45 results about "Coal rank" patented technology

The invention relates to a thermal power unit coal heat value real-time monitoring method and a heat value observer thereof. The invention comprises the following steps: 1) based on the dynamic characteristics of the thermal power unit, the heat value observer is established by the energy conservation law; 2) during the stable operation of an actual operating unit under the conditions of the designed coal rank and various loads, the corresponding relation among all the operation parameters of the actual operating unit can be searched in a DCS control system; 3) according to the probability statistics on the operation parameters of the actual operating unit, the static configuration and the dynamic configuration of the parameters of the unit model are carried out, and thus the unit model can be perfectly matched with the actual operating unit; 4) according to the coal consumption signal which is measured in site and the current operation parameters of the unit, the heat value observer can get a heat-value modified parameter through calculation, and the modified parameter can modifies the coal consumption signal in site to obtain the standard coal consumption signal. The application in site shows that the monitoring method and the observer can perfectly make the online real-time monitoring of the changes of the coal heat value, and thus the control system can perfectly overcome the interference on the boiler combustion due to the coal quality variation.

The invention discloses a coal-bed gas-content calculation method including: selecting a series of coal-core samples of a tested area; measuring a corresponding maximum vitrinite reflectivity Rmax of each coal-core sample and a well log value of each of corresponding well sections of the coal-core samples; establishing a relationship between the maximum vitrinite reflectivities Rmax and coal-bed gas-content parameters R; and establishing a calculation formula of the coal-bed gas content Vgas according to the well log values and the coal-bed gas-content parameters R. Through introduction of the vitrinite reflectivity, the coal-bed gas-content calculation method takes an effect of coal rank on the coal-bed gas content into full consideration so that the calculated coal-bed gas content complies with an actual geological condition in a better way. And at the same time, the coal-bed gas content is convenient to obtain and low in cost because of being capable of being obtained only based on the well logging information and the vitrinite reflectivity. Moreover, coal-bed gas content of continuous well sections can be obtained so that application effect is good.

The invention discloses a biological permeability-increasing method for a coal reservoir, which comprises the following steps in turn: (1) selecting a middle/low-class coal reservoir; (2) forming a channel for injecting liquid into the coal reservoir in a drilling mode or other mode; (3) selecting and culturing microorganism strains suitable for an anaerobic environment and capable of effectively utilizing coal; (4) injecting the nutrient liquid containing the microorganism strains into the coal reservoir in a hydraulic fracturing mode or other mode; (5) confirming shutdown time of a well according to the difference of the coal rank; (6) organizing the subsequent production according to the conventional coal-bed gas well draining extraction or gas extraction process; and (7) checking an effect. A permeability-increasing technology for the coal reservoir is a key point for the coal bed gas resource development and the coal mine gas treatment. The invention provides the permeability-increasing technology utilizing the biotechnology for the middle/low-class coal reservoir; the coal is degraded by the microorganisms, so that the purpose of increasing the permeability of the coal reservoir is achieved; and the biological permeability-increasing method for the coal reservoir has a significance in promoting the coal bed gas resource development and the coal mine gas extraction.

The invention relates to a technology for determining coal bed intensity by using coal ash, which is suitable for the technical field of well wall stabilization in well drilling for coal bed methane. The method comprises the following steps of: classifying, cleaning, baking and crushing coal rock debris obtained by logging, performing proximate analysis of coal according to the national standard, and determining the ratio of ash to volatile; judging the coal grade of the coal rock according to the volatile value; selecting the corresponding empirical formula of the relationship between the ash and the intensity according to the coal grade and calculating the intensity of coal rock blocks; and solving the coal reservoir intensity by combining a geological strength index (GSI) value and applying a Hoek-Brown rock mass strength empirical formula. The method is provided by combining the field on the basis of the Hoek-Brown rock mass strength empirical formula, and is suitable for the requirement for acquiring the parameters of the coal bed intensity in the well wall stabilization prediction of well drilling for the coal bed methane, and the prediction method is simple and has a good effect.

The invention relates to a coal reservoir water locking damage control method, which comprises the following steps that:1, a ground coal-bed gas well subjected to fracturing transformation is selected; 2, reservoir coal samples are collected on sites, and the contact angle of water on the coal sample surface is tested in an indoor position; 3, quickly penetrating agents T and chlorine dioxides are added into fracturing fluid, the concentration of the quickly penetrating agents T is selected according to the contact angle of the water on the coal sample surface, and the concentration of the chlorine dioxide is selected according to the coal rank of the coal samples (the metamorphism degree of the coal samples); 4, after the quickly penetrating agents T and the chlorine dioxides are added, the uniformly stirred fracturing fluid can be used as ahead fluid, or is used as sand-carrying fluid to be subjected to joint hydraulic fracturing with non-active water fracturing fluid, and 20 to 30 cubic meters of active water fracturing fluid needs to be pumped between the ahead fluid and the sand-carrying fluid for isolation; and 5, the fracturing fluid return and discharging can start only after at least 3 hours from the hydraulic fracturing completion. The coal reservoir water locking damage control method has the advantages that the capillary resistance and the surface tension of a coal-bed gas reservoir layer are reduced; the reservoir layer water locking damage is reduced; the coal-bed gas reservoir layer is favorably protected; and the coal-bed gas recovery rate is favorably improved.

The invention discloses a coalbed methane near-wellbore area chemical block removing method. The method sequentially includes (1) selecting a coalbed methane well which has serious-polluted coal reservoir near-wellbore area, obvious-decreased gas production or no gas production; (2) injecting proper ethanol to the coalbed segment of the coal reservoir near-wellbore area; (3) selecting soaking period and times according to coal rank difference of the coalbed segment, and then discharging the ethanol; (4) testing effect, namely comparing daily gas production and operating cost of the coalbed methane well before and after operation. According to the method, near-wellbore organic pollution and coal dust blocking are removed, coal is extracted, porosity and permeability of the coal reservoir are increased, a crack system of the coal reservoir is allowed to communicate with the wellbore, a blocking problem of the coalbed methane near-wellbore area is solved, economical investment is low, and gas production of the coalbed methane well can be increased.

The invention discloses a system of increasing yield of coal seam gas by mixing with a hot air proppant. The system comprises a high temperature and high pressure hot air generating device, a proppantstorage tank, a proppant delivery pump and a multi-stage mixing device, wherein the air outlet end of the high temperature and high pressure hot air generating device is connected to the air inlet end of the multi-stage mixing device, the discharge end of the proppant storage tank is connected to the feed end of the proppant delivery pump, the discharge end of the proppant delivery pump is connected to the feed end of the multi-stage mixing device, and the mixture discharge end of the multi-stage mixing device is connected to the upper end of a coal seam well opened in a low-coal rank reservoir. The system provided by the invention mixes the hot air with high temperature and high pressure and proppant uniformly three times and then injects the mixture into the coal seam well in the low-coal rank reservoir to heat the coal seam to generate a large number of artificial cracks, which can increase the resolution rate of coal seam gas. At the same time, the filling of the proppant into cracks can prevent the cracks from being closed due to stress release and increase the production of coal seam gas.

The invention relates to a iron ore low-temperature reduction-normal-temperature slag-iron separation-electric furnace steel making process. The process is characterized in that in a reduction processof a pellet ore or a lump iron ore in a rotary kiln, a low-coal-rank coal is sprayed into a middle rear section of the rotary kiln through compressed air, the coal is pyrolyzed into tar, pyrolysis gas and residual carbon in a rapid heating process of a high-temperature section, the pyrolysis gas is utilized as a reducing agent of a to-be-reduced material, the tar is used as a fuel for the rotarykiln, the pellet ore or the lump iron ore are subjected to selective reduction of iron in the pellet ore or lump iron ore, the reduced material and a residual carbon mixture are subjected to dry magnetic separation, the obtained residual carbon is returned and distributed to a kiln material for cyclic utilization, the obtained metalized materials are subjected to dry grinding, dry magnetic separation, iron powder briquetting and electric furnace smelting, so that pure steel can be obtained. According to the process, the tar, the pyrolysis coal gas and the residual carbon in the low-coal-rank coal are utilized to the maximum extent, only iron is reduced in the selective reduction process without reducing other elements, and a foundation is laid for preparing pure steel.

The invention relates to a method for automatically and rapidly partitioning coal rank types by utilizing a logging information computer. The method comprises the steps of: firstly, selecting different coal rank types of sensitive logging parameters; then constructing four combined logging parameters of an apparent wave impedance, a compensation neutron increment coefficient and an electrical resistivity difference index by sufficiently utilizing interval transit time, a compensation density, a compensation neutron and an electrical resistivity; then establishing a three-dimensional coal rank type identification plate; then establishing a coal rank type discriminatory equation; and finally, identifying the coal rank types. According to the method disclosed by the invention, based on logging information of coal rocks, such as natural gamma, a natural potential, the electrical resistivity, the interval transit time, the compensation density, the compensation neutron and the like and on the basis of analyzing different coal rank types of sensitive logging parameters, the combined logging parameters of the coal rocks, such as the apparent wave impedance, the compensation neutron increment coefficient, the electrical resistivity difference index and the like, are established, and by the combined logging parameters, the three-dimensional coal rank type identification plate is constructed, and the plate is programmed so as to partition the coal rank types and provide drilling logging technical support for safety mining of a coal mine and development of a coal bed gas.

The invention discloses a rotational flow coal powder combustor having multi-coal rank adaptability. The combustor mainly consists of a central wind pipe, a secondary wind pipe, a tertiary wind pipe, a secondary wind rotational flow blade, a central wind pipe flaring, a primary wind pipe flaring, a secondary wind pipe flaring, and the like. According to the rotational flow coal powder combustor disclosed by the invention, the reasonable design of the flaring of the combustor is matched with the reasonable design of wind distribution pipelines, and staged combustion is formed, so that a large and stable central reflowing region is formed at an outlet of the combustor, and more coal powder can be gathered at the borders of the reflowing region; besides, the coal powder of which the particle diameters are high can rotate and reflow at the outlet of the combustor, so that the staying time of the large-particle-diameter coal powder in a high-temperature region at the outlet of the combustor is prolonged, and the purposes that the coal powder is on fire in time and is stably combusted are guaranteed; the designed rotational flow coal powder combustor disclosed by the invention is simple in structure and convenient to reform; through adjusting air distribution, all kinds of bituminous coal and anthracite coal can be efficiently fueled; and the designed rotational flow coal powder combustor disclosed by the invention is suitable for combusting mixed coal, and can be widely applied to various kinds of coal powder fueled by an industrial boiler, and the multi-coal rank adaptability of the industrial boiler is improved.

The invention discloses a device and method for gas-liquid fluidization exploitation of old goaf slime water. The device comprises a superheated steam device, a slime water gasification-liquidation converting device, a gasification-liquidation product collecting device and a control device. The control device comprises a temperature control device, a pressure control device, a pressure and temperature coordinating device and a computer. The superheated steam device is composed of a water tank, a water supply pipeline, a heater and a steam pipeline. The slime water gasification-liquidation converting device comprises a slime water gasification-liquidation converting box. The gasification-liquidation product collecting device comprises an oil collecting device and a mixed gas collecting device. The temperature control device is located inside the heater. The pressure control device is located in the slime water gasification-liquidation converting box. The temperature and pressure coordinating device comprises a gas pump. The computer is connected with the slime water gasification-liquidation converting box and the heater. With the old goaf slime water as the research object, the device and method achieve a slime water gas-liquid fluidization exploitation experiment under the conditions of a given temperature, a given pressure and a given coal grade.

The invention discloses a coal sample crack penetration testing device. The coal sample crack penetration testing device comprises a circular fixed plate, a lower positioning mounting assembly and anupper positioning mounting assembly; the lower positioning mounting assembly is fixedly connected with the upper positioning mounting assembly; a coal sample column is arranged between the lower positioning mounting assembly and the upper positioning mounting assembly; the lower positioning mounting assembly is mounted on the upper surface of the circular fixed plate; the upper side of the upper positioning mounting assembly is fixedly provided with a first annular fixed plate; a plurality of lifting assemblies are arranged between the circular fixed plate and the first annular fixed plate ina circular array mode; each lifting assembly is provided with a penetrating mechanism and a crack observation mechanism; a plurality of heating resistance rods are arranged between the lower positioning mounting assembly and the upper positioning mounting assembly in a circular array mode; and a rotary adjusting mechanism is mounted on the first annular fixed plate. The coal sample crack penetration testing device is scientific in design and reasonable in structure, can be used for economically and effectively exploring crack change rules of coal reservoirs of different coal ranks at differenttemperatures, and provides a visual and quantitative research method for coal reservoir reform.

The invention discloses a method for establishing a metallurgical coke pore feature parameter prediction model. The method is characterized by comprising the steps of: 1) performing thermo-gravimetric analysis test on a single coal of more than 15 different coal ranks and a matching coal thereof to obtain a maximum volatile de-volatilization rate DTGmax (%/ min) of each sample; 2) performing Gieseler fluidity test on a coking coal to obtain a maximum Gieseler fluidity MF (graduation/ min) of each sample; 3) performing coking test on the coking coal samples, and obtaining the average pore size, porosity, proportion of pores smaller than 30 microns and proportion of pores greater than 150 microns of coke via an image analysis method; and 4) performing binary linear regression on the average pore size, porosity, proportion of pores smaller than 30 microns and proportion of pores greater than 150 microns of the coke respectively by using DTGmax and LgMF as independent variables to obtain a relation between the pore structure parameters and the DTGmax and LgMF. The prediction method is simple and convenient in test and high in prediction accuracy.

A method for the removal of mercury from a stream of flue gas obtained from the combustion of at least one coal type having an ASTM D388 coal rank of <3 includes the steps of introducing a kaolin or metakaolin-containing sorbent into the stream of flue gas and contacting the mercury with the kaolin or metakaolin-containing sorbent at a point where both the kaolin or metakaolin-containing sorbent and active free silica are present in the stream. The temperature of the flue gas is at least 900° C. The active free silica content of the flue gas resulting from the combustion of the coal is supplemented by the introduction of added active free silica such that the weight percentage of the total amount of active free silica relative to the weight of kaolin or metakaolin is at least 10%, the weight of any kaolin being expressed as the weight of metakaolin.

The invention discloses a method for quantitatively evaluating the migration rate of elements in coal in a high-temperature simulation process, and is suitable for the field of coal geology and geochemistry. The method comprises the following steps: taking low-rank coal with rich elements and high element content, carrying out simulation experiments on the low-rank coal under different temperature conditions by virtue of a high-temperature simulation experiment system, respectively carrying out main element and trace element content tests on coal samples before and after simulation, calculating the migration rate of each element, and establishing a correlation model of the element migration rate along with temperature change; and element migration is predicted. According to the method, the evolution process of the coal is reduced through the high-temperature simulation experiment, migration of the elements in the coal-grade evolution process can be quantitatively evaluated, the steps are simple and clear, the evaluation result is reliable, and the scheme can be used for guiding exploration of key strategic elements and treatment of harmful elements in coal and has good application prospects. And the method has important theoretical and practical significance on research on migration and enrichment rules of elements in coal.

The invention provides a device for measuring the pore pressure conduction rate of a medium-high coal rank coal core matrix. The device comprises a helium gas cylinder, a methane gas cylinder, an annular pressure container and a high-pressure experiment bin, the helium gas cylinder and the methane gas cylinder are connected with one end of a volume reference cylinder, an analysis tank or a pistoncontainer, the other ends of the volume reference cylinder, the analysis tank and the piston container are connected with a booster pump, one end of the annular pressure container is connected with the helium cylinder, the methane cylinder and the input end of the high-pressure experiment bin, the other end of the annular pressure container is connected with the output end of the high-pressure experiment bin, the helium cylinder and the methane cylinder are connected with the input port of the high-pressure experiment bin, the output port of the high-pressure experiment bin is connected with the input port of a volume correction container, and the output port of the volume correction container is connected with the volume reference cylinder, the analysis tank and the piston container; andthe high-pressure experiment bin comprises sealing end covers at the two ends and a high-pressure experiment bin chamber arranged between the sealing end covers, a sleeve is arranged in the high-pressure experiment bin chamber, and a rock core is arranged in the sleeve. The conduction rate measuring device provided by the invention provides a theoretical basis for formulating a medium-high coal-rank coal bed gas scheme.