Dangerous waste incineration line dry type deslagging system

Abstract

The utility model discloses a dry type deslagging system of a hazardous waste incineration line, which adopts a water cooling mode to cool slag of a hazardous waste incineration furnace. Incineration slag enters the dry-type slag discharging system from a slag falling opening of a secondary combustion chamber of the hazardous waste rotary kiln, and cooling water of the dry-type slag discharging system serves as feed water of the waste heat boiler. The waste heat boiler feeds water to absorb sensible heat of the incinerator slag, the sensible heat is pumped back to the deaerator of the incinerator thermodynamic system, use of deoxygenated steam is reduced, and the heat efficiency of the hazardous waste incineration system is improved. The dry-type deslagging system is provided with a negative-pressure exhaust pipeline, and waste gas collection and negative-pressure maintenance are carried out on the dry-type deslagging system through a draught fan of the hazardous waste incineration flue gas purification system. And the cooled slag enters a slag bin and waits for outward transportation treatment.

Description

Technical Field

[0001] The utility model belongs to the field of hazardous waste incineration, and specifically relates to a dry slag discharging system for a hazardous waste incineration line. Background Art

[0002] Hazardous waste incineration lines usually use rotary kilns and secondary combustion chambers to dispose of hazardous wastes. The incineration system will produce incineration residues. The incineration residues enter the water-sealed scraper slag discharger through the secondary combustion chamber hopper interface. The water-sealed scraper slag discharger tank is filled with cooling water. The residues cool rapidly after entering the water and are continuously output by the water-sealed scraper slag discharger. The slag discharger can automatically discharge slag, and the slag discharge temperature is ≤100℃ and the slag drop temperature is ≤50℃.

[0003] The wet slag discharge system of the hazardous waste incineration line has excellent cooling performance for the incineration slag. At the same time, it has a water seal system to effectively prevent smoke from overflowing. However, there are also some disadvantages. First, the wet slag discharge system uses cooling water for sealing. After the cooling water absorbs the heat of the incineration residue, it produces water vapor that enters the secondary combustion chamber flue gas, increasing the energy consumption of the hazardous waste incineration system and failing to recover the waste heat of the incineration residue. Secondly, the weight of the incineration slag increases after absorbing moisture, and the cost of disposing of the incineration slag increases. Utility Model Content

[0004] In order to solve the above problems, the utility model provides a dry slag discharging system for a hazardous waste incineration line.

[0005] The utility model discloses a dry slag discharge system for a hazardous waste incineration line, comprising a rotary kiln and a secondary combustion chamber 1, a water-cooled dry slag discharger 2, a slag bin 3, a waste heat boiler 4, a flue gas treatment system 5, a chimney 6, a deaerator 7, a water feed pump 8, a steam header 9, a user heat exchanger 10, a condensate tank 11, a delivery pump 12, a negative pressure exhaust 13, a desalted water replenishment 14, and an air lock 15.

[0006] Furthermore, the high-temperature flue gas generated by the rotary kiln and the secondary combustion chamber 1 is cooled by the waste heat boiler 4 and enters the flue gas purification system 5. The treated flue gas is discharged through the chimney 6 in compliance with the standards.

[0007] Furthermore, the saturated steam generated by the waste heat boiler 4 enters the deaerator 7 through the steam header 9 and enters the user heat exchanger 10 through the other path. The saturated steam is converted into condensed water through the user heat exchanger and enters the condensed water tank 11. The demineralized water makeup water 14 enters the condensed water tank 11.

[0008] Furthermore, the condensed water in the condensed water tank 11 enters the water-cooled dry slag discharger 2 through the delivery pump 12, the incineration slag is cooled to about 100°C by the condensed water, the heated condensed water enters the deaerator 7, and is pumped to the waste heat boiler 4 through the feed water pump 8.

[0009] Furthermore, the water-cooled dry slag discharger 2 is provided with a negative pressure exhaust 13 , and the negative pressure exhaust 13 is connected to the flue gas treatment system 5 .

[0010] Furthermore, the cooled incineration slag enters the slag bin 3 through the air lock 15 .

[0011] Compared with the wet slag discharge system commonly used in the field of hazardous waste incineration, in the dry slag discharge system of the utility model, the incineration slag does not directly contact with water during the cooling process. By setting up a water-exchange water cooling wall, the waste heat of the incineration slag is utilized, avoiding the generation of water vapor during the cooling process of the incineration slag in the wet slag discharge system, thereby improving the overall thermal efficiency of the hazardous waste incineration system. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a dry slag discharge system for hazardous waste incineration line;

[0013] Figure numerals: rotary kiln and secondary combustion chamber 1, water-cooled dry slag discharger 2, slag bin 3, waste heat boiler 4, flue gas treatment system 5, chimney 6, deaerator 7, water feed pump 8, steam manifold 9, user heat exchanger 10, condensate tank 11, delivery pump 12, negative pressure exhaust 13, desalted water replenishment 14, air lock 15. DETAILED DESCRIPTION

[0014] The present invention is further explained below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. For those skilled in the art, they can still modify the recorded technical solutions with reference to the following embodiments, or make equivalent replacements for some of the technical features therein. Any modifications, equivalent replacements, improvements, system deletions, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention. It should be noted that the words "front", "back", "left", "right", "up" and "down" used in the following description refer to the directions in the accompanying drawings, and the words "inside" and "outside" refer to the directions toward or away from the geometric center of a specific component, respectively.

[0015] like Figure 1As shown, a dry slag discharge system for a hazardous waste incineration line includes a rotary kiln and a secondary combustion chamber 1, a water-cooled dry slag discharger 2, a slag bin 3, a waste heat boiler 4, a flue gas treatment system 5, a chimney 6, a deaerator 7, a feed water pump 8, a steam header 9, a user heat exchanger 10, a condensate tank 11, a delivery pump 12, a negative pressure exhaust 13, a desalted water replenishment 14, and an air lock 15. The high-temperature steam generated by the waste heat boiler 4 enters the steam header 9, and the steam in the steam header 9 is divided into two paths, one path of steam enters the deaerator 7, and the other path of steam enters the user heat exchanger 10. After the steam is heat-exchanged in the user heat exchanger 10, the condensed water enters the condensate tank 11, and the desalted water replenishment 14 is replenished into the condensate tank 11. The condensed water in the condensate tank 11 enters the water-cooled dry slag discharger 2 through the delivery pump 12, and is used to cool the incineration slag. The condensed water that absorbs the heat of the slag enters the deaerator 7 for heating and deoxygenation, and is transported to the waste heat boiler 4 through the feed water pump 8. The water-cooled dry slag discharger 2 is provided with a negative pressure exhaust 13, which exhausts air to the flue gas treatment system 5 to maintain a negative pressure environment of the water-cooled dry slag discharger 2. The incineration slag cooled by the water-cooled dry slag discharger 2 enters the slag bin 3 through the air lock 15.

[0016] 1) When the hazardous waste incineration line operates normally, the dry slag discharger operates continuously, the temperature of the incineration residue is about 800-900℃, and the incineration slag from the rotary kiln and the secondary combustion chamber 1 enters the water-cooled dry slag discharger 2.

[0017] 2) The condensed water in the condensed water tank 11 enters the water-cooled dry slag discharger 2 through the delivery pump 12 to cool the incineration residue. After the condensed water absorbs the heat of the incineration residue, it enters the deaerator 7.

[0018] 3) The high-temperature flue gas generated by the rotary kiln and the secondary combustion chamber 1 enters the flue gas treatment system 5 through the waste heat boiler 4. After being treated, the high-temperature flue gas is discharged through the chimney 6 to meet the standards.

[0019] 4) The saturated steam generated by the waste heat boiler 4, one path of steam enters the deaerator 7 to heat the deaerator and deoxidize it, and the other path of steam enters the user heat exchanger 10, and the steam enters the condensation water tank 11 after being condensed by the user heat exchanger.

[0020] 5) The water-cooled dry slag discharger 2 is provided with a negative pressure exhaust 13, which is connected to the flue gas treatment system 5 to maintain the negative pressure of the water-cooled dry slag discharger 2 and prevent the flue gas in the water-cooled dry slag discharger 2 from overflowing.

[0021] 6) The cooled incineration slag enters the slag bin 3 through the air lock 15.

[0022] Example

[0023] The utility model provides a dry slag discharger. During the cooling process, the incineration slag does not come into direct contact with water. By setting a water-exchange water cooling wall, the sensible heat of the high-temperature slag is collected and utilized. The generation of water vapor and energy consumption during the cooling process of the incineration slag are reduced. At the same time, the incineration slag and water absorb the sensible heat of the slag through indirect heat exchange, avoiding the generation of water vapor and improving the overall thermal efficiency of the hazardous waste incineration system.

[0024] The following analysis is based on a 100t / d hazardous waste incineration system:

[0025] Hazardous waste incineration line output: 100t / d;

[0026] Design flow rate of rotary kiln bottom slag: 2t / h;

[0027] Rotary kiln outlet bottom ash temperature: 850℃;

[0028] Dry slag discharge system slag discharge temperature: 80℃;

[0029] Specific heat capacity of dry slag: 0.96kj / kg;

[0030] Dry slag heat dissipation: 1478400kj / kg;

[0031] Cooling water volume of dry slag discharger: 6t / h;

[0032] Cooling water inlet temperature: 20℃;

[0033] Cooling water outlet temperature: 71.1℃;

[0034] Deaerator gas consumption reduction: 0.53t / h;

[0035] The technical means disclosed in the solution of the present utility model are not limited to the technical means disclosed in the above-mentioned implementation mode, but also include technical solutions composed of any combination of the above technical features.

Claims

1. A dry slag discharge system for a hazardous waste incineration line, characterized by: It comprises a rotary kiln and a secondary combustion chamber (1), a water-cooled dry slag discharger (2), a slag bin (3), a waste heat boiler (4), a flue gas treatment system (5), a chimney (6), a deaerator (7), a water feed pump (8), a steam header (9), a user heat exchanger (10), a condensate tank (11), a delivery pump (12), a negative pressure exhaust (13), a desalted water replenishment (14), and an air lock (15).

2. The dry slag discharge system according to claim 1, characterized in that: The high-temperature steam generated by the waste heat boiler (4) enters the steam header (9). The steam in the steam header (9) is divided into two paths, one path of steam enters the deaerator (7), and the other path of steam enters the user heat exchanger (10).

3. The dry slag discharge system according to claim 1, characterized in that: After the steam exchanges heat in the user heat exchanger (10), condensed water enters the condensed water tank (11), and desalted water replenishing water (14) is replenished into the condensed water tank (11).

4. The dry slag discharge system according to claim 1, characterized in that: Condensed water in the condensed water tank (11) enters the water-cooled dry slag discharger (2) via a delivery pump (12) and is used to cool the incineration slag.

5. The dry slag discharge system according to claim 1, characterized in that: The condensed water enters the deaerator (7) to be heated and deoxygenated, and is then transported to the waste heat boiler (4) via the feed water pump (8).

6. The dry slag discharge system according to claim 1, characterized in that: The water-cooled dry slag discharger (2) is provided with a negative pressure exhaust (13) to exhaust air to the flue gas treatment system (5) to maintain a negative pressure environment of the water-cooled dry slag discharger (2).

7. The dry slag discharge system according to claim 1, characterized in that: The incineration slag cooled by the water-cooled dry slag discharger (2) enters the slag bin (3) through the air lock (15).

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