the lower end of the dryer 1 is provided with a mud outlet 14, the mud outlet 14 is provided with a double-flap air lock, and the double-flap air lock allows the system to maintain a vacuum degree. The mud inlet 13 and the mud outlet 14 are respectively arranged at both ends of the dryer 1. The two ends of the dryer are respectively provided with a steam inlet 12 and a steam outlet 11. The type of the dryer 1 can be a disc, paddle, thin layer or other dryer.

[0016] The exhaust steam end of the dryer 1 is connected to an integrated dust collector, and the integrated dust collector is connected to the water ring vacuum pump 2 through an electric valve group 21. In this embodiment, the water ring vacuum pump 2 is a high-temperature type. One end of the water ring vacuum pump 2 is connected to the heat exchanger 3 through a pressure pump 23. The heat exchanger 3 can recover energy, and the heat exchanger 3 is provided with a water inlet end and a water outlet end.

[0017] One end of the heat exchanger 3 is connected to the steam-water separator 4, and a water seal pipe is arranged in the middle of the steam-water separator 4. By using the water seal pipe, liquid can be automatically drained when the height exceeds the steam-water separator, so as to avoid the water being drained in time and filling the steam-water separator.

[0018] One end of the water ring vacuum pump 2 is connected to the steam-water separator 4, and the upper end of the steam-water separator 4 is connected to the waste gas treatment system through the exhaust steam blower 5. A waste water end is provided at the bottom of the steam-water separator 4, and the waste water end is connected to the waste water treatment system.

[0019] In order to better understand the present invention, the operating recovery principle of the system is described below:

[0020] The dryer 1 heats the wet sludge by steam, and the dry sludge produced is first passed through a double flap air lock (to maintain the vacuum degree), and then transported for separate or coordinated disposal. The exhaust steam produced is dedusted by an integrated dust collector, and the exhaust steam volume is adjusted by an electric valve group 21. The high-temperature water ring vacuum pump 2 pressurizes and condenses the exhaust steam produced by the dryer drying sludge into hot water, so that the temperature of the condensed hot water is increased. The condensed hot water is cooled by the heat exchanger 3 and then sent to the steam-water separator 4. It is sent to the exhaust gas treatment system or to the boiler as the primary and secondary air of the boiler for incineration through the exhaust steam fan 5. The medium introduced into the heat exchanger 3, such as low-temperature hot water, can recover the heat in the condensed water. This system reduces the steam consumption of the wet sludge while reducing the disposal cost of the sludge. The whole system is negative pressure operation, and the exhaust gas is not easy to leak, which is beneficial to environmental protection, reduces environmental pollution, and is highly practical.

[0021] 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.

[0022] 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. 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 a water ring vacuum pump, one end of the heat exchanger is connected to a steam-water separator, one end of the water ring vacuum pump is connected to a steam-water separator, and the upper end of the steam-water separator is connected to an exhaust gas treatment system via an exhaust steam fan.

2. The sludge thermal drying exhaust steam waste heat recovery system according to claim 1, characterized in that: An integrated dust collector is connected to the exhaust steam end of the dryer, and the integrated dust collector is connected to the water ring vacuum pump through an electric valve group.

3. The sludge thermal drying exhaust steam waste heat recovery system according to claim 2, characterized in that: The water ring vacuum pump is connected to the heat exchanger through a pressure pump.

4. The sludge thermal drying exhaust steam waste heat recovery system according to 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. The sludge thermal drying exhaust steam waste heat recovery system according to 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. The sludge thermal drying exhaust steam waste heat recovery system according to claim 5, characterized in that: The heat exchanger is provided with a water inlet end and a water outlet end.

7. The sludge thermal drying exhaust steam waste heat recovery system according to claim 6, characterized in that: A water seal pipe is arranged in the middle of the steam-water separator.

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