A system and method for increasing the amount of sludge and garbage disposed in a garbage power plant

Abstract

The present invention discloses a system and method for increasing the amount of sludge and garbage disposed in a garbage power plant, wherein the outlet of a high-temperature smoke inlet is connected to the smoke inlet of a heat exchanger, the smoke outlet of the heat exchanger is connected to the inlet of a booster fan, and the outlet of the booster fan is connected to the inlet of a smoke return interface; the outlet of a secondary fan is divided into two paths, one of which is connected to the inlet of a low-temperature heating section of the heat exchanger via a first valve, and the other is connected to the secondary air nozzle via a second valve; the outlet of the low-temperature heating section of the heat exchanger is connected to the inlet of a high-temperature heating section of the heat exchanger, and the outlet of the high-temperature heating section of the heat exchanger is connected to the secondary air nozzle; the outlet of a primary fan is connected to the primary air inlet of a furnace via an original primary air heating system and a newly added primary air heater, and the system and method can increase the amount of sludge or garbage disposed in a garbage power plant.

Description

Technical Field

[0001] The invention belongs to the field of garbage power generation, and relates to a system and method for increasing the amount of sludge and garbage disposal in a garbage power plant. Background Art

[0002] With the acceleration of my country's urbanization process, the production of multi-source waste has increased rapidly. The disposal capacity of existing environmental protection facilities is insufficient, and the environmental awareness of the people is gradually improving. Therefore, realizing the resource utilization and harmless disposal of multi-source waste has become a problem for local governments. Waste-to-energy plants are units that concentrate on incinerating and disposing of garbage. In order to improve their functions, many regions use them to carry out the coordinated disposal of sludge and other wastes. Practice shows that when the sludge blending reaches about 10%, the furnace temperature will reach the lower limit of 850℃, which limits the blending of sludge. How to effectively increase its blending is crucial to improving the waste disposal capacity of large-scale equipment. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide a system and method for increasing the amount of sludge and garbage disposed in a waste-to-energy plant. The system and method can increase the amount of sludge or garbage disposed in a waste-to-energy plant.

[0004] To achieve the above-mentioned purpose, the system for increasing the amount of sludge and garbage disposal in a waste-to-energy plant of the present invention comprises a high-temperature smoke inlet, a heat exchanger, a booster fan, a smoke return interface, a secondary fan, a secondary air nozzle, a primary fan, an original primary air heating system and a newly added primary air heater;

[0005] The outlet of the high-temperature smoke inlet is connected to the smoke inlet of the heat exchanger, the smoke outlet of the heat exchanger is connected to the inlet of the booster fan, and the outlet of the booster fan is connected to the inlet of the smoke return interface; the outlet of the secondary fan is divided into two paths, one of which is connected to the inlet of the low-temperature heating section of the heat exchanger through the first valve, and the other is connected to the secondary air nozzle through the second valve; the outlet of the low-temperature heating section of the heat exchanger is connected to the inlet of the high-temperature heating section of the heat exchanger, and the outlet of the high-temperature heating section of the heat exchanger is connected to the secondary air nozzle; the outlet of the primary fan is connected to the primary air inlet of the furnace through the original primary air heating system and the newly added primary air heater.

[0006] It also includes a heating device; the outlet of the low-temperature heating section of the heat exchanger is connected to the air inlet of the heating device, and the air outlet of the heating device is connected to the inlet of the high-temperature heating section of the heat exchanger.

[0007] The outlet of the secondary fan is connected to the inlet of the low-temperature heating section of the heat exchanger through the first valve.

[0008] The outlet of the secondary air fan is connected to the secondary air nozzle via the second valve.

[0009] The method for increasing the sludge and garbage disposal capacity of a garbage power plant of the present invention comprises a sludge and garbage pre-drying mode, a direct secondary air temperature increase mode and a direct primary air temperature increase mode.

[0010] In the sludge and garbage pre-drying mode, high-temperature flue gas is extracted by the high-temperature smoke inlet and sent to the heat exchanger. The air output by the secondary fan is divided into two paths, one of which enters the low-temperature heating section of the heat exchanger and is heated by the high-temperature flue gas, and then enters the heating device, and the other enters the furnace through the secondary air nozzle, wherein the heated air dries the sludge or garbage in the heating device, and the gaseous product discharged from the heating device enters the high-temperature heating section of the heat exchanger. The dried sludge or garbage is discharged from the solid outlet of the heating device and sent to the primary grate for incineration disposal; the gas output from the high-temperature heating section of the heat exchanger enters the secondary air nozzle to increase the secondary air temperature in the secondary air nozzle, and finally enters the furnace with the secondary air for combustion; the flue gas output from the heat exchanger enters the boiler flue through the booster fan and the return smoke interface.

[0011] In the mode of directly increasing the secondary air temperature, the high-temperature flue gas is extracted by the high-temperature smoke inlet and sent to the heat exchanger. The air output by the secondary fan is divided into two paths, one of which enters the low-temperature heating section of the heat exchanger to be heated by the high-temperature flue gas, and then enters the heating device, and the other enters the furnace through the secondary air nozzle; the hot air output by the low-temperature heating section of the heat exchanger enters the high-temperature heating section of the heat exchanger to increase the temperature, and then enters the secondary air nozzle, and finally enters the furnace through the secondary air nozzle for combustion; the flue gas output by the heat exchanger enters the boiler flue through the booster fan and the smoke return interface.

[0012] In the mode of directly increasing the primary air temperature, the air output by the primary fan enters the original primary air heating system for heating, then enters the newly added primary air heater to further increase the temperature, and finally enters the furnace through the furnace primary air inlet.

[0013] The present invention has the following beneficial effects:

[0014] The system and method for increasing the amount of sludge and garbage disposed in a waste-to-energy plant described in the present invention, during specific operation, extracts high-temperature flue gas from the flue, and uses it to pre-dry the sludge and garbage, directly increase the secondary air temperature, and directly increase the primary air temperature, thereby increasing the amount of sludge and garbage disposed in the waste-to-energy plant, promoting technological progress in waste-to-energy plants, improving the utilization efficiency of national large-scale equipment, and effectively saving social capital and land area. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the present invention.

[0016] Among them, 1 is the high-temperature smoke intake port, 2 is the heat exchanger, 3 is the booster fan, 4 is the smoke return interface, 5 is the secondary fan, 6 is the heating device, 7 is the secondary air nozzle, 8 is the primary fan, 9 is the original primary air heating system, and 10 is the newly added primary air heater. DETAILED DESCRIPTION

[0017] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiment of the present invention. Obviously, the described embodiment is only an embodiment of a part of the present invention, not all embodiments, and is not intended to limit the scope of the present invention. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concepts disclosed in the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work should fall within the scope of protection of the present invention.

[0018] The accompanying drawings show schematic diagrams of structures according to embodiments disclosed in the present invention. These figures are not drawn to scale, and some details are magnified and some details may be omitted for the purpose of clear expression. The shapes of various regions and layers shown in the figures and the relative sizes and positional relationships therebetween are only exemplary, and may deviate in practice due to manufacturing tolerances or technical limitations, and those skilled in the art may additionally design regions / layers with different shapes, sizes, and relative positions according to actual needs.

[0019] refer to Figure 1 The system for increasing the amount of sludge and garbage disposal in a waste-to-energy plant of the present invention comprises a high-temperature smoke inlet 1, a heat exchanger 2, a booster fan 3, a smoke return interface 4, a secondary fan 5, a heating device 6, a secondary air nozzle 7, a primary fan 8, an original primary air heating system 9 and a newly added primary air heater 10;

[0020] The outlet of the high-temperature smoke inlet 1 is connected to the smoke inlet of the heat exchanger 2, the smoke outlet of the heat exchanger 2 is connected to the inlet of the booster fan 3, and the outlet of the booster fan 3 is connected to the inlet of the smoke return interface 4; the outlet of the secondary fan 5 is divided into two paths, one of which is connected to the inlet of the low-temperature heating section of the heat exchanger 2 through the first valve, and the other is connected to the secondary air nozzle 7 through the second valve; the low-temperature heating section outlet of the heat exchanger 2 is connected to the high-temperature heating section inlet of the heat exchanger 2, or the low-temperature heating section outlet of the heat exchanger 2 is connected to the air inlet of the heating device 6, the air outlet of the heating device 6 is connected to the inlet of the high-temperature heating section of the heat exchanger 2, and the high-temperature heating section outlet of the heat exchanger 2 is connected to the secondary air nozzle 7; the outlet of the primary fan 8 is connected to the primary air inlet of the furnace through the original primary air heating system 9 and the newly added primary air heater 10.

[0021] The method for increasing the amount of sludge and garbage disposed in a waste-to-energy plant of the present invention comprises the following steps:

[0022] There are three specific operation modes:

[0023] The first operation mode is used to pre-dry the sludge and garbage and increase the secondary air temperature. The specific working process is: the high-temperature flue gas of about 700°C is extracted by the high-temperature flue gas inlet 1 and sent to the heat exchanger 2. The air of about 20°C output by the secondary fan 5 is divided into two paths. One path enters the low-temperature heating section of the heat exchanger 2 and is heated to about 300°C by the high-temperature flue gas, and then enters the heating device 6. The other path enters the furnace through the secondary air nozzle 7; the hot air of about 300°C is heated to the sludge or garbage in the heating device 6. Drying, the gaseous product at about 100°C after drying is discharged from the gas outlet of the heating device 6 and enters the high-temperature heating section of the heat exchanger 2. The dried sludge or garbage is discharged from the solid outlet of the heating device 6 and sent to the primary grate for incineration. The gaseous product at about 100°C discharged from the gas outlet of the heating device 6 is heated to about 280°C in the high-temperature heating section of the heat exchanger 2, and then enters the secondary air nozzle 7 to increase the secondary air temperature in the secondary air nozzle 7 to above 100°C, and enters the furnace with the secondary air for combustion. The flue gas temperature output by the heat exchanger 2 is about 350°C, and then enters the boiler flue through the booster fan 3 and the return smoke interface 4.

[0024] In the second operation mode, it is used to directly increase the secondary air temperature. The specific process is: high-temperature flue gas of about 700°C is extracted by the high-temperature flue gas inlet 1 and sent to the heat exchanger 2. The air of about 20°C output by the secondary fan 5 is divided into two paths, one of which enters the low-temperature heating section of the heat exchanger 2 and is heated to about 200°C by the high-temperature flue gas, and then enters the heating device 6, and the other enters the furnace through the secondary air nozzle 7; the air of about 200°C output by the low-temperature heating section of the heat exchanger 2 enters the high-temperature heating section of the heat exchanger 2 to increase the air temperature to above 320°C, and then enters the secondary air nozzle 7, so that the secondary air temperature in the secondary air nozzle 7 is increased to above 120°C, and finally enters the furnace through the secondary air nozzle 7 for combustion; the flue gas temperature output by the heat exchanger 2 is about 350°C, and enters the boiler flue through the booster fan 3 and the return smoke interface 4. In addition, an electric heating device can be added to the original secondary air system to directly increase the secondary air temperature to above 100°C. The secondary air temperature is determined based on the amount of sludge blended for combustion or the amount of garbage disposed.

[0025] Under the third operating mode, it is used to directly increase the primary air temperature. The specific process is: the air output by the primary fan 8 enters the original primary air heating system 9 for heating, and then enters the newly added primary air heater 10 to further increase the temperature, and finally enters the furnace through the furnace primary air inlet. The air temperature at the outlet of the newly added primary air heater 10 is determined according to the sludge blending amount or garbage disposal amount.

Claims

1. A system for increasing the amount of sludge and garbage disposed in a waste-to-energy plant, characterized in that: It includes a high-temperature smoke inlet (1), a heat exchanger (2), a booster fan (3), a smoke return interface (4), a secondary fan (5), a secondary air nozzle (7), a primary fan (8), an original primary air heating system (9) and a newly added primary air heater (10); The outlet of the high-temperature smoke inlet (1) is connected to the smoke inlet of the heat exchanger (2), the smoke outlet of the heat exchanger (2) is connected to the inlet of the booster fan (3), and the outlet of the booster fan (3) is connected to the inlet of the smoke return interface (4); the outlet of the secondary fan (5) is divided into two paths, one of which is connected to the inlet of the low-temperature heating section of the heat exchanger (2) through a first valve, and the other is connected to the secondary air nozzle (7) through a second valve; the outlet of the low-temperature heating section of the heat exchanger (2) is connected to the inlet of the high-temperature heating section of the heat exchanger (2), and the outlet of the high-temperature heating section of the heat exchanger (2) is connected to the secondary air nozzle (7); the outlet of the primary fan (8) is connected to the primary air inlet of the furnace through the original primary air heating system (9) and the newly added primary air heater (10); It also includes a heating device (6); the low-temperature heating section outlet of the heat exchanger (2) is connected to the air inlet of the heating device (6), and the air outlet of the heating device (6) is connected to the high-temperature heating section inlet of the heat exchanger (2).

2. The system for increasing the amount of sludge and garbage disposed in a waste-to-energy plant according to claim 1, characterized in that: The outlet of the secondary fan (5) is connected to the inlet of the low-temperature heating section of the heat exchanger (2) via a first valve.

3. The system for increasing the amount of sludge and garbage disposed in a waste-to-energy plant according to claim 2, characterized in that: The outlet of the secondary air fan (5) is connected to the secondary air nozzle (7) via a second valve.

4. A method for increasing the amount of sludge and garbage disposed in a waste-to-energy plant, characterized in that: The system for increasing the amount of sludge and garbage disposed in a waste-to-energy plant according to claim 1 comprises a sludge and garbage pre-drying mode, a mode for directly increasing the secondary air temperature and a mode for directly increasing the primary air temperature.

5. The method for increasing the amount of sludge and garbage disposed in a waste-to-energy plant according to claim 4, characterized in that: In the sludge and garbage pre-drying mode, high-temperature flue gas is extracted by a high-temperature flue gas inlet (1) and sent to a heat exchanger (2). The air output by the secondary fan (5) is divided into two paths, one of which enters the low-temperature heating section of the heat exchanger (2) to be heated by the high-temperature flue gas and then enters the heating device (6). The other path enters the furnace through the secondary air nozzle (7). The heated air dries the sludge or garbage in the heating device (6). The gaseous product discharged from the heating device (6) enters the high-temperature heating section of the heat exchanger (2). The dried sludge or garbage is discharged from the solid outlet of the heating device (6) and sent to the primary grate for incineration. The gas output from the high-temperature heating section of the heat exchanger (2) enters the secondary air nozzle (7) to increase the secondary air temperature in the secondary air nozzle (7), and finally enters the furnace with the secondary air for combustion. The flue gas output from the heat exchanger (2) enters the boiler flue through the booster fan (3) and the smoke return interface (4).

6. The method for increasing the amount of sludge and garbage disposed in a waste-to-energy plant according to claim 4, characterized in that: In the mode of directly increasing the secondary air temperature, high-temperature flue gas is extracted by using a high-temperature flue gas inlet (1) and sent to a heat exchanger (2). The air output by the secondary air fan (5) is divided into two paths, one of which enters the low-temperature heating section of the heat exchanger (2) to be heated by the high-temperature flue gas and then enters the heating device (6), and the other enters the furnace through the secondary air nozzle (7); the hot air output by the low-temperature heating section of the heat exchanger (2) enters the high-temperature heating section of the heat exchanger (2) to be heated, then enters the secondary air nozzle (7), and finally enters the furnace through the secondary air nozzle (7) to be burned; the flue gas output by the heat exchanger (2) enters the boiler flue through the booster fan (3) and the smoke return interface (4).

7. The method for increasing the amount of sludge and garbage disposed in a waste-to-energy plant according to claim 4, characterized in that: In the mode of directly increasing the primary air temperature, the air output by the primary fan (8) enters the original primary air heating system (9) for heating, then enters the newly added primary air heater (10) to further increase the temperature, and finally enters the furnace through the furnace primary air inlet.

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