CN217484237U - Measuring system for water content of IGCC (integrated gasification combined cycle) gas synthesis gas - Google Patents

Abstract

The utility model provides a measurement system for IGCC gas synthesis gas water content, including cooling dewatering device, trace water analyzer, first trachea, second trachea, the entry of first trachea is connected with IGCC's synthetic gas pipeline, and the export of first trachea communicates with the entry of cooling dewatering device, the entry of second trachea communicates with the export of cooling dewatering device, and the export of second trachea is connected with the entry of trace water analyzer, first trachea sets up the sample valve; a measurement system for be used for IGCC gas synthesis gas water content, not only system pipeline simple structure, the detection operation of being convenient for is favorable to improving detection efficiency, can ensure in addition that the water content that final measurement is confirmed is unanimous with actual water content to the at utmost, is favorable to improving the precision of water content testing result.

Description

Measuring system for water content of IGCC (integrated gasification combined cycle) gas synthesis gas

Technical Field

The utility model relates to a technical field of IGCC coal chemical industry, in particular to a measurement system for IGCC gas synthesis gas water content.

Background

An IGCC (integrated Gasification Combined cycle) integrated Gasification Combined cycle power generation system is an advanced power system combining a coal Gasification technology and a high-efficiency Combined cycle. The synthesis gas produced by the gasification furnace contains about 26 vol% of hydrogen, the hydrogen has the combustion characteristics of wide combustible interval of mixing with air, low ignition point, high combustion propagation speed, high backfire risk, high and unstable flame temperature, low blow-out limit and the like, and the combustion characteristic of the hydrogen also determines that the IGCC gas turbine cannot adopt a premixed low-nitrogen combustion mode (namely, the natural gas calorific value is diluted by injecting air before being sent into the gas turbine for combustion so as to realize low-nitrogen combustion) like a conventional natural gas turbine.

In the existing IGCC combustion engine, steam is injected to dilute the calorific value of the synthesis gas before the synthesis gas is fed into the combustion engine for combustion, so that the flame temperature is reduced, the generation of NOx is inhibited, and low-nitrogen combustion is realized; generally, the lower heating value engine requires about 2/3 lower heating value of inlet fuel than a conventional natural gas engine (inlet heating value of about 35GJ for a conventional natural gas engine and about 11GJ for a lower heating value engine). For the low-heat-value combustion engine of the IGCC, the injected steam quantity directly influences the dilution degree of the heat value, and meanwhile, the statistics of the steam consumption also relates to economic calculation; for this reason, the water content in the IGCC gas syngas needs to be detected to control the amount of steam injected. If the monitoring of the moisture in the process gas is lost in the IGCC production process, the feedback signal of the control device for injecting the steam is directly lost, the combustion process of the combustion engine is affected, and even the combustion engine device is burnt.

In the prior art, detection equipment such as a dew point meter, a micro-water meter, a hygrometer and the like are often adopted for detecting the content of moisture in mixed gas, and the gas is subjected to component analysis by adopting chromatography and spectrometry. However, in the practical application process, for example: conventional complete absorption electrolytic micro-water meter, AL ₂ O ₃ The capacitance dew point meter is generally used for measuring a low humidity range (0-30%). Resistive, wet and dry bulb, mechanical hygrometers can only be used for relative humidity measurements. Cold mirror type, film capacitance type hygrometerThe method can be used in a low-humidity range, a medium-humidity range (30-80%) and a high-humidity range (80-100%), and the measurement result is relatively accurate and reliable, but the method has the defects of high price and need of operation and maintenance by experienced people. In the medium and high humidity range, such as the use of a cold mirror type or a thin film capacitance type hygrometer, it is required to ensure that the gas is relatively clean and cannot contain corrosive substances or precipitate salt substances. Otherwise, the situations of polluting a measuring chamber and a detector easily occur, so that the instrument is misaligned or even damaged. In the process of analyzing gas components, the chromatograph and the spectrometer have high requirements on the measurement environment, and the measuring instrument is expensive and is not favorable for on-line sample measurement.

For the process gas in the IGCC production process, the components are complex, the process gas not only contains a large amount of water vapor (more than 30 percent), but also often contains corrosive media or substances which are easy to separate out salts, and if the water content is directly detected by conventional detection equipment according to the prior art, the corrosion and the damage of instruments are easy to occur, the detection data is inaccurate, and the industrial process production process is further influenced. In order to solve the problem of detecting the water content in the IGCC gas synthesis gas, the applicant proposed a patent application CN202210146319.X in the early research process, the wet synthesis gas is dehydrated through a constant-temperature condensing device, the water in the wet synthesis gas is removed, and the water content is determined by calculating the water content ratio through mass comparison before and after condensation. However, the pipeline structure of the whole measuring system is complex, the detection efficiency is low, and the finally determined water content and the actual water content have certain deviation, so that the result accuracy of water content detection is not high.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model aims at providing a measurement system for IGCC gas synthesis gas water content to solve the system pipeline structure that prior art exists at IGCC gas synthesis gas online moisture measurement in-process complicated, detection efficiency is lower, the not high scheduling problem of testing result precision.

In order to achieve the above purpose, the technical scheme of the utility model is realized as follows:

the utility model provides a measurement system for IGCC gas synthesis gas water content, includes cooling dewatering device, trace water analyzer, first trachea, second trachea, first tracheal entry is connected with IGCC's synthetic gas pipeline, first tracheal export and the entry intercommunication of cooling dewatering device, the tracheal entry of second communicates with cooling dewatering device's export, and the tracheal export of second is connected with trace water analyzer's entry, first trachea sets up the sample valve.

Furthermore, the first air pipe is provided with a heat tracing and heat insulating structure.

Further, a first mass flow meter is arranged at an inlet of the cooling and dewatering device, and the cooling and dewatering device is connected with the first air pipe through the first mass flow meter; and a second volume flowmeter is arranged at an outlet of the cooling and dewatering device, and the cooling and dewatering device is connected with a second air pipe through the second volume flowmeter.

Preferably, the first and second mass flowmeters are both coriolis force mass flowmeters.

Furthermore, the cooling and dewatering device is provided with a drain pipe, and a drain valve is arranged in the drain pipe.

Further, an emptying pipe is arranged at the outlet of the trace water analyzer.

Preferably, the trace water analyzer is an online dew point meter.

Furthermore, a sampling valve, a first isolation valve, a first pressure reducing valve, a first volume flow meter and a second isolation valve are sequentially arranged in the first air pipe.

Furthermore, a third isolation valve, a second pressure reducing valve and a second volume flow meter are sequentially arranged in the second air pipe.

Furthermore, the measuring system comprises a signal collector and a data processing device, wherein one end of the signal collector is respectively connected with the first mass flow meter, the second mass flow meter and the trace water analyzer, and the other end of the signal collector is connected with the data processing device.

Compared with the prior art, the utility model a measurement system for IGCC gas synthesis gas water content have following advantage:

a measurement system for be used for IGCC gas synthesis gas water content, compare with prior art, not only system pipeline simple structure, the detection operation of being convenient for is favorable to improving detection efficiency, detects the processing through the residual water volume B who surveys condensation water volume A, little water analyzer moreover, can ensure to the utmost that the final water content that measures confirms is unanimous with actual water content, is favorable to improving the precision of water content testing result. In addition, after the gas synthesis gas is dehydrated through the cooling and dehydrating device, the residual water amount B is detected by the micro water content analyzer, on the one hand, the data of all water contained in the gas synthesis gas are acquired as far as possible, on the other hand, the humidity of the gas synthesis gas is reduced, and conventional water content detection equipment can be directly applied to the measurement system, the normal stable operation of the water content detection equipment can be effectively guaranteed, the accurate degree of the data of the residual water amount B is ensured simultaneously, and the detection accuracy of the whole measurement system is favorably improved.

Drawings

The accompanying drawings, which form a part hereof, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without undue limitation. In the drawings:

fig. 1 is a schematic structural diagram of a measurement system for measuring the water content of IGCC gas syngas according to an embodiment of the present invention.

Description of reference numerals:

1. a sampling valve; 2. a first isolation valve; 3. a first pressure reducing valve; 4. a first volumetric flow meter; 5. a second isolation valve; 6. a first mass flow meter; 7. a cooling dehydration device; 8. a second mass flow meter; 9. a third isolation valve; 10. a second pressure reducing valve; 11. a second volumetric flow meter; 12. a trace water analyzer; 13. a signal collector; 14. a data processing device; 15. a drain pipe; 151. a drain valve; 16. a heat tracing insulation structure; 17. a temperature controller; 18. a first air pipe; 19. a second air pipe; 20. an emptying pipe; 21. a syngas line.

Detailed Description

The inventive concepts of the present disclosure will be described hereinafter using terms commonly employed by those skilled in the art to convey the substance of their work to others skilled in the art. These utility concepts may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

It should be noted that, in the case of no conflict, the embodiments and features of the embodiments of the present invention may be combined with each other.

The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

In the prior art, the process gas in the IGCC production process has complex components, not only contains a large amount of water vapor (more than 30 percent), but also often contains corrosive media or substances which are easy to separate out salts, and the conventional water content detection equipment is often difficult to directly use; the existing IGCC gas synthesis gas water content measuring system is complex in pipeline structure and low in detection efficiency, and finally determined water content and actual water content have certain deviation, so that the result accuracy of water content detection is low.

In order to solve the problems of complex system pipeline structure, low detection efficiency, low detection result accuracy and the like in the online moisture measurement process of the IGCC gas in the prior art, the embodiment provides a measurement system for the water content of the IGCC gas, as shown in fig. 1, the measurement system is communicated with a synthesis gas pipeline 21 of the IGCC, and is used for detecting the water content of the gas synthesis gas in the synthesis gas pipeline 21. In the present application, the gas syngas in the syngas line 21 refers to a mixed gas into which medium-pressure saturated steam has been mixed and injected, and may also be referred to as a process gas, where a typical gas syngas includes nitrogen, hydrogen, carbon monoxide, methane, carbon dioxide, water, and other components; in a conventional IGCC syngas line 21, the process parameters in the line are controlled at about 250 ℃ and 2.5MPa, although other operating parameters may be used in the syngas line 21, subject to actual IGCC operating conditions.

The measuring system comprises a cooling dehydration device 7, a trace water analyzer 12, a first air pipe 18 and a second air pipe 19, wherein the inlet of the first air pipe 18 is connected with a synthetic gas pipeline 21 of the IGCC, the outlet of the first air pipe 18 is communicated with the inlet of the cooling dehydration device 7, the inlet of the second air pipe 19 is communicated with the outlet of the cooling dehydration device 7, the outlet of the second air pipe 19 is connected with the inlet of the trace water analyzer 12, and the first air pipe 18 is provided with a sampling valve 1.

When detection is carried out, firstly, the sampling valve 1 is opened, a part of the gas synthetic gas in the synthetic gas pipeline 21 enters the first gas pipe 18, then the gas synthetic gas flows to the cooling dehydration device 7 for cooling, condensation and dehydration, the amount of condensed water separated out from the gas synthetic gas is marked as A, the gas synthetic gas after dehydration treatment flows to the trace water analyzer 12 through the second gas pipe 19, trace water remained in the gas synthetic gas is measured by the trace water analyzer 12, the amount of residual water measured by the trace water analyzer 12 is marked as B, and accordingly, the water content of the gas synthetic gas can be obtained by carrying out comprehensive treatment calculation on A, B. In addition, the sampling valve 1 is closed after detection is not needed or the gas synthesis gas sampling is finished. Simultaneously, this application is the gas sampling gas of a definite amount in the gas synthetic gas of testing process.

Thereby compare with prior art, the measurement system in this embodiment not only system pipeline simple structure, the detection operation of being convenient for is favorable to improving detection efficiency, detects the processing through the residual water volume B who surveys condensation water yield A, little water analyzer 12 moreover, can ensure to the at utmost that the final water content that measures confirms is unanimous with actual water content, is favorable to improving the precision of water content testing result. In addition, after carrying out dehydration to gas synthetic gas through cooling dewatering device 7, recycle little water analyzer 12 and detect residual water volume B, be on the one hand in order to acquire the data of all moisture that contain in the gas synthetic gas as far as possible, on the other hand is especially in order to reduce the humidity back of gas synthetic gas for conventional water content check out test set can directly use among the measurement system, can effectively ensure water content check out test set's normal steady operation, ensure residual water volume B's accurate degree of data simultaneously, be favorable to improving whole measurement system's the detection accuracy nature.

Considering that when the gas synthesis gas enters the measuring system from the synthesis gas pipeline 21 during detection and sampling, temperature changes may exist, which easily causes moisture in the gas synthesis gas to be pre-condensed before entering the cooling and dehydrating device 7; in order to avoid this situation, the first air pipe 18 is provided with the heat tracing insulation structure 16 in the whole course, and the heat tracing insulation structure 16 is provided with the temperature controller 17, so that the heat tracing insulation structure 16 can stabilize the temperature in the first air pipe 18 at (230 ± 5) ° c, so that the moisture in the gas synthetic gas cannot be condensed before entering the cooling and dehydrating device 7, and the finally measured total moisture content is ensured to be consistent with the actual moisture content to the maximum extent, so as to improve the accuracy of the moisture content detection result.

The cooling temperature of the cooling dehydration unit 7 is set to (4 ± 1) ° c, so that most of the water in the gas syngas can be condensed and separated out. In addition, in order to ensure that the cooling temperature of the cooling dehydration device 7 is maintained at (4 ± 1) ° c, the cooling dehydration device 7 includes a temperature measuring element, a radiator, a cooling fan, and the like. Meanwhile, the cooling and dewatering device 7 is provided with a drain pipe 15, and a drain valve 151 is arranged in the drain pipe 15 and used for discharging condensed water remained in the cooling and dewatering device 7 after the gas synthesis gas is condensed and dewatered.

In the process of carrying out cooling dehydration on the gas synthesis gas by the cooling dehydration device 7, in order to improve the data detection accuracy of the condensed water amount A, a first mass flow meter 6 is arranged at the inlet of the cooling dehydration device 7, and a second volume flow meter 11 is arranged at the outlet of the cooling dehydration device 7, so that the cooling dehydration device 7 is connected with a first gas pipe 18 through the first mass flow meter 6 and is used for detecting the mass flow Q1 of the gas synthesis gas before dehydration treatment; the cooling dehydration device 7 is connected with the second gas pipe 19 through a second volume flow meter 11 and is used for detecting the mass flow Q2 of the dehydrated gas synthetic gas; therefore, the condition Q1-Q2 of the condensed water quantity can be simply, conveniently and accurately obtained, and the proportion K of the mass of the condensed water to the total mass of the gas-fuel synthesis gas can be directly obtained (Q1-Q2) ÷ Q1. Preferably, the first mass flow meter 6 and the second mass flow meter 11 are both coriolis mass flow meters, so as to further improve the accuracy of measurement.

And after the residual moisture in the dehydrated gas synthesis gas is detected, an emptying pipe 20 is arranged at the outlet of the trace water analyzer 12 and is used for emptying the sampled gas subjected to moisture content detection. Preferably, one end of the vent pipe 20 is connected with the outlet of the trace water analyzer 12, and the other end is provided with a conventional tail gas treatment device to reduce the occurrence of tail gas pollution.

For the arrangement of the trace water analyzer 12, the purpose is not only to detect the residual moisture in the dehydrated gas synthesis gas, but also to improve the accuracy of the detection result; because the cooling dehydration device 7 can remove most of moisture in the gas synthesis gas, the residual moisture entering the trace water analyzer 12 is relatively very small, the magnitude of the data is small, and even ppm can be used as a metering unit, if the detection result of the trace water analyzer 12 has large numerical fluctuation, such as the change of the magnitude, the cooling dehydration device 7 or other components may have faults, and the measuring system can also be provided with an alarm device to remind engineers of patrolling the cooling dehydration device 7 and even the whole measuring system in time to find whether related components have faults or not so as to reduce potential safety hazards and ensure the normal operation of the measuring system.

In addition, the preferred online dew point meter that is of trace water analyzer 12 for measure the dew point T of gas synthetic gas after the dehydration, thereby can simply conveniently acquire the corresponding water content of gas synthetic gas after the dehydration, not only can further improve the measuring accuracy, still be favorable to reducing the cost of whole set of measurement system.

In the sampling and detecting process, the gas synthesis gas can enter the measuring system more stably, so that impact on relevant parts in the measuring system is avoided; set gradually sample valve 1 in the first trachea 18, first isolating valve 2, first relief pressure valve 3, first volume flowmeter 4, second isolating valve 5, thereby opening sample valve 1, the in-process that the gas synthetic gas got into first trachea 18 from synthetic gas pipeline 21, the engineer can be through further adjusting first isolating valve 2, first relief pressure valve 3, the pressure of the gas synthetic gas of avoiding flowing through first trachea 18 is too big, the velocity of flow is too fast, simultaneously the engineer can directly acquire whether the gas synthetic gas flows steadily through the registration of first volume flowmeter 4, and adjust second isolating valve 5 according to relevant detection requirement simultaneously, make the gas synthetic gas can flow to cooling dewatering device 7 steadily relatively, reduce the air current impact to cooling dewatering device 7.

In order to ensure that the gas synthesis gas has enough residence time in the cooling and dehydrating device 7 and avoid the gas synthesis gas from impacting the trace water analyzer 12, the third isolation valve 9, the second pressure reducing valve 10 and the second volume flow meter 11 are sequentially arranged in the second gas pipe 19, by adjusting the third isolation valve 9 and the second pressure reducing valve 10, on one hand, the residence time of the gas synthesis gas in the cooling and dehydrating device 7 can be effectively regulated and controlled, on the other hand, the pressure and the flow rate of the gas synthesis gas flowing through the second gas pipe 19 can be prevented from being too high and too high, meanwhile, an engineer can directly obtain whether the gas synthesis gas flows stably through the indication of the second volume flow meter 11 and perform feedback adjustment on the third isolation valve 9 and the second pressure reducing valve 10, so that the gas synthesis gas can flow relatively stably to the trace water analyzer 12, and provide a stable detection environment for the detection of the trace water analyzer 12, the accuracy of the detection result is ensured.

In addition, in order to improve the automation degree of the measuring system, improve the detection efficiency and reduce the cost of manpower and material resources; the measuring system comprises a signal collector 13 and a data processing device 14, wherein one end of the signal collector 13 is respectively connected with the first mass flow meter 6, the second mass flow meter 8 and the trace water analyzer 12, and the other end of the signal collector 13 is connected with the data processing device 14, so that in the detection process, the signal collector 13 can automatically collect the detection data of Q1, Q2 and the trace water analyzer 12 and send the relevant data to the data processing device 14, the data processing device 14 automatically and efficiently analyzes and processes the relevant data, and the water content result of the IGCC gas synthesis gas is obtained. The data processing device 14 is a conventional data processing terminal, such as a computer; at the same time, the data processing device 14 may also be provided with a display structure for directly displaying the moisture content end result. Other prior art techniques may also be used for the specific configuration of the data processing device 14, which will not be described in detail.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. The measuring system for the water content of the IGCC gas synthesis gas is characterized by comprising a cooling dehydration device (7), a trace water analyzer (12), a first gas pipe (18) and a second gas pipe (19), wherein the inlet of the first gas pipe (18) is connected with a synthesis gas pipeline (21) of the IGCC, the outlet of the first gas pipe (18) is communicated with the inlet of the cooling dehydration device (7), the inlet of the second gas pipe (19) is communicated with the outlet of the cooling dehydration device (7), the outlet of the second gas pipe (19) is connected with the inlet of the trace water analyzer (12), and the first gas pipe (18) is provided with a sampling valve (1).

2. The system for measuring the water content of IGCC gas syngas of claim 1, characterized in that the first gas pipe (18) is provided with a heat tracing insulation structure (16).

3. A measurement system for the water content of IGCC gas synthetic gas according to claim 1, characterized in that, a first mass flow meter (6) is arranged at the inlet of the cooling dehydration device (7), the cooling dehydration device (7) is connected with a first gas pipe (18) through the first mass flow meter (6); and a second volume flow meter (11) is arranged at the outlet of the cooling dehydration device (7), and the cooling dehydration device (7) is connected with a second air pipe (19) through the second volume flow meter (11).

4. A measurement system for IGCC gas syngas water content according to claim 3, characterized in that the first (6) and second (11) mass flow meter are both coriolis force mass flow meters.

5. The system for measuring the water content of the IGCC gas synthesis gas according to the claim 1, characterized in that the cooling dehydration device (7) is provided with a water discharge pipe (15), and a water discharge valve (151) is arranged in the water discharge pipe (15).

6. The system for measuring the water content of the IGCC gas synthesis gas in accordance with claim 1, wherein the outlet of the trace water analyzer (12) is provided with a flare (20).

7. The system for measuring the water content of the IGCC gas synthesis gas in accordance with claim 1, wherein the trace water analyzer (12) is an on-line dew point meter.

8. The system for measuring the water content of the IGCC gas synthesis gas according to the claim 1, characterized in that the sampling valve (1), the first isolation valve (2), the first pressure reducing valve (3), the first volume flow meter (4) and the second isolation valve (5) are arranged in the first gas pipe (18) in sequence.

9. The measurement system for the water content of the IGCC gas synthetic gas in accordance with claim 1, wherein a third isolation valve (9), a second pressure reducing valve (10) and a second volume flow meter (11) are arranged in the second gas pipe (19) in sequence.

10. The system for measuring the water content of the IGCC gas synthesis gas according to the claim 1, characterized in that the system comprises a signal collector (13) and a data processing device (14), one end of the signal collector (13) is respectively connected with the first mass flow meter (6), the second mass flow meter (8) and the trace water analyzer (12), and the other end is connected with the data processing device (14).

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