31results about How to "Reduce smoke temperature deviation" patented technology

The invention belongs to a method for the on-line monitoring and alarming of a convection heating face flue gas temperature field of a power station boiler, which comprises the steps of calculating the average value of temperatures of furnace inner walls on inlet and outlet planes according to monitoring values of the temperatures of the furnace inner walls; additionally arranging flue gas temperature monitoring points at two sides; amending a flue gas average temperature; calculating the flue gas temperature of each point in the inlet and outlet planes of the heating faces, and the flue gas temperature of various planes vertical to the inlet and outlet planes of the heating faces; automatically generating a planar dynamic flue gas temperature colorful distribution diagram; and displaying in real time and providing site conditions and timely adjusting work conditions. The method disclosed by the invention realizes the accurate data monitoring and corresponding and visual diagram distribution display of flue gas temperature fields in the inlet and outlet planes and various longitudinal and horizontal planes vertical to the inlet and outlet planes of each convection heating face of superheater and reheater pipeline systems, provides direct data support for adjusting the burning work condition of the operation site of the power station boiler, and realizes the safe and economic operation of the convection heating faces of the superheater and reheater pipeline systems of the power station boiler.

A low-Nox combustion technology features that the combustion box is divided into primary combustion region, reduction region and burning off region from bottom to top. In the primary combustion region, the multi-layer horizontal coal powder combustion technique is used. In the reduction region the under-oxygen reduction technique is used. The burn0off air is fed into the burning off region. The jet direction of the secondary wind among each two burner layers is deflected clockwise by 10-15 deg. relative to the jet direction of primary wind and coal powder stream. The excessive coefficient of air in reduction region is 1.0. The horizontal direction of burn-off windjet is deflected anticlockwise by 5-10 deg. relative to the jet direction of primary wind. Its advantages are stable and uniform combustion, and low release of Nox.

The invention provides hexagonal or octagonal tangential arrangement of anthracite burning single-fireball direct-flow combustors, which is characterized in that: two groups of combustors are arranged on each water-cooling wall or two groups of combustors are arranged on two opposite water-cooling walls of a hearth respectively and a group of combustors are arranged on the other two opposite water-cooling walls respectively, each group of combustors are at least divided into a small group; and each small group of combustors are vertically provided with at least two primary air pulverized nozzles and three secondary air pulverized nozzles at intervals. Each coal mill is connected with eight or six primary air pulverized nozzles which have the same level with that of the coal mill. The start and stop of each coal mill affect the running of the eight or six primary air pulverized nozzles which are on the same layer. The hexagonal or octagonal tangential arrangement of the anthracite burning single-fireball direct-flow combustors can decrease the number of the air pulverized nozzles in a single group of combustors on the premise of meeting the requirements of the thermal power of a single air pulverized nozzle and the number of the total air pulverized nozzles, allows the thermal load qHr of a wall in a combustor area to be relatively high, and guarantees the timely ignition of an pulverized anthracite flow and low-load combustion of a boiler without oil.

The invention discloses an air staged-combustion vertical and horizontal combined arrangement type over fire air system for a tangential boiler. The air staged-combustion vertical and horizontal combined arrangement type over fire air system for the tangential boiler comprises a hearth, a hot air box, a pulverized coal pipeline, a primary air nozzle, a secondary air nozzle, a compact over fire air nozzle, a corner separation over fire air nozzle, a wall type separation over fire air nozzle and the like. According to the system, the tangential boiler is innovated in the conventional hearth height direction on the aspect of the way that over fire air is arranged at the corner, and the purposes of decreasing the excess air coefficient of a main combustion area and reducing NOx generation are realized by arranging corner separation over fire air nozzle and the wall type separation over fire air nozzle which are controlled independently on the upper portion of the main combustion area. By the adoption of the air staged-combustion vertical and horizontal combined arrangement type over fire air system, a sufficient over fire air rate, a reasonable reduction area length, good later-stage intra-boiler mixing and sufficient burn-out time can be guaranteed, smoke remaining rotation and temperature deviation can be effectively eliminated, the requirement for restraining NOx generation and the requirement for promoting pulverized coal to be burnt out are both considered, and the requirements for achieving safety operation of the boiler and being economical and environmentally friendly are met.

The invention relates to an efficient low-pollution W-shaped flame boiler OFA (over fire air) device and method. Conventional large-capacity W-shaped flame boiler OFA equipment occupies large space and is complex in structure. The OFA device comprises main combustion zone OFA nozzles, wing wall OFA nozzles, an upper hearth, an annular air duct and an air box provided with OFA layers, and is characterized in that one end of each main combustion zone OFA nozzle is fixed on the water-cooled wall, close to the throat position, of the upper hearth, and the other end of each main combustion zone OFA nozzle is fixed on the air box; one end of each wing wall OFA nozzle is connected onto the annular air duct through a pipeline, and the other end of each wing wall OFA nozzle is connected onto the water-cooled wall, close to the side wall position, of the upper hearth; and each OFA nozzle comprises a center air duct, an outer annular air duct and a cyclone, and the center air ducts are located in the outer annular air ducts. The OFA method is characterized in that OFA is fed to the OFA nozzles, and the OFA volume accounts for 19%-25% of total volume of air entering the boiler. The efficient low-pollution W-shaped flame boiler OFA device is simple in structure and can guarantee full mixing of OFA and main stream smoke.

The invention relates to a method for adjusting deviation of two sides of the reheating steam temperature of a four-corner tangential firing boiler by SOFA air doors. The method for adjusting the deviation of the two sides of the reheating steam temperature of the four-corner tangential firing boiler by the SOFA air doors comprises the steps that horizontal pendulum angles of the SOFA air doors are adjusted; when the deviation of two sides of the reheating steam temperature is removed, vertical pendulum angles of the SOFA air doors are no longer adjusted; when the deviation of two sides of thereheating steam temperature is not removed, the vertical pendulum angles of the SOFA air doors are adjusted; and when the vertical pendulum angles of the SOFA air doors are adjusted, firstly, the vertical pendulum angles of a second SOFA air door and a third SOFA air door are adjusted obliquely upwards, and then, the vertical pendulum angles of a first SOFA air door and a fourth SOFA air door areadjusted to horizontal positions. The adjustment of the reheating steam temperature and temperature-decreased water flow is realized through the cooperative cooperation of the horizontal pendulum angles and the vertical pendulum angles of the SOFA air door, through the nonsynchronous adjustment of the horizontal pendulum angles and the vertical pendulum angles, the deviation of two sides of smoketemperature of the four-corner tangential firing boiler is rapidly reduced, the high-temperature point of the reheater pipe wall is reduced, the problems of large deviation of a reheater outlet stream temperature and the unbalanced temperature-decreased water flow on two sides are solved, finally, the average stream temperature of the reheater outlet is improved, and the temperature-decreased water flow of the reheater is reduced.

The invention provides hexagonal or octagonal tangential arrangement of fuel-oil or fuel-gas single-fireball direct-flow combustors, which is characterized in that: six or eight groups of combustors are arranged in a hearth; each group of combustors are vertically provided with at least two oil guns or gas guns at intervals, two fuel blast nozzles and three secondary blast nozzles; the fuel oil or the fuel gas at a fuel oil or fuel gas operation station outlet in front of the furnace is connected with at least two layers of oil guns or gas guns arranged on four walls of a boiler through fuel oil or fuel gas pipelines; and each layer of oil guns or gas guns consist of six or eight oil guns or gas guns which are in the same level but not in the same group. The hexagonal or octagonal tangential arrangement of the fuel-oil or fuel-gas single-fireball direct-flow combustors can ensure that the distance between the uppermost and undermost two oil guns or gas guns and the thermal load of the walls of the combustor area are controlled in ideal ranges, the total height of the boiler is decreased and the manufacturing cost of the boiler is greatly reduced. Because air supplying conditions on two sides of a jet flow are good, flames of the oil guns or gas guns are not easy to attach to the walls and the safety of the work of a water-cooling wall is improved.

The invention discloses a final-stage reheater temperature adjusting device and an operation method thereof. The final-stage reheater temperature adjusting device comprises a controller, a rotating motor, a driving wheel, a driven wheel, a hydraulic cylinder, a hydraulic cylinder piston rod, a smoke shielding baffle and a power box used for providing electric energy, wherein the smoke shielding baffle is located between a high-temperature superheater in a boiler horizontal flue and a final-stage reheater, an output shaft of the rotating motor is connected with the driving wheel, the driving wheel is matched with the driven wheel, the and driven wheel is connected with the upper end of the smoke shielding baffle; one end of the hydraulic cylinder piston rod is matched with the hydraulic cylinder, and the other end of the hydraulic cylinder piston rod is inserted into the boiler horizontal flue and then connected with the smoke shielding baffle; and the controller is connected with the control end of a piston cylinder and the control end of the rotating motor. According to the device and the operation method of the device, the phenomenon of contamination and slagging of the heating surface of the final-stage reheater in the long-term high-load operation state of the boiler can be effectively relieved, and the operation safety and reliability of a unit are improved.

The invention provides a nozzle structure for overfired air of a boiler combustor. Combustion of a boiler can be subjected to fine adjustment, so that coal powder in the boiler can be combusted fully, and simultaneously low NOx emission can be realized, so that smoke temperature deviation at the outlet of a hearth is reduced. The nozzle structure comprises a pipeline, wherein swing blades are arranged in the outlet region of the pipeline. The nozzle structure is characterized in that the swing blades are classified into a longitudinal swing blade component and a transverse swing blade component which are positioned in different planar regions; and the longitudinal swing blade component is connected with a longitudinal swing pull rod; and the transverse swing blade component is connected with a transverse swing pull rod.

The invention relates to a boiler over-fire air adjusting method based on momentum moment. According to the technical scheme, the method comprises steps as follows: burner momentum moment in oppositerotating directions in a main burning zone is summated to obtain reverse tangent wind momentum moment; burner momentum moment in the same rotating direction in the main burning zone is summated to obtain tangent wind momentum moment; a ratio of the sum of the reverse tangent wind momentum moment to the sum of the tangent wind momentum moment is obtained, and a reverse tangent angle of over-fire air is adjusted through an over-fire air adjusting mechanism until the ratio is in a range of 0.8-1.2. According to the method, a thermal state adjusting effect is realized by a cold state test, workingprocess and workload are simplified, and working efficiency is greatly increased; by adjustment for the boiler over-fire air, a rotary cutting effect of the over-fire air is improved, residual rotation of a boiler is eliminated, flue gas in a horizontal flue of the boiler is uniformly distributed, finally, dust is accumulated in the horizontal flue uniformly, besides, the falling dust has no influence on boiler disturbance, negative pressure avoids fluctuating sharply, flue gas temperature difference and steam temperature difference of the horizontal flue are reduced, and safe operation of the boiler is improved.

The invention discloses an asymmetric furnace arch structure capable of reducing boiler flue gas temperature difference, and relates to a structure of tangent arrangement of a combustor hearth, in particular to the asymmetric furnace arch structure capable of reducing the boiler flue gas temperature difference. The structure comprises two furnace arches which are arranged at the connecting position of a horizontal flue and a hearth main combustion area, and the two furnace arches are arranged on a hearth front wall and a hearth rear wall, and the two furnace arches are arranged on the hearth front wall and the hearth rear wall in an asymmetric manner. The structure is simple, when the main combustion area airflow rotates anticlockwises, the furnace arch, close to the left side, of the hearth front wall can guide the flow direction of the flue gas on the left side to the horizontal flue as far as possible, the deviation degree of the flue gas to the hearth front wall is greatly weakened, the guide effect on the flue gas on the right side is not changed, flue gas flow rates of the left side and the right side of a hearth outlet are finally consistent, and are consistent with the heatexchange amount of the heating face, and the flue gas temperature difference is greatly reduced.