CN213480914U - Energy-saving system for coupling utilization of pulverized coal drying and gasification byproduct steam - Google Patents
Energy-saving system for coupling utilization of pulverized coal drying and gasification byproduct steam Download PDFInfo
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- CN213480914U CN213480914U CN202021541440.5U CN202021541440U CN213480914U CN 213480914 U CN213480914 U CN 213480914U CN 202021541440 U CN202021541440 U CN 202021541440U CN 213480914 U CN213480914 U CN 213480914U
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Abstract
The utility model provides an economizer system that buggy drying and gasification by-product steam coupling utilized, the system is applied to the energy-conserving field of coal chemical industry technology, and the system includes coal pulverizer, filter I, circulating fan, heater, butterfly valve, filter II, condenser. From space division N2Or washing CO with methanol at low temperature2The coal dust drying heat requirement is met by heating medium-low pressure saturated steam from gasification byproducts, the dried coal dust enters a rotary separator to be separated under the drive of inert circulating air, and the separated gasMost of the gas is recycled after being pressurized by a circulating fan, and a small part of the gas is sent to a sulfur recovery incinerator or a thermoelectric boiler after being filtered and dehumidified. The utility model discloses a system utilizes through pulverized coal drying and gasification by-product steam coupling, outside saving synthetic gas, analytic gas is extravagant as the energy of fuel gas, realizes pulverized coal drying system inert gas environment completely, stops the buggy explosion probably, reduces the fuel gas burning completely simultaneously and produces moisture and the air and brings the possibility into system moisture.
Description
Technical Field
The patent of the utility model belongs to the energy-conserving field of coal chemical industry technology, concretely relates to energy-conserving method and system that pulverized coal drying and gasification byproduct steam coupling of fine coal gasification unit utilized.
Technical Field
In the coal gasification device, coal powder drying is a necessary key unit, and the coal powder drying effect and the oxygen concentration content directly determine the subsequent gasification process and the 'stable, long, full and excellent' operation of the whole process device;
wherein the pulverized coal drying generally generates hot gas supply heat through the combustion of synthesis gas or fuel gas and combustion air in a hot blast stove (inert gas generator), wherein the temperature of hot inert gas entering a coal mill is about 180-; the dried coal powder enters a rotary separator to be separated under the drive of inert circulating air, and the separated gas contains CO2：3-5％(vol)、H2O：25-30％(vol)、O2：6-7％(vol)、N2: 60-65% (vol), solid dust<10mg/Nm3(coal powder, sulfide, etc.) is pressurized by circulating fan, and most of gas circulatesThe rings are used and a small portion is vented to the atmosphere to reduce the water content in the hot inert gas, with a ratio of about 4: 1. Meanwhile, in order to prevent the explosion of the pulverized coal, the oxygen mole fraction of the system is lower than 8% by diluting the fresh inert gas, and simultaneously, in order to ensure that the subsequent pulverized coal conveying does not form agglomeration, the moisture content of the pulverized coal is required to be less than 2%.
In practical application, the moisture content of combustion air is influenced by environmental changes, and the oxygen component of hot gas generated by the hot blast stove is easy to react with trace hydrogen component in fuel gas to generate water, so that subsequent pulverized coal is agglomerated and conveying is influenced. Meanwhile, the oxygen content exceeds the standard easily due to the input change of combustion air, so that the coal dust explosion risk is greatly increased, and the synthesis gas, the analysis gas and the like are used as fuel gas, CO and H2High content, energy waste and high system energy consumption, and the effective gas components can be further purified and returned to the synthesis system for preparing chemicals.
Meanwhile, in a coal chemical system, a large amount of medium and low pressure saturated steam is generated as a byproduct in gasification, black water flash evaporation, transformation, sulfur recovery and synthesis, and energy waste caused by temperature and pressure reduction also exists.
In addition, in the wet-process acid making process of the sulfur recovery unit of the coal chemical device, high-temperature sulfuric acid steam is condensed to take away heat through air, part of heated air enters a sulfur incinerator to support combustion, and most high-temperature air is discharged, so that certain system energy is wasted.
Disclosure of Invention
Not enough to prior art exists, the utility model aims to provide an economizer system that buggy drying and gasification by-product steam coupling utilized solves among the prior art technical problem of buggy caking, buggy explosion risk, energy waste.
In order to solve the technical problem, the utility model discloses a following technical scheme realizes:
the system comprises a coal mill, a filter I, a circulating fan, a heater, a butterfly valve, a filter II, a condenser, a raw coal conveying pipeline, a pulverized coal conveying pipeline and a drying pipelinePulverized coal-fed gas pipeline, inert gas pipeline fed into heater, high-temperature inert gas pipeline, vent gas inlet filter II pipeline, filtered vent gas pipeline, dehumidified vent gas pipeline (fed into sulfur recovery incinerator or thermoelectric boiler), N-type natural gas from air separation2Or washing CO with methanol at low temperature2A pipeline, a pipeline for medium and low pressure saturated steam from gasification (or black water flash evaporation, transformation, sulfur recovery and synthesis) by-products, a high temperature condensed water pipeline, a circulating water inlet pipeline and a circulating water outlet pipeline;
furthermore, the coal mill, the filter I, the circulating fan and the heater pass through a raw material coal conveying pipeline, a coal powder conveying pipeline, a gas pipeline after drying coal powder, an inert gas pipeline entering the heater, a high-temperature inert gas pipeline and a pipeline from air separation N2Or washing CO with methanol at low temperature2The pipelines are communicated in sequence to form a circulating channel for drying the pulverized coal;
furthermore, the butterfly valve, the filter II and the condenser are sequentially communicated through an air emptying inlet filter II pipeline, a filtered air emptying pipeline and a dehumidified air emptying pipeline to form an air emptying processing channel;
furthermore, the heating medium of the heater is medium-low pressure saturated steam from gasification (or black water flash evaporation, transformation, sulfur recovery and synthesis) byproducts, the heated medium is inert gas, and the heated medium is used by other devices outside a generated high-temperature condensed water system;
furthermore, the cooling medium of the condenser is circulating water, the cooled medium is the filtered air, and the condensed water can be sent to water treatment for further treatment or used as water supplement of other systems;
furthermore, the opening and closing degree of the butterfly valve is determined according to the concentration of moisture and impurities released by pulverized coal in the system;
further, the vent gas after being filtered and dehumidified is sent to a sulfur recovery incinerator or a thermoelectric boiler, so that the combustible components and the sulfur components in the vent gas are recycled;
furthermore, the energy-saving system for coupling utilization of the coal dust drying and gasification byproduct steam completely realizes an inert gas environment of the coal grinding drying system, avoids moisture content and oxygen in the environment, and ensures safe and reliable operation of the system.
Compared with the prior art, the utility model, following technological effect has:
the utility model discloses a system utilizes through pulverized coal drying and gasification by-product steam coupling, outside saving the synthetic gas, analytic gas is extravagant as the energy of fuel gas, realizes pulverized coal drying system inert gas environment completely, stops the buggy explosion probably, reduces the fuel gas burning completely simultaneously and produces moisture and air and brings into the possibility of system moisture, guarantees to realize that pulverized coal moisture content requires < 2% technological requirement, stops follow-up buggy and carries the caking probably. Finally, the system is low in cost, safe and long in period operation.
Drawings
Fig. 1 is a schematic view of an energy saving system for coupling utilization of coal dust drying and gasification byproduct steam.
The meaning of each reference number in the figures is: 1-coal mill, 2-filter I, 3-circulating fan, 4-heater, 5-butterfly valve, 6-filter II, 7-condenser, 8-raw material coal conveying pipeline, 9-coal powder conveying pipeline, 10-gas pipeline after drying coal powder, 11-inert gas pipeline entering heater, 12-high temperature inert gas pipeline, 13-air inlet filter II pipeline, 14-filtered air discharge pipeline, 15-dehumidified air discharge pipeline (sulfur-feeding recovery incinerator or thermoelectric boiler), 16-condensed water pipeline, 17-N-air separation-derived air discharge pipeline2Or washing CO with methanol at low temperature2A pipeline, an 18-low pressure saturated steam pipeline from gasification (or black water flash evaporation, transformation, sulfur recovery and synthesis) by-products, a 19-high temperature condensed water pipeline, a 20-circulating water inlet pipeline and a 21-circulating water outlet pipeline.
Note: reference numeral 6 is a dotted frame, which indicates whether the setting is selectable according to the specific situation.
The following detailed description of the present invention will be made with reference to the accompanying drawings.
Detailed Description
Specific examples of the present invention are given below.
According to the technical scheme, as shown in figure 1, the utility modelThe system comprises a coal mill 1, a filter I2, a circulating fan 3, a heater 4, a butterfly valve 5, a filter II 6, a condenser 7, a raw material coal conveying pipeline 8, a coal powder conveying pipeline 9, a gas pipeline 10 after drying coal powder, an inert gas pipeline 11 for a heater, a high-temperature inert gas pipeline 12, an emptying gas inlet filter II pipeline 13, an emptying gas pipeline 14 after filtering, an emptying gas pipeline 15 after dehumidification (a sulfur-feeding recovery incinerator or a thermoelectric boiler), and a pipeline from an air separation N2Or washing CO with methanol at low temperature2A pipeline 16, a pipeline 17 for medium and low pressure saturated steam from gasification (or black water flash evaporation, transformation, sulfur recovery and synthesis) by-products, a high temperature condensed water pipeline 18, a circulating water inlet pipeline 19 and a circulating water outlet pipeline 20.
Furthermore, the coal mill 1, the filter I2, the circulating fan 3 and the heater 4 are connected with the air separation N through a raw material coal conveying pipeline 8, a coal powder conveying pipeline 9, a gas pipeline 10 after drying coal powder, an inert gas pipeline 11 for feeding the heater, a high-temperature inert gas pipeline 12 and the air separation N2Or washing CO with methanol at low temperature2The pipelines 13 are communicated in sequence to form a circulating channel for drying the pulverized coal;
further, the butterfly valve 5, the filter II 6 and the condenser 7 are sequentially communicated with one another through an air emptying inlet filter II pipeline 13, a filtered air emptying pipeline 14 and a dehumidified air emptying pipeline 15 to form an air emptying processing channel;
further, the heating medium of the heater 4 is medium-low pressure saturated steam from gasification (or black water flash evaporation, transformation, sulfur recovery and synthesis) byproducts, the heated medium is inert gas, and the generated high-temperature condensed water is used by other devices outside the system;
furthermore, the cooling medium of the condenser 7 is circulating water, the cooled medium is filtered vent gas, and the condensed water can be sent to water treatment for further treatment or used as water supplement of other systems;
further, the opening and closing degree of the butterfly valve 5 is determined according to the moisture and impurity concentration released by pulverized coal in the system;
furthermore, the vent gas after being filtered and dehumidified is sent to a sulfur recovery incinerator or a thermoelectric boiler, so that the recovery and utilization of combustible components and sulfur components in the vent gas are ensured.
As shown in fig. 1, the work flow of the system is as follows: from space division N2Or washing CO with methanol at low temperature2The coal dust drying heat requirement is met by heating medium and low pressure saturated steam from gasification (or black water flash evaporation, transformation, sulfur recovery and synthesis) byproducts, wherein the temperature of hot inert gas entering a coal mill is about 180 ℃ and 250 ℃, and the temperature of an outlet of the coal mill does not exceed 110 ℃; the dried pulverized coal enters a rotary separator to be separated under the drive of inert circulating air, most of the separated gas is recycled after being pressurized by a circulating fan, and a small part of the separated gas is sent to a sulfur recovery incinerator or a thermoelectric boiler after being filtered and dehumidified, so that the oxygen mole fraction of the system is ensured to be stably lower than 8% while the moisture released by the pulverized coal is recovered, and the moisture content of the pulverized coal is lower than 2%.
The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is familiar with the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered in the protection scope of the present invention.
Claims (8)
1. The utility model provides an economizer system that buggy is dry and gasification by-product steam coupling utilizes, the system is applied to coal chemical industry technology energy-conserving field, including coal pulverizer (1), coal pulverizer (1) entry connects raw materials coal pipeline (8), a serial communication port, still include filter I (2), circulating fan (3) and heater (4), filter I (2), circulating fan (3) and heater (4) are through buggy pipeline (9), gas pipeline (10) behind the dry buggy, inert gas pipeline (11) of advancing the heater connect gradually, return coal pulverizer (1) by high temperature inert gas pipeline (12) at last, form the dry circulating channel of buggy.
2. The coal dust drying and gasification byproduct steam coupling utilization energy-saving system according to claim 1, further comprising a filter II (6) and a condenser (7), wherein the emptying air inlet filter II pipeline (13), the filtered emptying air pipeline (14), the dehumidified emptying air pipeline (15) and the condensed water pipeline (16) are sequentially communicated to form an emptying air processing channel.
3. The coal dust drying and gasification byproduct steam coupling utilization energy-saving system according to claim 1, wherein the heater (4) is used for heating medium from low-pressure saturated steam in the gasification byproduct, the heated medium is inert gas, and the generated high-temperature condensed water is discharged and reused through the high-temperature condensed water pipeline (19).
4. The coal dust drying and gasification byproduct steam coupled energy-saving system according to claim 2, wherein the cooling medium of the condenser (7) is circulating water, or air or a medium with a temperature not higher than 50 ℃, and the cooled medium is filtered vent gas.
5. The coal dust drying and gasification byproduct steam coupled utilization energy-saving system according to claim 2, wherein the indirect heat exchange structures of the heater (4) and the condenser (7) comprise one of a shell-and-tube type, a plate-and-shell type and a fin type.
6. The coal dust drying and gasification byproduct steam coupling utilization energy-saving system according to claim 1, characterized by further comprising a butterfly valve (5) arranged on the second pipeline (13) of the air emptying air inlet filter, wherein the opening and closing degree of the butterfly valve (5) is determined according to the moisture and impurity concentration released by the coal dust, so as to ensure that the oxygen mole fraction is stably lower than 8% and the moisture content of the coal dust is less than 2%.
7. The coal dust drying and gasification byproduct steam coupled energy-saving system according to claim 1, further comprising N from air separation2Or washing CO with methanol at low temperature2The pipeline (17) and the pipeline (18) from the gasification by-product medium-low pressure saturated steam are communicated with the heater (4) to participate in circulation.
8. The coal dust drying and gasification byproduct steam coupled energy-saving system according to claim 2, wherein the condenser (7) is connected with a circulating water inlet pipeline (20) and a circulating water outlet pipeline (21).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021541440.5U CN213480914U (en) | 2020-07-29 | 2020-07-29 | Energy-saving system for coupling utilization of pulverized coal drying and gasification byproduct steam |
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| CN202021541440.5U CN213480914U (en) | 2020-07-29 | 2020-07-29 | Energy-saving system for coupling utilization of pulverized coal drying and gasification byproduct steam |
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| CN213480914U true CN213480914U (en) | 2021-06-18 |
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