* Says govt to inject 3.7 trn baht into economy

* Says exports to remain competitive, baht favourable

* Says tourism will recover gradually (Adds detail, quotes)

BANGKOK, Nov 15 (Reuters) - Thailand's economy should expand 1% this year and 4% in 2022, with the government set to introduce more stimulus measures and exports to remain strong, its finance minister said on Monday.

The government expects to inject about 3.7 trillion baht ($113 billion) into the economy, including a spending budget of 3.1 trillion baht and some 300 billion baht under a virus response borrowing decree, Arkhom Termpittayapaisith also told a business seminar.

"In 2021, the situation is not that good and the government has continued to introduce measures to ensure that we have money to go into the economy," he said.

Arkhom said exports, a key driver of growth, should remain competitive next year, with the baht favourable. The currency has weakened by 8% against the dollar so far this year.

"In 2022, there may be some periods that the currency will weaken or strengthen, but the trend is expected to be for the baht that is favourable for exports," he said.

Southeast Asia's second-largest economy https://www.reuters.com/article/idUSL4N2S407U contracted less than expected in the third quarter as domestic activity started to recover from the coronavirus-driven slump, and a reopening https://www.reuters.com/business/aerospace-defense/bangkok-welcomes-first-tourists-quarantine-free-holiday-2021-11-01 to more foreign visitors raised hopes for a tourism revival.

The vital tourism sector will gradually recover next year, he said, adding the sector had lost almost 2 trillion baht.

Earlier on Monday, the state planning agency forecast 200,000 foreign tourists this year and 5 million visitors next year. That compared with 40 million foreign arrivals in 2019.

The government will continue investing in infrastructure, including digital projects, Arkhom said.

Cyptocurrency trade has seen a jump in recent years and regulators have to ensure such trade is fair with minimum risks, he said. ($1 = 32.74 baht) (Reporting by Orathai Sriring, Kitiphong Thaichareon abd Satawasin Staporncharnchai Editing by Angus MacSwan)