CN201531900U

CN201531900U - Industrial furnace low oxygen combustion control device

Info

Publication number: CN201531900U
Application number: CN2009200662675U
Authority: CN
Inventors: 夏学苏
Original assignee: Individual
Current assignee: Individual
Priority date: 2009-10-13
Filing date: 2009-10-13
Publication date: 2010-07-21
Anticipated expiration: 2019-10-13

Abstract

The utility model discloses an industrial furnace low oxygen combustion control device. Two ends of combustor installed on a furnace are respectively communicated with a furnace body cavity and a fuel valve; an air inlet end of the combustor is connected with a hot air pipe through an air valve; a gas duct outlet end at the tail end of the furnace body is connected with an inlet end of a heat exchanger; the gas duct at an outlet end of the heat exchanger leads to a chimney; a cold air pipe and the hot air pipe extend into the heat exchanger from lateral sides and communicated with each other inside the heat exchanger to form a cold air heating pipe; a bypass valve is mounted between the cold air pipe and the hot air pipe; the tail end of the cold air pipe is connected with an air blower unit which is driven by a speed controller; a detection pipe installed on the lateral wall of the gas duct is connected with a flue oxygen concentration analyzing instrument which is connected with a controller; and the controller is respectively connected with a human-computer interface and the speed controller. By means of utilizing the flue oxygen concentration analyzing instrument and using the speed controller to regulate speed, the industrial furnace low oxygen combustion control device keeps low oxygen combustion state inside the furnace all the time, not only saves electricity and fuel, but also is favorable for environment protection, and has high popularization value.

Description

Industrial furnace low oxygen combustion control device

Technical field

The utility model relates to a kind of control device, relates in particular to a kind of low oxygen combustion control device that heater for rolling steel, blast funnace hot blast stove, chemical industry tube furnace, Industrial Boiler, electricity generation boiler, glass kiln, cement kiln, limekiln, furnace and other industrial furnace use solid, liquid or gaseous fuel that is used for.

Background technology

Because burning quality difference contaminated environment and wasting energy seriously, one of its reason is that air distribution is unreasonable to solid fuel, liquid fuel or the gaseous fuel that is used for industrial furnace in combustion process, makes oxygen content in the industrial furnace or too high or too low.It is that the patent of invention of CN101055090A was done to inquire into regard to this problem that publication number was arranged before the utility model, obtains certain effect.

Summary of the invention

Task to be solved in the utility model provides a kind of industrial furnace low oxygen combustion control device, this control device can all can be guaranteed the burning quality of various fuel in the industrial furnace under the very low situation of oxygen content, neither cause the waste of fuel, free from environmental pollution again.

For finishing above-mentioned task, the technical solution adopted in the utility model is: on the body of heater of making of metal material and refractory material the individual burner of N (integer of N 〉=1) is installed, to make the inner chamber of the end connection body of heater of burner during installation, the other end of burner connects fuel valve, the described fuel that comes from fuel valve can be selected from powder solid fuel (as coal dust etc.), liquid fuel (as flow-like heavy oil diesel oil etc.) or gaseous fuel are (as natural gas, liquefied gas, industrial gas, other fuel gas etc.), the air intake end of burner links to each other with one of air valve, and the other end of air valve is communicated with warm-air pipe.Afterbody at body of heater has flue, and the port of export of flue links to each other with the smoke inlet end of heat exchanger, and the smoke outlet of heat exchanger has a smoke outlet flue to lead to chimney.Cool air hose and warm-air pipe feed heat exchanger and the formation cold wind heating tube that links to each other from the side of heat exchanger in heat exchanger, by-passing valve is installed between cool air hose and the warm-air pipe.The end of cool air hose links to each other with the air opening end of blower unit, and blower unit is driven by speed regulator, and speed regulator is powered by three-phase alternating-current supply.The inner chamber of a feeding flue of the detector tube that is equipped with at flue sidewall, the electrical signal of detector tube links to each other with the electric signal input end of flue gas oxygen concentration analyzer, the electrical signal of flue gas oxygen concentration analyzer is communicated with the signal input part of controller through communication cable, the PORT COM of controller joins through connection and man-machine interface, and the signal output part of controller is connected with the control signal input of speed regulator through communication cable.

Adopt a kind of industrial furnace low oxygen combustion control device that as above technical scheme provides compared with prior art, technique effect is:

1. simple in structure, practical;

2. described industrial furnace low oxygen combustion control device can on-line continuous detect the oxygen concentration in the combustion product in the industrial furnace body of heater, the flue gas oxygen concentration signal of telecommunication that collects according to detector tube in flue rotating speed of via controller and speed regulator and then control blower unit behind flue gas oxygen concentration analyzer is an air quantity, make the air capacity (being oxygen content) in the body of heater be in required scope, guarantee low oxygen combustion in the body of heater, reach fuel-saving purpose.

3. can reduce power consumption 15-20%.

4. free from environmental pollution, social benefit is obvious.

Description of drawings

Accompanying drawing is the schematic layout pattern of a kind of industrial furnace low oxygen combustion control device described in the utility model, also is Figure of abstract of the present utility model.

The specific embodiment

Below in conjunction with accompanying drawing the specific embodiment of the present utility model is described in further detail.

The individual burner 10 of N (integer of N 〉=1) is installed on body of heater 1, and described body of heater 1 can be arbitrary shape, and an end of burner 10 is communicated with the inner chamber of body of heater 1, and the other end of burner 10 connects fuel valve 9.Open fuel valve 9, fuel (as powder solid fuel, liquid fuel or gaseous fuel) is gone in the body of heater 1 with air mixed injecting after fuel valve 9 is gone into burner 10.The air intake end of burner 10 is connected with of air valve 8, and the other end of air valve 8 is communicated with warm-air pipe 6, enters burner 10 and fuel mix burning by fuel valve 9 from the hot-air that adds of warm-air pipe 6 through air valve 8.Afterbody at body of heater 1 has flue 2, and the port of export of flue 2 links to each other with the smoke inlet end of heat exchanger 3, and the smoke outlet of heat exchanger 3 has a smoke outlet flue 2A to lead to chimney, and the flue gas that produces after fuel burns in body of heater 1 is discharged through flue 2 and pipe 2A.Cool air hose 5 and warm-air pipe 6 feed in the heat exchanger 3 from the side of heat exchanger 3, and linking to each other in heat exchanger 3 forms the cold wind heating tube, and by-passing valve 7 is installed between cool air hose 5 and the warm-air pipe 6.The end of cool air hose 5 links to each other with the air opening end of blower unit 4, and blower unit 4 is driven by speed regulator 14 and makes blower unit 4 have the function of transferring air quantity, and speed regulator 14 is by three-phase alternating-current supply 16 power supplies.Close by-passing valve 7, start blower unit 4, blower unit 4 is with the cold wind heating pipeline section of outside air in cool air hose 5 enters heat exchanger 3, and the air after heating is gone in the burner 10 through warm-air pipe 6 and air valve 8.If the air themperature in the reduction warm-air pipe 6 can be opened by-passing valve 7 and be made the cold wind of partly going in the burner 3 from the outside air of cool air hose 5 heat pipeline section, other parts are directly gone into warm-air pipe 6 through by-passing valve 7.The inner chamber of a feeding flue 2 of the detector tube 11 that on flue 2 sidewalls, is equipped with, the electrical signal of detector tube 11 links to each other with the electric signal input end of flue gas oxygen concentration analyzer 12, and the electrical signal of flue gas oxygen concentration analyzer 12 is communicated with the signal input part of controller 13 through communication cable.Described detector tube 11 is a prior art, product can be bought in market, with the supporting use of flue gas oxygen concentration analyzer, detector tube 11 is transformed into the signal of telecommunication with the flue gas oxygen concentration value in the flue 2 and sends into flue gas oxygen concentration analyzer 12 and handle, it is prior art that described flue gas oxygen concentration analyzer 12 belongs to complete set of equipments with detector tube 11, product can be bought in market, as specifications and models is the ZO-4III type zirconia oxygen measuring apparatus that Shanghai Inst. of Silicate, Chinese Academy of Sciences produces, and controller 13 can be selected programmable controller PLC etc. for use, be prior art, product can be bought in market.The PORT COM of controller 13 joins through connection and man-machine interface 15, and the signal output part of controller 13 links to each other with speed regulator 14 control signal inputs through communication cable.Can form by the industrial computer system of programmable controller PLC, Distributed Control System DCS, SCM system, intelligent instrument system or band I/O integrated circuit board by the control section that controller 13, man-machine interface 15 are formed, and man-machine interface 15 can be made up of text display, touch-screen, touch panel computer or industry control host computer, the frequency converter that speed regulator 14 can select for use Siemens to provide, the inner feedback speed-regulating device that also can adopt the large people's science and technology in Beijing to provide.Managing 11 after testing by the oxygen content value in the flue 2 becomes the signal of telecommunication and sends into controller 13 again after flue gas oxygen concentration analyzer 12 is handled, if the oxygen concentration value that flue gas oxygen concentration analyzer 12 records is higher than the setting value of controller 13, illustrate that the oxygen content in the body of heater 1 is too high, air quantity is too much, this moment, controller 13 was passed to speed regulator 14 with control signal, and the rotating speed of speed regulator 14 control blower unit 4 makes to change among a small circle (reduction rotating speed); Otherwise, if the oxygen concentration value that flue gas oxygen concentration analyzer 12 records is lower than controller 13 setting values, illustrate that the oxygen content in the body of heater 1 is too low, deficiency in draught, this moment, controller 13 was passed to speed regulator 14 with control signal, the rotating speed of speed regulator 14 control blower unit 4 makes to change among a small circle (raising rotating speed), change back and forth and so forth and adjust, make blower unit 4 keep a suitable wind supply quantity, make the oxygen content in the flue gas that body of heater 1 discharges be in a lower stable state all the time, both be in the low oxygen combustion state in the body of heater 1, so both fuel saving was free from environmental pollution again.

Claims

1. industrial furnace low oxygen combustion control device, it is characterized in that: quantity is installed on body of heater (1) more than or equal to 1 burner (10), one end of burner (10) is communicated with the inner chamber of body of heater (1), the other end of burner (10) connects fuel valve (9), one of the same air valve of air intake end (8) of burner (10) is connected, and the other end of air valve (8) is communicated with warm-air pipe (6); Afterbody at body of heater (1) has flue (2), and the smoke inlet end of the same heat exchanger of the port of export (3) of flue (2) links to each other, and the smoke outlet of heat exchanger (3) has a smoke outlet flue (2A) to lead to chimney; Cool air hose (5) and warm-air pipe (6) feed heat exchanger (3) from the side of heat exchanger (3), in heat exchanger (3), be connected and form the cold wind heating tube, by-passing valve (7) is installed between cool air hose (5) and the warm-air pipe (6), the air opening end of the terminal same blower unit (4) of cool air hose (5) links to each other, blower unit (4) is driven by speed regulator (14), and speed regulator (14) is powered by three-phase alternating-current supply (16); The inner chamber of a feeding flue (2) of the detector tube (11) that is equipped with at flue (2) sidewall, the electrical signal of detector tube (11) links to each other with the electric signal input end of flue gas oxygen concentration analyzer (12), the electrical signal of flue gas oxygen concentration analyzer (12) is communicated with the signal input part of controller (13) through communication cable, the PORT COM of controller (13) joins through connection and man-machine interface (15), and the signal output part of controller (13) links to each other through the control signal input of communication cable with speed regulator (14).