CN116212628A - Installation construction method of urea hydrolysis ammonia production system for denitration of thermal power plant - Google Patents
Installation construction method of urea hydrolysis ammonia production system for denitration of thermal power plant Download PDFInfo
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- CN116212628A CN116212628A CN202211362240.7A CN202211362240A CN116212628A CN 116212628 A CN116212628 A CN 116212628A CN 202211362240 A CN202211362240 A CN 202211362240A CN 116212628 A CN116212628 A CN 116212628A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01C—AMMONIA; CYANOGEN; COMPOUNDS THEREOF
- C01C1/00—Ammonia; Compounds thereof
- C01C1/02—Preparation, purification or separation of ammonia
- C01C1/08—Preparation of ammonia from nitrogenous organic substances
- C01C1/086—Preparation of ammonia from nitrogenous organic substances from urea
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
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Abstract
The invention discloses a construction method for installing a urea hydrolysis ammonia production system for denitration of a thermal power plant, which comprises the steps of S1, checking the urea hydrolysis ammonia production system according to a drawing and an equipment list after the urea hydrolysis ammonia production system arrives at a commodity; s2, finishing a foundation for fixedly mounting each device in the ammonia production system by the urea hydrolysis method, and mounting and operating a pump and a fan; s3, lifting the hydrolyzer to the shifter through a crane, and then carrying the hydrolyzer to the foundation through the shifter; s4, aligning and installing the ammonia spraying grille through the bracket; s5, arranging two parallel flue gas heaters at the reducing position behind the SCR reactor; s6, cleaning the pipelines, and classifying and installing the pipelines according to different types of pipelines to complete the communication of all equipment in the ammonia production system by urea hydrolysis; in the process of reforming liquid ammonia into urea hydrolysis ammonia production in the thermal power plant, the invention provides construction guidance, and has simple construction operation and easy grasp so as to furthest reduce technical problems in construction.
Description
Technical field:
the invention relates to the field of power plant construction, in particular to a method for installing and constructing a urea hydrolysis ammonia production system for denitration of a thermal power plant.
The background technology is as follows:
denitration system of thermal power factory: the NOx (nitrogen oxides) in the flue gas is removed, and the harm to the atmosphere is reduced. Because the liquid ammonia is widely applied to thermal power plants, has corrosiveness and volatility, can be mixed with air to form explosive mixture, and is easy to cause physical and chemical explosion when encountering open fire. Ammonia belongs to toxic gas, and mild inhalation can cause diseases such as rhinitis, pharyngitis, tracheitis, bronchitis and the like, and severe inhalation can cause laryngeal edema, glottic stenosis and respiratory tract mucosa shedding, thereby causing tracheal obstruction and causing asphyxia to endanger life. So the prior art is improved to carry out denitration after urea pyrolysis.
Therefore, in a thermal power plant in which a denitration device adopts a Selective Catalytic Reduction (SCR) method and a reducing agent adopts liquid ammonia in denitration of a coal-fired unit, an engineering for converting liquid ammonia into urea to hydrolyze to prepare ammonia is required. In the project of reforming transform of liquid ammonia into urea, because its running equipment and pipeline circuit are all being under construction in comparatively narrow and small space such as original piping lane frame, newly-increased pipeline material, specification are more to product gas companion heat pipeline is carbon steel material, forbid with stainless steel product gas pipeline contact, and require heat transfer efficiency higher, the construction degree of difficulty is great.
The invention comprises the following steps:
in order to solve the technical problems, the invention provides the installation construction method of the urea hydrolysis ammonia production system for the denitration of the thermal power plant, which can provide construction guidance in the process of modifying the thermal power plant coal-fired unit by adopting the liquid ammonia as the reducing agent in the process of modifying the thermal power plant coal-fired unit by adopting the liquid ammonia by adopting the selective catalytic reduction method (SCR), can furthest reduce the technical problems in the construction of modifying the denitration liquid ammonia into the urea project, and has simple construction operation and easy grasp.
In order to solve the technical problems, the invention provides a technical scheme that: the installation construction method of the urea hydrolysis ammonia production system for the denitration of the thermal power plant comprises the following steps: firstly, counting according to a drawing and an equipment list after the urea hydrolysis ammonia production system arrives at a commodity;
step two, finishing a foundation for fixedly mounting each device in the urea hydrolysis ammonia production system, and mounting and operating a pump and a fan in a test mode;
step three, fixing the steel wire rope and the clamping ring on a lifting point on the hydrolyzer, lifting the hydrolyzer to a shifter through a crane, and then carrying the hydrolyzer to a foundation through the shifter to complete the installation of the hydrolyzer;
fourthly, aligning and installing the ammonia spraying grille through the bracket;
step five, arranging two parallel flue gas heaters at the reducing position behind the SCR reactor;
and step six, cleaning the pipelines, and classifying and installing the pipelines according to different types of pipelines to complete the communication of all equipment in the ammonia production system by urea hydrolysis.
Further, in the first step, the process of counting the urea hydrolysis ammonia production system is as follows: when the urea hydrolysis ammonia production system is unpacked and checked after goods arrive, the relevant personnel of the material departments, owners and equipment manufacturers arrive at the scene, the equipment quantity is carefully checked according to the drawing and equipment list, the equipment specification, the model and the quantity are checked, the conditions of equipment damage, missing parts and the like are recorded, vulnerable and fragile equipment such as meters, liquid level meters and the like are checked, and classification numbers are reasonably and orderly placed according to the installation sequence after the checking is finished, so that unnecessary transportation during equipment installation is prevented, and rainproof, waterproof and dampproof measures are properly kept.
Further, in the second step, the step of arranging the foundation is:
1) Cleaning the surface of the foundation, and defining the foundation center and elevation to finish foundation paying-off;
2) Checking the foundation bolt, cleaning antirust grease, and then placing the foundation bolt into a foundation hole to finish the installation of the foundation bolt;
3) Leveling and grouting the equipment by using a square level meter and checking the longitudinal and transverse level of the equipment at a preset position on the equipment.
4. The installation and construction method of the urea hydrolysis ammonia production system for the denitration of the thermal power plant, which is characterized by comprising the following steps of: in the second step, the steps of installing and operating the pump and the fan are as follows:
1) Checking and processing the foundation according to the related specification of checking and processing the foundation of the pump and the fan, and finishing checking before installation;
2) Classifying and installing equipment with a base and equipment without a base, and completing the installation of a pump and a fan after rough leveling, primary grouting and fine leveling operations;
3) Checking whether sundries exist in the pump and the fan, and enabling the rotor to be flexible to rotate, so that no blocking and abnormal sounds exist, and cleaning and checking the pump and the fan are completed;
4) After the operation is carried out for 1 to 3 minutes in the no-load state, whether the starting current and the operating current meet the standards or not is determined, and standard test is carried out after the no-load test reaches the standards.
Further, in the third step, the process of lifting the hydrolyzer is as follows:
1) Checking the hydrolyzer and determining whether the hydrolyzer meets the drawing requirements;
2) Selecting paired steel wire ropes and clamping rings meeting the load calculation requirements, and performing test hoisting by utilizing formal hoisting points on a hydrolyzer;
3) After the test hanging is confirmed to be safe, the cable rope is tied to control the rotation and swing of the hydrolyzer after the hydrolyzer is lifted, the hydrolyzer is rotated after the height exceeds the height of the obstacle, the hydrolyzer is adjusted to be above the position of the shifter, whether the mounting direction of the hydrolyzer is correct or not is checked, the hydrolyzer stops falling when the base of the hydrolyzer is about 10cm away from the shifter, and the hydrolyzer is fallen to the shifter after the center line of the hydrolyzer is confirmed to be aligned with the basic center line again.
Further, the process of shipping the hydrolyzer is as follows:
1) Confirming that the sleeper is padded with a solid foundation;
2) Adopting the channel steel of [16 ] as a rail for buckling and fixing, and sitting on a sleeper;
3) The shifter is welded with a baffle plate according to the requirement to prevent the baffle plate from sliding out of the track;
4) Confirming that the hydrolyzer is sitting on the shifter;
5) The pulley block is arranged, the steel wire rope is threaded in place, and the winch is started and stopped normally;
6) After starting a winch to pull in place, 4 jacks of 16 tons are used for jacking up the hydrolyzer and ensuring stability;
7) Drawing out the track and sleeper;
8) Simultaneously, the jack is lowered, and the hydrolyzer is adjusted to be in place;
9) Checking the equipment well and taking protective measures.
In the fourth step, heat tracing and heat preservation measures are taken for the mixed gas pipeline in the ammonia spraying grid to prevent the ammonium carbamate from corroding the pipeline after the temperature of the mixed gas is reduced.
In the sixth step, the pipeline comprises a factory pipeline connected with the existing equipment in the power plant, a product steam pipeline connected with the equipment in the ammonia production system by urea hydrolysis, and a heat tracing pipeline for heating.
The beneficial effects of the invention are as follows:
the application is applicable to the denitration device in the denitration of the coal-fired unit and adopts a Selective Catalytic Reduction (SCR), and the reducing agent adopts the thermal power plant of liquid ammonia, and in the process of preparing ammonia by hydrolysis of urea through liquid ammonia, under the condition of more newly-increased pipeline materials and specifications, construction guidance is provided in the construction of the original relatively narrow space such as a pipe rack, so that the technical problem in the construction of the urea project is changed from the denitration liquid ammonia to the maximum degree is reduced, the construction operation is simple, the operation is easy to master, and the denitration of the same type of unit is greatly referenced and guided.
The foregoing and other objects, features and advantages of the invention will be apparent from the following more particular description of preferred embodiments, as illustrated in the accompanying drawings.
The specific embodiment is as follows:
it should be understood that the steps recited in the method embodiments of the present invention may be performed in a different order. Furthermore, method embodiments may include additional steps omitting the execution of the illustrated steps. The scope of the invention is not limited in this respect.
The names of messages or information interacted between the devices in the embodiments of the present invention are for illustrative purposes only and are not intended to limit the scope of such messages or information.
Examples
The application discloses a thermal power factory denitration is with urea hydrolysis method ammonia system installation construction method, its step is:
s1, counting according to a drawing and an equipment list after the urea hydrolysis ammonia production system arrives at a commodity;
s2, finishing a foundation for fixedly mounting each device in the urea hydrolysis ammonia production system, and mounting and operating a pump and a fan in a test mode;
s3, fixing the steel wire rope and the clamping ring on a lifting point on the hydrolyzer, lifting the hydrolyzer to the shifter through a crane, and then carrying the hydrolyzer to a foundation through the shifter to complete the installation of the hydrolyzer;
s4, aligning and installing the ammonia spraying grille through the bracket;
s5, arranging two parallel flue gas heaters at the reducing position behind the SCR reactor;
and S6, cleaning the pipelines, and classifying and installing the pipelines according to different types of pipelines to complete the communication of all equipment in the ammonia production system by the urea hydrolysis method.
In step S1 of this embodiment, the process of counting the urea hydrolysis ammonia production system is as follows: when the urea hydrolysis ammonia production system is unpacked and checked after goods arrive, the relevant personnel of the material departments, owners and equipment manufacturers arrive at the scene, the equipment quantity is carefully checked according to the drawing and equipment list, the equipment specification, the model and the quantity are checked, the conditions of equipment damage, missing parts and the like are recorded, vulnerable and fragile equipment such as meters, liquid level meters and the like are checked, and classification numbers are reasonably and orderly placed according to the installation sequence after the checking is finished, so that unnecessary transportation during equipment installation is prevented, and rainproof, waterproof and dampproof measures are properly kept.
When the conditions of equipment damage, missing parts and the like occur, related departments such as materials are contacted in time to be processed and solved, and the small piece of equipment which is taken back should be properly classified and stored and marked, and used according to the figure and not be confused.
In step S2 of this embodiment, the step of arranging the foundation is:
1) And cleaning the surface of the foundation, and defining the foundation center and elevation to finish foundation paying-off.
(1) Cleaning the surface of a foundation, sweeping dust and concrete residues on the surface, positioning and measuring the foundation, and determining the center and elevation of the foundation;
(2) Measuring with theodolite or steel tape, paying out the longitudinal and transverse center line, marking the longitudinal and transverse center line on the basic surface with ink line;
(3) Measuring by using a level gauge, and drawing a horizontal datum line on the side surfaces of the foundation around the foundation;
(4) And discharging the center line of each part of the equipment and the center line of the ground bolt according to the longitudinal and transverse center line.
2) And (5) checking the foundation bolts, cleaning antirust grease, and then placing the foundation bolts into the foundation holes to finish the installation of the foundation bolts.
(1) The specification of the foundation bolt is required to meet the specification of a drawing;
(2) The bolt quality and length of the bolt meet the requirement of the specification, the bolt is well matched with the nut, and the head of the bolt meets the requirement of the drawing;
(3) The foundation bolts are cleaned with rust-proof grease before being placed in the foundation holes.
3) Leveling and grouting the equipment by using a square level meter and checking the longitudinal and transverse level of the equipment at a preset position on the equipment.
In step S2 of this embodiment, the steps of installing and commissioning the pump and the fan are as follows:
1) Checking and processing the foundation according to the related specification of checking and processing the foundation of the pump and the fan, and finishing checking before installation; the acceptance and processing of the device base is specified by the relevant specifications for the acceptance and processing of the device base. And checking the equipment and accessories, and checking the main installation size of the equipment, wherein the main installation size is in accordance with engineering design.
2) Classifying and installing equipment with a base and equipment without a base, and completing the installation of a pump and a fan after rough leveling, primary grouting and fine leveling operations;
(1) The whole equipment with the base is positioned, aligned, grouted once and leveled finely, and the whole equipment with the base is executed according to corresponding standards;
(2) The equipment without the base is provided with an equipment body, after the equipment body is initially leveled, a body initial leveling motor is used for primary grouting, the body is aligned at first in a precise time, and the motor is aligned according to the body;
(3) The base is horizontally used as an alignment reference surface by the split surface and the shaft extension part of the body;
(4) The tolerance of the device for the non-levelness of the longitudinal and transverse directions is 0.1/1000. The measuring is based on the processing surface;
(5) The coaxiality of the coupler, the parallelism and the axial offset tolerance of the pulley shaft accord with the specification of equipment technical files;
(6) The equipment is not smooth, the piping construction is not performed accurately, and additional stress cannot be applied to the pump body during piping.
3) Checking whether sundries exist in the pump and the fan, and enabling the rotor to be flexible to rotate, so that no blocking and abnormal sounds exist, and cleaning and checking the pump and the fan are completed;
(1) Before test, checking whether sundries exist in the equipment, and turning the rotor flexibly without stagnation and abnormal sound.
If the abnormality exists, the examination should be disassembled;
(2) The assembled and debugged parts of the equipment cannot be disassembled at will when leaving the factory, and the disassembly and the reinstallation are carried out according to the specification of the equipment file after the study and the determination of a field technical responsible person are carried out when the disassembly is needed;
(3) Sealing, cleaning and installing;
(4) The soft packing can not be pressed too tightly, and is adjusted when in operation, but the packing is needed to be added, and the mechanical seal is needed to be assembled again after being cleaned.
4) After the operation is carried out for 1 to 3 minutes in the no-load state, whether the starting current and the operating current meet the standards or not is determined, and standard test is carried out after the no-load test reaches the standards.
(1) Inspection content before the test: the driving device has been tested separately, and the steering of the driving device is consistent with the steering required by the equipment; checking the firmness of the connecting parts of the fasteners, and preventing loosening; the lubrication and cleaning are good, and the lubricating oil or grease is added according to the specification; whether the accessory equipment and the pipeline are washed clean. The pipeline should be kept smooth; whether the safety protection device is flexible and reliable; the jigger is flexible and the sound is normal.
(2) No load test run: after the operation is carried out for 1 to 3 minutes under the no-load state, whether the starting current and the operating current meet the requirements of equipment technical files or not is measured.
(3) Standard for no-load test run: no abnormal sound is generated during operation; each fastening part has no loosening phenomenon; the temperature rise of the bearing meets the requirements of equipment technical files.
(4) Load test: (1) the load test is participated by a construction unit dispatcher and a mounting unit dispatcher, and the load test is carried out after no load test is qualified;
(2) the equipment runs normally, and the pressure, flow, temperature and other requirements meet the specifications of equipment files;
(3) the operation is free from noise and leakage, and each fastening position is not loosened;
(4) the temperature of the rolling bearing is not higher than 80 ℃, and the temperature of the sliding bearing is not higher than 70 ℃;
(5) the temperature of the shaft seal packing is normal, the soft packing is suitable to have a small amount of leakage, the leakage is not larger than a designed specified value, such as random timing, the leakage quantity of the mechanical seal is not more than 5cm < 3 >/h (3 drops per 2 minutes) according to the specification of the current standard;
(6) the power of the prime mover or the current of the motor does not exceed a rated value;
(7) the safety protection device is flexible and reliable;
(7) the device amplitude meets the device file specification or specification standard.
(5) After the test run is finished, the following work is done: closing the outlet and inlet valves and the auxiliary system valves; discharging the accumulated liquid in the pump; and (5) taking protective measures for the pump which is stopped for a long time.
In step S3 of this embodiment, the process of lifting the hydrolyzer is:
1) Checking the hydrolyzer and determining whether the hydrolyzer meets the drawing requirements;
after the hydrolysis ammonia production module is transported to the site, the equipment is inspected, and hoisting is carried out after the inspection is finished and the requirements of the drawing are met. After entering the hoisting area, the crane is arranged according to the working radius, and a warning area and a warning line are arranged.
2) Selecting paired steel wire ropes and clamping rings meeting the load calculation requirements, and performing test hoisting by utilizing formal hoisting points on a hydrolyzer;
when in test hoisting, a pair of steel wire ropes and a special clamping ring which meet the requirement through load calculation are selected, and the main hoisting point on the equipment is utilized for hoisting, and the test hoisting is carried out before the hoisting and the hoisting is carried out strictly according to the operation specification of the crane.
3) After the test hanging is confirmed to be safe, the cable rope is tied to control the rotation and swing of the hydrolyzer after the hydrolyzer is lifted, the hydrolyzer is rotated after the height exceeds the height of the obstacle, the hydrolyzer is adjusted to be above the position of the shifter, whether the mounting direction of the hydrolyzer is correct or not is checked, the hydrolyzer stops falling when the base of the hydrolyzer is about 10cm away from the shifter, and the hydrolyzer is fallen to the shifter after the center line of the hydrolyzer is confirmed to be aligned with the basic center line again.
In step S3 of this embodiment, the process of shipping the hydrolyzer is:
the hydrolyzer can be transported to be in place by adopting a laying track, then 4 jacks with 16 tons are used for jacking the hydrolyzer, the track and the sleeper are pulled out to be in place, and the hydrolyzer is transported by adopting 4 shifters with 12 tons and 5 tons of windlass for traction and sliding to be in place.
Wherein, the consignment procedure is:
1) Confirming that the sleeper is padded with a solid foundation;
2) Adopting the channel steel of [16 ] as a rail for buckling and fixing, and sitting on a sleeper;
3) The shifter is welded with a baffle plate according to the requirement to prevent the baffle plate from sliding out of the track;
4) Confirming that the hydrolyzer is sitting on the shifter;
5) The pulley block is arranged, the steel wire rope is threaded in place, and the winch is started and stopped normally;
6) After starting a winch to pull in place, 4 jacks of 16 tons are used for jacking up the hydrolyzer and ensuring stability;
7) Drawing out the track and sleeper;
8) Simultaneously, the jack is lowered, and the hydrolyzer is adjusted to be in place;
9) Checking the equipment well and taking protective measures.
In step S4 of this embodiment, heat tracing and heat insulation measures are taken for the mixed gas pipeline in the ammonia injection grid to prevent the ammonia carbamate from corroding the pipeline after the temperature of the mixed gas is reduced.
Ensures that the ammonia gas and the flue gas are uniformly mixed. The injection system has good thermal expansion, thermal deformation resistance and vibration resistance, and can not be blocked by adopting good anti-blocking measures.
After the denitration reducing agent is changed from liquid ammonia to urea, the temperature of the mixed gas in the ammonia air mixer is increased to more than 140 ℃ from normal temperature, the volume flow is increased, the flow velocity of the ammonia air mixed gas sprayed by the original ammonia spraying grid pipeline and the nozzle can reach 1.7 times of the original flow velocity, the pipe diameter of the outlet of the existing ammonia air mixer and the ammonia spraying grid do not meet the use requirement, the mixing effect of the ammonia and the flow field of the flue gas is affected, and the ammonia spraying grid needs to be replaced completely. Meanwhile, heat tracing and heat preservation measures are adopted for the mixed gas pipeline to prevent ammonium carbamate from corroding the pipeline after the temperature of the mixed gas is reduced.
The general denitration transformation blowing-out time is shorter, a large amount of pairing work is needed to be completed before blowing out, the combined workload of the ammonia injection grids is larger, and alignment is difficult, and in order to better combine, the ammonia injection grids are positioned and supported by adopting a combined support, so that pairing errors and pairing time can be reduced, and the manual input quantity is reduced.
In step S5 of the present embodiment,
each unit of the power plant is generally provided with 2 dilution fans, 1 for 1.
After denitration is improved and urea is hydrolyzed, the reducing agent is prepared, and in order to prevent ammonia and air from generating reverse reaction in an ammonia-air mixer to regenerate urea, dilution air is heated to not lower than 180 ℃. The dilution wind can adopt a flue gas heating scheme, namely a flue gas heater is arranged at the reducing position behind the SCR reactor.
Each furnace is provided with 2 sets of flue gas heaters. After the dilution air is heated by the flue gas heater, the temperature of the dilution air is not lower than 180 ℃ under the rated dilution air quantity and any meteorological conditions. After the flue gas heater is added, the air quantity provided by the dilution fan is required to sufficiently dilute the ammonia gas, and the ammonia volume content in the ammonia/air mixture is less than 5%. The dilution fan can adapt to normal operation under the full load of the boiler, and a certain margin is reserved: the air volume margin is not lower than 10%, and the air pressure margin is not lower than 20%.
In step S6 of this embodiment, the pipes include a factory floor pipe connected to existing equipment in the power plant, a product steam pipe connected between individual equipment in the urea hydrolysis ammonia production system, and a heat tracing pipe for heating.
1) Factory floor pipe installation
Before the pipeline is installed, the interior of the pipeline must be treated cleanly, and no rust, slag, welding beads and other impurities should be present.
Because the construction is carried out on the original pipeline frame, the following conditions should be noted during pipeline storage:
(1) When the pipeline is registered, the pipeline is in a larger space, so that the original equipment pipeline is avoided;
(2) The position with smaller space when the pipeline is stored should avoid the original equipment pipeline, especially the original ammonia pipeline and the oil supply and return pipeline;
(3) When the pipeline registering space is smaller and the original ammonia pipeline and the oil supply and return pipeline cannot be avoided, the supervision and construction units are informed of checking the registering path, and operators are informed of the side station if necessary.
The specifications and materials of equipment, valves, pipes and tubes in each system should meet the specifications of the design drawing. The pipeline support and hanger should be installed strictly according to the design drawing, the on-site configuration should be machined, for example, the iron oxide should be removed by flame cutting, and the cutting part should be polished clean.
2) Product steam pipeline installation
The product steam pipeline is 316L, and the pipeline must be cleaned up before installation, and polishing, registering, butt joint, welding and other works can be performed. The stainless steel backing welding requires argon filling or uses an argon filling-free welding wire, the argon filling-free welding wire is high in price, and the argon filling amount of the whole pipe is too large and uneconomical, so that two sponges fixed on an iron wire penetrate into the pipe to form a local space for local argon filling, and an argon filling-free welding wire is adopted for individual dead ports, so that the argon consumption and the argon filling-free welding wire consumption are greatly reduced, and the material and the labor consumption are saved. And carrying out nondestructive testing after the pipeline is penetrated, and then carrying out hydrostatic testing.
3) Heat trace pipeline installation
The installation process of the heat tracing pipeline is strict, and the heat tracing pipeline is made of 20# steel and is not contacted with the product steam pipeline (316L). In the field construction process, the installation pipeline is longer, a steam double heat tracing process is adopted, and if the whole isolation of the thin stainless steel sheet is adopted, the cost is too high. And the welding wire head of the recycled stainless steel welding wire is adopted, and is stewed into a U-shaped bend which is clamped on the heat tracing pipe, and then the U-shaped bend is reinforced by the stainless steel wire. The method not only achieves the purposes of recycling waste materials and saving cost, but also greatly reduces the labor investment.
In this embodiment, the following operations are required in the installation process of the above-described apparatus:
1) Device positioning and leveling
(1) Hoisting the equipment to a foundation, and filling three groups of prepared sizing blocks and four groups of sizing blocks with elevation differences not exceeding 1mm;
(2) According to the central line on the foundation, prying the equipment by using a crowbar, aligning the longitudinal and transverse centers, and aligning the central line by using a plumb bob when the central position of the equipment is higher;
(3) Adjusting the height of the equipment by using a jack or a crow bar, leveling by using a sizing block leveling method which is a three-point leveling method, respectively putting a group of sizing blocks on two sides of one end of the equipment, centrally putting a group of sizing blocks on the other end, adjusting the sizing blocks on the two sides to level transversely, and centering a group of sizing blocks to level longitudinally;
(4) Preliminary leveling: using a square level meter, checking the longitudinal and transverse levels of the equipment at a position predetermined on the equipment, and fine-tuning by using inclined pad iron until the inclined pad iron meets the standard requirement;
principle of determining a device aspect level reference: a main shaft of the equipment, a main working surface, a reference surface during processing and other positions which are matched with the parts;
(5) Penetrating foundation bolts one by one, oiling the threads, screwing nut washers on the threads, and exposing the nuts 4-7 to be buckled by the threads;
(6) Filling other sizing block groups which are not contacted with the equipment base, and keeping a gap of 1-2 mm;
(7) And (5) rechecking the center position, elevation and horizontal and vertical levelness of the equipment, and finishing the preliminary leveling work after the equipment is qualified.
2) Secondary grouting
The secondary grouting of the foundation bolts is constructed by building constructors, foundation reserved holes are inspected and treated before grouting, sundries cannot exist in the holes, the distance between the foundation bolts and the hole walls is larger than 15mm, the distance between the foundation bolts and the hole bottoms is larger than 100mm, the hole walls are brushed with water to enable the foundation bolts to be clean and wet, oil stains cannot exist on the foundation bolt rods, manual tamping is performed during grouting, the periphery of the foundation bolts are uniformly tamped, the foundation bolts are righted at any time, the bolts are kept vertical after tamping and are positioned in the centers of the bolt holes, and the non-perpendicularity of the foundation bolts is not more than 10/1000.
3) Alignment of equipment
(1) The following conditions can be met before alignment, namely, the strength of the basic secondary grouting concrete reaches 75% of the design strength; the equipment sizing block is fully placed in position according to the standard; before the equipment with the equipment parts taken as a leveling foundation is leveled, the equipment parts are required to be disassembled, so that the rain protection and the dust prevention are ensured;
(2) Cleaning greasy dirt and dust on the leveled reference surface;
(3) Checking the position and elevation of the equipment;
(4) The anchor bolts are screwed and the sizing blocks are wedged simultaneously, longitudinal and transverse leveling is carried out, the levelness of the equipment is adjusted by the oblique sizing blocks until the anchor bolts are completely screwed, the sizing blocks are completely filled, the levelness of the equipment reaches standard regulation, and the finish leveling work is finished;
(5) At least one group of sizing blocks is arranged near each foundation bolt after equipment alignment; the sizing block is exposed out of the outer edge of the equipment base, the flat sizing block is exposed out of 10-30mm, the inclined sizing block is exposed out of 10-50mm, and the length of the sizing block group extending into the surface of the equipment base is more than the foundation bolt hole.
Meanwhile, quality control, safety measure and environmental protection measure are required to be made in the construction process, so that the construction process meets corresponding standards and specifications.
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (8)
1. The installation construction method of the urea hydrolysis ammonia production system for the denitration of the thermal power plant comprises the following steps:
firstly, counting according to a drawing and an equipment list after the urea hydrolysis ammonia production system arrives at a commodity;
step two, finishing a foundation for fixedly mounting each device in the urea hydrolysis ammonia production system, and mounting and operating a pump and a fan in a test mode;
step three, fixing the steel wire rope and the clamping ring on a lifting point on the hydrolyzer, lifting the hydrolyzer to a shifter through a crane, and then carrying the hydrolyzer to a foundation through the shifter to complete the installation of the hydrolyzer;
fourthly, aligning and installing the ammonia spraying grille through the bracket;
step five, arranging two parallel flue gas heaters at the reducing position behind the SCR reactor;
and step six, cleaning the pipelines, and classifying and installing the pipelines according to different types of pipelines to complete the communication of all equipment in the ammonia production system by urea hydrolysis.
2. The installation and construction method of the urea hydrolysis ammonia production system for the denitration of the thermal power plant, which is characterized by comprising the following steps of: in the first step, the process of counting the urea hydrolysis ammonia production system is as follows: when the urea hydrolysis ammonia production system is unpacked and checked after goods arrive, the relevant personnel of the material departments, owners and equipment manufacturers arrive at the scene, the equipment quantity is carefully checked according to the drawing and equipment list, the equipment specification, the model and the quantity are checked, the conditions of equipment damage, missing parts and the like are recorded, vulnerable and fragile equipment such as meters, liquid level meters and the like are checked, and classification numbers are reasonably and orderly placed according to the installation sequence after the checking is finished, so that unnecessary transportation during equipment installation is prevented, and rainproof, waterproof and dampproof measures are properly kept.
3. The installation and construction method of the urea hydrolysis ammonia production system for the denitration of the thermal power plant, which is characterized by comprising the following steps of: in the second step, the step of arranging the foundation is as follows:
1) Cleaning the surface of the foundation, and defining the foundation center and elevation to finish foundation paying-off;
2) Checking the foundation bolt, cleaning antirust grease, and then placing the foundation bolt into a foundation hole to finish the installation of the foundation bolt;
3) Leveling and grouting the equipment by using a square level meter and checking the longitudinal and transverse level of the equipment at a preset position on the equipment.
4. The installation and construction method of the urea hydrolysis ammonia production system for the denitration of the thermal power plant, which is characterized by comprising the following steps of: in the second step, the steps of installing and operating the pump and the fan are as follows:
1) Checking and processing the foundation according to the related specification of checking and processing the foundation of the pump and the fan, and finishing checking before installation;
2) Classifying and installing equipment with a base and equipment without a base, and completing the installation of a pump and a fan after rough leveling, primary grouting and fine leveling operations;
3) Checking whether sundries exist in the pump and the fan, and enabling the rotor to be flexible to rotate, so that no blocking and abnormal sounds exist, and cleaning and checking the pump and the fan are completed;
4) After the operation is carried out for 1 to 3 minutes in the no-load state, whether the starting current and the operating current meet the standards or not is determined, and standard test is carried out after the no-load test reaches the standards.
5. The installation and construction method of the urea hydrolysis ammonia production system for the denitration of the thermal power plant, which is characterized by comprising the following steps of: in the third step, the process of lifting the hydrolyzer is as follows:
1) Checking the hydrolyzer and determining whether the hydrolyzer meets the drawing requirements;
2) Selecting paired steel wire ropes and clamping rings meeting the load calculation requirements, and performing test hoisting by utilizing formal hoisting points on a hydrolyzer;
3) After the test hanging is confirmed to be safe, the cable rope is tied to control the rotation and swing of the hydrolyzer after the hydrolyzer is lifted, the hydrolyzer is rotated after the height exceeds the height of the obstacle, the hydrolyzer is adjusted to be above the position of the shifter, whether the mounting direction of the hydrolyzer is correct or not is checked, the hydrolyzer stops falling when the base of the hydrolyzer is about 10cm away from the shifter, and the hydrolyzer is fallen to the shifter after the center line of the hydrolyzer is confirmed to be aligned with the basic center line again.
6. The installation and construction method of the urea hydrolysis ammonia production system for the denitration of the thermal power plant, which is characterized by comprising the following steps of: in the third step, the process of shipping the hydrolyzer is as follows:
1) Confirming that the sleeper is padded with a solid foundation;
2) Adopting the channel steel of [16 ] as a rail for buckling and fixing, and sitting on a sleeper;
3) The shifter is welded with a baffle plate according to the requirement to prevent the baffle plate from sliding out of the track;
4) Confirming that the hydrolyzer is sitting on the shifter;
5) The pulley block is arranged, the steel wire rope is threaded in place, and the winch is started and stopped normally;
6) After starting a winch to pull in place, 4 jacks of 16 tons are used for jacking up the hydrolyzer and ensuring stability;
7) Drawing out the track and sleeper;
8) Simultaneously, the jack is lowered, and the hydrolyzer is adjusted to be in place;
9) Checking the equipment well and taking protective measures.
7. The installation and construction method of the urea hydrolysis ammonia production system for the denitration of the thermal power plant, which is characterized by comprising the following steps of: in the fourth step, heat tracing and heat preservation measures are adopted for the mixed gas pipeline in the ammonia injection grid, so that the ammonium carbamate is prevented from corroding the pipeline after the temperature of the mixed gas is reduced.
8. The installation and construction method of the urea hydrolysis ammonia production system for the denitration of the thermal power plant, which is characterized by comprising the following steps of: in the sixth step, the pipeline comprises a factory pipeline connected with the existing equipment in the power plant, a product steam pipeline connected with the equipment in the ammonia production system by urea hydrolysis and a heat tracing pipeline for heating.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211362240.7A CN116212628A (en) | 2022-11-02 | 2022-11-02 | Installation construction method of urea hydrolysis ammonia production system for denitration of thermal power plant |
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