JP5402624B2 - Boiler ventilation pressure control device and operation method thereof - Google Patents

Boiler ventilation pressure control device and operation method thereof Download PDF

Info

Publication number
JP5402624B2
JP5402624B2 JP2009296789A JP2009296789A JP5402624B2 JP 5402624 B2 JP5402624 B2 JP 5402624B2 JP 2009296789 A JP2009296789 A JP 2009296789A JP 2009296789 A JP2009296789 A JP 2009296789A JP 5402624 B2 JP5402624 B2 JP 5402624B2
Authority
JP
Japan
Prior art keywords
boiler
pressure
exhaust gas
damper
outlet
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
JP2009296789A
Other languages
Japanese (ja)
Other versions
JP2011137574A (en
Inventor
宏 清水
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
IHI Corp
Original Assignee
IHI Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by IHI Corp filed Critical IHI Corp
Priority to JP2009296789A priority Critical patent/JP5402624B2/en
Publication of JP2011137574A publication Critical patent/JP2011137574A/en
Application granted granted Critical
Publication of JP5402624B2 publication Critical patent/JP5402624B2/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Landscapes

  • Regulation And Control Of Combustion (AREA)

Description

本発明は、ボイラ通風圧力制御装置及びその運転方法に関し、特に排ガスを脱硫せずに排気できる低硫黄燃料を燃焼する多缶ボイラにおいて、排ガスの脱硫が必要な高硫黄燃料も燃焼できるようにする際の設備費用の低減を図ると共に、ボイラの通風圧力を安定させられるようにしたボイラ通風圧力制御装置及びその運転方法に関する。   The present invention relates to a boiler ventilation pressure control device and a method for operating the same, and in particular, in a multi-can boiler that burns low sulfur fuel that can be exhausted without desulfurizing exhaust gas, high sulfur fuel that requires desulfurization of exhaust gas can also be combusted. The present invention relates to a boiler ventilation pressure control device and a method for operating the same, which can reduce facility costs and stabilize the ventilation pressure of a boiler.

従来より、ボイラを複数台設置し、ボイラ負荷信号（発電設備では出力指令）に応じてボイラの燃焼台数を調節するボイラ多缶システムが知られている。多缶ボイラでは、複数のボイラは単独で燃焼して蒸気を発生することができ、且つ各ボイラで発生した蒸気は集合されて蒸気を必要とする箇所へ供給されるようになっており、必要な蒸気圧力に応じて必要な台数分のボイラを燃焼するようにしている。   2. Description of the Related Art Conventionally, a boiler multi-can system in which a plurality of boilers are installed and the number of boiler combustions is adjusted in accordance with a boiler load signal (output command in a power generation facility) is known. In a multi-can boiler, a plurality of boilers can be burned independently to generate steam, and the steam generated in each boiler is collected and supplied to the place where the steam is required, which is necessary The required number of boilers are burned according to the appropriate steam pressure.

図４は多缶ボイラの一例を示す概略フローチャートであり、図４ではボイラ１ａとボイラ１ｂが並設された場合を示しており、各ボイラ１ａ，１ｂには、押込通風機２ａ，２ｂ（ＦＤＦ）による空気と燃料が供給されて燃焼し、燃焼によって生じた排ガスは排ガスダクト３ａ，３ｂにより電気集塵器４ａ，４ｂ（ＥＰ）に導かれて除塵された後、煙突５ａ，５ｂに導かれるようになっている。尚、ボイラ排ガスの脱硝を行う必要がある場合には脱硝装置を備えるようにしているが、図４では省略している。   FIG. 4 is a schematic flowchart showing an example of a multi-can boiler. FIG. 4 shows a case where a boiler 1a and a boiler 1b are arranged side by side, and each of the boilers 1a and 1b includes a forced air blower 2a and 2b (FDF). ) Is supplied and burned, and exhaust gas generated by the combustion is guided to the electric dust collectors 4a and 4b (EP) by the exhaust gas ducts 3a and 3b and then removed to the chimneys 5a and 5b. It is like that. In addition, when it is necessary to denitrate boiler exhaust gas, a denitration device is provided, but is omitted in FIG.

一方、ボイラで燃焼する燃料としては、天然ガス等のガス、軽油、重油、オルマリジョン、石炭、バイオマス等が用いられるが、これらの燃料については、排ガスを脱硫せずに排気できる低硫黄燃料（第２の燃料）と、排ガスの脱硫が必要な高硫黄燃料（第１の燃料）が国、自治体の条例等によって決められている。従って、高硫黄燃料（第１の燃料）を燃焼するボイラにおいては脱硫設備を備える必要があるが、図４では低硫黄燃料（第２の燃料）を燃焼するボイラ１ａ，１ｂを示しているため、排ガス中の硫黄を除去する脱硫設備は備えられていない。   On the other hand, gas such as natural gas, light oil, heavy oil, immersion, coal, biomass, etc. are used as the fuel burned in the boiler. These fuels are low-sulfur fuels (No. 1) that can be exhausted without desulfurizing the exhaust gas. No. 2 fuel) and high sulfur fuel (first fuel) that requires desulfurization of exhaust gas are determined by national and local regulations. Therefore, it is necessary to provide a desulfurization facility in a boiler that burns high sulfur fuel (first fuel), but FIG. 4 shows boilers 1a and 1b that burn low sulfur fuel (second fuel). No desulfurization equipment for removing sulfur in exhaust gas is provided.

一方、天然ガスやＡ重油のような含硫黄分の低い低硫黄燃料は一般に高価であるために、図４に示したボイラ１ａ，１ｂにおいて、前記低硫黄燃料と、安価であるが硫黄含有量が多いＣ重油やオリマルジョン等の高硫黄燃料とを切り替えて燃焼できるようにボイラを改造する要求がある。   On the other hand, low sulfur fuels with low sulfur content, such as natural gas and heavy oil A, are generally expensive. Therefore, in the boilers 1a and 1b shown in FIG. There is a need to remodel the boiler so that it can be burned by switching to high-sulfur fuel such as C heavy oil or olimarsion, which is often present.

図４の多缶ボイラにおいて、各ボイラ１ａ，１ｂで低硫黄燃料と高硫黄燃料を切り替えて燃焼できるようにするには、図５に示す如く、排ガスダクト３ａ，３ｂの夫々に、排ガスから熱回収を行う前段の熱交換器６ａ，６ｂと、吸収塔７ａ，７ｂと、排ガスを加熱して煙突５ａ，５ｂからの白煙防止を行う後段の熱交換器８ａ，８ｂとからなる脱硫設備９ａ，９ｂを備えることが考えられる。また、前記したように排ガスダクト３ａ，３ｂに脱硫設備９ａ，９ｂを設置すると、該脱硫設備９ａ，９ｂによる圧力損失が大きくなって、押込通風機２ａ，２ｂによる燃焼空気の押込み能力では排ガスを排気できなくなるため、前記脱硫設備９ａ，９ｂの夫々の出口にブースタファン１０ａ，１０ｂを設置する必要がある。   In the multi-can boiler of FIG. 4, in order to switch the low sulfur fuel and the high sulfur fuel in each boiler 1a, 1b so as to be able to burn, as shown in FIG. 5, heat from the exhaust gas is supplied to each of the exhaust gas ducts 3a, 3b. Desulfurization equipment 9a comprising heat exchangers 6a and 6b at the front stage for recovery, absorption towers 7a and 7b, and heat exchangers 8a and 8b at the rear stage for heating the exhaust gas and preventing white smoke from the chimneys 5a and 5b. , 9b. Further, when the desulfurization facilities 9a and 9b are installed in the exhaust gas ducts 3a and 3b as described above, the pressure loss due to the desulfurization facilities 9a and 9b becomes large, and the exhaust air is not allowed to be exhausted by the pushing capacity of the combustion air by the forced draft fans 2a and 2b. Since it becomes impossible to exhaust, it is necessary to install booster fans 10a and 10b at the outlets of the desulfurization facilities 9a and 9b.

一般的なボイラの多缶設置システムとしては、ボイラが燃焼を停止している場合に、空気量調節手段により炉内の圧力を所定の圧力に保つために必要な量の空気を炉内へ導入する制御を行うようにしたものがある（例えば、特許文献１等参照）。   As a general boiler multi-can installation system, when the boiler has stopped burning, the air volume adjustment means introduces the necessary amount of air into the furnace to keep the pressure in the furnace at a predetermined level. In some cases, the control is performed (see, for example, Patent Document 1).

特開２００１−１３２９４０号公報JP 2001-132940 A

しかし、排ガスを脱硫せずに排気できる低硫黄燃料を燃焼している多缶ボイラにおいて、排ガスの脱硫が必要な高硫黄燃料も燃焼できるようにするために、図５に示した如く排ガスダクト３ａ，３ｂの夫々に脱硫設備９ａ，９ｂを設置した場合には、ボイラ１ａ，１ｂと同数の脱硫設備９ａ，９ｂが必要になり、従って改造のための設備費用が大幅に増加してしまうという問題がある。   However, in a multi-can boiler that burns low-sulfur fuel that can be exhausted without desulfurizing exhaust gas, in order to be able to combust high-sulfur fuel that requires desulfurization of exhaust gas as well, as shown in FIG. When the desulfurization facilities 9a and 9b are installed in each of the boilers 3b, the same number of desulfurization facilities 9a and 9b as the boilers 1a and 1b are required, and therefore the cost of the equipment for remodeling increases significantly. There is.

本発明は、上記実情に鑑みてなしたもので、排ガスを脱硫せずに排気できる低硫黄燃料を燃焼する多缶ボイラにおいて、低い設備費用で排ガスの脱硫が必要な高硫黄燃料も燃焼できるようにし、且つボイラの通風圧力も安定させられるようにしたボイラ通風圧力制御装置及びその運転方法を提供しようとするものである。   The present invention has been made in view of the above circumstances. In a multi-can boiler that burns low-sulfur fuel that can be exhausted without desulfurizing exhaust gas, high-sulfur fuel that requires desulfurization of exhaust gas can be combusted at low equipment costs. In addition, the present invention is to provide a boiler ventilation pressure control device and an operation method thereof that can stabilize the ventilation pressure of the boiler.

本発明は、第１の燃料と第１の燃料より硫黄成分が少ない第２の燃料とを切り替えて燃焼する複数のボイラを有し該各ボイラからの排ガスを対応した複数の煙突に導く多缶ボイラの前記各ボイラからの排ガスを１つの脱硫設備により脱硫するようにしたボイラ通風圧力制御装置であって、
前記各ボイラの排ガスダクトを統合する合流ダクトと、
該合流ダクトに備えた１つの脱硫設備と、
該脱硫設備出口の排ガスを分岐して前記各煙突に導く分岐ダクトと、
該各分岐ダクトに備えたブースタファンと、
前記各排ガスダクトと各分岐ダクトの煙突入口とを連通するバイパスダクトと、
前記各排ガスダクトのバイパスダクト接続部下流に備えたボイラ出口圧力調節ダンパと、
前記ボイラの起動時は前記ボイラ出口圧力調節ダンパを微開した後開スケジュールにより開作動すると共に、この時のボイラ出口と煙突入口の差圧が無くなるようにボイラ出口圧力調節ダンパの開度を制御し、ボイラの通常運転時は前記各ボイラ出口の圧力が第１設定圧力に保持されるように前記ボイラ出口圧力調節ダンパを制御し、ボイラの停止時は前記ボイラ出口圧力調節ダンパをボイラ出口と煙突入口の差圧が無くなるように制御し、その後、閉スケジュールにより閉作動するように前記ボイラ出口圧力調節ダンパを制御する第１圧力制御器と、
前記各分岐流路のブースタファン入口に備えた誘引圧力調節ダンパと、
前記ボイラの通常運転時に前記脱硫設備入口の圧力が第２設定圧力に保持されるように前記誘引圧力調節ダンパを制御する第２圧力制御器と、
を備えたことを特徴とするボイラ通風圧力制御装置、に係るものである。 The present invention has a plurality of boilers for switching and burning a first fuel and a second fuel having a lower sulfur component than the first fuel, and has multiple cans for guiding exhaust gases from the boilers to corresponding chimneys. A boiler ventilation pressure control device configured to desulfurize exhaust gas from each boiler of the boiler by one desulfurization facility,
A merging duct for integrating the exhaust gas ducts of the boilers;
One desulfurization facility provided in the junction duct;
A branch duct for branching the exhaust gas at the outlet of the desulfurization equipment and leading it to each chimney;
A booster fan provided for each branch duct;
A bypass duct communicating the exhaust gas duct and the chimney inlet of each branch duct;
A boiler outlet pressure adjusting damper provided downstream of the bypass duct connecting portion of each exhaust gas duct;
When the boiler is started, the boiler outlet pressure adjustment damper is opened slightly and then opened according to the opening schedule. At the same time, the opening degree of the boiler outlet pressure adjustment damper is controlled so that the differential pressure between the boiler outlet and the chimney inlet is eliminated. The boiler outlet pressure adjusting damper is controlled so that the pressure at each boiler outlet is maintained at the first set pressure during normal operation of the boiler, and the boiler outlet pressure adjusting damper is used as the boiler outlet when the boiler is stopped. A first pressure controller for controlling the boiler outlet pressure adjusting damper so as to eliminate the differential pressure at the chimney inlet, and then to close according to a closing schedule;
An attraction pressure adjusting damper provided at the booster fan inlet of each branch passage;
A second pressure controller for controlling the attraction pressure adjusting damper so that the pressure at the desulfurization facility inlet is maintained at a second set pressure during normal operation of the boiler;
A boiler ventilation pressure control device characterized by comprising:

上記ボイラ通風圧力制御装置において、前記排ガスダクトと分岐ダクトとバイパスダクトの夫々に開閉ダンパを備えることは好ましい。   In the boiler ventilation pressure control apparatus, it is preferable that an open / close damper is provided in each of the exhaust gas duct, the branch duct, and the bypass duct.

本発明は、前記請求項１又は２に記載のボイラ通風圧力制御装置の運転方法であって、
ボイラで低硫黄燃料を燃焼する際の排ガスはバイパスダクトに導くようにし、
一方、ボイラで高硫黄燃料を燃焼する際のボイラの起動時は、先ず脱硫設備及び当該ボイラに対応したブースタファンを運転し、前記ボイラ出口圧力調節ダンパと誘引圧力調節ダンパを微開にした後当該ボイラを駆動し、ボイラ排ガス圧力が安定した後、ボイラ負荷の増加に伴いボイラ出口圧力調節ダンパを開スケジュールにより開作動すると共に、この時のボイラ出口と煙突入口の差圧が無くなるようにボイラ出口圧力調節ダンパの開度を制御し、
ボイラの通常運転時は、前記各ボイラからの排ガス圧力が第１設定圧力に保持されるように前記ボイラ出口圧力調節ダンパを制御すると共に、前記脱硫設備入口の排ガス圧力が第２設定圧力に保持されるように前記誘引圧力調節ダンパを制御し、
ボイラの停止時は、当該ボイラの出力を低下させると共に前記ボイラ出口圧力調節ダンパと誘引圧力調節ダンパを微閉にして排ガス圧力が安定した後、ボイラ出口と煙突入口の差圧が無くなるように制御し、その後、閉スケジュールにより閉作動するようにボイラ出口圧力調節ダンパを制御し、当該ボイラが停止しボイラ出口圧力調節ダンパが全閉したら当該ボイラに対応したブースタファンの運転を停止する
ことを特徴とするボイラ通風圧力制御装置の運転方法、に係るものである。 The present invention is an operation method of the boiler ventilation pressure control device according to claim 1 or 2,
The exhaust gas when burning low-sulfur fuel in the boiler is led to the bypass duct,
On the other hand, when starting up the boiler when burning high-sulfur fuel in the boiler, first, the desulfurization equipment and the booster fan corresponding to the boiler are operated, and the boiler outlet pressure adjustment damper and the attractive pressure adjustment damper are opened slightly. After the boiler exhaust gas pressure is stabilized and the boiler exhaust gas pressure is stabilized, the boiler outlet pressure adjustment damper is opened according to the opening schedule as the boiler load increases, and the boiler outlet pressure and the chimney inlet at this time are eliminated. Control the opening of the outlet pressure adjustment damper,
During normal operation of the boiler, the boiler outlet pressure adjustment damper is controlled so that the exhaust gas pressure from each boiler is held at the first set pressure, and the exhaust gas pressure at the desulfurization facility inlet is held at the second set pressure. Controlling the attraction pressure adjustment damper to be
When the boiler is stopped, the output of the boiler is reduced and the boiler outlet pressure adjustment damper and the attractive pressure adjustment damper are finely closed to stabilize the exhaust gas pressure, and control is performed so that the differential pressure between the boiler outlet and the chimney inlet disappears. Then, the boiler outlet pressure adjustment damper is controlled so as to be closed according to the closing schedule, and when the boiler stops and the boiler outlet pressure adjustment damper is fully closed, the operation of the booster fan corresponding to the boiler is stopped. This relates to the operation method of the boiler ventilation pressure control device.

本発明のボイラ通風圧力制御装置及びその運転方法によれば、多缶ボイラにおいて１つの脱硫設備を備えることで、排ガスを脱硫せずに排気できる低硫黄燃料と、排ガスの脱硫が必要な高硫黄燃料とを燃焼することができ、且つボイラの通風圧力を安定させられるという優れた効果を奏し得る。   According to the boiler ventilation pressure control apparatus and the operating method of the present invention, a low-sulfur fuel capable of exhausting exhaust gas without desulfurization by providing one desulfurization facility in the multi-can boiler, and high sulfur requiring desulfurization of the exhaust gas The fuel can be combusted and an excellent effect of stabilizing the ventilation pressure of the boiler can be achieved.

本発明を実施する多缶ボイラの一例を示すフローチャートである。It is a flowchart which shows an example of the multi-can boiler which implements this invention. 第１圧力制御器の回路構成を示すブロック図である。It is a block diagram which shows the circuit structure of a 1st pressure controller. 第２圧力制御器の回路構成を示すブロック図である。It is a block diagram which shows the circuit structure of a 2nd pressure controller. 多缶ボイラの一例を示す概略フローチャートである。It is a schematic flowchart which shows an example of a multi-can boiler. 図４の多缶ボイラにおいて低硫黄燃料と高硫黄燃料を切り替えて燃焼できるように改造した場合の概略フローチャートである。FIG. 5 is a schematic flowchart when the multi-can boiler of FIG. 4 is modified so that low sulfur fuel and high sulfur fuel can be switched and burned.

以下、本発明の実施の形態を添付図面を参照して説明する。   Embodiments of the present invention will be described below with reference to the accompanying drawings.

図１は本発明を実施する形態の一例を示すフローチャートであり、図５と同一のものには同じ符号を付して詳細な説明は省略し、本発明の特徴部分についてのみ説明する。図１に示す如く、多缶ボイラの各ボイラ１ａ，１ｂにおける電気集塵器４ａ，４ｂ出口の排ガスダクト３ａ，３ｂを統合する合流ダクト１１を設け、該合流ダクト１１に前段の熱交換器６と吸収塔７と後段の熱交換器８からなる１つの脱硫設備９を配置する。更に、該脱硫設備９出口の排ガスを分岐して各煙突５ａ，５ｂに導く分岐ダクト１２ａ，１２ｂを設け、該各分岐ダクト１２ａ，１２ｂにブースタファン１０ａ，１０ｂを設ける。   FIG. 1 is a flowchart showing an example of an embodiment of the present invention. The same components as those in FIG. 5 are denoted by the same reference numerals, detailed description thereof is omitted, and only characteristic portions of the present invention will be described. As shown in FIG. 1, a merging duct 11 for integrating the exhaust gas ducts 3 a and 3 b at the outlets of the electric dust collectors 4 a and 4 b in the boilers 1 a and 1 b of the multi-can boiler is provided, and the heat exchanger 6 in the previous stage is provided in the merging duct 11. One desulfurization equipment 9 comprising an absorption tower 7 and a heat exchanger 8 at the rear stage is arranged. Further, branch ducts 12a and 12b for branching the exhaust gas at the outlet of the desulfurization facility 9 to lead to the chimneys 5a and 5b are provided, and booster fans 10a and 10b are provided for the branch ducts 12a and 12b.

前記各排ガスダクト３ａ，３ｂにおける電気集塵器４ａ，４ｂ出口と、前記各分岐ダクト１２ａ，１２ｂの煙突５ａ，５ｂ入口とをバイパスダクト１３ａ，１３ｂにより連通する。   The outlets of the electrostatic precipitators 4a and 4b in the exhaust gas ducts 3a and 3b and the chimneys 5a and 5b of the branch ducts 12a and 12b communicate with each other by bypass ducts 13a and 13b.

前記各排ガスダクト３ａ，３ｂにおけるバイパスダクト１３ａ，１３ｂの接続部より下流位置にはボイラ出口圧力調節ダンパ１４ａ，１４ｂを夫々設け、該各ボイラ出口圧力調節ダンパ１４ａ，１４ｂを制御するための第１圧力制御器１５ａ，１５ｂを設ける。該第１圧力制御器１５ａ，１５ｂには、前記各ボイラ出口圧力調節ダンパ１４ａ，１４ｂの入口に設けたボイラ出口圧力計１６ａ，１６ｂで検出した圧力と、煙突５ａ，５ｂの入口に設けた煙突入口圧力計２０ａ，２０ｂで検出した圧力が入力されている。   Boiler outlet pressure adjusting dampers 14a and 14b are provided at positions downstream of the connecting portions of the bypass ducts 13a and 13b in the exhaust gas ducts 3a and 3b, respectively, and a first outlet for controlling the boiler outlet pressure adjusting dampers 14a and 14b is provided. Pressure controllers 15a and 15b are provided. The first pressure controllers 15a and 15b include a pressure detected by the boiler outlet pressure gauges 16a and 16b provided at the inlets of the boiler outlet pressure adjusting dampers 14a and 14b, and a chimney provided at the inlets of the chimneys 5a and 5b. The pressure detected by the inlet pressure gauges 20a and 20b is input.

第１圧力制御器１５ａ，１５ｂは、前記ボイラ１ａ，１ｂの起動時には、前記ボイラ出口圧力調節ダンパ１４ａ，１４ｂを微開した後開スケジュールによって開作動し、この時前記ボイラ出口圧力計１６ａ，１６ｂによる圧力と煙突入口圧力計２０ａ，２０ｂによる圧力の差が無くなる（０になる）ように前記ボイラ出口圧力調節ダンパ１４ａ，１４ｂを制御し、ボイラ１ａ，１ｂの通常運転時には前記ボイラ出口圧力計１６ａ，１６ｂによる各ボイラ１ａ，１ｂの排ガスの圧力が所定の第１設定圧力（電気集塵器４ａ，４ｂの圧力損失を考慮して例えば−５０ｍｍＨ2Ｏ）に保持されるように前記ボイラ出口圧力調節ダンパ１４ａ，１４ｂを制御し、前記ボイラ１ａ，１ｂの停止時には、前記ボイラ出口圧力計１６ａ，１６ｂによる圧力と煙突入口圧力計２０ａ，２０ｂによる圧力の差が無くなる（０になる）ように制御し、その後、前記ボイラ出口圧力調節ダンパ１４ａ，１４ｂを微閉した後閉スケジュールによって閉作動するように前記ボイラ出口圧力調節ダンパ１４ａ，１４ｂを制御している。ここで、開スケジュールとは、起動時のボイラ出口圧力調節ダンパ１４ａ，１４ｂの開作動手順である。閉スケジュールとは、停止時のボイラ出口圧力調節ダンパ１４ａ，１４ｂの閉作動手順である。 When the boilers 1a and 1b are started, the first pressure controllers 15a and 15b are opened according to an opening schedule after the boiler outlet pressure adjusting dampers 14a and 14b are slightly opened. At this time, the boiler outlet pressure gauges 16a and 16b are operated. The boiler outlet pressure control dampers 14a and 14b are controlled so that there is no difference between the pressure due to the pressure and the pressure at the chimney inlet pressure gauges 20a and 20b (becomes 0). During normal operation of the boilers 1a and 1b, the boiler outlet pressure gauge 16a , 16b, the boiler outlet pressure so that the pressure of the exhaust gas of each boiler 1a, 1b is maintained at a predetermined first set pressure (for example, −50 mmH 2 O in consideration of the pressure loss of the electrostatic precipitators 4a, 4b). The control dampers 14a and 14b are controlled, and when the boilers 1a and 1b are stopped, the pressures of the boiler outlet pressure gauges 16a and 16b Control is performed such that the pressure difference between the inlet pressure gauges 20a and 20b is eliminated (becomes 0), and then the boiler outlet pressure adjusting dampers 14a and 14b are finely closed and then closed according to a closing schedule. The pressure control dampers 14a and 14b are controlled. Here, the opening schedule is a procedure for opening the boiler outlet pressure adjusting dampers 14a and 14b at the time of startup. The closing schedule is a closing operation procedure of the boiler outlet pressure adjusting dampers 14a and 14b at the time of stopping.

一方、前記各分岐流路１２ａ，１２ｂのブースタファン１０ａ，１０ｂの入口に誘引圧力調節ダンパ１７ａ，１７ｂを設け、該誘引圧力調節ダンパ１７ａ，１７ｂを制御する第２圧力制御器１８を設ける。該第２圧力制御器１８には、前記脱硫設備９入口に設けた脱硫入口圧力計１９で検出した圧力が入力されており、ボイラ１ａ，１ｂの通常運転時は前記脱硫設備９入口の排ガスの圧力が所定の第２設定圧力（例えば−１１０ｍｍＨ2Ｏ）に保持されるように前記誘引圧力調節ダンパ１７ａ，１７ｂを制御している。 On the other hand, attraction inlet pressure adjusting dampers 17a and 17b are provided at the inlets of the booster fans 10a and 10b of the branch passages 12a and 12b, and a second pressure controller 18 for controlling the attraction pressure adjusting dampers 17a and 17b is provided. The pressure detected by the desulfurization inlet pressure gauge 19 provided at the inlet of the desulfurization facility 9 is input to the second pressure controller 18, and the exhaust gas at the inlet of the desulfurization facility 9 is input during normal operation of the boilers 1 a and 1 b. The attraction pressure adjusting dampers 17a and 17b are controlled so that the pressure is maintained at a predetermined second set pressure (for example, −110 mmH 2 O).

なお、図１中、２１ａ，２１ｂは前記排ガスダクト３ａ，３ｂの電気集塵器４ａ，４ｂ出口に設けた開閉ダンパ、２２ａ，２２ｂはバイパスダクト１３ａ，１３ｂに設けた開閉ダンパ、５２ａ，５２ｂは分岐ダクト１２ａ，１２ｂにおける誘引圧力調節ダンパ１７ａ，１７ｂの入口に設けた開閉ダンパ、５３ａ，５３ｂは分岐ダクト１２ａ，１２ｂにおけるブースタファン１０ａ，１０ｂ出口に設けた開閉ダンパである。また、２３ａ，２３ｂは前記ボイラ出口圧力調節ダンパ１４ａ，１４ｂの入口に設けた排ガス流量計、２４は脱硫設備９の入口に設けた排ガス流量計である。   In FIG. 1, 21a and 21b are open / close dampers provided at the outlets of the electric dust collectors 4a and 4b of the exhaust gas ducts 3a and 3b, 22a and 22b are open / close dampers provided at the bypass ducts 13a and 13b, and 52a and 52b are Open / close dampers 53a and 53b provided at the inlets of the attractive pressure adjusting dampers 17a and 17b in the branch ducts 12a and 12b are open / close dampers provided at the outlets of the booster fans 10a and 10b in the branch ducts 12a and 12b. Further, 23a and 23b are exhaust gas flow meters provided at the inlets of the boiler outlet pressure control dampers 14a and 14b, and 24 is an exhaust gas flow meter provided at the inlet of the desulfurization facility 9.

図２は前記第１圧力制御器１５ａ，１５ｂの回路構成を示すブロック図であり、前記ボイラ出口圧力計１６ａ，１６ｂの検出圧力と、ボイラ負荷信号２５から関数発生器２６により作成した第１設定圧力２７（例えば−５０ｍｍＨ2Ｏ）を引算器２８に入力して引算し、該引算器２８による引算結果の偏差がなくなるようにＰＩコントローラ２９により前記ボイラ出口圧力調節ダンパ１４ａ，１４ｂの開度を制御しており、これにより通常運転時は、電気集塵器４ａ，４ｂ出口のボイラ排ガス圧力が常に第１設定圧力２７になるように制御される。図２中、３０は、排ガス流量計２３ａ，２３ｂからの電気集塵器４ａ，４ｂ出口の排ガス流量から関数発生器３１によって得たボイラ出口圧力調節ダンパ１４ａ，１４ｂの予定開度を、前記ＰＩコントローラ２９からの信号に先行的に加算する加算器である。更に、該加算器３０からの信号に対して、ボイラの起動開始時に微開Ｓ1信号を発しその後ボイラ負荷信号に基づく開スケジュールを発する開スケジュール信号３２を入力するよう切り替える切替器３３と、ボイラの停止開始時に微閉Ｓ2信号を発しその後ボイラ負荷信号に基づく閉スケジュールを発する閉スケジュール信号３４を入力するよう切り替える切替器３５と、ボイラ停止時に閉止（０％）信号３６を入力するよう切り替える切替器３７を備えている。 FIG. 2 is a block diagram showing the circuit configuration of the first pressure controllers 15a and 15b. The first setting created by the function generator 26 from the detected pressure of the boiler outlet pressure gauges 16a and 16b and the boiler load signal 25. The pressure 27 (for example, −50 mmH 2 O) is input to the subtractor 28 and subtracted. The PI controller 29 controls the boiler outlet pressure adjusting dampers 14a and 14b so that there is no deviation in the subtraction result of the subtractor 28. Thus, during normal operation, the boiler exhaust gas pressure at the outlets of the electrostatic precipitators 4a and 4b is controlled so as to always become the first set pressure 27. In FIG. 2, reference numeral 30 denotes a predetermined opening degree of the boiler outlet pressure adjusting dampers 14a and 14b obtained by the function generator 31 from the exhaust gas flow rates at the outlets of the electrostatic precipitators 4a and 4b from the exhaust gas flow meters 23a and 23b. This is an adder that adds to the signal from the controller 29 in advance. Furthermore, with respect to signals from the adder 30, a switch 33 for switching to enter the open schedule signal 32 then emits a BiHiraku S 1 signal upon starting the start-up of the boiler emits open schedule based on the boiler load signal, the boiler switch subsequent emit Bi閉S 2 signal to the stop at the start and switch 35 for switching to enter a closed schedule signal 34 that emits closing schedule based on the boiler load signal, it closed when the boiler is stopped (0%) to enter the signal 36 A switch 37 is provided.

又、前記関数発生器２６と前記引算器２８との間には、切替器５１が備えてあり、該切替器５１は、ボイラ1ａ，1ｂの起動、停止時に、前記煙突入口圧力計２０ａ，２０ｂからの圧力を前記第１設定圧力２７と切り替えて引算器４０に導くようにしている。   Further, a switch 51 is provided between the function generator 26 and the subtractor 28, and the switch 51 is configured so that the chimney inlet pressure gauge 20a, when the boilers 1a and 1b are started and stopped. The pressure from 20b is switched to the first set pressure 27 and led to the subtractor 40.

図３は前記の第２制御器１８の回路構成を示すブロック図であり、前記脱硫入口圧力計１９の検出圧力と、ボイラ負荷信号２５から関数発生器３８により作成した第２設定圧力３９（例えば−１１０ｍｍＨ2Ｏ）を引算器４０に入力して引算し、該引算器４０による引算結果の偏差がなくなるようにＰＩコントローラ４１により前記誘引圧力調節ダンパ１７ａ，１７ｂの開度を制御し、これにより通常運転時は、脱硫設備９入口の圧力を常に第２設定圧力３９に保持するようにしている。図３中、４２は排ガス圧力が所定範囲を超えて高く或いは低くなることを防止するための安全リミッタであり、また、４３は排ガス流量計２４からの脱硫設備９入口排ガス流量に基づいて関数発生器４４により得た誘引圧力調節ダンパ１７ａ，１７ｂの予定開度を、前記ＰＩコントローラ４１からの信号に先行的に加算する加算器である。更に、該加算器４３からの信号に対して、ボイラの起動開始時に微開信号４５Ｓ3を入力する切替器４６、ボイラの停止開始時に微閉信号４７Ｓ4を入力する切替器４８、及びボイラ停止時に閉止（０％）信号４９を入力する切替器５０を備えている。 FIG. 3 is a block diagram showing a circuit configuration of the second controller 18, and a second set pressure 39 (for example, a pressure generated by the function generator 38 from the detected pressure of the desulfurization inlet pressure gauge 19 and the boiler load signal 25). −110 mmH 2 O) is input to the subtractor 40 and subtracted, and the opening of the attraction pressure adjusting dampers 17a and 17b is controlled by the PI controller 41 so that the deviation of the subtraction result by the subtractor 40 is eliminated. Thus, during normal operation, the pressure at the inlet of the desulfurization facility 9 is always maintained at the second set pressure 39. In FIG. 3, 42 is a safety limiter for preventing the exhaust gas pressure from becoming higher or lower than a predetermined range, and 43 is a function generated based on the exhaust gas flow rate at the desulfurization facility 9 from the exhaust gas flow meter 24. This is an adder for adding the estimated opening degrees of the attractive pressure adjusting dampers 17a and 17b obtained by the device 44 to the signal from the PI controller 41 in advance. Further, a switch 46 for inputting a fine opening signal 45S 3 at the start of boiler startup, a switch 48 for inputting a fine close signal 47S 4 at the start of boiler stop, and a boiler stop for the signal from the adder 43. A switch 50 for inputting a closing (0%) signal 49 is sometimes provided.

次に、上記形態の作動を図１〜図３を参照しつつ説明する。   Next, the operation of the above embodiment will be described with reference to FIGS.

図１のボイラ１ａ，１ｂで排ガスを脱硫せずに排気できる低硫黄燃料（第２の燃料）を燃焼する場合には、開閉ダンパ２１ａ，２１ｂ、２２ａ，２２ｂは開け、開閉ダンパ５２ａ，５２ｂ，５３ａ，５３ｂは閉じ、ボイラ出口圧力調節ダンパ１４ａ，１４ｂは閉止し、脱硫設備９及びブースタファン１０ａ，１０ｂの運転は停止した状態においてボイラ１ａ，１ｂを運転する。この時、ボイラ１ａ，１ｂからの排ガスは脱硫設備９による圧力損失がないため、押込通風機２ａ，２ｂによる空気の押込みによりバイパスダクト１３ａ，１３ｂを通って煙突５ａ，５ｂに導かれる。   When burning low sulfur fuel (second fuel) that can be exhausted without desulfurizing exhaust gas in the boilers 1a and 1b of FIG. 1, the open / close dampers 21a, 21b, 22a, and 22b are opened and the open / close dampers 52a, 52b, The boilers 1a and 1b are operated in a state where the 53a and 53b are closed, the boiler outlet pressure adjusting dampers 14a and 14b are closed, and the operations of the desulfurization equipment 9 and the booster fans 10a and 10b are stopped. At this time, since the exhaust gas from the boilers 1a and 1b has no pressure loss due to the desulfurization equipment 9, it is led to the chimneys 5a and 5b through the bypass ducts 13a and 13b by the pushing-in of air by the pushing ventilators 2a and 2b.

次に、前記ボイラ１ａ，１ｂで排ガスの脱硫が必要な高硫黄燃料（第１の燃料）を燃焼する場合を、ボイラ１ａの場合を例にとって説明するが、ボイラ１ｂの場合も同様である。   Next, the case of burning high sulfur fuel (first fuel) that requires desulfurization of exhaust gas in the boilers 1a and 1b will be described by taking the case of the boiler 1a as an example, but the same applies to the case of the boiler 1b.

停止しているボイラ１ａを起動する際は、先ず、開閉ダンパ２１ａ，５２ａ，５３ａは開け、開閉ダンパ２２ａは閉じ、脱硫設備９及びブースタファン１０ａ，１０ｂは作動させた状態において、前記ボイラ出口圧力調節ダンパ１４ａを図２に示す如く開スケジュール信号３２により微開Ｓ1（例えば全開に対して１０％開）にすると共に、誘引圧力調節ダンパ１７ａを図３に示す如く微開信号４５により微開Ｓ3（例えば全開に対して１０％開）にした後、ボイラ１ａに押込通風機２ａによる空気とオルマリジョン等の高硫黄燃料とを供給して燃焼させることによりボイラ１ａを起動する。これにより、ボイラ１ａからの排ガスは、排ガスダクト３ａの微開のボイラ出口圧力調整ダンパ１４ａ、合流ダクト１１の脱硫設備９、分岐ダクト１２ａの微開の誘引圧力調節ダンパ１７ａを介しブースタファン１０ａにより吸引されて煙突５ａに導かれる。 When starting the stopped boiler 1a, first, the opening / closing dampers 21a, 52a, 53a are opened, the opening / closing damper 22a is closed, and the desulfurization equipment 9 and the booster fans 10a, 10b are operated. the adjusting damper 14a by opening schedule signal 32 as shown in FIG. 2 while the BiHiraku S 1 (e.g. 10% open relative to fully open), the attraction pressure adjustment damper 17a by BiHiraku signal 45 as shown in FIG. 3 BiHiraku after the S 3 (e.g., 10% relative fully opened opening), by supplying a high-sulfur fuel, such as air and Orumarijon by forced draft fan 2a in the boiler 1a to start the boiler 1a by burning. As a result, the exhaust gas from the boiler 1a is sent by the booster fan 10a through the finely opened boiler outlet pressure adjusting damper 14a of the exhaust gas duct 3a, the desulfurization equipment 9 of the merging duct 11, and the finely induced pressure adjusting damper 17a of the branch duct 12a. It is sucked and guided to the chimney 5a.

ボイラ出口圧力計１６ａで検出されるボイラ１ａからの排ガス圧力が安定した後、ボイラ１ａの負荷を増加すると共に、図２に示す如くボイラ負荷信号２５に基づく開スケジュール信号３２の開スケジュールに従ってボイラ出口圧力調節ダンパ１４ａを開作動する。その後、ボイラ出口圧力計１６ａによるボイラ１ａ出口の圧力と、煙突入口圧力計２０ａによる煙突５ａ入口の圧力の差（差圧）が無くなるようにボイラ出口圧力調節ダンパ１５ａの開度を制御する。   After the exhaust gas pressure from the boiler 1a detected by the boiler outlet pressure gauge 16a is stabilized, the load on the boiler 1a is increased, and the boiler outlet according to the open schedule of the open schedule signal 32 based on the boiler load signal 25 as shown in FIG. The pressure adjusting damper 14a is opened. Thereafter, the opening degree of the boiler outlet pressure adjusting damper 15a is controlled so that the difference (differential pressure) between the pressure at the boiler 1a outlet by the boiler outlet pressure gauge 16a and the pressure at the chimney inlet 5a by the chimney inlet pressure gauge 20a is eliminated.

上記したように、ボイラ起動時に、ボイラ１ａ出口と煙突５ａ入口の差圧０の制御が行われることにより、排ガスがバイパスダクト1３ａを逆流するようなことが防止され、ボイラ１ａ出口の排ガス圧力は安定するので、ボイラ起動時にボイラ１ａが失火するような問題を防止することができる。   As described above, by controlling the differential pressure 0 between the boiler 1a outlet and the chimney 5a inlet at the start of the boiler, the exhaust gas is prevented from flowing back through the bypass duct 13a, and the exhaust gas pressure at the boiler 1a outlet is Since it stabilizes, the problem that the boiler 1a misfires at the time of boiler starting can be prevented.

ボイラ１ａの起動が終了すると通常運転に移行するが、通常運転時は図２のボイラ負荷信号２５に基づいて関数発生器２６により作成した第１設定圧力２７（図２の場合は−５０ｍｍＨ2Ｏ）が引算器２８に入力されてボイラ出口圧力計１６ａからの信号と引算され、該引算器２８による引算結果の偏差がなくなるようにＰＩコントローラ２９から出される信号により前記ボイラ出口圧力調節ダンパ１４ａの開度が制御され、これによってボイラ出口の排ガス圧力が安定される。これと同時に、ボイラ負荷信号２５に基づいて図３の関数発生器３８により作成した第２設定圧力３９（図３の場合は−１１０ｍｍＨ2Ｏ）が引算器４０に入力されて脱硫入口圧力計１９からの信号と引算され、該引算器４０による引算結果の偏差がなくなるようにＰＩコントローラ４１から出される信号により前記誘引圧力調節ダンパ１７ａの開度が制御される。これにより脱硫設備９入口の排ガス圧力が安定される。 When the startup of the boiler 1a is completed, the operation is shifted to the normal operation. During the normal operation, the first set pressure 27 (-50 mmH 2 O in the case of FIG. 2) created by the function generator 26 based on the boiler load signal 25 of FIG. ) Is input to the subtractor 28 and subtracted from the signal from the boiler outlet pressure gauge 16a, and the boiler outlet pressure is determined by a signal output from the PI controller 29 so that there is no deviation in the subtraction result by the subtractor 28. The opening degree of the adjustment damper 14a is controlled, thereby stabilizing the exhaust gas pressure at the boiler outlet. At the same time, the second set pressure 39 (-110 mmH 2 O in the case of FIG. 3) created by the function generator 38 of FIG. 3 based on the boiler load signal 25 is input to the subtractor 40 and desulfurization inlet pressure gauge. 19 and the opening degree of the attraction pressure adjusting damper 17a is controlled by a signal output from the PI controller 41 so that there is no deviation in the subtraction result by the subtractor 40. Thereby, the exhaust gas pressure at the inlet of the desulfurization facility 9 is stabilized.

ボイラ１ａの停止時は、先ず、ボイラ出口圧力計１６ａによるボイラ１ａ出口の圧力と、煙突入口圧力計２０ａによる煙突５ａ入口の圧力の差（差圧）が無くなるようにボイラ出口圧力調節ダンパ１４ａの開度を制御する。   When the boiler 1a is stopped, first, the boiler outlet pressure adjusting damper 14a is set so that there is no difference (differential pressure) between the pressure at the boiler outlet 1a by the boiler outlet pressure gauge 16a and the pressure at the chimney inlet 5a by the chimney inlet pressure gauge 20a. Control the opening.

この状態でボイラ出口圧力計１６ａで検出されるボイラ１ａの排ガスの圧力が安定した後、ボイラ負荷を減少させると共に、図２に示す如くボイラ負荷信号２５に基づく閉スケジュール信号３４の閉スケジュールに従ってボイラ出口圧力調節ダンパ１４ａを閉作動する。   In this state, after the pressure of the exhaust gas of the boiler 1a detected by the boiler outlet pressure gauge 16a is stabilized, the boiler load is reduced and the boiler is closed according to the closing schedule of the closing schedule signal 34 based on the boiler load signal 25 as shown in FIG. The outlet pressure adjusting damper 14a is closed.

上記したように、ボイラ停止時も、ボイラ１ａ出口と煙突５ａ入口の差圧０の制御が行われることにより、排ガスがバイパスダクト1３ａを逆流するようなことが防止され、ボイラ１ａ出口の排ガス圧力は安定するので、ボイラ起動時にボイラ１ａが失火するような問題を防止することができる。   As described above, even when the boiler is stopped, by controlling the differential pressure 0 between the boiler 1a outlet and the chimney 5a inlet, the exhaust gas is prevented from flowing back through the bypass duct 13a, and the exhaust gas pressure at the boiler 1a outlet is prevented. Can stabilize the problem that the boiler 1a misfires when the boiler is started.

ボイラ１ａ負荷が減少して停止し、又はバイバスダクト１３ａを通って排ガスが煙突に導かれた後、ボイラ出口圧力調節ダンパ１４ａが全閉し、その後当該ボイラ１ａに対応するブースタファン１０ａの運転を停止する。このように停止したボイラ１ａは、他のボイラ１ｂに対する影響及び排ガスの逆流を防止するために、開閉ダンパ５２ａ，５３ａを閉止する。   After the boiler 1a load decreases and stops or exhaust gas is guided to the chimney through the bypass duct 13a, the boiler outlet pressure adjusting damper 14a is fully closed, and then the booster fan 10a corresponding to the boiler 1a is operated. Stop. The boiler 1a stopped in this way closes the open / close dampers 52a and 53a in order to prevent the influence on the other boiler 1b and the backflow of the exhaust gas.

また、前記したボイラ１ａが運転されている状態において、別のボイラ１ｂを起動或いは停止する際は、前記ボイラ１ａ出口の排ガス圧力が第１圧力制御器１５ａによって第１設定圧力２７に保持され、且つ脱硫設備９の入口圧力が第２圧力制御器１８によって第２設定圧力に保持されているため、別のボイラ１ｂを前記と同様にして起動或いは停止しても、運転しているボイラ１ａに対して悪い影響を与えることはない。   Further, when the above-described boiler 1a is in operation, when starting or stopping another boiler 1b, the exhaust gas pressure at the outlet of the boiler 1a is held at the first set pressure 27 by the first pressure controller 15a, In addition, since the inlet pressure of the desulfurization facility 9 is maintained at the second set pressure by the second pressure controller 18, even if another boiler 1b is started or stopped in the same manner as described above, the operating boiler 1a There is no negative impact on it.

更に、前記ボイラ１ａ，１ｂによって高硫黄燃料でありしかも着火・燃焼性が悪い燃料を燃焼する場合には、起動時は燃焼性の良い低硫黄燃料を燃焼させて排ガスをバイパスダクト１３ａ，１３ｂに流すようにし、ボイラ１ａ，１ｂが十分に加熱された後に高硫黄燃料に切り換えて燃焼し排ガスを脱硫設備９に導くようにすることができる。   Further, when the high-sulfur fuel is burned by the boilers 1a and 1b and the ignition / combustibility is poor, the low-sulfur fuel having good combustibility is combusted at the start-up, and the exhaust gas is passed to the bypass ducts 13a and 13b. After the boilers 1a and 1b are sufficiently heated, the high-sulfur fuel is switched over and burned to guide the exhaust gas to the desulfurization facility 9.

なお、本発明のボイラ通風圧力制御装置及びその運転方法は、上記形態にのみ限定されるものではなく、図１では２基のボイラを備えた場合について説明したが３基以上のボイラを備えた多缶ボイラにも適用できること、その他、本発明の要旨を逸脱しない範囲内において種々変更を加え得ることは勿論である。   In addition, the boiler ventilation pressure control apparatus of this invention and its operating method are not limited only to the said form, Although FIG. 1 demonstrated the case where it provided with two boilers, it was equipped with three or more boilers. Needless to say, the present invention can be applied to a multi-can boiler, and various modifications can be made without departing from the scope of the present invention.

１ａ，１ｂ ボイラ
３ａ，３ｂ 排ガスダクト
５ａ，５ｂ 煙突
９ 脱硫設備
１０ａ，１０ｂ ブースタファン
１１ 合流ダクト
１２ａ，１２ｂ 分岐ダクト
１３ａ，１３ｂ バイパスダクト
１４ａ，１４ｂ ボイラ出口圧力調節ダンパ
１５ａ，１５ｂ 第１圧力制御器
１６ａ，１６ｂ ボイラ出口圧力計
１７ａ，１７ｂ 誘引圧力調節ダンパ
１８ 第２圧力制御器
１９ 脱硫入口圧力計
２０ａ，２０ｂ 煙突入口圧力計
２１ａ，２１ｂ 開閉ダンパ
２２ａ，２２ｂ 開閉ダンパ
２７ 第１設定圧力
３２ 開スケジュール信号
３４ 閉スケジュール信号
３９ 第２設定圧力
５２ａ，５２ｂ 開閉ダンパ
５３ａ，５３ｂ 開閉ダンパ 1a, 1b Boiler 3a, 3b Exhaust gas duct 5a, 5b Chimney 9 Desulfurization equipment 10a, 10b Booster fan 11 Junction duct 12a, 12b Branch duct 13a, 13b Bypass duct 14a, 14b Boiler outlet pressure control damper 15a, 15b First pressure controller 16a, 16b Boiler outlet pressure gauges 17a, 17b Attraction pressure adjustment damper 18 Second pressure controller 19 Desulfurization inlet pressure gauge 20a, 20b Chimney inlet pressure gauges 21a, 21b Open / close dampers 22a, 22b Open / close dampers 27 First set pressure 32 Open schedule Signal 34 Closing schedule signal 39 Second set pressure 52a, 52b Open / close damper 53a, 53b Open / close damper

Claims (3)

第１の燃料と第１の燃料より硫黄成分が少ない第２の燃料とを切り替えて燃焼する複数のボイラを有し該各ボイラからの排ガスを対応した複数の煙突に導く多缶ボイラの前記各ボイラからの排ガスを１つの脱硫設備により脱硫するようにしたボイラ通風圧力制御装置であって、
前記各ボイラの排ガスダクトを統合する合流ダクトと、
該合流ダクトに備えた１つの脱硫設備と、
該脱硫設備出口の排ガスを分岐して前記各煙突に導く分岐ダクトと、
該各分岐ダクトに備えたブースタファンと、
前記各排ガスダクトと各分岐ダクトの煙突入口とを連通するバイパスダクトと、
前記各排ガスダクトのバイパスダクト接続部下流に備えたボイラ出口圧力調節ダンパと、
前記ボイラの起動時は前記ボイラ出口圧力調節ダンパを微開した後開スケジュールにより開作動すると共に、この時のボイラ出口と煙突入口の差圧が無くなるようにボイラ出口圧力調節ダンパの開度を制御し、ボイラの通常運転時は前記各ボイラ出口の圧力が第１設定圧力に保持されるように前記ボイラ出口圧力調節ダンパを制御し、ボイラの停止時は前記ボイラ出口圧力調節ダンパをボイラ出口と煙突入口の差圧が無くなるように制御し、その後、閉スケジュールにより閉作動するように前記ボイラ出口圧力調節ダンパを制御する第１圧力制御器と、
前記各分岐流路のブースタファン入口に備えた誘引圧力調節ダンパと、
前記ボイラの通常運転時に前記脱硫設備入口の圧力が第２設定圧力に保持されるように前記誘引圧力調節ダンパを制御する第２圧力制御器と、
を備えたことを特徴とするボイラ通風圧力制御装置。 Each of the multi-can boilers having a plurality of boilers that switch between a first fuel and a second fuel that has a lower sulfur component than the first fuel and that burns the exhaust gas from each boiler to a corresponding plurality of chimneys A boiler ventilation pressure control device configured to desulfurize exhaust gas from a boiler with a single desulfurization facility,
A merging duct for integrating the exhaust gas ducts of the boilers;
One desulfurization facility provided in the junction duct;
A branch duct for branching the exhaust gas at the outlet of the desulfurization equipment and leading it to each chimney;
A booster fan provided for each branch duct;
A bypass duct communicating the exhaust gas duct and the chimney inlet of each branch duct;
A boiler outlet pressure adjusting damper provided downstream of the bypass duct connecting portion of each exhaust gas duct;
When the boiler is started, the boiler outlet pressure adjustment damper is opened slightly and then opened according to the opening schedule. At the same time, the opening degree of the boiler outlet pressure adjustment damper is controlled so that the differential pressure between the boiler outlet and the chimney inlet is eliminated. The boiler outlet pressure adjusting damper is controlled so that the pressure at each boiler outlet is maintained at the first set pressure during normal operation of the boiler, and the boiler outlet pressure adjusting damper is used as the boiler outlet when the boiler is stopped. A first pressure controller for controlling the boiler outlet pressure adjusting damper so as to eliminate the differential pressure at the chimney inlet, and then to close according to a closing schedule;
An attraction pressure adjusting damper provided at the booster fan inlet of each branch passage;
A second pressure controller for controlling the attraction pressure adjusting damper so that the pressure at the desulfurization facility inlet is maintained at a second set pressure during normal operation of the boiler;
A boiler ventilation pressure control device comprising: 前記排ガスダクトと分岐ダクトとバイパスダクトの夫々に開閉ダンパを備えたことを特徴とする請求項１に記載のボイラ通風圧力制御装置。   The boiler ventilation pressure control device according to claim 1, wherein an open / close damper is provided in each of the exhaust gas duct, the branch duct, and the bypass duct. 前記請求項１又は２に記載のボイラ通風圧力制御装置の運転方法であって、
ボイラで低硫黄燃料を燃焼する際の排ガスはバイパスダクトに導くようにし、
一方、ボイラで高硫黄燃料を燃焼する際のボイラの起動時は、先ず脱硫設備及び当該ボイラに対応したブースタファンを運転し、前記ボイラ出口圧力調節ダンパと誘引圧力調節ダンパを微開にした後当該ボイラを駆動し、ボイラ排ガス圧力が安定した後、ボイラ負荷の増加に伴いボイラ出口圧力調節ダンパを開スケジュールにより開作動すると共に、この時のボイラ出口と煙突入口の差圧が無くなるようにボイラ出口圧力調節ダンパの開度を制御し、
ボイラの通常運転時は、前記各ボイラからの排ガス圧力が第１設定圧力に保持されるように前記ボイラ出口圧力調節ダンパを制御すると共に、前記脱硫設備入口の排ガス圧力が第２設定圧力に保持されるように前記誘引圧力調節ダンパを制御し、
ボイラの停止時は、当該ボイラの出力を低下させると共に前記ボイラ出口圧力調節ダンパと誘引圧力調節ダンパを微閉にして排ガス圧力が安定した後、ボイラ出口と煙突入口の差圧が無くなるように制御し、その後、閉スケジュールにより閉作動するようにボイラ出口圧力調節ダンパを制御し、当該ボイラが停止しボイラ出口圧力調節ダンパが全閉したら当該ボイラに対応したブースタファンの運転を停止する
ことを特徴とするボイラ通風圧力制御装置の運転方法。 An operation method of the boiler ventilation pressure control device according to claim 1 or 2,
The exhaust gas when burning low-sulfur fuel in the boiler is led to the bypass duct,
On the other hand, when starting up the boiler when burning high-sulfur fuel in the boiler, first, the desulfurization equipment and the booster fan corresponding to the boiler are operated, and the boiler outlet pressure adjustment damper and the attractive pressure adjustment damper are opened slightly. After the boiler exhaust gas pressure is stabilized and the boiler exhaust gas pressure is stabilized, the boiler outlet pressure adjustment damper is opened according to the opening schedule as the boiler load increases, and the boiler outlet pressure and the chimney inlet at this time are eliminated. Control the opening of the outlet pressure adjustment damper,
During normal operation of the boiler, the boiler outlet pressure adjustment damper is controlled so that the exhaust gas pressure from each boiler is held at the first set pressure, and the exhaust gas pressure at the desulfurization facility inlet is held at the second set pressure. Controlling the attraction pressure adjustment damper to be
When the boiler is stopped, the output of the boiler is reduced and the boiler outlet pressure adjustment damper and the attractive pressure adjustment damper are finely closed to stabilize the exhaust gas pressure, and control is performed so that the differential pressure between the boiler outlet and the chimney inlet disappears. Then, the boiler outlet pressure adjustment damper is controlled so as to be closed according to the closing schedule, and when the boiler stops and the boiler outlet pressure adjustment damper is fully closed, the operation of the booster fan corresponding to the boiler is stopped. The operation method of the boiler ventilation pressure control device.
JP2009296789A 2009-12-28 2009-12-28 Boiler ventilation pressure control device and operation method thereof Active JP5402624B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2009296789A JP5402624B2 (en) 2009-12-28 2009-12-28 Boiler ventilation pressure control device and operation method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2009296789A JP5402624B2 (en) 2009-12-28 2009-12-28 Boiler ventilation pressure control device and operation method thereof

Publications (2)

Publication Number Publication Date
JP2011137574A JP2011137574A (en) 2011-07-14
JP5402624B2 true JP5402624B2 (en) 2014-01-29

Family

ID=44349151

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2009296789A Active JP5402624B2 (en) 2009-12-28 2009-12-28 Boiler ventilation pressure control device and operation method thereof

Country Status (1)

Country Link
JP (1) JP5402624B2 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6537987B2 (en) * 2016-02-01 2019-07-03 住友重機械工業株式会社 Combustion control system and combustion control method
CN107551790A (en) * 2017-09-29 2018-01-09 江苏亿金环保科技有限公司 A kind of urgent bypass protection system of boiler flue gas desulfurization EGR
US11236907B2 (en) * 2018-02-20 2022-02-01 Mitsubishi Heavy Industries Engineering, Ltd. Exhaust gas treatment device and exhaust gas treatment method
CN112460576A (en) * 2020-11-23 2021-03-09 西安热工研究院有限公司 Boiler smoke and air system suitable for deep peak regulation and peak regulation method

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3575500B2 (en) * 1995-06-02 2004-10-13 石川島播磨重工業株式会社 Gas flow control device for desulfurizer
JP3539918B2 (en) * 2000-08-07 2004-07-07 川崎重工業株式会社 Smoke exhaust treatment method for ash melting boiler equipment with dust collector and ash melting boiler equipment
JP4133231B2 (en) * 2002-11-05 2008-08-13 バブコック日立株式会社 Smoke removal equipment

Also Published As

Publication number Publication date
JP2011137574A (en) 2011-07-14

Similar Documents

Publication Publication Date Title
JP5774381B2 (en) Waste heat recovery boiler and power plant
JP5402624B2 (en) Boiler ventilation pressure control device and operation method thereof
JP2007232262A (en) Cogeneration plant and its operating method
JP5487593B2 (en) Coke oven flue dust collector startup method
CN103321751A (en) Method for meeting a purge flow requirement for a power plant and a power plant having a purge control system
JP6616945B2 (en) Incineration plant
JP5487509B2 (en) Boiler combustion system and its operating method
JP4859512B2 (en) Combustion boiler control method
KR101842772B1 (en) Hybrid power unit
JP2014005971A (en) Boiler
JP7054094B2 (en) Combustion control method, waste incinerator power generation equipment
JP2005147558A (en) Boiler performing low combustion by small-capacity burner
JP6246709B2 (en) Combustion burner and boiler
JP4605656B2 (en) Thermal power generation boiler and combustion air supply control method
JP2002106831A (en) Pulverized coal fired boiler facility
JP2009144937A (en) Operating method of boiler
JPH09236201A (en) Method and device for controlling forced-draft blower for boiler
JP4343037B2 (en) Hot air generator
JP2900283B2 (en) Control method of exhaust gas ventilator of flue gas desulfurization unit
JP5968028B2 (en) Boiler combustion equipment
JP2007024425A (en) Composite boiler system, and its operating method
JP2006145158A (en) Intake air temperature control method and device for indoor boiler
JPH08121749A (en) Ventilating pressure controller for ventilating line for combined multiboilers
JP3159737B2 (en) Control unit for desulfurization unit
JP4206617B2 (en) Desulfurization ventilator control method for boiler plant

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20121025

TRDD Decision of grant or rejection written
A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20130930

A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20131001

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20131014

R151 Written notification of patent or utility model registration

Ref document number: 5402624

Country of ref document: JP

Free format text: JAPANESE INTERMEDIATE CODE: R151

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250