CN220229113U - Novel forced recirculation structure of forced circulation waste heat boiler vertical economizer - Google Patents

Abstract

The utility model discloses a novel forced recycling structure of a vertical economizer of a forced circulation waste heat boiler, which comprises a boiler barrel and a vertical economizer, wherein an economizer inlet header and an economizer outlet header are respectively arranged at two ends of the vertical economizer, a descending pipe is arranged at the lower end of the boiler barrel, a forced circulation pump is arranged at one end of the descending pipe far away from the boiler barrel, the output end of the forced circulation pump is connected with a circulation pipe and an introduction pipe, an electric control valve group is arranged on the circulation pipe, the output end of the circulation pipe is connected with the economizer inlet header, the outlet of the economizer outlet header is connected with the boiler barrel through a first pipeline, a convection evaporator is connected on the introduction pipe, and the outlet of the convection evaporator is connected with the boiler barrel through an eduction pipe. Compared with the prior art, the utility model has the advantages that: the utility model provides a can form the operation flow similar to evaporation convection bank, need not increase additional cost and running cost, and the piping connection is short, very big reduction the input cost of recycling.

Description

Novel forced recirculation structure of forced circulation waste heat boiler vertical economizer

Technical Field

The utility model relates to the technical field of boilers, in particular to a novel forced recycling structure of a vertical economizer of a forced circulation waste heat boiler.

Background

The prior boiler economizer circulating structure generally comprises a deaerator, a water feeding pump isolation door, an economizer and a boiler barrel which are sequentially connected through pipelines, wherein the top of the boiler barrel is provided with a boiler barrel steam eduction tube, the bottom of the boiler barrel is communicated with the water inlet end of the economizer through an economizer recycling pipeline, and an economizer recycling valve is arranged on the economizer recycling pipeline, so that closed cycle of an economizer system is realized; the second circulating structure of the boiler economizer comprises a desalting water tank, a deaerator, a water feeding pump isolation door, an economizer and a boiler barrel which are sequentially connected through pipelines, wherein the top of the boiler barrel is provided with a boiler barrel steam eduction tube, and the desalting water tank is communicated with the water outlet end of the economizer through a recycling pipeline of the economizer.

The first boiler economizer circulating structure in the prior art is characterized in that a natural circulating recirculating structure communicated with the water inlet end of the economizer through an economizer recirculating pipeline at the bottom of a boiler barrel cannot guarantee safe operation of a waste heat boiler during ignition and furnace lifting, and a second medium demineralized water tank-deaerator-water supply pump-economizer-demineralized water tank circulating structure is adopted, an electric switching valve group is required to be added at the position from the outlet of the economizer to a connecting pipe of the boiler barrel, so that additional cost is increased, and a water supply pump is required to be started during operation, so that operation cost and operation difficulty of owners are increased. The development of new structures is thus pursued.

Disclosure of Invention

The technical problem to be solved by the utility model is to overcome the technical defects and provide a novel forced recycling structure of the vertical economizer of the forced circulation waste heat boiler.

In order to solve the technical problems, the technical scheme provided by the utility model is as follows: the utility model provides a novel forced recirculation structure of vertical economizer of forced circulation exhaust-heat boiler, including drum and vertical economizer, the both ends of vertical economizer are equipped with economizer import collection case and economizer outlet header respectively, the lower extreme of drum is equipped with the downcomer, the one end that the drum was kept away from to the downcomer is equipped with forced circulation pump, forced circulation pump's output is connected with circulating pipe and inlet tube, be equipped with electric control valves and the output of circulating pipe on the circulating pipe is connected with economizer import collection case, the export of economizer outlet header is connected with the drum through first pipeline, be connected with the convection evaporator on the inlet tube, the export of convection evaporator is connected with the drum through the outlet tube.

As an improvement, a water supply bypass is connected to the water supply pipe of the inlet header of the economizer, the output end of the water supply bypass is connected with a first pipeline, one end of the first pipeline, which is close to the outlet header of the economizer, is provided with a second pipeline connected with an eduction pipe, and a communication valve group is arranged on the second pipeline.

As an improvement, the inlet pipe is also provided with other heating surfaces, and the output ends of the other heating surfaces are connected with the outlet pipe.

As an improvement, a cutoff valve group is arranged on the first pipeline.

Compared with the prior art, the utility model has the advantages that: the novel forced recirculation structure of the forced circulation waste heat boiler vertical economizer utilizes the forced circulation system of the waste heat boiler body, the inlet header of the economizer is communicated with the outlet pipeline of the forced circulation water pump of the forced circulation system, and the communicated recirculation pipeline is also provided with the electric control valve group.

Drawings

Fig. 1 is a schematic structural view of an embodiment 1 of a novel forced recirculation structure of a vertical economizer for a forced circulation waste heat boiler.

Fig. 2 is a schematic structural diagram of an embodiment 2 of a novel forced recirculation structure of a vertical economizer for a forced circulation waste heat boiler.

As shown in the figure: 1. the boiler comprises a boiler barrel, 2, a vertical economizer, 3, an economizer inlet header, 4, an economizer outlet header, 5, a down pipe, 6, a forced circulation pump, 7, a circulation pipe, 8, an inlet pipe, 9, a first pipeline, 10, a convection evaporator, 11, an outlet pipe, 12, a water supply bypass, 13, a second pipeline, 14, a communication valve bank, 15, other heating surfaces, 16 and a cut-off valve bank.

Detailed Description

Specific embodiments of the present utility model will be further described below with reference to the accompanying drawings. Wherein like parts are designated by like reference numerals.

In order to make the contents of the present utility model more clearly understood, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model.

Example 1

Referring to fig. 1, a novel forced recirculation structure of a forced circulation waste heat boiler vertical economizer comprises a boiler barrel 1 and a vertical economizer 2, wherein an economizer inlet header 3 and an economizer outlet header 4 are respectively arranged at two ends of the vertical economizer 2, a descending pipe 5 is arranged at the lower end of the boiler barrel 1, a forced circulation pump 6 is arranged at one end, far away from the boiler barrel 1, of the descending pipe 5, the output end of the forced circulation pump 6 is connected with a circulation pipe 7 and an inlet pipe 8, an electric control valve group is arranged on the circulation pipe 7, the output end of the circulation pipe 7 is connected with the economizer inlet header 3, the outlet of the economizer outlet header 4 is connected with the boiler barrel 1 through a first pipeline 9, a convection evaporator 10 is connected on the inlet pipe 8, and the outlet of the convection evaporator 10 is connected with the boiler barrel 1 through an outlet pipe 11.

In one embodiment, the inlet pipe 8 is further provided with other heating surfaces 15, and the output ends of the other heating surfaces 15 are connected with the outlet pipe 11.

In one embodiment, the first line 9 is provided with a shut-off valve group 16.

Working principle: after entering the boiler, the working medium is heated and evaporated from the water supply until the superheated steam with rated parameters is sent out from the boiler, and the working medium is subjected to three different heating states: (1) heating of water. From the feed water temperature, the flue gas is heated to a saturation temperature at the corresponding pressure, and the heating device is named as an economizer. (2) evaporation of water. The water with saturation temperature is heated to steam with saturation temperature, the temperature of working medium is kept unchanged, the dryness of the steam is heated from X=0 to X=1, and the heating equipment is named as an evaporator. (3) superheating of steam. The saturated steam is heated to superheated steam with rated parameters, and the heating equipment is named as a superheater. The circulating system of the forced circulation boiler is that a down pipe of the boiler is led out from the bottom of the boiler barrel, led to an inlet of a boiler water circulating pump, and water pumped out from the boiler water circulating pump enters each heating surface to be heated respectively, and the heated steam-water mixture is collected to a total steam water pipe of the boiler from each heating surface and is led back to the boiler barrel.

Example 2

Referring to fig. 2, a novel forced recirculation structure of a forced circulation waste heat boiler vertical economizer comprises a boiler barrel 1 and a vertical economizer 2, wherein an economizer inlet header 3 and an economizer outlet header 4 are respectively arranged at two ends of the vertical economizer 2, a descending pipe 5 is arranged at the lower end of the boiler barrel 1, a forced circulation pump 6 is arranged at one end, far away from the boiler barrel 1, of the descending pipe 5, the output end of the forced circulation pump 6 is connected with a circulation pipe 7 and an inlet pipe 8, an electric control valve group is arranged on the circulation pipe 7, the output end of the circulation pipe 7 is connected with the economizer inlet header 3, the outlet of the economizer outlet header 4 is connected with the boiler barrel 1 through a first pipeline 9, a convection evaporator 10 is connected on the inlet pipe 8, and the outlet of the convection evaporator 10 is connected with the boiler barrel 1 through an outlet pipe 11.

In one embodiment, a water supply bypass 12 is connected to the water supply pipe of the economizer inlet header 3, the output end of the water supply bypass 12 is connected to the first pipeline 9, one end of the first pipeline 9, which is close to the economizer outlet header 4, is provided with a second pipeline 13 connected to the outlet pipe 11, and the second pipeline 13 is provided with a communication valve group 14.

In one embodiment, the inlet pipe 8 is further provided with other heating surfaces 15, and the output ends of the other heating surfaces 15 are connected with the outlet pipe 11.

In one embodiment, the first line 9 is provided with a shut-off valve group 16.

Working principle: the embodiment is based on an improved structure of the economizer recirculation pipeline, and the economizer is switched to be used as an evaporator under the condition that the condition of waste heat flue gas is deteriorated, so that the low-temperature corrosion condition of the pipe wall is reduced, and the service life of the waste heat boiler is prolonged. The economizer is a vertical economizer, is positioned behind an evaporation convection tube bundle, opens a water supply bypass valve according to fig. 2, and opens a valve bank on a circulating tube and a second pipeline and closes a cut-off valve bank. The economizer is used as an evaporator after the valve group is switched.

The utility model and its embodiments have been described above with no limitation, and the actual construction is not limited to the embodiments of the utility model as shown in the drawings. In summary, if one of ordinary skill in the art is informed by this disclosure, a structural manner and an embodiment similar to the technical solution should not be creatively devised without departing from the gist of the present utility model.

Claims (4)

1. The utility model provides a novel forced recirculation structure of vertical economizer of forced circulation exhaust-heat boiler, includes drum (1) and vertical economizer (2), the both ends of vertical economizer (2) are equipped with economizer inlet header (3) and economizer outlet header (4) respectively, a serial communication port, the lower extreme of drum (1) is equipped with drop tube (5), drop tube (5) are kept away from the one end of drum (1) is equipped with forced circulation pump (6), the output of forced circulation pump (6) is connected with circulating pipe (7) and inlet tube (8), be equipped with electric control valves and the output and the economizer inlet header (3) of circulating pipe (7) on circulating pipe (7), the export of economizer outlet header (4) is connected with drum (1) through first pipeline (9), be connected with convection evaporator (10) on inlet tube (8), the export of convection evaporator (10) is connected with drum (1) through outlet pipe (11).

2. The novel forced recycling structure of the vertical economizer of the forced circulation waste heat boiler according to claim 1, wherein a water supply bypass (12) is connected to a water supply pipe of an economizer inlet header (3), an output end of the water supply bypass (12) is connected with the first pipeline (9), a second pipeline (13) connected with an eduction pipe (11) is arranged at one end, close to the economizer outlet header (4), of the first pipeline (9), and a communicating valve group (14) is arranged on the second pipeline (13).

3. The novel forced recirculation structure of the vertical economizer of the forced circulation waste heat boiler according to claim 2, wherein other heating surfaces (15) are further arranged on the inlet pipe (8), and the output ends of the other heating surfaces (15) are connected with the outlet pipe (11).

4. The novel forced recirculation structure of the vertical economizer of the forced circulation waste heat boiler according to claim 1, wherein the first pipeline (9) is provided with a cut-off valve group (16).