CN115371078A - Automatic adjusting method and system for temperature deviation of flue gas at outlet of boiler hearth - Google Patents
Automatic adjusting method and system for temperature deviation of flue gas at outlet of boiler hearth Download PDFInfo
- Publication number
- CN115371078A CN115371078A CN202210994164.5A CN202210994164A CN115371078A CN 115371078 A CN115371078 A CN 115371078A CN 202210994164 A CN202210994164 A CN 202210994164A CN 115371078 A CN115371078 A CN 115371078A
- Authority
- CN
- China
- Prior art keywords
- flue gas
- preset
- temperature deviation
- adjusting
- deviation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N3/00—Regulating air supply or draught
- F23N3/005—Regulating air supply or draught using electrical or electromechanical means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23M—CASINGS, LININGS, WALLS OR DOORS SPECIALLY ADAPTED FOR COMBUSTION CHAMBERS, e.g. FIREBRIDGES; DEVICES FOR DEFLECTING AIR, FLAMES OR COMBUSTION PRODUCTS IN COMBUSTION CHAMBERS; SAFETY ARRANGEMENTS SPECIALLY ADAPTED FOR COMBUSTION APPARATUS; DETAILS OF COMBUSTION CHAMBERS, NOT OTHERWISE PROVIDED FOR
- F23M9/00—Baffles or deflectors for air or combustion products; Flame shields
- F23M9/02—Baffles or deflectors for air or combustion products; Flame shields in air inlets
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Incineration Of Waste (AREA)
Abstract
The invention belongs to the technical field of temperature control, and provides a method and a system for automatically adjusting the temperature deviation of flue gas at the outlet of a boiler hearth, wherein during adjustment, the opening of a burn-out air baffle and the offset angle of the burn-out air are adjusted according to a preset sequence and amplitude according to the temperature deviation condition of the flue gas; obtaining the adjusted temperature deviation of the flue gas; continuously comparing the oxygen content deviation in the flue gas before and after adjustment, if the oxygen content deviation exceeds the preset oxygen content limit value, adjusting a secondary air baffle according to a preset proportion and amplitude until the oxygen content deviation is within the preset oxygen content limit value; whether the temperature deviation of the adjusted flue gas is reduced to the temperature deviation preset limit value or not is continuously judged, whether the temperature deviation is reduced to the temperature deviation preset limit value or not is determined, whether the temperature deviation is continuously judged and adjusted is judged and adjusted through the adjusting process, automatic adjustment of the burnout air baffle and the secondary air baffle according to the temperature deviation condition of the flue gas is achieved, the problems that manual adjustment is long in time consumption and poor in adjusting effect are solved, and the phenomenon that the temperature deviation of the flue gas at the outlet of the hearth is large is eliminated.
Description
Technical Field
The invention belongs to the technical field of temperature control, and particularly relates to a method and a system for automatically adjusting temperature deviation of flue gas at an outlet of a boiler hearth.
Background
In a thermal power plant, the condition that the temperature deviation of the smoke at the outlet of a hearth is large often occurs in the operation process of a boiler, and the difference of the temperatures of main steam at two sides is large and exceeds the allowable range in serious conditions, so that the operation safety and the economic benefit are directly influenced.
The inventor finds that generally, operators of a power plant can manually adjust air distribution at different levels to try to eliminate the phenomenon of large deviation of the temperature of smoke at the outlet of a hearth, the adjusting process is long in time consumption and poor in adjusting effect, the experience and the specific operation method of each team and each specific operation operator are different, the personal level and the experience of the operators have very important influence on the adjusting process and the result, different operators have different results in adjustment at different occasions, the randomness of the operating process is large, the adjusting effect is unstable, sometimes the deviation can be increased, frequent adjustment can also have serious influence on stable combustion of a boiler, and therefore the economy and the safety of a unit are affected.
Disclosure of Invention
The invention provides a method and a System for automatically adjusting the temperature deviation of flue gas at the outlet of a boiler furnace, which aim to solve the problems and adopt a positive and negative tangential air adjusting method, a temperature adjusting Control logic module is directly added in a Distributed Control System (DCS for short), an automatic or manual mode can be selected according to the temperature deviation condition of the flue gas, the parameters are firstly judged, then the angle and the air quantity of the positive tangential air or the negative tangential air are adjusted, parameters such as oxygen quantity and the like are coupled at the same time, the judgment and the adjustment are carried out continuously in a delayed way, and the temperature deviation of the flue gas is automatically and gradually reduced to an allowable range under the condition that other parameters are not greatly changed, so that the steam temperature deviation is reduced. The automatic adjustment and control of the baffle plate can also have beneficial effects on improving the combustion efficiency of the boiler and reducing the emission of nitrogen oxides (NOx).
In order to achieve the purpose, the invention is realized by the following technical scheme:
in a first aspect, the invention provides a method for automatically adjusting the temperature deviation of flue gas at an outlet of a boiler furnace, which comprises the following steps:
acquiring the temperature of flue gas at two sides of a hearth outlet;
calculating to obtain the temperature deviation of the flue gas on the two sides according to the obtained temperature of the flue gas on the two sides;
judging whether the deviation of the flue gas temperature exceeds a preset limit value, if so, adjusting, otherwise, not adjusting;
if the flue gas temperature deviation exceeds the preset temperature deviation limit value, adjusting the opening of the burn-out air baffle and the offset angle of the burn-out air according to the preset sequence and amplitude according to the flue gas temperature deviation condition to obtain the adjusted flue gas temperature deviation and the adjusted flue gas oxygen content;
continuously comparing the oxygen content deviation in the flue gas before and after adjustment, if the oxygen content deviation exceeds the preset oxygen content limit value, adjusting a secondary air baffle according to a preset proportion and amplitude until the oxygen content deviation is within the preset oxygen content limit value;
and continuously acquiring and comparing whether the temperature deviation of the flue gas on the two sides is reduced to the preset limit value of the temperature deviation, if so, stopping adjustment, otherwise, continuously judging and adjusting until the temperature deviation of the flue gas is reduced to the preset limit value of the temperature deviation.
Furthermore, when the burn-out air baffle is opened to be large, the burn-out air baffle is sequentially opened to be large from the upper layer to the lower layer within a preset opening increment range, when the burn-out air baffle is opened to be large to a limit value, the offset angle of each layer of burn-out air is sequentially adjusted to be large from top to bottom in a preset range each time, and the baffle or the offset angle is calculated and judged once per layer until the adjustment requirement is met;
when the burnout air baffle is adjusted to be turned down, each layer of burnout air baffle is sequentially turned down in the sequence from the upper layer to the lower layer within the preset opening increment range, when the burnout air baffle is turned down to the limit value, the offset angle of each layer of burnout air is sequentially adjusted to be turned down from the top down in each preset range, and the baffle or the offset angle is calculated and judged once every layer of adjustment until the adjustment requirement is met.
Furthermore, when the secondary air baffle is opened, sequentially opening each layer of secondary air baffle from the upper layer to the lower layer within a preset opening increment range;
when the secondary air baffle is adjusted to be closed, each layer of secondary air baffle is closed in sequence from the upper layer to the lower layer within the range of the preset opening increment;
and calculating and judging once every adjusting layer until the adjusting requirement of the oxygen content is met.
Further, the change of the oxygen content of the flue gas during the adjustment is kept within a preset allowable range.
Further, if the temperature of the flue gas at one side of the outlet of the hearth is higher than that of the flue gas at the other side, namely the temperature is distributed clockwise from high to low, whether the opening degree of the burn-out air baffle is larger than a first preset limit value opening degree is judged, if so, the reverse cut burn-out air is shut down according to a preset proportion, and if not, an alarm is given; if the temperature of the flue gas at one side of the hearth outlet is lower than that of the flue gas at the other side, namely the temperature is distributed anticlockwise from high to low, judging whether the opening degree of the burn-out air baffle is larger than a second preset limit value opening degree or not, if so, giving an alarm, and otherwise, opening the large reverse cut burn-out air according to a preset proportion.
And further, judging whether the oxygen content in the smoke before adjustment is larger than that in the smoke after adjustment, if so, opening the large secondary air baffles layer by layer according to a preset proportion and sequence, otherwise, closing the secondary air according to the preset proportion and sequence.
Furthermore, the adjusting sequence, the adjusting range, the adjusting size limit value and the adjusting speed of the burnout air baffle and the secondary air baffle are adjustable.
In a second aspect, the present invention further provides an automatic adjusting system for temperature deviation of flue gas at an outlet of a boiler furnace, comprising:
a data acquisition module configured to: acquiring the temperature of flue gas at two sides of a hearth outlet;
a temperature deviation calculation module configured to: calculating to obtain the temperature deviation of the flue gas on the two sides according to the obtained temperature of the flue gas on the two sides;
a first determination module configured to: judging whether the temperature deviation of the flue gas exceeds a preset limit value, if so, adjusting, otherwise, not adjusting;
a first adjustment module configured to: if the flue gas temperature deviation exceeds a preset temperature deviation limit value, adjusting the opening of the burn-out air baffle and the offset angle of the burn-out air according to a preset sequence and amplitude according to the flue gas temperature deviation condition; obtaining the adjusted temperature deviation and the adjusted oxygen content of the flue gas;
a second determination module configured to: judging whether the oxygen content deviation of the adjusted smoke gas exceeds a preset limit value, if so, continuing to adjust, and otherwise, stopping adjusting;
a second adjustment module configured to: when the oxygen content deviation of the adjusted flue gas exceeds the preset oxygen content limit, adjusting a secondary air baffle according to a preset proportion and amplitude until the oxygen content deviation is within the preset oxygen content limit;
a third determination module configured to: and continuously acquiring and comparing whether the temperature deviation of the flue gas at the two sides is reduced to a preset temperature deviation limit value, if so, stopping adjustment, otherwise, continuously judging and adjusting until the temperature deviation of the flue gas is reduced to the preset temperature deviation limit value.
In a third aspect, the present invention further provides a computer-readable storage medium, on which a computer program is stored, which when executed by a processor, implements the steps of the automatic adjusting method for the temperature deviation of flue gas at the outlet of a boiler furnace according to the first aspect.
In a fourth aspect, the present invention further provides an electronic device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, and when the processor executes the program, the steps of the method for automatically adjusting the temperature deviation of flue gas at the outlet of the boiler furnace according to the first aspect are implemented.
Compared with the prior art, the invention has the beneficial effects that:
1. whether the adjustment is carried out is determined by judging whether the flue gas temperature deviation exceeds a preset limit value, and during adjustment, the opening degree of an ember air baffle and the offset angle of ember air are adjusted according to the flue gas temperature deviation condition and a preset sequence and amplitude; obtaining the adjusted temperature deviation of the flue gas; continuously comparing the oxygen content deviation in the flue gas before and after adjustment, if the oxygen content deviation exceeds the preset oxygen content limit, adjusting the secondary air baffle according to a preset proportion and amplitude until the oxygen content deviation is within the preset oxygen content limit; continuously judging whether the adjusted flue gas temperature deviation is reduced to a preset limit value of the temperature deviation or not to determine whether to continuously judge and adjust; through the adjusting process, the automatic adjustment of the burnout air baffle and the secondary air baffle according to the temperature deviation condition of the flue gas is realized, so that the problems of long time consumption and poor adjusting effect of manual adjustment are solved, and the phenomenon of large temperature deviation of the flue gas at the outlet of the hearth is eliminated;
2. except that a new temperature regulation control logic module is arranged in the DCS, the rest temperature measurement, air regulation baffle plates, actuator equipment and the like are original boiler equipment (generally, a burn-out air baffle plate is arranged at the upper part of a boiler combustion area, and a secondary air baffle plate is arranged in a boiler burner area and is arranged in a staggered manner with primary air of a burner), namely, additional equipment is not needed, the whole system is not influenced, the implementation is simple and reliable, the investment is less, and the effect is quick;
3. after the automatic control system is put into automation, the automatic control system can automatically adjust and control or keep the smoke temperature deviation within an allowable range by means of judgment of the logic module, the dependence of the adjusting and controlling result on the quality and experience of operators is eliminated, manual operation intervention is greatly reduced, the operation and adjustment workload of the operators is greatly reduced, the operators can concentrate on monitoring the changes of other important parameters, and the safe and economic operation of a unit is facilitated;
4. the invention automatically adjusts and coordinates the baffle to realize the purpose of adjusting the temperature difference, reduces the frequent manual operation, reduces the influence of the adjustment operation on the whole system, and also has beneficial effect on the combustion stability of the boiler.
Drawings
The accompanying drawings, which form a part hereof, are included to provide a further understanding of the present embodiments, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the present embodiments and together with the description serve to explain the present embodiments without unduly limiting the present embodiments.
FIG. 1 is a flowchart of the judgment in embodiment 1 of the present invention;
FIG. 2 is a flowchart of example 1 of the present invention.
Detailed Description
The invention is further described with reference to the following figures and examples.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
Description of the invention: the present invention is explained by taking the case of the tangential circle turning of the air flow in the boiler being counterclockwise and the reverse circle turning of the burn-out air as an example.
Example 1:
as shown in fig. 1, the present embodiment provides a method for automatically adjusting a temperature deviation of flue gas at an outlet of a boiler furnace, including:
acquiring the temperature of flue gas at two sides of a hearth outlet;
calculating to obtain the temperature deviation of the flue gas on the two sides according to the obtained temperature of the flue gas on the two sides;
judging whether the temperature deviation of the flue gas exceeds a preset limit value, if so, adjusting, otherwise, not adjusting;
if the flue gas temperature deviation exceeds a preset temperature deviation limit value, adjusting the opening of the burn-out air baffle and the offset angle of the burn-out air according to a preset sequence and amplitude according to the flue gas temperature deviation condition; obtaining the adjusted temperature deviation and the adjusted oxygen content of the flue gas;
continuously comparing the oxygen content deviation in the flue gas before and after adjustment, if the oxygen content deviation exceeds the preset oxygen content limit, adjusting the secondary air baffle according to a preset proportion and amplitude until the oxygen content deviation is within the preset oxygen content limit;
and continuously acquiring and comparing whether the temperature deviation of the flue gas at the two sides is reduced to a preset temperature deviation limit value, if so, stopping adjustment, otherwise, continuously judging and adjusting until the temperature deviation of the flue gas is reduced to the preset temperature deviation limit value.
When the burnout air baffle is opened to be large, sequentially opening the burnout air baffle from the upper layer to the lower layer within a preset opening increment range, when the burnout air baffle is opened to be large to a limit value, sequentially adjusting the offset angle of each layer of the burnout air from top to bottom by a preset amplitude each time, and calculating and judging once each layer of the baffle or the offset angle is adjusted until the adjustment requirement is met;
when the burnout air baffle is adjusted to be turned down, each layer of burnout air baffle is sequentially turned down in the sequence from the upper layer to the lower layer within the preset opening increment range, when the burnout air baffle is turned down to the limit value, the offset angle of each layer of burnout air is sequentially adjusted to be turned down from the top down in each preset range, and the baffle or the offset angle is calculated and judged once every layer of adjustment until the adjustment requirement is met. When the secondary air baffle is opened, sequentially opening each layer of secondary air baffle from the upper layer to the lower layer within a preset opening increment range; and when the secondary air baffle is adjusted to be reduced, sequentially reducing each layer of secondary air baffle from the upper layer to the lower layer within a preset opening increment range, and calculating and judging once every layer of secondary air baffle is adjusted until the adjustment requirement of the oxygen content is met.
If the temperature of the flue gas at one side of the outlet of the hearth is higher than that of the flue gas at the other side, namely the temperature is distributed clockwise from high to low, judging whether the opening of the burn-out air baffle is larger than a first preset limit opening or not, if so, closing the reverse cut burn-out air according to a preset proportion, and otherwise, alarming; if the temperature of the flue gas at one side of the hearth outlet is lower than that of the flue gas at the other side, namely the temperature is distributed anticlockwise from high to low, judging whether the opening degree of the burn-out air baffle is larger than a second preset limit value opening degree or not, if so, giving an alarm, and otherwise, opening the large reverse cut burn-out air according to a preset proportion. Specifically, if the flue gas temperature of the left (or A) side of the hearth outlet is higher than the flue gas temperature of the right (or B) side, namely the temperature is distributed clockwise from high to low, whether the opening of the burn-out air baffle is larger than a first preset limit opening or not is judged, if yes, the reverse cut burn-out air is reduced according to a preset proportion, and if not, an alarm is given; if the flue gas temperature of the left (or A) side of the hearth outlet is lower than the flue gas temperature of the right (or B) side, namely the temperature is distributed anticlockwise from high to low, judging whether the opening degree of the burn-out air baffle is larger than a second preset limit opening degree or not, if so, giving an alarm, and otherwise, opening the large reverse cut burn-out air according to a preset proportion.
And judging whether the oxygen content in the flue gas before adjustment is larger than that in the flue gas after adjustment, if so, opening the large secondary air baffles layer by layer according to a preset proportion and sequence, otherwise, closing the small secondary air baffles according to the preset proportion and sequence.
In other embodiments, corresponding to the automatic regulating method of the temperature deviation of the flue gas at the outlet of the boiler furnace, the automatic regulating system of the temperature deviation of the flue gas at the outlet of the boiler furnace is also provided; the method comprises the following steps: the DCS system is internally provided with a temperature regulation control logic module, a hearth outlet flue temperature measuring device and an automatic air regulation baffle adjusting device, wherein the temperature measuring device is a temperature measuring thermocouple arranged on a flue, the automatic air regulation baffle adjusting device comprises baffles such as burnout air and secondary air and a matched driving mechanism, and the baffles are positioned in the boiler; and the temperature measuring thermocouple and the driving mechanism are connected with the DCS of the unit. The smoke temperature of a flue at the outlet of the hearth is measured through the temperature measuring device, signals are transmitted to the temperature regulation control logic module in the DCS, deviation calculation is carried out through the module, then an action instruction is sent according to a calculation result, the baffle automatic regulating device is controlled to carry out coordinated control regulation on each baffle, the smoke temperature deviation is gradually reduced to an allowable range in a negative feedback mode, and therefore the purpose of automatic temperature regulation is achieved.
In the logic module, the turning selection of the furnace smoke flow tangent circle under normal conditions can be set, the clockwise or counterclockwise direction can be selected, the embodiment is described by taking the counterclockwise direction as an example, the maximum allowable value of the smoke temperature deviation of one side (marked as the left side or the A side) and the other side (marked as the right side or the B side) can be set, and the maximum allowable value is generally set to be 50 ℃.
Function selection is set in the logic module: if automatic/automatic release is adopted, the air adjusting baffle is selected to be in an automatic/manual state, and the like, part of baffles can be randomly selected to participate or quit automatic adjustment, the adjusting sequence, the adjusting amplitude, the size limit value and the adjusting speed of the automatic adjustment of the baffles can be set, the waiting time before the module judges each time, and the like; the air adjusting baffle comprises a secondary air baffle, a peripheral air baffle, an after-combustion air baffle and the like.
And the logic module is internally provided with a control sequence and an adjusting amplitude of an air adjusting baffle switch. The usual settings are: when the large embers are adjusted, sequentially increasing each embers baffle by 2-5% from the upper layer to the lower layer, when the baffles are increased to the limit value, sequentially adjusting the offset angle of each large embers baffle from top to bottom by 5 degrees each time until the offset angle reaches the maximum limit value, and calculating and judging once each baffle or offset angle adjusting module until the adjustment requirement is met; when the baffle plate for closing the burnout air is adjusted, sequentially closing each layer of the burnout air baffle plate by 2-5% from the upper layer to the lower layer, when the baffle plate is closed to the limit value, sequentially adjusting the offset angle of each layer of the burnout air to be closed from top to bottom by the amplitude of 5 degrees each time until the offset angle reaches the minimum limit value, and calculating and judging once each layer of module for adjusting the baffle plate or the offset angle until the adjustment requirement is met; when the large overfire air baffle is adjusted to be opened, 1-2% of the combustion ash air baffles on each layer are sequentially opened from the upper layer to the lower layer, when the small overfire air baffle is adjusted to be closed, 1-2% of the combustion ash air baffles on each layer are sequentially closed from the upper layer to the lower layer, and the calculation and judgment are carried out once when each layer of modules is adjusted until the adjustment requirement of oxygen content is met. Because the operation and adjustment characteristics of each boiler are possibly very different, the optimal baffle switch combination sequence, the adjustment amplitude, the size limit value of automatic adjustment and the adjustment speed of a certain unit can be further determined through field tests, and are specifically set in the module, so that the adjustment can be more effectively and specifically performed, the specific characteristics of each unit are better met, and the individuation is better realized.
In some embodiments, the control sequence, the adjustment range, the size limit value of automatic adjustment and the adjustment speed of the air adjusting baffle switch are set, the optimal scheme of a certain unit can be further determined through field tests, and the optimal scheme is specifically set in the module, so that the adjustment can be effectively and specifically carried out, the specific characteristics of each unit are better met, and the individual requirements are met.
The logic module is also coupled with the change adjustment of parameters such as oxygen quantity, the change of the oxygen quantity during the adjustment is kept within a certain allowable range, the general change range can be set to be 0.5-1%, the change is different according to different characteristics of each boiler, the optimal value can be specifically determined through field tests, and other influences on combustion caused by the adjustment process are avoided, so that the operation stability of the unit is influenced.
The temperature measuring device measures the temperature of the smoke in the flue, transmits signals to a temperature regulation control logic module in the DCS, performs deviation calculation and correction, sends out corresponding action instructions according to the calculation result, controls the action of a driving mechanism of the baffle plate to perform coordinated control and regulation on each baffle plate, performs measurement and calculation again after a certain time, performs regulation, measurement and calculation again according to the latest result, and performs further regulation and control, so that the deviation of the smoke temperature is gradually reduced to an allowable range in a negative feedback mode, and the purpose of automatic temperature regulation is achieved.
The flue gas baffle realizes the regulation of its aperture through actuating mechanism, and actuating mechanism can adopt driving motor, compressed air or other current drive modes to realize.
The baffle and the matched driving mechanism are all original structures of the boiler.
The thermocouple or the temperature sensor for measuring the temperature of the flue gas at the outlet of the hearth is an existing boiler facility, and the model can be specifically selected according to the actual situation, so that detailed description is omitted.
Example 2:
the embodiment provides a boiler furnace export flue gas temperature deviation automatic regulating system, includes:
a data acquisition module configured to: acquiring the temperature of flue gas on two sides of a hearth outlet;
a temperature deviation calculation module configured to: calculating to obtain the temperature deviation of the flue gas on the two sides according to the obtained temperature of the flue gas on the two sides;
a first determination module configured to: judging whether the deviation of the flue gas temperature exceeds a preset limit value, if so, adjusting, otherwise, not adjusting;
a first adjustment module configured to: if the flue gas temperature deviation exceeds a preset temperature deviation limit value, adjusting the opening of the burn-out air baffle and the offset angle of the burn-out air according to a preset sequence and amplitude according to the flue gas temperature deviation condition; obtaining the adjusted temperature deviation and oxygen content of the flue gas;
a second determination module configured to: judging whether the deviation of the oxygen content of the adjusted smoke gas exceeds a preset limit value, if so, continuing to adjust, otherwise, stopping adjusting;
a second adjustment module configured to: when the oxygen content deviation of the adjusted flue gas exceeds the preset oxygen content limit, adjusting a secondary air baffle according to a preset proportion and amplitude until the oxygen content deviation is within the preset oxygen content limit;
a third determination module configured to: and continuously acquiring and comparing whether the temperature deviation of the flue gas at the two sides is reduced to a preset temperature deviation limit value, if so, stopping adjustment, otherwise, continuously judging and adjusting until the temperature deviation of the flue gas is reduced to the preset temperature deviation limit value.
The working method of the system is the same as the automatic regulating method of the temperature deviation of the flue gas at the outlet of the boiler furnace in the embodiment 1, and the detailed description is omitted here.
Example 3:
the present embodiment provides a computer-readable storage medium, on which a computer program is stored, which when being executed by a processor, realizes the steps of the automatic adjustment method for the temperature deviation of the flue gas at the outlet of the boiler furnace according to embodiment 1.
Example 4:
the embodiment provides an electronic device, which comprises a memory, a processor and a computer program stored in the memory and capable of running on the processor, wherein the processor executes the program to realize the steps of the automatic adjustment method for the temperature deviation of the flue gas at the outlet of the boiler furnace in the embodiment 1.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes may be made to the present invention by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present embodiment should be included in the protection scope of the present embodiment.
Claims (10)
1. A boiler furnace outlet flue gas temperature deviation automatic regulating method is characterized by comprising the following steps:
acquiring the temperature of flue gas at two sides of a hearth outlet;
calculating to obtain the temperature deviation of the flue gas on the two sides according to the obtained temperature of the flue gas on the two sides;
judging whether the deviation of the flue gas temperature exceeds a preset limit value, if so, adjusting, otherwise, not adjusting;
if the flue gas temperature deviation exceeds the preset temperature deviation limit value, adjusting the opening of the burn-out air baffle and the offset angle of the burn-out air according to the preset sequence and amplitude according to the flue gas temperature deviation condition to obtain the adjusted flue gas temperature deviation and the adjusted flue gas oxygen content;
continuously comparing the oxygen content deviation in the flue gas before and after adjustment, if the oxygen content deviation exceeds the preset oxygen content limit value, adjusting a secondary air baffle according to a preset proportion and amplitude until the oxygen content deviation is within the preset oxygen content limit value;
and continuously acquiring and comparing whether the temperature deviation of the flue gas at the two sides is reduced to a preset temperature deviation limit value, if so, stopping adjustment, otherwise, continuously judging and adjusting until the temperature deviation of the flue gas is reduced to the preset temperature deviation limit value.
2. The method for automatically adjusting the temperature deviation of flue gas at the outlet of the boiler furnace according to claim 1, wherein when the ember wind baffle is opened, the ember wind baffle is opened sequentially from the upper layer to the lower layer within a preset opening increment range, when the ember wind baffle is opened to a limit value, the offset angle of each layer of ember wind is opened sequentially from the top to the bottom by a preset amplitude each time, and the baffle or the offset angle is calculated and judged once for each layer until the adjustment requirement is met;
when the burnout air baffle is adjusted to be turned down, each layer of burnout air baffle is sequentially turned down in the sequence from the upper layer to the lower layer within the preset opening increment range, when the burnout air baffle is turned down to the limit value, the offset angle of each layer of burnout air is sequentially adjusted to be turned down from the top down in each preset range, and the baffle or the offset angle is calculated and judged once every layer of adjustment until the adjustment requirement is met.
3. The method for automatically adjusting the temperature deviation of the flue gas at the outlet of the boiler furnace according to claim 1, wherein when the secondary air baffle is opened, each layer of the secondary air baffle is opened sequentially from the upper layer to the lower layer within a preset opening increment range;
when the secondary air baffle is adjusted to be closed, each layer of secondary air baffle is closed in sequence from the upper layer to the lower layer within the range of the preset opening increment;
and calculating and judging once every adjusting layer until the adjusting requirement of the oxygen content is met.
4. The method for automatically adjusting the temperature deviation of the flue gas at the outlet of the boiler furnace according to claim 1, wherein the change of the oxygen content of the flue gas during the adjustment is kept within a preset allowable range.
5. The method for automatically adjusting the temperature deviation of the flue gas at the outlet of the boiler furnace according to claim 1, wherein if the temperature of the flue gas at one side of the outlet of the furnace is higher than that of the flue gas at the other side, that is, the temperature distribution from high to low is clockwise, it is determined whether the opening of the ember wind blocking plate is larger than a first preset limit opening, if so, the inverse ember wind is turned off according to a preset proportion, otherwise, an alarm is given; if the temperature of the flue gas at one side of the hearth outlet is lower than that of the flue gas at the other side, namely the temperature is distributed anticlockwise from high to low, judging whether the opening degree of the burn-out air baffle is larger than a second preset limit value opening degree or not, if so, giving an alarm, and otherwise, opening the large reverse cut burn-out air according to a preset proportion.
6. The method according to claim 1, wherein the method comprises determining whether the oxygen content in the flue gas before the adjustment is greater than the oxygen content in the flue gas after the adjustment, and if so, opening the large overfire air damper in layers according to a predetermined ratio and sequence, otherwise, closing the overfire air damper in layers according to a predetermined ratio and sequence.
7. The method for automatically adjusting the temperature deviation of the flue gas at the outlet of the boiler furnace according to claim 1, wherein the adjusting sequence, the adjusting amplitude, the adjusting size limit value and the adjusting speed of the ember air baffle and the secondary air baffle are adjustable.
8. The utility model provides a boiler furnace export flue gas temperature deviation automatic regulating system which characterized in that includes:
a data acquisition module configured to: acquiring the temperature of flue gas at two sides of a hearth outlet;
a temperature deviation calculation module configured to: calculating to obtain the temperature deviation of the flue gas on the two sides according to the obtained temperature of the flue gas on the two sides;
a first determination module configured to: judging whether the temperature deviation of the flue gas exceeds a preset limit value, if so, adjusting, otherwise, not adjusting;
a first adjustment module configured to: if the flue gas temperature deviation exceeds a preset temperature deviation limit value, adjusting the opening of the burn-out air baffle and the offset angle of the burn-out air according to a preset sequence and amplitude according to the flue gas temperature deviation condition; obtaining the adjusted temperature deviation and oxygen content of the flue gas;
a second determination module configured to: judging whether the oxygen content deviation of the adjusted smoke gas exceeds a preset limit value, if so, continuing to adjust, and otherwise, stopping adjusting;
a second adjustment module configured to: when the oxygen content deviation of the adjusted flue gas exceeds the preset oxygen content limit, adjusting a secondary air baffle according to a preset proportion and amplitude until the oxygen content deviation is within the preset oxygen content limit;
a third determination module configured to: and continuously acquiring and comparing whether the temperature deviation of the flue gas at the two sides is reduced to a preset temperature deviation limit value, if so, stopping adjustment, otherwise, continuously judging and adjusting until the temperature deviation of the flue gas is reduced to the preset temperature deviation limit value.
9. A computer-readable storage medium, on which a computer program is stored, characterized in that the program, when being executed by a processor, realizes the steps of the automatic adjustment method of the deviation of the temperature of flue gas from the furnace outlet of a boiler furnace according to any one of claims 1 to 7.
10. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor when executing the program implements the steps of the automatic adjusting method for the temperature deviation of flue gas at the outlet of a boiler furnace according to any one of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210994164.5A CN115371078A (en) | 2022-08-18 | 2022-08-18 | Automatic adjusting method and system for temperature deviation of flue gas at outlet of boiler hearth |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210994164.5A CN115371078A (en) | 2022-08-18 | 2022-08-18 | Automatic adjusting method and system for temperature deviation of flue gas at outlet of boiler hearth |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115371078A true CN115371078A (en) | 2022-11-22 |
Family
ID=84064941
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210994164.5A Pending CN115371078A (en) | 2022-08-18 | 2022-08-18 | Automatic adjusting method and system for temperature deviation of flue gas at outlet of boiler hearth |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115371078A (en) |
-
2022
- 2022-08-18 CN CN202210994164.5A patent/CN115371078A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| DK171860B1 (en) | Method and apparatus for controlling fuel combustion | |
| WO2020015694A1 (en) | Combustion air volume control system and method for biomass boiler | |
| JP3230564U (en) | Coal mill outlet temperature control system based on furnace smoke inactivation | |
| CN110260356B (en) | Energy-saving control method of fluidized bed boiler | |
| CN107084404A (en) | A kind of accurate air distribution method of thermal power plant based on combustion control | |
| CN110343847B (en) | Furnace temperature control method and annealing furnace | |
| CN104676638B (en) | A kind of low nitrogen burning control method for air door during boiler load down | |
| CN202075597U (en) | Intelligent optimization control system used in thermal power station | |
| CN111692611B (en) | Automatic control system and method for boiler air supply of power plant | |
| CN103791482A (en) | Thermal power generating unit hearth pressure segmentation control method | |
| CN109595586B (en) | Combustion optimization method and system for preventing high-temperature corrosion of boiler based on CO online detection | |
| CN115419478A (en) | Optimized control method for steel mill gas power generation | |
| CN111664460B (en) | Automatic control operation control method for sludge incineration | |
| CN112212322B (en) | Intelligent control method for optimizing combustion of thermodynamic circulating fluidized bed boiler | |
| CN115371078A (en) | Automatic adjusting method and system for temperature deviation of flue gas at outlet of boiler hearth | |
| CN112797437B (en) | Intelligent air supply control method, equipment and storage medium | |
| CN112363554B (en) | Thermal power generating unit air volume and air pressure decoupling control method | |
| CN201715548U (en) | Intelligent oxygen content optimizing and regulating device for coal-fired industrial boiler | |
| CN105114960B (en) | A kind of method of garbage incinerator thorax Stress control | |
| CN109579044B (en) | Air-fuel ratio dynamic feedforward combustion control method for walking beam furnace | |
| CN112178684A (en) | System and method for improving air/fuel ratio precision of boiler | |
| JPS6115397Y2 (en) | ||
| CN113932247B (en) | Automatic control method for reasonably reducing CO concentration of tower furnace | |
| RU2416759C1 (en) | Procedure for automatic control of interconnected processes of direct flow boiler loading under conditions of process limits | |
| CN115193570B (en) | Air distribution control method, device, storage medium and equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |