阅读说明：本技术 一种电锅炉与抽汽加热联合的工业供汽系统 (Industrial steam supply system combining electric boiler and steam extraction heating ) 是由 程东涛 雒青 万小艳 温婷 王春燕 余小兵 王东晔 郑天帅 于 2021-08-19 设计创作，主要内容包括：一种电锅炉与抽汽加热联合的工业供汽系统,包括煤粉锅炉、电锅炉和除氧器；除氧器出口分为两路,一路与电锅炉相连,电锅炉与汽汽换热器的第二入口相连,汽汽换热器的第一出口与第三高压加热器相连,第三高压加热器与第二高压加热器相连,第二高压加热器与第一高压加热器相连,第一高压加热器与煤粉锅炉的第一入口相连。通过将电锅炉与三段抽汽加热系统相结合,用电锅炉将热水加热至饱和状态,用三段抽汽高过热度蒸汽将饱和蒸汽加热至工业蒸汽需求温度,实现大流量且流量、压力、温度可调可控的工业蒸汽供给,既解决了原热力系统工业供汽流量受限的问题,又有效利用了机组三段抽汽高过热度,提高机组综合能源利用效率。(An industrial steam supply system combining an electric boiler and steam extraction heating comprises a pulverized coal boiler, the electric boiler and a deaerator; the outlet of the deaerator is divided into two paths, one path of the deaerator is connected with an electric boiler, the electric boiler is connected with a second inlet of the steam-steam heat exchanger, a first outlet of the steam-steam heat exchanger is connected with a third high-pressure heater, the third high-pressure heater is connected with a second high-pressure heater, the second high-pressure heater is connected with a first high-pressure heater, and the first high-pressure heater is connected with a first inlet of the pulverized coal boiler. The electric boiler is combined with the three-section steam extraction heating system, the electric boiler heats hot water to a saturated state, and the three-section steam extraction high-superheat steam heats saturated steam to the required temperature of industrial steam, so that large-flow industrial steam supply with adjustable and controllable flow, pressure and temperature is realized, the problem that the industrial steam supply flow of an original heat system is limited is solved, the three-section steam extraction high-superheat of the unit is effectively utilized, and the comprehensive energy utilization efficiency of the unit is improved.)

1. An industrial steam supply system combining an electric boiler and steam extraction heating is characterized by comprising a pulverized coal boiler (1), an electric boiler (10), a steam-steam heat exchanger (9), a third high-pressure heater (15), a second high-pressure heater (16), a first high-pressure heater (17) and a deaerator (12);

an outlet of the deaerator (12) is divided into two paths, one path is connected with the electric boiler (10), the electric boiler (10) is connected with a second inlet of the steam-steam heat exchanger (9), a first outlet of the steam-steam heat exchanger (9) is connected with a third high-pressure heater (15), the third high-pressure heater (15) is connected with a second high-pressure heater (16), the second high-pressure heater (16) is connected with a first high-pressure heater (17), and the first high-pressure heater (17) is connected with a first inlet of the pulverized coal boiler (1).

2. An industrial steam supply system combining an electric boiler and extraction heating according to claim 1, characterized in that one path is connected to the electric boiler (10) via a variable frequency booster pump (13).

3. An industrial steam supply system with combined electric boiler and steam extraction heating as claimed in claim 1, characterized in that the other path of the outlet of the deaerator (12) is connected with a third high-pressure heater (15) through a water pump set (14).

4. An industrial steam supply system with combined electric boiler and extraction heating according to claim 1, characterized in that the second outlet of the steam-steam heat exchanger (9) is connected to the industrial steam supply pipe (7) via an industrial steam supply regulating valve (8).

5. The industrial steam supply system combining the electric boiler and the steam extraction heating as claimed in claim 1, characterized in that the first outlet of the pulverized coal boiler (1) is connected to the high pressure cylinder (2), the outlet of the high pressure cylinder (2) is divided into three paths, one path is connected to the first high pressure heater (17), the other path is connected to the second high pressure heater (16), and the third path is connected to the second inlet of the pulverized coal boiler (1).

6. The industrial steam supply system combining the electric boiler and the steam extraction heating as claimed in claim 1, wherein the second outlet of the pulverized coal boiler (1) is connected to the intermediate pressure cylinder (3), the outlet of the intermediate pressure cylinder (3) is divided into three paths, one path is connected to the low pressure cylinder (4), the other path is connected to the third high pressure heater (15), and the third path is connected to the first inlet of the steam-steam heat exchanger (9).

7. An electric boiler and extraction heating combined industrial steam supply system according to claim 1, characterized in that the low pressure cylinder (4) is connected with a generator (5).

8. An industrial steam supply system with combined electric boiler and extraction heating according to claim 1, characterized in that the outlet of the intermediate pressure cylinder (3) is connected to the third high pressure heater (15) via a three-stage extraction regulating valve (18).

9. An industrial steam supply system with combined electric boiler and extraction heating according to claim 1, characterized in that the outlet of the intermediate pressure cylinder (3) is connected to the first inlet of the steam-steam heat exchanger (9) via a three-stage extraction steam-to-steam heat exchanger isolation valve (6).

Technical Field

The invention belongs to the field of industrial steam supply of thermal power plants, and particularly relates to an industrial steam supply system combining an electric boiler and steam extraction heating.

Background

The external supply of industrial steam in a thermal power plant becomes a main business except for power generation and heating supply, the traditional industrial steam supply mode mainly extracts steam from a corresponding steam extraction port of a thermodynamic system according to the industrial steam supply demand, however, the traditional industrial steam supply mode is influenced by the safety of a steam turbine set and the combustion stability of a boiler, the steam extraction amount is often greatly limited, and particularly, the problem that the steam extraction parameter of the original steam extraction port cannot meet the steam supply demand often occurs along with the reduction of the load of the set, so that the contradiction between steam supply and power generation is caused.

In recent years, the electric boiler technology is applied to the fields of heating and industrial steam supply, wherein the working pressure and the temperature required in the field of heating are relatively low, and the electric boiler is applied to the field of heating and has become mature. In the industrial steam supply field, because the working pressure and the temperature required by industrial steam supply are relatively high, the application of the electric boiler is required to be higher, two-stage heating is often required, the first stage heats hot water to a saturated state, and the second stage heats saturated water to an overheated state, wherein the technology of the first stage heating is mature, but the technical difficulty of the second stage heating is high, and the partial existing application also needs larger investment correspondingly, so that the popularization and the application of the industrial steam supply of the electric boiler are slower.

In the prior art, three-stage extraction steam has the phenomenon of high superheat degree (about 250 ℃), the problem that high-quality steam cannot be reasonably utilized due to the fact that three-stage extraction steam is used for directly heating third-stage extraction steam, and in order to reasonably utilize the high superheat degree of the three-stage extraction steam, an external steam cooler is arranged for heating boiler feed water, and the problems of complex system and high investment are caused.

Disclosure of Invention

The invention aims to provide an industrial steam supply system combining an electric boiler and steam extraction heating.

In order to achieve the purpose, the invention adopts the technical scheme that:

an industrial steam supply system combining an electric boiler and steam extraction heating comprises a pulverized coal boiler, the electric boiler, a steam-steam heat exchanger, a third high-pressure heater, a second high-pressure heater, a first high-pressure heater and a deaerator;

the outlet of the deaerator is divided into two paths, one path of the deaerator is connected with an electric boiler, the electric boiler is connected with a second inlet of the steam-steam heat exchanger, a first outlet of the steam-steam heat exchanger is connected with a third high-pressure heater, the third high-pressure heater is connected with a second high-pressure heater, the second high-pressure heater is connected with a first high-pressure heater, and the first high-pressure heater is connected with a first inlet of the pulverized coal boiler.

The invention has the further improvement that one path is connected with the electric boiler through the variable-frequency booster pump.

The invention is further improved in that the first outlet of the deaerator is connected with the third high-pressure heater through the water pump set.

The invention is further improved in that the second outlet of the steam-steam heat exchanger is connected with the industrial steam supply pipeline through an industrial steam supply regulating valve.

The invention has the further improvement that the first outlet of the pulverized coal boiler is connected with the high-pressure cylinder, the outlet of the high-pressure cylinder is divided into three paths, one path is connected with the first high-pressure heater, the other path is connected with the second high-pressure heater, and the third path is connected with the second inlet of the pulverized coal boiler.

The invention has the further improvement that a second outlet of the pulverized coal boiler is connected with an intermediate pressure cylinder, the outlet of the intermediate pressure cylinder is divided into three paths, one path is connected with a low pressure cylinder, the other path is connected with a third high pressure heater, and the third path is connected with a first inlet of a steam-steam heat exchanger;

the invention is further improved in that a generator is connected to the low-pressure cylinder.

The invention is further improved in that the outlet of the intermediate pressure cylinder is connected with the third high pressure heater through a three-section steam extraction regulating valve.

The invention is further improved in that the outlet of the intermediate pressure cylinder is connected with the first inlet of the steam-steam heat exchanger through a three-section steam extraction-to-steam heat exchanger isolation valve.

Compared with the prior art, the invention has the following beneficial effects: according to the invention, the electric boiler is connected with the second inlet of the steam-steam heat exchanger, the first outlet of the steam-steam heat exchanger is connected with the third high-pressure heater, the third high-pressure heater is connected with the second high-pressure heater, the second high-pressure heater is connected with the first high-pressure heater, and the electric boiler is combined with three-section steam extraction heating, so that stable large-flow industrial steam can be obtained, and compared with the traditional external steam extraction steam supply, the steam turbine set safety or boiler combustion stability problem caused by large steam extraction amount at a steam extraction port is avoided; compared with the technology of directly supplying industrial steam to an electric boiler, the method effectively solves the problems of high technical difficulty and large investment of the electric boiler for heating superheated steam; the three-section extraction steam and the saturated steam at the outlet of the electric boiler are subjected to heat exchange and then continuously enter the third high-pressure heater, so that the industrial steam supply requirement is met, the high superheat degree of the three-section extraction steam is reasonably utilized, and the comprehensive energy utilization efficiency of the unit is improved. The invention has simple structure, easy realization and low cost.

Drawings

FIG. 1 is a schematic diagram of the overall system of the present invention.

In the figure, 1, a pulverized coal boiler; 2. a high pressure cylinder; 3. an intermediate pressure cylinder; 4. a low pressure cylinder; 5. a generator; 6. three-stage steam extraction to steam-steam heat exchanger isolation valves; 7. an industrial steam supply pipeline; 8. industrial steam supply regulating valves; 9. a steam-steam heat exchanger; 10. an electric boiler; 11. a steam-steam heat exchanger to a three-section steam extraction isolation valve; 12. a deaerator; 13. a variable frequency booster pump; 14. a water feed pump set; 15. a third high pressure heater; 16. a second high pressure heater; 17. a first high pressure heater; 18. a three-stage steam extraction regulating valve; 19. and (4) three-stage steam extraction.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings.

To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

In addition, an element of the present invention may be said to be "fixed" or "disposed" to another element, either directly on the other element or with intervening elements present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.

Referring to fig. 1, the invention comprises a pulverized coal boiler 1 and a three-stage steam extraction heating system, wherein the pulverized coal boiler 1 comprises a first inlet, a first outlet, a second inlet and a second outlet, the first outlet of the pulverized coal boiler 1 is connected with a high-pressure cylinder 2, the outlet of the high-pressure cylinder 12 is divided into three paths, one path is connected with a first high-pressure heater 17, the other path is connected with a second high-pressure heater 16, the third path is connected with the first inlet of the pulverized coal boiler 1, the second outlet of the pulverized coal boiler 1 is connected with an intermediate pressure cylinder 3, the outlet of the intermediate pressure cylinder 3 is divided into three paths, one path is connected with a low-pressure cylinder 4, and the low-pressure cylinder 4 is connected with a generator 5; the other path is connected with a third high-pressure heater 15 through a three-section steam extraction regulating valve 18, and the third path is connected with a first inlet of a steam-steam heat exchanger 9 through a three-section steam extraction to a steam-steam heat exchanger isolating valve 6.

The outlet of the deaerator 12 is divided into two paths, one path is connected with the electric boiler 10 through the variable frequency booster pump 13, the electric boiler 10 is connected with the second inlet of the steam-steam heat exchanger 9, the other path is connected with the water feed pump group 14, the water feed pump group 14 is connected with the third high-pressure heater 15, the third high-pressure heater 15 is connected with the second high-pressure heater 16, the second high-pressure heater 16 is connected with the first high-pressure heater 17, and the first high-pressure heater 17 is connected with the second inlet of the pulverized coal boiler 1. A second outlet of the steam-steam heat exchanger 9 is connected with an industrial steam supply pipeline 7 through an industrial steam supply regulating valve 8.

A path of hot water is led out from a water outlet pipeline of a deaerator 12, the hot water is boosted by a variable frequency booster pump 13 and then flows to an electric boiler 10, the variable frequency booster pump 13 adjusts the pressure according to the requirement of industrial steam supply pressure, the electric boiler 10 heats the boosted hot water to a saturated state, saturated steam enters a steam-steam heat exchanger 9 and is heated by incoming steam of three-section steam extraction 19 and then is supplied to an industrial steam supply pipeline 7 after being heated to the requirement temperature of the industrial steam supply, the other side of the steam-steam heat exchanger 9 is cooled by the incoming steam heat exchange of the three-section steam extraction 19 and then continuously returns to the three-section steam extraction pipeline to a third high-pressure heater 15 for continuously releasing heat, wherein a three-section steam extraction regulating valve 18 can regulate and control the flow rate of the three-section steam extraction to the steam-steam heat exchanger 9 so as to control the heating temperature of the industrial steam, and an industrial steam supply regulating valve 8 can directly regulate the flow rate of the industrial steam supply, thereby realizing the regulation of the flow rate, the pressure and the temperature of the industrial steam supply, And (4) controllable.

The foregoing is merely illustrative of the preferred embodiments of the present invention and is not to be construed as limiting the claims. The present invention is not limited to the above embodiments, and the specific structure thereof is allowed to vary. But all changes which come within the scope of the invention are intended to be embraced therein.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.