JP5377371B2 - Oxy-combustion coal-fired power generation system - Google Patents

Oxy-combustion coal-fired power generation system Download PDF

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JP5377371B2
JP5377371B2 JP2010055186A JP2010055186A JP5377371B2 JP 5377371 B2 JP5377371 B2 JP 5377371B2 JP 2010055186 A JP2010055186 A JP 2010055186A JP 2010055186 A JP2010055186 A JP 2010055186A JP 5377371 B2 JP5377371 B2 JP 5377371B2
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信幸 穂刈
久幸 折田
喜治 林
正明 向出
強 柴田
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Abstract

<P>PROBLEM TO BE SOLVED: To provide an oxygen combustion type coal fired power generation system, capable of improving heat efficiency of the oxygen combustion type coal fired power generation system, and preventing corrosion of piping materials constituting a system of a fired power generation system, by suppressing the generation of condensate water and generation of acid in a combustion exhaust gas. <P>SOLUTION: In the oxygen combustion type coal fired power generation system, a heat exchanger 4 for temperature rise of oxygen, heating oxygen generated by an oxygen manufacturing device 12 by the combustion exhaust gas, is disposed in a combustion exhaust gas system; an oxygen supply system 14 for allowing oxygen to flow down, is disposed in a state of being connected to an exhaust gas system 15 for mixing from the oxygen manufacturing device 12 through the heat exchanger 4 for temperature rise of oxygen; the oxygen heated by the heat exchanger 4 for the temperature rise of oxygen is mixed with the combustion exhaust gas flowing down in the exhaust gas system 15 for mixing to prepare a support gas of a desired temperature; and the support gas is supplied to a coal boiler 1 through the exhaust gas system 15 for mixing. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

本発明は、石炭を燃料とする酸素燃焼方式の石炭ボイラを備えた酸素燃焼型石炭火力発電システムに関する。   The present invention relates to an oxyfuel-type coal-fired power generation system including an oxyfuel-type coal boiler using coal as fuel.

近年、地球温暖化が地球規模の環境問題として取り上げられている。大気中の二酸化炭素濃度の増加が地球温暖化の主要因であることが明らかにされており、二酸化炭素排出量の削減が重要になっている。   In recent years, global warming has been taken up as a global environmental problem. It has been clarified that an increase in the concentration of carbon dioxide in the atmosphere is a major cause of global warming, and it is important to reduce carbon dioxide emissions.

石炭を燃料とする石炭ボイラを有する石炭火力発電所は二酸化炭素の有力な排出源であり、石炭ボイラから排出する燃焼排ガス中の二酸化炭素を高効率で分離、回収することが課題になっている。   Coal-fired power plants with coal-fired coal boilers are a powerful source of carbon dioxide, and it has become a challenge to separate and recover carbon dioxide in combustion exhaust gas discharged from coal boilers with high efficiency. .

石炭を燃料とする石炭ボイラを有する従来の石炭火力発電所では、空気を用いて燃料を燃焼する空気燃焼方式を採用しているが、空気には燃焼に関与しない約８０％の窒素が含まれ、この窒素が燃焼排ガス中の二酸化炭素を高効率で分離、除去する際の阻害要因になっている。   Conventional coal-fired power plants with coal-fired coal boilers employ an air combustion system that uses air to burn the fuel, but the air contains about 80% nitrogen that does not contribute to combustion. This nitrogen is an obstructive factor in separating and removing carbon dioxide in combustion exhaust gas with high efficiency.

この阻害要因を取り除くために、例えば特許第３０６８８８８号公報には、石炭を酸素で燃焼する石炭燃焼型火力発電システムに設置される酸素燃焼方式の石炭ボイラが開示されている。   In order to remove this obstruction factor, for example, Japanese Patent No. 3068888 discloses an oxyfuel combustion type coal boiler installed in a coal combustion type thermal power generation system for burning coal with oxygen.

前記特許第３０６８８８８号公報に開示された酸素燃焼方式の石炭ボイラでは、石炭を燃焼するボイラから排出された燃焼排ガスは、脱硝装置、ボイラに供給する支燃ガスを排ガスの熱により昇温させるエアヒータ、ボイラに供給する蒸気発生用の給水を排ガスの熱により昇温させる給水加熱器を通過し、乾式電気集塵機で燃焼排ガス中の灰を除去する。   In the oxyfuel combustion type coal boiler disclosed in the above-mentioned Japanese Patent No. 3068888, the combustion exhaust gas discharged from the coal combustion boiler is a denitration device, an air heater that raises the temperature of the combustion support gas supplied to the boiler by the heat of the exhaust gas. Then, the steam generation feed water supplied to the boiler is passed through a feed water heater that raises the temperature by the heat of the exhaust gas, and ash in the combustion exhaust gas is removed by a dry electric dust collector.

さらにこの燃焼排ガスは、脱硫装置、湿式電気集塵機で硫黄酸化物を除去し、脱水装置で水分を除去した後に、ＣＯ２吸脱着装置によって燃焼排ガス中の二酸化炭素を回収され、煙突から大気中に排出される。 Further, after removing sulfur oxide with a desulfurizer and a wet electrostatic precipitator and removing moisture with a dehydrator, the combustion exhaust gas is recovered with carbon dioxide in the combustion exhaust gas by a CO 2 adsorption / desorption device. Discharged.

一方、乾式電気集塵機の下流で燃焼排ガスの一部は分岐されて混合用排ガス系統に送られて、空気から酸素を分離する酸素発生装置で製造された燃焼用の酸素と混合されて燃焼用支燃ガスとなる。   On the other hand, a part of the combustion exhaust gas is branched downstream of the dry electrostatic precipitator and sent to the exhaust gas system for mixing, mixed with the combustion oxygen produced by the oxygen generator that separates oxygen from the air, and supported for combustion. It becomes fuel gas.

即ち、燃焼用の酸素は燃焼に適した酸素分圧とするため、酸素発生装置から供給される前記酸素と石炭燃焼後の燃焼排ガスの一部とを混合させて、酸素と二酸化炭素が混合したガスを燃焼用支燃ガスとして石炭ボイラに供給するように構成している。   That is, in order to make the oxygen for combustion have an oxygen partial pressure suitable for combustion, the oxygen supplied from the oxygen generator and a part of the combustion exhaust gas after coal combustion are mixed to mix oxygen and carbon dioxide. The gas is supplied to the coal boiler as combustion support gas.

窒素を含有しない燃焼用支燃ガスによって前記石炭ボイラで石炭を燃焼することにより、燃焼排ガス中の二酸化炭素濃度を高くできるため、二酸化炭素を高効率で分離、除去することが可能となる。   By burning coal with the coal boiler using combustion support gas that does not contain nitrogen, the concentration of carbon dioxide in the combustion exhaust gas can be increased, so that carbon dioxide can be separated and removed with high efficiency.

特許第３０６８８８８号公報Japanese Patent No. 3068888

しかしながら前記特許第３０６８８８８号公報に開示されたような酸素燃焼方式の石炭ボイラでは、以下のような課題がある。   However, the oxyfuel combustion type coal boiler disclosed in Japanese Patent No. 3068888 has the following problems.

酸素燃焼方式の石炭ボイラでは、脱硫装置で排ガス中の硫黄酸化物を除去するために噴霧する水噴霧によって排ガスの温度が低下するが、この水噴霧により低下した熱の回収、再利用がなされていず、火力発電システムの熱効率を無駄に低下させている問題点がある。   In an oxyfuel combustion type coal boiler, the temperature of exhaust gas is lowered by water spray sprayed to remove sulfur oxides in the exhaust gas by a desulfurization unit, but the heat reduced by this water spray is recovered and reused. However, there is a problem that the thermal efficiency of the thermal power generation system is unnecessarily reduced.

また、酸素燃焼方式の石炭ボイラでは、燃焼排ガスの一部と酸素とを混合して燃焼用支燃ガスを生成させるが、両者が混合される際に燃焼排ガス中には水分や硫黄酸化物が含まれているため、低温の酸素と混合して温度が低下すると燃焼排ガス中の水分が凝縮した凝縮水が発生し、この凝縮水に硫黄酸化物が溶解することによって酸性水が発生して石炭火力発電システムを構成する系統の配管材料がこの酸性水によって腐食されるという問題がある。   In addition, in an oxy-combustion type coal boiler, a part of combustion exhaust gas and oxygen are mixed to generate combustion support gas, but when they are mixed, moisture and sulfur oxides are contained in the combustion exhaust gas. Therefore, when the temperature is lowered by mixing with low-temperature oxygen, condensed water in which moisture in the combustion exhaust gas is condensed is generated, and acid water is generated by dissolving sulfur oxide in this condensed water, thereby generating coal. There is a problem that the piping material of the system constituting the thermal power generation system is corroded by the acidic water.

本発明の目的は酸素燃焼型石炭火力発電システムの熱効率を向上させると共に、石炭ボイラから排出される燃焼排ガス中の凝縮水の発生、及び凝縮水への硫黄酸化物の溶解による酸性水の発生を抑制して火力発電システムの系統を構成する配管材料の腐食を未然に防止し得るようにした酸素燃焼型石炭火力発電システムを提供することにある。   An object of the present invention is to improve the thermal efficiency of an oxyfuel-type coal-fired power generation system, and to generate condensed water in combustion exhaust gas discharged from a coal boiler and generation of acidic water due to dissolution of sulfur oxide in the condensed water. An object of the present invention is to provide an oxyfuel type coal-fired power generation system capable of preventing corrosion of piping materials constituting a system of a thermal power generation system by suppressing it.

本発明の酸素燃焼型石炭火力発電システムは、石炭を燃焼する石炭ボイラと、空気から酸素を分離させて酸素を発生する酸素製造装置とを備え、前記石炭ボイラから排出された燃焼排ガスを流下させる燃焼排ガス系統と、この燃焼排ガス系統から分岐して前記燃焼排ガスの一部を前記石炭ボイラに供給する混合用排ガス系統と、前記酸素製造装置で発生した酸素を流下させる酸素供給系統を前記混合用排ガス系統と接続して前記酸素供給系統を流れる酸素を前記混合用排ガス系統を流れる燃焼排ガスと混合させて石炭燃焼用の支燃ガスを形成し、前記混合用排ガス系統を通じてこの支焼ガスを前記石炭ボイラに供給するように構成した酸素燃焼型石炭火力発電システムにおいて、酸素製造装置で発生した酸素を燃焼排ガスによって昇温する酸素昇温用熱交換器を前記燃焼排ガス系統に設置し、酸素を流下させる前記酸素供給系統を前記酸素製造装置からこの酸素昇温用熱交換器を経由して前記混合用排ガス系統に接続するように配設し、前記酸素昇温用熱交換器によって昇温させた酸素を前記混合用排ガス系統を流下する燃焼排ガスと混合させて所望の温度の支焼ガスを形成し、前記混合用排ガス系統を通じてこの支焼ガスを石炭ボイラに供給し、
前記石炭ボイラの下流側に配設した前記燃焼排ガス系統に、燃焼排ガス中の窒素酸化物を除去する脱硝装置と、この脱硝装置の下流側に設置されて該燃焼排ガスと支燃ガスとの熱交換を行うエアヒータと、このエアヒータの下流側に設置されて該燃焼排ガスによりボイラ給水を加熱する給水加熱器と、この給水加熱器の下流側に設置されて燃焼排ガス中の灰を除去する電気集塵機と、この電気集塵機の下流側に設置されて燃焼排ガス中の硫黄酸化物を除去する脱硫装置と、この脱硫装置の下流側に設置されて燃焼排ガス中の水分を除去する脱水装置と、この脱水装置の下流側に設置されて燃焼排ガス中のＣＯ ２ を回収するＣＯ ２ 吸脱着装置を備えており、前記脱水装置とＣＯ ２ 吸脱着装置との間に位置する燃焼排ガス系統から前記混合用排ガス系統を分岐させ、分岐した燃焼排ガスの一部を前記石炭ボイラに供給するように構成し、前記酸素昇温用熱交換器を前記電気集塵機と脱硫装置との間に位置する燃焼排ガス系統に配設し、前記酸素昇温用熱交換器での燃焼排ガスとの熱交換によって昇温した酸素を流下する前記酸素供給系統をエアヒータより上流側に位置する前記混合用排ガス系統に接続させて酸素と燃焼排ガスとのガス混合部を設け、前記ガス混合部によって酸素と燃焼排ガスとを混合させた支燃ガスを所望の温度に昇温させることを特徴とする。
また本発明の酸素燃焼型石炭火力発電システムは、石炭を燃焼する石炭ボイラと、空気から酸素を分離させて酸素を発生する酸素製造装置とを備え、前記石炭ボイラから排出された燃焼排ガスを流下させる燃焼排ガス系統と、この燃焼排ガス系統から分岐して前記燃焼排ガスの一部を前記石炭ボイラに供給する混合用排ガス系統と、前記酸素製造装置で発生した酸素を流下させる酸素供給系統を前記混合用排ガス系統と接続して前記酸素供給系統を流れる酸素を前記混合用排ガス系統を流れる燃焼排ガスと混合させて石炭燃焼用の支燃ガスを形成し、前記混合用排ガス系統を通じてこの支焼ガスを前記石炭ボイラに供給するように構成した酸素燃焼型石炭火力発電システムであって、酸素製造装置で発生した酸素を燃焼排ガスによって昇温する酸素昇温用熱交換器を前記燃焼排ガス系統に設置し、酸素を流下させる前記酸素供給系統を前記酸素製造装置からこの酸素昇温用熱交換器を経由して前記混合用排ガス系統に接続するように配設し、前記酸素昇温用熱交換器によって昇温させた酸素を前記混合用排ガス系統を流下する燃焼排ガスと混合させて所望の温度の支焼ガスを形成し、前記混合用排ガス系統を通じてこの支焼ガスを石炭ボイラに供給した酸素燃焼型石炭火力発電システムにおいて、
前記石炭ボイラの下流側に配設した前記燃焼排ガス系統に、燃焼排ガス中の窒素酸化物を除去する脱硝装置と、この脱硝装置の下流側に設置されて該燃焼排ガスと支燃ガスとの熱交換を行うエアヒータと、このエアヒータの下流側に設置されて該燃焼排ガスによりボイラ給水を加熱する給水加熱器と、この給水加熱器の下流側に設置されて燃焼排ガス中の灰を除去する電気集塵機と、この電気集塵機の下流側に設置されて燃焼排ガス中の硫黄酸化物を除去する脱硫装置と、この脱硫装置の下流側に設置されて燃焼排ガス中の水分を除去する脱水装置と、この脱水装置の下流側に設置されて燃焼排ガス中のＣＯ ２ を回収するＣＯ ２ 吸脱着装置を備えており、前記脱水装置とＣＯ ２ 吸脱着装置との間に位置する燃焼排ガス系統から前記混合用排ガス系統を分岐させ、分岐した燃焼排ガスの一部を前記石炭ボイラに供給するように構成し、前記酸素昇温用熱交換器を前記エアヒータと給水加熱器との間に位置する燃焼排ガス系統に配設し、前記酸素昇温用熱交換器での燃焼排ガスとの熱交換によって昇温した酸素を流下する前記酸素供給系統をエアヒータより上流側に位置する前記混合用排ガス系統に接続させて酸素と燃焼排ガスとのガス混合部を設け、前記ガス混合部によって酸素と燃焼排ガスとを混合させた支燃ガスを所望の温度に昇温させることを特徴とする。
また本発明の酸素燃焼型石炭火力発電システムは、石炭を燃焼する石炭ボイラと、空気から酸素を分離させて酸素を発生する酸素製造装置とを備え、前記石炭ボイラから排出された燃焼排ガスを流下させる燃焼排ガス系統と、この燃焼排ガス系統から分岐して前記燃焼排ガスの一部を前記石炭ボイラに供給する混合用排ガス系統と、前記酸素製造装置で発生した酸素を流下させる酸素供給系統を前記混合用排ガス系統と接続して前記酸素供給系統を流れる酸素を前記混合用排ガス系統を流れる燃焼排ガスと混合させて石炭燃焼用の支燃ガスを形成し、前記混合用排ガス系統を通じてこの支焼ガスを前記石炭ボイラに供給するように構成した酸素燃焼型石炭火力発電システムであって、酸素製造装置で発生した酸素を燃焼排ガスによって昇温する酸素昇温用熱交換器を前記燃焼排ガス系統に設置し、酸素を流下させる前記酸素供給系統を前記酸素製造装置からこの酸素昇温用熱交換器を経由して前記混合用排ガス系統に接続するように配設し、前記酸素昇温用熱交換器によって昇温させた酸素を前記混合用排ガス系統を流下する燃焼排ガスと混合させて所望の温度の支焼ガスを形成し、前記混合用排ガス系統を通じてこの支焼ガスを石炭ボイラに供給した酸素燃焼型石炭火力発電システムにおいて、
前記石炭ボイラの下流側に配設した前記燃焼排ガス系統に、燃焼排ガス中の窒素酸化物を除去する脱硝装置と、この脱硝装置の下流側に設置されて該燃焼排ガスと支燃ガスとの熱交換を行うエアヒータと、このエアヒータの下流側に設置されて該燃焼排ガスによりボイラ給水を加熱する給水加熱器と、この給水加熱器の下流側に設置されて燃焼排ガス中の灰を除去する電気集塵機と、この電気集塵機の下流側に設置されて燃焼排ガス中の硫黄酸化物を除去する脱硫装置と、この脱硫装置の下流側に設置されて燃焼排ガス中の水分を除去する脱水装置と、この脱水装置の下流側に設置されて燃焼排ガス中のＣＯ ２ を回収するＣＯ ２ 吸脱着装置を備えており、前記脱水装置とＣＯ ２ 吸脱着装置との間に位置する燃焼排ガス系統から前記混合用排ガス系統を分岐させ、分岐した燃焼排ガスの一部を前記石炭ボイラに供給するように構成し、前記酸素昇温用熱交換器を前記給水加熱器と電気集塵機との間に位置する燃焼排ガス系統に配設し、前記酸素昇温用熱交換器での燃焼排ガスとの熱交換によって昇温した酸素を流下する前記酸素供給系統をエアヒータより上流側に位置する前記混合用排ガス系統に接続させて酸素と燃焼排ガスとのガス混合部を設け、前記ガス混合部によって酸素と燃焼排ガスとを混合させた支燃ガスを所望の温度に昇温させることを特徴とする。
また本発明の酸素燃焼型石炭火力発電システムは、石炭を燃焼する石炭ボイラと、空気から酸素を分離させて酸素を発生する酸素製造装置とを備え、前記石炭ボイラから排出された燃焼排ガスを流下させる燃焼排ガス系統と、この燃焼排ガス系統から分岐して前記燃焼排ガスの一部を前記石炭ボイラに供給する混合用排ガス系統と、前記酸素製造装置で発生した酸素を流下させる酸素供給系統を前記混合用排ガス系統と接続して前記酸素供給系統を流れる酸素を前記混合用排ガス系統を流れる燃焼排ガスと混合させて石炭燃焼用の支燃ガスを形成し、前記混合用排ガス系統を通じてこの支焼ガスを前記石炭ボイラに供給するように構成した酸素燃焼型石炭火力発電システムであって、酸素製造装置で発生した酸素を燃焼排ガスによって昇温する酸素昇温用熱交換器を前記燃焼排ガス系統に設置し、酸素を流下させる前記酸素供給系統を前記酸素製造装置からこの酸素昇温用熱交換器を経由して前記混合用排ガス系統に接続するように配設し、前記酸素昇温用熱交換器によって昇温させた酸素を前記混合用排ガス系統を流下する燃焼排ガスと混合させて所望の温度の支焼ガスを形成し、前記混合用排ガス系統を通じてこの支焼ガスを石炭ボイラに供給した酸素燃焼型石炭火力発電システムにおいて、
前記石炭ボイラの下流側に配設した前記燃焼排ガス系統に、燃焼排ガス中の窒素酸化物を除去する脱硝装置と、この脱硝装置の下流側に設置されて該燃焼排ガスと支燃ガスとの熱交換を行うエアヒータと、このエアヒータの下流側に設置されて該燃焼排ガスによりボイラ給水を加熱する給水加熱器と、この給水加熱器の下流側に設置されて燃焼排ガス中の灰を除去する電気集塵機と、この電気集塵機の下流側に設置されて燃焼排ガス中の硫黄酸化物を除去する脱硫装置と、この脱硫装置の下流側に設置されて燃焼排ガス中の水分を除去する脱水装置と、この脱水装置の下流側に設置されて燃焼排ガス中のＣＯ ２ を回収するＣＯ ２ 吸脱着装置を備えており、前記脱水装置とＣＯ ２ 吸脱着装置との間に位置する燃焼排ガス系統から前記混合用排ガス系統を分岐させ、分岐した燃焼排ガスの一部を前記石炭ボイラに供給するように構成し、前記酸素昇温用熱交換器を前記給水加熱器と電気集塵機との間に位置する燃焼排ガス系統に配設し、前記酸素昇温用熱交換器での燃焼排ガスとの熱交換によって昇温した酸素を流下する前記酸素供給系統をエアヒータより上流側に位置する前記混合用排ガス系統に接続させて酸素と燃焼排ガスとのガス混合部を設け、前記ガス混合部によって酸素と燃焼排ガスとを混合させた支燃ガスを所望の温度に昇温させることを特徴とする。
また本発明の酸素燃焼型石炭火力発電システムは、石炭を燃焼する石炭ボイラと、空気から酸素を分離させて酸素を発生する酸素製造装置とを備え、前記石炭ボイラから排出された燃焼排ガスを流下させる燃焼排ガス系統と、この燃焼排ガス系統から分岐して前記燃焼排ガスの一部を前記石炭ボイラに供給する混合用排ガス系統と、前記酸素製造装置で発生した酸素を流下させる酸素供給系統を前記混合用排ガス系統と接続して前記酸素供給系統を流れる酸素を前記混合用排ガス系統を流れる燃焼排ガスと混合させて石炭燃焼用の支燃ガスを形成し、前記混合用排ガス系統を通じてこの支焼ガスを前記石炭ボイラに供給するように構成した酸素燃焼型石炭火力発電システムであって、酸素製造装置で発生した酸素を燃焼排ガスによって昇温する酸素昇温用熱交換器を前記燃焼排ガス系統に設置し、酸素を流下させる前記酸素供給系統を前記酸素製造装置からこの酸素昇温用熱交換器を経由して前記混合用排ガス系統に接続するように配設し、前記酸素昇温用熱交換器によって昇温させた酸素を前記混合用排ガス系統を流下する燃焼排ガスと混合させて所望の温度の支焼ガスを形成し、前記混合用排ガス系統を通じてこの支焼ガスを石炭ボイラに供給した酸素燃焼型石炭火力発電システムにおいて、
前記石炭ボイラの下流側に配設した前記燃焼排ガス系統に、燃焼排ガス中の窒素酸化物を除去する脱硝装置と、この脱硝装置の下流側に設置されて該燃焼排ガスと支燃ガスとの熱交換を行うエアヒータと、このエアヒータの下流側に設置されて該燃焼排ガスによりボイラ給水を加熱する給水加熱器と、この給水加熱器の下流側に設置されて燃焼排ガス中の灰を除去する電気集塵機と、この電気集塵機の下流側に設置されて燃焼排ガス中の硫黄酸化物を除去する脱硫装置とを備えており、前記電気集塵機と脱硫装置との間に位置する燃焼排ガス系統から前記混合用排ガス系統を分岐させ、分岐した燃焼排ガスの一部を前記石炭ボイラに供給するように構成し、前記酸素昇温用熱交換器を前記エアヒータと給水加熱器との間に位置する燃焼排ガス系統に配設し、前記酸素昇温用熱交換器での燃焼排ガスとの熱交換によって昇温した酸素を流下する前記酸素供給系統をエアヒータより上流側に位置する前記混合用排ガス系統に接続させて酸素と燃焼排ガスとのガス混合部を設け、前記ガス混合部によって酸素と燃焼排ガスとを混合させた支燃ガスを所望の温度に昇温させることを特徴とする。
また本発明の酸素燃焼型石炭火力発電システムは、石炭を燃焼する石炭ボイラと、空気から酸素を分離させて酸素を発生する酸素製造装置とを備え、前記石炭ボイラから排出された燃焼排ガスを流下させる燃焼排ガス系統と、この燃焼排ガス系統から分岐して前記燃焼排ガスの一部を前記石炭ボイラに供給する混合用排ガス系統と、前記酸素製造装置で発生した酸素を流下させる酸素供給系統を前記混合用排ガス系統と接続して前記酸素供給系統を流れる酸素を前記混合用排ガス系統を流れる燃焼排ガスと混合させて石炭燃焼用の支燃ガスを形成し、前記混合用排ガス系統を通じてこの支焼ガスを前記石炭ボイラに供給するように構成した酸素燃焼型石炭火力発電システムであって、酸素製造装置で発生した酸素を燃焼排ガスによって昇温する酸素昇温用熱交換器を前記燃焼排ガス系統に設置し、酸素を流下させる前記酸素供給系統を前記酸素製造装置からこの酸素昇温用熱交換器を経由して前記混合用排ガス系統に接続するように配設し、前記酸素昇温用熱交換器によって昇温させた酸素を前記混合用排ガス系統を流下する燃焼排ガスと混合させて所望の温度の支焼ガスを形成し、前記混合用排ガス系統を通じてこの支焼ガスを石炭ボイラに供給した酸素燃焼型石炭火力発電システムにおいて、
前記石炭ボイラの下流側に配設した前記燃焼排ガス系統に、燃焼排ガス中の窒素酸化物を除去する脱硝装置と、この脱硝装置の下流側に設置されて該燃焼排ガスと支燃ガスとの熱交換を行うエアヒータと、このエアヒータの下流側に設置されて該燃焼排ガスによりボイラ給水を加熱する給水加熱器と、この給水加熱器の下流側に設置されて燃焼排ガス中の灰を除去する電気集塵機と、この電気集塵機の下流側に設置されて燃焼排ガス中の硫黄酸化物を除去する脱硫装置とを備えており、前記電気集塵機と脱硫装置との間に位置する燃焼排ガス系統から前記混合用排ガス系統を分岐させ、分岐した燃焼排ガスの一部を前記石炭ボイラに供給するように構成し、前記酸素昇温用熱交換器を前記給水加熱器と電気集塵機との間に位置する燃焼排ガス系統に配設し、前記酸素昇温用熱交換器での燃焼排ガスとの熱交換によって昇温した酸素を流下する前記酸素供給系統をエアヒータより上流側に位置する前記混合用排ガス系統に接続させて酸素と燃焼排ガスとのガス混合部を設け、前記ガス混合部によって酸素と燃焼排ガスとを混合させた支燃ガスを所望の温度に昇温させることを特徴とする。 An oxyfuel-type coal-fired power generation system according to the present invention includes a coal boiler that burns coal, and an oxygen production apparatus that generates oxygen by separating oxygen from air, and causes combustion exhaust gas discharged from the coal boiler to flow down. A combustion exhaust gas system, a mixing exhaust gas system that branches from the combustion exhaust gas system and supplies a part of the combustion exhaust gas to the coal boiler, and an oxygen supply system that flows down oxygen generated in the oxygen production apparatus Combustion exhaust gas flowing through the mixing exhaust gas system is mixed with oxygen flowing through the oxygen supply system connected to the exhaust gas system to form a combustion combustion supporting gas for coal combustion, and the combustion combustion gas is passed through the mixing exhaust gas system. In an oxyfuel coal-fired thermal power generation system configured to be supplied to a coal boiler, an acid that raises the temperature of oxygen generated by an oxygen production device using combustion exhaust gas A heat exchanger for raising temperature is installed in the combustion exhaust gas system, and the oxygen supply system for letting oxygen flow down is connected from the oxygen production apparatus to the exhaust gas system for mixing via this oxygen temperature raising heat exchanger. The mixed exhaust gas system is formed by mixing the oxygen heated by the oxygen temperature raising heat exchanger with the combustion exhaust gas flowing down the mixing exhaust gas system to form a combustion gas having a desired temperature. To supply this combustion gas to the coal boiler,
A denitration device that removes nitrogen oxides in the combustion exhaust gas and a heat of the combustion exhaust gas and the combustion support gas that are installed downstream of the denitration device in the combustion exhaust gas system disposed on the downstream side of the coal boiler. An air heater that performs replacement, a feed water heater that is installed on the downstream side of the air heater and heats boiler feed water with the combustion exhaust gas, and an electric dust collector that is installed on the downstream side of the feed water heater and removes ash in the combustion exhaust gas A desulfurization device installed downstream of the electric dust collector to remove sulfur oxides in the combustion exhaust gas, a dehydration device installed downstream of the desulfurization device to remove moisture in the combustion exhaust gas, and the dehydration device has a CO 2 adsorption-desorption apparatus being disposed downstream to recover the CO 2 in the combustion exhaust gas of the apparatus, waste for the mixing of flue gas line located between the dewatering device and the CO 2 adsorption-desorption apparatus And a part of the branched flue gas is supplied to the coal boiler, and the oxygen temperature raising heat exchanger is connected to the flue gas line located between the electric dust collector and the desulfurizer. The oxygen supply system is arranged to connect the oxygen supply system for flowing down the oxygen heated by the heat exchange with the combustion exhaust gas in the oxygen temperature increasing heat exchanger to the mixing exhaust gas system located upstream from the air heater to And a combustion mixing gas of combustion exhaust gas is provided, and the combustion supporting gas in which oxygen and combustion exhaust gas are mixed by the gas mixing unit is heated to a desired temperature .
Moreover, the oxyfuel-type coal-fired power generation system of the present invention includes a coal boiler that burns coal, and an oxygen production apparatus that generates oxygen by separating oxygen from air, and flows down the combustion exhaust gas discharged from the coal boiler. A combustion exhaust gas system, a mixing exhaust gas system that branches from the combustion exhaust gas system and supplies a part of the combustion exhaust gas to the coal boiler, and an oxygen supply system that causes oxygen generated in the oxygen production apparatus to flow down. The oxygen flowing through the oxygen supply system connected to the exhaust gas system is mixed with the combustion exhaust gas flowing through the mixing exhaust gas system to form a combustion supporting gas for coal combustion. An oxyfuel combustion type coal-fired power generation system configured to supply to the coal boiler, wherein oxygen generated in an oxygen production device is heated by combustion exhaust gas An oxygen temperature raising heat exchanger is installed in the combustion exhaust gas system, and the oxygen supply system for flowing down oxygen is connected from the oxygen production apparatus to the mixing exhaust gas system via the oxygen temperature raising heat exchanger. The mixed exhaust gas is mixed with the combustion exhaust gas flowing down the mixing exhaust gas system to form oxygen that has been heated by the oxygen temperature increasing heat exchanger, and the mixing exhaust gas. In the oxy-combustion type coal-fired power generation system that supplies this combustion gas to the coal boiler through the system,
A denitration device that removes nitrogen oxides in the combustion exhaust gas and a heat of the combustion exhaust gas and the combustion support gas that are installed downstream of the denitration device in the combustion exhaust gas system disposed on the downstream side of the coal boiler. An air heater that performs replacement, a feed water heater that is installed on the downstream side of the air heater and heats boiler feed water with the combustion exhaust gas, and an electric dust collector that is installed on the downstream side of the feed water heater and removes ash in the combustion exhaust gas A desulfurization device installed downstream of the electric dust collector to remove sulfur oxides in the combustion exhaust gas, a dehydration device installed downstream of the desulfurization device to remove moisture in the combustion exhaust gas, and the dehydration device has a CO 2 adsorption-desorption apparatus being disposed downstream to recover the CO 2 in the combustion exhaust gas of the apparatus, waste for the mixing of flue gas line located between the dewatering device and the CO 2 adsorption-desorption apparatus And a part of the branched flue gas is supplied to the coal boiler, and the heat exchanger for raising the temperature of the oxygen is connected to the flue gas line located between the air heater and the feed water heater. The oxygen supply system is arranged to connect the oxygen supply system for flowing down the oxygen heated by the heat exchange with the combustion exhaust gas in the oxygen temperature increasing heat exchanger to the mixing exhaust gas system located upstream from the air heater to And a combustion mixing gas of combustion exhaust gas is provided, and the combustion supporting gas in which oxygen and combustion exhaust gas are mixed by the gas mixing unit is heated to a desired temperature .
Moreover, the oxyfuel-type coal-fired power generation system of the present invention includes a coal boiler that burns coal, and an oxygen production apparatus that generates oxygen by separating oxygen from air, and flows down the combustion exhaust gas discharged from the coal boiler. A combustion exhaust gas system, a mixing exhaust gas system that branches from the combustion exhaust gas system and supplies a part of the combustion exhaust gas to the coal boiler, and an oxygen supply system that causes oxygen generated in the oxygen production apparatus to flow down. The oxygen flowing through the oxygen supply system connected to the exhaust gas system is mixed with the combustion exhaust gas flowing through the mixing exhaust gas system to form a combustion supporting gas for coal combustion. An oxyfuel combustion type coal-fired power generation system configured to supply to the coal boiler, wherein oxygen generated in an oxygen production device is heated by combustion exhaust gas An oxygen temperature raising heat exchanger is installed in the combustion exhaust gas system, and the oxygen supply system for flowing down oxygen is connected from the oxygen production apparatus to the mixing exhaust gas system via the oxygen temperature raising heat exchanger. The mixed exhaust gas is mixed with the combustion exhaust gas flowing down the mixing exhaust gas system to form oxygen that has been heated by the oxygen temperature increasing heat exchanger, and the mixing exhaust gas. In the oxy-combustion type coal-fired power generation system that supplies this combustion gas to the coal boiler through the system,
A denitration device that removes nitrogen oxides in the combustion exhaust gas and a heat of the combustion exhaust gas and the combustion support gas that are installed downstream of the denitration device in the combustion exhaust gas system disposed on the downstream side of the coal boiler. An air heater that performs replacement, a feed water heater that is installed on the downstream side of the air heater and heats boiler feed water with the combustion exhaust gas, and an electric dust collector that is installed on the downstream side of the feed water heater and removes ash in the combustion exhaust gas A desulfurization device installed downstream of the electric dust collector to remove sulfur oxides in the combustion exhaust gas, a dehydration device installed downstream of the desulfurization device to remove moisture in the combustion exhaust gas, and the dehydration device has a CO 2 adsorption-desorption apparatus being disposed downstream to recover the CO 2 in the combustion exhaust gas of the apparatus, waste for the mixing of flue gas line located between the dewatering device and the CO 2 adsorption-desorption apparatus A combustion exhaust gas system in which a part of the combustion exhaust gas is branched and a part of the branched combustion exhaust gas is supplied to the coal boiler, and the oxygen temperature raising heat exchanger is located between the feed water heater and the electric dust collector The oxygen supply system that flows down oxygen that has been heated by heat exchange with the combustion exhaust gas in the oxygen temperature increasing heat exchanger is connected to the mixing exhaust gas system that is located upstream of the air heater. A gas mixing part of oxygen and combustion exhaust gas is provided, and the combustion supporting gas in which oxygen and combustion exhaust gas are mixed by the gas mixing part is heated to a desired temperature .
Moreover, the oxyfuel-type coal-fired power generation system of the present invention includes a coal boiler that burns coal, and an oxygen production apparatus that generates oxygen by separating oxygen from air, and flows down the combustion exhaust gas discharged from the coal boiler. A combustion exhaust gas system, a mixing exhaust gas system that branches from the combustion exhaust gas system and supplies a part of the combustion exhaust gas to the coal boiler, and an oxygen supply system that causes oxygen generated in the oxygen production apparatus to flow down. The oxygen flowing through the oxygen supply system connected to the exhaust gas system is mixed with the combustion exhaust gas flowing through the mixing exhaust gas system to form a combustion supporting gas for coal combustion. An oxyfuel combustion type coal-fired power generation system configured to supply to the coal boiler, wherein oxygen generated in an oxygen production device is heated by combustion exhaust gas An oxygen temperature raising heat exchanger is installed in the combustion exhaust gas system, and the oxygen supply system for flowing down oxygen is connected from the oxygen production apparatus to the mixing exhaust gas system via the oxygen temperature raising heat exchanger. The mixed exhaust gas is mixed with the combustion exhaust gas flowing down the mixing exhaust gas system to form oxygen that has been heated by the oxygen temperature increasing heat exchanger, and the mixing exhaust gas. In the oxy-combustion type coal-fired power generation system that supplies this combustion gas to the coal boiler through the system,
A denitration device that removes nitrogen oxides in the combustion exhaust gas and a heat of the combustion exhaust gas and the combustion support gas that are installed downstream of the denitration device in the combustion exhaust gas system disposed on the downstream side of the coal boiler. An air heater that performs replacement, a feed water heater that is installed on the downstream side of the air heater and heats boiler feed water with the combustion exhaust gas, and an electric dust collector that is installed on the downstream side of the feed water heater and removes ash in the combustion exhaust gas A desulfurization device installed downstream of the electric dust collector to remove sulfur oxides in the combustion exhaust gas, a dehydration device installed downstream of the desulfurization device to remove moisture in the combustion exhaust gas, and the dehydration device has a CO 2 adsorption-desorption apparatus being disposed downstream to recover the CO 2 in the combustion exhaust gas of the apparatus, waste for the mixing of flue gas line located between the dewatering device and the CO 2 adsorption-desorption apparatus A combustion exhaust gas system in which a part of the combustion exhaust gas is branched and a part of the branched combustion exhaust gas is supplied to the coal boiler, and the oxygen temperature raising heat exchanger is located between the feed water heater and the electric dust collector The oxygen supply system that flows down oxygen that has been heated by heat exchange with the combustion exhaust gas in the oxygen temperature increasing heat exchanger is connected to the mixing exhaust gas system that is located upstream of the air heater. A gas mixing part of oxygen and combustion exhaust gas is provided, and the combustion supporting gas in which oxygen and combustion exhaust gas are mixed by the gas mixing part is heated to a desired temperature .
Moreover, the oxyfuel-type coal-fired power generation system of the present invention includes a coal boiler that burns coal, and an oxygen production apparatus that generates oxygen by separating oxygen from air, and flows down the combustion exhaust gas discharged from the coal boiler. A combustion exhaust gas system, a mixing exhaust gas system that branches from the combustion exhaust gas system and supplies a part of the combustion exhaust gas to the coal boiler, and an oxygen supply system that causes oxygen generated in the oxygen production apparatus to flow down. The oxygen flowing through the oxygen supply system connected to the exhaust gas system is mixed with the combustion exhaust gas flowing through the mixing exhaust gas system to form a combustion supporting gas for coal combustion. An oxyfuel combustion type coal-fired power generation system configured to supply to the coal boiler, wherein oxygen generated in an oxygen production device is heated by combustion exhaust gas An oxygen temperature raising heat exchanger is installed in the combustion exhaust gas system, and the oxygen supply system for flowing down oxygen is connected from the oxygen production apparatus to the mixing exhaust gas system via the oxygen temperature raising heat exchanger. The mixed exhaust gas is mixed with the combustion exhaust gas flowing down the mixing exhaust gas system to form oxygen that has been heated by the oxygen temperature increasing heat exchanger, and the mixing exhaust gas. In the oxy-combustion type coal-fired power generation system that supplies this combustion gas to the coal boiler through the system,
A denitration device that removes nitrogen oxides in the combustion exhaust gas and a heat of the combustion exhaust gas and the combustion support gas that are installed downstream of the denitration device in the combustion exhaust gas system disposed on the downstream side of the coal boiler. An air heater that performs replacement, a feed water heater that is installed on the downstream side of the air heater and heats boiler feed water with the combustion exhaust gas, and an electric dust collector that is installed on the downstream side of the feed water heater and removes ash in the combustion exhaust gas And a desulfurization device installed on the downstream side of the electric dust collector to remove sulfur oxides in the combustion exhaust gas, and the exhaust gas for mixing from the combustion exhaust gas system located between the electric dust collector and the desulfurization device Combustion exhaust gas configured to branch the system and supply a part of the branched combustion exhaust gas to the coal boiler, and the heat exchanger for raising the oxygen temperature is located between the air heater and the feed water heater The oxygen supply system, which is arranged in a row and flows down oxygen heated by heat exchange with the combustion exhaust gas in the oxygen temperature increasing heat exchanger, is connected to the mixing exhaust gas system located upstream from the air heater. A gas mixing part of oxygen and combustion exhaust gas is provided, and the combustion supporting gas in which oxygen and combustion exhaust gas are mixed by the gas mixing part is heated to a desired temperature .
Moreover, the oxyfuel-type coal-fired power generation system of the present invention includes a coal boiler that burns coal, and an oxygen production apparatus that generates oxygen by separating oxygen from air, and flows down the combustion exhaust gas discharged from the coal boiler. A combustion exhaust gas system, a mixing exhaust gas system that branches from the combustion exhaust gas system and supplies a part of the combustion exhaust gas to the coal boiler, and an oxygen supply system that causes oxygen generated in the oxygen production apparatus to flow down. The oxygen flowing through the oxygen supply system connected to the exhaust gas system is mixed with the combustion exhaust gas flowing through the mixing exhaust gas system to form a combustion supporting gas for coal combustion. An oxyfuel combustion type coal-fired power generation system configured to supply to the coal boiler, wherein oxygen generated in an oxygen production device is heated by combustion exhaust gas An oxygen temperature raising heat exchanger is installed in the combustion exhaust gas system, and the oxygen supply system for flowing down oxygen is connected from the oxygen production apparatus to the mixing exhaust gas system via the oxygen temperature raising heat exchanger. The mixed exhaust gas is mixed with the combustion exhaust gas flowing down the mixing exhaust gas system to form oxygen that has been heated by the oxygen temperature increasing heat exchanger, and the mixing exhaust gas. In the oxy-combustion type coal-fired power generation system that supplies this combustion gas to the coal boiler through the system,
A denitration device that removes nitrogen oxides in the combustion exhaust gas and a heat of the combustion exhaust gas and the combustion support gas that are installed downstream of the denitration device in the combustion exhaust gas system disposed on the downstream side of the coal boiler. An air heater that performs replacement, a feed water heater that is installed on the downstream side of the air heater and heats boiler feed water with the combustion exhaust gas, and an electric dust collector that is installed on the downstream side of the feed water heater and removes ash in the combustion exhaust gas And a desulfurization device installed on the downstream side of the electric dust collector to remove sulfur oxides in the combustion exhaust gas, and the exhaust gas for mixing from the combustion exhaust gas system located between the electric dust collector and the desulfurization device Combustion exhaust gas configured to branch the system and supply a part of the branched combustion exhaust gas to the coal boiler, and the heat exchanger for raising the oxygen temperature is located between the feed water heater and the electric dust collector The oxygen supply system, which is arranged in a row and flows down oxygen heated by heat exchange with the combustion exhaust gas in the oxygen temperature increasing heat exchanger, is connected to the mixing exhaust gas system located upstream from the air heater. A gas mixing part of oxygen and combustion exhaust gas is provided, and the combustion supporting gas in which oxygen and combustion exhaust gas are mixed by the gas mixing part is heated to a desired temperature .

本発明によれば、酸素燃焼型石炭火力発電システムの熱効率を向上させると共に、石炭ボイラから排出される燃焼排ガス中の凝縮水の発生、及び凝縮水への硫黄酸化物の溶解による酸性水の発生を抑制して火力発電システムの系統を構成する配管材料の腐食を未然に防止し得るようにした酸素燃焼型石炭火力発電システムが実現できる。   ADVANTAGE OF THE INVENTION According to this invention, while improving the thermal efficiency of an oxyfuel type | mold coal thermal power generation system, generation | occurrence | production of the condensed water in the combustion exhaust gas discharged | emitted from a coal boiler, and the generation | occurrence | production of acidic water by melt | dissolution of the sulfur oxide to condensed water It is possible to realize an oxyfuel-type coal-fired power generation system that can prevent corrosion of piping materials constituting the system of the thermal power generation system by suppressing the above.

本発明の第１実施例である酸素燃焼型石炭火力発電システムを示す概略構成図。BRIEF DESCRIPTION OF THE DRAWINGS The schematic block diagram which shows the oxyfuel type | mold coal thermal power generation system which is 1st Example of this invention. 本発明の第２実施例である酸素燃焼型石炭火力発電システムを示す概略構成図。The schematic block diagram which shows the oxyfuel type | mold coal-fired power generation system which is 2nd Example of this invention. 本発明の第３実施例である酸素燃焼型石炭火力発電システムを示す概略構成図。The schematic block diagram which shows the oxyfuel type | mold coal thermal power generation system which is 3rd Example of this invention. 本発明の第４実施例である酸素燃焼型石炭火力発電システムを示す概略構成図。The schematic block diagram which shows the oxyfuel type | mold coal thermal power generation system which is 4th Example of this invention. 本発明の第５実施例である酸素燃焼型石炭火力発電システムを示す概略構成図。The schematic block diagram which shows the oxyfuel type | mold coal thermal power generation system which is 5th Example of this invention. 本発明の第６実施例である酸素燃焼型石炭火力発電システムを示す概略構成図。The schematic block diagram which shows the oxyfuel type | mold coal thermal power generation system which is 6th Example of this invention. 比較例の酸素燃焼型石炭火力発電システムにおける排ガス処理系統の温度変化状況図。The temperature change situation figure of the exhaust gas treatment system in the oxygen combustion type coal thermal power generation system of a comparative example. 本発明の第４実施例の酸素燃焼型石炭火力発電システムにおける排ガス処理系統の温度変化状況図。The temperature change condition figure of the exhaust gas treatment system in the oxygen combustion type coal thermal power generation system of the 4th example of the present invention. 本発明の実施例と比較例の酸素燃焼型石炭火力発電システムにおける排ガス処理系統における熱損失状況図。The heat loss situation figure in the exhaust gas treatment system in the oxygen combustion type coal thermal power generation system of the example of the present invention, and a comparative example.

本発明の実施例である酸素燃焼型石炭火力発電システムについて図面を引用して以下に説明する。   An oxygen combustion type coal thermal power generation system which is an embodiment of the present invention will be described below with reference to the drawings.

本発明の第１実施例の酸素燃焼型石炭火力発電システムについて図１を用いて説明する。     An oxygen combustion type coal-fired power generation system according to a first embodiment of the present invention will be described with reference to FIG.

図１は本発明の第１実施例である酸素燃焼型石炭火力発電システムを示す概略構成図である。   FIG. 1 is a schematic configuration diagram showing an oxyfuel coal-fired power generation system according to a first embodiment of the present invention.

図１に示した本実施例の酸素燃焼型石炭火力発電システムは、石炭を燃焼して高温の燃焼ガスを発生させる石炭ボイラ１を備えている。   The oxyfuel combustion type coal-fired power generation system of the present embodiment shown in FIG. 1 includes a coal boiler 1 that burns coal and generates high-temperature combustion gas.

この石炭ボイラ１では発生させた高温の燃焼ガスによって該石炭ボイラ１に設けた熱交換器（図示せず）で蒸気タービン（図示せず）に供給する蒸気を発生させている。   In the coal boiler 1, steam to be supplied to a steam turbine (not shown) is generated by a heat exchanger (not shown) provided in the coal boiler 1 by the generated high-temperature combustion gas.

前記石炭ボイラ１からは約４００℃となった燃焼排ガスが排出されるが、この石炭ボイラ１から排出された燃焼排ガスが流下する該石炭ボイラ１の下流側の燃焼排ガス系統２１には、燃焼排ガスに含まれた窒素酸化物を除去する脱硝装置２と、石炭ボイラ１にから排出された燃焼排ガスの熱により昇温させるエアヒータ（以下、Ａ／Ｈと記す）３と、石炭ボイラ１に供給する蒸気発生用の給水を燃焼排ガスの熱により昇温させる給水加熱器５と、燃焼排ガス中の灰を除去する乾式電気集塵機６と、酸素製造装置１２で製造された酸素を燃焼排ガスの熱により温度に昇温する酸素昇温用熱交換器４とが順次設置されている。   Combustion exhaust gas having a temperature of about 400 ° C. is discharged from the coal boiler 1. The combustion exhaust gas system 21 on the downstream side of the coal boiler 1 from which the combustion exhaust gas discharged from the coal boiler 1 flows down has combustion exhaust gas. A denitration device 2 for removing nitrogen oxides contained in the gas, an air heater (hereinafter referred to as A / H) 3 for raising the temperature by the heat of the combustion exhaust gas discharged from the coal boiler 1, and a coal boiler 1 The feed water heater 5 for raising the temperature of the feed water for generating steam by the heat of the combustion exhaust gas, the dry electrostatic precipitator 6 for removing ash in the combustion exhaust gas, and the temperature of the oxygen produced by the oxygen production device 12 by the heat of the combustion exhaust gas A heat exchanger 4 for raising the temperature of oxygen is sequentially installed.

前記酸素昇温用熱交換器４の下流側の燃焼排ガス系統２１には、該酸素昇温用熱交換器４を流下した燃焼排ガスに含まれる硫黄分を除去する脱硫装置７と、燃焼排ガス中の塵芥物を除去する湿式電気集塵機８と、燃焼排ガス中に含まれる水分を除去する脱水装置９が順次設置され、この脱水装置９の下流側の燃焼排ガス系統２１に燃焼排ガスに含まれる二酸化炭素を回収するＣＯ２吸脱着装置１０が設置され、前記ＣＯ２吸脱着装置１０の下流側の燃焼排ガス系統２１に該ＣＯ２吸脱着装置１０によって二酸化炭素を回収された燃焼排ガスを大気中に排出する煙突１１が設置されている。 A combustion exhaust gas system 21 on the downstream side of the oxygen temperature raising heat exchanger 4 includes a desulfurizer 7 for removing sulfur contained in the combustion exhaust gas flowing down the oxygen temperature raising heat exchanger 4, and A wet-type electrostatic precipitator 8 for removing the dust and a dehydrator 9 for removing moisture contained in the combustion exhaust gas are sequentially installed, and carbon dioxide contained in the combustion exhaust gas is disposed in the combustion exhaust gas system 21 on the downstream side of the dehydrator 9. CO 2 adsorption-desorption apparatus 10 for collecting is installed, discharging the combustion exhaust gas recovered carbon dioxide by the CO 2 adsorption-desorption apparatus 10 to the combustion exhaust gas line 21 on the downstream side of the CO 2 adsorption-desorption apparatus 10 into the atmosphere A chimney 11 is installed.

前記脱水装置９の下流側となる該脱水装置９とＣＯ２吸脱着装置１０との間の燃焼排ガス系統２１の途中から分岐して燃焼排ガスの一部を石炭ボイラ１に供給する混合用排ガス系統１５が配設されている。 An exhaust gas system for mixing that branches from the middle of the combustion exhaust gas system 21 between the dehydration device 9 and the CO 2 adsorption / desorption device 10 on the downstream side of the dehydration device 9 and supplies a part of the combustion exhaust gas to the coal boiler 1. 15 is disposed.

前記酸素昇温用熱交換器４に酸素を供給するため、空気１３から酸素を分離して支燃ガス用の酸素を製造する酸素製造装置１２が設置されている。   In order to supply oxygen to the oxygen temperature raising heat exchanger 4, an oxygen production device 12 for separating oxygen from the air 13 and producing oxygen for combustion support gas is installed.

前記酸素製造装置１２で製造された酸素を燃焼排ガスの熱により温度に昇温する酸素昇温用熱交換器４は、前記乾式電気集塵機６と脱硫装置７との間の燃焼排ガス流路に設置されているので、前記酸素製造装置１２で発生した約３０℃の酸素は燃焼排ガス系統２１に設置した前記酸素昇温用熱交換器４に供給して燃焼排ガスと熱交換されて約５０℃に昇温した後に酸素供給系統１４を通じて流下し、前記Ａ／Ｈ３の上流側にて前記酸素供給系統１４を前記混合用排ガス系統１５と接続させて、酸素と燃焼排ガスとが混合する混合部２０を設けることにより、酸素供給系統１４を流下する昇温した酸素によって前記混合用排ガス系統１５を流下する燃焼排ガスを昇温させて前記混合部２０にて酸素と燃焼排ガスとが混合した所望の温度の支燃ガスを形成するようになっている。   An oxygen temperature raising heat exchanger 4 that raises the temperature of oxygen produced by the oxygen production device 12 to the temperature of the combustion exhaust gas is installed in the combustion exhaust gas passage between the dry electrostatic precipitator 6 and the desulfurization device 7. Therefore, the oxygen of about 30 ° C. generated in the oxygen production device 12 is supplied to the oxygen temperature raising heat exchanger 4 installed in the combustion exhaust gas system 21 and is heat-exchanged with the combustion exhaust gas to about 50 ° C. After the temperature rises, it flows down through the oxygen supply system 14, and the oxygen supply system 14 is connected to the mixing exhaust gas system 15 on the upstream side of the A / H 3 to mix the mixing unit 20 in which oxygen and combustion exhaust gas are mixed. By providing the temperature of the combustion exhaust gas flowing down the mixing exhaust gas system 15 with the heated oxygen flowing down the oxygen supply system 14, the mixing unit 20 mixes oxygen and combustion exhaust gas at a desired temperature. Combustion support So as to form a.

前記酸素製造装置１２で発生した低温の酸素は前記酸素昇温用熱交換器４によって昇温されるが、昇温される酸素の温度は、酸素昇温用熱交換器４で昇温した酸素を供給する前記酸素供給系統１４がＡ／Ｈ３の上流側に位置する前記混合部２０にて前記混合用排ガス系統１５と接続していることから、この混合用排ガス系統１５を通じて供給される分岐した燃焼排ガスの温度とほぼ同じ温度となるように前記酸素昇温用熱交換器４によって昇温される。   The low temperature oxygen generated in the oxygen production apparatus 12 is heated by the oxygen temperature raising heat exchanger 4, and the temperature of the raised oxygen is the oxygen temperature raised by the oxygen temperature raising heat exchanger 4. Since the oxygen supply system 14 for supplying the gas is connected to the mixing exhaust gas system 15 at the mixing unit 20 located upstream of the A / H 3, it is branched through the mixing exhaust gas system 15. The temperature is raised by the oxygen temperature raising heat exchanger 4 so that the temperature becomes substantially the same as the temperature of the combustion exhaust gas.

そして前記酸素供給系統１４を通じて供給された昇温した酸素は混合用排ガス系統１５を通じて供給された分岐した燃焼排ガスと前記混合部２０で混合して石炭燃焼用の支焼ガスを形成し、更にＡ／Ｈ３によって燃焼排ガスの熱により所望の温度に昇温された支焼ガスとなって前記混合用排ガス系統１５を通じて前記石炭ボイラ１に供給される。   The heated oxygen supplied through the oxygen supply system 14 is mixed with the branched combustion exhaust gas supplied through the mixing exhaust gas system 15 in the mixing unit 20 to form a combustion gas for coal combustion. / H3 is supplied to the coal boiler 1 through the mixing exhaust gas system 15 as a combustion gas heated to a desired temperature by the heat of the combustion exhaust gas.

上記のように構成した本実施例の酸素燃焼型石炭火力発電システムにおいては、石炭を燃焼する石炭ボイラ１から排出された約４００℃の高温の燃焼排ガスは、脱硝装置２、石炭ボイラ１に供給する支燃ガスを燃焼排ガスの熱により昇温させるＡ／Ｈ３を通過したのち、石炭ボイラ１に供給する蒸気発生用の給水を燃焼排ガスの熱により昇温させる給水加熱器５、乾式電気集塵機６、及び酸素昇温用熱交換器４を通過することによって、燃焼排ガスの温度を５０℃まで降下させる。   In the oxyfuel coal-fired power generation system of the present embodiment configured as described above, the high-temperature combustion exhaust gas of about 400 ° C. discharged from the coal boiler 1 for burning coal is supplied to the denitration device 2 and the coal boiler 1. After passing through A / H3 which raises the temperature of the combustion supporting gas by the heat of the combustion exhaust gas, the feed water heater 5 which raises the temperature of the steam generation feed water supplied to the coal boiler 1 by the heat of the combustion exhaust gas, and the dry electric dust collector 6 And the temperature of the combustion exhaust gas is lowered to 50 ° C. by passing through the heat exchanger 4 for raising the temperature of oxygen.

給水加熱器５を通過した燃焼排ガスは、乾式電気集塵機６によって燃焼排ガス中の灰を除去して酸素昇温用熱交換器４に供給されて約５０℃まで降下する。   The combustion exhaust gas that has passed through the feed water heater 5 removes the ash in the combustion exhaust gas by the dry electrostatic precipitator 6, is supplied to the oxygen temperature raising heat exchanger 4, and falls to about 50 ° C.

酸素昇温用熱交換器４を通過した燃焼排ガスは、脱硫装置７、湿式電気集塵機８で燃焼排ガス中の硫黄酸化物を除去したのち、脱水装置９で燃焼排ガス中の水分を除去される、
そして前記脱水装置９を通過した燃焼排ガスは、ＣＯ２吸脱着装置１０によって燃焼排ガス中の二酸化炭素を回収され、煙突１１より大気中に排出される。 The combustion exhaust gas that has passed through the oxygen temperature raising heat exchanger 4 removes sulfur oxides in the combustion exhaust gas by the desulfurization device 7 and the wet electrostatic precipitator 8, and then the moisture in the combustion exhaust gas is removed by the dehydration device 9.
The combustion exhaust gas that has passed through the dehydration device 9 is recovered by the CO 2 adsorption / desorption device 10 to recover carbon dioxide in the combustion exhaust gas, and is discharged from the chimney 11 to the atmosphere.

本実施例の酸素燃焼型石炭火力発電システムにおいては、燃焼排ガスの一部は脱水装置９の下流側となる該脱水装置９とＣＯ２吸脱着装置１０との間の燃焼排ガス系統２１から分岐した混合用排ガス系統１５を配設することによって燃焼排ガス系統２１を流下する燃焼排ガスの一部を分岐して混合用排ガス系統１５を通じて石炭ボイラ１に供給する。 In the oxyfuel-type coal-fired power generation system of the present embodiment, a part of the combustion exhaust gas is branched from the combustion exhaust gas system 21 between the dehydrator 9 and the CO 2 adsorption / desorption device 10 on the downstream side of the dehydrator 9. By disposing the mixing exhaust gas system 15, a part of the combustion exhaust gas flowing down the combustion exhaust gas system 21 is branched and supplied to the coal boiler 1 through the mixing exhaust gas system 15.

一方、酸素製造装置１２によって空気１３から製造した３０℃の酸素は、酸素供給系統１４を通じて前記酸素昇温用熱交換器４に供給され、前記酸素昇温用熱交換器４によって燃焼排ガスの熱により５０℃に昇温される。   On the other hand, oxygen at 30 ° C. produced from the air 13 by the oxygen production device 12 is supplied to the oxygen temperature raising heat exchanger 4 through the oxygen supply system 14, and the oxygen temperature raising heat exchanger 4 heats the combustion exhaust gas. The temperature is raised to 50 ° C.

前記酸素昇温用熱交換器４で５０℃に昇温された酸素は、前記酸素供給系統１４がＡ／Ｈ３の上流側の位置にて前記混合用排ガス系統１５と合流することによって燃焼排ガスと混合され、所望温度の石炭燃焼用の支燃ガスを形成して石炭ボイラ１に供給され、石炭を燃焼する支焼ガスとして使用される。   The oxygen heated to 50 ° C. by the oxygen temperature raising heat exchanger 4 is combined with the combustion exhaust gas system 15 when the oxygen supply system 14 joins the exhaust gas system 15 for mixing at a position upstream of A / H 3. It is mixed, forms a combustion support gas for coal combustion at a desired temperature, is supplied to the coal boiler 1, and is used as a combustion combustion gas for burning coal.

本実施例の酸素燃焼型石炭火力発電システムにおいては、混合用排ガス系統１５を配設して燃焼排ガス系統２１から燃焼排ガスの一部を分岐する前記燃焼排ガス系統２１の分岐点が、脱水装置９の下流側で該脱硫装置９とＣＯ２吸脱着装置１０との間となる位置の燃焼排ガス系統２１に設置されているため、燃焼排ガス系統２１を流下する燃焼排ガス中の水分、硫黄酸化物は前記脱硫装置７及び脱水装置９によって既に除去されていることから、燃焼排ガス中の水分凝縮及び凝縮水への硫黄酸化物の溶解による酸性水の発生による火力発電システムの系統を構成する配管材料の腐食は未然に防止できる。 In the oxygen combustion type coal-fired power generation system of the present embodiment, the branch point of the combustion exhaust gas system 21 in which the exhaust gas system 15 for mixing is arranged to branch a part of the combustion exhaust gas from the combustion exhaust gas system 21 is the dehydrator 9. Is located in the combustion exhaust gas system 21 at a position between the desulfurization device 9 and the CO 2 adsorption / desorption device 10 on the downstream side, so that moisture and sulfur oxide in the combustion exhaust gas flowing down the combustion exhaust gas system 21 are Since it has already been removed by the desulfurization device 7 and the dehydration device 9, the piping material constituting the system of the thermal power generation system due to the generation of acidic water due to moisture condensation in the combustion exhaust gas and dissolution of sulfur oxides in the condensed water Corrosion can be prevented beforehand.

本実施例の酸素燃焼型石炭火力発電システムにおいては、酸素昇温用熱交換器４と乾式電気集塵機６を、同一の容器内に設ける構成としても良い。   In the oxygen combustion type coal-fired power generation system of the present embodiment, the oxygen temperature raising heat exchanger 4 and the dry electrostatic precipitator 6 may be provided in the same container.

本実施例の酸素燃焼型石炭火力発電システムでは、脱硫装置７の入口、出口の燃焼排ガスの温度が同等であり、脱硫装置７の水噴霧による燃焼排ガスの温度低下は無い。   In the oxygen combustion type coal-fired power generation system of the present embodiment, the temperature of the combustion exhaust gas at the inlet and the outlet of the desulfurization device 7 is the same, and the temperature of the combustion exhaust gas is not lowered by the water spray of the desulfurization device 7.

本実施例の酸素燃焼型石炭火力発電システムにおける排ガス系統の熱収支では、脱硫装置７で廃棄されていた熱を酸素昇温用熱交換器４で回収されるように構成したことから、酸素燃焼型石炭火力発電システムのシステム熱効率の向上に寄与する。   In the heat balance of the exhaust gas system in the oxygen combustion type coal-fired power generation system of the present embodiment, the heat that has been discarded by the desulfurization device 7 is recovered by the heat exchanger 4 for raising the oxygen temperature. This contributes to the improvement of the system thermal efficiency of the type coal thermal power generation system.

また、酸素製造装置１２で製造した酸素は、酸素昇温用熱交換器４によって燃焼排ガスと熱交換させて混合用排ガス系統１５を流れる分岐された燃焼排ガスと同じ温度に昇温することによって、支燃ガスを形成する酸素と分岐された燃焼排ガスとが合流した際の温度変化がなく、前記燃焼排ガス中の水分凝縮と酸性水の発生が防止されるため、火力発電システムの系統を構成する配管材料の腐食を防止することができる。   Further, the oxygen produced by the oxygen production apparatus 12 is heated to the same temperature as the branched combustion exhaust gas flowing through the mixing exhaust gas system 15 by heat exchange with the combustion exhaust gas by the oxygen temperature raising heat exchanger 4, There is no temperature change when oxygen forming the combustion-supporting gas and the branched flue gas merge, and moisture condensation in the flue gas and generation of acidic water are prevented, thus constituting a system of thermal power generation system Corrosion of the piping material can be prevented.

また、本実施例の酸素燃焼型石炭火力発電システムでは、脱水装置９の下流側で、脱水装置９とＣＯ２吸脱着装置１０との間の燃焼排ガス系統２１から混合用排ガス系統１５を通じて燃焼排ガスを分岐させて石炭ボイラ１に供給しているので、前記脱水装置９で燃焼排ガス中から脱水させた水分の量だけ石炭ボイラ１に供給する燃焼排ガスの容量を減少させることが可能となる。 Further, in the oxyfuel coal-fired power generation system of the present embodiment, the combustion exhaust gas from the combustion exhaust gas system 21 between the dehydration device 9 and the CO 2 adsorption / desorption device 10 through the mixing exhaust gas system 15 on the downstream side of the dehydration device 9. Therefore, the capacity of the combustion exhaust gas supplied to the coal boiler 1 can be reduced by the amount of water dehydrated from the combustion exhaust gas by the dehydrator 9.

次に、本実施例の酸素燃焼型石炭火力発電システムの熱効率の向上について比較例の酸素燃焼型石炭火力発電システムと比較して説明すると以下の通りとなります。   Next, the improvement of the thermal efficiency of the oxyfuel coal-fired power generation system of the present embodiment will be described as follows in comparison with the oxyfuel coal-fired power generation system of the comparative example.

図７及び図８は図１に示した本発明の実施例の酸素燃焼型石炭火力発電システムにおける排ガス処理系統の温度変化状況を比較例の酸素燃焼型石炭火力発電システムの排ガス処理系統の温度変化状況と比較して示したものである。   FIGS. 7 and 8 show the temperature change of the exhaust gas treatment system in the oxyfuel coal-fired power generation system of the embodiment of the present invention shown in FIG. It is shown in comparison with the situation.

図７及び図８に示したこれらの酸素燃焼型石炭火力発電システムの排ガス処理系統の温度変化状況から明らかなように、本実施例における排ガス処理系統では酸素昇温用熱交換器４によって脱硫装置７より上流側で燃焼排ガスの廃熱を回収しているので、比較例の排ガス処理系統では脱硫装置で廃棄していた熱が有効利用されていることを示している。   As is apparent from the temperature change state of the exhaust gas treatment system of these oxygen combustion type coal-fired power generation systems shown in FIGS. 7 and 8, in the exhaust gas treatment system in this embodiment, the desulfurization apparatus is operated by the oxygen temperature raising heat exchanger 4. Since the waste heat of the combustion exhaust gas is recovered upstream from 7, the heat exhausted from the desulfurization apparatus is effectively utilized in the exhaust gas treatment system of the comparative example.

図９に本発明の実施例の酸素燃焼型石炭火力発電システムにおける排ガス処理系統の熱損失、及び比較例の酸素燃焼型石炭火力発電システムにおける排ガス処理系統の熱損失とを試算して比較して示した。   FIG. 9 compares the heat loss of the exhaust gas treatment system in the oxyfuel coal-fired power generation system of the embodiment of the present invention and the heat loss of the exhaust gas treatment system in the oxyfuel coal-fired power generation system of the comparative example. Indicated.

図９に示した両者の熱損失の試算例から明らかなように、比較Ａ／Ｈ出口排ガスの保有熱を１００％とすると、比較例のシステムでは４．１％の熱を廃棄している。   As is clear from the calculation example of the heat loss of both shown in FIG. 9, assuming that the retained heat of the comparative A / H outlet exhaust gas is 100%, the system of the comparative example discards 4.1% of heat.

これに対して本実施例の酸素燃焼型石炭火力発電システムにおいては、廃棄熱を１．２％まで大幅に減少させることができるため、両者の差の２．９％の熱を有効に回収して再利用され、本実施例の酸素燃焼型石炭火力発電システムの熱効率向上に大きく寄与している。   In contrast, in the oxyfuel coal-fired power generation system of the present embodiment, the waste heat can be significantly reduced to 1.2%, so that 2.9% of the difference between the two can be effectively recovered. The oxy-combustion coal-fired power generation system of this embodiment greatly contributes to the improvement of thermal efficiency.

また、本実施例の酸素燃焼型石炭火力発電システムでは、石炭ボイラ１で燃料の石炭を燃焼させる支燃ガスを形成するために分岐した燃焼排ガスの一部と混合させる酸素を、酸素昇温用熱交換器４によって流下する燃焼排ガスとの熱交換によって昇温させ、分岐した燃焼排ガスの温度と同等の温度にして両者を混合させることが可能となるので、この混合させる燃焼排ガス中の水の凝縮と、この凝縮水への硫黄酸化物の溶解による酸性水の発生をそれぞれ回避できることによって、酸素燃焼型石炭火力発電システムを構成する配管系統の腐食を防止することができる。   In addition, in the oxygen combustion type coal-fired power generation system of the present embodiment, oxygen mixed with a part of the flue gas branched to form combustion supporting gas for burning coal of fuel in the coal boiler 1 is used for raising the temperature of oxygen. Since the temperature can be raised by heat exchange with the flue gas flowing down by the heat exchanger 4 and mixed at a temperature equivalent to that of the branched flue gas, the water in the flue gas to be mixed is mixed. By avoiding the condensation and the generation of acidic water due to the dissolution of sulfur oxides in the condensed water, it is possible to prevent corrosion of the piping system that constitutes the oxyfuel coal-fired power generation system.

本実施例の酸素燃焼型石炭火力発電システムにおいても、図８で示したものと同等の排ガス処理系統の温度変化状況を得ること、並びに図９に示した排ガス処理系統の熱損失の低減を図ることが可能となる。   Also in the oxygen combustion type coal-fired power generation system of the present embodiment, the temperature change state of the exhaust gas treatment system equivalent to that shown in FIG. 8 is obtained, and the heat loss of the exhaust gas treatment system shown in FIG. 9 is reduced. It becomes possible.

本実施例によれば、酸素燃焼型石炭火力発電システムの熱効率を向上させると共に、石炭ボイラから排出される燃焼排ガス中の凝縮水の発生、及び凝縮水への硫黄酸化物の溶解による酸性水の発生を抑制して火力発電システムの系統を構成する配管材料の腐食を未然に防止し得るようにした酸素燃焼型石炭火力発電システムが実現できる。   According to this embodiment, while improving the thermal efficiency of the oxyfuel-type coal-fired power generation system, the generation of condensed water in the combustion exhaust gas discharged from the coal boiler, and the acidic water due to the dissolution of the sulfur oxide in the condensed water It is possible to realize an oxyfuel type coal-fired power generation system that can prevent the corrosion of piping materials constituting the system of the thermal power generation system by suppressing generation.

次に本発明の第２実施例である酸素燃焼型石炭火力発電システムについて図２を用いて説明する。   Next, an oxygen combustion type coal-fired power generation system according to a second embodiment of the present invention will be described with reference to FIG.

図２に示した本発明の第２実施例である酸素燃焼型石炭火力発電システムは、図１に示した第１実施例の酸素燃焼型石炭火力発電システムと基本的な構成及び作用は同じであるので、両者に共通した構成の説明は省略し、相違する部分のみ以下に説明する。   The oxyfuel combustion type coal-fired power generation system according to the second embodiment of the present invention shown in FIG. 2 has the same basic configuration and operation as the oxyfuel combustion type coal-fired power generation system according to the first embodiment shown in FIG. Therefore, the description of the configuration common to both is omitted, and only the differences are described below.

本実施例の酸素燃焼型石炭火力発電システムでは、Ａ／Ｈ３の下流側の燃焼排ガス系統２１に、前記酸素昇温用熱交換器４が設置され、この酸素昇温用熱交換器４の下流側の燃焼排ガス系統２１に給水加熱器５及び乾式電気集塵機６が順次設置されている。   In the oxygen combustion type coal-fired power generation system of the present embodiment, the oxygen heating heat exchanger 4 is installed in the combustion exhaust gas system 21 on the downstream side of the A / H 3, and downstream of the oxygen heating heat exchanger 4. A feed water heater 5 and a dry electrostatic precipitator 6 are sequentially installed in the combustion exhaust gas system 21 on the side.

そして前記Ａ／Ｈ３、酸素昇温用熱交換器４、給水加熱器５、乾式電気集塵機６を順次通過した燃焼排ガスは、その温度を５０℃まで降下させている。   The combustion exhaust gas that has passed through the A / H 3, the heat exchanger 4 for raising the oxygen temperature, the feed water heater 5, and the dry electrostatic precipitator 6 is lowered to 50 ° C.

本実施例の酸素燃焼型石炭火力発電システムにおいては、酸素昇温用熱交換器４と給水加熱器５とを両者に共通した同一の容器内に設ける構成を採用しても良い。   In the oxygen combustion type coal-fired power generation system of the present embodiment, a configuration in which the oxygen temperature raising heat exchanger 4 and the feed water heater 5 are provided in the same container common to both may be adopted.

本実施例における酸素昇温用熱交換器４の設置位置は、ボイラ給水および酸素の昇温目標温度、すなわち必要とする吸熱量により、また、機器および配管の配置の最適化により、決定される。   The installation position of the oxygen temperature raising heat exchanger 4 in this embodiment is determined by the boiler feed water and the temperature raising target temperature of oxygen, that is, the required heat absorption amount, and by optimizing the arrangement of equipment and piping. .

上記した本実施例の酸素燃焼型石炭火力発電システムにおいても図１に示した第１実施例の酸素燃焼型石炭火力発電システムと同じ効果を達成することが可能となる。   Also in the above-described oxygen combustion type coal thermal power generation system of the present embodiment, it is possible to achieve the same effect as the oxyfuel combustion type coal thermal power generation system of the first embodiment shown in FIG.

本実施例の酸素燃焼型石炭火力発電システムにおいても、図８で示したものと同等の排ガス処理系統の温度変化状況を得ること、並びに図９に示した排ガス処理系統の熱損失の低減を図ることが可能となる。   Also in the oxygen combustion type coal-fired power generation system of the present embodiment, the temperature change state of the exhaust gas treatment system equivalent to that shown in FIG. 8 is obtained, and the heat loss of the exhaust gas treatment system shown in FIG. 9 is reduced. It becomes possible.

よって本実施例によれば、酸素燃焼型石炭火力発電システムの熱効率を向上させると共に、石炭ボイラから排出される燃焼排ガス中の凝縮水の発生、及び凝縮水への硫黄酸化物の溶解による酸性水の発生を抑制して火力発電システムの系統を構成する配管材料の腐食を未然に防止し得るようにした酸素燃焼型石炭火力発電システムが実現できる。   Therefore, according to this embodiment, the thermal efficiency of the oxyfuel-type coal-fired power generation system is improved, and the generation of condensed water in the combustion exhaust gas discharged from the coal boiler and the acidic water due to the dissolution of sulfur oxides in the condensed water Therefore, it is possible to realize an oxyfuel type coal-fired power generation system that can prevent the corrosion of piping materials constituting the system of the thermal power generation system by suppressing the occurrence of the above.

次に本発明の第３実施例である酸素燃焼型石炭火力発電システムについて図３を用いて説明する。   Next, an oxyfuel combustion type coal-fired power generation system according to a third embodiment of the present invention will be described with reference to FIG.

図３に示した本発明の第３実施例である酸素燃焼型石炭火力発電システムは、図１に示した第１実施例の酸素燃焼型石炭火力発電システムと基本的な構成及び作用は同じであるので、これらの実施例に共通した構成の説明は省略し、相違する部分のみ以下に説明する。   The basic configuration and operation of the oxygen combustion type coal thermal power generation system according to the third embodiment of the present invention shown in FIG. 3 are the same as those of the oxygen combustion type coal thermal power generation system according to the first embodiment shown in FIG. Therefore, the description of the configuration common to these embodiments is omitted, and only different portions will be described below.

本実施例の酸素燃焼型石炭火力発電システムでは、Ａ／Ｈ３の下流側の燃焼排ガス系統２１に給水加熱器５が設置され、この給水加熱器５の下流側の燃焼排ガス系統２１に前記酸素昇温用熱交換器４が設置され、この酸素昇温用熱交換器４の下流側の燃焼排ガス系統２１に乾式電気集塵機６が設置されている。   In the oxygen combustion type coal-fired power generation system of this embodiment, the feed water heater 5 is installed in the combustion exhaust gas system 21 downstream of the A / H 3, and the oxygen rise is added to the combustion exhaust gas system 21 downstream of the feed water heater 5. A warm heat exchanger 4 is installed, and a dry electrostatic precipitator 6 is installed in the combustion exhaust gas system 21 on the downstream side of the oxygen warming heat exchanger 4.

そして前記Ａ／Ｈ３、給水加熱器５、酸素昇温用熱交換器４、乾式電気集塵機６を順次通過した燃焼排ガスは、その温度を５０℃まで降下させている。   The combustion exhaust gas that has passed through the A / H 3, the feed water heater 5, the oxygen heating heat exchanger 4, and the dry electrostatic precipitator 6 in that order is lowered to 50 ° C.

よって、本実施例の酸素燃焼型石炭火力発電システムにおける酸素昇温用熱交換器４の上流側に設置された給水加熱器５では、該給水加熱器５を通過する燃焼排ガスの温度が高くなるので、前記給水加熱器５によって燃焼排ガスから回収する熱回収量を多くでき、その分だけ前記給水加熱器５を小型化することが可能となる。   Therefore, in the feed water heater 5 installed on the upstream side of the oxygen temperature raising heat exchanger 4 in the oxygen combustion type coal thermal power generation system of the present embodiment, the temperature of the combustion exhaust gas passing through the feed water heater 5 becomes high. Therefore, the heat recovery amount recovered from the combustion exhaust gas by the feed water heater 5 can be increased, and the feed water heater 5 can be downsized accordingly.

本実施例の酸素燃焼型石炭火力発電システムにおいては、酸素昇温用熱交換器４と乾式電気集塵機６とを両者に共通した同一の容器内に設ける構成を採用しても良い。   In the oxygen combustion type coal-fired power generation system of the present embodiment, a configuration in which the oxygen temperature raising heat exchanger 4 and the dry electrostatic precipitator 6 are provided in the same container common to both may be adopted.

本実施例における酸素昇温用熱交換器４の設置位置は、ボイラ給水および酸素の昇温目標温度、すなわち必要とする吸熱量により、また、機器および配管の配置の最適化により、決定される。   The installation position of the oxygen temperature raising heat exchanger 4 in this embodiment is determined by the boiler feed water and the temperature raising target temperature of oxygen, that is, the required heat absorption amount, and by optimizing the arrangement of equipment and piping. .

上記した本実施例の酸素燃焼型石炭火力発電システムにおいても図１に示した第１実施例の酸素燃焼型石炭火力発電システムと同じ効果を達成することが可能となる。   Also in the above-described oxygen combustion type coal thermal power generation system of the present embodiment, it is possible to achieve the same effect as the oxyfuel combustion type coal thermal power generation system of the first embodiment shown in FIG.

本実施例の酸素燃焼型石炭火力発電システムにおいても、図８で示したものと同等の排ガス処理系統の温度変化状況を得ること、並びに図９に示した排ガス処理系統の熱損失の低減を図ることが可能となる。   Also in the oxygen combustion type coal-fired power generation system of the present embodiment, the temperature change state of the exhaust gas treatment system equivalent to that shown in FIG. 8 is obtained, and the heat loss of the exhaust gas treatment system shown in FIG. 9 is reduced. It becomes possible.

よって本実施例によれば、酸素燃焼型石炭火力発電システムの熱効率を向上させると共に、石炭ボイラから排出される燃焼排ガス中の凝縮水の発生、及び凝縮水への硫黄酸化物の溶解による酸性水の発生を抑制して火力発電システムの系統を構成する配管材料の腐食を未然に防止し得るようにした酸素燃焼型石炭火力発電システムが実現できる。   Therefore, according to this embodiment, the thermal efficiency of the oxyfuel-type coal-fired power generation system is improved, and the generation of condensed water in the combustion exhaust gas discharged from the coal boiler and the acidic water due to the dissolution of sulfur oxides in the condensed water Therefore, it is possible to realize an oxyfuel type coal-fired power generation system that can prevent the corrosion of piping materials constituting the system of the thermal power generation system by suppressing the occurrence of the above.

次に本発明の第４実施例である酸素燃焼型石炭火力発電システムについて図４を用いて説明する。   Next, an oxygen combustion type coal-fired power generation system according to a fourth embodiment of the present invention will be described with reference to FIG.

図４に示した本発明の第４実施例である酸素燃焼型石炭火力発電システムは、図１の第１実施例に示した各実施例の酸素燃焼型石炭火力発電システムと基本的な構成及び作用は同じであるので、これらの実施例に共通した構成の説明は省略し、相違する部分のみ以下に説明する。   The oxygen combustion type coal thermal power generation system according to the fourth embodiment of the present invention shown in FIG. 4 is basically the same as the oxygen combustion type coal thermal power generation system of each embodiment shown in the first embodiment of FIG. Since the operation is the same, the description of the configuration common to these embodiments is omitted, and only different parts will be described below.

本実施例の酸素燃焼型石炭火力発電システムでは、Ａ／Ｈ３の下流側の燃焼排ガス系統２１に給水加熱器５が設置され、この給水加熱器５の下流側に乾式電気集塵機６が設置され、この乾式電気集塵機６の下流側に酸素昇温用熱交換器４が順次設置されている。   In the oxyfuel coal-fired power generation system of the present embodiment, the feed water heater 5 is installed in the combustion exhaust gas system 21 downstream of the A / H 3, and the dry electric dust collector 6 is installed downstream of the feed water heater 5, On the downstream side of the dry electrostatic precipitator 6, an oxygen temperature raising heat exchanger 4 is sequentially installed.

更に本実施例の酸素燃焼型石炭火力発電システムでは、燃焼排ガス系統２１から分岐して燃焼排ガスの一部を石炭ボイラ１に供給する混合用排ガス系統１５の分岐位置が、酸素昇温用熱交換器４の下流側で、該酸素昇温用熱交換器４と脱硫装置７との間の燃焼排ガス系統２１の位置に設置されている。   Further, in the oxygen combustion type coal-fired power generation system of the present embodiment, the branch position of the mixing exhaust gas system 15 that branches from the combustion exhaust gas system 21 and supplies a part of the combustion exhaust gas to the coal boiler 1 is the heat exchange for raising the oxygen temperature. On the downstream side of the vessel 4, it is installed at the position of the combustion exhaust gas system 21 between the oxygen temperature raising heat exchanger 4 and the desulfurization device 7.

本実施例の酸素燃焼型石炭火力発電システムにおいては、配設された混合用排ガス系統１５を通じて燃焼排ガス系統２１から燃焼排ガスの一部を分岐する前記燃焼排ガス系統２１の分岐点が、酸素昇温用熱交換器４の下流側で該酸素昇温用熱交換器４と脱硫装置７との間となる位置の燃焼排ガス系統２１に設置されており、前記給水加熱器５がＡ／Ｈ３の直下の下流側に設置されていることから、前記給水加熱器５を流下する燃焼排ガスの温度が高く、該給水加熱器５によって燃焼排ガスから回収する熱回収量が多くなるので、その分だけ前記給水加熱器５を小型化することが可能となる。   In the oxyfuel-type coal-fired power generation system of this embodiment, the branch point of the combustion exhaust gas system 21 that branches a part of the combustion exhaust gas from the combustion exhaust gas system 21 through the mixed exhaust gas system 15 is an oxygen temperature rise. It is installed in the flue gas system 21 at a position downstream of the heat exchanger 4 for oxygen and between the heat exchanger 4 for raising the oxygen temperature and the desulfurization device 7, and the feed water heater 5 is directly under A / H3. Since the temperature of the combustion exhaust gas flowing down the feed water heater 5 is high and the amount of heat recovered from the combustion exhaust gas by the feed water heater 5 increases, the amount of heat The heater 5 can be reduced in size.

本実施例の酸素燃焼型石炭火力発電システムにおいては、酸素昇温用熱交換器４と乾式電気集塵機６とを両者に共通した同一の容器内に設ける構成を採用しても良い。   In the oxygen combustion type coal-fired power generation system of the present embodiment, a configuration in which the oxygen temperature raising heat exchanger 4 and the dry electrostatic precipitator 6 are provided in the same container common to both may be adopted.

本実施例の酸素燃焼型石炭火力発電システムにおいても、図８で示したものと同等の排ガス処理系統の温度変化状況を得ること、並びに図９に示した排ガス処理系統の熱損失の低減を図ることが可能となる。   Also in the oxygen combustion type coal-fired power generation system of the present embodiment, the temperature change state of the exhaust gas treatment system equivalent to that shown in FIG. 8 is obtained, and the heat loss of the exhaust gas treatment system shown in FIG. 9 is reduced. It becomes possible.

本実施例によっても、酸素燃焼型石炭火力発電システムの熱効率を向上させると共に、石炭ボイラから排出される燃焼排ガス中の凝縮水の発生、及び凝縮水への硫黄酸化物の溶解による酸性水の発生を抑制して火力発電システムの系統を構成する配管材料の腐食を未然に防止し得るようにした酸素燃焼型石炭火力発電システムが実現できる。   This embodiment also improves the thermal efficiency of the oxyfuel-type coal-fired power generation system, generates condensed water in the combustion exhaust gas discharged from the coal boiler, and generates acidic water by dissolving sulfur oxide in the condensed water. It is possible to realize an oxyfuel-type coal-fired power generation system that can prevent corrosion of piping materials constituting the system of the thermal power generation system by suppressing the above.

次に本発明の第５実施例である酸素燃焼型石炭火力発電システムについて図５を用いて説明する。   Next, an oxyfuel combustion type coal-fired power generation system according to a fifth embodiment of the present invention will be described with reference to FIG.

図５に示した本発明の第５実施例である酸素燃焼型石炭火力発電システムは、この酸素燃焼型石炭火力発電システムを構成する部分的な構成が、図４の第４実施例に示した各実施例の酸素燃焼型石炭火力発電システムとその基本的な構成及び作用は同じであるので、これらの実施例に共通した構成の説明は省略し、相違する部分のみ以下に説明する。   The oxyfuel combustion type coal-fired power generation system according to the fifth embodiment of the present invention shown in FIG. 5 has a partial configuration constituting the oxyfuel combustion type coal-fired power generation system shown in the fourth embodiment of FIG. Since the basic configuration and operation of the oxyfuel-type coal-fired power generation system of each embodiment are the same, description of the configuration common to these embodiments is omitted, and only different portions will be described below.

本実施例の酸素燃焼型石炭火力発電システムでは、Ａ／Ｈ３の下流側の燃焼排ガス系統２１に酸素昇温用熱交換器４が設置され、この酸素昇温用熱交換器４の下流側に給水加熱器５が設置され、この給水加熱器５の下流側に乾式電気集塵機６が順次設置されている。   In the oxygen combustion type coal thermal power generation system of the present embodiment, the oxygen temperature raising heat exchanger 4 is installed in the combustion exhaust gas system 21 downstream of the A / H 3, and the oxygen temperature raising heat exchanger 4 is located downstream of the oxygen temperature raising heat exchanger 4. A feed water heater 5 is installed, and a dry electrostatic precipitator 6 is sequentially installed on the downstream side of the feed water heater 5.

更に本実施例の酸素燃焼型石炭火力発電システムでは、燃焼排ガス系統２１から分岐して燃焼排ガスの一部を石炭ボイラ１に供給する混合用排ガス系統１５の分岐位置が、乾式電気集塵機６の下流側で、該乾式電気集塵機６と脱硫装置７との間の燃焼排ガス系統２１の位置に設置されている。   Furthermore, in the oxyfuel coal-fired power generation system of the present embodiment, the branch position of the mixing exhaust gas system 15 that branches from the combustion exhaust gas system 21 and supplies a part of the combustion exhaust gas to the coal boiler 1 is downstream of the dry electric dust collector 6. On the side, it is installed at the position of the flue gas system 21 between the dry electrostatic precipitator 6 and the desulfurizer 7.

本実施例の酸素燃焼型石炭火力発電システムにおいては、配設された混合用排ガス系統１５を通じて燃焼排ガス系統２１から燃焼排ガスの一部を分岐する前記燃焼排ガス系統２１の分岐点が、乾式電気集塵機６の下流側で該乾式電気集塵機６と脱硫装置７との間となる位置の燃焼排ガス系統２１に設置されており、前記酸素昇温用熱交換器４がＡ／Ｈ３の直下の下流側に設置されていることから、前記酸素昇温用熱交換器４を流下する燃焼排ガスの温度が高く、該酸素昇温用熱交換器４によって燃焼排ガスから回収する熱回収量が多くなるので、その分だけ前記酸素昇温用熱交換器４を小型化することが可能となる。   In the oxygen combustion type coal thermal power generation system of the present embodiment, the branch point of the combustion exhaust gas system 21 that branches a part of the combustion exhaust gas from the combustion exhaust gas system 21 through the mixed exhaust gas system 15 is a dry electric dust collector. Is installed in the combustion exhaust gas system 21 at a position downstream of the dry electrostatic precipitator 6 and the desulfurization device 7, and the oxygen temperature raising heat exchanger 4 is disposed downstream of the A / H 3. Since the temperature of the combustion exhaust gas flowing down the oxygen heating heat exchanger 4 is high and the amount of heat recovered from the combustion exhaust gas by the oxygen heating heat exchanger 4 is increased. The oxygen heat-up heat exchanger 4 can be reduced in size by the amount.

本実施例の酸素燃焼型石炭火力発電システムにおいては、酸素昇温用熱交換器４と給水加熱器５とを両者に共通した同一の容器内に設ける構成を採用しても良い。   In the oxygen combustion type coal-fired power generation system of the present embodiment, a configuration in which the oxygen temperature raising heat exchanger 4 and the feed water heater 5 are provided in the same container common to both may be adopted.

本実施例における酸素昇温用熱交換器４の設置位置は、ボイラ給水および酸素の昇温目標温度、すなわち必要とする吸熱量により、また、機器および配管の配置の最適化により、決定される。   The installation position of the oxygen temperature raising heat exchanger 4 in this embodiment is determined by the boiler feed water and the temperature raising target temperature of oxygen, that is, the required heat absorption amount, and by optimizing the arrangement of equipment and piping. .

本実施例の酸素燃焼型石炭火力発電システムにおいても、図８で示したものと同等の排ガス処理系統の温度変化状況を得ること、並びに図９に示した排ガス処理系統の熱損失の低減を図ることが可能となる。   Also in the oxygen combustion type coal-fired power generation system of the present embodiment, the temperature change state of the exhaust gas treatment system equivalent to that shown in FIG. 8 is obtained, and the heat loss of the exhaust gas treatment system shown in FIG. 9 is reduced. It becomes possible.

本実施例によっても、酸素燃焼型石炭火力発電システムの熱効率を向上させると共に、石炭ボイラから排出される燃焼排ガス中の凝縮水の発生、及び凝縮水への硫黄酸化物の溶解による酸性水の発生を抑制して火力発電システムの系統を構成する配管材料の腐食を未然に防止し得るようにした酸素燃焼型石炭火力発電システムが実現できる。   This embodiment also improves the thermal efficiency of the oxyfuel-type coal-fired power generation system, generates condensed water in the combustion exhaust gas discharged from the coal boiler, and generates acidic water by dissolving sulfur oxide in the condensed water. It is possible to realize an oxyfuel-type coal-fired power generation system that can prevent corrosion of piping materials constituting the system of the thermal power generation system by suppressing the above.

次に本発明の第６実施例である酸素燃焼型石炭火力発電システムについて図６を用いて説明する。   Next, an oxygen combustion type coal-fired power generation system according to a sixth embodiment of the present invention will be described with reference to FIG.

図６に示した本発明の第５実施例である酸素燃焼型石炭火力発電システムは、この酸素燃焼型石炭火力発電システムを構成する部分的な構成が、図４の第４実施例に示した酸素燃焼型石炭火力発電システムとその基本的な構成及び作用は同じであるので、これらの実施例に共通した構成の説明は省略し、相違する部分のみ以下に説明する。   The oxygen combustion type coal-fired power generation system according to the fifth embodiment of the present invention shown in FIG. 6 has a partial configuration constituting the oxygen combustion type coal-fired power generation system shown in the fourth embodiment of FIG. Since the basic configuration and operation of the oxyfuel-type coal-fired power generation system are the same, description of the configuration common to these embodiments is omitted, and only different portions will be described below.

本実施例の酸素燃焼型石炭火力発電システムでは、Ａ／Ｈ３の下流側の燃焼排ガス系統２１に給水加熱器５が設置され、この給水加熱器５の下流側に酸素昇温用熱交換器４が設置され、この酸素昇温用熱交換器４の下流側に乾式電気集塵機６が順次設置されている。   In the oxygen combustion type coal-fired power generation system of the present embodiment, the feed water heater 5 is installed in the combustion exhaust gas system 21 downstream of the A / H 3, and the oxygen temperature raising heat exchanger 4 is disposed downstream of the feed water heater 5. And a dry electrostatic precipitator 6 is sequentially installed on the downstream side of the heat exchanger 4 for raising the oxygen temperature.

更に本実施例の酸素燃焼型石炭火力発電システムでは、燃焼排ガス系統２１から分岐して燃焼排ガスの一部を石炭ボイラ１に供給する混合用排ガス系統１５の分岐位置が、乾式電気集塵機６の下流側で、該乾式電気集塵機６と脱硫装置７との間の燃焼排ガス系統２１の位置に設置されている。   Furthermore, in the oxyfuel coal-fired power generation system of the present embodiment, the branch position of the mixing exhaust gas system 15 that branches from the combustion exhaust gas system 21 and supplies a part of the combustion exhaust gas to the coal boiler 1 is downstream of the dry electric dust collector 6. On the side, it is installed at the position of the flue gas system 21 between the dry electrostatic precipitator 6 and the desulfurizer 7.

本実施例の酸素燃焼型石炭火力発電システムにおいては、配設された混合用排ガス系統１５を通じて燃焼排ガス系統２１から燃焼排ガスの一部を分岐する前記燃焼排ガス系統２１の分岐点が、乾式電気集塵機６の下流側で該乾式電気集塵機６と脱硫装置７との間となる位置の燃焼排ガス系統２１に設置されており、前記給水加熱器５がＡ／Ｈ３の直下の下流側に設置されていることから、前記給水加熱器５を流下する燃焼排ガスの温度が高く、該給水加熱器５によって燃焼排ガスから回収する熱回収量が多くなるので、その分だけ前記給水加熱器５を小型化することが可能となる。   In the oxygen combustion type coal thermal power generation system of the present embodiment, the branch point of the combustion exhaust gas system 21 that branches a part of the combustion exhaust gas from the combustion exhaust gas system 21 through the mixed exhaust gas system 15 is a dry electric dust collector. Is installed in the combustion exhaust gas system 21 at a position downstream of the dry electrostatic precipitator 6 and the desulfurization device 7, and the feed water heater 5 is installed immediately downstream of the A / H3. Therefore, the temperature of the combustion exhaust gas flowing down the feed water heater 5 is high, and the amount of heat recovered from the combustion exhaust gas by the feed water heater 5 increases, so that the feed water heater 5 is reduced in size accordingly. Is possible.

本実施例の酸素燃焼型石炭火力発電システムにおいては、酸素昇温用熱交換器４と乾式電気集塵機６とを両者に共通した同一の容器内に設ける構成を採用しても良い。   In the oxygen combustion type coal-fired power generation system of the present embodiment, a configuration in which the oxygen temperature raising heat exchanger 4 and the dry electrostatic precipitator 6 are provided in the same container common to both may be adopted.

本実施例における酸素昇温用熱交換器４の設置位置は、ボイラ給水および酸素の昇温目標温度、すなわち必要とする吸熱量により、また、機器および配管の配置の最適化により、決定される。   The installation position of the oxygen temperature raising heat exchanger 4 in this embodiment is determined by the boiler feed water and the temperature raising target temperature of oxygen, that is, the required heat absorption amount, and by optimizing the arrangement of equipment and piping. .

本実施例の酸素燃焼型石炭火力発電システムにおいても、図８で示したものと同等の排ガス処理系統の温度変化状況を得ること、並びに図９に示した排ガス処理系統の熱損失の低減を図ることが可能となる。   Also in the oxygen combustion type coal-fired power generation system of the present embodiment, the temperature change state of the exhaust gas treatment system equivalent to that shown in FIG. 8 is obtained, and the heat loss of the exhaust gas treatment system shown in FIG. 9 is reduced. It becomes possible.

本実施例によっても、酸素燃焼型石炭火力発電システムの熱効率を向上させると共に、石炭ボイラから排出される燃焼排ガス中の凝縮水の発生、及び凝縮水への硫黄酸化物の溶解による酸性水の発生を抑制して火力発電システムの系統を構成する配管材料の腐食を未然に防止し得るようにした酸素燃焼型石炭火力発電システムが実現できる。   This embodiment also improves the thermal efficiency of the oxyfuel-type coal-fired power generation system, generates condensed water in the combustion exhaust gas discharged from the coal boiler, and generates acidic water by dissolving sulfur oxide in the condensed water. It is possible to realize an oxyfuel-type coal-fired power generation system that can prevent corrosion of piping materials constituting the system of the thermal power generation system by suppressing the above.

本発明は石炭を燃料とする酸素燃焼方式の石炭ボイラを備えた酸素燃焼型石炭火力発電システムに適用可能である。   The present invention can be applied to an oxyfuel-type coal-fired power generation system including an oxyfuel-type coal boiler using coal as fuel.

１：ボイラ、２：脱硝装置、３：エアヒータ（Ａ／Ｈ）、４：酸素昇温用熱交換器、５：給水加熱器、６：乾式電気集塵機、７：脱硫装置、８：湿式電気集塵機、９：脱水装置、１０：ＣＯ２吸脱着装置、１１：煙突、１２：酸素製造装置、１３：空気、２１：酸素供給系統、２２：混合用排ガス系統。 1: Boiler, 2: Denitration device, 3: Air heater (A / H), 4: Heat exchanger for oxygen heating, 5: Feed water heater, 6: Dry electrostatic precipitator, 7: Desulfurization device, 8: Wet electrostatic precipitator , 9: dehydration device, 10: CO 2 adsorption / desorption device, 11: chimney, 12: oxygen production device, 13: air, 21: oxygen supply system, 22: exhaust gas system for mixing.

Claims (6)

石炭を燃焼する石炭ボイラと、空気から酸素を分離させて酸素を発生する酸素製造装置とを備え、前記石炭ボイラから排出された燃焼排ガスを流下させる燃焼排ガス系統と、この燃焼排ガス系統から分岐して前記燃焼排ガスの一部を前記石炭ボイラに供給する混合用排ガス系統と、前記酸素製造装置で発生した酸素を流下させる酸素供給系統を前記混合用排ガス系統と接続して前記酸素供給系統を流れる酸素を前記混合用排ガス系統を流れる燃焼排ガスと混合させて石炭燃焼用の支燃ガスを形成し、前記混合用排ガス系統を通じてこの支焼ガスを前記石炭ボイラに供給するように構成した酸素燃焼型石炭火力発電システムにおいて、
酸素製造装置で発生した酸素を燃焼排ガスによって昇温する酸素昇温用熱交換器を前記燃焼排ガス系統に設置し、
酸素を流下させる前記酸素供給系統を前記酸素製造装置からこの酸素昇温用熱交換器を経由して前記混合用排ガス系統に接続するように配設し、
前記酸素昇温用熱交換器によって昇温させた酸素を前記混合用排ガス系統を流下する燃焼排ガスと混合させて所望の温度の支焼ガスを形成し、前記混合用排ガス系統を通じてこの支焼ガスを石炭ボイラに供給し、
前記石炭ボイラの下流側に配設した前記燃焼排ガス系統に、燃焼排ガス中の窒素酸化物を除去する脱硝装置と、この脱硝装置の下流側に設置されて該燃焼排ガスと支燃ガスとの熱交換を行うエアヒータと、このエアヒータの下流側に設置されて該燃焼排ガスによりボイラ給水を加熱する給水加熱器と、この給水加熱器の下流側に設置されて燃焼排ガス中の灰を除去する電気集塵機と、この電気集塵機の下流側に設置されて燃焼排ガス中の硫黄酸化物を除去する脱硫装置と、この脱硫装置の下流側に設置されて燃焼排ガス中の水分を除去する脱水装置と、この脱水装置の下流側に設置されて燃焼排ガス中のＣＯ ２ を回収するＣＯ ２ 吸脱着装置を備えており、
前記脱水装置とＣＯ ２ 吸脱着装置との間に位置する燃焼排ガス系統から前記混合用排ガス系統を分岐させ、分岐した燃焼排ガスの一部を前記石炭ボイラに供給するように構成し、
前記酸素昇温用熱交換器を前記電気集塵機と脱硫装置との間に位置する燃焼排ガス系統に配設し、
前記酸素昇温用熱交換器での燃焼排ガスとの熱交換によって昇温した酸素を流下する前記酸素供給系統をエアヒータより上流側に位置する前記混合用排ガス系統に接続させて酸素と燃焼排ガスとのガス混合部を設け、
前記ガス混合部によって酸素と燃焼排ガスとを混合させた支燃ガスを所望の温度に昇温させることを特徴とする、酸素燃焼型石炭火力発電システム。 A combustion exhaust gas system that includes a coal boiler that burns coal and an oxygen production device that generates oxygen by separating oxygen from the air; and a combustion exhaust gas system that causes the combustion exhaust gas discharged from the coal boiler to flow down; A mixing exhaust gas system for supplying a part of the combustion exhaust gas to the coal boiler, and an oxygen supply system for flowing down oxygen generated in the oxygen production apparatus connected to the mixing exhaust gas system to flow through the oxygen supply system An oxygen combustion type configured to mix oxygen with combustion exhaust gas flowing through the exhaust gas system for mixing to form a combustion support gas for coal combustion, and supply the combustion gas to the coal boiler through the exhaust gas system for mixing In coal-fired power generation systems,
An oxygen heating heat exchanger for raising the temperature of oxygen generated in the oxygen production apparatus by the combustion exhaust gas is installed in the combustion exhaust gas system;
The oxygen supply system for causing oxygen to flow down is disposed so as to be connected to the mixing exhaust gas system from the oxygen production apparatus via the oxygen temperature raising heat exchanger,
The oxygen raised in temperature by the heat exchanger for raising oxygen is mixed with the combustion exhaust gas flowing down the exhaust gas system for mixing to form a support gas at a desired temperature, and this support gas through the exhaust gas system for mixing. To the coal boiler,
A denitration device that removes nitrogen oxides in the combustion exhaust gas and a heat of the combustion exhaust gas and the combustion support gas that are installed downstream of the denitration device in the combustion exhaust gas system disposed on the downstream side of the coal boiler. An air heater that performs replacement, a feed water heater that is installed on the downstream side of the air heater and heats boiler feed water with the combustion exhaust gas, and an electric dust collector that is installed on the downstream side of the feed water heater and removes ash in the combustion exhaust gas A desulfurization device installed downstream of the electric dust collector to remove sulfur oxides in the combustion exhaust gas, a dehydration device installed downstream of the desulfurization device to remove moisture in the combustion exhaust gas, and the dehydration device It is equipped with a CO 2 adsorption / desorption device that is installed on the downstream side of the device and collects CO 2 in the combustion exhaust gas ,
Branching the mixing exhaust gas system from a combustion exhaust gas system located between the dehydrator and the CO 2 adsorption / desorption device, and supplying a part of the branched combustion exhaust gas to the coal boiler,
The oxygen temperature raising heat exchanger is disposed in a combustion exhaust gas system located between the electric dust collector and the desulfurization device,
Oxygen and combustion exhaust gas are connected by connecting the oxygen supply system that flows down oxygen heated by heat exchange with the combustion exhaust gas in the oxygen temperature raising heat exchanger to the mixing exhaust gas system located upstream of the air heater. A gas mixing section
An oxygen combustion type coal-fired power generation system , characterized in that the combustion support gas obtained by mixing oxygen and combustion exhaust gas is heated to a desired temperature by the gas mixing unit . 石炭を燃焼する石炭ボイラと、空気から酸素を分離させて酸素を発生する酸素製造装置とを備え、前記石炭ボイラから排出された燃焼排ガスを流下させる燃焼排ガス系統と、この燃焼排ガス系統から分岐して前記燃焼排ガスの一部を前記石炭ボイラに供給する混合用排ガス系統と、前記酸素製造装置で発生した酸素を流下させる酸素供給系統を前記混合用排ガス系統と接続して前記酸素供給系統を流れる酸素を前記混合用排ガス系統を流れる燃焼排ガスと混合させて石炭燃焼用の支燃ガスを形成し、前記混合用排ガス系統を通じてこの支焼ガスを前記石炭ボイラに供給するように構成した酸素燃焼型石炭火力発電システムであって、
酸素製造装置で発生した酸素を燃焼排ガスによって昇温する酸素昇温用熱交換器を前記燃焼排ガス系統に設置し、
酸素を流下させる前記酸素供給系統を前記酸素製造装置からこの酸素昇温用熱交換器を経由して前記混合用排ガス系統に接続するように配設し、
前記酸素昇温用熱交換器によって昇温させた酸素を前記混合用排ガス系統を流下する燃焼排ガスと混合させて所望の温度の支焼ガスを形成し、前記混合用排ガス系統を通じてこの支焼ガスを石炭ボイラに供給した酸素燃焼型石炭火力発電システムにおいて、
前記石炭ボイラの下流側に配設した前記燃焼排ガス系統に、燃焼排ガス中の窒素酸化物を除去する脱硝装置と、この脱硝装置の下流側に設置されて該燃焼排ガスと支燃ガスとの熱交換を行うエアヒータと、このエアヒータの下流側に設置されて該燃焼排ガスによりボイラ給水を加熱する給水加熱器と、この給水加熱器の下流側に設置されて燃焼排ガス中の灰を除去する電気集塵機と、この電気集塵機の下流側に設置されて燃焼排ガス中の硫黄酸化物を除去する脱硫装置と、この脱硫装置の下流側に設置されて燃焼排ガス中の水分を除去する脱水装置と、この脱水装置の下流側に設置されて燃焼排ガス中のＣＯ ２ を回収するＣＯ ２ 吸脱着装置を備えており、
前記脱水装置とＣＯ ２ 吸脱着装置との間に位置する燃焼排ガス系統から前記混合用排ガス系統を分岐させ、分岐した燃焼排ガスの一部を前記石炭ボイラに供給するように構成し、
前記酸素昇温用熱交換器を前記エアヒータと給水加熱器との間に位置する燃焼排ガス系統に配設し、
前記酸素昇温用熱交換器での燃焼排ガスとの熱交換によって昇温した酸素を流下する前記酸素供給系統をエアヒータより上流側に位置する前記混合用排ガス系統に接続させて酸素と燃焼排ガスとのガス混合部を設け、
前記ガス混合部によって酸素と燃焼排ガスとを混合させた支燃ガスを所望の温度に昇温させることを特徴とする、酸素燃焼型石炭火力発電システム。 A combustion exhaust gas system that includes a coal boiler that burns coal and an oxygen production device that generates oxygen by separating oxygen from the air; and a combustion exhaust gas system that causes the combustion exhaust gas discharged from the coal boiler to flow down; A mixing exhaust gas system for supplying a part of the combustion exhaust gas to the coal boiler, and an oxygen supply system for flowing down oxygen generated in the oxygen production apparatus connected to the mixing exhaust gas system to flow through the oxygen supply system An oxygen combustion type configured to mix oxygen with combustion exhaust gas flowing through the exhaust gas system for mixing to form a combustion support gas for coal combustion, and supply the combustion gas to the coal boiler through the exhaust gas system for mixing A coal-fired power generation system,
An oxygen heating heat exchanger for raising the temperature of oxygen generated in the oxygen production apparatus by the combustion exhaust gas is installed in the combustion exhaust gas system;
The oxygen supply system for causing oxygen to flow down is disposed so as to be connected to the mixing exhaust gas system from the oxygen production apparatus via the oxygen temperature raising heat exchanger,
The oxygen raised in temperature by the heat exchanger for raising oxygen is mixed with the combustion exhaust gas flowing down the exhaust gas system for mixing to form a support gas at a desired temperature, and this support gas through the exhaust gas system for mixing. In the oxyfuel coal-fired power generation system that supplies
A denitration device that removes nitrogen oxides in the combustion exhaust gas and a heat of the combustion exhaust gas and the combustion support gas that are installed downstream of the denitration device in the combustion exhaust gas system disposed on the downstream side of the coal boiler. An air heater that performs replacement, a feed water heater that is installed on the downstream side of the air heater and heats boiler feed water with the combustion exhaust gas, and an electric dust collector that is installed on the downstream side of the feed water heater and removes ash in the combustion exhaust gas A desulfurization device installed downstream of the electric dust collector to remove sulfur oxides in the combustion exhaust gas, a dehydration device installed downstream of the desulfurization device to remove moisture in the combustion exhaust gas, and the dehydration device It is equipped with a CO 2 adsorption / desorption device that is installed on the downstream side of the device and collects CO 2 in the combustion exhaust gas ,
Branching the mixing exhaust gas system from a combustion exhaust gas system located between the dehydrator and the CO 2 adsorption / desorption device, and supplying a part of the branched combustion exhaust gas to the coal boiler,
The oxygen temperature raising heat exchanger is disposed in a combustion exhaust gas system located between the air heater and the feed water heater,
Oxygen and combustion exhaust gas are connected by connecting the oxygen supply system that flows down oxygen heated by heat exchange with the combustion exhaust gas in the oxygen temperature raising heat exchanger to the mixing exhaust gas system located upstream of the air heater. A gas mixing section
An oxygen combustion type coal-fired power generation system, characterized in that the combustion support gas obtained by mixing oxygen and combustion exhaust gas is heated to a desired temperature by the gas mixing unit . 石炭を燃焼する石炭ボイラと、空気から酸素を分離させて酸素を発生する酸素製造装置とを備え、前記石炭ボイラから排出された燃焼排ガスを流下させる燃焼排ガス系統と、この燃焼排ガス系統から分岐して前記燃焼排ガスの一部を前記石炭ボイラに供給する混合用排ガス系統と、前記酸素製造装置で発生した酸素を流下させる酸素供給系統を前記混合用排ガス系統と接続して前記酸素供給系統を流れる酸素を前記混合用排ガス系統を流れる燃焼排ガスと混合させて石炭燃焼用の支燃ガスを形成し、前記混合用排ガス系統を通じてこの支焼ガスを前記石炭ボイラに供給するように構成した酸素燃焼型石炭火力発電システムであって、
酸素製造装置で発生した酸素を燃焼排ガスによって昇温する酸素昇温用熱交換器を前記燃焼排ガス系統に設置し、
酸素を流下させる前記酸素供給系統を前記酸素製造装置からこの酸素昇温用熱交換器を経由して前記混合用排ガス系統に接続するように配設し、
前記酸素昇温用熱交換器によって昇温させた酸素を前記混合用排ガス系統を流下する燃焼排ガスと混合させて所望の温度の支焼ガスを形成し、前記混合用排ガス系統を通じてこの支焼ガスを石炭ボイラに供給した酸素燃焼型石炭火力発電システムにおいて、
前記石炭ボイラの下流側に配設した前記燃焼排ガス系統に、燃焼排ガス中の窒素酸化物を除去する脱硝装置と、この脱硝装置の下流側に設置されて該燃焼排ガスと支燃ガスとの熱交換を行うエアヒータと、このエアヒータの下流側に設置されて該燃焼排ガスによりボイラ給水を加熱する給水加熱器と、この給水加熱器の下流側に設置されて燃焼排ガス中の灰を除去する電気集塵機と、この電気集塵機の下流側に設置されて燃焼排ガス中の硫黄酸化物を除去する脱硫装置と、この脱硫装置の下流側に設置されて燃焼排ガス中の水分を除去する脱水装置と、この脱水装置の下流側に設置されて燃焼排ガス中のＣＯ ２ を回収するＣＯ ２ 吸脱着装置を備えており、
前記脱水装置とＣＯ ２ 吸脱着装置との間に位置する燃焼排ガス系統から前記混合用排ガス系統を分岐させ、分岐した燃焼排ガスの一部を前記石炭ボイラに供給するように構成し、
前記酸素昇温用熱交換器を前記給水加熱器と電気集塵機との間に位置する燃焼排ガス系統に配設し、
前記酸素昇温用熱交換器での燃焼排ガスとの熱交換によって昇温した酸素を流下する前記酸素供給系統をエアヒータより上流側に位置する前記混合用排ガス系統に接続させて酸素と燃焼排ガスとのガス混合部を設け、
前記ガス混合部によって酸素と燃焼排ガスとを混合させた支燃ガスを所望の温度に昇温させることを特徴とする、酸素燃焼型石炭火力発電システム。 A combustion exhaust gas system that includes a coal boiler that burns coal and an oxygen production device that generates oxygen by separating oxygen from the air; and a combustion exhaust gas system that causes the combustion exhaust gas discharged from the coal boiler to flow down; A mixing exhaust gas system for supplying a part of the combustion exhaust gas to the coal boiler, and an oxygen supply system for flowing down oxygen generated in the oxygen production apparatus connected to the mixing exhaust gas system to flow through the oxygen supply system An oxygen combustion type configured to mix oxygen with combustion exhaust gas flowing through the exhaust gas system for mixing to form a combustion support gas for coal combustion, and supply the combustion gas to the coal boiler through the exhaust gas system for mixing A coal-fired power generation system,
An oxygen heating heat exchanger for raising the temperature of oxygen generated in the oxygen production apparatus by the combustion exhaust gas is installed in the combustion exhaust gas system;
The oxygen supply system for causing oxygen to flow down is disposed so as to be connected to the mixing exhaust gas system from the oxygen production apparatus via the oxygen temperature raising heat exchanger,
The oxygen raised in temperature by the heat exchanger for raising oxygen is mixed with the combustion exhaust gas flowing down the exhaust gas system for mixing to form a support gas at a desired temperature, and this support gas through the exhaust gas system for mixing. In the oxyfuel coal-fired power generation system that supplies
A denitration device that removes nitrogen oxides in the combustion exhaust gas and a heat of the combustion exhaust gas and the combustion support gas that are installed downstream of the denitration device in the combustion exhaust gas system disposed on the downstream side of the coal boiler. An air heater that performs replacement, a feed water heater that is installed on the downstream side of the air heater and heats boiler feed water with the combustion exhaust gas, and an electric dust collector that is installed on the downstream side of the feed water heater and removes ash in the combustion exhaust gas A desulfurization device installed downstream of the electric dust collector to remove sulfur oxides in the combustion exhaust gas, a dehydration device installed downstream of the desulfurization device to remove moisture in the combustion exhaust gas, and the dehydration device It is equipped with a CO 2 adsorption / desorption device that is installed on the downstream side of the device and collects CO 2 in the combustion exhaust gas ,
Branching the mixing exhaust gas system from a combustion exhaust gas system located between the dehydrator and the CO 2 adsorption / desorption device, and supplying a part of the branched combustion exhaust gas to the coal boiler,
The oxygen temperature raising heat exchanger is disposed in a combustion exhaust gas system located between the feed water heater and the electric dust collector,
Oxygen and combustion exhaust gas are connected by connecting the oxygen supply system that flows down oxygen heated by heat exchange with the combustion exhaust gas in the oxygen temperature raising heat exchanger to the mixing exhaust gas system located upstream of the air heater. A gas mixing section
An oxygen combustion type coal-fired power generation system, characterized in that the combustion support gas obtained by mixing oxygen and combustion exhaust gas is heated to a desired temperature by the gas mixing unit . 石炭を燃焼する石炭ボイラと、空気から酸素を分離させて酸素を発生する酸素製造装置とを備え、前記石炭ボイラから排出された燃焼排ガスを流下させる燃焼排ガス系統と、この燃焼排ガス系統から分岐して前記燃焼排ガスの一部を前記石炭ボイラに供給する混合用排ガス系統と、前記酸素製造装置で発生した酸素を流下させる酸素供給系統を前記混合用排ガス系統と接続して前記酸素供給系統を流れる酸素を前記混合用排ガス系統を流れる燃焼排ガスと混合させて石炭燃焼用の支燃ガスを形成し、前記混合用排ガス系統を通じてこの支焼ガスを前記石炭ボイラに供給するように構成した酸素燃焼型石炭火力発電システムであって、
酸素製造装置で発生した酸素を燃焼排ガスによって昇温する酸素昇温用熱交換器を前記燃焼排ガス系統に設置し、
酸素を流下させる前記酸素供給系統を前記酸素製造装置からこの酸素昇温用熱交換器を経由して前記混合用排ガス系統に接続するように配設し、
前記酸素昇温用熱交換器によって昇温させた酸素を前記混合用排ガス系統を流下する燃焼排ガスと混合させて所望の温度の支焼ガスを形成し、前記混合用排ガス系統を通じてこの支焼ガスを石炭ボイラに供給した酸素燃焼型石炭火力発電システムにおいて、
前記石炭ボイラの下流側に配設した前記燃焼排ガス系統に、燃焼排ガス中の窒素酸化物を除去する脱硝装置と、この脱硝装置の下流側に設置されて該燃焼排ガスと支燃ガスとの熱交換を行うエアヒータと、このエアヒータの下流側に設置されて該燃焼排ガスによりボイラ給水を加熱する給水加熱器と、この給水加熱器の下流側に設置されて燃焼排ガス中の灰を除去する電気集塵機と、この電気集塵機の下流側に設置されて燃焼排ガス中の硫黄酸化物を除去する脱硫装置とを備えており、
前記電気集塵機と脱硫装置との間に位置する燃焼排ガス系統から前記混合用排ガス系統を分岐させ、分岐した燃焼排ガスの一部を前記石炭ボイラに供給するように構成し、
前記酸素昇温用熱交換器を前記電気集塵機と脱硫装置との間に位置する燃焼排ガス系統に配設し、
前記酸素昇温用熱交換器での燃焼排ガスとの熱交換によって昇温した酸素を流下する前記酸素供給系統をエアヒータより上流側に位置する前記混合用排ガス系統に接続させて酸素と燃焼排ガスとのガス混合部を設け、
前記ガス混合部によって酸素と燃焼排ガスとを混合させた支燃ガスを所望の温度に昇温させることを特徴とする、酸素燃焼型石炭火力発電システム。 A combustion exhaust gas system that includes a coal boiler that burns coal and an oxygen production device that generates oxygen by separating oxygen from the air; and a combustion exhaust gas system that causes the combustion exhaust gas discharged from the coal boiler to flow down; A mixing exhaust gas system for supplying a part of the combustion exhaust gas to the coal boiler, and an oxygen supply system for flowing down oxygen generated in the oxygen production apparatus connected to the mixing exhaust gas system to flow through the oxygen supply system An oxygen combustion type configured to mix oxygen with combustion exhaust gas flowing through the exhaust gas system for mixing to form a combustion support gas for coal combustion, and supply the combustion gas to the coal boiler through the exhaust gas system for mixing A coal-fired power generation system,
An oxygen heating heat exchanger for raising the temperature of oxygen generated in the oxygen production apparatus by the combustion exhaust gas is installed in the combustion exhaust gas system;
The oxygen supply system for causing oxygen to flow down is disposed so as to be connected to the mixing exhaust gas system from the oxygen production apparatus via the oxygen temperature raising heat exchanger,
The oxygen raised in temperature by the heat exchanger for raising oxygen is mixed with the combustion exhaust gas flowing down the exhaust gas system for mixing to form a support gas at a desired temperature, and this support gas through the exhaust gas system for mixing. In the oxyfuel coal-fired power generation system that supplies
A denitration device that removes nitrogen oxides in the combustion exhaust gas and a heat of the combustion exhaust gas and the combustion support gas that are installed downstream of the denitration device in the combustion exhaust gas system disposed on the downstream side of the coal boiler. An air heater that performs replacement, a feed water heater that is installed on the downstream side of the air heater and heats boiler feed water with the combustion exhaust gas, and an electric dust collector that is installed on the downstream side of the feed water heater and removes ash in the combustion exhaust gas And a desulfurization device installed on the downstream side of the electric dust collector to remove sulfur oxides in the combustion exhaust gas,
Branching the exhaust gas system for mixing from a combustion exhaust gas system located between the electrostatic precipitator and the desulfurizer, and configured to supply a part of the branched combustion exhaust gas to the coal boiler,
The oxygen temperature raising heat exchanger is disposed in a combustion exhaust gas system located between the electric dust collector and the desulfurization device,
Oxygen and combustion exhaust gas are connected by connecting the oxygen supply system that flows down oxygen heated by heat exchange with the combustion exhaust gas in the oxygen temperature raising heat exchanger to the mixing exhaust gas system located upstream of the air heater. A gas mixing section
An oxygen combustion type coal-fired power generation system, characterized in that the combustion support gas obtained by mixing oxygen and combustion exhaust gas is heated to a desired temperature by the gas mixing unit . 石炭を燃焼する石炭ボイラと、空気から酸素を分離させて酸素を発生する酸素製造装置とを備え、前記石炭ボイラから排出された燃焼排ガスを流下させる燃焼排ガス系統と、この燃焼排ガス系統から分岐して前記燃焼排ガスの一部を前記石炭ボイラに供給する混合用排ガス系統と、前記酸素製造装置で発生した酸素を流下させる酸素供給系統を前記混合用排ガス系統と接続して前記酸素供給系統を流れる酸素を前記混合用排ガス系統を流れる燃焼排ガスと混合させて石炭燃焼用の支燃ガスを形成し、前記混合用排ガス系統を通じてこの支焼ガスを前記石炭ボイラに供給するように構成した酸素燃焼型石炭火力発電システムであって、
酸素製造装置で発生した酸素を燃焼排ガスによって昇温する酸素昇温用熱交換器を前記燃焼排ガス系統に設置し、
酸素を流下させる前記酸素供給系統を前記酸素製造装置からこの酸素昇温用熱交換器を経由して前記混合用排ガス系統に接続するように配設し、
前記酸素昇温用熱交換器によって昇温させた酸素を前記混合用排ガス系統を流下する燃焼排ガスと混合させて所望の温度の支焼ガスを形成し、前記混合用排ガス系統を通じてこの支焼ガスを石炭ボイラに供給した酸素燃焼型石炭火力発電システムにおいて、
前記石炭ボイラの下流側に配設した前記燃焼排ガス系統に、燃焼排ガス中の窒素酸化物を除去する脱硝装置と、この脱硝装置の下流側に設置されて該燃焼排ガスと支燃ガスとの熱交換を行うエアヒータと、このエアヒータの下流側に設置されて該燃焼排ガスによりボイラ給水を加熱する給水加熱器と、この給水加熱器の下流側に設置されて燃焼排ガス中の灰を除去する電気集塵機と、この電気集塵機の下流側に設置されて燃焼排ガス中の硫黄酸化物を除去する脱硫装置とを備えており、
前記電気集塵機と脱硫装置との間に位置する燃焼排ガス系統から前記混合用排ガス系統を分岐させ、分岐した燃焼排ガスの一部を前記石炭ボイラに供給するように構成し、
前記酸素昇温用熱交換器を前記エアヒータと給水加熱器との間に位置する燃焼排ガス系統に配設し、
前記酸素昇温用熱交換器での燃焼排ガスとの熱交換によって昇温した酸素を流下する前記酸素供給系統をエアヒータより上流側に位置する前記混合用排ガス系統に接続させて酸素と燃焼排ガスとのガス混合部を設け、
前記ガス混合部によって酸素と燃焼排ガスとを混合させた支燃ガスを所望の温度に昇温させることを特徴とする、酸素燃焼型石炭火力発電システム。 A combustion exhaust gas system that includes a coal boiler that burns coal and an oxygen production device that generates oxygen by separating oxygen from the air; and a combustion exhaust gas system that causes the combustion exhaust gas discharged from the coal boiler to flow down; A mixing exhaust gas system for supplying a part of the combustion exhaust gas to the coal boiler, and an oxygen supply system for flowing down oxygen generated in the oxygen production apparatus connected to the mixing exhaust gas system to flow through the oxygen supply system An oxygen combustion type configured to mix oxygen with combustion exhaust gas flowing through the exhaust gas system for mixing to form a combustion support gas for coal combustion, and supply the combustion gas to the coal boiler through the exhaust gas system for mixing A coal-fired power generation system,
An oxygen heating heat exchanger for raising the temperature of oxygen generated in the oxygen production apparatus by the combustion exhaust gas is installed in the combustion exhaust gas system;
The oxygen supply system for causing oxygen to flow down is disposed so as to be connected to the mixing exhaust gas system from the oxygen production apparatus via the oxygen temperature raising heat exchanger,
The oxygen raised in temperature by the heat exchanger for raising oxygen is mixed with the combustion exhaust gas flowing down the exhaust gas system for mixing to form a support gas at a desired temperature, and this support gas through the exhaust gas system for mixing. In the oxyfuel coal-fired power generation system that supplies
A denitration device that removes nitrogen oxides in the combustion exhaust gas and a heat of the combustion exhaust gas and the combustion support gas that are installed downstream of the denitration device in the combustion exhaust gas system disposed on the downstream side of the coal boiler. An air heater that performs replacement, a feed water heater that is installed on the downstream side of the air heater and heats boiler feed water with the combustion exhaust gas, and an electric dust collector that is installed on the downstream side of the feed water heater and removes ash in the combustion exhaust gas And a desulfurization device installed on the downstream side of the electric dust collector to remove sulfur oxides in the combustion exhaust gas,
Branching the exhaust gas system for mixing from a combustion exhaust gas system located between the electrostatic precipitator and the desulfurizer, and configured to supply a part of the branched combustion exhaust gas to the coal boiler,
The oxygen temperature raising heat exchanger is disposed in a combustion exhaust gas system located between the air heater and the feed water heater,
Oxygen and combustion exhaust gas are connected by connecting the oxygen supply system that flows down oxygen heated by heat exchange with the combustion exhaust gas in the oxygen temperature raising heat exchanger to the mixing exhaust gas system located upstream of the air heater. A gas mixing section
An oxygen combustion type coal-fired power generation system, characterized in that the combustion support gas obtained by mixing oxygen and combustion exhaust gas is heated to a desired temperature by the gas mixing unit . 石炭を燃焼する石炭ボイラと、空気から酸素を分離させて酸素を発生する酸素製造装置とを備え、前記石炭ボイラから排出された燃焼排ガスを流下させる燃焼排ガス系統と、この燃焼排ガス系統から分岐して前記燃焼排ガスの一部を前記石炭ボイラに供給する混合用排ガス系統と、前記酸素製造装置で発生した酸素を流下させる酸素供給系統を前記混合用排ガス系統と接続して前記酸素供給系統を流れる酸素を前記混合用排ガス系統を流れる燃焼排ガスと混合させて石炭燃焼用の支燃ガスを形成し、前記混合用排ガス系統を通じてこの支焼ガスを前記石炭ボイラに供給するように構成した酸素燃焼型石炭火力発電システムであって、
酸素製造装置で発生した酸素を燃焼排ガスによって昇温する酸素昇温用熱交換器を前記燃焼排ガス系統に設置し、
酸素を流下させる前記酸素供給系統を前記酸素製造装置からこの酸素昇温用熱交換器を経由して前記混合用排ガス系統に接続するように配設し、
前記酸素昇温用熱交換器によって昇温させた酸素を前記混合用排ガス系統を流下する燃焼排ガスと混合させて所望の温度の支焼ガスを形成し、前記混合用排ガス系統を通じてこの支焼ガスを石炭ボイラに供給した酸素燃焼型石炭火力発電システムにおいて、
前記石炭ボイラの下流側に配設した前記燃焼排ガス系統に、燃焼排ガス中の窒素酸化物を除去する脱硝装置と、この脱硝装置の下流側に設置されて該燃焼排ガスと支燃ガスとの熱交換を行うエアヒータと、このエアヒータの下流側に設置されて該燃焼排ガスによりボイラ給水を加熱する給水加熱器と、この給水加熱器の下流側に設置されて燃焼排ガス中の灰を除去する電気集塵機と、この電気集塵機の下流側に設置されて燃焼排ガス中の硫黄酸化物を除去する脱硫装置とを備えており、
前記電気集塵機と脱硫装置との間に位置する燃焼排ガス系統から前記混合用排ガス系統を分岐させ、分岐した燃焼排ガスの一部を前記石炭ボイラに供給するように構成し、
前記酸素昇温用熱交換器を前記給水加熱器と電気集塵機との間に位置する燃焼排ガス系統に配設し、
前記酸素昇温用熱交換器での燃焼排ガスとの熱交換によって昇温した酸素を流下する前記酸素供給系統をエアヒータより上流側に位置する前記混合用排ガス系統に接続させて酸素と燃焼排ガスとのガス混合部を設け、
前記ガス混合部によって酸素と燃焼排ガスとを混合させた支燃ガスを所望の温度に昇温させることを特徴とする、酸素燃焼型石炭火力発電システム。 A combustion exhaust gas system that includes a coal boiler that burns coal and an oxygen production device that generates oxygen by separating oxygen from the air; and a combustion exhaust gas system that causes the combustion exhaust gas discharged from the coal boiler to flow down; A mixing exhaust gas system for supplying a part of the combustion exhaust gas to the coal boiler, and an oxygen supply system for flowing down oxygen generated in the oxygen production apparatus connected to the mixing exhaust gas system to flow through the oxygen supply system An oxygen combustion type configured to mix oxygen with combustion exhaust gas flowing through the exhaust gas system for mixing to form a combustion support gas for coal combustion, and supply the combustion gas to the coal boiler through the exhaust gas system for mixing A coal-fired power generation system,
An oxygen heating heat exchanger for raising the temperature of oxygen generated in the oxygen production apparatus by the combustion exhaust gas is installed in the combustion exhaust gas system;
The oxygen supply system for causing oxygen to flow down is disposed so as to be connected to the mixing exhaust gas system from the oxygen production apparatus via the oxygen temperature raising heat exchanger,
The oxygen raised in temperature by the heat exchanger for raising oxygen is mixed with the combustion exhaust gas flowing down the exhaust gas system for mixing to form a support gas at a desired temperature, and this support gas through the exhaust gas system for mixing. In the oxyfuel coal-fired power generation system that supplies
A denitration device that removes nitrogen oxides in the combustion exhaust gas and a heat of the combustion exhaust gas and the combustion support gas that are installed downstream of the denitration device in the combustion exhaust gas system disposed on the downstream side of the coal boiler. An air heater that performs replacement, a feed water heater that is installed on the downstream side of the air heater and heats boiler feed water with the combustion exhaust gas, and an electric dust collector that is installed on the downstream side of the feed water heater and removes ash in the combustion exhaust gas And a desulfurization device installed on the downstream side of the electric dust collector to remove sulfur oxides in the combustion exhaust gas,
Branching the exhaust gas system for mixing from a combustion exhaust gas system located between the electrostatic precipitator and the desulfurizer, and configured to supply a part of the branched combustion exhaust gas to the coal boiler,
The oxygen temperature raising heat exchanger is disposed in a combustion exhaust gas system located between the feed water heater and the electric dust collector,
Oxygen and combustion exhaust gas are connected by connecting the oxygen supply system that flows down oxygen heated by heat exchange with the combustion exhaust gas in the oxygen temperature raising heat exchanger to the mixing exhaust gas system located upstream of the air heater. A gas mixing section
An oxygen combustion type coal-fired power generation system, characterized in that the combustion support gas obtained by mixing oxygen and combustion exhaust gas is heated to a desired temperature by the gas mixing unit .
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