Boiler dosing device with multi-stage dosing function

Abstract

The utility model relates to a boiler dosing device with a multi-stage dosing function, which is arranged on a steam drum tank and a coal economizer of a boiler system. The primary dosing assembly is arranged on the economizer and comprises a front-end dosing pipe, and an outlet end pipe of the front-end dosing pipe is connected to an economizer water inlet pipe of the economizer; the secondary dosing assembly is arranged on the steam drum tank and comprises a main dosing pipe, the main dosing pipe is arranged outside the top of the steam drum tank, two connecting pipes are connected to the outlet end of the main dosing pipe in parallel, the outlet ends of the connecting pipes are arranged in the top of the steam drum tank, and a plurality of dosing branch pipes are connected to the outlet end of the steam drum tank; the water return assembly is arranged at the bottom of the steam drum tank and comprises a plurality of groups of water return pipes, each group of water return pipes comprises a water return vertical pipe arranged on the outer wall of the steam drum tank, the bottom ends of the water return vertical pipes are connected into the tank bottom of the steam drum tank, and the top ends of the water return vertical pipes are connected into the middle of the steam drum tank; and a pump body is arranged on the outer wall of the bottom of each water return vertical pipe.

Description

TECHNICAL FIELD

[0001] The utility model relates to a boiler system technical field, concretely is a multistage dosing's boiler dosing device. BACKGROUND

[0002] In the boiler system, in order to improve the quality of boiler water and prevent the inside scale, corrosion etc. of boiler, usually need to add various medicaments to boiler water, such as scale inhibitor, corrosion inhibitor etc., the uniform mixing of these medicaments is crucial to its effect; However, the existing boiler dosing device has some deficiencies in medicament mixing;Traditional boiler dosing usually is in the feedwater system (such as before economizer) or steam pocket of boiler and carries out one-time dosing, this dosing mode has some problems;

[0003] Firstly, due to the fast water flow speed in the feedwater system or steam pocket, medicament can not be fully dissolved and uniformly mixed, resulting in the effect of medicament greatly discounted, secondly, even if the medicament can be dissolved, but due to lack of sufficient disturbance or mixing device, the distribution of medicament in boiler water can also be uneven, the concentration of medicament in some areas is too high, and the concentration in some areas is insufficient, which can not achieve the expected scale and corrosion prevention effect, for large boiler system, due to its complex structure and long water flow path, it is difficult to realize the uniform distribution of medicament in the whole boiler system by simply relying on one-time dosing, although the prior art has made some improvements, such as increasing stirring device, changing dosing position etc., but these improvements still have certain limitations, and can not meet the high requirements of large boiler system for uniform mixing of medicament;

[0004] Therefore, it is necessary to develop a new type of boiler dosing device to solve the deficiencies in the prior art and improve the mixing effect and utilization rate of medicament. INVENTION CONTENTS

[0005] The utility model solves the technical problem in the prior art, provides a multistage dosing's boiler dosing device, which is provided with a multistage dosing structure between the economizer and the steam pocket, and a fluid flow speed increasing structure in the steam pocket, so that the mixing effect of the medicament is improved.

[0006] The technical problem solved by the utility model is solved by the following technical scheme, a multistage dosing's boiler dosing device is arranged on the steam pocket tank and the economizer of the boiler system, the top of the steam pocket tank is provided with a saturated steam outlet, the bottom of the steam pocket tank is provided with an uptake inlet, a downcomer outlet and a water inlet connected with the water outlet of the economizer, and the boiler dosing device comprises;

[0007] A first dosing assembly is arranged on the economizer, the first dosing assembly comprises a front-end dosing pipe, and the outlet end of the front-end dosing pipe is connected to the economizer water inlet pipe of the economizer;

[0008] The secondary dosing assembly arranged on the steam pocket tank comprises a total dosing pipe arranged outside the top of the steam pocket tank, two connecting pipes connected in parallel on the outlet end of the total dosing pipe, and a plurality of dosing branch pipes connected on the outlet end of the connecting pipes.

[0009] The water returning assembly arranged at the bottom of the steam pocket tank comprises a plurality of groups of water returning pipes, each group of the water returning pipes comprising a water returning vertical pipe arranged on the outer wall of the steam pocket tank, the bottom end of the water returning vertical pipe being connected to the bottom of the steam pocket tank, the top end of the water returning vertical pipe being connected to the middle of the steam pocket tank, and a pump body being arranged on the outer wall of the bottom of each water returning vertical pipe.

[0010] The technical problem to be solved by the utility model can also be solved by the following technical scheme, the multi-stage dosing boiler dosing device, each dosing branch pipe being provided with a group of water returning pipes.

[0011] The technical problem to be solved by the utility model can also be solved by the following technical scheme, the multi-stage dosing boiler dosing device, the dosing branch pipe being provided with five dosing branch pipes, and the outlet end heights of the five dosing branch pipes being distributed from low to high or from high to low.

[0012] The technical problem to be solved by the utility model can also be solved by the following technical scheme, the multi-stage dosing boiler dosing device, the water returning pipe being vertically arranged.

[0013] Compared with the prior art, the utility model has the beneficial technical effects that:

[0014] (1) by adding the multi-stage dosing structure between the economizer and the steam pocket, the medicament can be gradually added at different positions and different stages, the problem of too high or too low local concentration caused by concentrated addition of the medicament is avoided, and the uniform distribution of the medicament in the whole boiler water is ensured;

[0015] (2) the water returning assembly for increasing the fluid flow rate is arranged in the steam pocket, the full mixing of the boiler water and the medicament is effectively promoted, each group of water returning pipes is directly above a dosing branch pipe, the medicament added into the steam pocket can be fully mixed with the fluid, the waste of the medicament is reduced, the service life of the boiler is prolonged, and the maintenance cost is reduced. DRAWINGS

[0016] Figure 1 It is a front view structural schematic diagram of the utility model.

[0017] 1, steam drum; 2, economizer; 3, riser inlet; 4, downcomer outlet; 5, water inlet; 6, front end dosing pipe; 7, total dosing pipe; 8, connecting pipe; 9, dosing branch pipe; 10, reverse water vertical pipe; 11, pump body. DETAILED DESCRIPTION

[0018] The specific technical scheme of the utility model is further described below with reference to the drawings, so that those skilled in the art can further understand the utility model without limiting the rights thereof.

[0019] Embodiment 1, refer to Figure 1 A multi-stage dosing boiler dosing device is arranged on a steam drum 1 and an economizer 2 of a boiler system, the top of the steam drum 1 is provided with a saturated steam outlet, the bottom of the steam drum 1 is provided with a riser inlet 3, a downcomer outlet 4 and a water inlet 5 connected with the water outlet of the economizer 2, and the boiler dosing device comprises;

[0020] A first-stage dosing assembly arranged on the economizer 2, the first-stage dosing assembly comprises a front end dosing pipe 6, an external dosing pump can dose the front end dosing pipe 6, and the outlet end of the front end dosing pipe 6 is connected to the water inlet pipe of the economizer 2;

[0021] When first dosing is performed, the front end dosing pipe 6 of the first-stage dosing assembly can be used for dosing, at this time, the medicament can enter the economizer 2 together with water for preheating, compared with directly entering the steam drum, the travel of the medicament can be increased, so that the dissolving effect of the medicament is better;

[0022] A second-stage dosing assembly arranged on the steam drum 1, the second-stage dosing assembly comprises a total dosing pipe 7 arranged outside the top of the steam drum 1, two connecting pipes 8 are connected in parallel at the outlet end of the total dosing pipe 7, the outlet end of the connecting pipe 8 is arranged inside the top of the steam drum 1, and a plurality of dosing branch pipes 9 are connected at the outlet end of the steam drum 1, the number of the dosing branch pipes 9 is 5, the outlet end heights of the 5 dosing branch pipes 9 are distributed from low to high or from high to low, and the user can select as required;

[0023] When second dosing, i.e., small amount dosing, is performed, the second-stage dosing assembly can be used for dosing, at this time, the medicament can directly enter the steam drum 1 through the total dosing pipe 7, the connecting pipe 8 and the dosing branch pipe 9, so that the second dosing is realized, since the second dosing is not the first dosing, the dosing amount is low, and a long travel is not required to meet the requirement that the medicament is fully mixed;

[0024] The reverse water assembly is arranged at the bottom of the steam drum 1, and includes a plurality of groups of reverse water pipes. Each of the dosing branch pipes 9 is provided with a group of the reverse water pipes. The reverse water pipes are vertically arranged. Each of the groups of the reverse water pipes includes a reverse water vertical pipe 10 arranged on the outer wall of the steam drum 1. The bottom end of the reverse water vertical pipe 10 is connected to the bottom of the steam drum 1, and the top end of the reverse water vertical pipe 10 is connected to the middle of the steam drum 1. A pump body 11 is arranged on the outer wall of the bottom of each of the reverse water vertical pipes 10. The pump body 11 pumps the fluid at the bottom of the steam drum 1 to the middle of the steam drum 1, so as to form a jet flow, and the medicament is mixed uniformly to a certain extent.

[0025] When the multi-stage dosing boiler dosing device in the embodiment 1 is used, when the first dosing is performed, the medicament is pumped to the front dosing pipe 6 of the first dosing assembly by the external dosing pump of the boiler system, so as to be added to the economizer 2. In the economizer 2, the medicament is preheated together with the water, which is helpful for the dissolution of the medicament. After the first dosing, whether the medicament needs to be added again can be determined according to the operation of the boiler system and the consumption of the medicament. When it is determined that the medicament needs to be added again, the medicament is added through the total dosing pipe 7 of the second dosing assembly. At this time, the medicament is divided into two parallel connection pipes 8 through the total dosing pipe 7, and finally enters the steam drum 1 through the five dosing branch pipes 9. Since the amount of the medicament added again is small, the medicament can directly enter the steam drum through the dosing branch pipe 9 and be mixed with the boiler water in the steam drum.

[0026] During the dosing, the reverse water assembly can be used to promote the mixing of the medicament and the water. The pump body 11 pumps the fluid at the bottom of the steam drum 1 to the middle, so as to form a jet flow. The jet flow is helpful for the more sufficient mixing of the newly added medicament and the boiler water.

Claims

1. A multi-stage dosing device for a boiler, which is provided on a drum and an economizer of a boiler system, the drum having a saturated steam outlet at a top portion thereof, and the drum having an uptake inlet at a bottom portion thereof, a downcomer outlet, and a water inlet connected to a water outlet of the economizer, characterized in that: The boiler dosing device comprises; A first-stage dosing assembly disposed on the economizer, the first-stage dosing assembly comprising a front-end dosing pipe, an outlet end of the front-end dosing pipe being connected to an economizer water inlet pipe of the economizer; A second-stage dosing assembly disposed on the steam drum, the second-stage dosing assembly comprising a total dosing pipe disposed outside a top portion of the steam drum, two connecting pipes being connected in parallel to an outlet end of the total dosing pipe, outlet ends of the connecting pipes being disposed inside the top portion of the steam drum, and a plurality of dosing branch pipes being connected to an outlet end of the steam drum; A backwater assembly disposed at a bottom portion of the steam drum, the backwater assembly comprising a plurality of groups of backwater pipes, each group of backwater pipes comprising a backwater vertical pipe disposed on an outer wall of the steam drum, a bottom end of the backwater vertical pipe being connected to a bottom portion of the steam drum, and a top end of the backwater vertical pipe being connected to a middle portion of the steam drum, and a pump body being disposed on an outer wall of a bottom portion of each backwater vertical pipe.

2. A multi-stage dosing boiler dosing device according to claim 1, characterized in that Each dosing branch pipe is provided below with a group of backwater pipes.

3. A multi-stage dosing boiler dosing device according to claim 1, characterized in that: The dosing branch pipes are provided in five, and outlet ends of the five dosing branch pipes are distributed in a low-to-high or high-to-low manner.

4. A multi-stage dosing boiler dosing device according to claim 1, characterized in that: The backwater pipes are vertically disposed.

Images