Waste heat recycling device for incinerator

Abstract

The utility model provides a waste heat recycling device for an incinerator in the technical field of waste heat recovery. The system comprises a steam generation unit, an air preheating unit and a water preheating unit which are sequentially connected with an incinerator. The heat exchanger comprises a steam heat exchanger, a fresh air preheating heat exchanger and a water preheating heat exchanger; the steam generation unit comprises a first shell and a steam heat exchanger, and steam is discharged from an outlet of a pipeline in the steam heat exchanger; the air preheating unit comprises a second shell and a fresh air preheating heat exchanger, air is introduced into an inlet of a pipeline in the fresh air preheating heat exchanger, and an outlet of the pipeline in the fresh air preheating heat exchanger communicates with the incinerator; the water preheating unit comprises a third shell and a water preheating heat exchanger, and an inlet of a pipeline in the water preheating heat exchanger is connected with a water source. According to the waste heat recovery device, waste heat in waste gas is effectively recovered through three-stage heat exchange in a specific sequence and is used for generating energy in other forms, and the utilization efficiency of waste heat energy in the waste gas is improved to the maximum extent.

Description

Technical Field

[0001] The utility model relates to the technical field of waste heat recovery, and in particular to a waste heat recovery and utilization device for an incinerator. Background Art

[0002] At present, incinerators are widely used in VOCs treatment, industrial production and other fields. However, the waste gas generated by the incinerator contains a large amount of heat energy, and the temperature can reach over 800 degrees Celsius. If it cannot be effectively recycled, it will cause energy waste and environmental pollution. Therefore, it is of great significance to develop an efficient waste heat recovery and utilization device for incinerators.

[0003] Patent CN110230820A discloses a waste heat recovery system for VOC waste gas incineration, which uses a two-stage heat exchange device. The final waste gas temperature is still as high as more than 200 degrees Celsius, and the waste heat recovery efficiency is still not ideal.

[0004] Although patent CN214468738U adopts three-stage heat exchange, the flue gas temperature it treats is only 120-180 degrees Celsius, and the energy recovery efficiency is low. Utility Model Content

[0005] In order to solve the problem of low efficiency of existing waste heat recovery, the utility model provides a waste heat recovery and utilization device for an incinerator.

[0006] The waste heat recovery and utilization device for an incinerator includes a heat exchanger, which is characterized in that it also includes a steam generation unit 2, an air preheating unit 3 and a water preheating unit 4 connected to the incinerator in sequence; the heat exchanger includes a steam heat exchanger, a fresh air preheating heat exchanger, and a water preheating heat exchanger;

[0007] The steam generating unit 2 comprises a first shell, a steam heat exchanger is built in the first shell, and steam is discharged from an outlet of an internal pipeline of the steam heat exchanger;

[0008] The air preheating unit 3 includes a second shell, a fresh air preheating heat exchanger is built in the second shell, air is introduced into the inlet of the internal pipeline of the fresh air preheating heat exchanger, and the outlet of the internal pipeline of the fresh air preheating heat exchanger is connected to the incinerator 1;

[0009] The water preheating unit 4 includes a third shell, a water preheating heat exchanger is built in the third shell, an inlet of an internal pipeline of the water preheating heat exchanger is connected to a water source, and an outlet of the internal pipeline of the water preheating heat exchanger is connected to an inlet of an internal pipeline of the steam heat exchanger;

[0010] The first shell is connected to the incinerator 1, the first shell is connected to the second shell, and the second shell is connected to the third shell.

[0011] Preferably, the outlet of the internal pipeline of the steam heat exchanger is connected to the gas-liquid separator 21, the liquid outlet of the gas-liquid separator 21 is connected to the inlet of the internal pipeline of the steam heat exchanger, and the gas outlet of the gas-liquid separator 21 discharges steam. The gas-liquid separator 21 can improve the steam quality.

[0012] Preferably, the steam heat exchanger, the fresh air preheating heat exchanger, and the water preheating heat exchanger are all finned heat exchangers, which are placed in their respective shells, and the exhaust gas filled in the shells is in full contact with the heat exchangers in the shells for heat exchange.

[0013] Preferably, air is introduced into the inlet of the internal pipeline of the fresh air preheating heat exchanger through a fan.

[0014] Preferably, the inlet of the internal pipeline of the water preheating heat exchanger is connected to the water source through a water pump.

[0015] Preferably, two or more steam heat exchangers are connected in series or in parallel in the first shell.

[0016] Preferably, at least three steam heat exchangers are connected in parallel in the first shell, and the steam heat exchangers are staggered to form an S-shaped gas flow channel, so that the flue gas can contact the heat exchanger gas more fully.

[0017] Preferably, the waste heat recovery and utilization device for an incinerator further includes a chimney 5 , and the third shell is connected to the chimney 5 .

[0018] Preferably, air is introduced into the inlet of the internal pipeline of the fresh air preheating heat exchanger through a fan.

[0019] Preferably, a condensate discharge outlet is provided on the pipeline between the third shell and the chimney and / or on the third shell.

[0020] Preferably, the inner surface of the first shell and / or the second shell and / or the third shell is provided with an anti-corrosion coating.

[0021] The utility model first uses the waste heat of the high-temperature flue gas of more than 800 degrees Celsius of the incinerator to generate high-temperature steam, and the flue gas temperature drops to 200-300 degrees Celsius; then, the waste heat is continued to be used to preheat the air, and the preheated air is input into the incinerator, which can improve the combustion efficiency of the incinerator, further improve the energy efficiency utilization rate of the flue gas waste heat, and the flue gas temperature drops to 120-150 degrees Celsius; finally, the flue gas is used to preheat the water of the steam generating unit, and the flue gas waste heat is further used to improve the working efficiency of the steam generating unit. At this time, the temperature of the exhaust flue gas is 70-80 degrees Celsius. If it is considered necessary, other technologies can be used to further recycle and utilize this part of the flue gas preheating.

[0022] The advantages of the present invention are as follows: the utility model provides a waste heat recovery and utilization device for an incinerator, which, through three-stage heat exchange in a specific order, effectively recovers the waste heat in the exhaust gas and uses it to generate other forms of energy, thereby maximizing the utilization efficiency of the waste heat energy in the exhaust gas and reducing energy waste and environmental pollution. The system has broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the structure of the utility model;

[0024] Among them: 1-incinerator; 2-steam generating unit; 21-gas-liquid separator; 3-air preheating unit; 4-water preheating unit; 5-chimney. DETAILED DESCRIPTION

[0025] like Figure 1 As shown, the waste heat recovery and utilization device for an incinerator includes a heat exchanger, a steam generating unit, an air preheating unit, and a water preheating unit; the heat exchanger includes a steam heat exchanger, a fresh air preheating heat exchanger, and a water preheating heat exchanger.

[0026] The steam generating unit comprises a first shell, a steam heat exchanger is built in the first shell, and an outlet of an internal pipeline of the steam heat exchanger discharges steam.

[0027] The air preheating unit includes a second shell, a fresh air preheating heat exchanger is built in the second shell, air is introduced into the inlet of the internal pipeline of the fresh air preheating heat exchanger, and the outlet of the internal pipeline of the fresh air preheating heat exchanger is connected to the incinerator.

[0028] The water preheating unit includes a third shell, a water preheating heat exchanger is built in the third shell, an inlet of the internal pipeline of the water preheating heat exchanger is connected to the water source, and an outlet of the internal pipeline of the water preheating heat exchanger is connected to the inlet of the internal pipeline of the steam heat exchanger.

[0029] The incinerator is connected to the first shell through a pipeline, the first shell is connected to the second shell, and the second shell is connected to the third shell.

[0030] The utility model recovers the flue gas by preheating in the order of the steam generation unit 2, the air preheating unit 3 and the water preheating unit 4, so as to maximize the recovery rate of the flue gas.

[0031] Preferably, the outlet of the internal pipeline of the steam heat exchanger is connected to the gas-liquid separator 21, the liquid outlet of the gas-liquid separator is connected to the inlet of the internal pipeline of the steam heat exchanger, and the gas outlet of the gas-liquid separator discharges steam.

[0032] Preferably, the steam heat exchanger, the fresh air preheating heat exchanger, and the water preheating heat exchanger are all finned heat exchangers.

[0033] Preferably, air is introduced into the inlet of the internal pipeline of the fresh air preheating heat exchanger through a fan.

[0034] Preferably, the inlet of the internal pipeline of the water preheating heat exchanger is connected to the water source through a water pump.

[0035] Preferably, two or more steam heat exchangers are connected in series or in parallel in the first shell. For example, four steam heat exchangers are connected in parallel in the first shell, and the steam heat exchangers are staggered to form an S-shaped gas flow channel.

[0036] Preferably, the waste heat recovery device for an incinerator further includes a chimney, and the third shell is connected to the chimney 5 .

[0037] Generally, water vapor in the flue gas is easily condensed into liquid water at the third stage heat exchange where the temperature is relatively low. In order to prevent the water vapor in the flue gas from condensing into liquid water and remaining in the device, preferably, a condensate discharge port is provided on the pipeline between the third shell and the chimney and / or on the third shell.

[0038] Preferably, the inner surfaces of the first shell and / or the second shell and / or the third shell are coated with a fluorine-resistant coating, such as a carbon fiber layer.

[0039] When the utility model is working, the waste gas of more than 800 degrees Celsius generated after the combustion of the incinerator enters the first shell of the steam generation unit through the pipeline, and fully exchanges heat with the steam heat exchanger to generate high-temperature steam. At this time, the waste gas temperature can be reduced to 200-300 degrees Celsius; then the waste gas passes through the fresh air preheating heat exchanger in the second shell, and the waste gas temperature can be reduced to 120-150 degrees Celsius; finally, it passes through the water preheating heat exchanger in the third shell, and the waste gas temperature can be reduced to 70-80 degrees Celsius. At this time, if it is considered necessary, other technologies can be used to further recycle and reuse this part of the flue gas preheating, or it can be directly discharged through the chimney 5.

Claims

1. A waste heat recovery and utilization device for an incinerator, comprising a heat exchanger, characterized in that: It also includes a steam generation unit (2), an air preheating unit (3) and a water preheating unit (4) which are sequentially connected to the incinerator; the heat exchanger includes a steam heat exchanger, a fresh air preheating heat exchanger and a water preheating heat exchanger; The steam generating unit (2) comprises a first shell, a steam heat exchanger is built in the first shell, and steam is discharged from an outlet of an internal pipeline of the steam heat exchanger; The air preheating unit (3) comprises a second shell, a fresh air preheating heat exchanger is built in the second shell, air is introduced into an inlet of an internal pipeline of the fresh air preheating heat exchanger, and an outlet of the internal pipeline of the fresh air preheating heat exchanger is connected to the incinerator (1); The water preheating unit (4) comprises a third shell, a water preheating heat exchanger is built in the third shell, an inlet of an internal pipeline of the water preheating heat exchanger is connected to a water source, and an outlet of the internal pipeline of the water preheating heat exchanger is connected to an inlet of an internal pipeline of the steam heat exchanger; The first shell is connected to the incinerator (1), the first shell is connected to the second shell, and the second shell is connected to the third shell.

2. The waste heat recovery device for an incinerator according to claim 1, characterized in that: The outlet of the internal pipeline of the steam heat exchanger is connected to the gas-liquid separator (21), the liquid outlet of the gas-liquid separator (21) is connected to the inlet of the internal pipeline of the steam heat exchanger, and the gas outlet of the gas-liquid separator (21) discharges steam.

3. The waste heat recovery device for an incinerator according to claim 1 or 2, characterized in that: Two or more steam heat exchangers are connected in series or in parallel in the first shell.

4. The waste heat recovery device for an incinerator according to claim 3 is characterized in that: At least three steam heat exchangers are connected in parallel in the first shell, and the steam heat exchangers are staggered to form an S-shaped gas flow channel.

5. The waste heat recovery device for an incinerator according to claim 3, characterized in that: The inlet of the internal pipeline of the water preheating heat exchanger is connected to the water source through a water pump.

6. The waste heat recovery device for an incinerator according to claim 3 is characterized in that: The steam heat exchanger, fresh air preheating heat exchanger and water preheating heat exchanger all use finned heat exchangers.

7. The waste heat recovery device for an incinerator according to claim 3, characterized in that: The waste heat recovery and utilization device for an incinerator further comprises a chimney (5), and the third shell is connected to the chimney (5).

8. The waste heat recovery device for an incinerator according to claim 3, characterized in that: Air is introduced into the inlet of the internal pipeline of the fresh air preheating heat exchanger through the fan.

9. The waste heat recovery device for an incinerator according to claim 7, characterized in that: A condensed water outlet is arranged on the pipeline between the third shell and the chimney and / or on the third shell.

10. The waste heat recovery device for an incinerator according to claim 3, characterized in that: The inner surfaces of the first shell and / or the second shell and / or the third shell are provided with an anti-corrosion coating.

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