A boiler ash control system, method and apparatus

Abstract

The application provides a boiler ash removal control system, method and device, and relates to the technical field of boiler ash removal. The ash removal control system comprises a gas storage tank for storing a gas source, a plurality of boiler bodies, an ash storage tower and a feeding hopper. The gas storage tank is connected with the plurality of boiler bodies through a first pipeline. The feeding hopper is connected with the boiler body. The boiler body is connected with the ash storage tower through a second pipeline. The gas storage tank is connected with the ash storage tower through a third pipeline. The boiler body is connected with the feeding hopper through a fourth pipeline. Control valves for controlling the corresponding pipelines are arranged on the first pipeline, the second pipeline, the third pipeline and the fourth pipeline. The boiler ash removal control system, method and device provided in the application can automatically adjust the pressure of the pressure valve and the operation cycle of the warehouse pump according to the pressure difference between the gas inlet and the ash outlet of the boiler after combustion, thereby improving the ash removal effect.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of boiler technology, in particular to a boiler ash removal control system, method and device. BACKGROUND

[0002] In the operation of the boiler in the traditional thermal power industry, the boiler combustion produces ash deposition, which refers to the deposition of ash particles with a temperature lower than the ash melting point on the heating surface, mainly occurring on the convection heating surface. The ash deposition is divided into cohesive ash deposition and loose ash deposition according to the intensity of the ash deposition. The cohesive ash deposition is mainly due to the condensate of low-melting-point metal elements contained in the high-temperature flue gas when the smoke temperature decreases, forming a closed ash ring. The cohesive ash deposition is generally formed on the windward surface of the tube wall and grows along the airflow. The continuous growth of this kind of ash deposition will cause the rapid increase of the resistance of the tube bundle, and even the blockage of the entire flue. The loose ash deposition is generally formed on the leeward surface of the tube wall, or on the windward surface of the tube wall when the particles are very fine and the flue gas speed is very low. The ash deposition will cause the boiler to need frequent shutdown for maintenance, and a large amount of time is needed to judge the fault point and the fault reason before the maintenance can be organized.

[0003] At present, the ash removal method is to clean up at regular intervals, for example, the patent application number is 2015101158888, and the patent name is "a boiler automatic ash removal complete equipment and use method". After the single combustion of the boiler is completed, cleaning is performed. The operation period of the ash removal in the cleaning process is fixed. However, when the combustion amount increases and the combustion material changes, incomplete ash removal will occur. At this time, the length of time and the time interval of the ash blowing need to be adjusted manually, resulting in the problem of low cleaning efficiency. SUMMARY

[0004] Therefore, the purpose of the present application is to provide a boiler ash removal control system, device and electronic equipment, which solves the following technical problems:

[0005] (1) The problem that the boiler needs frequent shutdown for maintenance due to ash deposition, and a large amount of time is needed to judge the fault point and the fault reason before the maintenance can be organized.

[0006] (2) The problem that the cleaning is performed after the single combustion of the boiler is completed. The operation period of the ash removal in the cleaning process is fixed. However, when the combustion amount increases and the combustion material changes, incomplete ash removal will occur. At this time, the length of time and the time interval of the ash blowing need to be adjusted manually, resulting in the problem of low cleaning efficiency.

[0007] The present application adopts the following technical solutions:

[0008] In a first aspect, the embodiments of the present application provide a boiler ash removal control system, comprising a gas storage tank for storing gas, a plurality of boiler bodies, an ash storage tower, and a feeding hopper, the gas storage tank being connected to the plurality of boiler bodies through a first pipeline, the feeding hopper being connected to the boiler bodies, the boiler bodies being connected to the ash storage tower through a second pipeline, the gas storage tank being connected to the ash storage tower through a third pipeline, the boiler bodies being connected to the feeding hopper through a fourth pipeline, and control valves for controlling the first, second, third, and fourth pipelines being arranged on the pipelines.

[0009] To optimize the above technical solution, the specific measures taken further include:

[0010] Further, the bottom of the boiler body is provided with an air inlet, the top of the boiler body is provided with a feeding inlet, the side wall of the boiler body is provided with an exhaust outlet and an ash conveying outlet, the air inlet is connected to the first pipeline, the feeding inlet is connected to the feeding hopper, the exhaust outlet is connected to the fourth pipeline, and the ash conveying outlet is connected to the second pipeline.

[0011] In a second aspect, the embodiments of the present application further provide a boiler ash removal control method, comprising the following steps:

[0012] Collecting the pressure of the air inlet of the boiler body and the pressure of the ash conveying outlet, and the operation cycle of the warehouse pump;

[0013] Determining the range of the ash removal suspension value domain and the range of the ash removal start value domain according to the operation cycle of the warehouse pump; if the value domain of the air inlet pressure of the boiler body and the ash conveying outlet pressure of the boiler body falls to the range of the ash removal suspension value domain, the ash removal is suspended; if the value domain of the air inlet pressure of the boiler body and the ash conveying outlet pressure of the boiler body rises to the range of the ash removal start value domain, the ash removal is started;

[0014] Wherein, the warehouse pump is arranged on the first pipeline of the boiler body and communicates with the gas storage tank, and the maximum value of the range of the ash removal suspension value domain is less than the minimum value of the range of the ash removal start value domain.

[0015] Further, the operation cycle of the warehouse pump has at least one operation cycle interval, and the range of the ash removal suspension value domain and the range of the ash removal start value domain correspond to each other.

[0016] Further, the operation cycle interval is at least two, and any two operation cycle intervals have no intersection.

[0017] The maximum value of the range of the stop soot blowing value and the minimum value of the range of the start soot blowing value are proportional to the maximum value of the running cycle interval.

[0018] Further, in the same running cycle of the bin pump, the determined range of the stop soot blowing value is less than reference value one, the obtained range of the start soot blowing value is greater than reference value two, and the reference value one is less than the reference value two.

[0019] Further, the soot blowing process further comprises the following steps:

[0020] If the value range of the boiler body air inlet pressure and the boiler body ash outlet pressure is within the range, the injection pressure of the pressurizing valve is adjusted to be proportional to the value range of the boiler body air inlet pressure and the boiler body ash outlet pressure;

[0021] If the value range of the boiler body air inlet pressure and the boiler body ash outlet pressure is less than the minimum value of the range, the pressurizing valve is adjusted to inject at the minimum injection pressure;

[0022] If the value range of the boiler body air inlet pressure and the boiler body ash outlet pressure is greater than the maximum value of the range, the pressurizing valve is adjusted to inject at the maximum injection pressure.

[0023] Further, if the value range of the boiler body air inlet pressure and the boiler body ash outlet pressure is within the range, the injection pressure of the pressurizing valve is adjusted to be linearly related to the value range of the boiler body air inlet pressure and the boiler body ash outlet pressure.

[0024] In a third aspect, an embodiment of the present application further provides a boiler soot blowing control device, comprising,

[0025] A first acquisition module is configured to acquire the boiler body air inlet pressure of a boiler;

[0026] A second acquisition module is configured to acquire the boiler body ash outlet pressure of the boiler;

[0027] A third acquisition module is configured to acquire the running cycle of a bin pump;

[0028] An analysis module is configured to determine a stop soot blowing value range and a start soot blowing value range according to the running cycle of the bin pump;

[0029] A cleaning module is configured to clean the accumulated soot on the boiler body of the boiler;

[0030] The processing module one is used for controlling the cleaning module to stop ash cleaning if the value range of the boiler body air inlet pressure and the boiler body ash conveying port pressure falls into the stop ash cleaning value range, and is used for controlling the cleaning module to start if the value range of the boiler body air inlet pressure and the flue gas outlet pipe pressure rises into the start ash cleaning value range.

[0031] The maximum value of the stop ash cleaning value range interval is less than the minimum value of the start ash cleaning value range interval.

[0032] The processing module two is used for adjusting the jet pressure of the pressurizing valve in proportion to the value range of the boiler body air inlet pressure and the boiler body ash conveying port pressure.

[0033] If the value range of the boiler body air inlet pressure and the boiler body ash conveying port pressure is less than the minimum value of the value range, the processing module two is used for adjusting the pressurizing valve to jet at the minimum jet pressure.

[0034] If the value range of the boiler body air inlet pressure and the boiler body ash conveying port pressure is greater than the maximum value of the value range, the processing module two is used for adjusting the pressurizing valve to jet at the maximum jet pressure.

[0035] Further, the analysis module comprises:

[0036] The storage unit is used for storing the operation cycle of the bin pump, and the corresponding stop ash cleaning value range and start ash cleaning value range under the operation cycle of the bin pump.

[0037] The analysis unit is used for obtaining the stop ash cleaning value range and the start ash cleaning value range from the storage unit according to the operation cycle of the bin pump.

[0038] The embodiment of the present application brings the following beneficial effects:

[0039] The boiler ash cleaning control system, method and device provided by the embodiment of the present application realize the whole-process segmented control of the ash cleaning system control, thereby ensuring the stable operation of the boiler system and ensuring the stable production.

[0040] The control method is applied to the ash removal treatment after the boiler combustion, and comprises collecting the pressure of the boiler body air inlet and the pressure of the ash conveying port, and the running period of the bin pump; the range of the ash removal suspension value domain and the range of the ash removal start value domain are determined according to the running period of the bin pump; if the value domain of the boiler body air inlet pressure and the boiler body ash conveying port pressure falls to the ash removal suspension value domain, the ash removal is suspended; if the value domain of the boiler body air inlet pressure and the boiler body ash conveying port pressure rises to the ash removal start value domain, the ash removal is started. The ash removal control method provided by the embodiment of the present application can automatically adjust the pressure of the pressure valve and the running period of the bin pump according to the pressure difference between the air inlet and the ash conveying port of the boiler after combustion, thereby improving the ash removal effect.

[0041] Other features and advantages of the present disclosure will be set forth in the following description, or will be apparent from the description, or will be learned from practice of the above-mentioned technologies of the present disclosure.

[0042] In order to make the above-mentioned purposes, features and advantages of the present disclosure more obvious and easy to understand, the following preferred embodiments are specifically described below, and the accompanying drawings are described in detail as follows. BRIEF DESCRIPTION OF DRAWINGS

[0043] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or the prior art description. Obviously, the drawings described below are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without any creative labor.

[0044] Figure 1 A structural schematic diagram of a boiler ash removal control system provided by the embodiment of the present application.

[0045] Figure 2 A flowchart of a boiler ash removal control method provided by the embodiment of the present application.

[0046] Figure 3 A module connection schematic diagram of a boiler ash removal control device provided by the embodiment of the present application.

[0047] The drawings are as follows: gas storage tank 10, boiler body 20, air inlet 21, feed inlet 22, exhaust port 23, ash conveying port 24, ash storage tower 30, feed hopper 40, pressure valve 50, exhaust valve 60, anti-blocking valve 70, conveying valve 80, feed valve 90, bin pump 100, collection module one 301, collection module two 302, collection module three 303, analysis module 304, cleaning module 305, processing module one 306. DETAILED DESCRIPTION

[0048] In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions of the present application will be described clearly and completely below with reference to the drawings. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort belong to the scope of protection of the present application.

[0049] In the control system of the ash removal system, ash removal failure often occurs. Generally, the causes of ash removal failure under various working conditions are not judged from the system level, resulting in that a large amount of time is spent in judging the failure point and the failure cause when the ash removal system is shut down, and then the repair can be organized. This constitutes a hidden danger for the long-term stable operation of the boiler. After a single combustion of the boiler ends, the cleaning process is performed, and the operation period of the ash removal in the cleaning process is fixed. However, when the combustion amount increases and the combustion material changes, incomplete ash removal occurs. At this time, the length of time and the time interval of the ash removal need to be adjusted manually, resulting in the problem of low cleaning efficiency.

[0050] Based on this, the boiler ash removal control system provided by the embodiments of the present application is developed based on the process system sequence control and simulation experiments by using the distributed control system on the basis of in-depth research on the ash removal process and failure judgment logic in the process of multiple troubleshooting and repair of the ash removal system, so as to realize the segmented control of the whole process of the ash removal system control and ensure the stable operation of the boiler system and the stable production. At the same time, the time and operation period of the ash removal are adjusted according to the pressure change, thereby improving the ash removal effect.

[0051] In order to facilitate the understanding of the embodiments, first, a boiler ash removal control system disclosed by the embodiments of the present application is introduced in detail.

[0052] As shown in Figure 1 Fig. 1 is a structural schematic diagram of a boiler ash removal control system provided by the embodiments of the present application, which comprises a gas storage tank 10 for storing a gas source, a plurality of boiler bodies 20, an ash storage tower 30, and a feeding hopper 40. The gas storage tank 10 is connected with the plurality of boiler bodies 20 through a first pipeline, the feeding hopper 40 is connected with the boiler bodies 20, the boiler bodies 20 are connected with the ash storage tower 30 through a second pipeline, the gas storage tank 10 is connected with the ash storage tower 30 through a third pipeline, and the boiler bodies 20 are connected with the feeding hopper 40 through a fourth pipeline. Control valves for controlling the corresponding pipelines are arranged on the first pipeline, the second pipeline, the third pipeline and the fourth pipeline, and a warehouse pump 100 is further arranged on the first pipeline and connected with the gas storage tank 10.

[0053] The bottom of the boiler body 20 is provided with an air inlet 21, the top of the boiler body 20 is provided with a feeding inlet 22, the side wall of the boiler body 20 is provided with an exhaust outlet 23 and an ash conveying outlet 24, in order to better control each link of the ash removal system, the connection mode of each connecting port of the boiler body 20 and each pipeline is as follows: the air inlet 21 is connected with the first pipeline, the feeding inlet 22 is connected with a feeding hopper 40, the exhaust outlet 23 is connected with the fourth pipeline, the ash conveying outlet 24 is connected with the second pipeline, and the control valve includes a pressurizing valve 50, an exhaust valve 60, an anti-blocking valve 70, a conveying valve 80 and a feeding valve 90; the pressurizing valve 50 is arranged on the first pipeline, the feeding valve 90 is arranged at the feeding inlet 22, the conveying valve 80 is arranged on the second pipeline, the anti-blocking valve 70 is arranged on the third pipeline, and the exhaust valve 60 is arranged on the fourth pipeline.

[0054] The embodiment of the present application also provides a boiler ash removal control method, and a flowchart of the ash removal control method is shown in the figure, and the method comprises the following steps:

[0055] Step 1: collecting the boiler body air inlet pressure and the ash conveying outlet pressure, and the running period of the bin pump;

[0056] Specifically, the boiler body air inlet pressure is the input pressure supplied to the boiler body in the initial state, and the boiler body ash conveying outlet pressure is the pressure when the gas flows out of the boiler body through the ash conveying outlet. In order to improve the accuracy of the collected data, the air inlet pressure is detected at the boiler body air inlet, and the ash outlet pressure is detected at the boiler body ash conveying outlet.

[0057] Step 2: determining the stop ash removal value domain range and the start ash removal value domain range according to the running period of the bin pump:

[0058] The maximum value of the stop ash removal value domain range is less than the minimum value of the start ash removal value domain range.

[0059] In actual application, the corresponding relationship between the running period of the bin pump and the stop ash removal value domain range and the corresponding relationship between the running period of the bin pump and the start ash removal value domain range are found through multiple simulation experiments, and the stop ash removal value domain range corresponding to the running period of the bin pump and the start ash removal value domain range are determined before the equipment is shipped.

[0060] In actual application, the determined stop ash removal value domain range is not less than a reference value one and the obtained start ash removal value domain range is greater than the reference value one under the same running period of the bin pump. Considering the delay of the detected pressure and the running period, in order to avoid the influence of the delay on the ash removal, the determined stop ash removal value domain range is less than the reference value one and the obtained start ash removal value domain range is greater than a reference value two under the same running period of the bin pump, and the reference value one is less than the reference value two.

[0061] The specific values of the reference value one and the reference value two, and the difference between the reference value one and the reference value two are set according to actual needs, and the embodiment is not limited in this regard.

[0062] Step 3: if the value range of the boiler body air inlet pressure and the boiler body ash conveying port pressure falls to the stop ash removal value range, the ash removal is stopped; if the value range of the boiler body air inlet pressure and the boiler body ash conveying port pressure rises to the start ash removal value range, the ash removal is started:

[0063] It should be noted that the ash accumulation condition of the boiler body is obtained by the value range of the boiler body air inlet pressure and the boiler body ash conveying port pressure, so as to determine whether to start ash removal or stop ash removal. In the initial state, the value range of the boiler body air inlet pressure and the boiler body ash conveying port pressure is the same by default.

[0064] The ash removal method of the boiler provided by the embodiment of the application stops the ash removal by the value range of the boiler body air inlet pressure and the boiler body ash conveying port pressure falling to the stop ash removal value range, and starts the ash removal by the value range of the boiler body air inlet pressure and the boiler body ash conveying port pressure rising to the start ash removal value range. Since the value range of the boiler body air inlet pressure and the boiler body ash conveying port pressure can reflect the ash accumulation condition of the boiler body, the incomplete ash removal condition is effectively avoided. Moreover, the stop ash removal value range and the start ash removal value range are both associated with the operation cycle of the bin pump, the stop ash removal value range and the start ash removal value range are determined under the operation cycle of the bin pump, the accuracy of the stop ash removal value range and the start ash removal value range is improved, the ash removal effect is improved, the incomplete ash removal condition is further avoided, and the effects of efficient ash removal, energy saving and consumption reduction, and saving of consumables are achieved.

[0065] The ash removal method avoids the incomplete ash removal condition, reduces the phenomenon that the ash removal system needs to be stopped due to ash accumulation and then needs to spend a lot of time to determine the fault point and the fault reason, and can avoid the boiler body from being burned due to untimely ash removal, and prolongs the service life of the boiler body.

[0066] Since the operation cycle of the bin pump is prone to change, in order to reduce the adjustment, in the ash removal method, the operation cycle of the bin pump has at least one operation cycle interval, and the stop ash removal value range and the start ash removal value range are both corresponding to the operation cycle interval.

[0067] The number of the operation cycle intervals and the division of the operation cycle intervals are selected according to actual needs, and the embodiment is not limited in this regard. Preferably, the operation cycle intervals are at least two, and any two operation cycle intervals have no intersection; the maximum value of the stop ash removal value range and the minimum value of the start ash removal value range are both proportional to the maximum value of the operation cycle interval.

[0068] In order to avoid too small or too large injection pressure, the injection pressure is controlled to protect the boiler body. Specifically, the method further comprises the steps of: if the value range of the boiler body inlet pressure and the boiler body ash outlet pressure is within the value range, adjusting the injection pressure of the pressure valve to be proportional to the value range of the boiler body inlet pressure and the boiler body ash outlet pressure; if the value range of the boiler body inlet pressure and the boiler body ash outlet pressure is less than the minimum value of the value range, controlling the pressure valve to inject at the minimum injection pressure; and if the value range of the boiler body inlet pressure and the boiler body ash outlet pressure is greater than the maximum value of the value range, controlling the pressure valve to inject at the maximum injection pressure.

[0069] It should be noted that the maximum value of the above-mentioned value range is the maximum value range of the boiler body inlet pressure and the boiler body ash outlet pressure, and the minimum value of the above-mentioned value range is the minimum value range of the boiler body inlet pressure and the boiler body ash outlet pressure. The above-mentioned value range needs to be set according to the actual situation, and the present embodiment does not limit it.

[0070] If the value range of the boiler body inlet pressure and the boiler body ash outlet pressure is within the value range, the injection pressure of the pressure valve is necessarily proportional to the value range of the boiler body inlet pressure and the boiler body ash outlet pressure. For example, if the value range of the boiler body inlet pressure and the boiler body ash outlet pressure is within the value range, the minimum injection pressure of the pressure valve is 190KPa, and the maximum injection pressure of the pressure valve is 260KPa, then 190KPa is the minimum injection pressure of the pressure valve, and 260KPa is the maximum injection pressure of the pressure valve.

[0071] Further, if the value range of the boiler body inlet pressure and the boiler body ash outlet pressure is within the value range, the injection pressure of the pressure valve is linearly related to the value range of the boiler body inlet pressure and the boiler body ash outlet pressure.

[0072] In the above-mentioned ash removal method, by controlling the injection pressure, the boiler body can be effectively protected during the injection process, so that the boiler body is not subjected to continuous high-pressure gas injection, and on-demand injection is achieved.

[0073] Based on the ash removal method provided in the above-mentioned embodiment, the present embodiment further provides a boiler ash removal control device, as shown in Figure 3 The boiler ash removal control device comprises: a first acquisition module 301, a second acquisition module 302, a third acquisition module 303, an analysis module 304, a cleaning module 305, and a first processing module 306.

[0074] The first acquisition module 301 is configured to acquire the boiler body inlet pressure of the boiler.

[0075] The collecting module two 302 is configured to collect the boiler body ash conveying port pressure of the boiler;

[0076] The collecting module three 303 is configured to collect the running period of the bin pump;

[0077] The analyzing module 304 is configured to determine the suspension soot cleaning value domain range and the start soot cleaning value domain range according to the running period of the bin pump;

[0078] The cleaning module 305 is configured to clean the accumulated ash on the boiler body in the boiler. If the value domain of the boiler body air inlet port pressure and the boiler body ash conveying port pressure falls to the suspension soot cleaning value domain range, the processing module one 306 is configured to control the cleaning module to suspend soot cleaning. If the value domain of the boiler body air inlet port pressure and the boiler body ash conveying port pressure rises to the start soot cleaning value domain range, the processing module one is configured to control the cleaning module to start. The bin pump is arranged on the first pipeline of the boiler body and is in communication with the gas storage tank. The maximum value of the suspension soot cleaning value domain range is less than the minimum value of the start soot cleaning value domain range.

[0079] In the above-mentioned soot cleaning device of the boiler, the boiler body air inlet port pressure is the input pressure supplied to the boiler body in the initial state, and the boiler body ash conveying port pressure is the pressure when the gas flows out of the boiler body through the ash conveying port. In order to improve the accuracy of the collected data, the collecting module one is preferably arranged at the boiler body air inlet port to detect the air inlet pressure, and the collecting module two is arranged at the boiler body ash conveying port to detect the ash outlet pressure.

[0080] The types of the collecting module one, the collecting module two and the collecting module three are selected according to actual needs, and the embodiment is not limited in this regard.

[0081] In actual application, the corresponding relationship between the running period of the bin pump and the suspension soot cleaning value domain range and the corresponding relationship between the running period of the bin pump and the start soot cleaning value domain range can be found through experiments, and the suspension soot cleaning value domain range and the start soot cleaning value domain range corresponding to the running period of the bin pump are determined before the equipment is shipped.

[0082] In order to facilitate soot cleaning, the above-mentioned analyzing module comprises a storage unit and an analyzing unit. The storage unit is configured to store the running period of the bin pump and the corresponding suspension soot cleaning value domain range and start soot cleaning value domain range under the running period of the bin pump. The analyzing unit is configured to obtain the suspension soot cleaning value domain range and the start soot cleaning value domain range from the storage unit according to the running period of the bin pump.

[0083] It should be noted that the accumulated ash condition of the boiler body is obtained by the value domain of the boiler body air inlet port pressure and the boiler body ash conveying port pressure, so as to determine whether to start soot cleaning or suspend soot cleaning. In the initial state, the value domain of the boiler body air inlet port pressure and the boiler body ash conveying port pressure is the same by default.

[0084] The ash removal device of the boiler provided by the embodiment of the present application stops the ash removal by reducing the value range of the boiler body air inlet pressure and the boiler body ash conveying port pressure to the stop ash removal value range, and starts the ash removal by increasing the value range of the boiler body air inlet pressure and the boiler body ash conveying port pressure to the start ash removal value range. Since the value range of the boiler body air inlet pressure and the boiler body ash conveying port pressure can reflect the ash deposition condition of the boiler body, the incomplete ash removal condition is effectively avoided. Moreover, the stop ash removal value range and the start ash removal value range are both associated with the operation cycle of the bin pump, and the stop ash removal value range and the start ash removal value range are determined under the operation cycle of the bin pump, so that the accuracy of the stop ash removal value range and the start ash removal value range is improved, the ash removal effect is improved, and the incomplete ash removal condition is further avoided, thereby realizing efficient ash removal, energy saving and consumption reduction, and saving of consumables.

[0085] The ash removal device of the boiler avoids the incomplete ash removal condition, avoids the burning of the boiler body due to the untimely ash removal, and prolongs the service life of the boiler body.

[0086] Since the operation cycle of the bin pump is prone to change, in order to reduce the adjustment, the storage unit stores the operation cycle of the bin pump in the form of an operation cycle interval. The operation cycle interval is at least one, and the stop ash removal value range and the start ash removal value range are both corresponding to the operation cycle interval.

[0087] The number of operation cycle intervals and the division of operation cycle intervals are selected according to actual needs, and the embodiment does not limit this. Preferably, the operation cycle interval is at least two, and any two operation cycle intervals have no intersection. The maximum value of the stop ash removal value range and the minimum value of the start ash removal value range are both proportional to the maximum value of the operation cycle interval.

[0088] In actual application, the determined stop ash removal value range is not less than a reference value one, and the obtained start ash removal value range is greater than the reference value one under the same operation cycle of the bin pump. Since there is a delay in the detection pressure and the operation cycle, in order to avoid the influence of the delay on the ash removal, the determined stop ash removal value range is less than the reference value one, and the obtained start ash removal value range is greater than a reference value two under the same operation cycle of the bin pump, and the reference value one is less than the reference value two.

[0089] The specific values of the reference value one and the reference value two, and the difference between the reference value one and the reference value two are set according to actual needs, and the embodiment does not limit this.

[0090] In order to facilitate the ash removal, the cleaning module is a pressurizing valve for spraying gas to the boiler body to remove the ash. Specifically, the pressurizing valve sprays air to the boiler body. The air is high-pressure air.

[0091] The specific structure of the pressurizing valve is selected according to actual needs, and the embodiment is not limited in this regard.

[0092] In order to avoid too small or too large injection pressure, the injection pressure is controlled to protect the boiler body. Preferably, the above ash removal device of the boiler further comprises a processing module two 307.

[0093] Specifically, if the value range of the boiler body air inlet pressure and the boiler body ash outlet pressure is within the value range, the processing module two is used to control the injection pressure of the pressurizing valve to be proportional to the value range of the boiler body air inlet pressure and the boiler body ash outlet pressure; if the value range of the boiler body air inlet pressure and the boiler body ash outlet pressure is less than the minimum value of the value range, the processing module two is used to control the pressurizing valve to inject at the minimum injection pressure; if the value range of the boiler body air inlet pressure and the boiler body ash outlet pressure is greater than the maximum value of the value range, the processing module two is used to control the pressurizing valve to inject at the maximum injection pressure.

[0094] It should be noted that the maximum value of the above value range is the maximum value range of the boiler body air inlet pressure and the boiler body ash outlet pressure, and the minimum value of the above value range is the minimum value range of the boiler body air inlet pressure and the boiler body ash outlet pressure. The above value range needs to be set according to actual conditions, for example, the value range is 300Pa-900Pa, and the embodiment is not limited in this regard.

[0095] If the value range of the boiler body air inlet pressure and the boiler body ash outlet pressure is within the value range, the injection pressure of the pressurizing valve is necessarily proportional to the value range of the boiler body air inlet pressure and the boiler body ash outlet pressure. For example, if the value range of the boiler body air inlet pressure and the boiler body ash outlet pressure is within the value range, the minimum injection pressure of the pressurizing valve is 190KPa, and the maximum injection pressure of the pressurizing valve is 260KPa, then 190KPa is the minimum injection pressure of the pressurizing valve, and 260KPa is the maximum injection pressure of the pressurizing valve.

[0096] Further, if the value range of the boiler body air inlet pressure and the boiler body ash outlet pressure is within the value range, the processing module two is used to control the injection pressure of the pressurizing valve to be linearly related to the value range of the boiler body air inlet pressure and the boiler body ash outlet pressure.

[0097] In the above ash removal device of the boiler, the injection pressure is controlled by the processing module two, which can effectively protect the boiler body during the injection process, so that the boiler body is not subjected to continuous high-pressure gas injection, and the injection is realized on demand.

[0098] In the above ash removal device of the boiler, the injection unit is controlled to be injected in sequence, which realizes efficient ash removal, protects the boiler body, and reduces the waste of gas.

[0099] As Figure 1 shown, the automatic ash conveying process: open the bin pump, gas through the first pipeline into the boiler body, then detect the pressure value of the boiler body inlet and ash conveying port, judge the pressure range of the boiler body inlet and the boiler body ash conveying port, then start the pressure valve, the gas output to the first pipeline by the bin pump is pressurized to the corresponding conveying pressure set value, then the anti-blocking valve is opened in turn, the feeding valve is opened, the ash cleaning starts, the accumulated ash is conveyed to the ash tower from the ash conveying port, the bin pump pressure drops to the cleaning bin pressure set value, then the anti-blocking valve is closed in turn, the pressure valve is closed, the conveying valve is closed, the ash cleaning is finished. Start feeding and burning, open the exhaust valve and the feeding valve in turn, wait for the feeding time to reach the feeding time set value, then close the feeding valve and the exhaust valve in turn, then start the pressure valve to start conveying, so on and so forth, realize the automatic circulation of ash conveying.

[0100] Finally, it should be noted that: the above-described embodiments, only for the specific embodiments of the present application, to illustrate the technical solutions of the present application, rather than limit it, the protection scope of the present application is not limited to this, although the foregoing detailed description of the present application, those skilled in the art should be understood: any familiar with the technical field of the technical personnel in the technical range disclosed by the present application, it still can be modified or easily thought of changes to the technical solutions recorded in the foregoing examples, or the equivalent replacement of some technical features; and these modifications, changes or replacement, do not make the corresponding technical solutions of the essence of the present application deviate from the spirit and scope of the technical solutions of the embodiments, all should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A soot control system for a boiler, the system comprising: The boiler body is connected with the feed hopper through a fourth pipeline, and the first pipeline, the second pipeline, the third pipeline and the fourth pipeline are all provided with control valves for controlling the corresponding pipelines. The bottom of the boiler body is provided with an air inlet, the top of the boiler body is provided with a feed inlet, the side wall of the boiler body is provided with an exhaust outlet and an ash conveying outlet, the air inlet is connected with the first pipeline, the feed inlet is connected with the feed hopper, the exhaust outlet is connected with the fourth pipeline, and the ash conveying outlet is connected with the second pipeline.

2. A method of controlling the ash deposition of a boiler based on the system for controlling the ash deposition of a boiler according to claim 1, characterized by, The method comprises the following steps: Collecting the pressure of the air inlet of the boiler body and the pressure of the ash conveying outlet of the boiler body, and the running period of the warehouse pump; Determining the range of the value domain of the termination of ash cleaning and the range of the value domain of the start of ash cleaning according to the running period of the warehouse pump; If the value domain of the air inlet pressure of the boiler body and the ash conveying outlet pressure of the boiler body falls to the range of the value domain of the termination of ash cleaning, the ash cleaning is terminated; if the value domain of the air inlet pressure of the boiler body and the ash conveying outlet pressure of the boiler body rises to the range of the value domain of the start of ash cleaning, the ash cleaning is started; The warehouse pump is arranged on the first pipeline of the boiler body and communicates with the gas storage tank, the maximum value of the range of the value domain of the termination of ash cleaning is less than the minimum value of the range of the value domain of the start of ash cleaning.

3. The boiler ash cleaning control method according to claim 2, characterized by: The running period of the warehouse pump has at least one running period interval, and the range of the value domain of the termination of ash cleaning and the range of the value domain of the start of ash cleaning correspond to the running period interval.

4. The method according to claim 3, wherein The running period interval is at least two, and any two running period intervals have no intersection; The maximum value of the range of the value domain of the termination of ash cleaning and the minimum value of the range of the value domain of the start of ash cleaning are directly proportional to the maximum value of the running period interval.

5. The method according to claim 4, wherein Under the same running period of the warehouse pump, the range of the value domain of the termination of ash cleaning determined is less than a reference value one, the range of the value domain of the start of ash cleaning obtained is greater than a reference value two, and the reference value one is less than the reference value two.

6. The method according to claim 5, wherein In the ash cleaning process, the following steps are further included: If the value domain of the air inlet pressure of the boiler body and the ash conveying outlet pressure of the boiler body is within the range, the injection pressure of the pressure valve is adjusted to be directly proportional to the value domain of the air inlet pressure of the boiler body and the ash conveying outlet pressure of the boiler body; If the value domain of the air inlet pressure of the boiler body and the ash conveying outlet pressure of the boiler body is less than the minimum value of the range, the pressure valve is adjusted to inject at the minimum injection pressure; If the value domain of the air inlet pressure of the boiler body and the ash conveying outlet pressure of the boiler body is greater than the maximum value of the range, the pressure valve is adjusted to inject at the maximum injection pressure.

7. The method of claim 6, wherein: If the value range of the boiler body air inlet pressure and the boiler body ash outlet pressure is within the value range, the injection pressure of the pressurizing valve is adjusted to be linearly related to the value range of the boiler body air inlet pressure and the boiler body ash outlet pressure.

8. A boiler ash control device based on the boiler ash control method according to any one of claims 2 to 7, characterized by The method comprises: a first acquisition module, configured to acquire the boiler body air inlet pressure of a boiler; a second acquisition module, configured to acquire the boiler body ash outlet pressure of the boiler; a third acquisition module, configured to acquire the running period of a bin pump; an analysis module, configured to determine the suspension ash cleaning value range and the start ash cleaning value range according to the running period of the bin pump; a cleaning module, configured to clean the accumulated ash on the boiler body of the boiler; a first processing module, configured to control the cleaning module to suspend ash cleaning if the value range of the boiler body air inlet pressure and the boiler body ash outlet pressure falls to the suspension ash cleaning value range, and to control the cleaning module to start if the value range of the boiler body air inlet pressure and the boiler body ash outlet pressure rises to the start ash cleaning value range; wherein the bin pump is arranged on a first pipeline of the boiler body and is in communication with a gas storage tank, the maximum value of the suspension ash cleaning value range is less than the minimum value of the start ash cleaning value range; a second processing module, configured to adjust the injection pressure of the pressurizing valve to be directly proportional to the value range of the boiler body air inlet pressure and the boiler body ash outlet pressure; if the value range of the boiler body air inlet pressure and the boiler body ash outlet pressure is less than the minimum value of the value range, the second processing module is configured to adjust the pressurizing valve to inject at the minimum injection pressure; if the value range of the boiler body air inlet pressure and the boiler body ash outlet pressure is greater than the maximum value of the value range, the second processing module is configured to adjust the pressurizing valve to inject at the maximum injection pressure.

9. The sootblowing control apparatus of claim 8, wherein: The analysis module comprises: a storage unit, configured to store the running period of the bin pump, and the corresponding suspension ash cleaning value range and start ash cleaning value range under the running period of the bin pump; an analysis unit, configured to obtain the suspension ash cleaning value range and the start ash cleaning value range from the storage unit according to the running period of the bin pump.

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