JP5408646B2 - Hammering operation schedule control system for waste heat boiler - Google Patents

Description

  The present invention relates to a waste heat boiler having a hammering device that removes dust adhering and accumulating on a heat transfer tube, and more specifically, the dust adhering and accumulating on the heat transfer tube of the waste heat boiler is environmentally friendly and effective. The present invention relates to a control system for a hammering operation schedule that can be eliminated.

A waste heat boiler provided with a hammering device (dust removal device) is, for example, as a waste heat boiler for a cement plant as described in Japanese Patent Publication No. 59-28813 (a dust adhesion prevention device for a waste heat boiler). It is already known.
In the known waste heat boiler, a large amount of dust is contained in the exhaust gas flowing into the waste heat boiler, and adhesion of this dust to the heat transfer tube becomes fouling resistance, and the boiler performance is remarkably lowered. The dust content in the exhaust gas is 100 to 130 gr / Nm ³ and the dust particle size is 5 μm or less occupies 95%, and since the microstructure of the dust is fibrous, it has an adhesive property to the heat transfer tube. Since it is strong and has a low thermal conductivity, even if there is a slight thickness (several millimeters) of adhesion / deposition, a large stain resistance is obtained.

  The waste heat boiler 40 described in the above Japanese Patent Publication No. 59-28813 (Patent Document 1) has an abutting plate at the lower end of the bend portion of the suspended serpentine type heat transfer tube 41 as shown in FIGS. A pipe row pitch setting metal fitting 47 is suspended via 46, and the setting metal fitting 47 is inserted and fixed between the projecting pieces 48 fixed to the connecting shaft 42. A fixed shaft 51 and a stopper plate 52 are provided in order to prevent disturbance of the pipe row pitch in the gas flow direction of the suspended heat transfer tube 41.

In the waste heat boiler 40, the collision energy of the hammer (rotating hammer hammer) 45 is transmitted to the connecting shaft 42 via the intermediate shaft 43 in order to remove dust adhering to the suspended serpentine heat transfer tube 41. Then (see FIG. 16B), the connecting shaft 42 transmits impact energy to the lower end of the bend portion of the heat transfer tube 41 via the projecting piece 48, the pipe row pitch setting fitting 47, and the abutting plate 46. The heat transfer tube 41 is vibrated. As a result, the dust adhering to the heat transfer tube 41 is peeled off, falls naturally onto the hopper 53 and is discharged by the conveyor 55.
In this way, in waste heat boilers, fine dust in the exhaust gas that flows in adheres to and accumulates on the surface of the heat transfer tube, hinders heat transfer, increases dirt resistance due to dust, and significantly reduces boiler performance. By providing the device, dust adhering to the heat transfer tube is removed.

Furthermore, the heat transfer area of the waste heat boiler is expected to be resistant to dirt due to the adhesion of dust as described above. For example, the heat transfer surface has a heat transfer surface several times that of a clean state. Since the margin of the heat transfer surface is set to be large compared to the above, the ratio of the cost to the entire waste heat boiler equipment is not small.
As described above, even if the waste heat boiler has a large heat transfer area, dust adheres to the heat transfer surface and the dirt resistance does not increase beyond a predetermined level (reducing the boiler's performance). It is necessary to operate the hammering device to maintain the predetermined performance.

Japanese Patent Publication No.59-28813

However, in the hammering apparatus installed in the conventional waste heat boiler, there are various limitations in the operation procedure for improving the dirt resistance due to the structure.
For example, since a number of hammering hammers are set on a single rotating shaft, a uniform impact is applied to each heat transfer surface, so even if it is actually not so dirty, it is more than necessary. There are places where the striking force is applied, while there are places where the necessary striking force is not applied even in a considerably dirty state. Such imbalance of the impact force has had an adverse effect on the life of the entire equipment, in particular, the durability of the hammering device.

And since the durability of the hammering device is greatly affected by the number of hits and the hitting force, applying uniform hitting to each heat transfer surface not only shortens the average life of the hammering device. In addition, a soundproof cover for noise countermeasures is required, and a large noise (about 110 dB) at the time of hitting may cause a great inconvenience to neighboring private houses.
Moreover, if the hammer part of a hammering apparatus is damaged, the striking force applied to a heat exchanger tube will become weak, and boiler performance will fall. When the boiler performance is remarkably deteriorated, the number of hits per unit time may be increased. However, the effect cannot be expected so much and the damage to the hammering device is increased.

Here, various factors that increase the dirt resistance of the heat transfer surface due to the dust adhered to and accumulated on the heat transfer tubes will be described with reference to FIGS. 4 to 8 are diagrams schematically showing the relationship between each factor and the dirt resistance.
(1) Relationship between the heat transfer tube length from the hammering strike point and dirt resistance The relationship between the heat transfer tube length L from the hammering strike point and the dirt resistance fr1 in the heat transfer tube of the waste heat boiler is shown in FIG. As shown, the dirt resistance fr1 decreases in inverse proportion to the length L of the heat transfer tube from the hammering strike point. Such a phenomenon is caused by a decrease in the amplitude of the shock wave.

(2) Relationship between tube group length and soil resistance The relationship between tube group length Lg and soil resistance fr2 in a waste heat boiler is inversely proportional to tube group length Lg, as shown in FIG. The dirt resistance fr2 is reduced. Such a phenomenon is caused by a decrease in dust concentration from the inlet to the outlet of the boiler.
(3) Relation between gas temperature and dirt resistance As shown in FIG. 6, the relation between the gas temperature tg flowing into the waste heat boiler and the dirt resistance fr3 is shown in FIG. 6 when the inflowing gas temperature tg falls from tg1 to tg2. The dirt resistance fr3 also becomes smaller in proportion to. Such a phenomenon is caused by a decrease in the bonding force of dust particles.

(4) Relationship between left-right drift in the gas flow tube group and dirt resistance The relationship between the left-right drift in the gas flow tube group and the dirt resistance fr4 in the waste heat boiler is shown by a solid arrow in FIG. As indicated by the dotted arrows, this is caused by the shape of the boiler inlet / outlet duct and the dust adhesion state of the tube group.
(5) Relationship between vertical drift in the gas flow tube group and dirt resistance The relationship between vertical drift in the gas flow tube group and the dirt resistance fr5 in the waste heat boiler is shown in FIG. As indicated by the dotted arrows, this is caused by the shape of the boiler inlet / outlet duct and the dust adhesion state of the tube group.

If it becomes possible to numerically grasp the dirt resistance that increases due to the various factors as described above for each heat transfer surface block (each tube group) and perform operation control of the hammering device according to this, The required striking force can be applied according to the level of dirt resistance (dust adhesion / deposition thickness) of each heat transfer surface block.
Therefore, in order to solve the above-mentioned conventional problems, the object of the present invention is to hit the heat transfer tubes of each heat transfer surface block according to the level of dirt resistance of each heat transfer surface block of the waste heat boiler. It is to devise the operation of the hammering device so that it can.

  The waste heat boiler according to the present invention impairs the durability of the hammering device by applying appropriate impact energy required for the heat transfer surface block according to the level of dirt resistance of the heat transfer surface block. It is intended to perform environmentally friendly and effective dust removal.

The means taken to solve the above problems will be described below together with the action.
(1) A waste heat boiler according to the present invention (corresponding to claim 1) includes a heat transfer surface block in which a large number of heat transfer tubes are arranged, and dust adhered to each heat transfer tube of the heat transfer surface block by applying vibration. Assuming a hammering operation schedule control system for a waste heat boiler equipped with a hammering device to be removed and a hammering operation control device for controlling the operation of this hammering device, the system consists of the following (a) to (d) It is.
(A) Gas flow rate calculation means for calculating the gas flow rate based on the boiler evaporation amount and the boiler inlet / outlet gas temperature in the rated load operation ,
(B) based on the inlet / outlet gas temperature of the gas flow rate and the heat transfer Netsumen block, and fouling resistance calculating means for calculating a stain which resistance measurements of said transmission Netsumen block,
(C) fouling which the resistance measurement values of the heat transfer Netsumen block, based on the stain resistance planned value set in advance, the hammer to change at least one of the number of hits the hammering device, striking time, or impact force A ring operation schedule calculation means,
(D) Appropriate blow should be applied to the heat transfer surface block according to the degree of contamination.

By adopting the configuration as described above, based on the gas flow rate and the gas temperatures on the gas inlet side and the gas outlet side of the heat transfer surface block, the dirt resistance planned value and the dirt resistance measurement value of the heat transfer surface block are calculated. The degree of dirt on the heat transfer surface block can be recognized by comparing the dirt resistance planned value with the dirt resistance measurement value.
And, according to the degree of contamination of the heat transfer surface block, the number of hits, hitting time, or hitting force applied to the heat transfer surface block by the hammering device can be changed. Appropriate impact energy required according to the degree can be applied.

(2) In the waste heat boiler hammering operation schedule control system in (1) above, a plurality of heat transfer surface blocks are provided, and based on the inlet / outlet gas temperature of each heat transfer surface block, The dirt resistance planned value and the dirt resistance measurement value are calculated, and an appropriate blow can be applied to each heat transfer surface block according to the degree of dirt. (Corresponding to claim 2)
According to such a configuration, the soil resistance plan value and the soil resistance measurement value of each heat transfer surface block are calculated while considering the influence of the gas temperature on the gas inlet side and gas outlet side of the surrounding heat transfer surface block. Therefore, it is possible to calculate a more accurate dirt resistance measurement value, and it is possible to apply an appropriate blow according to the degree of dirt.

(3) In the hammering operation schedule control system for the waste heat boiler in (2) above, the hammering device in each heat transfer surface block is based on the planned dirt resistance value and the measured dirt resistance value of each of the plurality of heat transfer surface blocks. At least one of the number of hits, hitting time, or hitting force can be changed. (Corresponding to claim 3)
According to such a configuration, it is possible to change the number of hits, the hitting time, or the hitting force of the hammering device in each heat transfer surface block while considering the influence of the degree of contamination of the surrounding heat transfer surface blocks. It is possible to give a more appropriate impact energy to each heat transfer surface block.

The effects of the present invention are summarized as follows.
Based on the dirt resistance planned value and dirt resistance measurement value of the heat transfer surface block, the degree of dirt of the heat transfer surface block can be recognized, and the hammering device applied to the heat transfer surface block according to the degree of dirt Since the number of hits, the hitting time, or the hitting force can be changed, the hammering device can apply appropriate hitting energy required for the heat transfer surface block according to the degree of contamination.
As a result, it is possible to minimize the damage of the entire device without impairing the durability of the hammering device, and it is possible to reduce noise and perform environmentally friendly and effective dust removal.

In addition, even when a plurality of heat transfer surface blocks are arranged, the contamination resistance planned value of each heat transfer surface block is considered while considering the influence of the gas temperature on the gas inlet side and gas outlet side of the surrounding heat transfer surface blocks. It is possible to calculate the dirt resistance measurement value, and further consider the influence of the dirt resistance planned value and dirt resistance measurement value of the surrounding heat transfer surface block, and the number of hammering device hits in each heat transfer surface block Since the striking time or striking force can be changed, more appropriate striking energy can be given to each heat transfer surface block.
As a result, in multiple heat transfer surface blocks, it is possible to minimize damage to the entire device without compromising the durability of the hammering device, reducing noise and providing effective environmentally friendly dust. Removal can be performed.

A control system for a hammering operation schedule of a waste heat boiler according to an embodiment of the present invention will be described with reference to FIGS. 1 to 3 and FIGS. 9 to 15.
[Configuration of heat transfer surface block and hammering device of waste heat boiler]
In the boiler body of the waste heat boiler, a plurality of heat transfer surface blocks (tube groups) composed of a large number of heat transfer tubes are arranged, and a hammering device is incorporated in each heat transfer surface block. .
First, the basic structure of the heat transfer surface block in the waste heat boiler of the present embodiment will be described with reference to FIGS. 1 is a schematic front view of the main part of the waste heat boiler, FIG. 2 is a schematic plan view of the main part of the waste heat boiler, and FIG. 3 is a schematic side view of the main part of the waste heat boiler.

The boiler body 25 is formed by the boiler outer shell walls 4a to 4e at the center, the upper boiler outer shell walls 5a to 5e, and the lower boiler outer shell walls 6a to 6d. In the internal space of the boiler body 25, a large number of heat transfer tubes (conduit-type heat transfer tubes) 1 (1a, 1b) are arranged at regular intervals to form a heat transfer surface block G (GA, GB). ing. Each end of the heat transfer tubes 1 (1a, 1b) is connected to the inlet header 2 or the outlet header 3 (3a, 3b) outside the upper boiler outer shell walls 5a to 5e.
Exhaust gas flows directly into the central space surrounded by the boiler outer shell walls 4a to 4e (the space surrounded by a, b, c, and d in FIG. 3), but the upper boiler outer walls 5a to 5e. The exhaust gas does not flow directly into the upper space surrounded by (a space surrounded by a, b, e, and f in FIG. 3). A lower space surrounded by the lower boiler outer shell walls 6a to 6d forms a hopper.

In the upper space surrounded by the boiler outer shell walls 5a to 5e, connecting shafts 7 (7a, 7b) are provided between the odd-numbered and even-numbered heat transfer tubes 1 (1a, 1b). The pipe portions of the heat transfer tubes 1 (1a, 1b) located on both sides of these connecting shafts 7 (7a, 7b) are connected to the adjacent connecting shafts 7 (7a, 7b) via connecting fittings 17 (17a, 17b). (See FIGS. 1 and 2).
In this way, the connecting shafts 7 (7a, 7b), to which the heat transfer tubes 1 (1a, 1b) are fixed on both sides, are suspended beams 16 fixed to the boiler body 25 by a pair of hinge mechanisms 27 (27a, 27b). (16a, 16b) is supported so as to be swingable in the longitudinal direction of each connecting shaft 7 (7a, 7b). The hinge mechanism 27 (27a, 27b) includes the suspension fitting 11 (11a, 11b), the hinge member 12 (12a, 12b), the pin 13 (13a, 13b), the suspension rod 14 (14a, 14b), and the nut 15 ( 15a, 15b).
With such a configuration, the pair of heat transfer tubes 1 (1a, 1b) are supported with respect to the boiler body 25 via the respective connecting shafts 7 (7a, 7b) and the hinge mechanisms 27 (27a, 27b). Yes.

Bellows 8a and 8b for gas-sealing through portions of the connecting shaft 7 (7a and 7b) are mounted on portions of the connecting shaft 7 (7a and 7b) protruding from the boiler outer shell walls 5a and 5b. . In addition, wrapping rods 10a and 10b are coupled to distal ends of protruding portions of the connecting shafts 7 (7a and 7b) via elastic bodies (for example, disc springs) 9a and 9b, respectively.
Outside the wrapping rods 10a and 10b, air knockers (blowing devices) 20a and 20b are provided at positions facing the wrapping rods 10a and 10b. When the air knockers 20a and 20b are used to strike the wrapping rods 10a and 10b, the connecting shafts 7 (7a and 7b) and the pair of heat transfer tubes 1 (1a and 1b) connected thereto are connected via the elastic bodies 9a and 9b. Vibration can be applied to 1b). At this time, the elastic bodies 9a and 9b play a role of storing impact energy and reducing the impact force.
In this way, the connecting shaft 7, the connecting fitting 17, the hinge mechanism 27, the bellows 8a and 8b, the elastic bodies 9a and 9b, the wrapping rods 10a and 10b, and the air knockers 20a and 20b are composed of the heat transfer tubes 1 (1a and 1b). A hammering device that applies vibrations to the device is configured.
Reference numerals 18 and 19 in FIGS. 1 and 3 denote a baffle plate and a dust discharge device.

[Configuration of the entire waste heat boiler]
Next, the overall configuration of the waste heat boiler according to the present embodiment will be described with reference to FIGS. 9 is a schematic front view of the waste heat boiler, FIG. 10 is a schematic plan view of the waste heat boiler, and FIG. 11 is a schematic side view of the waste heat boiler.
A heat transfer surface block G in which a hammering device is incorporated is disposed in an internal space through which exhaust gas from the waste heat boiler flows. The heat transfer surface blocks G are arranged in two series of A and B series along the flow direction of the exhaust gas, and five heat transfer surface blocks G1 to G5 (A / B) are arranged in each series. Has been. ((A / B) indicates that they are similarly arranged in the A series and the B series.)

A large number of hammering devices are incorporated in each of the heat transfer surface blocks G1 to G5 (A / B), but the number is different for each heat transfer surface block. The assembly of hammering devices for each of the heat transfer surface blocks G1 to G5 (A / B) is referred to as hammering device blocks B-1 to B-5 (A / B).
The most upstream heat transfer surface block G1 (A / B) includes a hammering device block B-1 (A / B) having 14 hammering devices (n1 to n14), respectively. In G2 (A / B), a hammering device block B-2 (A / B) having 15 hammering devices (n15 to n29) is added to the third heat transfer surface block G3 (A / B). The hammering device block B-3 (A / B) having 16 hammering devices (n30 to n45) is connected to the fourth heat transfer surface block G4 (A / B), respectively. Hammering device block B-4 (A / B) having pedestals (n46 to n62) has 18 hammering devices (n63 to n80) in the most downstream heat transfer surface block G5 (A / B). Hammering device block B- (A / B) are respectively provided. (See FIGS. 9 and 10)

  In addition, gas temperature detectors t1 to t18 (a / B) is provided. ((A / b) indicates that they are similarly arranged in the A series and the B series.)

[Configuration of Hammering Operation Control Device]
The configuration of the hammering operation control device will be described with reference to FIGS. FIG. 12 is a block diagram of the hammering operation control device, and FIG. 13 is a block diagram for explaining the hammering operation.
As shown in FIG. 12, the hammering operation control device 30 includes a control means 31 having a CPU, a RAM, a ROM, a timer and the like, and respective hammering device blocks B-1 to B-5 (A / B). Drive circuits 32a to 32e for driving the air knockers 20a and 20b. The control means 31 receives input signals from an operation unit such as a keyboard and gas temperature detectors t1 to t18 (a / b) of each heat transfer surface block, as well as boiler steam pressure, boiler steam temperature, boiler feed water temperature, Various calculations are performed in response to input signals related to the amount of boiler evaporation, boiler inlet gas temperature, boiler outlet gas temperature, boiler inlet / outlet gas pressure, and gas composition, and the driving circuit 32a of the hammering device block is based on the calculation results. ~ 32e and the operation air pressure setting means 33 are output with a control signal to drive each air knocker 20a, 20b with an appropriate number of hits, hitting time, and hitting force (corresponding to dirt resistance of the heat transfer surface block). .
In this way, the dust adhered and deposited on the heat transfer tubes 1a and 1b of the heat transfer surface blocks G1 to G5 (A / B) can be effectively removed.

As shown in FIG. 13, the control means 31 includes boiler gas flow rate calculation means 35, dirt resistance calculation means 36a, 36b... For each heat transfer surface block, and operation schedule calculation means 37a, 37b for each hammering device block. …have.
The boiler gas flow rate calculation means 35 receives input signals relating to boiler steam pressure, boiler steam temperature, boiler feed water temperature, boiler evaporation amount, boiler inlet gas temperature, boiler outlet gas temperature, boiler inlet / outlet gas pressure, and gas composition. Then, the gas flow rate Gc is calculated. The dirt resistance calculating means 36a, 36b... For each heat transfer surface block receive input signals relating to the gas flow rate Gc and the gas temperature of each heat transfer surface block G1 (A / B), G2 (A / B). The respective dirt resistance planned values DA, DB... And the dirt resistance measured values Da, Db.

  Further, the operation schedule calculation means 37a, 37b,... Of each of the hammering device blocks B-1 to B-5 (A / B) include the soil resistance planned values DA, DB,. In response to the input signal relating to the values Da, Db..., The deviation between the dirt resistance planned values DA, DB... And the dirt resistance measurement values Da, Db. The sequential operation interval T1, the striking interval T2, the operation time T3, the downtime T4, and the operating air pressure Ps of the device block are calculated. Thereby, the number R of hits, the hitting time H, and the hitting force F of each hammering device block are set.

[Operation of hammering device]
Next, the hammering operation of the waste heat boiler according to the present embodiment will be described with reference to FIGS. FIG. 14 is an operation schedule of the hammering device block, and FIG. 15 is a flowchart of the hammering operation.
Before the operation of the waste heat boiler is started, the operation schedule of each hammering device block B-1 to B-5 (A / B) is initialized. This initial setting is performed for each hammering device block based on experience so far, as shown in FIG. 14, along with the sequential operation interval T1, hammering interval T2, operation time T3, and pause time T4. By determining the air pressure Ps, the number of hits R, the hitting time H, and the hitting force F are set.

但し、Ｅ：時間当りのボイラーの蒸発量（Kg／Hr）
ｉｓ：発生蒸気のエンタルピー（Kcal／Kg）
ｉｗ：給水のエンタルピー（Kcal／Kg）
ｉｇ_１：ボイラー入口ガスのエンタルピー（Kcal／Ｎｍ^３）
ｉｇ_２：ボイラー出口ガスのエンタルピー（Kcal／Ｎｍ^３）
η_Ｂ：ボイラー効率 When the operation of the waste heat boiler is started and the rated load operation is started (step S1), the boiler gas flow rate Gc is calculated from the boiler evaporation amount and the boiler inlet / outlet gas temperature (step S2). This gas flow rate Gc can be calculated by the following equation.

E: Boiler evaporation per hour (Kg / Hr)
is: Enthalpy of generated steam (Kcal / Kg)
iw: Enthalpy of water supply (Kcal / Kg)
ig ₁ : Boiler inlet gas enthalpy (Kcal / Nm ³ )
ig _2: enthalpy of the boiler exit gas (Kcal / ^Nm 3)
η _B : Boiler efficiency

但し、ｋ：熱貫流率（Kcal／ｍ^２ｈ℃）
α_ｏ：管外の熱伝達係数（Kcal／ｍ^２ｈ℃）
α_ｉ：管内の熱伝達係数（Kcal／ｍ^２ｈ℃）
λ：管の熱伝導率（Kcal／ｍｈ℃）
ｔ：管の厚さ（ｍ）
ＤA(ｆr)：汚れ抵抗の計画値（ｍ^２ｈ℃／Kcal） Next, from the calculated gas flow rate Gc and the inlet / outlet gas temperature of each heat transfer surface block, a planned value DA and a measured value Da of the dirt resistance in each heat transfer surface block are calculated (step S3).
The contamination resistance planned value DA can be calculated from the following equation.

However, k: Thermal conductivity (Kcal / m ² h ° C)
α _o : Heat transfer coefficient outside the tube (Kcal / m ² h ° C)
α _i : Heat transfer coefficient in the tube (Kcal / m ² h ° C)
λ: Thermal conductivity of tube (Kcal / mh ° C)
t: tube thickness (m)
DA (fr): Planned value of dirt resistance (m ² h ° C / Kcal)

  The measured value Da of the dirt resistance during operation can be calculated backward from the measurement data using the above general formula, but a detailed calculation method is omitted here.

Next, the planned value DA and the measured value Da of the dirt resistance are compared (step S4). If the values are substantially the same, the initial setting of the hammering operation schedule is not changed (step S7), and the hammering operation is performed. Execute (Steps S9 and S10).
In step S4, when the planned value DA and the measured value Da are not substantially the same value and the measured value Da is larger than the planned value DA (step S5), the dirt resistance planned values DA and DB for each heat transfer surface block. .. And dirt resistance measured values Da, Db... Are calculated to calculate the hammering sequential operation interval T1, the striking interval T2, the operation time T3, the downtime T4, and the operating air pressure Ps. The hammering operation is executed (steps S9 and S10) by increasing the number of hits R, the hitting time H, or the hitting force F from the initial setting (step S6).

  If the measured value Da is not larger than the planned value DA in step S5 (if the measured value Da is smaller than the planned value DA), the dirt resistance plan for each heat transfer surface block is the same as in step S6. Based on the deviation between the values DA, DB... And the dirt resistance measurement values Da, Db... The hammering operation is executed (steps S9 and S10) by reducing the number of hits R, the hitting time H, or the hitting force F from the initial setting (step S8).

  When the hammering operation is completed (step S10), the hammering operation is stopped only during the stop time T4. At this time, it waits in a resting state until the resting time ends or the operation of the waste heat boiler is stopped (steps S11 and S12). When the pause time ends in step S11, the process returns to step 2 and the subsequent operations are repeated. When the boiler operation is stopped in step S12, the hammering operation is terminated (step S13).

  As described above, during the operation of the waste heat boiler, the number of hits R, the hitting time H, or the hitting force F for each heat transfer surface block corresponding to the magnitude of the dirt resistance for each heat transfer surface block. Therefore, it is possible to reduce useless damaged parts, to save labor and to reduce noise, and to make a hammering system in consideration of the earth, people, and the environment in a broad sense.

These are the schematic front views of the principal part of the waste heat boiler in the Example of this invention. These are the schematic plan views of the principal part of the waste-heat boiler in an Example. These are the schematic side views of the principal part of the waste-heat boiler in an Example. Fig. 4 is a schematic diagram showing the relationship between the length from the hammering strike point and the dirt resistance in a heat transfer tube of a waste heat boiler. Is a schematic diagram of the relationship between the length of the tube group and the dirt resistance in the heat transfer tube of the waste heat boiler. Is a schematic diagram showing the relationship between gas temperature and dirt resistance in a heat transfer tube of a waste heat boiler. Fig. 2 is a schematic diagram showing the relationship between the drift in the left-right direction of the gas flow tube group and the dirt resistance in the heat transfer tube of the waste heat boiler. Fig. 4 is a schematic diagram showing the relationship between the drift in the vertical direction of the gas flow tube group and the dirt resistance in the heat transfer tube of the waste heat boiler. These are the typical front views of the waste-heat boiler in the Example of this invention. These are the typical top views of the waste-heat boiler in the Example of this invention. These are the typical side views of the waste-heat boiler in an Example. These are the block diagrams of the hammering operation control apparatus of the waste heat boiler by the same Example. These are the block diagrams explaining the hammering driving | operation operation | movement of the waste-heat boiler by an Example. These are the operation schedules of the hammering device block according to the embodiment. These are the flowcharts of the hammering driving | operation operation | movement of the waste heat boiler by the Example similarly. These are the schematic diagrams of the conventional waste heat boiler, (a) is a front view, (b) is a side view. These are the principal part enlarged views of the conventional waste heat boiler, (a) is a front view, (b) is a side view.

Explanation of symbols

1, 1a, 1b ... Heat transfer tube (for waste heat boiler)
2 ... Inlet header 3a, 3b ... Outlet header 4a-4e ... Boiler shell wall (central part)
5a to 5e ... boiler outer shell wall (upper part) 6a to 6d ... boiler outer shell wall (lower part)
7, 7a, 7b ... connecting shaft 8a, 8b ... bellows 9a, 9b ... elastic body (disc spring)
10a, 10b ... Wrapping rods 11, 11a, 11b ... Suspension brackets 12, 12a, 12b ... Hinge members 13, 13a, 13b ... Pins 14, 14a, 14b ... Suspension rods 15, 15a, 15b ... Nuts 16, 16a, 16b ... Suspension beam 17, 17a, 17b ... Connecting bracket 18 ... Baffle plate 19 ... Dust ejecting device 20a, 20b ... Air knocker (blowing device) 25 ... Boiler body 27, 27a, 27b ... Hinge mechanism 30 ... Control device 31 ... Control means 32a ~ 32e ... Hammering device block drive circuit 33 ... Operating air pressure setting means 35 ... Boiler gas flow rate calculating means 36a, 36b ... Dirt resistance calculating means 37a, 37b ... Hammering operation schedule calculating means B-1 to B-5 ... Hammer Ring device block G, G1-G5 ... Heat transfer surface blow (Tube group)
n1 to n80 ... number of hammering devices t1 to t18 ... gas temperature detector T1 ... sequential operation interval T2 ... striking interval T3 ... operation time T4 ... pause time

Claims (3)

A heat transfer surface block in which a large number of heat transfer tubes are arranged, a hammering device that removes dust adhering to each heat transfer tube of this heat transfer surface block, and a hammering operation that controls the operation of this hammering device In a hammering operation schedule control system for a waste heat boiler comprising a control device,
A gas flow rate calculation means for calculating a gas flow rate based on the boiler evaporation amount and the boiler inlet / outlet gas temperature in the rated load operation ;
Based on the inlet / outlet gas temperature of the gas flow rate and the heat transfer Netsumen block, and fouling resistance calculating means for calculating a stain which resistance measurements of said transmission Netsumen block,
Fouling is a resistance measurement of the heat transfer Netsumen block, based on the stain resistance planned value set in advance, hit number of the hammering device, striking time, or hammering operation schedule for changing at least one of the striking force Comprising a computing means,
A waste heat boiler hammering operation schedule control system, wherein an appropriate blow is applied to the heat transfer surface block in accordance with the degree of contamination. The heat transfer Netsumen block provided with a plurality of, based on the inlet / outlet gas temperature of Kakuden'netsumen block calculates the stain is resistance measurements of Kakuden'netsumen blocks, each relative Kakuden'netsumen block The hammering operation schedule control system for a waste heat boiler according to claim 1, wherein an appropriate blow is applied according to the degree of contamination. The plurality of heat-transfer surface blocks each stain is based on the resistance measurement values, number of hits hammering apparatus in Kakuden'netsumen block shot time, or claims, characterized in modifying at least one of the striking force Item 3. A waste heat boiler hammering operation schedule control system according to Item 2.

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