JPH0625541B2 - Cooling water control device for heat exchanger - Google Patents
Cooling water control device for heat exchangerInfo
- Publication number
- JPH0625541B2 JPH0625541B2 JP62274668A JP27466887A JPH0625541B2 JP H0625541 B2 JPH0625541 B2 JP H0625541B2 JP 62274668 A JP62274668 A JP 62274668A JP 27466887 A JP27466887 A JP 27466887A JP H0625541 B2 JPH0625541 B2 JP H0625541B2
- Authority
- JP
- Japan
- Prior art keywords
- cooling water
- heat exchanger
- humidity
- flow rate
- temperature
- 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 - Lifetime
Links
- 239000000498 cooling water Substances 0.000 title claims description 56
- 229920006395 saturated elastomer Polymers 0.000 claims description 27
- 238000009529 body temperature measurement Methods 0.000 claims description 4
- 238000005259 measurement Methods 0.000 claims description 2
- 239000007789 gas Substances 0.000 description 45
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 21
- 238000001816 cooling Methods 0.000 description 14
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
- 229910052799 carbon Inorganic materials 0.000 description 5
- 230000007797 corrosion Effects 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 4
- 230000006866 deterioration Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 3
- 229910017604 nitric acid Inorganic materials 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical class S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000003518 caustics Substances 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000004071 soot Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 230000004580 weight loss Effects 0.000 description 1
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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Landscapes
- Exhaust Gas After Treatment (AREA)
- Exhaust-Gas Circulating Devices (AREA)
Description
【発明の詳細な説明】 産業上の利用分野 この発明は、熱交換器、等にエンジンの排気管に接続さ
れた熱交換器の劣化防止に関連する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to prevention of deterioration of a heat exchanger such as a heat exchanger connected to an exhaust pipe of an engine.
従来の技術 従来のガスエンジン用熱交換器を第４図について説明す
る。熱交換器１０は、ガスエンジン等のエンジン１１の
排気管１２と、エンジン１１から冷却管１３を流れる冷
却水（一次冷却水）との間で熱交換を行う。エンジン１
１及び熱交換器１０で加熱された冷却管１３内の冷却水
は、更に第二の熱交換器１４に接続される。第二の熱交
換器１４では、冷却管１３内を流れる冷却水と、第二の
冷却管１６を流れる冷却水との間で熱交換を行う。冷却
管１３には、サーモスタット付切り換え弁１５が設けら
れ、冷却管１３を通る冷却水が第二の熱交換器１４を通
りエンジン１１へ供給する通路又は第二の熱交換器１４
を通らずに直接エンジン１１に流入する通路を形成す
る。2. Description of the Related Art A conventional gas engine heat exchanger will be described with reference to FIG. The heat exchanger 10 exchanges heat between an exhaust pipe 12 of an engine 11 such as a gas engine and cooling water (primary cooling water) flowing from the engine 11 to a cooling pipe 13. Engine 1
The cooling water in the cooling pipe 13 heated by the heat exchanger 1 and the heat exchanger 10 is further connected to the second heat exchanger 14. In the second heat exchanger 14, heat exchange is performed between the cooling water flowing in the cooling pipe 13 and the cooling water flowing in the second cooling pipe 16. The cooling pipe 13 is provided with a thermostatic switching valve 15, and a passage through which the cooling water passing through the cooling pipe 13 passes through the second heat exchanger 14 and is supplied to the engine 11 or the second heat exchanger 14.
A passage is formed that directly flows into the engine 11 without passing through.
上記構成において、熱交換器１０は、エンジン１１から
排出されかつ排気管１２を通る排気ガスの熱を、冷却管
１３を通る冷却水により受熱する。この熱は第二の熱交
換器１４に供給され、第二の冷却管１６から熱が回収さ
れる。第二の冷却管１６の加熱された高温冷却水は空気
調和装置用の温水又は給湯等に利用される。排気管１２
を通る排気ガスは、第一の熱交換器１０に流入し、ここ
で、冷却管１３の冷却水に熱を奪われた後、大気中に放
出される。In the above configuration, the heat exchanger 10 receives the heat of the exhaust gas discharged from the engine 11 and passing through the exhaust pipe 12 by the cooling water passing through the cooling pipe 13. This heat is supplied to the second heat exchanger 14, and the heat is recovered from the second cooling pipe 16. The heated high-temperature cooling water in the second cooling pipe 16 is used as hot water or hot water for the air conditioner. Exhaust pipe 12
The exhaust gas passing through flows into the first heat exchanger 10, where heat is taken by the cooling water in the cooling pipe 13 and then released into the atmosphere.
冷却管１３を通る一次冷却水は、ポンプ（図示せず）に
より循環されるが、熱交換器１０内を通過した後、サー
モスタット付切り換え弁１５により流れ方向が制御され
る。サーモスタット付切り換え弁１５は、例えば８０℃
以上の温度に設定され、一次冷却水が水温８０℃以下の
時は第二の熱交換器１４を通らずガスエンジン１１に直
接戻される。しかし、一次冷却水の水温が８０℃を超え
るときは、一次冷却水の第二の熱交換器１４を通りガス
エンジン１１に戻る流路が形成される。The primary cooling water that passes through the cooling pipe 13 is circulated by a pump (not shown), but after passing through the heat exchanger 10, the flow direction is controlled by the thermostatic switching valve 15. Switching valve 15 with thermostat is, for example, 80 ° C
When the primary cooling water is set to the above temperature and the water temperature is 80 ° C. or less, it is returned directly to the gas engine 11 without passing through the second heat exchanger 14. However, when the water temperature of the primary cooling water exceeds 80 ° C., a flow path that returns to the gas engine 11 through the second heat exchanger 14 of the primary cooling water is formed.
ガスエンジン１１の排気管１２内では、冷却水との間で
熱交換を行うとき、排気ガスが過度に冷えるため、排気
中の水分やスス等の付着が促進され、熱交換器１０の排
気側の通路に腐食又は目詰まり等の劣化が生じた。即
ち、熱交換器１０を通過する排気ガスが一般に１５０℃
〜２００℃以下になると、排気ガス中に含まれる水蒸気
が凝縮水となる凝結現象が生ずる。熱交換器１０の内壁
により、排気ガスは露点以下の温度に冷却される。排気
ガス中には、水蒸気、硫黄又は窒素が含まれ、この冷却
により水蒸気圧力が飽和蒸気圧以下に減圧されると、熱
交換器１０内では、内壁に水蒸気が凝結し、硫酸又は硝
酸等の腐食性成分を含む凝縮水が生成される。In the exhaust pipe 12 of the gas engine 11, when heat is exchanged with the cooling water, the exhaust gas is excessively cooled, so that water, soot, etc. in the exhaust are promoted to adhere to the exhaust side of the heat exchanger 10. Corrosion or deterioration such as clogging occurred in the passage. That is, the exhaust gas passing through the heat exchanger 10 is generally 150 ° C.
If the temperature falls below 200 ° C, a condensation phenomenon occurs in which the water vapor contained in the exhaust gas becomes condensed water. The exhaust gas is cooled to a temperature below the dew point by the inner wall of the heat exchanger 10. Exhaust gas contains water vapor, sulfur, or nitrogen, and when the water vapor pressure is reduced to a saturated vapor pressure or less by cooling this, water vapor condenses on the inner wall of the heat exchanger 10 to generate sulfuric acid, nitric acid, or the like. Condensed water containing corrosive components is produced.
ガスエンジン１１には、都市ガス又はＬＰＧ等のガス燃
料が用いられる。これらの燃料はＳＨ基で構成されるメ
ルカプタンを含み、メルカプタンは燃焼時に水蒸気と反
応して硫酸を生ずる。また、燃焼時に酸素を供給する空
気中には窒素が含まれ、窒素は水蒸気と反応して硝酸と
なる。生成される硫酸又は硝酸は弱酸性であるが、熱交
換器１０内の温度が高いため、活性に富み、このため熱
交換器１０の内面を腐食する時間当りの腐食減量は大き
い。更に、排気管の温度が低いと、排気ガス中に含まれ
るカーボンが排気管の内壁に付着して、排気管に目詰ま
りが発生した。A gas fuel such as city gas or LPG is used for the gas engine 11. These fuels include mercaptans composed of SH groups, which react with steam during combustion to produce sulfuric acid. In addition, nitrogen is contained in the air that supplies oxygen during combustion, and the nitrogen reacts with water vapor to form nitric acid. The generated sulfuric acid or nitric acid is weakly acidic, but since the temperature inside the heat exchanger 10 is high, it is rich in activity, and therefore the corrosion weight loss per unit time that corrodes the inner surface of the heat exchanger 10 is large. Further, when the temperature of the exhaust pipe was low, carbon contained in the exhaust gas adhered to the inner wall of the exhaust pipe, and the exhaust pipe was clogged.
このような欠点を解消するため、特開昭６１−１４９７
９６号公報に示されるように、排気ガスの温度を測定し
て、この温度レベルに対応して冷却水を流す方法が提案
されている。この公報に示されるように、ガスエンジン
用の排気熱回収用熱交換器を流れる排気ガスの温度を検
出し、この温度に対応して熱交換器を流れる冷却水の流
量を制御する低温流体制御法は公知である。In order to solve such a defect, JP-A-61-1497
As disclosed in Japanese Patent Laid-Open No. 96-96, a method has been proposed in which the temperature of exhaust gas is measured and cooling water is caused to flow in accordance with this temperature level. As disclosed in this publication, a low temperature fluid control for detecting the temperature of exhaust gas flowing through an exhaust heat recovery heat exchanger for a gas engine and controlling the flow rate of cooling water flowing through the heat exchanger corresponding to this temperature. The method is known.
発明が解決しようとする問題点 しかし、従来の低温流体制御装置では、エンジンの排気
ガス温度を検出して熱交換器への冷却水の流量を制御す
るので、排気ガス中の水分の凝縮及びカーボンの付着を
十分に防止することができなかった。即ち、排気管の内
壁に水滴及びカーボンが付着する条件は、排気ガスの温
度のみではなく、飽和湿度が主要因である。排気管の温
度が低くても、排気ガス中の湿度が飽和湿度に達しない
ときは、排気管の内壁に水滴は付着しない。逆に、排気
管の温度が高い場合に、排気ガス中の湿度が飽和湿度を
超えているとき、排気管の内壁に水滴が付着する。排気
ガス中のカーボンは、排気管の内壁に付着する水滴と共
に排気管の内壁に付着して、エンジンの稼動と共に堆積
する。DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in the conventional cryogenic fluid control device, the exhaust gas temperature of the engine is detected to control the flow rate of the cooling water to the heat exchanger. Could not be sufficiently prevented. That is, the condition that water droplets and carbon adhere to the inner wall of the exhaust pipe is not only the temperature of the exhaust gas but also the saturated humidity. Even if the temperature of the exhaust pipe is low, water drops do not adhere to the inner wall of the exhaust pipe when the humidity in the exhaust gas does not reach the saturated humidity. On the contrary, when the temperature of the exhaust pipe is high and the humidity in the exhaust gas exceeds the saturated humidity, water drops adhere to the inner wall of the exhaust pipe. Carbon in the exhaust gas adheres to the inner wall of the exhaust pipe together with water droplets that adhere to the inner wall of the exhaust pipe, and accumulates as the engine operates.
このような現象が現実に発生している以上、従来のよう
に、単に排気ガスの温度のみを測定しても、熱交換器の
腐食及び目詰まりを十分に防止することができない。Since such a phenomenon actually occurs, corrosion and clogging of the heat exchanger cannot be sufficiently prevented by simply measuring the temperature of the exhaust gas as in the conventional case.
そこで、この発明は、従来の上記欠点を解消して、排気
ガス中の湿度及び排気管の温度における飽和湿度に対応
して冷却水の流量を制御できる熱交換器の冷却水制御装
置を提供することを目的とする。Therefore, the present invention solves the above-mentioned conventional drawbacks and provides a cooling water control device for a heat exchanger capable of controlling the flow rate of the cooling water in accordance with the humidity in the exhaust gas and the saturated humidity at the temperature of the exhaust pipe. The purpose is to
問題点を解決するための手段 この発明による熱交換器の冷却水制御装置は、エンジン
の排気管に接続されかつエンジンの排気ガスと冷却水と
の間で熱交換を行う熱交換器と、熱交換器の冷却水の流
量を制御する流量制御装置と、排気ガスの湿度を測定す
る湿度測定装置と、排気管の温度を測定する温度測定装
置と、温度測定装置により測定された排気管の温度に対
応する飽和湿度に対して湿度測定装置により測定された
排気ガスの湿度が高いとき、流量制御装置を制御して熱
交換器への冷却水の流量を制御する流量制御回路とを設
けた構成を有する。Means for Solving the Problems A cooling water control device for a heat exchanger according to the present invention includes a heat exchanger that is connected to an exhaust pipe of an engine and exchanges heat between exhaust gas of the engine and cooling water. A flow rate control device that controls the flow rate of the cooling water of the exchanger, a humidity measurement device that measures the humidity of the exhaust gas, a temperature measurement device that measures the temperature of the exhaust pipe, and a temperature of the exhaust pipe that is measured by the temperature measurement device. And a flow rate control circuit that controls the flow rate control device to control the flow rate of the cooling water to the heat exchanger when the humidity of the exhaust gas measured by the humidity measuring device is higher than the saturation humidity corresponding to Have.
作用 流量制御回路は、温度測定装置により測定された排気管
の温度に対応する飽和湿度に対して湿度測定装置により
測定された排気ガスの湿度が高いとき、流量制御装置を
制御して冷却水の流量を制御し、排気管の温度に対応す
る飽和湿度に対して排気ガスの湿度が低いときは、冷却
水の流量制御を行わない。The flow control circuit controls the flow control device to control the cooling water when the humidity of the exhaust gas measured by the humidity measuring device is higher than the saturated humidity corresponding to the temperature of the exhaust pipe measured by the temperature measuring device. The flow rate is controlled, and when the humidity of the exhaust gas is lower than the saturated humidity corresponding to the temperature of the exhaust pipe, the flow rate of the cooling water is not controlled.
実施例 以下、この発明による熱交換器の冷却水制御装置の実施
例を第１図〜第３図について説明する。これらの図面で
は第４図に示す箇所と同一の部分については同一符号を
付し、説明を省略する。Embodiment An embodiment of a cooling water control device for a heat exchanger according to the present invention will be described below with reference to FIGS. In these drawings, the same parts as those shown in FIG. 4 are designated by the same reference numerals, and the description thereof will be omitted.
この発明による熱交換器の冷却水制御装置２０は、排気
管１２内を流れる排気ガスの湿度を測定する湿度測定装
置２１と、排気管の温度を測定する温度測定装置２２
と、熱交換器の冷却水の流量を制御する流量制御装置２
３と、温度測定装置により測定された排気管の温度に対
応する飽和湿度に対して湿度測定装置により測定された
排気ガスの湿度が高いとき、流量制御装置を制御して熱
交換器への冷却水の流量を制御する流量制御回路２４と
が設けられる。A cooling water control device 20 for a heat exchanger according to the present invention includes a humidity measuring device 21 for measuring the humidity of exhaust gas flowing in the exhaust pipe 12 and a temperature measuring device 22 for measuring the temperature of the exhaust pipe.
And a flow rate control device 2 for controlling the flow rate of cooling water of the heat exchanger
3 and when the humidity of the exhaust gas measured by the humidity measuring device is higher than the saturated humidity corresponding to the temperature of the exhaust pipe measured by the temperature measuring device, the flow control device is controlled to cool the heat exchanger. A flow rate control circuit 24 that controls the flow rate of water is provided.
湿度測定装置２１は、乾湿計、露点計、毛髪湿度計、赤
外線吸収湿度計、電気抵抗式湿度計等種々の湿度測定装
置を使用することができる。赤外線吸収湿度計は、特定
の赤外線が水蒸気に吸収されることを利用したものであ
る。また、電気抵抗式湿度計は、吸湿性物質（主にLiC
l）の薄層の電気抵抗が湿度によって変化する特性を利
用したものである。As the humidity measuring device 21, various humidity measuring devices such as a psychrometer, a dew point meter, a hair hygrometer, an infrared absorption hygrometer, and an electric resistance type hygrometer can be used. The infrared absorption hygrometer utilizes absorption of specific infrared rays by water vapor. Electric resistance type hygrometers use hygroscopic substances (mainly LiC
This is based on the property that the electrical resistance of the thin layer in l) changes with humidity.
温度測定装置２２は、熱電対、負特性又は正特性のサー
ミスタ、バイメタル等種々の温度測定装置を使用でき
る。As the temperature measuring device 22, various temperature measuring devices such as a thermocouple, a negative or positive characteristic thermistor, and a bimetal can be used.
流量制御装置２３は、冷却管１３を流れる冷却水を循環
するポンプ、流量制御弁又は熱交換器１０への流量を制
限してエンジン１１又は第二の熱交換器１４へ戻す切り
換え弁である。The flow rate control device 23 is a pump that circulates the cooling water flowing through the cooling pipe 13, a flow rate control valve, or a switching valve that limits the flow rate to the heat exchanger 10 and returns it to the engine 11 or the second heat exchanger 14.
流量制御回路２４は、マイクロコンピュータ等の集積回
路を使用して作成することができる。何れにしても、流
量制御回路２４は、温度測定装置２２に接続されかつ飽
和湿度を演算する飽和湿度決定手段と、飽和湿度決定手
段及び湿度測定装置２１に接続されかつ飽和湿度決定手
段の出力より湿度測定手段の出力が大きいとき、流量制
御装置に制御出力を与えて冷却水の流量を制御比較手段
を有する。この動作を第２図のフローチャートについて
説明する。The flow rate control circuit 24 can be created using an integrated circuit such as a microcomputer. In any case, the flow rate control circuit 24 is connected to the temperature measuring device 22 and calculates the saturated humidity, and the saturated humidity determining means and the saturated humidity determining means and the humidity measuring device 21 output from the saturated humidity determining means. When the output of the humidity measuring means is large, the control output is provided to the flow rate control device to control the flow rate of the cooling water by the control comparing means. This operation will be described with reference to the flowchart of FIG.
まず、ステップ３０では、湿度測定装置２１からの信号
を受信して、排気管１２を流れる排気ガスの湿度を検出
する。次に、ステップ３１では、温度測定装置２２から
の信号を受信して、排気管１２の温度を検出する。流量
制御回路２４内には、演算回路が設けられ、ステップ３
２では、排気管１２の温度での飽和湿度を決定する。こ
の飽和湿度は、湿り空気線図を利用して容易に求めるこ
とができる。ステップ３３では、比較手段によって排気
ガスの湿度が飽和湿度より大きいか否か判断する。排気
ガスの湿度が飽和湿度より大きい又は等しいとき、ステ
ップ３４に進み、流量制御装置２３により冷却水の流量
が制御される。この流量制御は、冷却管１３を流れる冷
却水を循環するポンプ、流量制御弁又は切り換え弁によ
り熱交換器１０への冷却水の流量を減少状態、零流量状
態又は非増加状態にすることにより行われる。しかし、
排気ガスの湿度が飽和湿度に満たないときは、ステップ
３５において冷却水の流量は制御されない。ステップ３
４及び３５において冷却水の流量を制御した後又は非制
御後、ステップ３３に戻り、エンジン１１の稼動中、常
に排気ガス中の湿度と飽和湿度とが比較される。First, in step 30, a signal from the humidity measuring device 21 is received and the humidity of the exhaust gas flowing through the exhaust pipe 12 is detected. Next, in step 31, the signal from the temperature measuring device 22 is received and the temperature of the exhaust pipe 12 is detected. An arithmetic circuit is provided in the flow rate control circuit 24, and step 3
At 2, the saturated humidity at the temperature of the exhaust pipe 12 is determined. This saturated humidity can be easily obtained using a moist air diagram. In step 33, the comparison means determines whether or not the humidity of the exhaust gas is higher than the saturated humidity. When the humidity of the exhaust gas is greater than or equal to the saturation humidity, the process proceeds to step 34, and the flow rate control device 23 controls the flow rate of the cooling water. This flow rate control is performed by changing the flow rate of the cooling water to the heat exchanger 10 to a decreasing state, a zero flow state or a non-increasing state by a pump, a flow rate control valve or a switching valve that circulates the cooling water flowing through the cooling pipe 13. Be seen. But,
When the humidity of the exhaust gas is less than the saturated humidity, the flow rate of the cooling water is not controlled in step 35. Step 3
After controlling or non-controlling the flow rate of the cooling water in 4 and 35, the process returns to step 33, and the humidity in the exhaust gas and the saturated humidity are constantly compared while the engine 11 is operating.
第３図は、流量制御回路２４の具体的な回路を示す。排
気管１２内を流れる排気ガスの湿度を測定する湿度測定
装置２１は、増幅器２５を介して差動増幅器２８の反転
入力端子に接続される。また、排気管の温度を測定する
温度測定装置２２は、増幅器２６を介して演算増幅器２
７の非反転入力端子に接続される。演算増幅器２７の反
転入力端子は適当な電源に接続される。演算増幅器２７
は排気管１２の温度での飽和湿度を演算する。演算増幅
器２７の出力は、差動増幅器２８の非反転入力端子に供
給される。作動増幅器２８の出力は、トランジスタ等の
ドライバ回路２９に送出される。ドライバ回路２９は、
そのオン時に、熱交換器の熱交換器への冷却水の流量を
制御する流量制御装置２３を作動する。FIG. 3 shows a specific circuit of the flow rate control circuit 24. The humidity measuring device 21 for measuring the humidity of the exhaust gas flowing through the exhaust pipe 12 is connected to the inverting input terminal of the differential amplifier 28 via the amplifier 25. Further, the temperature measuring device 22 for measuring the temperature of the exhaust pipe includes the operational amplifier 2 via the amplifier 26.
7 non-inverting input terminal. The inverting input terminal of the operational amplifier 27 is connected to an appropriate power source. Operational amplifier 27
Calculates the saturated humidity at the temperature of the exhaust pipe 12. The output of the operational amplifier 27 is supplied to the non-inverting input terminal of the differential amplifier 28. The output of the operational amplifier 28 is sent to a driver circuit 29 such as a transistor. The driver circuit 29 is
When it is turned on, the flow rate control device 23 that controls the flow rate of the cooling water to the heat exchanger of the heat exchanger is operated.
第３図の構成において、温度測定装置２２の出力に基づ
いて演算増幅器２７は、飽和湿度を表す出力を作動増幅
器２８の非反転入力端子に供給する。また、湿度測定装
置２１は、差動増幅器２８の反転入力端子に出力を与え
る。差動増幅器２８は、演算増幅器２７の出力が増幅器
２５の出力より小さいとき、ドライバ回路２９に出力を
供給して流量制御装置２３を作動して冷却水を循環す
る。しかし、演算増幅器２７の出力が増幅器２５の出力
より大きいとき又は等しいとき、流量制御装置２３を制
御して冷却水の流量を減少状態、零流量状態又は非増加
状態にする。In the configuration of FIG. 3, the operational amplifier 27 supplies an output representing the saturated humidity to the non-inverting input terminal of the operational amplifier 28 based on the output of the temperature measuring device 22. Further, the humidity measuring device 21 gives an output to the inverting input terminal of the differential amplifier 28. When the output of the operational amplifier 27 is smaller than the output of the amplifier 25, the differential amplifier 28 supplies the output to the driver circuit 29 to operate the flow rate control device 23 and circulate the cooling water. However, when the output of the operational amplifier 27 is greater than or equal to the output of the amplifier 25, the flow rate control device 23 is controlled to bring the flow rate of the cooling water into the decreasing state, the zero flow rate state or the non-increasing state.
上記のように、流量制御回路２４は、温度測定装置２２
により測定された排気管の温度に対応する飽和湿度に対
して湿度測定装置２１により測定された排気ガスの湿度
が高いとき、流量制御装置を制御して冷却水の流量を制
御し、排気管の温度に対応する飽和湿度に対して排気ガ
スの湿度が低いときは、冷却水の流量制御を行わない。
従って、排気管の温度が低く、排気ガス中の湿度が飽和
湿度に達しないは、冷却水が循環される。また、排気管
の温度が高くても、排気ガス中の湿度が飽和湿度を超え
ているときは、冷却水の流量が制限される。このため、
排気管の内壁に水滴が付着する現象及び付着する水滴と
共に排気管の内壁に排気ガス中のカーボンが付着する現
象が生じない。As described above, the flow rate control circuit 24 includes the temperature measuring device 22.
When the humidity of the exhaust gas measured by the humidity measuring device 21 is high with respect to the saturated humidity corresponding to the temperature of the exhaust pipe measured by, the flow rate control device is controlled to control the flow rate of the cooling water. When the humidity of the exhaust gas is lower than the saturated humidity corresponding to the temperature, the flow rate of the cooling water is not controlled.
Therefore, the cooling water is circulated when the temperature of the exhaust pipe is low and the humidity in the exhaust gas does not reach the saturated humidity. Further, even if the temperature of the exhaust pipe is high, the flow rate of the cooling water is limited when the humidity in the exhaust gas exceeds the saturated humidity. For this reason,
The phenomenon that water droplets adhere to the inner wall of the exhaust pipe and the phenomenon that carbon in exhaust gas adheres to the inner wall of the exhaust pipe do not occur together with the water droplets that adhere.
発明の効果 この発明では、排気ガスの湿度及び排気管の温度を測定
して、熱交換器へ流れる冷却水の流量が制御される。冷
却水の流量を制御し、排気管の内壁での水滴の付着を防
止することにより、腐食性物質による熱交換器の排気管
の腐食及びカーボンの付着による目詰まりを防止するこ
とができる。このように、熱交換器の劣化を防止すると
共に、熱交換効率の低下を阻止することが可能となる。Effects of the Invention In the present invention, the flow rate of the cooling water flowing to the heat exchanger is controlled by measuring the humidity of the exhaust gas and the temperature of the exhaust pipe. By controlling the flow rate of the cooling water and preventing water droplets from adhering to the inner wall of the exhaust pipe, it is possible to prevent corrosion of the exhaust pipe of the heat exchanger due to corrosive substances and clogging due to carbon adhesion. In this way, it is possible to prevent deterioration of the heat exchanger and prevent deterioration of heat exchange efficiency.
第１図はこの発明により熱交換器の冷却水制御装置のブ
ロック図、第２図は流量制御回路の動作を示すフローチ
ャート、第３図は流量制御回路の回路図、第４図は従来
の熱交換器のブロック図である。 １１……エンジン、１０……熱交換器、１２……排気
管、２０……冷却水制御装置、２１……湿度測定装置、
２２……温度測定装置、２３……流量制御装置、２４…
…流量制御回路、FIG. 1 is a block diagram of a cooling water controller for a heat exchanger according to the present invention, FIG. 2 is a flow chart showing the operation of a flow rate control circuit, FIG. 3 is a circuit diagram of the flow rate control circuit, and FIG. It is a block diagram of an exchanger. 11 ... Engine, 10 ... Heat exchanger, 12 ... Exhaust pipe, 20 ... Cooling water control device, 21 ... Humidity measuring device,
22 ... Temperature measuring device, 23 ... Flow control device, 24 ...
... Flow control circuit,
Claims (3)
の排気ガスと冷却水との間で熱交換を行う熱交換器と、
熱交換器の冷却水の流量を制御する流量制御装置と、排
気ガスの湿度を測定する湿度測定装置と、排気管の温度
を測定する温度測定装置と、温度測定装置により測定さ
れた排気管の温度に対応する飽和湿度に対して湿度測定
装置により測定された排気ガスの湿度が高いとき、流量
制御装置を制御して熱交換器への冷却水の流量を制御す
る流量制御回路とで構成されることを特徴とする熱交換
器の冷却水制御装置。1. A heat exchanger that is connected to an exhaust pipe of an engine and exchanges heat between exhaust gas of an engine and cooling water.
A flow rate control device that controls the flow rate of the cooling water of the heat exchanger, a humidity measurement device that measures the humidity of the exhaust gas, a temperature measurement device that measures the temperature of the exhaust pipe, and an exhaust pipe measured by the temperature measurement device. When the humidity of the exhaust gas measured by the humidity measuring device is high relative to the saturated humidity corresponding to the temperature, it is composed of a flow control circuit that controls the flow control device to control the flow of cooling water to the heat exchanger. A cooling water control device for a heat exchanger, characterized in that
かつ飽和湿度を演算する飽和湿度決定手段と、飽和湿度
決定手段及び湿度測定装置に接続されかつ飽和湿度決定
手段の出力より湿度測定手段の出力が大きいとき、流量
制御装置に制御出力を与えて熱交換器への冷却水の流量
を制御する比較手段とを有する特許請求の範囲第(1)項
記載の熱交換器の冷却水制御装置。2. A flow rate control circuit is connected to a temperature measuring device and calculates a saturated humidity, and a saturated humidity determining means; and a saturated humidity determining means and a humidity measuring device. Control means for controlling the flow rate of the cooling water to the heat exchanger by giving a control output to the flow rate control device when the output of the cooling water is large, the cooling water control of the heat exchanger according to claim (1). apparatus.
流量制御弁又は切り換え弁である特許請求の範囲第(1)
項記載の熱交換器の冷却水制御装置。3. A flow rate control device is a pump for circulating cooling water,
Claim (1) which is a flow control valve or a switching valve.
A cooling water control device for a heat exchanger according to the item.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62274668A JPH0625541B2 (en) | 1987-10-31 | 1987-10-31 | Cooling water control device for heat exchanger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62274668A JPH0625541B2 (en) | 1987-10-31 | 1987-10-31 | Cooling water control device for heat exchanger |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01117909A JPH01117909A (en) | 1989-05-10 |
| JPH0625541B2 true JPH0625541B2 (en) | 1994-04-06 |
Family
ID=17544893
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62274668A Expired - Lifetime JPH0625541B2 (en) | 1987-10-31 | 1987-10-31 | Cooling water control device for heat exchanger |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0625541B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2601072B2 (en) * | 1991-09-20 | 1997-04-16 | 株式会社日立製作所 | Internal combustion engine, operating method thereof, and automobile |
| CN103498713B (en) * | 2013-09-29 | 2016-08-17 | 宝鸡石油机械有限责任公司 | Large-scale diesel engine energy-saving and noise-reducing security system |
-
1987
- 1987-10-31 JP JP62274668A patent/JPH0625541B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01117909A (en) | 1989-05-10 |
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