TWM541896U - Waste gas recirculation de-nitrification system of advanced incinerator with energy saving effect - Google Patents

Description

Advanced incinerator exhaust gas reflux denitration system with energy saving effect

This creation department is about an energy-saving advanced incinerator exhaust gas reflux denitration system, especially by using a normal temperature primary combustion air intake control system to meet the primary combustion air temperature required for different areas of the incinerator boiler hearth, and Reduce the negative impact of the introduction of the exhaust gas recirculation system on the incinerator boiler body and its control.

At present, landfill burial methods are one of the most commonly used methods for dealing with domestic waste and industrial waste formed by industrial manufacturing processes. However, due to land resources, it is difficult to obtain proper land to set up landfills. In particular, there will be doubts about secondary pollution caused by the impact of groundwater sources. Therefore, it is quite understandable that the general public will resist the idea of setting up a landfill nearby.

In order to solve the problem of waste, incinerators are one of the preferred choices in modern society, because the use of land is small and easy to set up, and the amount of final waste can be greatly reduced. In addition, the incinerator can generate additional heat energy that can be heated to produce warm water for use in a heated swimming pool or to warm the room during the winter, or to generate electricity for further generation.

In general, high-efficiency incinerators require a denitration unit to remove nitrogen oxides from the exhaust gas due to the high furnace temperature. Furthermore, the primary combustion air of the exhaust gas recirculation system of the conventional mechanical hearth incinerator is a high temperature air having a uniform temperature.

However, the above-mentioned conventional technology has the disadvantage that the high temperature exhaust gas of the exhaust gas recirculation system increases the furnace temperature of the incinerator, so it is necessary to reduce the temperature of the primary combustion air to cope with it, but as a result, the dryness of the fuel is poor and the bottom slag is burned. The value of the burning loss is high and the position of the burning line is deviated from the normal area, causing unintended damage to the refractory, which greatly affects the operational stability and severely shortens the service life.

Another disadvantage is that if the secondary combustion air is increased to suppress the increase of the furnace temperature, This will greatly increase the oxygen content in the combustion chamber and inhibit the efficiency of introduction into the exhaust gas recirculation system.

Therefore, there is a need for an innovative energy-saving advanced incinerator exhaust gas reflux denitration system that maintains the normal temperature stability of the furnace and maintains the combustion zone in the normal area, reducing the chance of unanticipated damage to the refractory while maintaining The value of the bottom slag burning reduction is normal, and the denitration effect of the exhaust gas recirculation system is improved. In particular, the amount of preheating steam of the primary combustion air can be reduced, thereby solving the problems of the above conventional technology.

The main purpose of this creation is to provide an advanced incinerator exhaust gas reflux denitration system with energy saving effect, mainly including primary combustion air fan, primary combustion air main road, primary combustion air preheater, high temperature primary combustion air pipeline, and normal temperature. Primary combustion air main line, normal temperature primary combustion air branch line, intake control valve, primary combustion air hearth bellows, hearth, incinerator boiler, exhaust gas treatment system, exhaust gas return system, induced fan and chimney, and this creation is It can be used in the exhaust gas recirculation denitration process of mechanical hearth incinerator as a primary combustion air intake control system at normal temperature.

Specifically, the primary combustion air fan is coupled to the primary combustion air preheater through a primary combustion air main line, and the primary combustion air preheater is coupled to the lower portion of the hearth through the high temperature primary combustion air line. One-time combustion air bed bellows. Furthermore, the primary air primary combustion air main line is connected to the primary combustion air main line and the normal temperature primary combustion air branch line, and the normal temperature primary combustion air branch line is connected to the primary combustion air hearth bellows. In addition, the intake control valve is installed on the primary combustion air branch line, and the fuel is burned on the surface of the hearth in the incinerator boiler. In particular, the air here is provided by the primary combustion air hearth bellows. And through the grate structure of the hearth and then reach the fuel layer to help burn.

Further, the incinerator boiler generates steam after recovering the waste heat contained in the exhaust gas generated by the combustion, and the exhaust gas generated by the combustion is discharged from the chimney after being blown through the exhaust gas treatment system and further blown by the induced draft fan. Thus, a portion of the exhaust gas can be returned to the incinerator boiler from the exhaust gas recirculation system, wherein the exhaust gas recirculation system is positioned between the exhaust gas treatment system and the chimney.

More specifically, the primary combustion air required for the incinerator boiler to burn fuel is sent by a primary combustion air fan and then divided into two, one of which is the first combustion air. After burning the air preheater and heating to high temperature, it enters the combustion air bed bellows, while the other combustion air is the unheated normal temperature primary combustion air, and passes through its main line and branch line. After that, the intake control valve is distributed to the primary combustion air bed bellows according to the demand.

In addition, the hearth can be divided into a drying section, a burning section and a burning section according to the state of the fuel on the surface thereof, and the required combustion air temperature and air volume are also different depending on the nature of the fuel feeding. Therefore, through this system, the air volume of the combustion air entering the bellows at different positions at normal temperature is appropriately adjusted, and the temperature distribution in the bellows is generated by the difference in the mixing ratio of the combustion air at a high temperature and a normal temperature, and further Meet the needs of different primary combustion air temperatures in different areas of the incinerator boiler hearth.

C10‧‧‧One-time combustion air blower

20‧‧‧One burning air main road

21‧‧‧High temperature primary combustion air line

H30‧‧‧One-time combustion air preheater

40‧‧‧Normal temperature primary combustion air main road

41‧‧‧Normal temperature primary combustion air branch line

V42‧‧‧Intake control valve

50‧‧‧One-time combustion air hearth bellows

51‧‧‧ hearth

52‧‧‧Incinerator boiler

60‧‧‧Exhaust gas treatment system

61‧‧‧Exhaust gas return system

C62‧‧‧Inducing fan

63‧‧‧ chimney

1 shows a schematic diagram of an advanced incinerator exhaust gas reflux denitration system with energy saving effect according to the present embodiment.

The implementation of the present invention will be described in more detail below with reference to the drawings and component symbols, so that those skilled in the art can implement the present specification after studying the present specification.

Please refer to FIG. 1 , which is a schematic diagram of an advanced incinerator exhaust gas reflux denitration system with energy saving effect in the present embodiment. As shown in Figure 1, the energy-saving advanced incinerator exhaust gas reflux denitration system includes a primary combustion air fan C10, a primary combustion air main line 20, a primary combustion air preheater H30, and a high temperature primary combustion air line. 21. Normal temperature primary combustion air main line 40, normal temperature primary combustion air branch line 41, multiple intake control valve V42, primary combustion air hearth bellows 50, hearth 51, incinerator boiler 52, exhaust gas treatment system 60, exhaust gas The reflux system 61, the induced fan C62 and the chimney 63 can be used in the exhaust gas reflux denitration process of a general mechanical hearth incinerator as a primary combustion air intake control system at normal temperature.

Specifically, the primary combustion air blower C10 is coupled to the primary combustion air preheater H30 through the primary combustion air main conduit 20, and the primary combustion air preheater H30 is coupled to the primary combustion through the high temperature primary combustion air conduit 21. The air hearth bellows 50, wherein the primary combustion air hearth bellows 50 are disposed below the hearth 51, and the hearth 51 is disposed within the incinerator boiler 52.

Furthermore, the normal temperature primary combustion air main pipe 40 is connected to the primary combustion air main pipe 20 and the normal temperature primary combustion air branch pipe 41, wherein the plurality of intake control valves V42 are installed on the primary combustion air branch pipe 41, and It is arranged to be located below the primary combustion air hearth bellows 50. In particular, all of the intake control valves are V42 whose openings are toward the primary combustion air hearth bellows 50.

Further, the exhaust gas treatment system 60 is for receiving exhaust gas from the incinerator boiler 52 and performing exhaust gas treatment, and the exhaust gas treatment system 60 is further connected to the exhaust gas recirculation system 61 and the induced draft fan C62, wherein the exhaust gas recirculation system 61 is used to The partially treated exhaust gas of the exhaust gas treatment system 60 is returned to the incinerator boiler 52, and the induced draft fan C62 is used to blow the remaining treated exhaust gas of the exhaust gas treatment system 60 to the chimney 63 and discharge it.

The specific operation of this creation will be described in detail below.

First, the primary combustion air blower C10 blows fresh primary combustion air to the primary combustion air main pipe 20 as a normal temperature primary combustion air, and part of the primary combustion air enters the primary combustion air preheater H30 for preheating treatment. Increasing the temperature, and then transferring to the primary combustion air bed bellows 50 via the high temperature primary combustion air line 21; in addition, the remaining combustion air from the primary combustion air main line 20 is flowing into the normal temperature primary combustion air main line 40, and The primary combustion air supply line 41 is delivered by a single intake control valve, V42, to the primary combustion air hearth bellows 50. In other words, the primary combustion air from the primary combustion air blower C10 is delivered to the primary combustion air hearth bellows 50 via a different two path, wherein the first path is through the primary combustion air main line 20, the primary combustion air preheater H30, the high temperature primary combustion air line 21, and the second path is a normal temperature primary combustion air main line 40, a normal temperature primary combustion air branch line 41, and the intake control valve V42.

Specifically, the fuel (such as to-be-burned matter, garbage, waste) is placed on the surface of the hearth 51 in the incinerator boiler 52, and the primary combustion air line from the high temperature is used by the primary combustion air bed bellows 50. a preheated high-temperature primary combustion air and a normal-temperature primary combustion air blown from the air-conditioning control valve V42 to the hearth 51 and through the grate structure of the hearth 51, thereby helping the fuel on the gas to be obtained Among them, oxygen is effectively burned and incinerated to achieve the function of helping combustion.

When the fuel is burned in the incinerator boiler 52, high-temperature exhaust gas is generated and is discharged from the exhaust gas. The processing system 60 receives and processes, and introduces a part of the treated exhaust gas into the exhaust gas recirculation system 61 to be returned to the incinerator boiler 52, and the remaining treated exhaust gas is sent to the chimney 63 by the blowing of the attracting fan C62, and is discharged to the outside. The main function of the exhaust gas recirculation system 61 is to use the post-combustion exhaust gas to agitate the flame and the combustible gas in the combustion chamber to help complete combustion thereof, and the reflux gas has a lower oxygen content, thereby reducing the formation of nitrogen oxides in a high temperature region. the amount. Therefore, a portion of the exhaust gas can be returned from the exhaust gas recirculation system 61 to the incinerator boiler 52. In particular, the position at which the exhaust gas recirculation system 61 extracts the exhaust gas is disposed between the exhaust gas treatment system 60 and the chimney 63.

Furthermore, the air intake control valves V42 may be disposed at different portions of the primary combustion air hearth bellows 50 for individually adjusting the primary combustion primary air entering the primary combustion air hearth bellows 50 relative to the primary combustion air from the high temperature. The ratio of the high-temperature primary combustion air of the pipeline 21 after preheating is achieved by the function of including the temperature of the primary combustion air at different temperatures required for different parts of the hearth 51, and maintaining the surface fuel of the hearth 51. The layer fire line is in a normal position, and can reduce the occurrence of abnormal refractory damage inside the incinerator boiler 52, reduce the furnace temperature of the incinerator boiler 52, and avoid increasing the oxygen content of the combustion chamber of the incinerator boiler 52 due to the furnace control demand, and further The efficiency of the exhaust gas recirculation system 61 is increased to reduce any possible negative effects caused by the exhaust gas recirculation system 61 after installation.

Additionally, the exhaust gas recirculation system 61 can include a flow control valve (not shown) for controlling the flow of the return exhaust gas to maintain the furnace temperature of the incinerator boiler 52 within an optimal operating range. The flow control valves of the intake control valve V42 and the exhaust gas recirculation system 61 can be realized by a control unit (not shown), such as a computer or a microcontroller.

In summary, the main features of this creation are to maintain the normal stability of the furnace temperature and the burning of the hot line area in the normal area, and to reduce the unintended damage probability of the refractory, while maintaining the normal value of the bottom slag burning reduction and improve the exhaust gas recirculation. The system denitration effect, in particular, can further reduce the amount of steam required for the preheating of the primary combustion air.

The above description is only for the purpose of explaining the preferred embodiment of the present invention, and is not intended to impose any form of limitation on the creation, so that any modification or alteration of the creation made in the same creative spirit is provided. , should still be included in the scope of protection of this creative intent.

C10‧‧‧One-time combustion air blower

20‧‧‧One burning air main road

21‧‧‧High temperature primary combustion air line

H30‧‧‧One-time combustion air preheater

40‧‧‧Normal temperature primary combustion air main road

41‧‧‧Normal temperature primary combustion air branch line

V42‧‧‧Intake control valve

50‧‧‧One-time combustion air hearth bellows

51‧‧‧ hearth

52‧‧‧Incinerator boiler

60‧‧‧Exhaust gas treatment system

61‧‧‧Exhaust gas return system

C62‧‧‧Inducing fan

63‧‧‧ chimney

Claims (5)

An advanced incinerator exhaust gas reflux denitration system with energy-saving effect includes: one-time combustion air fan, which is used to blow once combustion air, and is used as a primary air to burn air once; once a combustion air main pipe, connected to the once a combustion air fan for receiving the primary combustion air; a primary combustion air preheater coupled to the primary combustion air main line for receiving a portion of the primary combustion air and preheating to produce a preheated a high temperature primary combustion air; a high temperature primary combustion air line connected to the primary combustion air preheater for receiving and transmitting the high temperature primary combustion air; a normal temperature primary combustion air main line connected to the primary combustion air main road Receiving and transmitting the normal temperature primary combustion air; a normal temperature primary combustion air branch pipeline connected to the normal temperature primary combustion air main pipeline, and configured with a plurality of intake air control valves for receiving the remaining portion of the primary combustion air and Transfer to the intake control valves; once in the combustion of the air hearth bellows, receiving the air intake from the The valve corresponds to the normal temperature primary combustion air, and the high temperature primary combustion air from the high temperature primary combustion air pipeline, and is mixed to generate mixed air for transmission; an incinerator boiler is built with a hearth, and a The fuel is placed on the surface of the hearth and is received by the mixed air from the primary combustion air bed bellows to generate exhaust gas; an exhaust gas treatment system receives the exhaust gas from the incinerator boiler and is treated by the exhaust gas. Post-transmission; an exhaust gas recirculation system coupled to the exhaust gas treatment system and the incinerator boiler for directing a portion of the exhaust gas to reflux to the incinerator boiler; An inducer fan is coupled to the exhaust gas treatment system for blowing the remainder of the exhaust gas to a chimney for discharge. An advanced incinerator exhaust gas recirculation denitration system having energy saving effect according to claim 1 of the patent application scope, wherein the intake air control valves individually adjust the corresponding primary combustion air and transmit to the combustion air bed bellows Different parts of the room to adjust the corresponding temperature. An advanced incinerator exhaust gas reflux denitration system according to the first application of the patent scope, wherein the exhaust gas recirculation system includes a flow control valve for controlling the flow rate of the return gas. The advanced incinerator exhaust gas reflux denitration system with energy saving effect according to the third application of the patent scope, wherein the intake control valve and the flow control valve of the exhaust gas recirculation system are achieved by a control unit. An advanced incinerator exhaust gas recirculation denitration system having energy saving effect according to item 4 of the patent application scope, wherein the control unit is a computer or a microcontroller.