CN117029022A - An indirect cooling slag water self-balancing method and system for slag scooping machines - Google Patents
An indirect cooling slag water self-balancing method and system for slag scooping machines Download PDFInfo
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- CN117029022A CN117029022A CN202311092945.6A CN202311092945A CN117029022A CN 117029022 A CN117029022 A CN 117029022A CN 202311092945 A CN202311092945 A CN 202311092945A CN 117029022 A CN117029022 A CN 117029022A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J1/00—Removing ash, clinker, or slag from combustion chambers
- F23J1/06—Mechanically-operated devices, e.g. clinker pushers
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Program-control systems
- G05B19/02—Program-control systems electric
- G05B19/04—Program control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Program control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
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Abstract
本发明属于捞渣机控制领域，提供间接冷却的捞渣机渣水自平衡方法及系统。间接冷却的捞渣机渣水自平衡方法包括当实时积渣高度和捞渣机的运行时长中的任一者满足积渣处理开启条件时，控制积渣处理操作开启；当捞渣机水箱内的水位低于水箱最低液位时，控制自动补水阀开启，直至捞渣机水箱内的水位达到水箱最高液位时，控制自动补水阀关闭；当捞渣机水箱内的水温大于水箱内允许最高水温时，控制自动补水阀开启，补水至清水池；在清水池内的液位升至清水池最高液位前，若捞渣机水箱内水温降至水箱内允许最高水温，则控制自动补水阀关闭；若在清水池内的液位升至清水池最高液位时，捞渣机水箱内水温仍大于水箱内允许最高水温，则控制自动补水阀关闭。
The invention belongs to the field of slag scooping machine control and provides an indirect cooling slag scooping machine slag water self-balancing method and system. The indirect cooling slag water self-balancing method of the slag scooper includes controlling the start of the slag accumulation treatment operation when either the real-time slag accumulation height or the operation time of the slag scooper satisfies the conditions for starting the slag accumulation treatment; when the water tank of the slag scooper is When the water level is lower than the lowest level in the water tank, the automatic water replenishment valve is controlled to open until the water level in the water tank of the slag fishing machine reaches the maximum liquid level of the water tank, and the automatic water replenishment valve is controlled to close; when the water temperature in the water tank of the slag fishing machine is greater than the maximum allowed in the water tank When the water temperature is high, the automatic water replenishment valve is controlled to open and replenish water to the clear pool; before the liquid level in the clean water pool rises to the highest level of the clean pool, if the water temperature in the water tank of the slag scooper drops to the maximum allowable water temperature in the water tank, the automatic water replenishment valve is controlled to close. ; If the water temperature in the water tank of the slag scooper is still greater than the maximum allowable water temperature in the water tank when the liquid level in the clean water tank rises to the highest level in the clean water tank, the automatic water replenishment valve will be controlled to close.
Description
Technical Field
The invention belongs to the field of slag conveyor control, and particularly relates to a slag water self-balancing method and system of an indirect cooling slag conveyor.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
The existing slag conveyor cooling water and overflow water treatment technology comprises the following modes:
(1) The self-balancing method of the cooling water of the slag extractor, which does not carry out special treatment on overflow water, determines the water supplementing amount by counting the consumption of the cooling slag water of the slag extractor. If overflow water exists, the overflow water overflows to a slag water regulating tank, and is pumped to a slag dragging machine for recycling after being cooled in the regulating tank. The method is insufficient in its capability to cope with a sudden increase in the slag quantity. When the boiler is in the working conditions of soot blowing, or a large amount of coking and the like, the slag discharge amount can be suddenly increased, the water temperature in the water tank of the slag extractor can be suddenly increased, the water level is rapidly increased to the highest water level, a large amount of overflow water can be generated, and the water temperature of the overflow water is higher. Because the temperature of the overflow water is higher at this time, even if the overflow water is sent back to the slag dragging machine, the cooling effect cannot be achieved, and in order to reduce the temperature of the slag water in the water tank, the part of high-temperature overflow water must be drained so as to leave the slag water regulating tank to accommodate new overflow water. Therefore, in the case of sudden increase of slag content, the system is required to continuously discharge slag-containing wastewater. In addition, the bottom of the water tank can be continuously accumulated with slag, and when the water quantity is suddenly increased and the accumulated slag suddenly increases, the pump suction inlet can be buried by the slag and cannot work normally, so the accumulated slag needs to be cleaned manually and regularly.
(2) An indirect heat exchanger is added to the slag dragging machine body, slag water is cooled by cooling water, the cooling water is not in direct contact with the slag water, and the heat exchanger is arranged in a water tank; the method is also insufficient in its ability to cope with a sudden increase in the amount of slag. According to the method, no overflow water treatment system is arranged, namely no overflow water is considered, but when the slag quantity is suddenly increased in practice, the water level in the water tank of the slag dragging machine is increased except for the water temperature, so that the water level is increased, and the situation that the overflow water directly overflows out of the slag dragging machine to flow to the ground is easily caused. The heat exchanger in the technology is always soaked in slag water, so that abrasion and corrosion are very easy to cause, the service life of the heat exchanger is not well ensured, and the heat exchanger needs to be replaced frequently. If the Ca content in the coal ash is higher, the scale cleaning is not good when the outer wall structure of the heat exchanger and the heat exchange efficiency are reduced. Because the heat exchanger bubbles are in the slag water and are positioned below the slag falling port of the boiler, the heat exchanger can be cleaned only when the hydraulic door of the slag falling port is closed and the high-temperature slag is blocked, and the state generally cannot exceed 4 hours, so that the operation time is seriously insufficient.
(3) The external direct cooling system for slag water leads overflow water to a cooler, the cooler is provided with a guide plate and a pore plate, the overflow water is cooled by cooling air, and the cooled overflow water is pumped back to the slag dragging machine. No trench and no slag pool are arranged. The technical scheme has the following defects: the cooling air absorbs heat and is directly discharged to the boiler room, so that the temperature of the boiler room area is increased, and the personnel environment is deteriorated. When the overflow water contains slag particles, especially a large amount of slag falls, the slag falls and stirs the slag water, the slag content in the water can be increased sharply, the pore plate is easy to be blocked, the water flowing of the cooler is not smooth, and the overhaul and maintenance workload is increased. The system is not reliable enough, and when the cooler orifice plate is blocked or the pump fails, no spare overflow water treatment measures are available.
(4) The slag water external indirect cooling system is characterized in that overflow water overflows to a sewage tank, clear water is led to a clear water tank after precipitation, water in the clear water tank is pumped to a cooler, the cooler is an indirect cooler, cooling water is not in direct contact with the slag water, and cooled overflow water is returned to a slag dragging machine through a jet flow component. Meanwhile, a dust collection assembly is additionally arranged on the jet flow assembly for dust collection. The technical scheme has the following defects: the cooler is required to be put into operation all the time, so that the scaling and blocking frequency of the cooler is increased, and the overhaul and maintenance workload is increased. The overflow water adopts a natural overflow mode from the sewage pool to the clean water pool, when a large amount of slag is discharged from the boiler, the overflow water amount is suddenly increased, the natural overflow effect is poor, the water in the clean water pool also contains slag, and the cooler is easy to be blocked. The slag deposited at the bottom of the sewage pool needs to be cleaned manually and regularly. The slag scooping machine is a wet slag removing system, slag is soaked in water and fished out, so that the engineering boiler room using the slag scooping machine has no dust raising problem, and a dust collection assembly is not necessary.
In summary, the existing slag extractor cooling water and overflow water treatment technology has insufficient coping capability for a sudden large amount of slag discharging working conditions, the cooling system is frequently put in, and the cooler is easy to be blocked when a large amount of slag is discharged from a boiler, so that the cooling system is reduced, and the operation stability of the indirect cooling slag extractor is poor.
Disclosure of Invention
In order to solve the technical problems in the background art, the invention provides a slag water self-balancing method and a slag water self-balancing system of an indirect cooling slag dragging machine, which can improve the coping capacity of a boiler under a large amount of slag discharging working conditions suddenly, reduce the input times of a cooling system, prolong the service life of the cooling system and improve the reliability and the stability of the system.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the first aspect of the invention provides a slag water self-balancing method of an indirectly cooled slag dragging machine.
An indirect cooling slag dragging machine slag water self-balancing method comprises the following steps:
acquiring the slag accumulation height in the sewage pool, the running time of the slag dragging machine, the water level and the water temperature in the water tank of the slag dragging machine and the water level in the clean water pool in real time;
when any one of the real-time slag accumulation height and the operation time of the slag dragging machine meets the slag accumulation treatment starting condition, controlling the slag accumulation treatment operation to be started;
when the water level in the water tank of the slag conveyor is lower than the lowest water level of the water tank, controlling the automatic water supplementing valve to be opened, and controlling the automatic water supplementing valve to be closed until the water level in the water tank of the slag conveyor reaches the highest water level of the water tank;
when the water temperature in the water tank of the slag dragging machine is higher than the highest allowable water temperature in the water tank, controlling an automatic water supplementing valve to be opened, and supplementing water to a clean water tank; before the liquid level in the clean water tank rises to the highest liquid level in the clean water tank, if the water temperature in the water tank of the slag dragging machine falls to the highest allowable water temperature in the water tank, the automatic water supplementing valve is controlled to be closed; if the water temperature in the water tank of the slag dragging machine is still higher than the allowable maximum water temperature in the water tank when the liquid level in the clean water tank rises to the maximum liquid level in the clean water tank, the automatic water supplementing valve is controlled to be closed, and the clean water pump in the clean water pump tank is controlled to be started.
Wherein, the starting conditions of slag accumulation treatment are as follows:
the slag accumulation height is larger than the highest slag accumulation value;
or the operation time length of the slag dragging machine is longer than the maintenance period time limit.
As an embodiment, the slag water self-balancing method of the indirectly cooled slag dragging machine further comprises the following steps:
acquiring the water temperature in the clean water tank in real time; in the running process of the clear water pump, if the water temperature in the clear water tank is higher than the allowable highest water temperature entering the slag dragging machine water tank from the clear water tank, cooling clear water in the clear water tank and then sending the clear water to the slag dragging machine water tank, otherwise, directly sending the clear water in the clear water tank back to the slag dragging machine water tank.
The technical scheme has the advantages that the input times of the cooling system are reduced by automatically monitoring the water temperature in the clean water tank, and the service life of the cooling system is prolonged.
As one implementation mode, when the liquid level in the clean water tank is lower than the lowest liquid level in the clean water tank, the clean water pump is controlled to stop.
As one implementation mode, after the clear water pump is stopped, if the water temperature in the water tank of the slag dragging machine is still higher than the maximum allowable water temperature in the water tank, the automatic water supplementing valve is continuously controlled to be opened until the water temperature in the water tank of the slag dragging machine is smaller than or equal to the maximum allowable water temperature in the water tank.
The technical scheme has the advantages that the water temperature in the water tank of the slag dragging machine is controlled by utilizing the automatic water supplementing valve, and the balance of the water level and the water temperature is ensured.
As an implementation mode, the process of cooling clear water in the clear water pond is as follows:
sending clear water in a clear water tank to cooling equipment for cooling;
and when at least two cooling devices are connected in parallel, the device with long maintenance time from the last overhaul is preferentially selected to be started.
The technical scheme has the advantages that the stability of the whole system is improved by preferentially selecting and starting equipment with long time from the last overhaul and maintenance.
As one implementation mode, when the real-time water level in the clean water tank rises to the highest water level in the clean water tank, the clean water pump in the clean water pump tank is controlled to be started.
The second aspect of the invention provides a slag water self-balancing system of an indirectly cooled slag conveyor.
An indirectly cooled slag conveyor slag water self-balancing system, comprising:
the accumulated slag height detection module is used for detecting the accumulated slag height in the sewage tank in real time;
the operation timing module is used for counting the operation time of the slag dragging machine in real time;
the water level detection module is used for detecting the water level in the water tank of the slag conveyor and the water level in the clean water tank in real time;
the water temperature detection module is used for detecting the water temperature in the water tank of the slag conveyor in real time;
the controller is respectively connected with the slag accumulation height detection module, the operation timing module, the water level detection module and the water temperature detection module; the controller comprises a sewage pool slag accumulation control module and a slag dragging machine water tank control module;
the sewage pool slag accumulation control module is used for controlling the slag accumulation treatment operation to be started when any one of the real-time slag accumulation height and the operation duration of the slag dragging machine meets the slag accumulation treatment starting condition;
the slag conveyor water tank control module is used for:
when the water level in the water tank of the slag conveyor is lower than the lowest water level of the water tank, controlling the automatic water supplementing valve to be opened, and controlling the automatic water supplementing valve to be closed until the water level in the water tank of the slag conveyor reaches the highest water level of the water tank;
when the water temperature in the water tank of the slag dragging machine is higher than the highest allowable water temperature in the water tank, controlling an automatic water supplementing valve to be opened, and supplementing water to a clean water tank; before the liquid level in the clean water tank rises to the highest liquid level in the clean water tank, if the water temperature in the water tank of the slag dragging machine falls to the highest allowable water temperature in the water tank, the automatic water supplementing valve is controlled to be closed; if the water temperature in the water tank of the slag dragging machine is still higher than the allowable maximum water temperature in the water tank when the liquid level in the clean water tank rises to the maximum liquid level in the clean water tank, the automatic water supplementing valve is controlled to be closed, and the clean water pump in the clean water pump tank is controlled to be started.
As an embodiment, the controller further includes: the overflow water control module is used for acquiring the water temperature in the clean water tank in real time; in the running process of the clear water pump, if the water temperature in the clear water tank is higher than the allowable highest water temperature entering the slag dragging machine water tank from the clear water tank, cooling clear water in the clear water tank and then sending the clear water to the slag dragging machine water tank, otherwise, directly sending the clear water in the clear water tank back to the slag dragging machine water tank.
As an embodiment, the overflow water control module is further configured to: and when the liquid level in the clean water tank is lower than the lowest liquid level in the clean water tank, controlling the clean water pump to stop.
As an embodiment, the overflow water control module is further configured to: after the clear water pump is stopped, if the water temperature in the water tank of the slag extractor is still higher than the maximum allowable water temperature in the water tank, the automatic water supplementing valve is continuously controlled to be opened until the water temperature in the water tank of the slag extractor is lower than or equal to the maximum allowable water temperature in the water tank.
Compared with the prior art, the invention has the beneficial effects that:
(1) According to the invention, through detecting the slag accumulation height and the operation time of the slag dragging machine in real time, judging whether any one of the slag accumulation processing starting conditions is met, if so, controlling the slag accumulation processing operation to be started, and when the boiler is subjected to slag discharge in a large quantity suddenly, automatically determining that the slag water cooling system is put into operation, ensuring the discharge of slag-free wastewater, and improving the coping capability of the boiler in the slag discharge working condition suddenly in a large quantity.
(2) According to the invention, through automatically controlling the slag accumulation in the sewage pool, the water level and the water temperature of the water tank of the slag dragging machine and the overflow water condition in the clean water pool, the water supplementing of the whole slag removal system, the operation of the slag water cooling system and the like are automatically determined, no manual operation is required, and the automation level of the whole slag removal system is improved.
Additional aspects of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention.
FIG. 1 is a schematic diagram of a slag water self-balancing system of an indirectly cooled slag conveyor according to an embodiment of the invention;
FIG. 2 is a flow chart illustrating a method for controlling the self-balancing of the slag water of the indirect cooling slag conveyor according to the embodiment of the invention.
Detailed Description
The invention will be further described with reference to the drawings and examples.
It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the invention. 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 invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present invention. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
Term interpretation:
the slag extractor is also called as a water immersion type scraper slag extractor, and refers to mechanical equipment for immersing and cooling high-temperature slag by means of a water tank with a certain water depth, removing wet slag Dan Zong in a slag-water mixture by using a scraper chain in closed circulation motion, and removing part of water.
Slag water: also known as cold slag water, slag-containing water, including water in the tank of the dragveyer and overflow water.
Overflow water: and overflowing the water outside the water tank of the slag dragging machine when the water level of the slag dragging machine rises to the highest point.
Example 1
Setting the highest water level Lmax of the water tank, the lowest water level Lmin of the water tank and the allowable highest water temperature T2 in the water tank; setting the highest liquid level Hmax of the clean water tank, the lowest liquid level Hmin of the clean water tank and the allowable highest water temperature T1 of the water tank of the slag conveyor from the clean water tank; setting the highest value Nmax and the lowest value Nmin of the underwater accumulated slag in the sewage pool; the water in the water tank of the slag conveyor is filled, and the water level is positioned between the highest water level Lmax and the lowest water level Lmin of the water tank.
With reference to fig. 1 and 2, this embodiment provides a slag water self-balancing method of an indirectly cooled slag dragging machine, including:
step 1: and acquiring the slag accumulation height in the sewage pool, the running time of the slag dragging machine, the water level and the water temperature in the water tank of the slag dragging machine and the water level in the clean water pool in real time.
In the specific implementation process, a liquid level measuring device is arranged in a water tank of the slag dragging machine, and the liquid level L of the water tank is monitored;
a temperature measuring device is arranged in a water tank of the slag dragging machine, and the water temperature Tx in the water tank is monitored;
a liquid level measuring device is arranged in the clean water tank to monitor the liquid level H of the clean water tank;
a temperature measuring device is arranged in the clean water tank to monitor the water temperature Tc in the clean water tank;
a low material level Nmin is set in the sewage tank.
An interface instrument is arranged on the sewage tank, the water slag accumulation height N in the sewage tank is monitored, when the slag accumulation is fast full, the stirrer and the slag discharge pump are started successively, the slag accumulation is sent to the slag bin, and when the material level is reduced to Nmin, the automatic stop is realized.
Step 2:
when any one of the real-time slag accumulation height and the operation time of the slag conveyor meets the slag accumulation processing starting condition, controlling the slag accumulation processing operation to be started.
Wherein, the starting conditions of slag accumulation treatment are as follows:
the slag accumulation height is larger than the highest slag accumulation value;
or the operation time length of the slag dragging machine is longer than the maintenance period time limit.
When the water level in the water tank of the slag conveyor is lower than the lowest water level of the water tank, controlling the automatic water supplementing valve to be opened, and controlling the automatic water supplementing valve to be closed until the water level in the water tank of the slag conveyor reaches the highest water level of the water tank;
when the water temperature in the water tank of the slag dragging machine is higher than the highest allowable water temperature in the water tank, controlling an automatic water supplementing valve to be opened, and supplementing water to a clean water tank; before the liquid level in the clean water tank rises to the highest liquid level in the clean water tank, if the water temperature in the water tank of the slag dragging machine falls to the highest allowable water temperature in the water tank, the automatic water supplementing valve is controlled to be closed; if the water temperature in the water tank of the slag dragging machine is still higher than the allowable maximum water temperature in the water tank when the liquid level in the clean water tank rises to the maximum liquid level in the clean water tank, the automatic water supplementing valve is controlled to be closed, and the clean water pump in the clean water pump tank is controlled to be started.
When the boiler is in normal slag discharge, the water temperature Tx in the water tank can be maintained to be not more than the allowable highest water temperature T2 in the water tank; when the water level L is lower than the lowest water level Lmin of the water tank, the automatic water supplementing valve is opened, and when the water level L in the water tank of the slag dragging machine is increased to the highest water level Lmax of the water tank, the automatic water supplementing valve is closed, so that the effect of periodically updating the water in the water tank can be achieved.
When the slag quantity of the boiler is increased by a small amount, the water level L in the water tank of the slag conveyor rises, the water temperature Tc in the clean water tank rises, the evaporation quantity is increased, and once the water temperature exceeds the allowable maximum water temperature T2 in the water tank or the water level of the water tank is reduced to the lowest water level Lmin of the water tank, the automatic water supplementing valve is opened. If overflow water overflows at this moment, because the slag discharge amount is not increased much, the overflow water is also less, the overflow water has enough time to naturally cool in the sewage pool and the clean water pool, and the water temperature does not exceed the allowable highest water temperature T1 entering the slag conveyor water tank from the clean water pool. After the water level in the clean water tank rises to the highest water level Hmax of the clean water tank, the clean water pump directly sends back the water tank of the slag dragging machine, which is equivalent to increasing the supply of cold slag water, and is beneficial to reducing Tx below the allowable highest water temperature T2 in the water tank as soon as possible. When the water temperature Tx in the water tank is less than the allowable highest water temperature T2 in the water tank and the water level L in the water tank of the slag conveyor is less than the highest water level Lmax of the water tank, the automatic water supplementing valve is closed.
In a specific implementation process, the slag water self-balancing method of the indirectly cooled slag dragging machine further comprises the following steps:
acquiring the water temperature in the clean water tank in real time; in the running process of the clear water pump, if the water temperature in the clear water tank is higher than the allowable highest water temperature entering the slag dragging machine water tank from the clear water tank, cooling clear water in the clear water tank and then sending the clear water to the slag dragging machine water tank, otherwise, directly sending the clear water in the clear water tank back to the slag dragging machine water tank.
The process of cooling clear water in the clear water pond is as follows:
sending clear water in a clear water tank to cooling equipment for cooling;
and when at least two cooling devices are connected in parallel, the device with long maintenance time from the last overhaul is preferentially selected to be started. Therefore, the stability of the whole system is improved by preferentially selecting and starting equipment with long maintenance time from the last overhaul.
For example: when the slag quantity of the boiler is greatly increased, the water level L in the water tank of the slag conveyor rises, the water temperature Tc in the clean water tank can be rapidly increased to be higher than the allowable highest water temperature T2 in the water tank, and the automatic water supplementing valve is opened. When overflow water overflows, the slag discharge amount is increased greatly, the overflow water is large in amount and high in water temperature, the overflow water is not cooled naturally in the sewage pool and the clean water pool for enough time, and the water temperature can exceed the allowable highest water temperature T1 of the water tank of the slag conveyor from the clean water pool. At the moment, after the water level in the clean water tank rises to the highest liquid level Hmax of the clean water tank, the clean water is pumped to the electric water filter to remove slag particles, and then the electric water filter enters the shell-and-tube heat exchanger; the valve of the cooling water passage of the shell-and-tube heat exchanger is opened to provide cooling water, the cooling water exchanges heat with high-temperature overflow water, the temperature of the high-temperature overflow water is reduced to be lower than the allowable maximum water temperature T1 of the slag conveyor water tank from the clean water tank, and then the low-temperature overflow water enters the slag conveyor water tank again. When the water temperature TcTcTc in the clean water tank is smaller than the allowable highest water temperature T1 entering the slag dragging machine water tank from the clean water tank, overflow water does not enter the water filter and the heat exchanger any more, but directly enters the slag dragging machine water tank. When the water temperature Tx in the water tank is less than the allowable highest water temperature T2 in the water tank, the automatic water supplementing valve is closed.
According to the technical scheme, the water temperature in the clean water tank is automatically monitored, so that the input times of the cooling system are reduced, and the service life of the cooling system is prolonged.
And when the liquid level in the clean water tank is lower than the lowest liquid level in the clean water tank, controlling the clean water pump to stop. After the clear water pump is stopped, if the water temperature in the water tank of the slag extractor is still higher than the maximum allowable water temperature in the water tank, the automatic water supplementing valve is continuously controlled to be opened until the water temperature in the water tank of the slag extractor is lower than or equal to the maximum allowable water temperature in the water tank. When the real-time water level in the clean water tank rises to the highest water level in the clean water tank, the clean water pump in the clean water pump tank is controlled to start. Therefore, the water temperature in the water tank of the slag conveyor is controlled by utilizing the aspect of the automatic water supplementing valve, and the balance of the water level and the water temperature is ensured.
In some specific implementation processes, when more slag is accumulated in the sewage pool, when the accumulated slag height N is more than or equal to the accumulated slag maximum value Nmax and an alarm is given, an electric stirrer and a slag discharge pump are started in sequence, and the accumulated slag is sent to a slag bin; and stopping the operation of the electric stirrer and the slag discharge pump until the slag accumulation height N=the slag accumulation minimum value Nmin.
Example two
With reference to fig. 1 and 2, this embodiment provides an indirectly cooled slag extractor slag water self-balancing system, including: the device comprises a slag accumulation height detection module, an operation timing module, a water level detection module, a water temperature detection module and a controller.
The accumulated slag height detection module is used for detecting the accumulated slag height in the sewage tank in real time;
the operation timing module is used for counting the operation time of the slag dragging machine in real time;
the water level detection module is used for detecting the water level in the water tank of the slag conveyor and the water level in the clean water tank in real time;
the water temperature detection module is used for detecting the water temperature in the water tank of the slag conveyor in real time.
It should be noted that, the slag accumulation height detection module, the operation timing module, the water level detection module and the water temperature detection module may be implemented by using existing sensing elements or devices, and specific models thereof may be specifically selected by those skilled in the art according to actual precision requirements, which will not be described in detail herein.
In this embodiment, the controller is connected to the slag accumulation height detection module, the operation timing module, the water level detection module and the water temperature detection module respectively; the controller comprises a sewage pool slag accumulation control module and a slag dragging machine water tank control module.
Specifically, the sewage pool slag accumulation control module is used for controlling the slag accumulation treatment operation to be started when any one of the real-time slag accumulation height and the operation duration of the slag dragging machine meets the slag accumulation treatment starting condition.
Wherein, the starting conditions of slag accumulation treatment are as follows:
the slag accumulation height is larger than the highest slag accumulation value;
or the operation time length of the slag dragging machine is longer than the maintenance period time limit.
For example: when more accumulated slag is accumulated in the sewage pool, and the accumulated slag height N is more than or equal to the accumulated slag highest value Nmax, an electric stirrer and a slag discharging pump are started successively, the accumulated slag is sent to a slag bin until the material level is reduced to Nmin, and the electric stirrer and the slag discharging pump stop running.
The slag conveyor water tank control module is used for:
when the water level in the water tank of the slag conveyor is lower than the lowest water level of the water tank, controlling the automatic water supplementing valve to be opened, and controlling the automatic water supplementing valve to be closed until the water level in the water tank of the slag conveyor reaches the highest water level of the water tank;
when the water temperature in the water tank of the slag dragging machine is higher than the highest allowable water temperature in the water tank, controlling an automatic water supplementing valve to be opened, and supplementing water to a clean water tank; before the liquid level in the clean water tank rises to the highest liquid level in the clean water tank, if the water temperature in the water tank of the slag dragging machine falls to the highest allowable water temperature in the water tank, the automatic water supplementing valve is controlled to be closed; if the water temperature in the water tank of the slag dragging machine is still higher than the allowable maximum water temperature in the water tank when the liquid level in the clean water tank rises to the maximum liquid level in the clean water tank, the automatic water supplementing valve is controlled to be closed, and the clean water pump in the clean water pump tank is controlled to be started.
In the slag extractor water tank control module, when the water level L of the slag extractor water tank is lower than the lowest water level Lmin of the water tank, an automatic water supplementing valve is opened until the water level rises to the highest water level Lmax of the water tank, and the automatic water supplementing valve is closed; when the water temperature Tx in the water tank of the slag conveyor is higher than the allowable highest water temperature T2 in the water tank, the automatic water supplementing valve is opened. If the water level H in the clean water tank rises to the highest water level Hmax of the clean water tank, and if the water temperature Tx in the water tank of the slag dragging machine falls to the highest allowable water temperature T2 in the water tank, the automatic water supplementing valve is closed; if the water level H in the water tank rises to the highest water level Hmax of the clean water tank, and the water temperature Tx in the water tank is still larger than the allowable highest water temperature T2 in the water tank, the automatic water supplementing valve is closed, and the overflow water control module intervenes in working.
In some implementations, the controller further includes: the overflow water control module is used for acquiring the water temperature in the clean water tank in real time; in the running process of the clear water pump, if the water temperature in the clear water tank is higher than the allowable highest water temperature entering the slag dragging machine water tank from the clear water tank, cooling clear water in the clear water tank and then sending the clear water to the slag dragging machine water tank, otherwise, directly sending the clear water in the clear water tank back to the slag dragging machine water tank.
In some implementations, the overflow control module is further configured to: and when the liquid level in the clean water tank is lower than the lowest liquid level in the clean water tank, controlling the clean water pump to stop.
Wherein, overflow water control module still is used for: after the clear water pump is stopped, if the water temperature in the water tank of the slag extractor is still higher than the maximum allowable water temperature in the water tank, the automatic water supplementing valve is continuously controlled to be opened until the water temperature in the water tank of the slag extractor is lower than or equal to the maximum allowable water temperature in the water tank.
For example:
in the overflow water control module, when the liquid level H of the clean water tank rises to the highest liquid level Hmax of the clean water tank, a clean water pump in the clean water pump tank is started. At this time, the clear water tank water temperature Tc is judged.
And if Tc is less than or equal to the allowable maximum water temperature T1 entering the slag conveyor water tank from the clean water tank, switching the valve to send the clean water in the clean water tank back to the slag conveyor water tank, wherein the clear water is in a default state.
If Tc is greater than the allowable highest water temperature T1 entering the slag conveyor water tank from the clean water tank, the clean water in the clean water tank is sent to the electric water filter-shell-and-tube heat exchanger through valve switching, and meanwhile, a cooling water inlet valve is opened to supply cooling water to the heat exchanger. The electric water filter and the shell-and-tube heat exchanger are particularly put into one device, and the system determines according to equipment overhaul and maintenance records, so that equipment with long overhaul and maintenance time from the last time is preferentially selected. Thus, the water in the clean water tank enters the water tank of the slag dragging machine after being cooled.
Until the liquid level H in the clean water tank is lower than the lowest liquid level Hmin of the clean water tank, the clean water pump is stopped, and the cooling water supply valve is closed. At the moment, if the water temperature Tx in the water tank of the slag dragging machine is less than or equal to the maximum allowable water temperature T2 in the water tank, the module stops acting, and the related valve is switched to a default state; if the water temperature Tx in the slag extractor water tank is still greater than the allowable highest water temperature T2 in the water tank, continuously monitoring the water level L and the water temperature Tx in the slag extractor water tank until the water temperature Tx in the slag extractor water tank is less than or equal to the allowable highest water temperature T2 in the water tank.
The technical scheme of the embodiment has the following advantages:
(1) The embodiment improves the capability of coping with the sudden and large-scale slag discharge of the boiler, and can ensure that the system has no slag-containing wastewater discharge even if the boiler is subjected to the sudden and large-scale slag discharge for a long time. When the boiler normally deslagges or the deslagging amount is increased by a small amount, the automatic control is used for realizing the self-balancing of slag and water; when a large amount of slag is discharged for a long time suddenly from the boiler, a large amount of slag-containing wastewater can be discharged, and the technical scheme is provided with the slag-water indirect cooling system, so that the slag-water indirect cooling system can be automatically put into operation, and the slag-water cooled slag is returned to the slag dragging machine for recycling, so that the slag-containing wastewater is always discharged.
And (2) the embodiment realizes the effects of automatically judging whether the cooling system is put into operation and prolonging the service life of the cooling system, if and only if the slag water is fully supplemented to the slag dragging machine and the clean water tank, and the slag water cooling system is put into operation when the slag water temperature in the slag dragging machine still exceeds the allowable value, and the slag water cooling system automatically stops putting into operation after the slag water temperature in the slag dragging machine is lower than the allowable value, so that the number of times and the time of putting into operation of the slag water cooling system are reduced as much as possible on the premise of ensuring the safe and stable operation of the system, and the service life of the cooling system is prolonged.
(3) The embodiment improves the reliability and stability of the system. As shown in figure 1, a special electric residue filter is arranged in front of the slag water cooler, so that the cooler is effectively prevented from being blocked when a large amount of slag is discharged from the boiler, the cooling effect is improved, and no slag-containing wastewater is discharged during system operation. Meanwhile, as shown in fig. 1, when the electric water filter and the shell-and-tube heat exchanger are respectively connected in parallel for use, equipment with long time for overhauling and maintaining last time is selected to be put into operation according to the system priority, so that the stability of the system operation can be effectively ensured.
(4) The embodiment improves the automation level of the whole deslagging system. The water supplementing of the whole deslagging system, the operation of the slag water cooling system and the like can be automatically carried out according to the control logic of the technical scheme.
(5) The slag extractor water tank control module and the overflow water control module of the embodiment are related by judging whether the water temperature Tx of the slag extractor water tank exceeds the allowable highest water temperature T2 in the allowable water tank, namely when water in a pool is emptied and the water in the slag extractor water tank is still over-temperature, the automatic water supplementing valve of the slag extractor is started again, new cold slag water is supplemented into the whole system, and a new round of judgment cycle is carried out. Therefore, an automatic control module of the whole system can be constructed into a whole which runs stably, all the judgment is automatically carried out, and the running stability and safety of the slag dragging machine can be further ensured.
(6) The embodiment reduces the workload of field operators. The whole deslagging system automatically operates, and no additional manual participation is needed in the operation process; automatic identification is realized when the accumulated slag at the bottom of the sewage pool is more, and the accumulated slag is directly sent to a slag bin for loading and outward transportation through electric equipment, so that manual cleaning is not needed.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. An indirect cooling slag dragging machine slag water self-balancing method is characterized by comprising the following steps of:
acquiring the slag accumulation height in the sewage pool, the running time of the slag dragging machine, the water level and the water temperature in the water tank of the slag dragging machine and the water level in the clean water pool in real time;
when any one of the real-time slag accumulation height and the operation time of the slag dragging machine meets the slag accumulation treatment starting condition, controlling the slag accumulation treatment operation to be started;
when the water level in the water tank of the slag conveyor is lower than the lowest water level of the water tank, controlling the automatic water supplementing valve to be opened, and controlling the automatic water supplementing valve to be closed until the water level in the water tank of the slag conveyor reaches the highest water level of the water tank;
when the water temperature in the water tank of the slag dragging machine is higher than the highest allowable water temperature in the water tank, controlling an automatic water supplementing valve to be opened, and supplementing water to a clean water tank; before the liquid level in the clean water tank rises to the highest liquid level in the clean water tank, if the water temperature in the water tank of the slag dragging machine falls to the highest allowable water temperature in the water tank, the automatic water supplementing valve is controlled to be closed; if the water temperature in the water tank of the slag dragging machine is still higher than the allowable maximum water temperature in the water tank when the liquid level in the clean water tank rises to the maximum liquid level in the clean water tank, the automatic water supplementing valve is controlled to be closed, and the clean water pump in the clean water pump tank is controlled to be started.
2. The indirectly cooled slag conveyor slag water self-balancing method of claim 1, further comprising:
acquiring the water temperature in the clean water tank in real time; in the running process of the clear water pump, if the water temperature in the clear water tank is higher than the allowable highest water temperature entering the slag dragging machine water tank from the clear water tank, cooling clear water in the clear water tank and then sending the clear water to the slag dragging machine water tank, otherwise, directly sending the clear water in the clear water tank back to the slag dragging machine water tank.
3. The method of self-balancing slag water of an indirectly cooled slag conveyor of claim 2, wherein the control of the clean water pump is stopped when the level of the liquid in the clean water tank is below a minimum level in the clean water tank.
4. The method of claim 3, wherein after the fresh water pump is stopped, if the water temperature in the tank of the slag extractor is still greater than the maximum allowable water temperature in the tank, the automatic water replenishment valve is controlled to be opened continuously until the water temperature in the tank of the slag extractor is less than or equal to the maximum allowable water temperature in the tank.
5. The method for self-balancing slag water of an indirectly cooled slag conveyor as in claim 2, wherein the cooling of the clear water in the clear water pond is as follows:
sending clear water in a clear water tank to cooling equipment for cooling;
and when at least two cooling devices are connected in parallel, the device with long maintenance time from the last overhaul is preferentially selected to be started.
6. The method of claim 5, wherein the start of the fresh water pump in the fresh water pump tank is controlled when the real-time water level in the fresh water tank rises to the maximum level in the fresh water tank.
7. An indirectly cooled slag conveyor slag water self-balancing system, comprising:
the accumulated slag height detection module is used for detecting the accumulated slag height in the sewage tank in real time;
the operation timing module is used for counting the operation time of the slag dragging machine in real time;
the water level detection module is used for detecting the water level in the water tank of the slag conveyor and the water level in the clean water tank in real time;
the water temperature detection module is used for detecting the water temperature in the water tank of the slag conveyor in real time;
the controller is respectively connected with the slag accumulation height detection module, the operation timing module, the water level detection module and the water temperature detection module; the controller comprises a sewage pool slag accumulation control module and a slag dragging machine water tank control module;
the sewage pool slag accumulation control module is used for controlling the slag accumulation treatment operation to be started when any one of the real-time slag accumulation height and the operation duration of the slag dragging machine meets the slag accumulation treatment starting condition;
the slag conveyor water tank control module is used for:
when the water level in the water tank of the slag conveyor is lower than the lowest water level of the water tank, controlling the automatic water supplementing valve to be opened, and controlling the automatic water supplementing valve to be closed until the water level in the water tank of the slag conveyor reaches the highest water level of the water tank;
when the water temperature in the water tank of the slag dragging machine is higher than the highest allowable water temperature in the water tank, controlling an automatic water supplementing valve to be opened, and supplementing water to a clean water tank; before the liquid level in the clean water tank rises to the highest liquid level in the clean water tank, if the water temperature in the water tank of the slag dragging machine falls to the highest allowable water temperature in the water tank, the automatic water supplementing valve is controlled to be closed; if the water temperature in the water tank of the slag dragging machine is still higher than the allowable maximum water temperature in the water tank when the liquid level in the clean water tank rises to the maximum liquid level in the clean water tank, the automatic water supplementing valve is controlled to be closed, and the clean water pump in the clean water pump tank is controlled to be started.
8. The indirectly cooled dragveyer slag water self-balancing system of claim 7, wherein the controller further comprises: the overflow water control module is used for acquiring the water temperature in the clean water tank in real time; in the running process of the clear water pump, if the water temperature in the clear water tank is higher than the allowable highest water temperature entering the slag dragging machine water tank from the clear water tank, cooling clear water in the clear water tank and then sending the clear water to the slag dragging machine water tank, otherwise, directly sending the clear water in the clear water tank back to the slag dragging machine water tank.
9. The indirectly cooled dragveyer slag water self-balancing system of claim 8, wherein the overflow water control module is further configured to: and when the liquid level in the clean water tank is lower than the lowest liquid level in the clean water tank, controlling the clean water pump to stop.
10. The indirectly cooled dragveyer slag water self-balancing system of claim 9, wherein the overflow water control module is further configured to: after the clear water pump is stopped, if the water temperature in the water tank of the slag extractor is still higher than the maximum allowable water temperature in the water tank, the automatic water supplementing valve is continuously controlled to be opened until the water temperature in the water tank of the slag extractor is lower than or equal to the maximum allowable water temperature in the water tank.
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