Indirectly cooled slag conveyer slag water self-balancing method and system

Abstract

The present application belongs to the field of control of a slag conveyor, and provides a slag water self-balancing method and system for an indirectly-cooled slag conveyor. The slag water self-balancing method for an indirectly-cooled slag conveyor comprises: when any one of a real-time accumulated slag height and a running time length of the slag conveyor meets an accumulated slag treatment opening condition, controlling an accumulated slag treatment operation to be opened; when a water level in a water tank of the slag conveyor is lower than a lowest liquid level of the water tank, controlling an automatic water replenishment valve to be opened until the water level in the water tank reaches a highest liquid level of the water tank, and then controlling the automatic water replenishment valve to be closed; when a water temperature in the water tank of the slag conveyor is greater than a highest water temperature allowed in the water tank, controlling the automatic water replenishment valve to be opened, and replenishing water to a clean water pool; before a liquid level in the clean water pool rises to the highest liquid level of the clean water pool, if the water temperature in the water tank of the slag conveyor decreases to the highest water temperature allowed in the water tank, controlling the automatic water replenishment valve to be closed; and if the water temperature in the water tank of the slag conveyor is still greater than the highest water temperature allowed in the water tank when the liquid level in the clean water pool rises to the highest liquid level of the clean water pool, controlling the automatic water replenishment valve to be closed.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of slag conveyer control, in particular to a slag water self-balancing method and system of indirect cooling slag conveyer. BACKGROUND

[0002] The statements in this section merely provide background information related to the present application and do not necessarily constitute the prior art.

[0003] The current slag conveyer cooling water and overflow water treatment technology includes the following ways:

[0004] (1) The slag conveyer cooling water self-balancing method without special treatment of overflow water, which determines the water replenishment amount by counting the slag conveyer cooling water consumption. If there is overflow water, it is overflowed to the slag water adjusting pool, cooled in the adjusting pool, and then pumped to the slag conveyer for reuse. This method lacks the ability to cope with sudden increase of slag amount. When the boiler is in the condition of blowing ash or a large amount of coking, the slag discharge amount will suddenly increase, at this time the water temperature in the slag conveyer water tank will suddenly rise, and the water level will quickly rise to the highest water level, at this time a large amount of overflow water will be produced, and the overflow water temperature is relatively high. Because the overflow water temperature is relatively high at this time, even if it is sent back to the slag conveyer, it cannot play a cooling role. In order to reduce the slag water temperature in the water tank, the high-temperature overflow water must be discharged to make room for the new overflow water in the slag water adjusting pool. Therefore, in the case of sudden increase of slag amount, this system needs to continuously discharge the waste water containing slag. In addition, the bottom of the pool will continuously accumulate slag, and when the water volume suddenly increases and the amount of accumulated slag suddenly increases, the pump suction inlet will be buried by the slag, and cannot work normally, so the accumulated slag needs to be cleaned regularly.

[0005] (2) Indirect heat exchanger is added to the slag conveyer body, which cools the slag water through cooling water, and the cooling water does not directly contact with the slag water. The heat exchanger is installed in the water tank. This method also lacks the ability to cope with sudden increase of slag amount. This method does not have an overflow water treatment system, and it is considered that there is no overflow water, but in fact when the amount of slag suddenly increases, the water temperature in the slag conveyer water tank will rise, and the water level will also rise, which is easy to cause the overflow water to directly overflow out of the slag conveyer and flow to the ground. The heat exchanger in this technology is always immersed in the slag water, which is easy to cause wear and corrosion, and the service life of the heat exchanger is not good, and it needs to be replaced frequently. If the Ca content in the coal ash is relatively high, it will cause the structure of the outer wall of the heat exchanger and the heat exchange efficiency to decrease, which is difficult to clean. Because the heat exchanger is immersed in the slag water and located below the boiler slag falling port, for the safety of personnel, the hydraulic door of the slag falling port must be closed to block the falling of high-temperature furnace slag, and the heat exchanger can only be cleaned in this state, which generally cannot exceed 4 hours, and the operation time is seriously insufficient.

[0006] (3) The slag water external direct cooling system introduces overflow water to the cooler, the cooler is provided with a flow guide plate and a perforated plate, the overflow water is cooled by cooling air, and the cooled overflow water is pumped back to the slag extractor. No ditch and slag water pool are arranged. The technical scheme has the following defects: the cooling air is directly discharged to the boiler room after absorbing heat, which causes the temperature of the boiler room to rise and the environment of the personnel to deteriorate. The overflow water contains slag particles, especially when a large amount of slag falls, the falling slag stirs the slag water, the amount of slag in the water increases sharply, the perforated plate is easily blocked, the water flow of the cooler is not smooth, and the maintenance workload is increased. The system reliability is insufficient, and when the perforated plate of the cooler is blocked or the pump fails, there is no backup overflow water treatment measure.

[0007] (4) The slag water external indirect cooling system, wherein the overflow water overflows to the sewage pool, the clean water is introduced to the clean water pool after sedimentation, the water in the clean water pool is pumped to the cooler, the cooler is an indirect cooler, the cooling water does not directly contact with the slag water, and the cooled overflow water is sent back to the slag extractor through a jet assembly. Meanwhile, a dust suction assembly is additionally arranged on the jet assembly to suck dust. The technical scheme has the following defects: the cooler needs to be always put into operation, the frequency of scaling and blocking of the cooler is increased, and the maintenance workload is increased. The overflow water is overflowed from the sewage pool to the clean water pool in a natural overflow manner, the natural overflow effect is not good when a large amount of slag is discharged from the boiler, the water in the clean water pool also contains slag, and the cooler is easily blocked. The slag at the bottom of the sewage pool needs to be manually cleaned regularly. The slag extractor is a wet slag removal system, the slag needs to be soaked in water and then extracted, so there is no dust problem in the engineering boiler room using the slag extractor, and the dust suction assembly is not necessary.

[0008] In summary, the existing slag water treatment technology of the slag extractor has the following defects: the response capability to the condition of suddenly discharging a large amount of slag is insufficient, the cooling system is frequently put into operation, the cooler is easily blocked when a large amount of slag is discharged from the boiler, the cooling system is reduced, and the operation stability of the indirect cooling slag extractor is poor. SUMMARY

[0009] In order to solve the technical problems in the background art, the present application provides a slag water self-balancing method and system of an indirect cooling slag extractor, which can improve the response capability to the condition of suddenly discharging a large amount of slag, reduce the number of times of putting the cooling system into operation, prolong the service life of the cooling system, and improve the system reliability and stability.

[0010] In order to achieve the above-mentioned purpose, the present application adopts the following technical scheme:

[0011] The first aspect of the present application provides a slag water self-balancing method of an indirect cooling slag extractor.

[0012] The slag water self-balancing method of the indirect cooling slag extractor comprises the following steps:

[0013] Real-time acquisition of the height of the accumulated slag in the sewage pool, the running time of the slag extractor, the water level and water temperature in the water tank of the slag extractor, and the water level in the clean water pool;

[0014] When either of the real-time accumulated slag height and the running time of the slag extractor meets the accumulated slag treatment opening condition, the accumulated slag treatment operation is controlled to be opened.

[0015] When the water level in the water tank of the slag extractor is lower than the lowest liquid level of the water tank, the automatic water supplement valve is controlled to be opened until the water level in the water tank of the slag extractor reaches the highest liquid level of the water tank, and then the automatic water supplement valve is controlled to be closed.

[0016] When the water temperature in the water tank of the slag extractor is greater than the highest allowable water temperature in the water tank, the automatic water supplement valve is controlled to be opened to supplement water to the clean water pool. Before the liquid level in the clean water pool rises to the highest liquid level of the clean water pool, if the water temperature in the water tank of the slag extractor decreases to the highest allowable water temperature in the water tank, the automatic water supplement valve is controlled to be closed. If the water temperature in the water tank of the slag extractor is still greater than the highest allowable water temperature in the water tank when the liquid level in the clean water pool rises to the highest liquid level of the clean water pool, the automatic water supplement valve is controlled to be closed and the clean water pump in the clean water pool is controlled to be started.

[0017] The accumulated slag treatment opening condition is that:

[0018] The accumulated slag height is greater than the highest accumulated slag value.

[0019] Or the running time of the slag extractor is greater than the maintenance cycle limit.

[0020] As an implementation form, the slag water self-balancing method of the indirect cooling slag extractor further comprises:

[0021] Real-time acquisition of the water temperature in the clean water pool. During the operation of the clean water pump, if the water temperature in the clean water pool is greater than the highest allowable water temperature from the clean water pool into the water tank of the slag extractor, the clean water in the clean water pool is sent to the water tank of the slag extractor after being cooled, otherwise, the clean water in the clean water pool is directly sent back to the water tank of the slag extractor.

[0022] The above technical solution has the advantage that the water temperature in the clean water pool is automatically monitored to reduce the number of times of putting the cooling system into operation and prolong the service life of the cooling system.

[0023] As an implementation form, when the liquid level in the clean water pool is lower than the lowest liquid level of the clean water pool, the clean water pump is controlled to be stopped.

[0024] As an implementation form, after the clean water pump is stopped, if the water temperature in the water tank of the slag extractor is still greater than the highest allowable water temperature in the water tank, the automatic water supplement valve is continuously controlled to be opened until the water temperature in the water tank of the slag extractor is less than or equal to the highest allowable water temperature in the water tank.

[0025] The above technical solution has the advantage that the automatic water supplement valve is used to control the water temperature in the water tank of the slag extractor to balance the water level and the water temperature.

[0026] As an implementation, the process of cooling the clean water in the clean water pool is:

[0027] The clean water in the clean water pool is sent to the cooling device for cooling;

[0028] And when at least two cooling devices are connected in parallel, the device with the longest time since the last maintenance is preferentially started.

[0029] The above technical solution has the advantage of improving the stability of the entire system by preferentially starting the device with the longest time since the last maintenance.

[0030] As an implementation, when the real-time water level in the clean water pool rises to the highest liquid level of the clean water pool, the clean water pump in the clean water pool is started.

[0031] The second aspect of the present application provides an indirect cooling slag water self-balancing system of a slag conveyor.

[0032] An indirect cooling slag water self-balancing system of a slag conveyor, comprising:

[0033] A slag accumulation height detection module for real-time detection of the slag accumulation height in the sewage pool;

[0034] A running timing module for real-time counting of the running time of the slag conveyor;

[0035] A water level detection module for real-time detection of the water level in the water tank of the slag conveyor and the water level in the clean water pool;

[0036] A water temperature detection module for real-time detection of the water temperature in the water tank of the slag conveyor;

[0037] A controller connected to the slag accumulation height detection module, the running 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 conveyor water tank control module;

[0038] The sewage pool slag accumulation control module is used to control the slag accumulation treatment operation to start when any of the real-time slag accumulation height and the running time of the slag conveyor meets the slag accumulation treatment starting condition;

[0039] The slag conveyor water tank control module is used to:

[0040] When the water level in the water tank of the slag conveyor is lower than the lowest liquid level of the water tank, the automatic water replenishment valve is controlled to open until the water level in the water tank of the slag conveyor reaches the highest liquid level of the water tank, and the automatic water replenishment valve is controlled to close;

[0041] When the water temperature in the water tank of the slag conveyor is greater than the maximum allowable water temperature in the water tank, the automatic water replenishing valve is controlled to open, and water is replenished to the clean water pool; before the liquid level in the clean water pool rises to the maximum liquid level of the clean water pool, if the water temperature in the water tank of the slag conveyor decreases to the maximum allowable water temperature in the water tank, the automatic water replenishing valve is controlled to close; if the water temperature in the water tank of the slag conveyor is still greater than the maximum allowable water temperature in the water tank when the liquid level in the clean water pool rises to the maximum liquid level of the clean water pool, the automatic water replenishing valve is controlled to close and the clean water pump in the clean water pool is controlled to start.

[0042] As an implementation form, the controller further comprises an overflow water control module, which is configured to acquire the water temperature in the clean water pool in real time; during the operation of the clean water pump, if the water temperature in the clean water pool is greater than the maximum allowable water temperature from the clean water pool into the water tank of the slag conveyor, the clean water in the clean water pool is sent to the water tank of the slag conveyor after being cooled, otherwise, the clean water in the clean water pool is directly sent back to the water tank of the slag conveyor.

[0043] As an implementation form, the overflow water control module is further configured to control the clean water pump to stop when the liquid level in the clean water pool is lower than the minimum liquid level of the clean water pool.

[0044] As an implementation form, the overflow water control module is further configured to, after the clean water pump stops, if the water temperature in the water tank of the slag conveyor is still greater than the maximum allowable water temperature in the water tank, continue to control the automatic water replenishing valve to open until the water temperature in the water tank of the slag conveyor is less than or equal to the maximum allowable water temperature in the water tank.

[0045] Compared with the prior art, the present application has the following beneficial effects:

[0046] (1) The present application detects the accumulated slag height and the running time of the slag conveyor in real time, and judges whether any of them meets the accumulated slag treatment opening condition, if yes, controls the accumulated slag treatment operation to open, when the boiler suddenly discharges a large amount of slag, automatically determines that the slag water cooling system is put into operation, ensures that there is no slag-containing wastewater discharge, and improves the response capability of the boiler under the condition of sudden large amount of slag discharge.

[0047] (2) The present application automatically controls the overflow water in the clean water pool, the liquid level and the water temperature in the water tank of the slag conveyor, and the whole slag removal system is automatically determined without human operation, which improves the automation level of the whole slag removal system.

[0048] The advantages of the additional aspects of the present application will be partially given in the following description, partially will become obvious from the following description, or will be understood by the practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0049] The drawings constituting a part of the specification of the present application are used to provide further understanding of the present application, the illustrative embodiments of the present application and the description thereof serve to explain the present application, and do not constitute improper limitation on the present application.

[0050] Figure 1 is a structure diagram of a slag water self-balancing system of an indirect cooling slag conveyer of an embodiment of the present application;

[0051] Figure 2 is a control flow chart of a method of slag water self-balancing of an indirect cooling slag conveyer of an embodiment of the present application. DETAILED DESCRIPTION

[0052] The present application will be further described below in conjunction with the accompanying drawings and embodiments.

[0053] It should be noted that the following detailed description is illustrative only and is intended to provide further description of the present application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0054] It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, elements, components, and / or groups thereof, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof.

[0055] Terminology:

[0056] Slag conveyer: also known as water immersion type scraper type slag conveyer, refers to the mechanical equipment that relies on a certain water depth of water tank to immerse and cool high temperature slag, and uses closed circulating scraper chain to remove part of the water in the mixture of wet slag stone and water, which is simply referred to as slag conveyer.

[0057] Slag water: also known as cold slag water, slag-containing water, including water in the water tank of the slag conveyer and overflow water.

[0058] Overflow water: water overflowed outside the water tank of the slag conveyer when the water level of the slag conveyer rises to the highest point.

[0059] Embodiment one

[0060] Set the highest liquid level Lmax of the water tank, the lowest liquid level Lmin of the water tank, and the highest water temperature T2 allowed in the water tank; set the highest liquid level Hmax of the clean water tank, the lowest liquid level Hmin of the clean water tank, and the highest water temperature T1 allowed from the clean water tank into the water tank of the slag conveyer; set the highest value Nmax and the lowest value Nmin of the underwater accumulated slag in the sewage tank; inject water into the water tank of the slag conveyer, and the water level is located between the highest liquid level Lmax and the lowest liquid level Lmin of the water tank.

[0061] In combination with Figure 1 and Figure 2The embodiment provides a slag water self-balancing method of an indirectly cooled slag conveyor, which comprises the following steps:

[0062] Step 1: Real-time acquisition of the accumulated slag height in a sewage pool, the running time length of the slag conveyor, the water level and water temperature in the water tank of the slag conveyor and the water level in the clean water pool.

[0063] In the specific implementation process, a liquid level measuring device is arranged in the water tank of the slag conveyor to monitor the water tank liquid level L;

[0064] A temperature measuring device is arranged in the water tank of the slag conveyor to monitor the water temperature Tx in the water tank.

[0065] A liquid level measuring device is arranged in the clean water pool to monitor the clean water pool liquid level H.

[0066] A temperature measuring device is arranged in the clean water pool to monitor the water temperature Tc in the clean water pool.

[0067] A low material level Nmin is arranged in the sewage pool.

[0068] An interface instrument is arranged on the sewage pool to monitor the underwater accumulated slag height N in the pool, when the accumulated slag is about to be full, the agitator and the slag discharge pump are started in sequence through the operation control box to send the accumulated slag to the slag bin, and the operation is automatically stopped when the material level is reduced to Nmin.

[0069] Step 2:

[0070] When any one of the real-time accumulated slag height and the running time length of the slag conveyor meets the accumulated slag treatment opening condition, the accumulated slag treatment operation is controlled to be opened.

[0071] The accumulated slag treatment opening condition is that:

[0072] The accumulated slag height is greater than the highest accumulated slag value;

[0073] Or the running time length of the slag conveyor is greater than the maintenance cycle limit.

[0074] When the water level in the water tank of the slag conveyor is lower than the lowest liquid level of the water tank, the automatic water replenishing valve is controlled to be opened until the water level in the water tank of the slag conveyor reaches the highest liquid level of the water tank, and then the automatic water replenishing valve is controlled to be closed.

[0075] When the water temperature in the water tank of the slag conveyor is greater than the highest allowable water temperature in the water tank, the automatic water replenishing valve is controlled to be opened to replenish water to the clean water pool; if the water temperature in the water tank of the slag conveyor is reduced to the highest allowable water temperature in the water tank before the liquid level in the clean water pool rises to the highest liquid level of the clean water pool, the automatic water replenishing valve is controlled to be closed; if the water temperature in the water tank of the slag conveyor is still greater than the highest allowable water temperature in the water tank when the liquid level in the clean water pool rises to the highest liquid level of the clean water pool, the automatic water replenishing valve is controlled to be closed and the clean water pump in the clean water pool is controlled to be started.

[0076] When the boiler is normally discharged, the water temperature Tx in the water tank can be maintained not more than the maximum water temperature T2 allowed in the water tank; when the water level L is lowered to the minimum water level Lmin in the water tank, the automatic water replenishment valve is opened, and when the water level L in the water tank is raised to the maximum water level Lmax, the automatic water replenishment valve is closed, which can play a role in periodically updating the stored water in the water tank.

[0077] When the boiler discharge amount is slightly increased, the water level L in the water tank of the slag conveyer is raised, and the water temperature Tc in the clean water tank is raised, and the evaporation amount is increased. Once the water temperature exceeds the maximum water temperature T2 allowed in the water tank, or the water level in the water tank is lowered to the minimum water level Lmin in the water tank, the automatic water replenishment valve is opened. At this time, if the overflow water overflows, due to the small increase in the discharge amount, the amount of overflow water is also small, and the overflow water has sufficient time to naturally cool in the sewage tank and the clean water tank, and the water temperature will not exceed the maximum water temperature T1 allowed from the clean water tank into the water tank of the slag conveyer. When the water level in the clean water tank is raised to the maximum water level Hmax in the clean water tank, the clean water is directly sent back to the water tank of the slag conveyer through the clean water pump, which is equivalent to increasing the supply of cold slag water, which is beneficial to quickly reduce Tx to below the maximum water temperature T2 allowed in the water tank. When the water temperature Tx in the water tank is less than the maximum water temperature T2 allowed in the water tank, and the water level L in the water tank of the slag conveyer is equal to the maximum water level Lmax in the water tank, the automatic water replenishment valve is closed.

[0078] In the specific implementation process, the indirect cooling slag water self-balancing method of the slag conveyer further comprises:

[0079] The water temperature in the clean water tank is obtained in real time; during the operation of the clean water pump, if the water temperature in the clean water tank is greater than the maximum water temperature allowed from the clean water tank into the water tank of the slag conveyer, the clean water in the clean water tank is sent to the water tank of the slag conveyer after cooling, otherwise, the clean water in the clean water tank is directly sent back to the water tank of the slag conveyer.

[0080] The process of cooling the clean water in the clean water tank is:

[0081] The clean water in the clean water tank is sent to the cooling equipment for cooling;

[0082] When at least two cooling equipment are connected in parallel, the equipment with a long time since the last maintenance is preferentially selected to be started. In this way, by preferentially selecting the equipment with a long time since the last maintenance to be started, the stability of the entire system is improved.

[0083] For example, when the amount of boiler slag increases greatly, the water level L in the water tank of the slag conveyor rises, and the water temperature Tc in the clean water tank rises rapidly to above the maximum water temperature T2 allowed in the water tank, and the automatic water replenishment valve opens. At this time, there is overflow water overflow, and because the amount of slag increases greatly, the amount of overflow water is large and the water temperature is high. The overflow water does not have enough time to cool naturally in the sewage tank and the clean water tank, and the water temperature will exceed the maximum water temperature T1 allowed from the clean water tank into the water tank of the slag conveyor. At this time, the water level in the clean water tank rises to the maximum liquid level Hmax of the clean water tank, and is sent to the electric water filter to remove slag particles, and then enters the tube-shell heat exchanger; the tube-shell heat exchanger cooling water passage valve is opened to provide cooling water, and the cooling water exchanges heat with the high-temperature overflow water to reduce the temperature of the high-temperature overflow water to below the maximum water temperature T1 allowed from the clean water tank into the water tank of the slag conveyor, and then the low-temperature overflow water enters the water tank of the slag conveyor. When the water temperature Tc in the clean water tank is less than the maximum water temperature T1 allowed from the clean water tank into the water tank of the slag conveyor, the overflow water no longer enters the water filter and the heat exchanger, but directly enters the water tank of the slag conveyor. When the water temperature Tx in the water tank is less than the maximum water temperature T2 allowed in the water tank, the automatic water replenishment valve is closed.

[0084] The above technical solution reduces the number of times of putting the cooling system into operation by automatically monitoring the water temperature in the clean water tank, and prolongs the service life of the cooling system.

[0085] When the liquid level in the clean water tank is lower than the minimum liquid level of the clean water tank, the clean water pump is controlled to stop. After the clean water pump stops, if the water temperature in the water tank of the slag conveyor is still greater than the maximum water temperature allowed in the water tank, the automatic water replenishment valve is continuously controlled to open until the water temperature in the water tank of the slag conveyor is less than or equal to the maximum water temperature allowed in the water tank. When the real-time water level in the clean water tank rises to the maximum liquid level of the clean water tank, the clean water pump in the clean water tank is controlled to start. In this way, the automatic water replenishment valve controls the water temperature in the water tank of the slag conveyor on the one hand, and balances the water level and the water temperature.

[0086] In some specific implementations, when there is a large amount of accumulated slag in the sewage tank, the accumulated slag height N≥the maximum accumulated slag height Nmax, the electric agitator and the slag pump are opened in turn to send the accumulated slag to the slag bin; until the accumulated slag height N=the minimum accumulated slag height Nmin, the electric agitator and the slag pump stop running.

[0087] Embodiment Two

[0088] In combination Figure 1 and Figure 2 , the embodiment provides a slag water self-balancing system of a slag conveyor with indirect cooling, which comprises an accumulated slag height detection module, a running timing module, a water level detection module, a water temperature detection module and a controller.

[0089] The accumulated slag height detection module is used for detecting the accumulated slag height in the sewage tank in real time;

[0090] a running time counting module for counting the running time of the slag conveyor in real time;

[0091] a water level detecting module for detecting the water level in the water tank of the slag conveyor and the water level in the clean water pool in real time;

[0092] a water temperature detecting module for detecting the water temperature in the water tank of the slag conveyor in real time.

[0093] It should be noted that the accumulated slag height detecting module, the running time counting module, the water level detecting module and the water temperature detecting module can be realized by using existing sensing elements or devices, and the specific type thereof can be selected by the person skilled in the art according to the actual precision requirement, which will not be described in detail here.

[0094] In the embodiment, a controller is connected to the accumulated slag height detecting module, the running time counting module, the water level detecting module and the water temperature detecting module respectively; the controller comprises a sewage pool accumulated slag control module and a slag conveyor water tank control module.

[0095] Specifically, the sewage pool accumulated slag control module is configured to control the accumulated slag treatment operation to be started when any one of the real-time accumulated slag height and the running time of the slag conveyor meets the accumulated slag treatment starting condition.

[0096] The accumulated slag treatment starting condition is that:

[0097] the accumulated slag height is greater than the maximum accumulated slag height;

[0098] or the running time of the slag conveyor is greater than the maintenance cycle limit.

[0099] For example, when there is a large amount of accumulated slag in the sewage pool, the accumulated slag height N is greater than the maximum accumulated slag height Nmax, the electric mixer and the slag discharge pump are started in sequence to send the accumulated slag to the slag bin until the material level is reduced to Nmin, and then the electric mixer and the slag discharge pump are stopped.

[0100] The slag conveyor water tank control module is configured to:

[0101] when the water level in the slag conveyor water tank is lower than the minimum water level of the water tank, the automatic water replenishing valve is controlled to be opened until the water level in the slag conveyor water tank reaches the maximum water level of the water tank, and then the automatic water replenishing valve is controlled to be closed;

[0102] when the water temperature in the slag conveyor water tank is greater than the maximum allowable water temperature in the water tank, the automatic water replenishing valve is controlled to be opened to replenish water to the clean water pool; before the water level in the clean water pool rises to the maximum water level of the clean water pool, if the water temperature in the slag conveyor water tank decreases to the maximum allowable water temperature in the water tank, the automatic water replenishing valve is controlled to be closed; if the water temperature in the slag conveyor water tank is still greater than the maximum allowable water temperature in the water tank when the water level in the clean water pool rises to the maximum water level of the clean water pool, the automatic water replenishing valve is controlled to be closed and the clean water pump in the clean water pool is controlled to be started.

[0103] In the control module of the water tank of the slag conveyor, when the water level L of the water tank of the slag conveyor is lower than the minimum water level Lmin of the water tank, the automatic water replenishing valve is opened until the water level rises to the maximum water level Lmax of the water tank, and the automatic water replenishing valve is closed; when the water temperature Tx in the water tank of the slag conveyor is higher than the maximum allowable water temperature T2 in the water tank, the automatic water replenishing valve is opened. When the water level H of the clean water pool rises to the maximum water level Hmax of the clean water pool, if the water temperature Tx in the water tank of the slag conveyor is lower than the maximum allowable water temperature T2 in the water tank, the automatic water replenishing valve is closed; if the water level H of the clean water pool rises to the maximum water level Hmax of the clean water pool, and the water temperature Tx in the water tank is still greater than the maximum allowable water temperature T2 in the water tank, the automatic water replenishing valve is closed, and the overflow water control module is put into work.

[0104] In some embodiments, the controller further comprises an overflow water control module for acquiring the water temperature in the clean water pool in real time; during the operation of the clean water pump, if the water temperature in the clean water pool is greater than the maximum allowable water temperature of the water from the clean water pool into the water tank of the slag conveyor, the clean water in the clean water pool is sent to the water tank of the slag conveyor after being cooled, otherwise, the clean water in the clean water pool is directly sent back to the water tank of the slag conveyor.

[0105] In some embodiments, the overflow water control module is further configured to control the clean water pump to stop when the water level in the clean water pool is lower than the minimum water level of the clean water pool.

[0106] The overflow water control module is further configured to, after the clean water pump stops, continue to control the automatic water replenishing valve to open if the water temperature in the water tank of the slag conveyor is still greater than the maximum allowable water temperature in the water tank, until the water temperature in the water tank of the slag conveyor is less than or equal to the maximum allowable water temperature in the water tank.

[0107] For example:

[0108] In the overflow water control module, when the water level H of the clean water pool rises to the maximum water level Hmax of the clean water pool, the clean water pump in the clean water pump pool is started. At this time, the water temperature Tc of the clean water pool is determined.

[0109] If Tc is less than or equal to the maximum allowable water temperature T1 of the water from the clean water pool into the water tank of the slag conveyor, the clean water in the clean water pool is sent back to the water tank of the slag conveyor through valve switching - this is the default state.

[0110] If Tc is greater than the maximum allowable water temperature T1 of the water from the clean water pool into the water tank of the slag conveyor, the clean water in the clean water pool is sent to the electric water filter - the shell-and-tube heat exchanger through valve switching, and the cooling water inlet valve is opened to supply cooling water to the heat exchanger. Which of the electric water filter and the shell-and-tube heat exchanger is actually put into use is determined by the system according to the equipment maintenance record, and the equipment that has been away from the last maintenance for the longest time is preferentially selected. In this way, the water in the clean water pool enters the water tank of the slag conveyor after being cooled.

[0111] Until the liquid level H in the clean water tank is lower than the minimum liquid level Hmin in the clean water tank, the clean water pump stops and the cooling water supply valve is closed. At this time, if the water temperature Tx in the slag conveyer water tank is less than or equal to the maximum water temperature T2 allowed in the water tank, the module stops operating and the related valves are switched to the default state; if the water temperature Tx in the slag conveyer water tank is still greater than the maximum water temperature T2 allowed in the water tank, the water level L and the water temperature Tx in the slag conveyer water tank are continuously monitored, the slag conveyer water tank control module is started, and the water temperature Tx in the slag conveyer water tank is less than or equal to the maximum water temperature T2 allowed in the water tank.

[0112] The technical solution of the embodiment has the following advantages:

[0113] (1) The embodiment improves the ability to cope with sudden large amount of slag discharge of the boiler, and can ensure that no slag-containing wastewater is discharged even if the boiler suddenly discharges a large amount of slag for a long time. When the boiler normally discharges slag or the amount of slag discharge slightly increases, the slag and water self-balancing is realized through the above-mentioned automatic control; when the boiler suddenly discharges a large amount of slag for a long time, a large amount of slag-containing wastewater will be inevitably discharged, and the slag and water indirect cooling system is provided in the technical solution, which can realize automatic operation of the slag and water indirect cooling system, cool the slag and water, and then send the slag and water back to the slag conveyer for reuse, so that no slag-containing wastewater is discharged at all times.

[0114] (2) The embodiment realizes automatic judgment of whether the cooling system is put into operation and prolongs the service life of the cooling system. The slag and water cooling system is put into operation only when the slag and water in the slag conveyer and the clean water tank are both full and the slag and water temperature in the slag conveyer is still higher than the allowable value at this time, and the slag and water cooling system is automatically stopped when the slag and water temperature in the slag conveyer is lower than the allowable value. In this way, the number and time of operation of the slag and water cooling system are minimized under the premise of ensuring the safe and stable operation of the system, which is beneficial to prolonging the service life of the cooling system.

[0115] (3) The embodiment improves the reliability and stability of the system. As shown in Figure 1 , a special electric slag filter is arranged in front of the slag and water cooler, which can effectively prevent the cooler from being blocked when the boiler discharges a large amount of slag, improve the cooling effect, and ensure that no slag-containing wastewater is discharged during the operation of the system. At the same time, as shown in Figure 1 , and when the electric water filter and the tubular heat exchanger are respectively provided with parallel standby devices, the device with a longer time since the last maintenance is selected to be put into operation according to the system, which can effectively ensure the stability of the system.

[0116] (4) The embodiment improves the automation level of the entire slag removal system. The water replenishment of the entire slag removal system and the operation of the slag and water cooling system can be automatically performed according to the control logic of the above-mentioned technical solution.

[0117] (5) The slag conveyor water tank control module and the overflow water control module of the embodiment are associated by judging whether the water temperature Tx of the slag conveyor water tank exceeds the allowable value of the maximum water temperature T2 in the water tank, i.e. when the water in the pool is emptied and the water in the slag conveyor water tank is still over-temperature, the slag conveyor automatic water supply valve is started again to supply new cold slag water to the entire system for a new cycle of judgment. In this way, the automatic control module of the entire system can be constructed as a stable whole, and all judgments are automatically performed, which can further ensure the stable and safe operation of the slag conveyor.

[0118] (6) The embodiment reduces the workload of the on-site operators. The entire slag removal system is automatically operated, and the operation process does not require additional manual participation. When there is a large amount of accumulated slag at the bottom of the sewage pool, it is automatically identified and directly sent to the slag warehouse for loading and external transportation by electric equipment, without manual cleaning.

[0119] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A self-balancing method for slag and water in an indirect-cooling slag remover, characterized in that, include: The system can acquire real-time data on the height of sludge in the sewage tank, the running time of the sludge removal machine, the water level and temperature in the sludge removal machine's water tank, and the water level in the clear water tank. When either the real-time slag height or the running time of the slag remover meets the conditions for starting the slag treatment, the slag treatment operation is started. When the water level in the slag remover's water tank is lower than the minimum level, the automatic water supply valve is opened until the water level in the slag remover's water tank reaches the maximum level, at which point the automatic water supply valve is closed. When the water temperature in the slag remover's water tank exceeds the maximum allowable water temperature, the automatic water supply valve opens to replenish water to the clear water tank. If the water temperature in the slag remover's water tank drops to the maximum allowable water temperature before the water level in the clear water tank reaches its maximum level, the automatic water supply valve closes. If the water temperature in the slag remover's water tank is still higher than the maximum allowable water temperature when the water level in the clear water tank reaches its maximum level, the automatic water supply valve closes and the clear water pump in the clear water pump tank starts. The indirect cooling slag remover self-balancing method further includes: Real-time monitoring of water temperature in the clear water tank; During the operation of the clean water pump, if the water temperature in the clean water tank is higher than the maximum allowable water temperature for entering the slag remover water tank from the clean water tank, the clean water in the clean water tank will be cooled and then sent to the slag remover water tank; otherwise, the clean water in the clean water tank will be sent directly back to the slag remover water tank. The cooling process of the clear water in the clear water tank is as follows: The clean water in the clear water tank is sent to the cooling equipment for cooling; Furthermore, when at least two cooling devices are connected in parallel, the device that has been in operation for the longest time since the last maintenance should be selected first.

2. The indirect cooling slag remover self-balancing method as described in claim 1, characterized in that, When the liquid level in the clear water tank is lower than the minimum liquid level in the clear water tank, the clear water pump will be stopped.

3. The indirect cooling slag remover self-balancing method as described in claim 2, characterized in that, After the clean water pump stops, if the water temperature in the slag remover's water tank is still higher than the maximum allowable water temperature in the tank, the automatic water supply valve will continue to be opened until the water temperature in the slag remover's water tank is lower than or equal to the maximum allowable water temperature in the tank.

4. The indirect cooling slag remover self-balancing method as described in claim 1, characterized in that, When the real-time water level in the clear water tank rises to the highest level in the clear water tank, the clear water pump in the clear water pump pool is started.

5. A self-balancing system for slag and water in an indirect-cooled slag remover, achieving the self-balancing method for slag and water in an indirect-cooled slag remover as described in any one of claims 1-4, characterized in that, include: The sludge height detection module is used to detect the sludge height in the sewage tank in real time. The timing module is used to count the running time of the slag remover in real time; The water level detection module is used to detect the water level in the slag remover's water tank and the clear water tank in real time. The water temperature detection module is used to detect the water temperature in the slag remover's water tank in real time. The controller is connected to the sludge height detection module, the running timer module, the water level detection module, and the water temperature detection module, respectively; the controller includes a sewage tank sludge control module and a sludge removal machine water tank control module. The wastewater tank sludge control module is used to control the sludge treatment operation to start when either the real-time sludge height or the running time of the sludge removal machine meets the sludge treatment start condition. The slag remover water tank control module is used for: When the water level in the slag remover's water tank is lower than the minimum level, the automatic water supply valve is opened until the water level in the slag remover's water tank reaches the maximum level, at which point the automatic water supply valve is closed. When the water temperature in the slag remover's water tank exceeds the maximum allowable water temperature, the automatic water supply valve opens to replenish water to the clear water tank. If the water temperature in the slag remover's water tank drops to the maximum allowable water temperature before the water level in the clear water tank reaches its maximum level, the automatic water supply valve closes. If the water temperature in the slag remover's water tank is still above the maximum allowable water temperature when the water level in the clear water tank reaches its maximum level, the automatic water supply valve closes and the clear water pump in the clear water pump tank starts.

6. The indirect cooling slag remover self-balancing system as described in claim 5, characterized in that, The controller further includes an overflow water control module, which is used to acquire the water temperature in the clear water tank in real time. During the operation of the clear water pump, if the water temperature in the clear water tank is greater than the maximum allowable water temperature for entering the slag remover water tank from the clear water tank, the clear water in the clear water tank is cooled and then sent to the slag remover water tank; otherwise, the clear water in the clear water tank is directly sent back to the slag remover water tank.

7. The indirect cooling slag remover self-balancing system as described in claim 6, characterized in that, The overflow water control module is also used to: control the clear water pump to stop when the liquid level in the clear water tank is lower than the minimum liquid level in the clear water tank.

8. The indirect cooling slag remover self-balancing system as described in claim 7, characterized in that, The overflow water control module is also used to: after the clean water pump stops, if the water temperature in the slag remover's water tank is still higher than the maximum allowable water temperature in the water tank, continue to control the automatic water replenishment valve to open until the water temperature in the slag remover's water tank is lower than or equal to the maximum allowable water temperature in the water tank.

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