Tube bundle waste steam deep comprehensive utilization system

Abstract

The utility model provides a tube bundle waste steam deep comprehensive utilization system which comprises a tube bundle drying machine, a waste gas outlet of the tube bundle drying machine is connected with a corn steep liquor evaporation and concentration system, a waste gas outlet of the corn steep liquor evaporation and concentration system is connected with a gas inlet of a cooler, and a water inlet of the cooler is connected with a water tank. An air outlet of the cooler is communicated with the outside, a water outlet of the cooler is connected with the preheater, the preheater is provided with an air inlet, a water outlet of the preheater is connected to the water tank in a backflow mode, an air outlet of the preheater is connected to an inlet of the heat exchanger, and the other inlet of the heat exchanger is connected with a steam pipeline. And an air outlet of the heat exchanger is connected to a starch airflow drying process. According to the utility model, the waste steam discharged into the atmosphere does not contain water vapor, and meanwhile, the heat in the waste steam is deeply utilized to heat the inlet air of the starch airflow drying system, so that the steam consumption of the starch airflow drying system is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of waste steam and waste heat utilization, in particular to a tube bundle waste steam deep comprehensive utilization system. Background Art

[0002] At present, the exhaust steam from the tube bundle dryer of almost all starch production enterprises is directly discharged into the atmosphere after being utilized by the corn pulp evaporation and concentration system. Since the heat of the exhaust steam is not fully utilized, the exhaust gas discharged into the atmosphere contains a large amount of water vapor, which looks like a large amount of white smoke discharged into the air, which does not meet environmental protection requirements. Since the outdoor temperature is lower than the exhaust steam temperature, the water vapor in the exhaust steam condenses into water droplets and falls around the exhaust port. In winter, it will directly cause a large amount of ice to form on the roof, affecting the structural safety of the workshop;

[0003] The exhaust steam from the tube bundle dryer discharged into the atmosphere can be fully utilized for heat and "de-whitening" in accordance with environmental protection requirements, which is a difficult problem that starch processing companies urgently need to solve. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model provides a tube bundle waste steam deep comprehensive utilization system, which utilizes a cooler to condense water vapor in the waste steam after the heat is fully utilized by the corn slurry evaporation and concentration system, and at the same time further utilizes the heat in the waste steam, thereby fully utilizing the waste heat to reduce energy consumption.

[0005] The utility model provides a technical solution: a tube bundle exhaust steam deep comprehensive utilization system, comprising a tube bundle dryer, the exhaust gas outlet of the tube bundle dryer is connected to a corn slurry evaporation and concentration system, the exhaust gas outlet of the corn slurry evaporation and concentration system is connected to an air inlet of a cooler, the water inlet of the cooler is connected to a water tank, the air outlet of the cooler is communicated with the outside, the water outlet of the cooler is connected to a preheater, the preheater is provided with an air inlet, the water outlet of the preheater is refluxed and connected to the water tank, the air outlet of the preheater is connected to an inlet of a heat exchanger, the other inlet of the heat exchanger is connected to a steam pipeline, and the air outlet of the heat exchanger is connected to an airflow drying process of starch.

[0006] Furthermore, a water outlet of the water tank is connected to a delivery pipeline of a cooler and a circulating pump is provided on the pipeline, and an inlet of the water tank is connected to a water delivery pipeline.

[0007] Furthermore, the cooler is provided with a condensed water outlet, which is connected to a workshop recovery process.

[0008] Furthermore, the heat exchanger is provided with a steam condensate outlet, and the steam condensate outlet is connected to the boiler room.

[0009] Furthermore, the heat exchanger is a finned heat exchanger.

[0010] Beneficial effects of the utility model:

[0011] (1) The heat of the exhaust gas from the tube bundle dryer is first fully utilized by the corn syrup evaporation system, and then the cold water is preheated by the cooler, which almost completely utilizes the heat in the exhaust gas from the tube bundle dryer, ensuring that the exhaust gas from the tube bundle dryer discharged into the atmosphere does not contain water vapor;

[0012] (2) The cooled waste steam condensate is returned to production for use, reducing the amount of fresh water used;

[0013] (3) The heated hot water is then sent to the preheater of the airflow drying system to preheat the incoming air, thereby reducing the steam consumption of the starch airflow drying system. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the utility model;

[0015] In the figure: 1 - tube bundle dryer, 2 - corn slurry evaporation and concentration system, 3 - cooler, 4 - water tank, 5 - preheater, 6 - heat exchanger, 7 - circulation pump. DETAILED DESCRIPTION

[0016] The present invention is further described below in conjunction with specific implementation methods, wherein the accompanying drawings are only used for exemplary descriptions and represent only schematic diagrams rather than actual drawings, and should not be understood as limiting the present invention. In order to better illustrate the specific implementation methods of the present invention, some parts of the accompanying drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the accompanying drawings may be omitted. Based on the specific implementation methods of the present invention, all other specific implementation methods obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0017] like Figure 1 A tube bundle exhaust steam deep comprehensive utilization system shown in the figure comprises a tube bundle dryer 1, the exhaust gas outlet of the tube bundle dryer 1 is connected to a corn slurry evaporation and concentration system 2, the exhaust gas outlet of the corn slurry evaporation and concentration system 2 is connected to the air inlet of a cooler 3, the water inlet of the cooler 3 is connected to a water tank 4, the air outlet of the cooler 3 is communicated with the outside, the water outlet of the cooler 3 is connected to a preheater 5, an air inlet is provided on the preheater 5, the water outlet of the preheater 5 is refluxed and connected to the water tank 4, the air outlet of the preheater 5 is connected to the inlet of a heat exchanger 6, the other inlet of the heat exchanger 6 is connected to a steam pipe, and the air outlet of the heat exchanger 6 is connected to the airflow drying process of starch.

[0018] The water outlet of the water tank 4 is connected to the delivery pipeline of the cooler 3 and a circulation pump 7 is arranged on the water outlet of the water tank 4. The inlet of the water tank 4 is connected to a water delivery pipeline.

[0019] The cooler 3 is provided with a condensed water outlet, which is connected to a workshop recovery process.

[0020] The heat exchanger 6 is provided with a steam condensate outlet, and the steam condensate outlet is connected to the boiler room. The heat exchanger 6 is a finned heat exchanger.

[0021] Taking a starch production enterprise that processes 1,000 tons of corn per day as an example, after the waste steam at 78-82°C from the tube bundle dryer is utilized by the corn slurry evaporation and concentration system, there is still 30-40% of heat remaining. Fresh water is added to the water tank and input into the cooler through a circulating pump to cool the tube bundle waste steam. The water vapor in the waste steam is condensed through the cooler. The tail gas without water vapor after treatment is directly discharged into the atmosphere. The condensed liquid is returned to the process for use. Fresh water is added to the cooler at the beginning. The water heated by the cooler is sent to the preheater of the starch airflow drying system for preheating the incoming fresh air. The water cooled by the preheater returns to the water tank and is then sent to the cooler to cool the tail gas of the corn slurry evaporation and concentration system. The reciprocating cycle is repeated. The air preheated by the preheater passes through the heat exchanger and is heated by steam. After the air is heated, it is sent to the starch airflow drying system for use. The utility model fully utilizes the heat of the waste steam of the tube bundle dryer and achieves the purpose of discharging no water vapor in the tail gas.

[0022] The heat of the exhaust steam from the tube bundle dryer is deeply reused to heat hot water, which in turn heats the air intake of the airflow drying system. According to preliminary calculations, the airflow drying system can save 3 tons of fresh steam per hour.

[0023] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A system for comprehensive utilization of exhaust steam from a tube bundle, characterized by: The invention comprises a tube bundle dryer (1), wherein the exhaust gas outlet of the tube bundle dryer (1) is connected to a corn slurry evaporation and concentration system (2), the exhaust gas outlet of the corn slurry evaporation and concentration system (2) is connected to the air inlet of a cooler (3), the water inlet of the cooler (3) is connected to a water tank (4), the air outlet of the cooler (3) is communicated with the outside, the water outlet of the cooler (3) is connected to a preheater (5), the preheater (5) is provided with an air inlet, the water outlet of the preheater (5) is refluxed and connected to the water tank (4), the air outlet of the preheater (5) is connected to the inlet of a heat exchanger (6), the other inlet of the heat exchanger (6) is connected to a steam pipeline, and the air outlet of the heat exchanger (6) is connected to an air flow drying process of starch.

2. The system for comprehensive utilization of exhaust steam from a tube bundle according to claim 1, characterized in that: The water outlet of the water tank (4) is connected to the delivery pipeline of the cooler (3) and a circulating pump (7) is arranged on it, and the inlet of the water tank (4) is connected to a water delivery pipeline.

3. The system for comprehensive utilization of exhaust steam from a tube bundle according to claim 1, characterized in that: The cooler (3) is provided with a condensed water outlet, and the condensed water outlet is connected to a workshop recovery process.

4. The system for comprehensive utilization of exhaust steam from a tube bundle according to claim 1, characterized in that: The heat exchanger (6) is provided with a steam condensate outlet, and the steam condensate outlet is connected to the boiler room.

5. The system for comprehensive utilization of exhaust steam from a tube bundle according to claim 1, characterized in that: The heat exchanger (6) is a fin-type heat exchanger.

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