Medium pressure burners for boiler no. 18. Vertical water tube boilers

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Loads over 5 kg:

• Delivery in Moscow
• Delivery cost in Moscow is 500 rubles. Delivery times and times are agreed upon when ordering.
• Delivery of large-sized cargo (for example, KCHM boilers) in the Moscow region: delivery to the region is 500 rubles + 30 rubles for each kilometer from the Moscow Ring Road. The cost of delivery depends on the order amount and can be free regardless of the distance.
• Delivery throughout Kaluga and the region
• Delivery within Kaluga is free.
• Delivery to the region is free for the following settlements: Kirov, Baryatino, Mosalsk, Obninsk, Maloyaroslavets. Delivery to other settlements is coordinated with the managers of the Kaluga branch of the company.
• Delivery to regions of Russia
• Delivery to the regions is carried out by road transport companies and our own vehicles. Shipment to any trucking company in Moscow is FREE!
• Delivery is carried out, if possible, to your city. If it is impossible to deliver to a certain city, delivery is carried out to the nearest possible. You can also indicate a specialized transport company that has a representative office in Moscow and carries out cargo transportation to your city - delivery of equipment in Moscow to your transport company will be free.

Load less than 5 kg:
Delivery in Moscow and regions of the Russian Federation

Delivery is carried out by the SDEK courier service according to the “hand to hand” scheme from Monday to Friday from 10-00 to 18-00. By separate agreement with the operator, delivery can be made at other times, as well as on weekends. Delivery is carried out during the day, or at your request in the first (from 11-00 to 14-00) or second (from 14-00 to 18-00) half of the day. Also, for your convenience, we can offer evening delivery (negotiated with the operator personally).

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30-60 minutes before your visit, the courier will contact you and inform you of the exact time of arrival. Our couriers do not go to the customer’s address without a preliminary call to the customer.

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Payment for ordered equipment

Payment for the ordered equipment is made in any way convenient for you:

• For courier delivery (Moscow and Moscow region, Kaluga and Kaluga region) - cash/non-cash payment
• Delivery to the regions via trucking companies - cashless payments

• - vertical arrangement of pipes of small diameter (with this arrangement, there is much less deposits in the pipes than with horizontal ones).
• - water-tube screening of the combustion chamber reduces the specific material consumption compared to horizontal water-tube boilers.

Vertical water tube boilers are heating class boilers. These include:

• - steel sectional boilers of types “NR” (Fig. 3.33), “NIISTU”, “ZIO”, etc.;
• - steel monoblock boilers of the “KVA” (Fig. 3.34), “KV-G”, “TVG” types, etc.

Sectional boilers are assembled locally. Monoblock units are supplied assembled and ready for use. Technical characteristics of vertical water tube hot water boilers are given in table. 3.15-3.18.

1 – hatch cover for cleaning; 2 – partition made of refractory brick; 3 – pipe section; 4 – gas duct.

Steel sectional boilers operate under vacuum due to the natural draft created by the chimney.

Steel sectional boilers are designed to heat water to a temperature not higher than 115 0C. Sections of the HP-18 boiler are welded from three pipes D 89 mm (vertically installed pipes, Fig. 3.33) and one pipe D 108 mm (manifold), into which vertical pipes are welded at the top and bottom. The inner row of pipes is separated from the other two rows by a vertical partition made of refractory bricks, forming the radiation (side screens) and convective parts of the boiler. From the firebox, high-temperature combustion products flow through the opening into the convective part of the boiler. Going down the convective part, the combustion products enter the flue - 4. From the flue, the cooled combustion products go into the chimney. Steel sectional boilers operate on solid, liquid and gaseous fuels.

The efficiency of these boilers is in the range of 80-85%

Rice. 3.34. Vertical water tube boiler – KVA (monoblock)

1 – boiler body; 2 – embrasure; 3 – flue box; 4 – burner; 5 – pipe system.

Boilers of types “KVA”, “KV-G”, “TVG” operate under excess pressure. Excess pressure is created by air supplied by a blower fan and fuel entering the burner from the fuel distribution device. In the burner, fuel and air are mixed and the entire air-fuel tract operates under pressure. The fireboxes of these boilers are formed by the inner walls of the boiler tube system. The gas tightness of the combustion chambers is ensured by welded membranes installed in the gaps between the pipes. The pipe system is designed to heat water and organize the movement of combustion products in the interpipe space (flow around the heat transfer surface). The pipe system forms the radiation-screen and convective parts of the boiler. The pipe system consists of two annular collectors connected to each other by straight vertical pipes located along several concentric circles in a checkerboard pattern. The upper and lower collectors have stamped tube sheets to which pipes are welded. Ring collectors are usually covered with removable covers.

The disadvantages of monoblock boilers include high thermophysical and thermal stresses that arise in the inter-tube membranes. In order to maintain gas tightness, non-stop operation is preferable for boilers of this type.

In order to simplify and reduce the cost of manufacturing and installation of boilers, to make them better suited for burning low-grade fuels, and for heating water to temperatures exceeding 115 ° C, steel hot water boilers, in most cases made from pipes, were developed and introduced.

Such designs include once-through heating boilers made by Prof. L.K. Ramzin, steel boilers of the N.N. Revokatov system types NR-17 and NR-18 and the I.S. Bolotin system types B-1 and B-2. The group of steel boilers includes fire-tube boilers, which are gradually being replaced by more advanced boilers. structures, as well as old steam boilers adapted for operation as hot water boilers.

Direct-flow heating boilers by L.K. Ramzin (Fig. 50) are distinguished by their simplicity of design; The main material in their manufacture is pipes with a diameter of 38/32 mm, welded into manifolds made of pipes with a diameter of 83/76 mm. The heating surface of the boiler consists of a ceiling screen 1 and a convection package of coils 2. Water from the heating system enters the lower collector 3 of the convection package 2, passes through its coils, then passes into the collector and pipes of the ceiling screen, from which it is directed through pipe 4 to the heating system . Combustion products, leaving the combustion volume 5, wash the ceiling screen and pass into the lower gas duct 69 in which it is located

Convective package of coils, and go down the hog 7 and the chimney. The firebox can be of a semi-mechanical type. The operating pressure of the boiler is 5 ati.

As can be seen from table. 15, heating boilers by L.K. Ramzin are manufactured with a heating capacity of 170,000 and 300,000 kcal/hour.

Table 15

Technical characteristics of once-through heating boilers

L. K. Ramzina

For efficient and reliable operation, the boiler must be included in a forced water circulation system.

The steel sectional water heating boiler of the N.N. Revokatov system is produced in two types: NR-17 with a heating capacity from 120,000 to 240,000 kcal/hour and NR-18 with a heating capacity from 312,000 to 600,000 kcal/hour.

A steel boiler of type NR-17 in a single lining (Fig. 51) is assembled from sections; The second section is assembled from three vertical pipes 1 with a diameter of 89/82.5 mm, a length of 1450 mm, welded at the top and bottom into horizontal pipes 2 and 3 of the same diameter. In the upper part of the vertical pipe, located on the side of the firebox, a throttling rectangular strip is installed, directing circulating water to the upper protrusion of the section, which is the ceiling screen.

The horizontal pipes of the sections are welded into prefabricated manifolds 4 with a diameter of 108/100.5 mm. The boiler furnace 5 has a sufficient volume and can be adapted to burn any type of fuel. Two boilers can be interlocked in a common lining, located symmetrically relative to the middle wall of the firebox.

In terms of its size, the boiler may well be intended to replace Strel's failed cast-iron boilers.

A steel boiler of type NR-18 (Fig. 52) consists of two identical packages left 1 1G right 2, welded from three parts
tic pipes with a diameter of 89/82.5 mm, similar to the HP-17 boiler just described. The NR-18 boiler in question has two side walls and a firebox ceiling that are shielded. Flue gases leaving the furnace are divided into two streams and descend

There are 3 sections down along the vertical pipes, after which 4 boiler linings and 5 burs enter the smoke channels. The speed of the gases in the lower gas duct does not exceed 1-1.2 m/sec at normal boiler load.

Steel water-heating boilers by N.N. Revokatov can be adapted to operate as low-pressure steam boilers.

The disadvantage of the boiler design is the large weight of its welded package, reaching 800 kg, which complicates installation.

Main technical characteristics of steel boilers

N.N. Revokatova are presented in table. 16.

The steel boiler of the I. S. Bolotin system is produced in two types: B-1 with a heating surface of 17 m2 and

With a capacity of 290,000 kcal/hour B-2 with a heating surface of 38 m? and a heating capacity of 600,000 kcal/hour.

These boilers are characterized by a relatively high thermal voltage

The heating surface is equal to: -^- = 16-g-17 thousand.

Kcal/m2 hour, which is explained by the design features of the boiler.

A hot water boiler of type B-1 (Fig. 53) consists of three pipe sections 1, 2 by 3, which are assembled from vertical pipes with a diameter of 76/70 mm and a length of 1000 mm, welded at the top and bottom into two horizontal collectors of the same diameter. Of these sections, two (2 and 3) are located on the side walls of the firebox.

The boiler design includes an L-shaped combustion screen 4, made up of six pipes with a diameter of 76/70 mm, bent at an angle of 90°, welded to two horizontal collectors 5 and 6 of the same diameter. This screen covers the back wall and ceiling of the firebox. Thus, all the walls of the firebox, with the exception of the front one, are covered with radiation heating surfaces operating with high thermal tension.

Flue gases exit the furnace through a 500 mm wide window 7 in the front part of the left side wall, wash the convective section / boiler with a transverse flow, and then enter the prefabricated bur 8. The movement of gases in the furnace towards its front wall creates more favorable conditions for combustion wet fuel.

The boiler can be installed in a basement with a height of 3 m.

The type B-2 boiler differs from the one described by the presence of four pipe sections, two of which - radiation - are placed on the side walls of the furnace, and two - convective - in symmetrically located boiler flues. The height of the boiler pipes is 1300 mm. The boiler also has an L-shaped combustion screen. The diameter of the section pipes and screen is 89/82.5 mm.

The B-2 type boiler can be adapted to operate as a steam boiler; this requires additional installation of the drum and safety valves.

Technical characteristics of steel boilers of the I. S. Bolotin system are given in table. 17.

From the table 17 it can be seen that steel boilers of the I.S. Bolotin system are characterized by more favorable weight and volume indicators.

Return water from the heating system is introduced into the radiant or convective part of steel boilers. In the case when the return water is introduced into the convective zone, a large temperature difference between the flue gases and the heated water is created, and better heat transfer conditions are provided; the consequence of this is an increase in the efficiency of the boiler. However, in the case of burning wet fuels and low values

Rice. 53. Steel hot water boiler of the I. S. Bolotin system.

Flue gas temperatures in the end part of the boiler; the outer surfaces of the pipes located in this part may be subject to corrosion due to the deposition of moisture from the flue gases. In this regard, you should check the temperature of the walls of the boiler pipes at the place where the return water is introduced at the highest outside air temperatures of the heating season. If the temperature of the return water is below the dew point temperature, then measures should be taken to increase the temperature of the return water entering the boiler, for example, by mixing heated water to it, or by introducing return water into the radiant part of the boiler.