JP3258998B2 - Operation control method for cogeneration system - Google Patents

Operation control method for cogeneration system

Info

Publication number
JP3258998B2
JP3258998B2 JP21416692A JP21416692A JP3258998B2 JP 3258998 B2 JP3258998 B2 JP 3258998B2 JP 21416692 A JP21416692 A JP 21416692A JP 21416692 A JP21416692 A JP 21416692A JP 3258998 B2 JP3258998 B2 JP 3258998B2
Authority
JP
Japan
Prior art keywords
heat
thermoelectric
demand
cogeneration system
storage tank
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.)
Expired - Fee Related
Application number
JP21416692A
Other languages
Japanese (ja)
Other versions
JPH0659747A (en
Inventor
政義 佐藤
文雄 松岡
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.)
Mitsubishi Electric Corp
East Japan Railway Co
Original Assignee
Mitsubishi Electric Corp
East Japan Railway Co
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 Mitsubishi Electric Corp, East Japan Railway Co filed Critical Mitsubishi Electric Corp
Priority to JP21416692A priority Critical patent/JP3258998B2/en
Publication of JPH0659747A publication Critical patent/JPH0659747A/en
Application granted granted Critical
Publication of JP3258998B2 publication Critical patent/JP3258998B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/14—Thermal energy storage
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P80/00—Climate change mitigation technologies for sector-wide applications
    • Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
    • Y02P80/15—On-site combined power, heat or cool generation or distribution, e.g. combined heat and power [CHP] supply

Landscapes

  • Control Of Temperature (AREA)
  • Control Of Steam Boilers And Waste-Gas Boilers (AREA)
  • Supply And Distribution Of Alternating Current (AREA)
  • Feedback Control In General (AREA)

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【０００１】[0001]

【産業上の利用分野】本発明は、エンジン駆動コジェネ
レーションシステムとヒートポンプ及び蓄熱槽とを組み
合わせた熱電併給システムにおけるコジェネレーション
システムの運転制御方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling the operation of a cogeneration system in a cogeneration system combining an engine-driven cogeneration system with a heat pump and a heat storage tank.

【０００２】[0002]

【従来の技術】図３は例えば「コジェネレーション」
（Ｖｏｌ．４，Ｎｏ２，１９８９，Ｐ２５〜Ｐ３０）に
示された従来のコジェネレーション・システムにおける
蓄熱槽の最適運用を示すシステム図であり、図におい
て、ＤＧはディゼルエンジン発電機、ＲＥは電動ターボ
冷凍機、ＲＷは温水吸収冷凍機、ＢＡは温水ボイラ、Ｒ
Ａは油焚冷暖房機、ＰＣ，ＰＤ，ＰＨ，ＰＴ，ＰＷは各
種ポンプ、ＣＴは冷却塔、ＳＴは蓄熱槽である。2. Description of the Related Art FIG.
(Vol. 4, No. 2, 1989, P25 to P30) is a system diagram showing the optimal operation of the heat storage tank in the conventional cogeneration system, in which DG is a diesel engine generator and RE is an electric turbocharger. Refrigerator, RW is hot water absorption refrigerator, BA is hot water boiler, R
A is an oil-fired cooling / heating machine, PC, PD, PH, PT, and PW are various pumps, CT is a cooling tower, and ST is a heat storage tank.

【０００３】次に動作について説明する。図３中、二点
鎖線は燃料の流れを示し、Ａ重油はディゼルエンジン発
電機ＤＧと温水ボイラＢＡと油焚冷暖房機ＲＡとに投入
される。ディゼルエンジン発電機ＤＧで電力を発生し、
排熱が回収されて蓄熱槽ＳＴに蓄えられる。また、蓄熱
槽内の温水を使って温水吸収冷凍機ＲＷで冷水が得られ
冷房需要を賄う。さらに、蓄熱槽ＳＴの温水が暖房需要
と給湯需要に供される。それでも余る場合は、冷却塔Ｃ
Ｔで余剰熱は捨てられる。暖房需要と給湯需要に応じ切
れない時は、上記油焚冷房機ＲＡと温水がボイラＢＡと
から供給され、冷房需要に対しては、上記油焚冷暖房機
ＲＡと電動ターボ冷凍機ＲＥにより賄われる。Next, the operation will be described. In FIG. 3, the two-dot chain line indicates the flow of the fuel, and the heavy oil A is supplied to the diesel engine generator DG, the hot water boiler BA, and the oil fired cooling / heating machine RA. Generate electricity with the diesel engine generator DG,
Exhausted heat is collected and stored in the heat storage tank ST. In addition, cold water is obtained by the hot water absorption refrigerator RW using the hot water in the heat storage tank to cover the cooling demand. Further, the hot water in the heat storage tank ST is used for heating demand and hot water supply demand. If there is still room for cooling tower C
At T, excess heat is discarded. When the heating demand and the hot water supply demand cannot be satisfied, the oil-fired cooling machine RA and the hot water are supplied from the boiler BA, and the cooling demand is covered by the oil-fired cooling / heating machine RA and the electric turbo chiller RE. .

【０００４】[0004]

【発明が解決しようとする課題】従来のコジェネレーシ
ョンシステムにおける蓄熱槽の運転方法は、以上のよう
に構成されているので、負荷側と熱源側のつなぎとして
の機能を果たしているのではなく、コジェネレーション
システムのみの緩衝機能でしかありえず、他の熱源機を
も含めた熱源機群の選択に寄与してないという欠点があ
り、さらに、故障時などのバックアップ体制が考慮され
ていないので、制御が複雑で信頼性に乏しく、買電との
制御の組合せが明確でないという問題点があった。The operation method of the heat storage tank in the conventional cogeneration system is configured as described above, so that it does not function as a connection between the load side and the heat source side, but the There is a drawback that it can only be a buffer function of the generation system only and does not contribute to the selection of heat source equipment group including other heat source equipment.Furthermore, since the backup system in case of failure etc. is not considered, control However, there is a problem in that the control is complicated and the reliability is poor, and the control combination with the power purchase is not clear.

【０００５】本発明は、上記のような問題点を解消する
ためになされたもので、負荷側と熱源側の中間に蓄熱槽
を配し、両者のつなぎとしての機能を果たし、熱源機群
全体の能力制御を実行でき、熱源機種の選択、故障時の
バックアップ等簡単な制御で負荷側の需要に応ずること
が可能なコジェネレーションシステムの運転制御方法を
提供することを目的とする。SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems. A heat storage tank is provided between a load side and a heat source side, and functions as a connection between the two. It is an object of the present invention to provide an operation control method of a cogeneration system which can execute the capacity control of the cogeneration system and can respond to the demand on the load side by a simple control such as selection of a heat source model and backup in case of a failure.

【０００６】[0006]

【課題を解決するための手段】本発明に係るコジェネレ
ーションシステムの運転制御方法は、エンジン駆動コジ
ェネレーションシステムとヒートポンプ及び蓄熱槽とを
組み合わせた熱電併給システムにおいて、コジェネレー
ションシステムにおける熱電発生比率に対し、需要側熱
電比率が小さい時は、電力需要に合わせてコジェネレー
ションシステムを運転し、余剰熱を蓄熱槽に蓄熱し、需
要側熱電比率が大きい時は、所望熱電需要量から蓄熱槽
からの利用熱量を差し引いたみなし熱需要量を求め、上
記みなし熱需要量と所望電力需要量とから成る熱電需要
点を求め、上記コジェネレーションシステムの熱電発生
図中の上記熱電需要点を通り傾きが成績係数の逆数とな
る熱電実現直線と上記コジェネレーションシステムの熱
電発生図中の熱電発生直線の上に買電直線を重ねた熱電
供給線を作成し、上記熱電実現直線と上記熱電供給線と
の交点で上記コジェネレーションシステムとヒートポン
プを運転するものである。SUMMARY OF THE INVENTION An operation control method for a cogeneration system according to the present invention is directed to a cogeneration system combining an engine-driven cogeneration system, a heat pump and a heat storage tank. When the demand-side heat-to-power ratio is low, the cogeneration system is operated according to the power demand, and the surplus heat is stored in the heat storage tank. The deemed heat demand amount obtained by subtracting the heat amount is obtained, the thermoelectric demand point composed of the above deemed heat demand amount and the desired power demand amount is obtained, and the slope passing through the thermoelectric demand point in the thermoelectric generation diagram of the cogeneration system is a coefficient of performance. Thermoelectric realization line, which is the reciprocal of Create a thermoelectric supply line of extensive power purchase straight on raw linear, in which operating the cogeneration system and the heat pump at the intersection between the thermoelectric realized line and the thermoelectric supply line.

【０００７】[0007]

【作用】本発明においては、エンジン駆動コジェネレー
ションシステムとヒートポンプ及び蓄熱槽を組み合わせ
た熱電併給システムにおいて、蓄熱槽を介して負荷側と
熱源側に分離し、熱電負荷比が小さい時は、コジェネレ
ーションシステムのみを運転し余剰熱を蓄熱槽内に蓄熱
し、熱電負荷比が大の時は、一部の熱を蓄熱槽からの熱
で賄いつつ、残りの熱電負荷量に対し、コジェネレーシ
ョンシステムとヒートポンプで熱電供給線と熱電実現直
線の交点で運転する。According to the present invention, in a cogeneration system combining an engine-driven cogeneration system with a heat pump and a heat storage tank, the heat and power is separated into a load side and a heat source side via a heat storage tank. Only the system is operated to store excess heat in the heat storage tank, and when the thermoelectric load ratio is high, a part of the heat is supplied from the heat storage tank while the remaining heat and power load is The heat pump operates at the intersection of the thermoelectric supply line and the thermoelectric realization line.

【０００８】[0008]

【実施例】以下、本発明の一実施例を図について説明す
る。図１において、ＣＧＳはエンジン駆動コジェネレー
ションシステム、Ｈはヒートポンプ、ＷL は電力負荷、
ＱL は熱負荷、ＳＴは蓄熱槽、θSTは蓄熱槽内温度レベ
ル、ＰC ，ＰH ，ＰL はそれぞれポンプ、ＶC ，ＶH ，
ＶL はそれぞれ三方弁、ＷA は補機電力、ＷB は買電で
ある。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. In Figure 1, CGS engine driven cogeneration system, H is the heat pump, W L is the power load,
Q L is the heat load, ST is the heat storage tank, θ ST is the temperature level in the heat storage tank, P C , P H , and P L are pumps, V C , V H ,
V L each three-way valve, W A is auxiliary power, W B is the purchase of electricity.

【０００９】また、図２はエンジン駆動コジェネレーシ
ョンシステムＣＧＳの熱電発生図であり、横軸Ｑh は熱
発生量、縦軸Ｗは電力発生量、ａは熱電発生直線、Ｘ
1 ，Ｘ2 は熱電負荷需要点、Ｙ1 ，Ｙ2 ’’はコジェネ
レーションシステムのそれぞれの運転点を示す。ＱST1
は発生熱が余ることを示し、ＱST2 は蓄熱槽からの採取
熱量を示している。また、買電直線はｂであり、ａ＋ｂ
の折れ線全体が熱電供給線である。[0009] FIG. 2 is a thermoelectric generation view of an engine-driven cogeneration system CGS, the abscissa Q h is the heat generation amount, and the vertical axis W is power generation amount, a is thermoelectric generating linear, X
1 , X 2 indicates a thermoelectric load demand point, and Y 1 , Y 2 ″ indicate respective operating points of the cogeneration system. Q ST1
Represents surplus generated heat, and Q ST2 represents the amount of heat collected from the heat storage tank. The power purchase straight line is b, and a + b
Is a thermoelectric supply line.

【００１０】図１に示すように、蓄熱槽ＳＴを介して、
負荷側と熱源機群側とに分離されて構成される。蓄熱槽
ＳＴ内は左端が高温槽で右端が低温槽になるように構成
されている。熱負荷ＱL 側には定流量ポンプＰL に三方
弁ＶL を介して任意の温水が作れるようになっている。
熱源機側はコジェネレーションシステムＣＧＳとヒート
ポンプＨが並列に接続されており、それぞれ定流ポンプ
ＰC とＰH が各々三方弁ＶC とＶH を介して接続され、
出口水温が一定の高温になるように制御されている。As shown in FIG. 1, through a heat storage tank ST,
The load side and the heat source device group side are configured separately. In the heat storage tank ST, the left end is a high-temperature tank and the right end is a low-temperature tank. The heat load Q L side so make any hot water through the three-way valve V L to the constant flow rate pump P L.
Heat source apparatus side cogeneration are systems CGS and heat pump H are connected in parallel, each constant flow pump P C and P H are connected via the respective three-way valve V C and V H,
The outlet water temperature is controlled to be constant.

【００１１】従って、図２の熱電負荷比の小さいＸ1 の
需要に対し、コジェネレーションシステムＣＧＳは電力
負荷ＷL に追従したＹ1 で運転し、余剰熱ＱST1 は蓄熱
槽内ＳＴに蓄えられる。一方、熱電負荷比の大きいＸ2
＝ＱL ／ＷL の時は、熱負荷の一部ＱST2 を蓄熱槽ＳＴ
からの放熱で賄うため、コジェネレーションシステムに
必要とされるみなし熱需要量はＱh ’となり、必要な熱
電需要点はＸ2 ’となる。熱電需要点Ｘ2 ’を通り傾き
が１／ＣＯＰとなる直線ｌと熱電発生直線ａ＋ｂとの交
点Ｙ2 ’がコジェネレーションシステム＋買電の運転点
であり、買電がＷB で、コジェネレーションシステムＣ
ＧＳは定格運転点がＹ2 ’’であり、ヒートポンプＨへ
の電気入力はＷH である。Accordingly, with respect to the demand for small X 1 thermoelectric load ratio of 2, cogeneration systems CGS is operated by Y 1 that following the power load W L, excess heat Q ST1 is stored in the thermal storage tank ST . On the other hand, X 2 having a large thermoelectric load ratio
= Q L / W L , a part of the heat load Q ST2 is stored in the heat storage tank ST
Since the heat is supplied from the heat source, the deemed heat demand required for the cogeneration system is Q h ′, and the required thermoelectric demand point is X 2 ′. An operating point of cogeneration system + power purchase 'intersection Y 2 between the line l and the thermoelectric generating linear a + b that passes through the slope becomes 1 / COP' thermoelectric demand point X 2, in purchased power is W B, cogeneration System C
GS has a rated operating point of Y 2 ″, and the electric input to the heat pump H is W H.

【００１２】従って、上記実施例によれば、熱電負荷比
が小なる時は電力負荷追従運転で余剰熱を蓄熱槽に蓄え
ておき、熱電負荷化が大きい時は蓄熱槽内の熱を使いつ
つ買電を含めた熱電負荷需要を賄いうることが可能な制
御性のよい、信頼性のある制御方法を提供できる。Therefore, according to the above embodiment, when the thermoelectric load ratio is small, the surplus heat is stored in the heat storage tank by the power load following operation, and when the thermoelectric load is large, the heat in the heat storage tank is used. A highly controllable and reliable control method capable of covering the thermoelectric load demand including power purchase can be provided.

【００１３】[0013]

【発明の効果】以上のように、本発明によれば、負荷側
と熱源機群側とを蓄熱槽を介して構成し、熱源機として
コジェネレーションシステムとヒートポンプを並列に配
置し、熱電比が小の時は電力追従運転を実行し、余剰熱
を蓄熱槽に蓄え、熱電比が大の時は蓄熱槽の熱を利用
し、残りの熱負荷と電力負荷に対し、買電を伴う運転を
するので、任意の電力負荷と任意の熱負荷に対応でき、
しかも熱源機側のバックアップが自動的に実行でき、制
御が簡単になるという効果がある。As described above, according to the present invention, the load side and the heat source device group side are configured via the heat storage tank, and the cogeneration system and the heat pump are arranged in parallel as the heat source device, and the heat-to-electricity ratio is reduced. When the power is small, the power follow-up operation is performed, and the surplus heat is stored in the heat storage tank. So it can handle any power load and any heat load,
Moreover, there is an effect that the backup on the heat source device side can be automatically executed, and the control is simplified.

【図面の簡単な説明】[Brief description of the drawings]

【図１】本発明の一実施例によるコジェネレーションシ
ステムとヒートポンプと蓄熱槽の構成図である。FIG. 1 is a configuration diagram of a cogeneration system, a heat pump, and a heat storage tank according to an embodiment of the present invention.

【図２】エンジン駆動方コジェネレーションシステムの
熱電発生図である。FIG. 2 is a thermoelectric generation diagram of an engine-driven cogeneration system.

【図３】従来のコジェネレーションシステムにおける蓄
熱槽を含むシステムの構成図である。FIG. 3 is a configuration diagram of a system including a heat storage tank in a conventional cogeneration system.

【符号の説明】[Explanation of symbols]

ＣＧＳ エンジン駆動コジェネレーションシステム ＳＴ 蓄熱槽 Ｈ ヒートポンプ ＣＯＰ 成績係数 ＷL 電力負荷（電力需要量） ＱL 熱負荷 Ｘ1 ，Ｘ2 熱電（負荷）需要点 Ｙ1 ，Ｙ2 コジェネレーション運転点 ＱST1 余剰熱 ＱST2 蓄熱槽からの利用熱量 Ｑh ’ みなし熱需要量 ｌ 熱電実現直線 ａ 熱電発生直線 ｂ 買電直線 ａ＋ｂ 熱電供給線 ＷB 買電 ＷH ヒートポンプへの投入電力CGS engine driven cogeneration system ST heat storage tank H heat pump COP coefficient of performance W L power load (power demand) Q L heat load X 1 , X 2 thermoelectric (load) demand point Y 1 , Y 2 cogeneration operating point Q ST1 surplus Heat Q ST2 Heat used from the heat storage tank Q h 'Deemed heat demand l Thermoelectric realization straight line a Thermoelectric generation straight line b Purchasing straight line a + b Heating power supply line W B purchasing power W H Power input to heat pump

───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平３−253756（ＪＰ，Ａ) 特開 平１−144101（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) G05D 23/00 - 23/32 G05B 11/00 - 13/04 H02J 3/00 - 5/00 ────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-3-253756 (JP, A) JP-A-1-144101 (JP, A) (58) Fields investigated (Int. Cl. 7 , DB name) G05D 23/00-23/32 G05B 11/00-13/04 H02J 3/00-5/00

Claims (1)

(57)【特許請求の範囲】(57) [Claims] 【請求項１】 エンジン駆動コジェネレーションシステ
ムとヒートポンプ及び蓄熱槽とを組み合わせた熱電併給
システムにおいて、コジェネレーションシステムにおけ
る熱電発生比率に対し、需要側熱電比率が小さい時は、
電力需要に合わせてコジェネレーションシステムを運転
し、余剰熱を蓄熱槽に蓄熱し、需要側熱電比率が大きい
時は、所望熱電需要量から蓄熱槽からの利用熱量を差し
引いたみなし熱需要量を求め、上記みなし熱需要量と所
望電力需要量とから成る熱電需要点を求め、上記コジェ
ネレーションシステムの熱電発生図中の上記熱電需要点
を通り傾きが成績係数の逆数となる熱電実現直線と上記
コジェネレーションシステムの熱電発生図中の熱電発生
直線の上に買電直線を重ねた熱電供給線を作成し、上記
熱電実現直線と上記熱電供給線との交点で上記コジェネ
レーションシステムとヒートポンプを運転するコジェネ
レーションシステムの運転制御方法。In a cogeneration system combining an engine-driven cogeneration system with a heat pump and a heat storage tank, when the demand-side heat / power ratio is smaller than the thermoelectric generation ratio in the cogeneration system,
Operate the cogeneration system according to the power demand, store the excess heat in the heat storage tank, and when the demand-side heat-to-power ratio is large, find the deemed heat demand by subtracting the amount of heat used from the heat storage tank from the desired heat and power demand. A thermoelectric demand point comprising the deemed heat demand and the desired power demand is obtained, and a thermoelectric realization straight line having a reciprocal of the coefficient of performance, which passes through the thermoelectric demand point in the thermoelectric generation diagram of the cogeneration system and A thermoelectric supply line is created by superimposing a power purchase straight line on the thermoelectric generation line in the thermoelectric generation diagram of the generation system, and operating the cogeneration system and heat pump at the intersection of the thermoelectric realization line and the thermoelectric supply line. Operation control method for generation system.
JP21416692A 1992-08-11 1992-08-11 Operation control method for cogeneration system Expired - Fee Related JP3258998B2 (en)

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JP21416692A JP3258998B2 (en) 1992-08-11 1992-08-11 Operation control method for cogeneration system

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JP3258998B2 true JP3258998B2 (en) 2002-02-18

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JP2002008695A (en) * 2000-06-27 2002-01-11 Idemitsu Kosan Co Ltd Running time setting method of combined heat and power generation equipment
JP2008180473A (en) * 2007-01-26 2008-08-07 Kenji Umetsu Hybrid energy-using heat pump device

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