JP2013250162A - Detection device for condensate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To estimate a state of impurities of coal gasification gas from a state of char.SOLUTION: A Cl concentration (condensation concentration) fixed from a coal gasification gas g to char is estimated by detecting the concentration of Cl supplied from coal and the concentration of Cl ions included in a condensate fixed to the char and a condensate included in slag, and the state (concentration) of impurities (HCl) remaining in a gaseous state in a coal gasification gas h is accurately calculated.

Description

  The present invention relates to states of various condensable substances (condensates) of coal gasification gas such as alkali metals, alkaline earth metals, heavy metals such as mercury, ammonium salts, halides, tars, polycyclic aromatics, etc. It is related with the condensate detection apparatus which estimates condensate (impurity) and the state (concentration) of the condensate (impurity) contained in coal gasification gas.

  Coal exists in a large area of the world, has a large recoverable reserve, and has a stable price, so it has a high supply stability and a low price per calorific value. As a thermal power generation facility using coal as fuel, an integrated coal gasfication combined cycle (IGCC) is known. In coal gasification combined cycle power generation, electric power is obtained by driving a gas turbine using coal gasification gas as fuel, exhaust gas from the gas turbine is recovered to generate steam, and the generated steam drives the steam turbine to generate electric power. (See, for example, Patent Document 1).

  The coal gasification gas generated in the coal gasification furnace contains impurities such as halides and mercury, impurities that affect the subsequent equipment, and trace components, so the gas purification equipment removes impurities from the coal gasification gas. It is used as fuel gas. As a facility for removing impurities, various dry gas refining facilities for removing impurities from high-temperature coal gasification gas have been studied. By refine | purifying coal gasification gas by dry type, since coal gasification gas can be refine | purified with high temperature, the raise and lower of temperature and pressure can be suppressed, and fuel gas can be obtained.

  In dry gas purification equipment, an absorbent is used to absorb impurities such as halides and mercury, thereby maintaining the temperature and pressure (suppressing pressure loss) to obtain fuel gas. The amount of absorbent used to absorb impurities is determined by the concentration of impurities contained in the coal gasification gas.

  Condensate (impurities) contained in coal gasification gas changes in form between gas and solid depending on temperature, so the concentration of impurities contained in coal gasification gas should be directly measured and grasped. It is difficult. For this reason, the state of impurities contained in the coal gasification gas is estimated based on the fact that the amount of impurities originally contained in the coal used in the coal gasification furnace differs depending on the type of coal. The amount of absorbent used is set according to the concentration of impurities.

  However, when impurities are condensed and solidified, the concentration of impurities contained in the gas state of coal gasification gas (impurities that are not condensed) changes, and the amount of absorbent used may not be set appropriately. Conceivable. The state of condensation of impurities is not only due to changes in the form of coal gasification gas depending on the temperature, but also by generating condensable components by chemical reaction with other components (components that produce condensable impurities) contained in coal. Change. Therefore, the condensed state cannot be uniquely determined because condensable components generated by temperature and chemical reaction influence each other. For this reason, it has been difficult to estimate the concentration of impurities (impurities that are not condensed) contained in the coal gasification gas in a gaseous state.

JP 2005-171148 A

  The present invention has been made in view of the above situation, and without directly analyzing impurities contained in the gas state of the coal gasification gas, the impurities contained in the gas state of the coal gasification gas (impurities that are not condensed). An object of the present invention is to provide a condensate detection device that can accurately derive the state (concentration).

  In order to achieve the above object, a condensate detection device according to the first aspect of the present invention comprises a separation / collection means for separating / collecting condensate present in a coal gasification furnace system, and a separation / capture unit. The analysis means for analyzing the condensate separated by the collecting means, and the gasified coal gasification gas after the condensate is separated by the separation / collection means based on the state of the condensate analyzed by the analyzing means And derivation means for deriving the status of impurities contained in (impurities that have not been condensed).

  In this invention which concerns on Claim 1, by analyzing the condensate isolate | separated and collected in the system of a coal gasification furnace, the impurity (condensate which is not condensed) contained in gaseous state in coal gasification gas is analyzed. The form or the like (compound or the like) can be derived by the deriving means, and the compound form of the impurities contained in the gaseous state in the condensate or coal gasification gas can be estimated.

  For this reason, the state (concentration) of impurities (impurities that are not condensed) contained in the gas state of the coal gasification gas is accurately derived without directly analyzing the impurities contained in the gas state of the coal gasification gas. It is possible to reflect the state of impurities contained in the gasified coal gas in the operation plan, equipment design, maintenance plan, and the like.

  And the condensate detection device of the present invention according to claim 2 is the condensate detection device according to claim 1, wherein the analysis means uses the condensate condensed by the reaction with alkali metal or alkaline earth metal. Based on the analysis means to be analyzed and the state of the condensate analyzed by the analysis means, impurities (condensed) contained in the coal gasification gas after the condensate has been separated by the separation / collection means And a deriving means for deriving the state of the impurities).

  In the present invention according to claim 2, by analyzing the condensate condensed by the reaction with alkali metal and alkaline earth metal, impurities contained in the gas state of coal gasification gas (impurities that are not condensed) It is possible to derive the situation (element form, etc.).

  According to a third aspect of the present invention, there is provided the condensate detection apparatus according to the second aspect of the present invention. In the condensate detection apparatus according to the second aspect, the analyzing means detects the alkali metal or alkaline earth metal by analyzing the condensate. In addition, condensable impurities are estimated based on the detected alkali metal and alkaline earth metal, and the derivation means is a separation / collection means based on the state of the condensable impurities estimated by the analysis means. The present invention is characterized in that the state of impurities contained in a gaseous state in the coal gasification gas after being separated is derived.

  In this invention which concerns on Claim 3, an impurity is estimated by analyzing the condensate condensed by reaction with an alkali metal and an alkaline-earth metal, and the situation of the impurity contained in gaseous form in coal gasification gas is shown. Can be derived.

  According to a fourth aspect of the present invention, there is provided the condensate detection apparatus according to the third aspect of the present invention, in the condensate detection apparatus according to the third aspect, wherein the derivation means is based on the concentration of condensable impurities estimated by the analysis means. When the concentration of impurities contained in the condensate becomes low, it is determined that the concentration of impurities contained in the gaseous state in the coal gasification gas is high, and the state of impurities is derived.

  According to a fifth aspect of the present invention, there is provided the condensate detection device according to the first aspect of the present invention, wherein the condensate detection device according to the first aspect is the coal gas after the condensate is separated by the separation / collection means in the derivation means. The present invention is characterized in that the state of impurities contained in gaseous form in the chemical gas is derived.

  In the present invention according to claim 5, by analyzing the impurities (chlorine and fluorine) in the condensate, the situation (concentration and form) of the impurities contained in the gas state in the coal gasification gas can be derived. .

  According to a sixth aspect of the present invention, there is provided the condensate detection apparatus according to the fifth aspect, wherein the analysis means estimates the concentration of condensable impurities (chlorine / fluorine) and derives it. The means is characterized in that the concentration of impurities contained in a gaseous form in the coal gasification gas is derived according to the concentration of impurities contained in the condensate.

  According to a seventh aspect of the present invention, there is provided the condensate detection apparatus according to the sixth aspect of the present invention, wherein in the condensate detection apparatus according to the sixth aspect, the derivation means is configured such that when the concentration of impurities contained in the condensate is low It is characterized in that the impurity state is derived by judging that the concentration of the impurity contained in the gaseous state in the gasification gas has increased.

  Further, the condensate detection device according to the present invention according to claim 8 is the condensate detection device according to any one of claims 1 to 7, wherein the separation / collection means is a coal gasification gas. It is a cyclone or dust filter which isolate | separates char from, The condensate is what was fixed to the char isolate | separated with the cyclone or dust filter.

  A condensate detection apparatus according to a ninth aspect of the present invention is the condensate detection apparatus according to any one of the first to seventh aspects, wherein the condensation according to the first or second aspect is performed. In the object detection apparatus, the separation / collection means is a means for recovering slag after the coal is gasified by an oxidation reaction, and the condensate is fixed to the recovered slag. And

  Further, the condensate detection device of the present invention according to claim 10 is the condensate detection device according to any one of claims 1 to 7, wherein the separation / collection means is a coal gasification gas. Is a cyclone or dust filter that separates char from coal, and means for collecting slag after the coal is gasified by oxidation reaction, and the condensate is fixed to the char separated by the cyclone or dust filter, And it is what was fixed to the collect | recovered slag.

  An apparatus for detecting a condensate according to an eleventh aspect of the present invention is the apparatus for detecting a condensate according to any one of claims 1 to 10, wherein the analysis means is water-soluble by washing with water. It is characterized by separating the condensate.

  Sodium, potassium, magnesium, and calcium can be detected as the condensate. And by deriving the situation of sodium chloride, potassium chloride, magnesium chloride, calcium chloride, the situation of sodium fluoride, potassium fluoride, magnesium fluoride, calcium fluoride, the chlorine and fluorine contained in coal gasification gas It is possible to derive the situation.

  The condensate detection apparatus of the present invention can accurately derive the state (concentration) of the condensate (impurities) of the coal gasification gas without directly analyzing the coal gasification gas.

It is a conceptual diagram of the condensate detection apparatus which concerns on one Example of this invention. It is a graph showing the time-dependent change of an impurity. 1 is an overall configuration diagram of a coal gasification combined power generation facility including a condensate detection device according to an embodiment of the present invention. 1 is a schematic system diagram of a dry gas purification facility. It is a graph showing the relationship between Na concentration and Cl concentration. And Cl concentration is a graph showing the relationship between the Na concentration, K concentration, Mg concentration, NH ₄ concentration. It is a graph showing the relationship between Ca concentration and Cl concentration. It is a graph showing the relationship between Na density | concentration and F density | concentration.

  In the coal gasification furnace, a coal gasification gas g is generated by a reaction between coal and an oxidizing agent (oxygen, air), and a substance containing carbon and ash is separated as char. Since the coal gasification gas h after the char is separated contains impurities such as halides, the impurities are removed and refined by the gas purification equipment to obtain the fuel gas f. If the status of the components (impurities) contained in the coal gasification gas h can be estimated in advance in the process of removing the impurities, the operation status of the coal gasification furnace and the gas generation facility can be planned. Since the coal gasification gas g is at a high temperature, the gas cannot be measured as it is, and impurities and the like cannot be directly detected from the coal gasification gas g.

  From the coal gasification gas g, carbon and ash components that are not gasified even in a high temperature state are separated as char by a cyclone or a dust filter. Char is recovered and put back into the coal gasifier, but if the temperature drops during the recovery process, some of the components in the surrounding gas become condensate, and the condensate is fixed to char or slag. .

  The inventor of the present application pays attention to the condensate that is condensed in the coal gasification gas g due to a decrease in temperature and fixed to char or slag, and by analyzing the condensate, the condensable gas contained in the coal gasification gas h is analyzed. We found that the components can be derived. In other words, by analyzing the condensate, the condensable substance itself in the coal gasification gas h and the form of the compound of the condensable substance can be inferred, and the state of impurities such as halides can be derived. can do.

  The basic configuration of the condensate detection device will be described with reference to FIGS. FIG. 1 conceptually shows a schematic configuration of a condensate detection apparatus according to an embodiment of the present invention, and FIG. 2 shows a graph showing changes over time in impurities contained in char and coal gasification gas. It is.

  As shown in FIG. 1, a coal gasification furnace A is provided, and in the coal gasification furnace A, a coal gasification gas g is generated by a reaction between coal and an oxidant (oxygen, air). Substances containing carbon and ash that have not been gasified even in a high temperature state are separated as char by the separation / collection means B (for example, cyclone). The condensable substance present in the system of the coal gasifier A is condensed by a decrease in temperature and becomes a condensate and is fixed to the char. That is, the condensate is fixed to the char and separated and collected together with the char by the separation / collection means B.

  The char is separated by the separation / collection means B, and the state of the condensate fixed to the separated char is analyzed by the analysis means. That is, for example, elements of the condensable substance (impurity elements, etc.) are analyzed by separating and analyzing the water-soluble condensate by washing. Based on the state of the condensate analyzed by the analysis means, the state of the substance (impurities) derived from the condensate contained in the coal gasification gas h that has passed through the separation / collection means B is derived (derivation means).

  For example, when coal containing the amount (X) of an impurity substance depending on the coal type is used, the condensate derived from the impurity substance when the condensate (impurities) fixed to the char is separated by washing with water ( When the amount of (impurities) is (X / 2), it can be estimated that the substance of the amount (X / 2) of impurities is contained in the coal gasification gas h as a gaseous compound. Moreover, the form in the gas of the substance from which the condensate originates can be estimated by analyzing the other substance which is not an impurity itself as a condensate.

  As shown by a solid line in FIG. 2, it is assumed that the condensate (impurities) derived from the impurity substance fixed to the char gradually increases with time and gradually decreases after reaching the maximum amount. In this case, as indicated by a dotted line in FIG. 2, the impurities estimated to be contained in the coal gasification gas h gradually decrease with time and gradually increase after reaching a minimum amount.

  Thus, the state of impurities estimated to be contained in the coal gasification gas h can be derived by analyzing the condensate derived from the impurity substance fixed to the char. By being able to estimate the state of impurities, it is possible to select operating conditions and impurity removers, including the selection of coal types used in coal gasification furnaces and the supply of impurity removers in the impurity removal means of gas purification facilities. It is possible to plan the operating status of coal gasification furnaces and gas refining facilities, such as selection of operation methods such as appropriate intervals for switching packed reactors, and maintenance of various impurity removal devices according to the type of coal. Easy to do.

  Therefore, the state (concentration) of the coal gasification gas condensate (impurities) can be accurately derived without directly analyzing the impurities contained in the gas state in the coal gasification gas. The status of coal gasification gas can be reflected in maintenance plans.

  The separation / collection means B has been described with an example of separating and collecting char assuming a cyclone or dust filter, and collecting the condensate fixed to the char. It is also possible to recover the condensate fixed inside the pipe. It is also possible to insert a cooling probe into the coal gasification gas g path as separation / collection means and fix the condensate to the probe for recovery.

  The coal gasification combined power generation facility provided with the above-described detection device will be described with reference to FIG.

  FIG. 3 shows a schematic system for explaining the overall configuration of a combined coal gasification combined power generation facility equipped with a condensate detection device and a dry gas purification facility.

  The combined coal gasification combined power generation facility 1 shown in the figure includes a coal gasification furnace 2, and a coal gasification gas g is generated in the coal gasification furnace 2 by a reaction between coal and an oxidizing agent (oxygen, air). The coal gasification gas g is made into a coal gasification gas h from which char and condensable components have been separated by a cyclone 3 as a separation means, and purified by removing impurities in a dry gas purification facility 4 to be a fuel gas f. .

  The fuel gas f is sent to the combustor 6 of the turbine equipment 5. That is, the turbine equipment 5 includes a compressor 16 and a gas turbine 7, and compressed air and fuel gas f compressed by the compressor 16 are sent to the combustor 6. In the combustor 6, the fuel gas f is combusted, and the combustion gas is sent to the gas turbine 7 and expanded to obtain power. The exhaust gas from the gas turbine 7 is heat recovered by the exhaust heat recovery boiler 8, and after nitrogen oxides are removed by the flue gas denitration device 9, the exhaust gas is discharged from the chimney 10 to the atmosphere.

  On the other hand, the compressor 16 and the gas turbine 7 and the steam turbine 11 are connected in a coaxial state, and the generator 12 is connected to the steam turbine 11. The exhaust heat recovery boiler 8 is supplied with condensate obtained by condensing the exhaust steam of the steam turbine 11 with a condenser (not shown), and the exhaust heat recovery boiler 8 generates steam by the exhaust gas of the gas turbine 7. The steam generated in the exhaust heat recovery boiler 8 is sent to the steam turbine 11 to obtain power.

  The generator 12 is driven by the power of the gas turbine 7 and the steam turbine 11 connected in series, and combined power generation by the gas turbine 7 and the steam turbine 11 is performed.

  In the combined coal gasification combined power generation facility 1 having the above-described configuration, the coal gasification gas h is purified by the dry gas refining facility 4 by dry refining to obtain the fuel gas f.

  The dry gas purification equipment 4 will be described with reference to FIG.

  FIG. 4 shows a schematic system of the dry gas purification equipment 4. In addition, the same code | symbol is attached | subjected to the same member as the member shown in FIG.

As shown in the figure, in the dry gas purification facility 4, the coal gasification gas h in which char and condensable components are separated from the coal gasification gas g generated in the coal gasification furnace 2 is about 450 ° C. (above the dew point). The halide removal reactor 21 is provided at the most upstream side. The halide removal reactor 21 is a sodium-based halogen absorbent (for example, sodium aluminate: NaAlO) in a fixed-bed packed tank. ₂ ) is pelletized and filled. In the halide removal reactor 21, hydrogen chloride (HCl) and hydrogen fluoride (HF), which are halides, are simultaneously precisely removed.

A desulfurization device 22 is provided downstream of the halide removal reactor 21. The desulfurizer 22 is provided with a zinc ferrite desulfurizing agent, and sulfur compounds (H ₂ S, COS) contained in the coal gasification gas h are removed at about 450 ° C.

  A mercury removal reactor 23 is provided downstream of the desulfurization apparatus 22, and the mercury removal reactor 23 is filled with, for example, a copper-based absorbent that mainly absorbs mercury as a mercury absorbent. In the mercury removal reactor 23, mercury contained in the coal gasification gas h is removed at an operating temperature of about 180 ° C.

  Mercury is removed by the mercury removal reactor 23 to obtain a fuel gas f, which is sent to the combustor 6 (see FIG. 3) of the turbine equipment 5.

  In the dry gas purification equipment 4, the halide is precisely removed by the halide removal reactor 21, but the halogen absorption is based on the concentration of halogen (mainly HCl) detected (derived) by the condensate detector. The arrangement situation of the agent is appropriately constructed.

  That is, as shown in FIG. 3, a char hopper 18, a charlock hopper 19, and a weighing hopper 20 are provided downstream of the cyclone 3. The char separated by the cyclone 3 is sent to a char hopper 18, a charlock hopper 19, and a weighing hopper 20. That is, carbon and ash components that are not gasified even in a high temperature state are separated as char by the cyclone 3.

  The condensable substance existing in the system of the coal gasification furnace 2 is condensed by a decrease in temperature, and becomes a condensate and is fixed to the char. That is, the condensate is fixed to the char and separated and collected together with the char by the cyclone 3 (separation / collection means).

The char collected in the weighing hopper 20 is conveyed to the combustor 25 by N ₂ gas, and the carbon component is combusted and gasified together with the pulverized coal. The char circulates through the cyclone 3, the char hopper 18, the charlock hopper 19, and the weighing hopper 20 and is conveyed to the combustor 25. In the combustor 25, gasified gas is generated by reaction (combustion) of coal and char with an oxidizing agent, and the molten slag 26 is recovered.

  For this reason, the condensate contained in the molten slag 26 can be separated and collected (separation / collection means), and the condensate can be analyzed to derive impurities. Separation / collection of the condensate fixed to the molten slag 26 can be performed together with the following char collection or alone.

  Char collecting means 31 for collecting a part of the char of the weighing hopper 20 is provided, and the char collecting means 31 separates and analyzes the condensate fixed to the collected char so as to obtain alkali. Detection means 32 for detecting metals (Na, K) and alkaline earth metals (Mg, Ca) is provided. The detection means 32 analyzes the situation of alkali metals (Na, K) and alkaline earth metals (Mg, Ca), and based on the amount of Na, K, Mg, Ca, etc., condensable impurities such as Cl, The amount of F is estimated (analyzing means).

  The detection means 32 may be configured to directly detect impurities Cl and F.

  The status of halogen (Cl, F, etc.) estimated by the detection means 32 is sent to the derivation means 33. In the deriving unit 33, based on the state of halogen (Cl, F, etc.) estimated by the detecting unit 32, the state of Cl and F (mainly HCl concentration) contained in the coal gasification gas h after the char is separated. ) Is derived.

  A situation where the derivation means 33 derives the HCl concentration will be described.

  Chlorine and fluorine, which are halogens, are gaseous at the operating temperature of the coal gasification furnace 2, but condense as the temperature falls and adhere to char or the like as a condensate. At the operating temperature of the dry gas purification equipment 4, it condenses and solidifies as an alkali metal salt (sodium salt, potassium salt) and alkaline earth metal salt (calcium salt, magnesium salt) and adheres to char or the like. Further, at a lower temperature, ammonium chloride is produced and solidified.

  When separating the condensate and char fixed to char, sodium salt, potassium salt, calcium salt, magnesium salt and ammonium chloride are all water-soluble substances, and char components (coal ash and unburned carbon) are Since it does not dissolve in water, sodium salt, potassium salt, calcium salt, magnesium salt and ammonium chloride can be extracted with water and separated.

  Based on the halogen content contained in the coal, it is possible to estimate the HCl concentration (migration concentration) when the conversion rate to chlorine in the coal gasification gas is 100%. Further, the HCl concentration (condensation concentration) in the coal gasification gas can be estimated based on the sodium salt, potassium salt, calcium salt, magnesium salt or ammonium chloride fixed to the char.

  The relationship between alkali metal, alkaline earth metal and Cl will be described with reference to FIGS.

FIG. 5 shows the relationship between the water-soluble Na concentration (gas concentration conversion: ppm) and the water-soluble Cl concentration (gas concentration conversion: ppm) detected based on the condensed component fixed to the char (or / and the molten slag 26). FIG. 6 shows the relationship between the Cl concentration, the Na concentration, the K concentration, the Mg concentration, and the NH ₄ concentration analyzed based on the amount of the condensed component fixed to the char (or / and the molten slag 26). is there.

  As indicated by the circles in FIG. 5, the result was that the concentration of water-soluble Cl ions tended to increase in a state close to a proportional straight line (monovalent coefficient) with respect to the concentration of water-soluble Na ions. Thus, it is understood that the increase / decrease state of the water-soluble Na concentration is correlated with the increase / decrease state of the water-soluble Cl concentration.

  By estimating the increase / decrease state of the water-soluble Cl concentration based on the change in the water-soluble Na concentration detected based on the condensed component, the original state of the condensate element compound can be estimated. By grasping the type of coal in the correlation between the water-soluble Na concentration and the water-soluble Cl concentration, the operation status of the gasification facility, the characteristics of the equipment, etc., the change in the Cl concentration contained in the coal gasification gas h can be detected. Can be derived.

  As indicated by a circle and a dotted line in FIG. 6, the concentration of the water-soluble Na ion is close to the proportional relationship according to the proportional line of the monovalent coefficient (coefficient 1) with respect to the concentration of the water-soluble Cl ion. It can be seen that it corresponds.

  In addition, as indicated by ◇ in FIG. 6, the concentration of water-soluble K ions corresponds to the concentration of a monovalent coefficient (coefficient 1) relative to the concentration of water-soluble Cl ions. It can be seen that there is no clear correlation with Cl ions.

Further, as shown by ▽ in FIG. 6, it can be seen that the concentration of water-soluble NH ₄ ions is almost zero with respect to the concentration of water-soluble Cl ions. This, NH ₄ ions contained in the char is not ammonium chloride, ammonia coal gasification gas g is believed to be adsorbed. Therefore, it is estimated that ammonia exists in a gaseous state.

  Thus, it can be seen that, among alkali metals and alkaline earth metals, in particular, Na is almost bonded to Cl, and there is a correlation between Na and Cl. Therefore, it is possible to estimate Cl, which is a condensable impurity, based on the detected Na, which is an alkali metal, and to derive the concentration of Cl.

  Included in coal gasification gas h, in which the concentration of water-soluble Cl fixed to char (fixed to slag) is changed in accordance with the change in water-soluble Na concentration, and the Cl concentration in coal gasification gas h is reduced. Therefore, it can be determined that the concentration of Cl contained in the coal gasification gas h has not changed, or that the concentration of Cl contained in the coal gasification gas h has increased.

  For example, when it is determined that the water-soluble Cl concentration fixed to the char (fixed to the slag) is increased according to the water-soluble Na concentration, the Cl concentration contained in the coal gasification gas h is decreased. Judgment can be made.

  As described above, since the concentration of Na is highly correlated with the Cl concentration, by detecting the concentration of Na ions that are condensate fixed to char (fixed to slag), It is possible to estimate the HCl concentration (condensation concentration) which is the state of the impurity compound. For this reason, it is possible to accurately derive the state (concentration) of Cl that is an impurity of the coal gasification gas h.

  The relationship between other alkaline earth metals and Cl will be described with reference to FIG.

  FIG. 7 shows the relationship between the water-soluble Ca concentration (gas concentration conversion: ppm) and the water-soluble Cl concentration (gas concentration conversion: ppm) detected based on the condensed component fixed to the char (or / and the molten slag 26). Is shown.

  As indicated by Δ in FIG. 7, a result was obtained in which the concentration of water-soluble Cl ions tended to increase in accordance with the proportional line with respect to the concentration of water-soluble Ca ions. Thereby, it turns out that it is estimated that the increase / decrease state of water-soluble Ca density | concentration correlates with the increase / decrease situation of water-soluble Cl concentration. For this reason, the HCl concentration (condensation concentration) in the coal gasification gas h can be estimated by detecting the change in the water-soluble Ca concentration.

  The relationship between the alkali metal and F will be described based on FIG.

  FIG. 8 shows the relationship between the water-soluble Na concentration (gas concentration conversion: ppm) and the water-soluble F concentration (gas concentration conversion: ppm) detected based on the condensed component fixed to the char (or / and the molten slag 26). Is shown.

  In the case of coal A with different coal types, as shown by □ in FIG. 8, the result of the tendency that the concentration of water-soluble F ions rapidly increases with respect to the concentration of water-soluble Na ions is shown in FIG. Obtained. In the case of B charcoal, the concentration of water-soluble F ions tends to increase in a state close to a proportional straight line (monovalent coefficient) with respect to the concentration of water-soluble Na ions, as indicated by x in FIG. Some results were obtained. Thereby, it turns out that it is estimated that the increase / decrease state of water-soluble Na density | concentration is related to the increase / decrease situation of water-soluble F density | concentration according to charcoal type.

  For this reason, the HF concentration (condensation concentration) in the coal gasification gas h can be estimated by detecting the change in the Na concentration.

  Thus, since the concentration of Na is highly correlated with the F concentration, the concentration of Na ions, which are condensate fixed to the char (fixed to the slag), is detected to detect the concentration of Na ions in the coal gasification gas h. It is possible to estimate the HF concentration (condensation concentration) which is the state of the impurity compound. For this reason, it is possible to accurately derive the state (concentration) of F that is an impurity of the coal gasification gas h.

  It should be noted that other metals can be detected as alkali metals and alkaline earth metals. Further, impurities other than Cl and F can be applied as the derived impurities.

  The condensate detection apparatus described above can accurately derive the state (concentration) of impurities in the coal gasification gas. The dry gas purification facility 4 includes a condensate detection device that can accurately derive the state (concentration) of impurities in the coal gasification gas.

  The present invention can be used in the industrial field of a condensate detection device that detects the state (concentration) of impurities in coal gasification gas.

DESCRIPTION OF SYMBOLS 1 Coal gasification combined cycle power generation equipment 2 Coal gasification furnace 3 Cyclone 4 Dry-type gas purification equipment 5 Turbine equipment 6 Combustor 7 Gas turbine 8 Waste heat recovery boiler 9 Flue gas denitration device 10 Chimney 11 Steam turbine 12 Generator 16 Compressor 18 Char hopper 19 Charlock hopper 20 Weighing hopper 21 Halide removal reactor 22 Desulfurization equipment 23 Mercury removal reactor 25 Combustor 26 Molten slag

Claims (11)

Separation and collection means for separating and collecting the condensate present in the coal gasifier system;
An analysis means for analyzing the condensate separated by the separation / collection means;
Deriving means for deriving the state of impurities contained in the gaseous form in the coal gasification gas after the condensate is separated by the separation / collection means based on the state of the condensate analyzed by the analyzing means A condensate detection device characterized by comprising: The condensate detection device according to claim 1,
In the analysis means, an analysis means for analyzing the condensate condensed by the reaction with alkali metal or alkaline earth metal,
Deriving means for deriving the state of impurities contained in the gaseous form in the coal gasification gas after the condensate is separated by the separation / collection means based on the state of the condensate analyzed by the analyzing means A condensate detection device characterized by comprising: In the condensate detection device according to claim 2,
The analysis means detects the alkali metal and alkaline earth metal by analyzing the condensate, and estimates condensable impurities based on the detected alkali metal and alkaline earth metal.
The deriving means shall derive the state of impurities contained in the gaseous form in the coal gasification gas after being separated by the separation / collection means based on the state of condensable impurities estimated by the analyzing means. Condensate detection device characterized by. In the condensate detection device according to claim 3,
In the derivation means, when the concentration of impurities contained in the condensate decreases based on the concentration of condensable impurities estimated by the analysis means, the concentration of impurities contained in the gaseous state in the coal gasification gas. A condensate detection device characterized by deriving the state of impurities based on the judgment that the value has become high. The condensate detection device according to claim 1,
The deriving means is characterized in that the state of impurities contained in the gaseous state in the coal gasification gas after the condensate is separated by the separating / collecting means is derived. In the condensate detection apparatus according to claim 5,
The analytical tool estimates the concentration of condensable impurities,
The deriving means derives the concentration of impurities contained in the coal gasification gas in a gaseous state according to the concentration of impurities contained in the condensate. The condensate detection device according to claim 6,
In the deriving means, when the concentration of impurities contained in the condensate decreases, it is judged that the concentration of impurities contained in the gaseous state in the coal gasification gas has increased, and the state of impurities is derived. A condensate detection device. In the condensate detection apparatus as described in any one of Claims 1-7,
The separation / collection means is a cyclone or dust filter that separates char from coal gasification gas,
A condensate detection device characterized in that the condensate is separated by a cyclone or dust filter and fixed to the char. In the condensate detection apparatus as described in any one of Claims 1-7,
In the condensate detection apparatus according to claim 1 or 2,
Separation / collection means is means for recovering slag after coal is gasified by oxidation reaction,
The condensate is fixed to the recovered slag. The condensate detection device. In the condensate detection apparatus as described in any one of Claims 1-7,
Separation / collection means are a cyclone or dust filter for separating char from coal gasification gas, and means for collecting slag after coal is gasified by oxidation reaction,
The condensate is fixed to a char separated by a cyclone or a dust filter and fixed to a recovered slag. In the condensate detection device according to any one of claims 1 to 10,
A condensate detection device characterized in that the analysis means separates the water-soluble condensate by washing with water.

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